Description:TECHNICAL FIELD
[001] The present subject matter relates to a vehicle, more particularly, packaging of an oil chamber in a transmission system of the vehicle.
BACKGROUND
[002] Typically, in a saddle type vehicle, an electric motor is commonly located in a rear wheel of the vehicle. In such an electric vehicle, a powertrain casing act as a swing arm for the vehicle. In some vehicles, the electric motor is mid mounted and is disposed on a central portion of a frame assembly of the vehicle.
[003] In conventional electric vehicles, a powertrain casing and a cover transmission is constructed to store oil required for lubrication of components in the powertrain, which includes a gear drive and shafts. However, as volume of the casing and the transmission cover is filled with oil, sealing of the assembly becomes critical as each corner may cause leaking of oil. To ensure sealing a gasket can be provided or increase number of bolts, which increases the number of components and wastage of oil.
[004] Further, due to higher volume of oil within the powertrain casing, churning losses are higher, inherently affecting efficiency of the vehicle. Also, a chain drive that connects the motor and the rear wheel, is also required to be wet due to the oil filled within the powertrain casing and transmission cover. As such, dry chain-drive option is not present in the conventional electric vehicle.
[005] Moreover, components like sprocket are not required to be dipped in oil constantly as this may cause unwanted resistance for the sprocket movement because of oil, which adds onto the churning losses of the vehicle.
[006] Additionally, oil present within the casing adds onto unsprung mass of the vehicle, which worsens the structural and vibrational strength of the electric vehicle, which is undesirable. Moreover, during maintenance where powertrain casing is required to be opened, oil wastage will be more as higher volume of oil is needed to be scrapped. As an example, if an operator is required to tighten the belt or replace the sprocket, the operator has to open the cover and then replace, which leads to also wastage of oil.
[007] In view of the above, there is a need for a swing arm structure for the saddle-type electric vehicle which packages an oil chamber, and also addresses one or more limitations stated above.
SUMMARY
[008] The present subject matter provides a transmission system of a vehicle provided with an electric motor and a motor casing, and an oil chamber being formed between the motor casing and an outer transmission casing of a transmission casing of the transmission system.
[009] As per an aspect of the present invention, a transmission system of a vehicle comprising a transmission casing and a motor casing. The transmission casing is configured to secure and cover one or more reduction gears of the transmission system. The motor casing is configured to cover an electric motor of the vehicle. The electric motor comprising a motor shaft, wherein a motive force is transferred from the motor shaft to the one or more reduction gears for providing a motion to a rear wheel of the vehicle. The transmission casing comprising an inner transmission casing and an outer transmission casing. The motor casing and the outer transmission casing being configured to form an oil chamber.
[010] As per an embodiment, the oil chamber is adapted to encompass the one or more reduction gears for lubrication.
[011] As per another embodiment, the outer transmission casing comprising a first portion and a second portion. The motor casing comprising a first extension and the first portion of the outer transmission casing comprising a second extension.
[012] As per another embodiment, the oil chamber is formed by abutting the first extension of the motor casing with the second extension of the first portion of the outer transmission casing.
[013] As per another embodiment, the first extension of the motor casing and the second extension of the first portion of the outer transmission casing is abutted through one or more mounting points, and the mounting provisions are disposed on an outer periphery of the motor casing.
[014] As per another embodiment, the oil chamber comprising a base portion and one or more supporting walls, and the oil chamber is configured to conform to a shape and profile of the first portion and the motor casing.
[015] As per another embodiment, the first extension extending downwardly from one or more peripheral edges of the motor casing. Furthermore, the second extension extending upwardly from an outer periphery of the first portion of the outer transmission casing.
[016] As per another embodiment, the outer transmission cover and the inner transmission casing is connected through a plurality of attachment provisions, and the plurality of attachment provisions are disposed on outer periphery of the outer transmission cover.
[017] As per another embodiment, the outer transmission casing comprising an outer cover, and the outer cover is configured to provide spill proof assembly of the oil chamber by means of one of a sealing agent and a sealing member.
[018] As per another aspect of the present invention, a vehicle comprising a frame assembly and a transmission system. The frame assembly comprising an intermediate frame assembly. The intermediate frame assembly comprising one or more receiving portions for receiving and supporting the transmission system of the vehicle. The transmission system of a vehicle comprising a transmission casing and a motor casing. The transmission casing is configured to secure and cover one or more reduction gears of the transmission system. The motor casing is configured to cover an electric motor of the vehicle. The electric motor comprising a motor shaft, wherein a motive force is transferred from the motor shaft to the one or more reduction gears for providing a motion to a rear wheel of the vehicle. The transmission casing comprising an inner transmission casing and an outer transmission casing. The motor casing and the outer transmission casing being configured to form an oil chamber.
[019] As per an embodiment, the intermediate frame assembly is configured to provide a mounting provision for a side stand assembly of the vehicle.
[020] As per another embodiment, the oil chamber is adapted to encompass the one or more reduction gears for lubrication.
[021] As per another embodiment, the intermediate frame assembly comprising one or more receiving portions for receiving and accommodating the transmission system.
[022] As per another embodiment, the intermediate frame assembly comprising a plurality of legs for supporting the transmission system.
[023] As per another embodiment, the intermediate frame assembly is mounted below a seat assembly of the vehicle.
[024] As per another embodiment, the intermediate frame assembly comprising one or more connecting members for distributing load of the transmission system uniformly across the plurality of legs.
[025] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
BRIEF DESCRIPT ION OF THE DRAWINGS
[026] The present invention is described with reference to figures. This invention is implementable in two-wheeled vehicles, three wheeled, and multi wheeled vehicles. The same numbers are used throughout the drawings to reference like features and components. Further, the inventive features of the invention are outlined in the appended claims.
[027] Figure 1 illustrates a top view of a transmission system of a vehicle, in accordance with an embodiment of the present subject matter.
[028] Figure 2 illustrates a perspective view of the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.
[029] Figure 3 illustrates an exploded view of the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.
[030] Figure 4 illustrates an exploded view of an oil chamber formed in the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.
[031] Figure 5 illustrates an exploded view of the transmission system, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION OF THE DRAWINGS

[032] Exemplary embodiments are described with reference to the accompanying drawings. Wherever convenient, the same reference numbers are used throughout the drawings to refer to the same or like parts. While examples and features of disclosed principles are described herein, modifications, adaptations, and other implementations are possible without departing from the scope of the disclosed embodiments. It is intended that the following detailed description be considered as exemplary only, with the true scope being indicated by the following claims.
[033] The present subject matter is further described with reference to accompanying figures. It should be noted that the description and figures merely illustrate the principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[034] The foregoing disclosure is not intended to limit the present disclosure to the precise forms or particular fields of use disclosed. As such, it is contemplated that various alternate embodiments and/or modifications to the present disclosure, whether explicitly described or implied herein, are possible in light of the disclosure. Having thus described embodiments of the present disclosure, a person of ordinary skill in the art will recognize that changes may be made in form and detail without departing from the scope of the present disclosure. Thus, the present disclosure is limited only by the claims.
[035] Additionally, all numerical terms, such as, but not limited to, “first”, “second”, “third”, “primary”, “secondary”, “main” or any other ordinary and/or numerical terms, should also be taken only as identifiers, to assist the reader's understanding of the various elements, embodiments, variations and/or modifications of the present disclosure, and may not create any limitations, particularly as to the order, or preference, of any element, embodiment, variation and/or modification relative to, or over, another element, embodiment, variation and/or modification.
[036] Hence it is an object of the present invention to provide packaging of an oil chamber between an outer transmission casing and a motor casing of transmission system of a vehicle and also to overcome other related problems known in the art as explained in the background problem.
[037] It is also an object of the present invention to reduce the amount of oil required to accommodate a larger volume area.
[038] It is also an object of the present invention to prevent leakage of oil from the oil chamber and thereby prevent leakage of oil from the oil chamber.
[039] It is also an object of the present invention to provide ease of assembly, packaging, and serviceability of the oil chamber without using additional parts or complex tools.
[040] It is also an object of the present invention to provide uniform distribution of load of the transmission system along the frame assembly of the vehicle.
[041] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[042] Figure 1 illustrates a top view of a transmission system (100) of a vehicle, in accordance with an embodiment of the present subject matter. A vehicle comprises a frame assembly (not shown) which acts as askeletal structure of the vehicle. In one embodiment, the vehicle is a two wheeled vehicle, a three wheeled vehicle, or a multi wheeled vehicle. In another embodiment, the vehicle is an electric vehicle or a hybrid electric vehicle. In one embodiment, the vehicle comprising a transmission system (100). The transmission system (100) also functions as a swing arm assembly of the vehicle which transfers motive force from a power unit of the vehicle to one or more wheels of the vehicle for driving the vehicle. In one embodiment, the transmission system (100) comprising a motor casing (102) and a transmission casing (104). The motor casing (102) and the transmission casing (104) are abutted to each other to form the transmission system (100). The transmission casing (104) comprising a transmission assembly (106) which is movably connected to a rear wheel shaft (108) of a rear wheel of the vehicle. The transmission assembly (106) transfers the power from the power unit to the rear wheel of the vehicle.
[043] Figure 2 illustrates a perspective view of the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. In one embodiment, the frame assembly (not shown) of the vehicle comprising an intermediate frame assembly (200). The intermediate frame assembly (200) is configured to receive and accommodate the transmission system (100) of the vehicle. In one embodiment, the intermediate frame assembly (200) comprising a one or more receiving portions (202) for receiving and accommodating the transmission system (100). The intermediate frame assembly (200) comprising a plurality of legs (200a) for supporting the load of the transmission system (100). In one embodiment, the intermediate frame assembly (200) is mounted below a seat assembly of the vehicle and is disposed in a middle portion of the vehicle when viewed along a longitudinal axis of the vehicle. The intermediate frame assembly (200) comprising one or more connecting members (204, 206) for distributing the load of the transmission system (100) uniformly across the plurality of legs (200a). The intermediate frame assembly (200) comprising a side stand assembly (208) extending outwardly from one of the plurality of legs (200a) of the intermediate frame assembly (200). In another embodiment, a first receiving portion of the one or more receiving portions (202) receives the motor casing (102) and a second receiving portion of the one or more receiving portions (202) receives the transmission casing (104). The plurality of legs (200a) uniformly receives the load of the transmission system (100) and distributes the load across the intermediate frame assembly (200) and the side stand assembly (208). In another embodiment, the transmission casing (104) comprising an inner transmission casing (104a) and an outer transmission casing (104b). In one embodiment, the outer transmission casing (104b) being configured to secure and protect the transmission assembly (106) disposed in the transmission system (100). In another embodiment, the inner transmission casing (104a) being abutted with the motor casing (102).
[044] Figure 3 illustrates an exploded view of the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. In one embodiment, the motor casing (102) comprising an electric motor (300). The electric motor (300) is disposed and secured inside the motor casing (102). The motor casing (102) is fixedly attached to the inner transmission casing (104a) thorough one or more fasteners. The transmission assembly (106) disposed in the inner transmission casing (104a) comprising one or more reduction gears (304). The one or more reduction gears (304) comprising a driver gear and a driven gear disposed on a conveyor unit (306a). In one embodiment, the conveyor unit (306a) is one of a belt or a chain for transmission of motive force. In one embodiment, a driver gear of the one or more reduction gears (304) is operably connected to a motor shaft (302) of the electric motor (300). In another embodiment, a driven gear of the one or more reduction gears (304) is operably connected to the rear wheel shaft (108) of the vehicle. In one embodiment, the outer transmission casing (104b) is connected to the inner transmission casing (104a) through a sealing gasket (306) and the sealing gasket (306) reduces vibration, noise in the transmission system and prevents accidental damage to the transmission assembly (106) of the transmission system (100).
[045] Figure 4 illustrates an exploded view of an oil chamber (400) formed in the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. Figure 5 illustrates an exploded view of the transmission system (100), in accordance with an embodiment of the present subject matter. For brevity, figures 4 and 5 shall be discussed together. In one embodiment, the outer transmission casing (104b) comprising a first portion (104ba) and a second portion (104bb). In another embodiment, an oil chamber (400) is formed between the outer transmission casing (104b) and the motor casing (102). In one embodiment, the motor casing (102) comprising a first extension (410). In another embodiment, the first portion (104ba) of the outer transmission casing (104b) comprising a second extension (408). In an embodiment, the oil chamber (400) is formed by abutting the first extension (410) of the motor casing (102) with the second extension (408) of the first portion (104ba) of the outer transmission casing (104b). In an exemplary embodiment, the first extension (410) and the second extension (408) provides an encasing and forms a space for deposition and formation of the oil chamber (400).
[046] In another embodiment, the first extension (410) of the motor casing (102) and the second extension (408) of the first portion (104ba) of the outer transmission casing (104b) are abutted through one or more mounting points (400a). In one embodiment, the one or more mounting provisions (400a) are disposed on an outer periphery of the motor casing (102). In on embodiment, the first extension (410) extending downwardly from one or more peripheral edges of the motor casing (102). In another embodiment, the second extension (408) extending upwardly from an outer periphery of the first portion (104ba) of the outer transmission casing (104b).
[047] In one embodiment, the oil chamber (400) comprising a base portion (500) and one or more supporting walls (500a). The oil chamber (400) is configured to conform to a shape and profile of the first portion (104ba) and the motor casing (102). In an exemplary embodiment, when the shape and profile of the motor casing (102) and the outer transmission casing (104b) is circular, then the oil chamber (400) also has a circular profile. In another embodiment, when the shape and profile of the motor casing (102) and the outer transmission casing (104b) is rectangular, then the oil chamber (400) also has a rectangular profile. In another embodiment, the base portion (500) is configured to accommodate and receive oil in the oil chamber (400) and thereby provide a designated volume for accommodating the oil. In another embodiment, the one or more supporting walls (500a) is configured to extend upwardly from the base portion (500). In another embodiment, the one or more supporting walls (500a) extends up to the motor casing (102) and the one or more supporting walls (500a) abuts with the motor casing (102). In another embodiment, the base portion (500) comprising a first stepped portion (502a) and a second stepped portion (502b) configured for receiving the motor shaft (302), the driver gear of the one or more reduction gears (304) and the conveyor unit (306a). In another embodiment, the outer transmission cover (104b) and the inner transmission casing (104a) are connected through a plurality of attachment provisions (103). Further the plurality of attachment provisions (103) are disposed on outer periphery of the outer transmission cover (104b). In another embodiment, the outer transmission casing (104b) comprising an outer cover (406). The outer cover (406) is configured to provide spill proof assembly of the oil chamber (400) by means of one of a sealing agent and a sealing member. In one embodiment, the oil chamber (400) being adapted to encompass the one or more reduction gears (304) for lubrication.
[048] Various embodiments of the invention provides a transmission system of a vehicle provided with an electric motor and a motor casing, and an oil chamber being formed between the motor casing and an outer transmission casing of a transmission casing of the transmission system.
[049] The present invention is a transmission system of a vehicle comprising a transmission casing and a motor casing. The transmission casing is configured to secure and cover one or more reduction gears of the transmission system. The motor casing is configured to cover an electric motor of the vehicle. The electric motor comprising a motor shaft, wherein a motive force is transferred from the motor shaft to the one or more reduction gears for providing a motion to a rear wheel of the vehicle. The transmission casing comprising an inner transmission casing and an outer transmission casing. The motor casing and the outer transmission casing being configured to form an oil chamber.
[050] The present claimed invention solves the technical problem of leakage of oil from conventional oil chambers and thereby requiring frequent oil changes and refilling.
[051] Specifically, the oil chamber formed between the outer transmission casing and the motor casing reduces the volume required for the oil to be filled without disrupting the existing function of the transmission system and thereby reduces the amount of oil to be used for filling the oil chamber and in turn reduces overall weight of the vehicle.
[052] Additionally, the present invention eliminates the requirement of usage of long and thick sealants and thereby reduces the part count and overall weight of the transmission system.
[053] Furthermore, the presence of first extension and the second extension eliminates requirement of additional supporting walls and thereby provides a leakproof configuration of oil from the oil chamber and also prevents use of complex tools for assembly of the oil chamber.
[054] The present invention also provides advantages of ease of serviceability and assembly of the oil chamber by just removing or unfastening the fasteners between the motor casing and the first portion of the outer transmission casing of the transmission system.
[055] In light of the above-mentioned advantages and the technical advancements provided by the disclosed transmission system of a vehicle provided with an electric motor and a motor casing, and an oil chamber being formed between the motor casing and an outer transmission casing of a transmission casing of the transmission system, the claimed invention as discussed above is not routine, conventional, or well understood in the art, as the claimed invention enable the following solutions to the existing problems in conventional technologies.
[056] Furthermore, a person skilled in the art would not be motivated to design a transmission system of a vehicle provided with an electric motor and a motor casing, and an oil chamber being formed between the motor casing and an outer transmission casing of a transmission casing of the transmission system.
[057] While the present invention has been shown and described with reference to the foregoing preferred embodiments, it will be apparent to those skilled in the art that changes in form, connection, and detail may be made therein without departing from the spirit and scope of the invention.

Reference Numerals:



100 transmission system
102 motor casing
103 plurality of attachment provisions
104 transmission casing
104a inner transmission casing
104b outer transmission casing
104ba first portion
104bb second portion
106 transmission assembly
108 wheel shaft
200 intermediate frame assembly
200a plurality of legs
202 one or more receiving portions
204, 206 one or more connecting members
208 side stand assembly
300 electric motor
302 motor shaft
304 one or more reduction gears
306 sealing gasket
306a one or more conveyor unit
400 oil chamber
400a one or more mounting points
406 outer cover
408 second extension
410 first extension
500 base portion
500a one or more supporting walls
502a first stepped portion
502b second stepped portion
, Claims:I/We claim:
1. A transmission system (100) of a vehicle, said transmission system comprising:
a transmission casing (104), said transmission casing (104) being configured to secure and cover one or more reduction gears (304) of said transmission system (100);
a motor casing (102), said motor casing (102) being configured to cover an electric motor (300) of said vehicle;
wherein said electric motor (300) comprising a motor shaft (302), wherein a motive force is transferred from said motor shaft (302) to said one or more reduction gears (304) for providing a motion to a rear wheel of said vehicle;
wherein said transmission casing (104) comprising an inner transmission casing (104a) and an outer transmission casing (104b);
wherein said motor casing (102) and said outer transmission casing (104b) being configured to form an oil chamber (400).
2. The transmission system (100) as claimed in claim 1, wherein said oil chamber (400) being adapted to encompass said one or more reduction gears (304) for lubrication.
3. The transmission system (100) as claimed in claim 1, wherein said outer transmission casing (104b) comprising a first portion (104ba) and a second portion (104bb).
4. The transmission system (100) as claimed in claim 1, wherein said motor casing (102) comprising a first extension (410) and said first portion (104ba) of said outer transmission casing (104b) comprising a second extension (408).
5. The transmission system (100) as claimed in claim 1, wherein said oil chamber (400) being formed by abutting said first extension (410) of said motor casing (102) with said second extension (408) of said first portion (104ba) of said outer transmission casing (104b).
6. The transmission system (100) as claimed in claim 4, wherein said first extension (410) of said motor casing (102) and said second extension (408) of said first portion (104ba) of said outer transmission casing (104b) being abutted through one or more mounting points (400a), wherein said one or more mounting provisions (400a) being disposed on an outer periphery of said motor casing (102).
7. The transmission system (100) as claimed in claim 1, wherein said oil chamber (400) comprising a base portion (500) and one or more supporting walls (500a), wherein said oil chamber (400) being configured to conform to a shape and profile of said first portion (104ba) and said motor casing (102).
8. The transmission system (100) as claimed in claim 3, wherein said first extension (410) extending downwardly from one or more peripheral edges of said motor casing (102).
9. The transmission system (100) as claimed in claim 3, wherein said second extension (408) extending upwardly from an outer periphery of said first portion (104ba) of said outer transmission casing (104b).
10. The transmission system (100) as claimed in claim 1, wherein said outer transmission cover (104b) and said inner transmission casing (104a) being connected through a plurality of attachment provisions (103), said plurality of attachment provisions (103) being disposed on outer periphery of said outer transmission cover (104b).
11. The transmission system (100) as claimed in claim 1, wherein said outer transmission casing (104b) comprising an outer cover (406), said outer cover (406) being configured to provide spill proof assembly of said oil chamber (400) by means of one of a sealing agent and a sealing member.
12. A vehicle comprising:
a frame assembly, said frame assembly comprising an intermediate frame assembly (200);
a transmission system (100);
wherein said intermediate frame assembly (200) comprising one or more receiving portions (202) for receiving and supporting said transmission system (100) of said vehicle;
wherein said transmission system (100) comprising:
a transmission casing (104), said transmission casing (104) being configured to secure and cover one or more reduction gears (304) of said transmission system (100);
a motor casing (102), said motor casing (102) being configured to cover an electric motor (300) of said vehicle;
wherein said electric motor (300) comprising a motor shaft (302), wherein a motive force is transferred from said motor shaft (302) to said one or more reduction gears (304) for providing a motion to a rear wheel of said vehicle;
wherein said transmission casing (104) comprising an inner transmission casing (104) and an outer transmission casing (104b);
wherein said motor casing (102) and said outer transmission casing (104b) being configured to form an oil chamber (400).
13. The vehicle as claimed in claim 12, wherein said intermediate frame assembly (200) being configured to provide a mounting provision for a side stand assembly (208) of said vehicle.
14. The vehicle as claimed in claim 12, wherein said oil chamber (400) being adapted to encompass said one or more reduction gears (304) for lubrication.
15. The vehicle as claimed in claim 13, wherein said intermediate frame assembly (200) comprising one or more receiving portions (202) for receiving and accommodating said transmission system (100).
16. The vehicle as claimed in claim 13, wherein said intermediate frame assembly (200) comprising a plurality of legs (200a) for supporting said transmission system (100).
17. The vehicle as claimed in claim 13, wherein said intermediate frame assembly (200) being mounted below a seat assembly of said vehicle.
18. The vehicle as claimed in claim 13, wherein said intermediate frame assembly (200) comprising one or more connecting members (204, 206) for distributing load of said transmission system (100) uniformly across said plurality of legs (200a).