DESC:TECHNICAL FIELD
[001] The embodiments herein generally relate to powertrain in vehicles and more particularly, to a powertrain having an engine with integral transmission unit (a power transmission unit is integrated/disposed inside the engine between a left hand side crankcase housing and a right hand side crankcase housing; and a differential unit is disposed between the right hand side crankcase housing and an end cover) in a vehicle, where the power transmission unit (gear box assembly) comprising an integrated second and fifth driving gear, a third driven gear and a fourth driven gear which are acting as dog clutches/shifter sleeves to facilitate engagement of corresponding gears based on the movement of a gear shift lever adapted to be shifted to corresponding gear position thereby eliminating the usage of synchronizers units, wherein the power transmission unit is provided with a H-gate shift pattern.

BACKGROUND
[002] Generally, a powertrain of a vehicle refers to a group of components used for generating and delivering power for driving the vehicle. The main components of the power train are engine and transmission units, where the transmission units include a clutch unit, a power transmission unit (gearbox assembly), a differential unit and other standard components as present in standard vehicle transmission. Usually in the power train having multi-cylinder engine, the engine and transmission units are assembled as separate units which requires more space and imparts more weight. The arrangement and packaging of powertrain components, in particular for integrating the power transmission unit inside the engine is complex and is one of the challenges posed to original equipment manufacturers (OEM’s).
[003] Vehicles such as quadricycle have sliding mesh transmission in which up shifting and downshifting of gears take place in sequence on a single plane, whereas vehicles like cars have synchromesh transmission in which up shifting and downshifting of gears take place in an H-gate shift arrangement which allows shifting of gears from one gear to another gear independently. For example, the driver (user) can shift to second gear from fourth gear directly without passing through the third gear. Sliding mesh transmission doesn’t allow shifting of gears directly without passing through the intermediate gears.
[004] However, synchromesh transmissions are quite costly and their implementation in vehicles such as quadricycle will increase the cost of the vehicle.
[005] Therefore, there exists a need for a powertrain having an engine with integral transmission unit in a vehicle, where the transmission unit is provided with an H-gate shift pattern. Further, there exists a need for a powertrain for a vehicle, which obviates the aforementioned drawbacks. Furthermore, there exists a need for a power transmission unit (gear box assembly) for a vehicle.

OBJECTS
[006] The principle object of an embodiment of this invention is to provide a powertrain having an engine with integral transmission unit (a power transmission unit is integrated/disposed inside the engine between a left hand side crankcase housing and a right hand side crankcase housing; and a differential unit is disposed between the right hand side crankcase housing and an end cover) in a vehicle, where the power transmission unit (gear box assembly) comprising an integrated second and fifth driving gear, a third driven gear and a fourth driven gear which are acting as dog clutches/shifter sleeves to facilitate engagement of corresponding gears based on the movement of a gear shift lever adapted to be shifted to corresponding gear position thereby eliminating the usage of synchronizers units, wherein the power transmission unit is provided with a H-gate shift pattern.
[007] Another object of an embodiment of this invention is to provide a power transmission unit for a vehicle, which comprises an integrated second and fifth driving gear, a third driven gear and a fourth driven gear which are acting as dog clutches to facilitate engagement of corresponding gears based on the movement of a gear shift lever adapted to be shifted to corresponding gear position thereby eliminating the usage of synchronizer units, wherein the power transmission unit is provided with a H-gate shift pattern that enables shifting flexibility and better shifting feeling to the driver driving the vehicle.
[008] Yet, another object of an embodiment of this invention is to provide a powertrain for a vehicle, which is compact and has less weight.
[009] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[0010] This invention is illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0011] FIG. 1 depicts an exploded view of a portion of a powertrain for a vehicle, according to an embodiment of the invention as disclosed herein;
[0012] FIG. 2 depicts a transparent perspective view of the portion of the powertrain, according to an embodiment of the invention as disclosed herein;
[0013] FIG. 3 depicts a perspective view of a portion of a transmission unit of the powertrain, according to an embodiment of the invention as disclosed herein;
[0014] FIG. 4 depicts another perspective view of the portion of the transmission unit of the powertrain, according to an embodiment of the invention as disclosed herein;
[0015] FIG. 5 depicts a perspective view of a power transmission unit of the transmission unit, according to an embodiment of the invention as disclosed herein;
[0016] FIG. 6 depicts a cross-sectional view of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0017] FIG. 7 depicts a perspective view of an input shaft of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0018] FIG. 8 depicts a perspective view of an integrated second and fifth gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0019] FIG. 9 depicts another perspective view of the integrated second and fifth gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0020] FIG. 10 depicts a cross-sectional view of the integrated second and fifth gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0021] FIG. 11 depicts a perspective view of a third driving gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0022] FIG. 12 depicts a perspective view of a fourth driving gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0023] FIG. 13 depicts a perspective view of a first driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0024] FIG. 14 depicts a perspective view of a second driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0025] FIG. 15 depicts a perspective view of a third driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0026] FIG. 16 depicts another perspective view of the third driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0027] FIG. 17 depicts a cross-sectional view of the third driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0028] FIG. 18 depicts a perspective view of a fourth driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0029] FIG. 19 depicts another perspective view of the fourth driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0030] FIG. 20 depicts a cross-sectional view of the fourth driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0031] FIG. 21 depicts a perspective view of a fifth driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0032] FIG. 22 depicts a perspective view of a reverse driven gear of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0033] FIG. 23 depicts a perspective view of a portion of the power transmission unit, where the first driven gear is in engaged position, according to an embodiment of the invention as disclosed herein;
[0034] FIG. 24 depicts a perspective view of another portion of the power transmission unit, according to an embodiment of the invention as disclosed herein;
[0035] FIG. 25 depicts a perspective view of another portion of the power transmission unit, where a fifth driven gear is in engaged position, according to an embodiment of the invention as disclosed herein;
[0036] FIG. 26 depicts a perspective view of a portion of the powertrain, where a selector cable and a shifter cable is connected to a selector lever and a shifter lever respectively, according to an embodiment of the invention as disclosed herein;
[0037] FIG. 27 depicts a perspective view of the powertrain, where a cylinder block of an engine is assembled to a crankcase of the engine, according to an embodiment of the invention as disclosed herein;
[0038] FIG. 28 depicts a cross-sectional view of the powertrain, according to an embodiment of the invention as disclosed herein;
[0039] FIG. 29 depicts another cross-sectional view of the powertrain, according to an embodiment of the invention as disclosed herein;
[0040] FIG. 30 depicts a perspective view of an end cover and a portion of a magneto unit, according to an embodiment of the invention as disclosed herein; and
[0041] FIG. 31 depicts a schematic view of a gear shift lever position layout (H-gate shift pattern) of the power transmission unit of the powertrain, according to an embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0042] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0043] The embodiments herein achieve a powertrain having an engine with integral transmission unit (a power transmission unit is integrated/disposed inside the engine between a left hand side crankcase housing and a right hand side crankcase housing; and a differential unit is disposed between the right hand side crankcase housing and an end cover) in a vehicle, where the power transmission unit (gear box assembly) comprising an integrated second and fifth driving gear, a third driven gear and a fourth driven gear which are acting as dog clutches/shifter sleeves to facilitate engagement of corresponding gears based on the movement of a gear shift lever adapted to be shifted to corresponding gear position thereby eliminating the usage of synchronizers units, wherein the power transmission unit is provided with a H-gate shift pattern. Referring now to the drawings, and more particularly to FIGS. 1 through 31, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0044] FIG. 1 depicts an exploded view of a portion of a powertrain 10 for a vehicle, according to an embodiment of the invention as disclosed herein. In an embodiment, the powertrain 10 (as shown in fig. 1, fig. 2, fig. 26, fig. 27, fig. 28 and fig. 29) includes an engine 12 (as shown in fig.27), a transmission unit 20 (as shown in fig. 1, fig. 3 and fig. 4), a magneto unit 14 (as shown in fig. 30), a clutch cover 16 (as shown in fig. 2, fig. 26, fig. 27 and fig. 29), an end cover 18 (as shown in fig. 2 and fig. 30) and may include other standard components as present in standard vehicle powertrain. For the purpose of this description and ease of understanding, the powertrain 10 is explained herein below with reference to be provided to a quadricycle. However, it is also within the scope of the invention to provide the powertrain 10 and the components of the transmission unit 20 in a two wheeled vehicle or a three wheeled vehicle or any other type of vehicle without otherwise deterring the intended function of the powertrain 10 as can be deduced from the description and corresponding drawings.
[0045] FIG. 2 depicts a transparent perspective view of the portion of the powertrain 10, according to an embodiment of the invention as disclosed herein. The engine 12 includes a cylinder block 12a (as shown in fig. 27), at least one piston 12b (as shown in fig. 28), at least one connecting rod 12c (as shown in fig. 28), at least one crankshaft 12d (as shown in fig. 29), a crankcase 12e (as shown in fig. 2) and may include other standard components as present in standard engine. In an embodiment, the engine 12 is a single cylinder engine. In another embodiment, the engine 12 is a multi-cylinder engine. The cylinder block 12a is removably connected to a right hand side crankcase housing 12r (as shown in fig. 2) and a left hand side crankcase housing 12l (as shown in fig. 2), and disposed above the crankcase 12e. The cylinder block 12a includes at least one cylinder (not shown). The cylinder (not shown) of the cylinder block 12a is adapted to receive the piston 12b. In another embodiment, the cylinder block 12a includes a plurality of cylinders (not shown). The piston 12b slides inside the cylinder (not shown) of the cylinder block 12a. The connecting rod 12c is connected to the piston 12b and the crankshaft 12d i.e., one end of the connecting rod 12c is connected with piston 12b and other end of the connecting rod 12c is connected with the crankshaft 12d. The crankshaft 12d is disposed inside the engine 12 between the right hand side crankcase housing 12r and the left hand side crankcase housing 12l. The crankshaft 12d is used to transfer the torque generated/produced by the engine 12 to the transmission unit 20. The crankcase 12e is a vertically split type crankcase, where the crankcase 12e includes a right hand side crankcase housing 12r and a left hand side crankcase housing 12l. The right hand side crankcase housing 12r and the left hand side crankcase housing 12l are removably connected to each other by using fasteners (not shown). The left hand side crankcase housing 12l includes a clutch receiving portion C adapted to receive a clutch unit 22 (as shown in fig. 29). The inner side of the right hand side crankcase housing 12r and the inner side of the left hand side crankcase housing 12l is adapted to receive a power transmission unit 100 (as shown in fig. 1 and fig. 2) of the transmission unit 20. A portion of the right hand side crankcase housing 12r and the inner side of the end cover 18 is adapted to receive of a differential unit 24 (as shown in fig. 2 and fig. 29) of the transmission unit 20, where the portion of the right hand side crankcase housing 12r is opposite to the inner side of the end cover 18.
[0046] FIG. 3 depicts a perspective view of a portion of a transmission unit 20 of the powertrain 10, according to an embodiment of the invention as disclosed herein. FIG. 4 depicts another perspective view of the portion of the transmission unit 20 of the powertrain 10, according to an embodiment of the invention as disclosed herein. In an embodiment, the transmission unit 20 is integrated inside the engine 12. In an embodiment, the transmission unit 20 includes a clutch unit 22 (as shown in fig. 3, fig. 4, and fig. 29), a power transmission unit 100 (as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 23, fig. 24, fig. 25 and fig. 29), a differential unit 24 (as shown in fig. fig. 1, fig. 2, fig. 3, fig. 4 and fig. 29) and may include other standard components as present in standard vehicle transmission unit.
[0047] The clutch unit 22 is used for engaging and disengaging the engine 12 with the power transmission unit 100. The clutch unit 22 is mounted to an input shaft 102 (as shown in fig. 29) of the power transmission unit 100 and rotatably connected to the crankshaft 12d of the engine 12 through at least one gear 12g (as shown in fig. 3 and fig. 4) adapted to be mounted to the crankshaft 12d. The clutch unit 22 is disposed to the clutch receiving portion C (as shown in fig. 1 and fig. 29) of the left hand side crankcase housing 12l between corresponding portion of the left hand side crankcase housing 12l and an inner side of the clutch cover 16.
[0048] FIG. 6 depicts a cross-sectional view of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. In an embodiment, the power transmission unit 100 includes an input shaft 102, an output shaft 104, a integrated second and fifth gear 106, a third driving gear 108, a fourth driving gear 110, a reverse driving gear 112, a first driven gear 114, a second driven gear 116, a third driven gear 118, a fourth driven gear 120, a fifth driven gear 122, a reverse driven gear 124, a reverse idler gear 125i (as shown in fig. 5), a reverse idler shaft 125s (as shown in fig. 5), a first shift fork 126, a second shift fork 128, a third shift fork 130, a first shift rail 132, a second shift rail 134, a rail-end 135, a selector and shifter unit 136, a selector lever 138, a shifter lever 140, a selector cable 142, a shifter cable 144, a gear shift lever (not shown) and may include other standard components as present in standard vehicle power transmission unit (gear box assembly). In an embodiment, the power transmission unit 100 is integrated/disposed inside the engine 12 between the inner side of the right hand side crankcase housing 12r and the inner side of the left hand side crankcase housing 12l i.e., the components of the power transmission unit 100 such the input shaft 102, the output shaft 104, the integrated second and fifth gear 106, the third driving gear 108, the fourth driving gear 110, the reverse driving gear 112, the first driven gear 114, the second driven gear 116, the third driven gear 118, the fourth driven gear 120, the fifth driven gear 122, the reverse driven gear 124, the reverse idler gear 125i, the reverse idler shaft 125s, the first shift fork 126, the second shift fork 128, the third shift fork 130, the first shift rail 132, the second shift rail 134, the rail-end 135, a portion of the shift and selector unit 136 and other standard components are integrated/disposed inside the engine 12 between inner side of the right hand side crankcase housing 12r and the inner side of the left hand side crankcase housing 12l. It is also within the scope of the invention to provide the aforementioned components of the power transmission unit 100 external to the engine 12. Whereas the components of the power transmission unit 100 such as the another portion of the selector and shifter unit 136, the selector lever 138, the shifter lever 140, the selector cable 142, the shifter cable 144, the gear shift lever (not shown) and other standard components are disposed external to the engine 12. In an embodiment, the power transmission unit 100 is a manual power transmission unit. In an embodiment, the power transmission unit 100 is configured to be provided with an H gate shift pattern (as shown in fig. 31).
[0049] FIG. 7 depicts a perspective view of an input shaft 102 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The input shaft 102 is rotatably connected to the crankshaft 12d of the engine 12 through the clutch unit 22. In an embodiment, the input shaft 102 is having an integrated first driving gear 102f at a predetermined position. However, it is also within the scope of the invention to provide the first driving gear 102f as a separate part mounted to the input shaft 102 without otherwise deterring the intended function of the first driving gear 102f as can be deduced from the description and corresponding drawings. The output shaft 104 is rotatably connected to the input shaft 102 of the power transmission unit 100 and the differential unit 24.
[0050] FIG. 8 depicts a perspective view of an integrated second and fifth gear 106 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. FIG. 9 depicts another perspective view of the integrated second and fifth gear 106 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. FIG. 10 depicts a cross-sectional view of the integrated second and fifth gear 106 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. In an embodiment, the integrated second and fifth gear 106 is movably connected to the input shaft 102 between the third driving gear 108 and the fourth driving gear 110. In an embodiment, the integrated second and fifth gear 106 is having a second driving gear 106a, a fifth driving gear 106b and a fork engaging portion 106c. The integrated second and fifth gear 106 acts/serves as a dog clutch to facilitate engagement of the third driving gear 108 and the fourth driving gear 110 on engagement of the gear shift lever (not shown) adapted to be shifted to a third gear position (3 represents third gear position, as shown in fig. 31) and a fourth gear position (4 represents fourth gear position, as shown in fig. 31) respectively. The second driving gear 106a of the integrated second and fifth gear 106 is movably connected to the input shaft 102. In an embodiment, the second driving gear 106a of the integrated second and fifth gear 106 is adapted to drive the second driven gear 116 and also acts/serves as a dog clutch to facilitate engagement of the third driving gear 108 on engagement of the gear shift lever (not shown) adapted to be shifted from a neutral gear position (N represents neutral gear position, as shown in fig. 31) to the third gear position (3rd gear position). In an embodiment, the second driving gear 106a of the integrated second and fifth gear 106 defines a plurality of locking elements 106d (as shown in fig. 8) transversely extending from at least one of corresponding side portion and circumference of the second driving gear 106a, and provided at a predefined angle from each other. The integrated second and fifth gear 106 moves in a direction towards the third driving gear 108 therein to enable engagement of the locking elements 106d of the second driving gear 106a of the integrated second and fifth gear 106 with corresponding locking elements 108a (as shown in fig. 11) of the third driving gear 108 thereby facilitating engagement of third driving gear 108 in response to the movement of the second shift fork 128 along a predefined direction on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the third gear position (3rd gear position). In an embodiment, each locking element 106d of the second driving gear 106a of the integrated second and fifth gear 106 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide the second driving gear 106a with any openings or cavities or other type of locking elements, and the third driving gear with protrusions or lugs or gear teeth collar or any other type of locking elements for facilitating engagement of the third driving gear 108. In an embodiment, the fifth driving gear 106b of the integrated second and fifth gear 106 is movably connected to the input shaft 102. In an embodiment, the fifth driving gear 106b of the integrated second and fifth gear 106 is adapted to drive the fifth driven gear 122 and also acts/serves as dog clutch to facilitate engagement of the fourth driving gear 110 on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the fourth gear position (4th gear position). In an embodiment, the fifth driving gear 106b of the integrated second and fifth gear 106 defines a plurality of locking elements 106e (as shown in fig. 9) transversely extending corresponding side portion of the fifth driving gear 106b, and provided at a predefined angle from each other. The integrated second and fifth gear 106 moves in a direction towards the fourth driving gear 110 therein to enable engagement of the locking elements 106e of the fifth driving gear 106b of the integrated second and fifth gear 106 with corresponding locking elements 110a (as shown in fig. 12) of the fourth driving gear 110 thereby facilitating engagement of fourth driving gear 110 in response to the movement of the second shift fork 128 along a predefined direction on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the fourth gear position (4th gear position). In an embodiment, each locking element 106e of the fifth driving gear 106b of the integrated second and fifth gear 106 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide the fifth driving gear 106b with openings or cavities or any other type of locking elements, and the fourth driving gear 110 with protrusions or dog teeth collar or lugs or any other type of locking elements for facilitating engagement of fourth driving gear 110. The fork engaging portion 106c of the integrated second and fifth gear 106 is between the second driving gear 106a and the fifth driving gear 106b. The fork engaging portion 106c of the integrated second and fifth gear 106 is adapted to receive lugs (not shown) of the second shift fork 128 therein to connect the second shift fork 128 to the integrated second and fifth gear 106. The fork engaging portion 106c of the integrated second and fifth gear 106 can be considered to be a groove.
[0051] FIG. 11 depicts a perspective view of a third driving gear 108 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The third driving gear 108 is mounted to the input shaft 102 between the first driving gear 102f and the second driving gear 106a of the integrated second and fifth gear 106. The third driving gear 108 is adapted to drive the third driven gear 118 adapted to be mounted to the output shaft 104. In an embodiment, the third driving gear 108 defines a defines a plurality of locking elements 108a corresponding to the locking elements 106d of the second driving gear 106a, where the locking elements 108a is transversely extending from corresponding side portion of the third driving gear 108, and provided at a predefined angle from each other. The locking elements 108a of the third driving gear 108 is adapted to be engaged by the locking elements 106d of the second driving gear 106a therein to facilitate engagement of the third driving gear 108 on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the third gear position (3rd gear position). In an embodiment, each locking element 108a of the third driving gear 108 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide the third driving gear 108 with cavities or openings or any other type of locking elements, and the second driving gear 106a with protrusions or lugs or dog teeth collar or any other type of locking elements for facilitating engagement of third driving gear 108.
[0052] FIG. 12 depicts a perspective view of a fourth driving gear 110 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The fourth driving gear 110 is mounted to the input shaft 102 between the fifth driving gear 106b of the integrated second and fifth gear 106 and the reverse driving gear 112. The fourth driving gear 110 is adapted to drive the fourth driven gear 120 mounted to the output shaft 104. In an embodiment, the fourth driving gear 110 defines a plurality of locking elements 110a corresponding to the locking elements 106e of the fifth driving gear 106b, where the locking elements 110 is transversely extending from corresponding side portion of the fourth driving gear 110, and provided at a predefined angle from each other. The locking elements 110a of the fourth driving gear 110 is adapted to be engaged by the locking elements 106e of the fifth driving gear 106b therein to facilitate engagement of the fourth driving gear 110 on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the fourth gear position (4th gear position). In an embodiment, each locking element 110a of the fourth driving gear 110 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide the fourth driving gear 110 with openings or cavities or any other type of locking elements, and the fifth driving gear 106b with protrusions or dog teeth collar or lugs or any other type of locking elements for facilitating engagement of fourth driving gear 110.
[0053] The reverse driving gear 112 is mounted to the input shaft 102 adjacent to the fourth driving gear 110. The reverse driving gear 112 is adapted to drive the reverse driven gear 124 through the reverse idler gear 125i adapted to be mounted to the reverse idler shaft 125s.
[0054] FIG. 13 depicts a perspective view of a first driven gear 114 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The first driven gear 114 is mounted to the output shaft 104 and rotatably connected to the first driving gear 102f, where the first driven gear 114 is driven by the first driving gear 102f. In an embodiment, the first driven gear 114 defines a plurality of locking elements 114a adapted to be engaged by corresponding first locking elements 118a (as shown in fig 15) of the third driven gear 118 therein to facilitate engagement of the first driven gear 114 on engagement of the gear shift lever (not shown) adapted to be shifted to a first gear position (1 represents first gear position, as shown in fig. 31). In an embodiment, each locking element 114a of the first driven gear 114 is at least one of an opening and a cavity. It is also within the scope of the invention to provide the first driven gear 114 with protrusions or dog teeth collar or lugs or any other type of locking elements, and corresponding side portion of the third driven gear 118 with opening or cavity or any other type of locking elements for facilitating engagement of first driven gear 114.
[0055] FIG. 14 depicts a perspective view of a second driven gear 116 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The second driven gear 116 is mounted to the output shaft 104 and rotatably connected to the second driving gear 106a of the integrated second and fifth gear 106. The second driven gear 116 is driven by the second driving gear 106a. In an embodiment, the second driven gear 116 defines a plurality of locking elements 116a adapted to be engaged by corresponding second locking elements 118b (as shown in fig. 15 and fig. 16) of the third driven gear 116 therein to facilitate engagement of the second driven gear 116 on engagement of the gear shift lever (not shown) adapted to be shifted to a second gear position (2 represents second gear position, as shown in fig. 31). In an embodiment, each locking element 116a of the second driven gear 116 is at least one of an opening and a cavity. It is also within the scope of the invention to provide the second driven gear 116 with protrusions or dog teeth collar or lugs or any other type of locking elements, and corresponding another side portion of the third driven gear 116 with openings or cavity or any other type of locking elements for facilitating engagement of the second driven gear 116.
[0056] FIG. 15 depicts a perspective view of a third driven gear 118 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. FIG. 16 depicts another perspective view of the third driven gear 118 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. FIG. 17 depicts a cross-sectional view of the third driven gear 118 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The third driven gear 118 is movably connected to the output shaft 104 between the first driven gear 114 and the second driven gear 116, and rotatably connected to the third driving gear 108. The third driven gear 118 is driven by the third driving gear 108 and also acts/serves as dog clutch to facilitate engagement of the first driven gear 114 and the second driven gear 116 on engagement of the gear shift lever (not shown) adapted to be shifted to the first gear position (1st gear position) and the second gear position (2nd gear position) respectively. In an embodiment, the third driven gear 118 defines a plurality of first locking elements 118a corresponding to the locking elements 114a of the first driven gear 114, a plurality of second locking elements 118b corresponding to the locking elements 116a of the second driven gear 116, and a fork engaging portion 118c. In an embodiment, the plurality of first locking elements 118a is transversely extending from corresponding side portion of the third driven gear 118, and provided at a predefined angle from each other. In an embodiment, third driven gear 118 moves in a direction towards the first driven gear 114 therein to enable engagement of the plurality of first locking elements 118a of the third driven gear 118 with corresponding locking elements 114a of the first driven gear 114 thereby facilitating engagement of the first driven gear 114 in response to the movement of the first shift fork 126 along a predefined direction on engagement of the gear shift lever (not shown) adapted to be shifted to the first gear position (1st gear position). In an embodiment, each first locking element 118a of the third driven gear 118 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide corresponding portion of the third driven gear 118 with openings or cavities or any other type of locking elements, and the first driven gear 114 with protrusions or lugs or dog teeth collar or any other type of locking elements for facilitating engagement of the first driven gear 114. In an embodiment, the plurality of second locking elements 118b is transversely extending from corresponding another side portion of the third driven gear 118, and provided at a predefined angle from each other. In an embodiment, third driven gear 118 moves in a direction towards the second driven gear 116 therein to enable engagement of the plurality of second locking elements 118b of the third driven gear 118 with corresponding locking elements 116a of the second driven gear 116 thereby facilitating engagement of the second driven gear 116 in response to the movement of the first shift fork 126 along a predefined direction on engagement of the gear shift lever (not shown) adapted to be shifted to the second gear position (2nd gear position). In an embodiment, each second locking element 118b of the third driven gear 118 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide the corresponding another portion of the third driven gear 118 with openings or cavities or any other type of locking elements for facilitating engagement of the third driven gear 118. The fork engaging portion 118c is between the first locking elements 118a and the second locking elements 118b. The fork engaging portion 118c of the third driven gear 118 is adapted to receive lugs (not shown) of the first shift fork 126 therein to connect the first shift fork 126 to the third driven gear 118. The fork engaging portion 118c of the third driven gear 118 can be considered to be groove.
[0057] FIG. 18 depicts a perspective view of a fourth driven gear 120 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. FIG. 19 depicts another perspective view of the fourth driven gear 120 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. FIG. 20 depicts a cross-sectional view of the fourth driven gear 120 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The fourth driven gear 120 is movably connected to the output shaft 104 between the fifth driven gear 122 and the reverse driven gear 124, and rotatably connected to the fourth driving gear 110. The fourth driven gear 120 is driven by the fourth driving gear 110 and also acts/serves as dog clutch to facilitate engagement of the fifth driven gear 122 and the reverse driven gear 124 on engagement of the gear shift lever (not shown) adapted to be shifted to a fifth gear position (5 represents fifth gear position, as shown in fig. 31) and a reverse gear position (R represents reverse gear position, as shown in fig. 31) respectively. In an embodiment, the fourth driven gear 120 defines a plurality of first locking elements 120a, a plurality of second locking elements 120b and a fork engaging portion 120c. In an embodiment, the plurality of first locking elements 120a transversely extends from corresponding side portion of the fourth driven gear 120, and provided at a predefined angle from each other. In an embodiment, the fourth driven gear 120 moves in a direction towards the fifth driven gear 122 therein to enable engagement of the plurality of first locking elements 120a of the fourth driven gear 120 with corresponding locking elements 122a (as shown in fig. 21) of the fifth driven gear 122 thereby facilitating engagement of the fifth driven gear 122 in response to the movement of the third shift fork 130 along a predefined direction on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the fifth gear position (5th gear position). In an embodiment, each first locking element 120a of the fourth driven gear 120 is at least one of a dog teeth collar and a lug. It is also within the scope of the invention to provide corresponding side portion of the fourth driven gear 120 with openings or cavities or any other type of locking elements, and the fifth driven gear 122 with protrusions or lugs or dog teeth collar or any other type of locking element for facilitating engagement of the fifth driven gear 122. The fork engaging portion 120c is between the first locking elements 120a and the second locking elements 120b of the fourth driven gear 120. The fork engaging portion 120c of the fourth driven gear 120 is adapted to receive the lugs (not shown) of the third shift fork 130 therein to connect the third shift fork 130 to the fourth driven gear 120. The fork engaging portion 120c of the fourth driven gear 120 can be considered to be groove.
[0058] FIG. 21 depicts a perspective view of a fifth driven gear 122 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The fifth driven gear 122 is mounted to the output shaft 104 between the second driven gear 116 and the fourth driven gear 120, and rotatably connected to the fifth driving gear 106b of the integrated second and fifth gear 106. The fifth driven gear 122 is driven by the fifth driving gear 106b of the integrated second and fifth gear 106. In an embodiment, the fifth driven gear 122 defines a plurality of locking elements 122a corresponding to the first locking elements 120a of the fourth driven gear 120, where the plurality of plurality of locking elements 122a is transversely extending from corresponding side portion of the fifth driven gear 122. In an embodiment, the plurality of locking elements 122a of the fifth driven gear 122 is adapted to be engaged by corresponding first locking elements 120a of the fourth driven gear 120 therein to facilitate engagement of the fifth driven gear 122 on engagement of the gear shift lever (not shown) adapted to be shifted from the neutral gear position (N gear position) to the fifth gear position (5th gear position). In an embodiment, each locking element 122a of the fifth driven gear 122 is at least one of dog teeth collar and a lug. It is also within the scope of the invention to provide the fifth driven gear 122 with opening or cavities or any other type of locking elements, and corresponding side portion of the fourth driven gear 120 with protrusions or lugs or dog teeth collar or any other type of locking elements for facilitating engagement of fifth driven gear 122.
[0059] FIG. 22 depicts a perspective view of a reverse driven gear 124 of the power transmission unit 100, according to an embodiment of the invention as disclosed herein. The reverse driven gear 124 is mounted to the output shaft 104 adjacent to the fourth driven gear 120 and rotatably connected to the reverse driving gear 112 through the reverse idler gear 125i. The reverse driven gear 124 is driven by the reverse driving gear 112. In an embodiment, the reverse driven gear 124 defines a plurality of locking elements 124a corresponding to the second locking elements 120b of the fourth driven gear 120. In an embodiment, the plurality of locking elements 124a of the reverse driven gear 124 is adapted to be engaged by corresponding second locking elements 120b of the fourth driven gear therein to facilitate engagement of the reverse driven gear 124 on engagement of the gear shift lever (not shown) adapted to shifted from the neutral gear position (N gear position) to the fifth gear position (5th gear position). In an embodiment, each locking element 124a of the reverse driven gear 124 is at least one of an opening and a cavity. It is also within the scope of the invention to provide the reverse driven gear 124 with protrusions or lugs or dog teeth collar or any other type of locking elements, and corresponding another side portion of the fourth driven gear 120 with openings or cavities or any other type of locking elements for engagement of the reverse driven gear 124.
[0060] The reverse idler gear 125i is mounted to the reverse idler shaft 125s, and rotatably connected to the reverse driving gear 112 and the reverse driven gear 124. The reverse idler gear 125i is mounted to the reverse idler shaft 125s.
[0061] The first shift fork 126 is used to move the third driven gear 118 in at least one of a direction towards the first driven gear 114, and a direction towards the second driven gear 116 therein to facilitate engagement of first driven gear 114 and the second driven gear 116 respectively in response to engagement of a shift finger 136f (as shown in fig. 3 fig. 4 and fig. 5) of the selector and shifter unit 136 with a finger receiving portion 126f (as shown in fig. 23) of a rail end 126r (as shown in fig. 23) of the first shift fork 126 followed by the movement of the a selector and shifter rod 136r (as shown in fig. 3) of the selector and shifter unit 136 in the forward direction y-axis and the reverse direction along y-axis respectively, where y-axis is parallel to a longitudinal axis of the power transmission unit 100. The first shift fork 126 is mounted to the first shift rail 132 and connected to the fork engaging portion 118c of the third driven gear 118. The first shift fork 126 includes a rail-end 126r, a plurality of lugs (not shown) and may include other standard portions as present in standard shift fork. The rail-end 126r of the first shift fork 126 defines a finger receiving portion 126f adapted to receive the shift finger 136f of the selector and shifter unit 136 in response to turning of the selector and shifter rod 136r of the selector and shifter unit 136 in a predefined direction along y-axis therein to move the first shift fork 126 along with the first shift rail 132 in at least one of the forward direction along y-axis and reverse direction along y-axis thereby moving third driven gear 118 towards the first driven gear 114 and the second driven gear 116 respectively thereby facilitating engagement of the first driven gear 114 and the second driven gear 116 respectively in response to the movement of the selector and shifter rod 136r in the forward direction along y-axis and the reverse direction along y-axis respectively. The lugs (not shown) of the first shift fork 126 is connected to the fork engaging portion 118c of the third driven gear 118.
[0062] The second shift fork 128 is used to move the integrated second and fifth gear 106 in at least one of a direction towards the third driving gear 108, and a direction towards the fourth driving gear 110 therein to facilitate engagement of the third driving gear 108 and the fourth driving gear 110 respectively in response to engagement of the shift finger 136f of the selector and shifter unit 136 with a finger receiving portion 128f (as shown in fig. 24) of a rail-end 128r (as shown in fig. 24) of the second shift fork 128 followed by the movement of the selector and shifter rod 136r of the selector and shifter unit 136 in the forward direction along y-axis and the reverse direction along y-axis respectively. The second shift fork 128 is mounted to the second shift rail 134 and connected to the fork engaging portion 106c of the integrated second and fifth gear 106. The second shift fork 128 includes a rail-end 128r, a plurality of lugs (not shown) and may include other standard portions as present in standard shift fork. The rail-end 128r of the second shift fork 128 defines a finger receiving portion 128f adapted to receive the shift finger 136f of the selector and shifter unit 136 in response to turning of the selector and shifter rod 136r of the selector and shifter unit 136 in a predefined direction along y-axis therein to move the second shift fork 128 along with the first shift rail 132 in at least one of the forward direction along y-axis and reverse direction along y-axis thereby moving integrated second and fifth gear 106 towards the third driving gear 108 and the fourth driving gear 110 respectively thereby facilitating engagement of the third driving gear 108 and the fourth driving gear 110 respectively in response to the movement of the selector and shifter rod 136r in the forward direction along y-axis and the reverse direction along y-axis respectively. The rail-end 128r of the second shift fork 128 can be separate part connected to the second shift fork 128. The rail-end 128r of the second shift fork 128 can also be an integral part of the second shift fork 128. The lugs (not shown) of the second shift fork 128 is connected to the fork engaging portion 106c of the integrated second and fifth gear 106.
[0063] The third shift fork 130 is used to move the fourth driven gear 120 in at least one of a direction towards the fifth driven gear 122 and a direction towards the reverse driven gear 124 therein to facilitate engagement of the fifth driven gear 122 and the reverse driven gear 124 respectively in response to engagement of the shift finger 136f of the selector and shifter unit 136 with a finger receiving portion 135f (as shown in fig. 25) of a rail-end 135 (as shown in fig. 25) followed by the movement of the selector and shifter rod 136r of the selector and shifter unit 136 in the forward direction along y-axis and the reverse direction along y-axis respectively. The third shift fork 130 is mounted to the second shift rail 134 and connected to the fork engaging portion 120c of the fourth driven gear 120. The third shift fork 130 includes a plurality of lugs (not shown) and may include other standard portions as present in standard shift fork. The rail-end 135 is connected to the second shift rail 134 at a predetermined distance from the third shift fork 130. The rail-end 135 defines a finger receiving portion 135f (as shown in fig. 25) adapted to receive the shift finger 136f of the selector and shifter unit 136 in response to turning of the selector and shifter rod 136r of the selector and shifter unit 136 in a predefined direction along y-axis therein to move the second shift rail 134 along with the first shift fork 126 in at least one of the forward direction along y-axis and reverse direction along y-axis thereby moving fourth driven gear 120 towards the fifth driven gear 122 and the reverse driven gear 124 respectively thereby facilitating engagement of the fifth driven gear 122 and the reverse driven gear 124 respectively in response to the movement of the selector and shifter rod 136r in the forward direction along y-axis and the reverse direction along y-axis respectively. The lugs (not shown) of the third shift fork 130 is connected to the fork engaging portion 120c of the fourth driven gear 120.
[0064] The first shift rail 132 is used for mounting the first shift fork 126 and the second shift fork 128 at a predetermined position from each other. The second shift rail 134 is used for mounting the third shift fork 130 and the rail-end 135 at a predetermined position from each other. The rail-end 135 is connected to the second shift rail 134.
[0065] The selector and shifter unit 136 is used for selecting/engaging corresponding shift fork (126, 128 and 130) in response to turning of the selector lever 142 in corresponding direction along y-axis, and shifting/moving corresponding shift fork (126, 128 and 130) in the forward and reverse direction along y-axis thereby facilitating engagement of corresponding gears (114, 116, 108, 110, 122 and 124) in response to the movement of the shifter lever 144 along a predefined direction. The selector and shifter unit 136 includes a selector and shifter rod 136r, at least one shift finger 136f and may include other standard components as present in standard selector and shifter assembly. The shift finger 136f of selector and shifter unit 136 is used for selecting corresponding shift forks (126, 128 and 135) in response to the turning of the selector lever 138 along a predefined direction. The selector and shifter rod 136r is used for shifting corresponding shift forks (126, 128 and 135) in response to movement of the shifter cable 1444 along the predefined direction.
[0066] The selector lever 138 is used for turning the selector and shifter rod 136r of the selector and shifter unit 136 in a predefined direction along y-axis in response to the movement of the selector cable 142. The shifter lever 140 is used for moving the selector and shifter rod 136r of the selector and shifter unit 136 in the forward or reverse direction along y-axis in response to the movement of the shifter cable 142.
[0067] One end of the selector cable 142 is directly or indirectly connected to the gear shifter lever (not shown) and another end of the selector cable 142 is directly or indirectly connected to the selector lever 138. The selector cable 142 is used for turning the selector lever 138 in predefined direction therein to turn the selector and shifter rod 136r of the selector and shifter unit 136 in a predefined direction along y-axis in response to engagement of the gear shift lever (not shown) adapted to be shifted to corresponding gear position (N, 1, 2, 3, 4, 5 and R).
[0068] One end of the shifter cable 144 is directly or indirectly connected to the gear shifter lever (not shown) and another end of the shifter cable 144 is directly or indirectly connected to the shifter lever 140. The shifter cable 144 is used for moving the shifter lever 140 in the predefined direction therein to move the selector and shifter rod 136r of the selector and shifter unit 136 in the forward or reverse direction along y-axis in response to the engagement of the gear shift lever (not shown) adapted to be shifted to corresponding gear position (N, 1, 2, 3, 4, 5 and R).
[0069] The gear shift lever (not shown) is engaged by the driver driving the vehicle to selectively move the gear shift lever (not shown) between various gear positions (N, 1, 2, 3, 4, 5 and R) therein to facilitate engagement of corresponding gear (114, 116, 108, 110,122 and 124) that are required for various driving conditions of the vehicle.
[0070] The differential unit 24 is used to allow the drive wheels (not shown) to turn at different revolutions per minute (rpm) while receiving power from the engine 12. The differential unit 24 includes a shaft (not shown) and other standard components of the differential unit 24. In an embodiment, the differential unit 24 is disposed a portion of the right hand side crankcase housing 12r and the inner side of the end cover 18. The differential unit 24 is rotatably connected to the output shaft 104 of the power transmission unit 100 through a plurality of gears G, where one gear G is mounted to output shaft 104 of the power transmission unit 100 and another gear G is mounted to the shaft (not shown) of the differential unit 24. The shaft (not shown) of the differential unit 24 is driven by the output shaft 104 of the power transmission unit 100, and the shaft (not shown) of the differential unit 24 drives the driveshaft (not shown) to transfer the motion to the wheels (not shown) the vehicle. The driveshaft (not shown) is driven by the shaft (not shown) of the differential unit 24 to drive the wheels (not shown) of the vehicle.
[0071] The magneto unit 14 is disposed between corresponding portion of the right hand side crankcase housing 12r and the inner side of end cover 18. The clutch cover 16 is removably connected to the left hand side crankcase housing 12l therein to cover the clutch unit 22. The end cover 18 is removably connected to the right hand side crankcase housing 12r therein to cover the differential unit 24 and the magneto unit 14.
[0072] Therefore, a compact powertrain 10 having an engine 12 with integrated transmission unit 20 is provided for a vehicle.
[0073] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
,CLAIMS:CLAIMS
We claim,
1. A power train 10 for a vehicle, said powertrain 10 comprising:
an engine 12 comprising, a crankcase 12e having a right hand side crankcase housing 12r, and a left hand side crankcase housing 12l adapted to be removably connected to the right hand side crankcase housing 12r; a crankshaft 12d; and a cylinder block 12a adapted to be removably connected to the right hand side crankcase housing 12r and the left hand side crankcase housing 12l, and disposed above said crankcase 12e, where said cylinder block 12a having at least one cylinder; and
a transmission unit 20 adapted to be integrated inside said engine 12, said transmission unit 20 comprising, a clutch unit 22; a differential unit 24; and a power transmission unit 100, said power transmission unit 100 comprising,
an input shaft 102 having an integrated first driving gear 102f, said input shaft 102 adapted to be rotatably connected to the crankshaft 102d of said engine 12 through said clutch unit 22;
an output shaft 104 adapted to be rotatably connected to the input shaft 102 and said differential unit 24;
a first driven gear 114 adapted to be mounted to said output shaft 104 and rotatably connected to the first driving gear 102f, said first driven gear 114 defining a plurality of locking elements 114a;
an integrated second and fifth gear 106 adapted to be movably connected to said input shaft 102, said integrated second and fifth gear 106 having a second driving gear 106a defining a plurality of locking elements 106d; a fifth driving gear 106b defining a plurality of locking elements 106e; and a fork engaging portion 106c between the second driving gear 106a and the fifth driving gear 106b;
a second driven gear 116 adapted to be mounted to said output shaft 104 and rotatably connected to the second driving gear 106a, said second driven gear 116 defining a plurality of locking elements 116a;
a third driving gear 108 adapted to be mounted to said input shaft 102 between the first driving gear 102f and the second driving gear 106a, said third driving gear 108 defining a plurality of locking elements 108a corresponding to the locking elements 106d of the second driving gear 106a;
a third driven gear 118 adapted to be movably connected to said output shaft 104 between said first driven gear 114 and said second driven gear 116, and rotatably connected to said third driving gear 108, said third driven gear 118 defining a plurality of first locking elements 118a corresponding to the locking elements 114a of said first driven gear 114, a plurality of second locking elements 118b corresponding to the locking elements 116a of said second driven gear 116, and a fork engaging portion 118c between the first locking elements 118a and the second locking elements 118b;
a fourth driving gear 110 adapted to be mounted to said input shaft 102, said fourth driving gear 110 defining a plurality of locking elements 110a corresponding to the locking elements 106e of the fifth driving gear 106b;
a fourth driven gear 120 adapted to be movably connected to said output shaft 104 and rotatably connected to said fourth driving gear 110, said fourth driven gear 120 defining a plurality of first locking elements 120a, a plurality of second locking elements 120b and a fork engaging portion 120c;
a fifth driven gear 122 adapted to be mounted to said output shaft 104 between said second driven gear 116 and said fourth driven gear 120, and rotatably connected to the fifth driving gear 106b, said fifth driven gear 122 defining a plurality of locking elements 122a corresponding to the first locking elements 120a of said fourth driven gear 120;
a reverse driving gear 112 adapted to be mounted to said input shaft 102;
a reverse driven gear 124 adapted to be mounted to said output shaft 104 and rotatably connected to said reverse driving gear 112, said reverse driven gear 124 defining a plurality of locking elements 124a corresponding to the second locking elements 120b of said fourth driven gear 120;
a first shift fork 126 adapted to be mounted to a first shift rail 132 and connected to the fork engaging portion 118c of said third driven gear 118;
a second shift fork 128 adapted to be mounted to the first shift rail 132 and connected to the fork engaging portion 106c of said integrated second and fifth gear 106; and
a third shift fork 130 adapted to be mounted to a second shift rail 134 and connected to the fork engaging portion 120c of said fourth driven gear 120,
wherein
said power transmission unit 100 is integrated inside said engine 12 between an inner side of the right hand side crankcase housing 12r and an inner side of the left hand side crankcase housing 12l;
said differential unit 24 is disposed between a portion of the right hand side crankcase housing 12r and an inner side of an end cover 18, where the portion of the right hand side crankcase housing 12r is opposite to the inner side of the end cover 18;
said integrated second and fifth gear 106 is adapted to be movably connected to said input shaft 102 between said third driving gear 108 and said fourth driving gear 110;
said fourth driven gear 120 is adapted to be movably connected to said output shaft 104 between said fifth driven gear 122 and said reverse driven gear 124;
said first shift fork 126 is adapted to move said third driven gear 118 in a direction towards said first driven gear 114 therein to enable engagement of the first locking elements 118a of said third driven 118 with corresponding locking elements 114a of said first driven gear 114 thereby facilitating engagement of said first driven gear 114 on engagement of a gear shift lever adapted to be shifted to a first gear position;
said first shift fork 126 is adapted to move said third driven gear 118 in a direction towards said second driven gear 116 therein to enable engagement of the second locking elements 118b of said third driven gear 118 with corresponding locking elements 116a of said second driven gear 116 thereby facilitating engagement of said second driven gear 116 on engagement of the gear shift lever adapted to be shifted to a second gear position;
said second shift fork 128 is adapted to move said integrated second and fifth gear 106 in a direction towards said third driving gear 108 therein to enable engagement of the locking elements 106d of the second driving gear 106a with corresponding locking elements 108a of said third driving gear 108 thereby facilitating engagement of said third driving gear 108 on engagement of the gear shift lever adapted to be shifted from a neutral gear position to a third gear position;
said second shift fork 128 is adapted to move said integrated second and fifth gear 106 in a direction towards said fourth driving gear 110 therein to enable engagement of the locking elements 106e of the fifth driving gear 106b with corresponding locking elements 110a of said fourth driving gear 110 thereby facilitating engagement of said fourth driving gear 110 on engagement of the gear shift lever adapted to be shifted from the neutral gear position to a fourth gear position;
said third shift fork 130 is adapted to move said fourth driven gear 120 in a direction towards said fifth driven gear 122 therein to enable engagement of the first locking elements 120a of said fourth driven gear 120 with corresponding locking elements 122a of said fifth driven gear 122 thereby facilitating engagement of said fifth driven gear 122 on engagement of the gear shift lever adapted to be shifted from the neutral gear position to a fifth gear position; and
said third shift fork 130 is adapted to move said fourth driven gear 120 in a direction towards said reverse driven gear 124 therein to enable engagement of the second locking elements 120b of said fourth driven gear 120 with corresponding locking elements 124a of said reverse driven gear 124 thereby facilitating engagement of reverse driven gear 124 on engagement of the gear shift lever adapted to be shifted from the neutral gear position to a reverse gear position.

2. The powertrain 10 as claimed in claim 1, wherein the left hand side crankcase housing 12l of said engine 12 defining a clutch receiving portion C adapted to receive said clutch unit 22.

3. The powertrain 10 as claimed in claim 1, further comprising a clutch cover 16 adapted to be removably connected to the left hand side crankcase housing 12l therein to cover said clutch unit 22, where the clutch unit 22 is disposed between an inner side of the clutch cover 16 and corresponding portion of the left hand side crankcase housing 12l.

4. The powertrain 10 as claimed in claim 1, further comprising a magneto unit 14 adapted to be disposed between a portion of the right hand side crankcase housing 12r and the inner side of the end cover 18, where the magneto unit 14 is adjacent to said differential unit 24.

5. The powertrain 10 as claimed in claim 1, wherein the end cover 18 is adapted to be removably connected to the right hand side crankcase housing 12r therein to cover said differential unit 24 and the magnet unit 14.
6. The powertrain 10 as claimed in claim 1, wherein said power transmission unit 100 is configured to be provided with a H-gate shift pattern.

7. The powertrain 10 as claimed in claim 1, wherein each of said first locking element 118a of said third driven gear 118 is at least one of a dog teeth collar and a lug, where each of said first locking element 118a of said third driven gear 118 is adapted to be transversely extending from corresponding side portion of said third driven gear 118, and provided at a predefined angle from each other.

8. The powertrain 10 as claimed in claim 1, wherein each of said locking element 114a of said first driven gear 114 is at least one of an opening and a cavity.

9. The powertrain 10 as claimed in claim 1, wherein each of said second locking element 118b of said third driven gear 118 is least one of a dog teeth collar and a lug, wherein each of said second locking element 118b of said third driven gear 118 is adapted to be transversely extending from corresponding another side portion of said third driven gear 118, and provided at a predefined angle from each other.

10. The powertrain 10 as claimed in claim 1, wherein each of said locking element 116a of said second driven gear 116 is at least one of an opening and a cavity.

11. The powertrain 10 as claimed in claim 1, wherein each of said locking element 106d of said second driving gear 106a is at least one of a dog teeth collar and a lug, wherein each of said locking element 106d of said second driving gear 106a is adapted to be transversely extending from at least one of corresponding side portion of said second driven gear 106a and a circumference portion of the second driving gear 106a, and provided at a predefined angle from each other.

12. The powertrain 10 as claimed in claim 1, wherein each of said locking element 108a of said third driving gear 108 is at least one of a dog teeth collar and a lug, where each of said locking element 108a of said third driving gear 108 is transversely extending from corresponding side portion of said third driving gear 108, and provided at a predefined angle from each other.

13. The powertrain 10 as claimed in claim 1, wherein each of said locking element 106e of said fifth driving gear 106b is at least one of a dog teeth collar and a lug, where each of said locking element 106e of said fifth driving gear 106b is transversely extending from corresponding side portion of the fifth driving gear 106b, and provided at a predefined angle from each other.

14. The powertrain 10 as claimed in claim 1, wherein each of said locking element 110a of said fourth driving gear 110 is at least one of a dog teeth collar and a lug, where each of said locking element 110a of said fourth driving gear 110 is transversely extending from corresponding side portion of said fourth driving gear 110, and provided at a predefined angle from each other.

15. The powertrain 10 as claimed in claim 1, wherein each of said first locking element 120a of said fourth driven gear 120 is at least one of a dog teeth collar and a lug, where each of said first locking element 120a of said fourth driven gear 120 is transversely extending from corresponding side portion of said fourth driven gear 120, and provided at a predefined angle from each other.

16. The powertrain 10 as claimed in claim 1, wherein each of said locking element of said fifth driven gear 122 is at least one of a dog teeth collar and a lug, where each of said locking element of said fifth driven gear 122 is transversely extending from corresponding side portion of said fifth driven gear 122, and provided at a predefined angle from each other.

17. The powertrain 10 as claimed in claim 1, wherein each of said second locking element 120b of said fourth driven gear 120 is at least one of a dog teeth collar and a lug, where each of said second locking element 120b of said fourth driven gear 120 is transversely extending from corresponding another side portion of said fourth driven gear 120, and provided at a predefined angle from each other.

18. The powertrain 10 as claimed in claim 1, each of said locking element 124 of said reverse driven gear 124 is at least one of an opening and a cavity.

19. The powertrain 10 as claimed in claim 1, wherein the vehicle is at least a quadricycle.

20. A power transmission unit 100 for a vehicle, said power transmission unit 100 comprising:
an input shaft 102 having an integrated first driving gear 102f;
an output shaft 104 adapted to be rotatably connected to said input shaft 102;
a first driven gear 114 adapted to be mounted to said output shaft 104 and rotatably connected to the first driving gear 102f, said first driven gear 114 defining a plurality of locking elements 114a;
an integrated second and fifth gear 106 adapted to be movably connected to said input shaft 102, said integrated second and fifth gear 106 having a second driving gear 106a defining a plurality of locking elements 106d; a fifth driving gear 106b defining a plurality of locking elements 106e; and a fork engaging portion 106c between the second driving gear 106a and the fifth driving gear 106b;
a second driven gear 116 adapted to be mounted to said output shaft 104 and rotatably connected to the second driving gear 106a, said second driven gear 116 defining a plurality of locking elements 116a;
a third driving gear 108 adapted to be mounted to said input shaft 102 between the first driving gear 102f and the second driving gear 106a, said third driving gear 108 defining a plurality of locking elements 108a corresponding to the locking elements 106d of the second driving gear 106a;
a third driven gear 118 adapted to be movably connected to said output shaft 104 between said first driven gear 114 and said second driven gear 116, and rotatably connected to said third driving gear 108, said third driven gear 118 defining a plurality of first locking elements118a corresponding to the locking elements 114a of said first driven gear 114, a plurality of second locking elements 118b corresponding to the locking elements 116a of said second driven gear 116, and a fork engaging portion 118c between the first locking elements 118a and the second locking elements 118b;
a fourth driving gear 110 adapted to be mounted to said input shaft 102, said fourth driving gear 110 defining a plurality of locking elements 110a corresponding to the locking elements 106e of the fifth driving gear 106b;
a fourth driven gear 120 adapted to be movably connected to said output shaft 104 and rotatably connected to said fourth driving gear 110, said fourth driven gear 120 defining a plurality of first locking elements 120a, a plurality of second locking elements 120b and a fork engaging portion 120c;
a fifth driven gear 122 adapted to be mounted to said output shaft 104 between said second driven gear 116 and said fourth driven gear 120, and rotatably connected to the fifth driving gear 106b, said fifth driven gear 122 defining a plurality of locking elements 122a corresponding to the first locking elements 120a of said fourth driven gear 120;
a reverse driving gear 112 adapted to be mounted to said input shaft 102;
a reverse driven gear 124 adapted to be mounted to said output shaft 104 and rotatably connected to said reverse driving gear 112, said reverse driven gear 124 defining a plurality of locking elements 124a corresponding to the second locking elements 120b of said fourth driven gear 120;
a first shift fork 126 adapted to be mounted to a first shift rail 132 and connected to the fork engaging portion 118c of said third driven gear 118;
a second shift fork 128 adapted to be mounted to the first shift rail 132 and connected to the fork engaging portion 106c of said integrated second and fifth gear 106; and
a third shift fork 130 adapted to be mounted to a second shift rail 134 and connected to the fork engaging portion 120c of said fourth driven gear 120,
wherein
said integrated second and fifth gear 106 is adapted to be movably connected to said input shaft 102 between said third driving gear 108 and said fourth driving gear 110;
said fourth driven gear 120 is adapted to be movably connected to said output shaft 104 between said fifth driven gear 122 and said reverse driven gear 124;
said first shift fork 126 is adapted to move said third driven gear 118 in a direction towards said first driven gear 114 therein to enable engagement of the first locking elements 118a of said third driven 118 with corresponding locking elements 114a of said first driven gear 114 thereby facilitating engagement of said first driven gear 114 on engagement of a gear shift lever adapted to be shifted to a first gear position;
said first shift fork 126 is adapted to move said third driven gear 118 in a direction towards said second driven gear 116 therein to enable engagement of the second locking elements 118b of said third driven gear 118 with corresponding locking elements 116a of said second driven gear 116 thereby facilitating engagement of said second driven gear 116 on engagement of the gear shift lever adapted to be shifted to a second gear position;
said second shift fork 128 is adapted to move said integrated second and fifth gear 106 in a direction towards said third driving gear 108 therein to enable engagement of the locking elements 106d of the second driving gear 106a with corresponding locking elements 108a of said third driving gear 108 thereby facilitating engagement of said third driving gear 108 on engagement of the gear shift lever adapted to be shifted from a neutral gear position to a third gear position;
said second shift fork 128 is adapted to move said integrated second and fifth gear 106 in a direction towards said fourth driving gear 110 therein to enable engagement of the locking elements 106e of the fifth driving gear 106b with corresponding locking elements 110a of said fourth driving gear 110 thereby facilitating engagement of said fourth driving gear 110 on engagement of the gear shift lever adapted to be shifted from the neutral gear position to a fourth gear position;
said third shift fork 130 is adapted to move said fourth driven gear 120 in a direction towards said fifth driven gear 122 therein to enable engagement of the first locking elements 120a of said fourth driven gear 120 with corresponding locking elements 122a of said fifth driven gear 122 thereby facilitating engagement of said fifth driven gear 122 on engagement of the gear shift lever adapted to be shifted from the neutral gear position to a fifth gear position; and
said third shift fork 130 is adapted to move said fourth driven gear 120 in a direction towards said reverse driven gear 124 therein to enable engagement of the second locking elements 120b of said fourth driven gear 120 with corresponding locking elements 124a of said reverse driven gear 124 thereby facilitating engagement of reverse driven gear 124 on engagement of the gear shift lever adapted to be shifted from the neutral gear position to a reverse gear position.

21. The power transmission unit 100 as claimed in claim 20, wherein each of said first locking element 118a of said third driven gear 118 is at least one of a dog teeth collar and a lug, where each of said first locking element 118a of said third driven gear 118 is adapted to be transversely extending from corresponding side portion of said third driven gear 118, and provided at a predefined angle from each other.

22. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element 114a of said first driven gear 114 is at least one of an opening and a cavity.

23. The power transmission unit 100 as claimed in claim 20, wherein each of said second locking element 118b of said third driven gear 118 is least one of a dog teeth collar and a lug, wherein each of said second locking element 118b of said third driven gear 118 is adapted to be transversely extending from corresponding another side portion of said third driven gear 118, and provided at a predefined angle from each other.

24. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element 116a of said second driven gear 116 is at least one of an opening and a cavity.

25. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element 106d of said second driving gear 106a is at least one of a dog teeth collar and a lug, wherein each of said locking element 106d of said second driving gear 106a is adapted to be transversely extending from at least one of corresponding side portion of said second driven gear 106a and a circumference portion of the second driving gear 106a, and provided at a predefined angle from each other.

26. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element 108a of said third driving gear 108 is at least one of a dog teeth collar and a lug, where each of said locking element 108a of said third driving gear 108 is transversely extending from corresponding side portion of said third driving gear 108, and provided at a predefined angle from each other.

27. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element 106e of said fifth driving gear 106b is at least one of a dog teeth collar and a lug, where each of said locking element 106e of said fifth driving gear 106b is transversely extending from corresponding side portion of the fifth driving gear 106b, and provided at a predefined angle from each other.

28. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element 110a of said fourth driving gear 110 is at least one of a dog teeth collar and a lug, where each of said locking element 110a of said fourth driving gear 110 is transversely extending from corresponding side portion of said fourth driving gear 110, and provided at a predefined angle from each other.

29. The power transmission unit 100 as claimed in claim 20, wherein each of said first locking element 120a of said fourth driven gear 120 is at least one of a dog teeth collar and a lug, where each of said first locking element 120a of said fourth driven gear 120 is transversely extending from corresponding side portion of said fourth driven gear 120, and provided at a predefined angle from each other.

30. The power transmission unit 100 as claimed in claim 20, wherein each of said locking element of said fifth driven gear 122 is at least one of a dog teeth collar and a lug, where each of said locking element of said fifth driven gear 122 is transversely extending from corresponding side portion of said fifth driven gear 122, and provided at a predefined angle from each other.

31. The power transmission unit 100 as claimed in claim 20, wherein each of said second locking element 120b of said fourth driven gear 120 is at least one of a dog teeth collar and a lug, where each of said second locking element 120b of said fourth driven gear 120 is transversely extending from corresponding another side portion of said fourth driven gear 120, and provided at a predefined angle from each other.

32. The power transmission unit 100 as claimed in claim 20, each of said locking element 124 of said reverse driven gear 124 is at least one of an opening and a cavity.

33. The power transmission unit 100 as claimed in claim 20 is configured to be provided with a H-gate shift pattern.

34. The power transmission unit 100 as claimed in claim 20 is configured to be integrated inside an engine 12 between a right hand side crankcase housing 12r and a left hand side crankcase housing 12l.

35. The power transmission unit 100 as claimed in claim 20 is configured to be provided external to the engine 12.

36. The power transmission unit 100 as claimed in claim, wherein said output shaft 104 is rotatably connected to a differential unit 24 through a plurality of gears G, where one gear G is adapted to be mounted to said output shaft 104 of said power transmission unit 100, and another gear G is adapted to be mounted to a shaft of the differential unit 24 and rotatably connected to the gear G mounted to said output shaft 104 of said power transmission unit 100.

Dated: 31st May 2017 Signature:
Somashekar Ramakrishna