[001] The present subject matter described herein, relates to manual transmission system for gear shifting, and, in particular, to a single shaft integrated sliding shift system for shifting gears in five speed forward and one speed reverse gear manual transmission.
[002] The present application is filed as patent of addition of the parent application no: 201611026051 filed on July 29, 2016 titled as "SINGLE SHAFT INTEGRATED SHIFTING SYSTEM FOR A 5-SPEED MANUAL TRANSMISSION".
BACKGROUND AND PRIOR ART:
[003] Generally, in manual transmission gearbox, three rail/shifting shafts are used to shift the gears. On the three shifting shafts, low speed gears, high speed gears, and 5* and reverse gear selection mechanism is enabled. Further, the gearbox has a reverse idler assembly for engaging the vehicle in reverse gear. Generally, the reverse idler assembly has a reverse input gear driven by the input shaft, a reverse output gear driving output shaft, and a reverse idler gear which is selectively movable into meshed engagement with the reverse input gear and the reverse output gear for driving the output shaft in a second direction. The reverse idler gear is a gear used to change the direction of the rotation of the shafts.
[004] Figures 1 & 2 show existing three shaft shifting system used in the five (5) speed manual transmission systems. In the figure 1, the three shaft shifting system 100 has a low speed shaft set 101, high speed shaft set 102, and 5* and reverse gear shaft set 103. On the each of the shifting shaft sheet metal fork and yoke is mounted or welded. Based on the selection of the gear, the corresponding shaft moves and performs the action. In the figure 2(a), the low speed shaft set 101 is explained. In the low speed shaft set 101, a fork 202 and yoke 203 is mounted on

the low speed shaft 201. The fork 202 and the yoke 203 are positively mounted, such as welded on the low speed shaft 201.
[005] Similarly, in the high speed shaft set 102 (as shown in figure 2(b)), a fork 206 and yoke 205 is mounted on the high speed shaft 204. The fork 206 and the yoke 205 are positively mounted, such as welded on the high speed shaft 204.
[006] As shown in figure 2(c), the 5* and reverse gear shaft set 103 has a shaft 207, a fork 208, a yoke 209 and a reverse gear arm 210. The fork 208, yoke 209, and the reverse gear arm 210 are positively mounted on the shaft 207. Once all the shaft sets are ready, the multiple shifting shafts are arranged to make a multi shaft shifting system as illustrated in figure 1.
[007] In the existing three shaft system, a big space is required for fitting and arrangement of the multiple shafts in the gearbox which increases the size of the gearbox and ultimately creates space constraint problem in the vehicle. Further, multiple shaft of the shifting system adds extra weight and cost on the vehicle.
[008] Further, single shaft shifting systems are known in the prior art for example Japense Patent Application JP4232072B2, Chinese Patent Application CN202937796U, and German Patent Application DE102014204290A1, which disclose the features of using fewer parts, utilizing single moving shaft, and more economically feasible system, and less space requirement.
[009] In the known prior arts, reverse gear mechanism is a separate system apart from the forward gears system. Therefore, a separate system is required for reverse gear mechanism. In the prior arts, a separate yoke with lever system is required for reverse gear mechanism. Further, in order to operate with separate system, a second shift finger on the shift tower is used for shifting the reverse gear.
[0010] Though these prior arts discuss about the single shaft shifting systems, but each has its own drawbacks and limitations. These known systems are costly and have several special parts and extra parts which are very complex. Further, this complexity makes the serviceability of the system difficult and costly. Therefore,

a simple and inexpensive single shaft shifting system is required which is effective for reverse gearing along with forward gear mechanism.
OBJECTS OF THE INVENTION:
[0011] The principal objective of the present invention is to provide a single shaft integrated shifting system for five speed manual transmission.
[0012] Another object of the present subject matter is to use single shift shaft to mount all the fork and yoke of all the gears.
[0013] Another object of the present invention is to integrate reverse gear arm with the fifth (5* ) gear comp.
[0014] Another object of the present invention is to provide simple structure to eliminate complexity of separate reverse gear system in the gearbox.
[0015] Another object of the present invention is to provide a small, simple, and effective single shift shaft system which consume less space in the vehicle.
[0016] Yet another object of the present invention is to provide light weight and low cost system for manual transmission.
SUMMARY OF THE INVENTION:
[0017] The present subject matter disclosed herein relates to a single shaft integrated shifting system for shifting gears in five forward and one reverse gear manual transmission in vehicles. The present single shaft integrated shifting system has one shifting shaft acting as a support and guide-way to three (3) sets of gear shifting forks and yokes. The present single shaft integrated shifting system is capable of shifting 6 gears, i.e., five (5) forward gears and one (1) reverse gear in the manual transmission. In the present system, shift fork and yoke of low speed gears, high speed gears and fifth (5*) gear integrated with reverse gear arm are coaxially mounted on the single shift shaft using sliding bearings. The shift fork of the low speed gears, high speed gears and fifth (5*) gear integrated with reverse gear floats/slides on the single shift shaft with the help of sliding bearings and the single shift shaft doesn't move.

[0018] In order to further understand the characteristics and technical contents of 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
[0019] It is to be noted, however, that the appended drawings illustrate only 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 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:
[0020] Fig. 1 illustrates three shifting shaft system for five (5) speed manual transmission system as known in the art;
[0021] Fig. 2 (a), (b), and (c) illustrate each shaft of the three shifting shaft system for five (5) speed manual transmission system in detail as known in the art;
[0022] Fig. 3 illustrates mounting of plurality of gear comps over a single shift shaft, in accordance with an embodiment of the present subject member;
[0023] Fig. 4(a), (b), and (c) illustrate structure of each component of the single shift shifting system in detail, in accordance with an embodiment of the present subject matter;
[0024] Fig. 5 illustrates the single shaft integrated shifting system for manual transmission, in accordance with an embodiment of the present subject matter; and

[0025] Fig. 6 and 7 illustrates the arrangement of reverse gear arm with the reverse gear system in the single shaft integrated shifting system, in accordance with the present subject matter.
[0026] The figures depict embodiments of the present subject matter for the 5 purposes of illustration only. A person skilled in the art will easily recognize from 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:
10 [0027] The subject matter disclosed herein relates to a single shaft integrated shifting system for shifting gears in five forward and one reverse gear manual transmission in vehicles. The present single shaft integrated shifting system has one shifting shaft acting as a support and guide-way to three (3) sets of gear shifting forks and yokes. The present single shaft integrated shifting system is
15 capable of shifting 6 gears, i.e., five (5) forward gears and one (1) reverse gear in the manual transmission. In the present system, shift fork and yoke of low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear are coaxially mounted on the single shift shaft using sliding bearings. The shift fork of the low speed gears, high speed gears and fifth (5th) gear integrated with
20 reverse gear floats/slides on the single shift shaft with the help of sliding bearings and the single shift shaft doesn’t move.
[0028] Conventionally, a separate system apart from the forward gears system is required for the reverse gear shifting. In this system, a separate yoke with lever system is required for reverse gear mechanism. Further, in order to operate with 25 separate system, a second shift finger on the shift tower is used for shifting the reverse gear. Accordingly, the known systems are costly and have several special parts and extra parts which are very complex. Further, this complexity makes the serviceability of the system difficult and costly.
6

[0029] According to present subject matter, shift forks of all the gears are mounted on the single shift shaft. The shift fork of the low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear floats/slides on the single shift shaft with the help of sliding bearings and the single shift shaft doesn’t 5 move. In the present system, no separate mechanism for reverse gear shifting is required. Through the present system, requirement of an extra system for reverse gear is eliminated.
[0030] 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
10 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 skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject
15 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 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
20 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 following description when considered in connection with the accompanying figures.
25 [0031] 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 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
30 principles of the present subject matter and are included within its scope.
7

[0032] Fig. 3 illustrates mounting of plurality of shaft comps over a single shift shaft, in accordance with an embodiment of the present subject. As shown in figure 3, a single shaft integrated shifting system 300 includes a single shift shaft 301, low speed gear comp 304, high speed gear comp 303 and a fifth (5th) speed 5 gear comp 302 integrated with reverse gear arm 305. The low speed gear comp 304, the high speed gear comp 303, the fifth (5th) speed gear comp 302 integrated with the reverse gear arm 305 (collectively referred as components/comps or individually referred as component/comp) are coaxially mounted on the single shifting shaft 301. Every component has through bore or hole to receive the single
10 shift shaft 301. Where the low speed gear comp 304, the high speed gear comp 303, the fifth gear comp 302 integrated with the reverse gear arm 305 are coaxially mounted on the single shift shaft 301 using sliding bearings. A sliding bearing is provided between the bores of the low speed gear comp 304, the high speed gear comp 303, the fifth (5th) gear comp 302 integrated with reverse gear
15 arm 305 and the single shifting shaft 301.
[0033] Fig. 4(a), (b), and (c) illustrate structure of each component of the single shift shifting system in detail, in accordance with an embodiment of the present subject matter. Figure 4(a) illustrates structure of a low speed gear comp 304 in accordance with an embodiment of the present subject matter. The low speed gear
20 comp 304 comprises a semicircular shift fork 304a at one end and a circular through bore 304c at other end. Further, both the ends are connected with a rectangular metal sheet 304d which has an integrated yoke 304b. The shift fork 304a is integrated with yoke 304b. At the upper side of the shift fork 304a a circular bore 304c is present to receive the single shift shaft 301. The present low
25 speed gear comp 304 is a single or unitary structure having the shift fork 304a, two bores 304c, and the yoke 304b. Further, the low speed gear comp 304 is made of single sheet metal which has high strength and stress holding capability. The low speed gear comp 304 is coaxially mounted on the single shift shaft 301 through the circular bore. The low speed gear comp 304 is slid-ably mounted on
30 the single shift shaft 301 using sliding bearings. In the low speed gear comp 304, two sliding bearings are used. One sliding bearing at one bore 304c which is near
8

the yoke 304b and another sliding bearing at another bore 304c which is above the shift fork 304a. The bore 304c near the yoke 304b provides support to the yoke 304b and avoids hanging of the yoke 304b on the single shift shaft 301.
[0034] Figure 4(b) illustrates structure of a high speed gear comp 303 in 5 accordance with an embodiment of the present subject matter. The high speed gear comp 303 comprises a semicircular shift fork 303a, a yoke 303b and a circular through bore which is not visible in the figure. The circular through bore is below the base of the yoke 303b and above the semicircular shift fork 303a to receive the single shift shaft 301. The present high speed gear comp 303 is a
10 single or unitary structure having the semicircular shift fork 303a, a circular bore, and the yoke 303b. The shift fork 303a is integrated with yoke 303b. Further, the high speed gear comp 303 is made of single sheet metal which has high strength. The high speed gear comp 303 is coaxially mounted on the single shift shaft 301 through the circular bore. The high speed gear comp 303 is slid-ably mounted on
15 the single shift shaft 301 using sliding bearing. In the high speed gear comp 303, one sliding bearing is used at the circular bore which allows the movement of the shift fork 303a upon selection of the gear.
[0035] Figure 4(c) illustrates structure of a fifth (5th) speed gear comp integrated with reverse gear arm in accordance with the present subject matter. The fifth (5th)
20 speed gear comp 302 and the reverse gear arm 305 are integrated with each other and constitute a single part. The fifth (5th) speed gear comp 302 has semicircular shift fork 302a at one end and a circular through bore (which is not visible in the drawing) at other end. Further, both the ends are connected with a rectangular metal sheet 302d which has an integrated yoke 302b. At the upper side of the shift
25 fork 302a a circular bore (which is not visible in the drawing) is present to receive the single shift shaft 301. The shift fork 302a is integrated with yoke 302b. The present fifth (5th) speed gear comp 302 along with the reverse gear arm 305 is a single or unitary structure having the shift fork 302a, two bores, and the yoke 302b. Further, the fifth (5th) speed gear comp 302 is made of single sheet metal
30 which has high strength. The fifth (5th) speed gear comp 302 integrated with
9

reverse gear arm 305 is coaxially mounted on the single shift shaft 301 through the circular bores. Further, the movement of the fifth (5th) speed gear comp 302 integrated with reverse gear arm 305 is restricted about its circular movement over the single shift shaft 302.
5 [0036] Fig. 5 illustrates the single shaft integrated shifting system for manual transmission, in accordance with an embodiment of the present subject matter. In the figure 3 and 4, details about the structure of the system and its components has been defined. Figure 5 is equivalent to figure 3 for which explanation is given above. As shown in figure 5, a single shaft integrated shifting system 500 includes
10 a single shifting shaft 501 (same as 301 in figure 3), low speed gear comp 504 (same as 304 in figure 3), high speed gear comp 503 (same as 303 in figure 3) and an integrated 5th gear comp 502 with reverse gear arm 505 (same as 302 and 305 in figure 3). All the above mentioned components are arranged in a pre-defined sequence as explained in figure 3. Once the single shifting shaft 501 passes
15 through bores of all the components, all the comp such as low speed gear comp (504), high speed gear comp (503) and the fifth (5th) gear comp 502 integrated with the reverse gear arm 505 are coaxially mounted on the single shifting shaft 501 using sliding bearing.
[0037] Further, all the components are manufactured in manner that their yokes 20 come in line with proper support from both the ends. The low speed gear comp, the high speed gear comp and the fifth (5th) speed gear comp integrated with the reverse gear have bores to support the comps over the single shift shaft. As explained above, the shift fork of the low speed gear comp 504, the high speed gear comp 503 and the fifth (5th) speed gear comp integrated with the reverse gear 25 floats/slides on the single shift shaft 501 with the help of sliding bearings.
[0038] Fig. 6 and 7 illustrates the arrangement of reverse gear arm with the reverse gear system in the single shaft integrated shifting system, in accordance with the present subject matter. In the figure 6, reverse gear arm 605 is which is integrated with the fifth (5th) speed gear (not shown in the figures) is coaxially 30 mounted on the single shift shaft 601 using bearings. The shape and configuration
10

of the reverse gear arm 605 is such that it does not restrict or obstruct movement of the shift fork of the low speed gear comp. The reverse gear arm 305 is an "L-Shaped" structure. The horizontal arm of the reverse gear arm, which is connected with the reverse gear assembly 606, is kept as short as possible such that it does not restrict or obstruct movement of the shift fork of the low speed gear comp and to avoid deflection. Further, the vertical arm of the reverse gear arm 605, which is integrated with the fifth (5*) speed gear comp, has increasing thickness towards the single shaft to minimize the deflection. Further, the reverse gear arm 605 is engaged with the reverse gear assembly 606 which has an idler gear assembly for putting the gears in reverse direction. The reverse idler gear is a gear used to change the direction of the rotation of the shafts. When the selection for reverse gear is made, the reverse gear arm 605 integrated with the fifth (5*) speed gear (not shown in the figures) mounted on the single shift shaft 601 moves and pushes the reverse idler gear to engage in between input and out gears. Further, working of the reverse gear with respect to input and output gear is well known. In the present system, there is no requirement of separate yoke and lever system for reverse gear. From the present system, yoke of fifth (5*) speed gear comp is used to give input or selection for the reverse gear. In the present system, reverse gear arm receives the selection from yoke of the fifth (5*) speed gear comp where the yoke receives the selection from the same finger/lever of shift tower shaft. In the present system is very simple system in which selection of reverse gear can be made directly from the single shift shaft. The present system is very simple and cost effective.
[0039] Although embodiments for the present subject matter have been described 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 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 shaft integrated shifting system (300, 500) for selection and engagement of gears in five (5) speed manual transmission along with reverse gear, the single shaft integrated shifting system (300) comprising:
a single shift shaft (301, 501, 601); and
a low speed gear comp (304, 504), a high speed gear comp (303, 503) and a fifth (5th) speed gear comp (302, 502) integrated with a reverse gear arm (305, 505) are coaxially mounted on the single shift shaft (301, 501, 601) using sliding bearings;
2. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein shift fork (304a) of low speed gear comp (304, 504) is integrated with a yoke (304b).

3. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein shift fork (303a) of high speed gear comp (303, 503) is integrated with a yoke (303b).

4. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein the low speed gear comp (304, 504) ,the high speed gear comp (303, 503) and the fifth (5th) speed gear comp (302, with the reverse gear (305, 505) have through bore(s) (304c) to receive 502) integrated the single shift shaft (301, 501, 601) coaxially.

5. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein shift fork (302a) of the fifth (5th) speed gear comp (302, 502) integrated with the reverse gear arm (305, 505) is integrated with a yoke (302b).

6. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein the low speed gear comp (304, 504), the high speed gear comp (303, 503), and the fifth (5th) speed gear comp (302, 502) are made of single sheet metal.

7. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein each of the low speed gear comp (304, 504), the high speed gear comp (303, 503), and the fifth (5th) speed gear comp (302, 502) integrated with the reverse gear arm (305, 505) is unitary structure.

8. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein the low speed gear comp (304, 504),the high speed gear comp (303, 503) and the fifth (5th) gear speed comp (302, 502) integrated with the reverse gear (305, 505) are axially slid-able on the single shift shaft (301, 501, 601) along axis of the single shift shaft (301, 501, 601).

9. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein the reverse gear arm (305, 505, 605) is “L-Shaped”, having increasing thickness in the vertical arm towards the single shaft and is directly engaged with reverse gear system (606) having idler gear.

10. The single shaft integrated shifting system (300, 500) as claimed in claim 1, wherein the low speed gear comp (304, 504) and the fifth (5th) speed gear comp (302, 502) integrated with the reverse arm (305, 505) has support from both the ends on the single shift shaft (301, 501, 601).
, Description:SINGLE SHAFT INTEGRATED SHIFTING SYSTEM FOR A 5-SPEED MANUAL TRANSMISSION
FIELD OF INVENTION:
[001] The present subject matter described herein, relates to manual transmission system for gear shifting, and, in particular, to a single shaft integrated sliding shift system for shifting gears in five speed forward and one speed reverse gear manual transmission.
[002] The present application is filed as patent of addition of the parent application no: 201611026051 filed on July 29, 2016 titled as “SINGLE SHAFT INTEGRATED SHIFTING SYSTEM FOR A 5-SPEED MANUAL TRANSMISSION”.

BACKGROUND AND PRIOR ART:
[003] Generally, in manual transmission gearbox, three rail/shifting shafts are used to shift the gears. On the three shifting shafts, low speed gears, high speed gears, and 5th and reverse gear selection mechanism is enabled. Further, the gearbox has a reverse idler assembly for engaging the vehicle in reverse gear. Generally, the reverse idler assembly has a reverse input gear driven by the input shaft, a reverse output gear driving output shaft, and a reverse idler gear which is selectively movable into meshed engagement with the reverse input gear and the reverse output gear for driving the output shaft in a second direction. The reverse idler gear is a gear used to change the direction of the rotation of the shafts.
[004] Figures 1 & 2 show existing three shaft shifting system used in the five (5) speed manual transmission systems. In the figure 1, the three shaft shifting system 100 has a low speed shaft set 101, high speed shaft set 102, and 5th and reverse gear shaft set 103. On the each of the shifting shaft sheet metal fork and yoke is mounted or welded. Based on the selection of the gear, the corresponding shaft moves and performs the action. In the figure 2(a), the low speed shaft set 101 is explained. In the low speed shaft set 101, a fork 202 and yoke 203 is mounted on the low speed shaft 201. The fork 202 and the yoke 203 are positively mounted, such as welded on the low speed shaft 201.
[005] Similarly, in the high speed shaft set 102 (as shown in figure 2(b)), a fork 206 and yoke 205 is mounted on the high speed shaft 204. The fork 206 and the yoke 205 are positively mounted, such as welded on the high speed shaft 204.
[006] As shown in figure 2(c), the 5th and reverse gear shaft set 103 has a shaft 207, a fork 208, a yoke 209 and a reverse gear arm 210. The fork 208, yoke 209, and the reverse gear arm 210 are positively mounted on the shaft 207. Once all the shaft sets are ready, the multiple shifting shafts are arranged to make a multi shaft shifting system as illustrated in figure 1.
[007] In the existing three shaft system, a big space is required for fitting and arrangement of the multiple shafts in the gearbox which increases the size of the gearbox and ultimately creates space constraint problem in the vehicle. Further, multiple shaft of the shifting system adds extra weight and cost on the vehicle.
[008] Further, single shaft shifting systems are known in the prior art for example Japense Patent Application JP4232072B2, Chinese Patent Application CN202937796U, and German Patent Application DE102014204290A1, which disclose the features of using fewer parts, utilizing single moving shaft, and more economically feasible system, and less space requirement.
[009] In the known prior arts, reverse gear mechanism is a separate system apart from the forward gears system. Therefore, a separate system is required for reverse gear mechanism. In the prior arts, a separate yoke with lever system is required for reverse gear mechanism. Further, in order to operate with separate system, a second shift finger on the shift tower is used for shifting the reverse gear.
[0010] Though these prior arts discuss about the single shaft shifting systems, but each has its own drawbacks and limitations. These known systems are costly and have several special parts and extra parts which are very complex. Further, this complexity makes the serviceability of the system difficult and costly. Therefore, a simple and inexpensive single shaft shifting system is required which is effective for reverse gearing along with forward gear mechanism.
OBJECTS OF THE INVENTION:
[0011] The principal objective of the present invention is to provide a single shaft integrated shifting system for five speed manual transmission.
[0012] Another object of the present subject matter is to use single shift shaft to mount all the fork and yoke of all the gears.
[0013] Another object of the present invention is to integrate reverse gear arm with the fifth (5th) gear comp.
[0014] Another object of the present invention is to provide simple structure to eliminate complexity of separate reverse gear system in the gearbox.
[0015] Another object of the present invention is to provide a small, simple, and effective single shift shaft system which consume less space in the vehicle.
[0016] Yet another object of the present invention is to provide light weight and low cost system for manual transmission.
SUMMARY OF THE INVENTION:
[0017] The present subject matter disclosed herein relates to a single shaft integrated shifting system for shifting gears in five forward and one reverse gear manual transmission in vehicles. The present single shaft integrated shifting system has one shifting shaft acting as a support and guide-way to three (3) sets of gear shifting forks and yokes. The present single shaft integrated shifting system is capable of shifting 6 gears, i.e., five (5) forward gears and one (1) reverse gear in the manual transmission. In the present system, shift fork and yoke of low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear arm are coaxially mounted on the single shift shaft using sliding bearings. The shift fork of the low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear floats/slides on the single shift shaft with the help of sliding bearings and the single shift shaft doesn’t move.
[0018] In order to further understand the characteristics and technical contents of 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
[0019] It is to be noted, however, that the appended drawings illustrate only 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 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:
[0020] Fig. 1 illustrates three shifting shaft system for five (5) speed manual transmission system as known in the art;
[0021] Fig. 2 (a), (b), and (c) illustrate each shaft of the three shifting shaft system for five (5) speed manual transmission system in detail as known in the art;
[0022] Fig. 3 illustrates mounting of plurality of gear comps over a single shift shaft, in accordance with an embodiment of the present subject member;
[0023] Fig. 4(a), (b), and (c) illustrate structure of each component of the single shift shifting system in detail, in accordance with an embodiment of the present subject matter;
[0024] Fig. 5 illustrates the single shaft integrated shifting system for manual transmission, in accordance with an embodiment of the present subject matter; and
[0025] Fig. 6 and 7 illustrates the arrangement of reverse gear arm with the reverse gear system in the single shaft integrated shifting system, in accordance with the present subject matter.
[0026] 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 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:
[0027] The subject matter disclosed herein relates to a single shaft integrated shifting system for shifting gears in five forward and one reverse gear manual transmission in vehicles. The present single shaft integrated shifting system has one shifting shaft acting as a support and guide-way to three (3) sets of gear shifting forks and yokes. The present single shaft integrated shifting system is capable of shifting 6 gears, i.e., five (5) forward gears and one (1) reverse gear in the manual transmission. In the present system, shift fork and yoke of low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear are coaxially mounted on the single shift shaft using sliding bearings. The shift fork of the low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear floats/slides on the single shift shaft with the help of sliding bearings and the single shift shaft doesn’t move.
[0028] Conventionally, a separate system apart from the forward gears system is required for the reverse gear shifting. In this system, a separate yoke with lever system is required for reverse gear mechanism. Further, in order to operate with separate system, a second shift finger on the shift tower is used for shifting the reverse gear. Accordingly, the known systems are costly and have several special parts and extra parts which are very complex. Further, this complexity makes the serviceability of the system difficult and costly.
[0029] According to present subject matter, shift forks of all the gears are mounted on the single shift shaft. The shift fork of the low speed gears, high speed gears and fifth (5th) gear integrated with reverse gear floats/slides on the single shift shaft with the help of sliding bearings and the single shift shaft doesn’t move. In the present system, no separate mechanism for reverse gear shifting is required. Through the present system, requirement of an extra system for reverse gear is eliminated.
[0030] 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 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 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 following description when considered in connection with the accompanying figures.
[0031] 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 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.
[0032] Fig. 3 illustrates mounting of plurality of shaft comps over a single shift shaft, in accordance with an embodiment of the present subject. As shown in figure 3, a single shaft integrated shifting system 300 includes a single shift shaft 301, low speed gear comp 304, high speed gear comp 303 and a fifth (5th) speed gear comp 302 integrated with reverse gear arm 305. The low speed gear comp 304, the high speed gear comp 303, the fifth (5th) speed gear comp 302 integrated with the reverse gear arm 305 (collectively referred as components/comps or individually referred as component/comp) are coaxially mounted on the single shifting shaft 301. Every component has through bore or hole to receive the single shift shaft 301. Where the low speed gear comp 304, the high speed gear comp 303, the fifth gear comp 302 integrated with the reverse gear arm 305 are coaxially mounted on the single shift shaft 301 using sliding bearings. A sliding bearing is provided between the bores of the low speed gear comp 304, the high speed gear comp 303, the fifth (5th) gear comp 302 integrated with reverse gear arm 305 and the single shifting shaft 301.
[0033] Fig. 4(a), (b), and (c) illustrate structure of each component of the single shift shifting system in detail, in accordance with an embodiment of the present subject matter. Figure 4(a) illustrates structure of a low speed gear comp 304 in accordance with an embodiment of the present subject matter. The low speed gear comp 304 comprises a semicircular shift fork 304a at one end and a circular through bore 304c at other end. Further, both the ends are connected with a rectangular metal sheet 304d which has an integrated yoke 304b. The shift fork 304a is integrated with yoke 304b. At the upper side of the shift fork 304a a circular bore 304c is present to receive the single shift shaft 301. The present low speed gear comp 304 is a single or unitary structure having the shift fork 304a, two bores 304c, and the yoke 304b. Further, the low speed gear comp 304 is made of single sheet metal which has high strength and stress holding capability. The low speed gear comp 304 is coaxially mounted on the single shift shaft 301 through the circular bore. The low speed gear comp 304 is slid-ably mounted on the single shift shaft 301 using sliding bearings. In the low speed gear comp 304, two sliding bearings are used. One sliding bearing at one bore 304c which is near the yoke 304b and another sliding bearing at another bore 304c which is above the shift fork 304a. The bore 304c near the yoke 304b provides support to the yoke 304b and avoids hanging of the yoke 304b on the single shift shaft 301.
[0034] Figure 4(b) illustrates structure of a high speed gear comp 303 in accordance with an embodiment of the present subject matter. The high speed gear comp 303 comprises a semicircular shift fork 303a, a yoke 303b and a circular through bore which is not visible in the figure. The circular through bore is below the base of the yoke 303b and above the semicircular shift fork 303a to receive the single shift shaft 301. The present high speed gear comp 303 is a single or unitary structure having the semicircular shift fork 303a, a circular bore, and the yoke 303b. The shift fork 303a is integrated with yoke 303b. Further, the high speed gear comp 303 is made of single sheet metal which has high strength. The high speed gear comp 303 is coaxially mounted on the single shift shaft 301 through the circular bore. The high speed gear comp 303 is slid-ably mounted on the single shift shaft 301 using sliding bearing. In the high speed gear comp 303, one sliding bearing is used at the circular bore which allows the movement of the shift fork 303a upon selection of the gear.
[0035] Figure 4(c) illustrates structure of a fifth (5th) speed gear comp integrated with reverse gear arm in accordance with the present subject matter. The fifth (5th) speed gear comp 302 and the reverse gear arm 305 are integrated with each other and constitute a single part. The fifth (5th) speed gear comp 302 has semicircular shift fork 302a at one end and a circular through bore (which is not visible in the drawing) at other end. Further, both the ends are connected with a rectangular metal sheet 302d which has an integrated yoke 302b. At the upper side of the shift fork 302a a circular bore (which is not visible in the drawing) is present to receive the single shift shaft 301. The shift fork 302a is integrated with yoke 302b. The present fifth (5th) speed gear comp 302 along with the reverse gear arm 305 is a single or unitary structure having the shift fork 302a, two bores, and the yoke 302b. Further, the fifth (5th) speed gear comp 302 is made of single sheet metal which has high strength. The fifth (5th) speed gear comp 302 integrated with reverse gear arm 305 is coaxially mounted on the single shift shaft 301 through the circular bores. Further, the movement of the fifth (5th) speed gear comp 302 integrated with reverse gear arm 305 is restricted about its circular movement over the single shift shaft 302.
[0036] Fig. 5 illustrates the single shaft integrated shifting system for manual transmission, in accordance with an embodiment of the present subject matter. In the figure 3 and 4, details about the structure of the system and its components has been defined. Figure 5 is equivalent to figure 3 for which explanation is given above. As shown in figure 5, a single shaft integrated shifting system 500 includes a single shifting shaft 501 (same as 301 in figure 3), low speed gear comp 504 (same as 304 in figure 3), high speed gear comp 503 (same as 303 in figure 3) and an integrated 5th gear comp 502 with reverse gear arm 505 (same as 302 and 305 in figure 3). All the above mentioned components are arranged in a pre-defined sequence as explained in figure 3. Once the single shifting shaft 501 passes through bores of all the components, all the comp such as low speed gear comp (504), high speed gear comp (503) and the fifth (5th) gear comp 502 integrated with the reverse gear arm 505 are coaxially mounted on the single shifting shaft 501 using sliding bearing.
[0037] Further, all the components are manufactured in manner that their yokes come in line with proper support from both the ends. The low speed gear comp, the high speed gear comp and the fifth (5th) speed gear comp integrated with the reverse gear have bores to support the comps over the single shift shaft. As explained above, the shift fork of the low speed gear comp 504, the high speed gear comp 503 and the fifth (5th) speed gear comp integrated with the reverse gear floats/slides on the single shift shaft 501 with the help of sliding bearings.
[0038] Fig. 6 and 7 illustrates the arrangement of reverse gear arm with the reverse gear system in the single shaft integrated shifting system, in accordance with the present subject matter. In the figure 6, reverse gear arm 605 is which is integrated with the fifth (5th) speed gear (not shown in the figures) is coaxially mounted on the single shift shaft 601 using bearings. The shape and configuration of the reverse gear arm 605 is such that it does not restrict or obstruct movement of the shift fork of the low speed gear comp. The reverse gear arm 305 is an “L-Shaped” structure. The horizontal arm of the reverse gear arm, which is connected with the reverse gear assembly 606, is kept as short as possible such that it does not restrict or obstruct movement of the shift fork of the low speed gear comp and to avoid deflection. Further, the vertical arm of the reverse gear arm 605, which is integrated with the fifth (5th) speed gear comp, has increasing thickness towards the single shaft to minimize the deflection. Further, the reverse gear arm 605 is engaged with the reverse gear assembly 606 which has an idler gear assembly for putting the gears in reverse direction. The reverse idler gear is a gear used to change the direction of the rotation of the shafts. When the selection for reverse gear is made, the reverse gear arm 605 integrated with the fifth (5th) speed gear (not shown in the figures) mounted on the single shift shaft 601 moves and pushes the reverse idler gear to engage in between input and out gears. Further, working of the reverse gear with respect to input and output gear is well known. In the present system, there is no requirement of separate yoke and lever system for reverse gear. From the present system, yoke of fifth (5th) speed gear comp is used to give input or selection for the reverse gear. In the present system, reverse gear arm receives the selection from yoke of the fifth (5th) speed gear comp where the yoke receives the selection from the same finger/lever of shift tower shaft. In the present system is very simple system in which selection of reverse gear can be made directly from the single shift shaft. The present system is very simple and cost effective.
[0039] Although embodiments for the present subject matter have been described 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 intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.