FIELD OF INVENTION:
[001] The present subject matter described herein, relates to gear shifting system of manual gear transmission system of a vehicle and, in particular, to single cable 5 gear shift system having an electric motor to select gears upon rotation of knob and movement of gear shift pedal manually.
BACKGROUND AND PRIOR ART:
[002] Gear shift system is an integral part of manual and semi-automatic transmission which enable driver to shift gear as per requirement during driving of 10 the vehicle. In the automatic transmission, I shape pattern for gear shifting is followed. Generally, H shape gear shifting pattern is present in the manual transmission mode. Both, I shape and H shape gear shifting pattern are restricted in their movement beyond specific direction.
[003] The conventional automatic transmission has an I-shaped shift pattern, in 15 which not only the individual ranges of parking (abbreviated hereinafter as "P"), reverse ("R"), neutral ("N") and drive ("D") ranges but also a second range (abbreviated hereinafter as "S") and a low range ("L") as modes for engine braking in uphill running are arranged in series. But these systems are fully automatic and only knob has to move in the indicated range to put the vehicle in 20 forward, reverse, neutral, and stop condition. These systems are costly for low budget vehicles. When the vehicle is in forward gear position, the vehicle moves according to the accelerator and goes beyond the control of the user like in manual gear systems. In the manual gear system, the user changes the gears for comfort and control driving of the vehicle. Even the vehicle does not move beyond its 25 threshold speed in a particular gear.
[004] Fig. 1 illustrates conventional manual gear shift system for selecting and shifting the gears in the vehicle. The conventional manual gear shift system 100 has gear box 101, gear knob 102, Gear Shift Lever Assembly (GSLA) 104, and
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gear boot 106. Conventionally, the gear knob 102 moves in H pattern to select the required gears in the gear box 101. Driver engages and disengages the gear by giving effort on the gear knob 102 of the GSLA 104. The driver applies the force on the gear knob 102 for engaging and disengaging the gear. Shifting mechanism of conventional gear is very common and person skilled in the art knows how the 5 gears are selected and shifted in the gear box. Therefore, detailed description of the gear shifting mechanism in the conventional gear shift system is not provided in the present description to avoid ambiguity and bring clarity in the present subject matter.
[005] Fig. 2 illustrates existing H pattern for selection of gears in the manual 10 gear transmission. In the fig. 2, the selection H pattern 200 requires more space for selection of low speed gear and high speed gears (fifth and reverse gear) in the transmission system. The selection H pattern 200 has first gear selection 201, second gear selection 202, third gear selection 203, fourth gear selection 204, fifth gear selection 205 and reverse gear selection 206. In total selection H pattern 200 15 requires three lanes for selection of gears which occupies lot of space in the passenger cabin.
[006] Problems in the art: In manual transmission of H pattern, the shift device allows the driver to select a gear as per the speed of the vehicle and, furthermore, provides an operating feel when the driver selects the gear. Therefore, the driver 20 feels the selection feeling on his/her hand and this feeling varies from vehicle to vehicle. Further, the selection process for low shift gear and fifth and reverse gear shift takes time.
[007] Further, the driver has to remember the H pattern of gear shifting which creates problem some time. The two shift and selection cables are required in the 25 present manual transmission system which occupies more space. Further, the space is required for selection of gears in H pattern in passenger cabin.
[008] Another problem in the conventional gear shift system, length of lever ratio affects the shifting smoothness and stroke in the vehicle. Therefore, length of the lever is decided as per the size of the vehicle. It becomes cumbersome to 30
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change the length of the lever every time when a new model of vehicle has to be launched.
[009] Another problem in the conventional gear shift system is that the driver feels shifting of gear as bad and good. While shifting first, second, and reverse gear, driver feels shifting strokes as high as compare to high gears and 5th gear. 5 Further, shifting of gears creates noise while engaging and disengaging with gears in the gear box. While selecting the gears, the selection creates noise during disengaging and engaging of gears.
[0010] Major disadvantage with the conventional gear shift system is that the driver has to put lot of manual efforts for selecting and shifting the gears. For 10 example, in the big vehicles more human efforts are required to shift the gears. Specifically, during heavy traffic conditions, the driver changes the gear frequently which irritates the driver and driving comfort also decreases. Further, the frequent change in the gears creates fatigue for the driver.
[0011] In view of the above, it is beneficial to have a gear shift system that 15 reduces the manual efforts for shifting the gears in manual transmission. Therefore, a simple and inexpensive gear shift system for shifting the gears in the manual transmission of the vehicle is required.
OBJECTS OF THE INVENTION:
[0012] The principal objective of the present invention is to provide an electric 20 gear shift system for selecting gears in gear box of vehicle.
[0013] Another object of the present subject matter is to provide single cable gear shift tower for shifting gears in the gear box of the vehicle.
[0014] Another object of the present invention is to provide a Single Cable Gear Shift System (SCGSS) having an electric motor and controller for selecting gears 25 in the gearbox.
[0015] Another object of the present invention is to provide a gear shift pedal having I direction movement for shifting the gears.
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[0016] Another object of the present invention is to provide a controller in the SCGSS for providing low and fifth and reverse gear selecting signals to the electric motor for selecting the gears by moving the select lever.
[0017] Another object of the present invention is to provide a SCGSS having electric motor for selecting gears and a gear shift pedal for shifting the selected 5 gears in the gear box.
[0018] Yet another object of the present invention is to provide a Single Cable Gear Shift System (SCGSS) for reducing manual efforts in the manual gear selection.
[0019] Yet another object of the present invention is to provide a Single Cable 10 Gear Shift System (SCGSS) which requires less space for selecting gears in the passenger cabin.
SUMMARY OF THE INVENTION:
[0020] The subject matter disclosed herein relates to a single cable gear shift system for selecting and shifting gears in gearbox of vehicle. The single cable 15 gear shift system has only gear shift cable. Further, the requirement of the gear select cable has been eliminated from the manual transmission system. The present single cable gear shift system includes a rotating knob connected with gear shift pedal in Gear Shift Lever Assembly (GSLA), a controller, a selection electric motor, select lever, and gear shift tower. The rotating knob is provided 20 over the gear shift pedal. The rotating knob has upper rotating part and lower fixed part. The lower fixed part is joined with the upper portion of the gear shift pedal. The upper rotating part rotates in clockwise and anti-clockwise directions for selection of low and high gears. The upper rotating part of the knob has a pair of sleeves for actuating or pressing selection switches. Upon rotation of the upper 25 rotating part of the knob, the pair of sleeves pushes the gear selection switch and sends corresponding signal to the controller connected with the rotating knob via wires. The selection electric motor has a shaft that is connected with select lever of the shift tower. The selection electric motor moves the select lever of the shift
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tower in selection direction of low shift gears and fifth and reverse gear. Upon receiving the gear selection signal from the controller, the selection electric motor moves the select lever for selection of selected gear. The select lever is moved towards lever of selected gear shift rail. The gear shift pedal moves in forward and backward direction for shifting of selected gear by pushing the shift lever for 5 shifting of selected gear shift rail. The gear shift pedal is connected with gear shift cable which transfers the force of the forward and backward movement of the gear shift pedal to the shift tower and moves the select lever for shifting of gears in the gear box.
[0021] In order to further understand the characteristics and technical contents of 10 the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] It is to be noted, however, that the appended drawings illustrate only 15 typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same 20 numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0023] Fig. 1 illustrates conventional manual gear shift system for selecting and 25 shifting the gears in the vehicle;
[0024] Fig. 2 illustrates existing H pattern for selection of gears in the manual gear transmission system;
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[0025] Fig. 3 illustrates present I pattern for selection of gears in the manual gear transmission system, in accordance with an embodiment of the present subject matter;
[0026] Fig. 4 illustrates Single Cable Gear Shift System (SCGSS) with controller, an electric motor, gear shift lever assembly, gear shift tower, and gear 5 select lever for selecting and shifting gears in the manual gear transmission system, in accordance with an embodiment of the present subject matter;
[0027] Fig. 5 illustrates circuit diagram of the controller with the electric motor for selection of gears, in accordance with an embodiment of the present subject matter; and 10
[0028] Fig. 6 illustrates detailed diagram of rotating knob for actuating selection switch for selection of gears, in accordance with an embodiment of the present subject matter.
[0029] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from 15 the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0030] The subject matter disclosed herein relates to a single cable gear shift 20 system for selecting and shifting gears in gearbox of vehicle. The single cable gear shift system has only gear shift cable. Further, the requirement of the gear select cable has been eliminated from the manual transmission system. The present single cable gear shift system includes a rotating knob connected with gear shift pedal in Gear Shift Lever Assembly (GSLA), a controller, a selection 25 electric motor, select lever, and gear shift tower. The rotating knob is provided over the gear shift pedal. The rotating knob has upper rotating part and lower fixed part. The lower fixed part is joined with the upper portion of the gear shift pedal. The upper rotating part rotates in clockwise and anti-clockwise directions
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for selection of low and high gears. The upper rotating part of the knob has a pair of sleeves for actuating or pressing selection switches. Upon rotation of the upper rotating part of the knob, the pair of sleeves pushes the gear selection switch and sends corresponding signal to the controller connected with the rotating knob via wires. The selection electric motor has a shaft that is connected with select lever 5 of the shift tower. The selection electric motor moves the select lever of the shift tower in selection direction of low shift gears and fifth and reverse gear. Upon receiving the gear selection signal from the controller, the selection electric motor moves the select lever for selection of selected gear. The select lever is moved towards lever of selected gear shift rail. The gear shift pedal moves in forward and 10 backward direction for shifting of selected gear by pushing the shift lever for shifting of selected gear shift rail. The gear shift pedal is connected with gear shift cable which transfers the force of the forward and backward movement of the gear shift pedal to the shift tower and moves the select lever for shifting of gears in the gear box. 15
[0031] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those 20 skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the 25 concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the 30
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following description when considered in connection with the accompanying figures.
[0032] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject 5 matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0033] Fig. 3 illustrates I pattern for selection of gears in the manual gear transmission system, in accordance with an embodiment of the present subject 10 matter. In the present system, the gear shift pedal moves in forward and backward direction for shifting of gears. In reference to gear selection H pattern, the present gear shift pedal moves in direction for selection of third and fourth gear only. By moving the gear shift pedal in forward and backward direction, the third and fourth gears are selected and shifted. The selection of third and fourth gear is 15 similar to existing manual transmission system. Further, the first, the second, the fifth, and the reverse gear are selected by rotation of gear knob as explained in figure 4 and 5.
[0034] Fig. 4 illustrates Single Cable Gear Shift System (SCGSS) with controller, an electric motor, gear shift lever assembly, gear shift tower, and gear 20 select lever for selecting and shifting gears in the manual gear transmission system, in accordance with an embodiment of the present subject matter. The single cable gear shift system 400 has only gear shift cable 407. In the present system, requirement of the gear select cable has been eliminated from the manual transmission system. The present single cable gear shift system 400 is a 25 combination of Gear Shift Lever Assembly (GSLA) 403, gear shift tower 409, gear select lever 410 and selection electric motor 406. The single cable gear shift system 400 includes a rotating knob 401 connected with the GSLA 403, a controller 404, a selection electric motor 406, gear select lever 410, and gear shift tower 409. The GSLA 403 has gear shift pedal 403a and a rotating knob 401. The 30
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rotating knob 401 is provided on upper part of the gear shift pedal 403a. The gear shift pedal 403a is connected with gear shift cable 407 which transfers the force from the movement of the gear shift pedal to gear shift tower 409.
[0035] The rotating knob 401 has upper rotating part and lower fixed part. The lower fixed part is joined with the upper portion of the gear shift pedal 403a. The 5 upper rotating part rotates in clockwise and anti-clockwise directions for selection of low gears, such as first and second gear, and high gears, such as fifth and reverse gear. The upper rotating part of the knob has a pair of sleeves for actuating or pressing selection switches. The selection switches are provided at left and right hand side of the upper portion of the gears shift pedal 403a inside the lower 10 fixed part of the knob 401. The pair of sleeves is provide on the upper rotating part to push the switches for selection of gears (detailed explanation is provided in the fig. 6) Upon rotation of the upper rotating part of the knob, the pair of sleeves pushes the gear selection switch and sends corresponding signal to the controller 404 connected with the rotating knob 401 via wires 405. The controller 404 sends 15 the gear selection signal to the selection electric motor 406.
[0036] The selection electric motor 406 has a vertical cylinder shaft 406a that is connected with the select lever 410 of the shift tower 409. The select lever 410 is pivoted in the gearbox thorough shift tower 409 to allow movement as per the selection electric motor 406. Further, the select lever is fixed in the direction of 20 shift tower 409 for applying force to shift the gears in the gear box. The selection electric motor 406 moves the select lever 410 of the shift tower 409 in direction for selection of low shift gears, such as first and second. Similarly, the selection electric motor 406 moves the select lever 410 of the shift tower 409 in direction for selection of the fifth the and reverse gear. In the neutral position, the select 25 lever 410 is in direction for selection and shifting of gears, such as third and fourth gear.
[0037] Upon receiving the gear selection signal from the controller 404, the selection electric motor 406 moves the select lever 410 for selection of selected gear. The select lever 410 is moved towards lever of selected gear shift rail. For 30
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example, while selecting the first gear, the rotating knob 401 rotates in counter clockwise direction for actuating the low gear selection switch. The signal of low gear selection switches is received by the controller 404 and the controller sends the signal to the selection electric motor 406. The selection electric motor 406 moves the select lever 410 by the shaft 406a in direction of low gear. Upon 5 movement, the select lever 410 is in direction of lever of low gear shift rail. Once the selection is complete, the gear shift pedal 403a moves in forward direction for shifting of first gear shift rail. The force applied on the gear shift pedal transfers through the gear shift cable 407 to the shift tower 409. Similarly, other gears can be selected and shifted. 10
[0038] The gear shift pedal 403a moves in forward and backward direction for shifting of selected gear by pushing the select lever 410 for shifting of selected gear shift rail. The gear shift pedal 403a is connected with gear shift cable 407 which transfers the force of the forward and backward movement of the gear shift pedal 403a to the shift lever 408 and shift lever transfers the force to the shift 15 tower 409. The Shift tower 409 moves the select lever 410 which is already in the relation with lever of the gear shift rail of the selected gear for shifting of gears in the gear box.
[0039] Fig. 5 illustrates circuit diagram of the controller with the electric motor for selection of gears, in accordance with an embodiment of the present subject 20 matter. The present circuit 500 illustrates connection of controller with the selection switches and indication switches. The controller 404 receives 12volt power supply from the ignition of the vehicle. The Controller 404 is in ON state after receiving the 12V power supply from the ignition. The Controller 404 is connected with the selection switches 503 , 504 provided in the rotating knob 401 25 and the indication switches 504, 505 provide in the gear box near the select lever. Further, the controller 404 is coupled with a display unit in dashboard of the vehicle to indicate the current gear selection based on the inputs received from the indication switches. The selection electric motor 406 has a shaft 406a which can move in low gear direction 506 and fifth and reverse gear direction 506. Each gear 30
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selection at the select lever 410 has indication switches 504, 505. When the select lever 410 is in relation of low gear selection, the indication switch 504 indicates the selection of low gears in the dash board. Similarly, when the select lever 410 is in relation of fifth and reverse gear selection, the indication switch 505 indicates the selection of fifth and reverse gears in the dash board. The selection and 5 shifting of third and fourth gear is same as the previous selection of third and fourth gear in the manual transmission system.
[0040] Fig. 6 illustrates detailed diagram of rotating knob for actuating selection switch for selection of gears, in accordance with an embodiment of the present subject matter. The rotating knob 601 is provided at upper part of the gear shift 10 pedal 403a. The rotating knob 600 has upper rotating part 600a and lower fixed part (not shown in figures). The lower fixed part is joined with the upper portion of the gear shift pedal 403a. The upper rotating part 600a rotates in anti-clockwise or counter clock wise and clockwise directions 602 for selection of low gears, such as first and second gear, and high gears, such as fifth and reverse gear, 15 respectively. The upper rotating part 600a of the knob has a pair of sleeves 603 for actuating or pressing selection switches 604a, 604b. The selection switches 604a, 604b are provided at left and right hand side of the upper portion of the gears shift pedal 403a inside the lower fixed part of the knob 600. The pair of sleeves 603 is provide on the upper rotating part 600a to push the switches 604a, 604b for 20 selection of gears (detailed explanation is provided in the fig. 6). The placement of sleeves and selection switches can be interchanged in the rotating knob 600. When the rotating upper part 604a of the rotating knob 600 rotates in counter clockwise direction, the sleeve 603 pushes the low gear selection switch 604a. When the rotating upper part 604a of the rotating knob 600 rotates in clockwise direction, 25 the other sleeve 603 pushes the fifth and reverse gear selection switch 605a. Upon rotation of the upper rotating part 600a of the rotating knob 600, the pair of sleeves 603 pushes the gear selection switches 604a, 604b and sends corresponding signal to the controller 404 connected with the rotating knob 600 via wires 405. The controller sends the gear selection signal to the selection 30 electric motor.
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[0041] Operations: how to select and shift gears in the single cable gear shift system.
[0042] The present single cable gear shift system has combination of Gear Shift Lever Assembly (GSLA) 403, gear shift tower 409, gear select lever 410 and selection electric motor 406. The single cable gear shift system 400 includes a 5 rotating knob 401 connected with the GSLA 403, a controller 404, a selection electric motor 406, gear select lever 410, and gear shift tower 409. The selection electric motor 406 moves the select lever based on the signals received from the rotating knob.
[0043] Upon ignition of the vehicle, 12volt power is supplied to the controller. 10 After receiving the power the controller and circuit of the single Cable gear shift system is in ON state. The driver can select and shifting the gears in the single cable gear shift system using combination of clutch pedal and gear shift lever assembly. Once the single cable gear shift system is in ON state, the gears can e selected and shifted through GSLA knob in combination with clutch pedal in any 15 condition, i.e., static or dynamic.
[0044] In order to select and shift first gear in the present single cable gear shift system. The rotating knob 401 is rotated towards counter clock wise. Upon rotation in counter clockwise direction, the left side sleeve 603 moves and pushes the low gear selection switch 604a and circuit is completed by pushing the low 20 gear selection switch 604a. The selection switch 604a sends signal to the controller 404, the controller 404 sends the signal to the selection motor 406. The selection motor 406 upon receiving the low gear selection signal from the controller 404 moves the select lever 410 connected with the shaft 406a towards back side direction or direction of lever of low gear shift rail for engagement of 25 gears. After moving the select lever in the low gear direction, the gear shift pedal 403a is pushed in forward side without releasing the knob direction. By low gear selection, the selection indication switch 504 is pressed in the shift tower 409 and selection of low gear is indicated in the dash board.
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[0045] For selecting the gears from first gear to second gear, the rotating knob 401 is rotated towards counter clock wise direction. Upon rotation in counter clockwise direction, the left side sleeve 603 moves and pushes the low gear selection switch 604a and circuit is completed by pushing the low gear selection switch 604a. The selection switch 604a sends signal to the controller 404, the 5 controller 404 sends the signal to the selection motor 406. The selection motor 406 upon receiving the low gear selection signal from the controller 404 tries to move the select lever 410 connected with the shaft 406a towards back side direction or direction of lever of low gear shift rail for engagement of gears. But the select lever 410 is already selected in low side, the selection electric motor 406 10 keeps the selection at low side. The gear shift pedal 403a is pulled in backward side for shifting the second gear. Further, gear shifting of second gear from the first gear is similar to the manual transmission. Like the manual transmission, the select lever 410 remains in position with the lever of low gear shift rail. Therefore, the second gear can be shifted by pushing the gear shift pedal in backward 15 direction from the forward direction. By low gear selection, the selection indication switch 504 is pressed in the shift tower 409 and selection of low gear is indicated in the dash board.
[0046] For selecting and shifting the gears from second (2nd) gear to third (3rd) gear, push the gear shift pedal 403a towards forward side without rotating the 20 rotating knob 401. While pushing the gear shift pedal 403a towards forward side, the shift lever 408 disengages the second (2nd) gear and the selection electric motor 406 moves to the original position, center position, due to spring load of selection at that time and select lever 410 moves its original position Further, no selection for third gear is required as required in traditional system. The pushing 25 of gear shift pedal 403a in forward direction engages, the shift tower pushes the shift lever 408 for shifting of third gear. Similarly, for selecting and shifting of fourth gear from the third gear, by pushing the gear shift pedal in backward side disengages the third gear and engages the fourth gear. There is no selection for shifting of third and fourth gear. The third and fourth gear is shifting by pushing 30
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and pulling the gear shift pedal 403a towards forward and back side respectively.
[0047] For selecting and shifting fifth (5th) gear from the fourth gear, the rotating knob 401 is rotated towards clock wise for selecting the fifth (5th) gear. Upon rotation in clockwise direction, the sleeve 603 moves and pushes the fifth and 5 reverse gear selection switch 604b and circuit is completed by pushing the fifth and reverse gear selection switch 604b. The fifth and reverse gear selection switch 604b sends signal to the controller 404, the controller 404 sends the signal to the selection electric motor 406. The selection electric motor 406, upon receiving the fifth and reverse gear selection signal from the controller 404, moves the select 10 lever 410 connected with the shaft 406a towards forward side direction or direction of lever of fifth and reverse gear shift rail for selection of gears. The gear shift pedal 403a is pushed in forward side for shifting the fifth gear. By rotating the rotating knob, the select lever moves to fifth and reverse gear shift rail. By pushing the gear shift pedal 403a in forward direction, the shift lever 408 engages 15 with the fifth gear.
[0048] Further gear shift of reverse gear is not possible from 5th gear. Disengaged the 5th gear first by pulling the shift pedal 403a, after disengaging the 5th gear, select lever 410 moves its original condition (neutral condition) due to select spring force. For selection and shifting reverse gear from neutral condition the 20 rotating knob 401 is rotated toward clock wise for selection the reverse gear. Upon rotation in clockwise direction, the sleeve 603 moves and pushes the fifth and reverse gear selection switch 604b and circuit is completed by pushing the fifth and reverse gear selection switch 604b. The fifth and reverse gear selection switch 604b sends signal to the controller 404, the controller 404 sends the signal 25 to the selection electric motor 406. The selection electric motor 406, upon receiving the fifth and reverse gear selection signal from the controller 404, moves the select lever 410 connected with the shaft 406a towards forward side direction or direction of lever of fifth and reverse gear shift rail for selection of gears. The gear shift pedal 403a is pulling backward side for shifting the reverse gear. By 30
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rotating the rotating knob, the select lever moves to fifth and reverse gear shift rail. By pulling the gear shift pedal 403a in backward direction, the shift lever 408 engages with the reverse gear.
[0049] For Reverse shifting from any other gears except 5th gear is just rotate the rotating knob 401 towards clock wise and pull the shift pedal 403a towards 5 backward side for shifting the reverse gear. The selection indication switch 505 is pressed in the shift tower 409 and selection of fifth and reverse gear is indicated in the dash board.
[0050] For selecting and shifting, first or second gear from fifth gear the rotating knob 401 is rotated towards counter clock wise. Upon rotation in counter-10 clockwise direction, the sleeve 603 moves and pushes the low gear selection switch 604a and circuit is completed by pushing the low gear selection switch 604a. The low gear selection switch 604a sends signal to the controller 404, the controller 404 sends the signal to the selection electric motor 406. The selection electric motor 406, upon receiving the low gear selection signal from the 15 controller 404, tries to move back side for low gear selection but the selection motor does not move due to its engagement with the fifth gear. When the gear shift pedal 403a moves toward neutral position, the select lever 410 disengages from the fifth gear and the selection electric motor 406 moves the select lever 410 connected with the shaft 406a towards backward side direction or direction of 20 lever of low gear shift rail for engagement of gears. The gear shift pedal 403a is pushed in forward side or backward side for shifting the first and second gear respectively. By low gear selection, the selection indication switch 504 is pressed in the shift tower 409 and selection of low gear is indicated in the dash board.
[0051] Pushing the gear shift pedal 403a in neutral direction, the gear shift pedal 25 403a disengages the shift lever 408 from the engaged gear whatever is shifted and select lever 410 free from any of selection in the transmission
[0052] The present single cable gear shift system gear selection and shifting is simple. Further, in the present system there is no requirement for remembering the H pattern. Due to single cable for shifting of gears, there is no bell crank for 30
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selection is required resulting compact GSLA. There is no selection cable. Further, gears can be selected in I direction therefore, no space is required for selection in passenger cabin. Due to indication of selection position in dashboard, it becomes easy for performing the selection actions.
[0053] Although embodiments for the present subject matter have been described 5 in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/device of the present invention will be apparent to those skilled in the art, and thus it is 10 intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:
1. A single cable gear shift system (400) for selecting and shifting gears in manual gear transmission system of a vehicle, the single cable gear shift system (400) comprising: 5
a rotating knob (401) rotates for actuating/pushing low gear switch (604a) and fifth and reverse gear switch (604b);
a controller (404) connected with the rotating knob (401) through wires, the controller (404) receives the actuated signal from the rotating knob (401) and sends the actuated signal to selection electric motor (406) 10 for selection of gears;
the selection electric motor (406), based upon received the actuated signal, moves select lever (410) of shift tower (4109) in direction of low gear selection and fifth and reverse gear selection; and
a gear shift pedal (403) connected with the shift tower (409) through 15 single shift cable (407), the gear shift pedal moves in forward and backward direction for shifting of selected gears through the select lever (407).
2. The single cable gear shift system (400) as claimed in claim 1, wherein the rotating knob (401) rotates in counter clockwise direction for actuation of 20 low gear selection switch (604a).
3. The single cable gear shift system (400) as claimed in claim 1, wherein the rotating knob (401) rotates in clockwise direction for actuation of fifth and reverse gear selection switch (604b). 25
4. The single cable gear shift system (400) as claimed in claim 1, wherein the selection motor (406)
upon receiving the low gear selection signal from the controller (404), moves the select lever (410) towards lever of low gear shift rail for 30 selection of low gears;
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upon receiving the fifth and reverse gear selection signal from the controller (404), moves the select lever (410) towards lever of fifth and reverse gear shift rail for selection of fifth and reverse gear.
5. The single cable gear shift system (400) as claimed in claim 1, wherein the 5 select lever (410) moves original center position when gear is in neutral position.
6. The single cable gear shift system (400) as claimed in claim 1, wherein the selection motor (406) has a shaft (406a) which is connected with pivoted 10 select lever (410) and moves the select lever (410) in forward and backward direction.
7. The single cable gear shift system (400) as claimed in claim 1, wherein the gear shift pedal (403) moves in forward and backward direction for shifting 15 of gears.
8. The single cable gear shift system (400) as claimed in claim 1, wherein low selection indication switch (604a) and fifth and reverse gear selection indication switch (604b) is actuated by the shift tower (409) during selection 20 of the low gears and the fifth and reverse gear.
9. The single cable gear shift system (400) as claimed in claim 1, wherein the controller (404) is coupled with a display unit in dashboard for displaying current gear position. 25
10. The single cable gear shift system (400) as claimed in claim 1, wherein the controller (404) receives power from vehicle ignition and activates the single cable gear shift system (400).