Claims:1. A mechanism (100) for shifting gears in a multi-speed gearbox of a vehicle, the mechanism (100) comprising:
a pair of shift fingers (10, 11) disposed on a shifter shaft (12), the pair of shift fingers (10, 11) comprising a first shift finger (10) and a second shift finger (11), wherein operation of the shifter shaft (12) correspondingly operates the first shift finger (10) and the second shift finger (11);
a pair of shifter dogs (13, 14) connected to at least one shifter rail of a pair of shifter rails (15, 16), the pair of shifter dogs (13, 14) selectively engage with one of the pair of shift fingers (10, 11) to correspondingly shift gears in the multi-speed gearbox, wherein the pair of shifter dogs (13, 14) comprising:
a first shifter dog (13) connected to one shifter rail of the pair of shifter rails (15, 16), wherein the first shifter dog comprises:
a first pin (21) extending, from a surface of the first shifter dog (13), towards the shifter shaft (12), the first pin (21) is configured to displace the first shifter rail (15) in a first direction (FD) upon selectively engaging with at least one of the first shift finger (10) and the second shift finger (11); and
a second pin (22), extending from the surface of the first shifter dog (13) and offset from the first pin (21), the second pin (22) is configured to displace the first shifter rail (15) in a second direction (SD) upon engaging with the first shift finger (10); and
a second shifter dog (14) connected to an other shifter rail of the pair of shifter rails (15, 16), wherein the second shifter dog comprises;
a third pin (23) extending, from a surface of the second shifter dog (14), towards the shifter shaft (12), the third pin (23) is configured to displace the second shifter rail (16) in the first direction (FD) upon selectively engaging with at least one of the first shift finger (10) and the second shift finger (11), and
a fourth pin (24) extending from the surface of the second shifter dog (14), towards the shifter shaft (12), the fourth pin (24) is configured to displace the second shifter rail (16) in the second direction (SD) upon selectively engaging with at least one of the first shift finger (10) and the second shift finger (11) of the pair of shift fingers (10, 11),
wherein the first pin (21) is defined with a first protrusion (25), laterally projecting from a portion of the first pin (21),
wherein the third pin (23) is defined with a second protrusion (26), laterally projecting from a portion of the third pin (23), and
wherein the first protrusion (25) and the second protrusion (26) are configured to selectively engage with the first shift finger (10) and the second shift finger (11) for correspondingly displacing the first shift rail (15) and the second shift rail (16), to shift gears of the multi-speed gearbox.

2. The mechanism (100) as claimed in claim 1, wherein the first shift finger (10) is rigidly coupled to the shifter shaft (12).

3. The mechanism (100) as claimed in claim 1, wherein the second shift finger (11) is pivotally disposed on the shifter shaft (12) and is configured to relatively displace in a direction opposite to the displacement of the first shift finger (10).

4. The mechanism (100) as claimed in claim 1, wherein length of the first shift finger (10) is greater than length of the second shift finger (11).

5. The mechanism as claimed in claim 1, wherein the first shift finger (10) is defined with a blocking member (17), positioned away from the second shift finger.

6. The mechanism (100) as claimed in claim 5, wherein the blocking member (17) is configured to engage with the third pin (23) and the fourth pin (24) extending form the second shifter dog to restrict engagement of the forward gears during reverse gear engagement.

7. The mechanism (100) as claimed in claim 1, comprises an inversion lever (18) operatively connected to the pair of shift fingers (10, 11), wherein the inversion lever (18) is configured to opposingly displace the second shift finger (11) relative to direction of displacement of the first shift finger (10).

8. The mechanism (100) as claimed in claim 1, wherein the first shifter dog (13) defines a gate portion between the first pin (21) and the second pin (22).

9. The mechanism (100) as claimed in claim 1, wherein the second shifter dog (14) defines a gate portion between the third pin (23) and the fourth pin (24).

10. The mechanism (100) as claimed in claim 1, wherein the first protrusion (25) of the first pin (21) extends below the second protrusion (26) of the third pin (23).

11. The mechanism (100) as claimed in claim 1, wherein displacement of the first shifter rail (15) in the second direction (SD), by the first shift finger, operates reverse gear of the multi-speed gear box.

12. The mechanism (100) as claimed in claim 1, wherein the first protrusion (25) of the first pin (21), the second protrusion (26) of the third pin (23) and the fourth pin (24) are defined along a first plane of operation of each of the first shift finger (10) and the second shift finger (11).

13. The mechanism (100) as claimed in claim 1, wherein the first pin (21) is defined along a second plane, the second plane is being parallel to the first plane and is downstream of the first plane relative to the movement of the shifter shaft (12).

14. The mechanism (100) as claimed in claim 1, wherein the third pin (23) is defined along a third plane, the third plane is being parallel to the first plane and aligned away from the second plane, the third plane is upstream of the first plane relative to the movement of the shifter shaft (12).

15. The mechanism (100) as claimed in claim 12, wherein movement of the first shift finger (10) in the first direction (FD) and the second direction (SD) along the first plane engages with the first protrusion (25) in the first pin (21) and the fourth pin (24) respectively, to correspondingly displace the first shifter rail (15) in the first direction (FD) and the second shifter rail (16) in the second direction (SD).

16. The mechanism (100) as claimed in claim 12, wherein the movement of the second shift finger (11) in the first direction (FD) and the second direction (SD) along the first plane engages with the second protrusion (26) in the third pin and the fourth pin (24) respectively, to correspondingly displace the second shifter rail (16) in the first direction (FD) and the second direction (SD).

17. The mechanism (100) as claimed in claim 12, wherein the movement of the second shift finger (11) in the second plane engages with the first pin (21) to displace the first shifter rail (15) in the first direction (FD) for engaging the forward gears.

18. The mechanism (100) as claimed in claim 12, wherein the movement of the first shift finger (10) in the third plane engages with the third pin (23) to displace the second shifter rail (16) in the first direction (FD) for engaging the forward gears.

19. The mechanism (100) as claimed in claim 1, wherein the multi-speed gearbox is a 12-speed gearbox, operable in a double-H gear shift layout.

20. A gear shifting assembly (200) for a multi-speed gearbox of a vehicle, the assembly (200) comprising:
a shift lever (19) disposed in a passenger cabin of the vehicle;
a shifter shaft (12) operably coupled to the shift lever (19); and
a mechanism (100) for shifting gears in multi-speed gearbox of a vehicle, the mechanism (100) comprising:
a pair of shift fingers (10, 11) disposed on the shifter shaft (12), the pair of shift fingers (10, 11) comprising a first shift finger (10) and a second shift finger (11), wherein operation of the shifter shaft (12) correspondingly operates the first shift finger (10) and the second shift finger (11);
a pair of shifter dogs (13, 14) connected to at least one shifter rail of a pair of shifter rails (15, 16), the pair of shifter dogs (13, 14) selectively engage with one of the pair of shift fingers (10, 11) to correspondingly shift gears in the multi-speed gearbox, wherein the pair of shifter dogs (13, 14) comprising:
a first shifter dog (13) connected to one shifter rail of the pair of shifter rails (15, 16), wherein the first shifter dog comprises:
a first pin (21) extending, from a surface of the first shifter dog (13), towards the shifter shaft (12), the first pin (21) is configured to displace the first shifter rail (15) in a first direction (FD) upon selectively engaging with at least one of the first shift finger (10) and the second shift finger (11); and
a second pin (22), extending from the surface of the first shifter dog (13) and off-set from the first pin (21), the second pin (22) is configured to displace the first shifter rail (15) in a second direction (SD) upon engaging with the first shift finger (10); and
a second shifter dog (14) connected to an other shifter rail of the pair of shifter rails (15, 16), wherein the second shifter dog comprises;
a third pin (23) extending, from a surface of the second shifter dog (14), towards the shifter shaft (12), the third pin (23) configured to displace the second shifter rail (16) in the first direction (FD) upon selectively engaging with at least one of the first shift finger (10) and the second shift finger (11), and
a fourth pin (24) extending from the surface of the second shifter dog (14), towards the shifter shaft (12), the fourth pin (24) configured to displace the second shifter rail (16) in the second direction (SD) upon selectively engaging with at least one of the first shift finger (10) and the second shift finger (11) of the pair of shift fingers (10, 11),
wherein the first pin (21) is defined with a first protrusion (25), laterally projecting from a portion of the first pin (21),
wherein the third pin (23) is defined with a second protrusion (26), laterally projecting from a portion of the third pin (23), and
wherein the first protrusion (25) and the second protrusion (26) are configured to selectively engage with the first shift finger (10) and the second shift finger (11) for correspondingly displace the first shift rail (15) and the second shift rail (16), to shift gears of the multi-speed gearbox, and
wherein the first protrusion (25) and the second protrusion (26) are configured to selectively engage with the first shift finger (10) and the second shift finger (11) for correspondingly displacing the first shift rail (15) and second shift rail (16), to shift gears of the multi-speed gearbox; and
plurality of shifter forks (27, 28) operably coupled to each of the pair of shifter rails (15, 16) and are configured to engage a corresponding gear based on movement.

21. The assembly (200) as claimed in claim 18, comprises an inversion lever (18) operatively connected to the pair of shift fingers (10, 11), wherein the inversion lever (18) is configured to opposingly displace the second shift finger (11) relative to direction of displacement of the first shift finger (100.

22. The assembly (200) as claimed in claim 20, comprises a guide plate (20) disposed over the shifter shaft (12), wherein the first shift finger (10), the second shift finger (11) and the inversion lever (18) are housed within the guide plate (20).

23. The assembly (200) as claimed in claim 20, wherein the multi-speed gearbox is a 12-speed gearbox, operable in a double-H gear shift layout.

24. The assembly (200) as claimed in claim 20, wherein displacement of the first shifter rail (15) and the second shifter rail (15) in the first direction (FD) operates forward gears of the multi-speed gear box.

25. The assembly (200) as claimed in claim 20, wherein displacement of the first shifter rail (15) in the second direction (SD) operates reverse gear of the multi-speed gear box.

26. The assembly (200) as claimed in claim 20, wherein displacement of the second shifter rail (16) in the second direction (SD) operates forward gears of the multi-speed gearbox.

27. A vehicle comprising a mechanism (100) for shifting gears in a multi-speed gearbox as claimed in claim 1.
, Description:TECHNICAL FIELD:

The present disclosure, in general, relates to automobiles. Particularly, but not exclusively, the present disclosure relates to a multi-speed gearbox of a vehicle. Further, embodiments of the present disclosure disclose a mechanism for shifting gears in the multispeed gearbox with a double-H shift layout.

BACKGROUND OF THE DISCLOSURE:

Generally, a multi-speed gearbox for a vehicle such as 12-speed gearbox is defined with 2×3×2 construction, where such gearbox consists of a 2-speed split section, 3-speed drive section and a rear-mounted 2-speed sun-planetary or bull gear range section. The 2-speed split section may be provisioned, to operate the gears in different ranges i.e. between low range and high range and the rear-mounted 2-speed sun-planetary or bull gear range section may be provisioned to vary the torque transmitted by the 3-speed drive section. Each section of the gearbox may be automatically shifted [for example, by pneumatically controlled shifting means] or manually shifted [for example, by mechanically actuated shifting means]. In such gearboxes, the 2-speed split section and rear-mounted 2-speed sun-planetary or bull gear range section are usually pneumatically actuated whereas the 3-speed drive section is manually shifted.

Further, manually shifting 3-speed drive section may be defined with a predetermined shifting layout, for operating the multi-speed gearbox. For actuating the manually shifting 3-speed drive section, a shift lever which is associated with the multi-speed gearbox, may be suitably displaced about the predetermined shifting layout, for actuating different gears, and in-turn different gear ratios, in the multi-speed gearbox. The predetermined shifting layout for displacement of the shifter lever may be dependent on various factors including, but not limited to, number of operating gears [including reverse gear], positioning of gear-pairs within the multi-speed gearbox, number of layshafts for operating the gears, and the like.

Conventionally, for shifting between different gears in a 12-speed gearbox, the shifting layout for the shift lever may be as shown in any one of Figures 1a and 1b. in such conventional shifting layouts, the shifting lever may have to be toggled between multiple rails for suitably actuating different gears of the multi-speed gearbox. Further, to engage different gears of the 12-speed gearbox, the shift lever may be displaceable to engage different rails associated with shifting means coupled to the 12-speed gearbox. As seen in Figure 1a, a reverse gear and 1st gear may either be positioned along one rail, for example a first rail, while as shown in Figure 1b, the rear gear and the 1st gear may be positioned on different rails for engagement. Subsequently, based on positioning of the reverse and 1st gear, other gears such as, 2nd gear to 6th gear may be positioned in the shifting layout.

As can be seen in Figures 1a and 1b, the shifting layout may get complex for accommodating the six-forward gears and the reverse gear along with the sun-planetary or bull gear range gears, for operating the 12-speed gearbox. Particularly, the arrangement for shifting the gears in the 12-speed gearbox may get complex, whereby additional shift rails may be employed for engagement with the shift lever. The shift lever may be displaced in different planes for engaging with different shift rails, where corresponding direction of displacement of the shift lever along the shift rail may be configured to operate corresponding gears of the 12-speed gearbox. However, with conventional shifting layouts, due to complex arrangements a shift between the shift rails [or shift in operation plane] may be required for operating from 3rd gear to 4th gear in the gear shifting arrangement. Due to such shift in plane or changing the shifting rail, the shift lever may institute a shift blank in operation for engagement from gears corresponding to 2nd gear to 5th gear, as best seen in Figures 1a and 1b. That is, a non-engageable space may be developed in operation between sequential shifting of gears from 2nd gear to 5th gears in the shifting layout, thereby rendering movement sequence of the shift lever complex for an operator [or also referred to as user] of the vehicle. Also, such shift blanks may inherently perplex the operator during quick shifting of the gears for applications including, but not limited to, down shift for braking applications, retardation of the vehicle, and the like, which may inadvertently cause loss of control over the vehicle.

The present disclosure is directed to overcome one or more limitations stated above or any other limitation associated with the conventional arts.

SUMMARY OF THE DISCLOSURE:

One or more shortcomings of the prior art are overcome by a mechanism and an assembly as claimed and additional advantages are provided through the provision of the mechanism as claimed in the present disclosure. Additional features and advantages are realized through the aspects and techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

In an exemplary embodiment of the present disclosure, a mechanism for shifting gears in a multi-speed gearbox of a vehicle is disclosed. The mechanism includes a pair of shift fingers disposed on a shifter shaft. The pair of shift fingers consists of a first shift finger and a second shift finger, where operation of the shifter shaft correspondingly operates the first shift finger and the second shift finger. Further, the mechanism consists of a pair of shifter dogs connected to at least one of a pair of shifter rails. The pair of shifter dogs are configured to selectively engage with one of the pair of shift fingers to correspondingly shift gears in the multi-speed gearbox. The pair of shifter dogs consisting of a first shifter dog connected to one of the pair of shifter rails and a second shifter dog connected to another of the pair of shifter rails. The first shifter dog includes a first pin extending, from a surface of the first shifter dog, towards the shifter shaft. The first pin is configured to displace the first shifter rail in a first direction on selectively engaging with at least one of the first shift finger and the second shift finger. The first pin is also defined with a first protrusion, laterally projecting from a portion of the first pin. The first shifter dog also includes a second pin extending from the surface of the first shifter dog and, off-set from the first pin, the second pin is configured to displace the first shifter rail in a second direction on engaging with the first shift finger. Further, the second shifter dog includes a third pin extending, from a surface of the second shifter dog, towards the shifter shaft. The third pin is configured to displace the second shifter rail in the first direction on selectively engaging with at least one of the first shift finger and the second shift finger. The fourth pin is defined with a second protrusion, laterally projecting from a portion of the third pin. The second shifter dog also includes a fourth pin extending from the surface of the second shifter dog, towards the shifter shaft. The fourth pin is configured to displace the second shifter rail in the second direction on selectively engaging with at least one of the first shift finger and the second shift finger of the pair of shift fingers. Additionally, the first protrusion and the second protrusion are configured to selectively engage with the first shift finger and the second shift finger for correspondingly displace the first shift rail and second shift rail to shift gears of the multi-speed gearbox.

In an embodiment, the first shift finger is rigidly coupled to the shifter shaft, while the second shift finger is pivotally disposed on the shifter shaft. The second shift finger is configured to relatively displace in a direction opposite to the displacement of the first shift finger.

In an embodiment, length of the first shift finger is greater than length of the second shift finger.

In an embodiment, the first shift finger is defined with a blocking member, positioned away from the second shift finger. The blocking member is configured to engage with the plurality of actuation pins extending form the second shifter dog to restrict engagement of the forward gears opposite to the reverse gear engagement, as the blocking member blocks the movement of the first shift finger in the forward direction.

In an embodiment, an inversion lever is operatively connected to the pair of shift fingers, where the inversion lever is configured to opposingly displace the second shift finger relative to direction of displacement of the first shift finger.

In an embodiment, the first shifter dog defines a gate portion between the first pin and the second pin.

In an embodiment, the second shifter dog defines a gate portion between the third pin and the fourth pin.

In an embodiment, the first protrusion of the first pin extends below the second protrusion of the third pin.

In an embodiment, displacement of the first shifter rail in the second direction operates reverse gear of the multi-speed gear box.

In an embodiment, the first protrusion of the first pin, the second protrusion of the third pin and the fourth pin are defined along a first plane of operation of each of the first shift finger and the second shift finger.

In an embodiment, the first pin is defined along a second plane, where the second plane is being parallel to the first plane and is downstream of the first plane relative to the movement of the shifter shaft.

In an embodiment, the third pin is defined along a third plane, the third plane is being parallel to the first plane and aligned away from the second plane, the third plane is upstream of the first plane relative to the movement of the shifter shaft.

In an embodiment, movement of the first shift finger in the first direction and the second direction along the first plane correspondingly engages with the first protrusion in the first pin and the fourth pin to correspondingly displace the first shifter rail in the first direction and the second shifter rail in the second direction, respectively.

In an embodiment, the movement of the second shift finger in the first direction and the second direction along the first plane correspondingly engages with the second protrusion and the fourth pin to correspondingly displace the second shifter rail in the first direction and the second direction, respectively.

In an embodiment, movement of the second shift finger in the first direction along the second plane engages with the first pin to displace the first shifter rail in the first direction.

In an embodiment, movement of the first shift finger in the second direction in the third plane engages with the third pin to displace the second shifter rail in the first direction.

In an embodiment, the multi-speed gearbox is a 12-speed gearbox, operable in a double-H gear shift layout.

In another non-limiting embodiment of the disclosure, a gear shifting assembly for a multi-speed gearbox is disclosed. The assembly consists of a shift lever disposed in a passenger cabin of the vehicle, a shifter shaft operably coupled to the shift lever and a mechanism for shifting gears in a multi-speed gearbox of a vehicle is disclosed. The mechanism includes a pair of shift fingers disposed on the shifter shaft. The pair of shift fingers consists of a first shift finger and a second shift finger, where operation of the shifter shaft correspondingly operates the first shift finger and the second shift finger. Further, the mechanism consists of a pair of shifter dogs connected to at least one of a pair of shifter rails. The pair of shifter dogs are configured to selectively engage with one of the pair of shift fingers to correspondingly shift gears in the multi-speed gearbox. The pair of shifter dogs consisting of a first shifter dog connected to one of the pair of shifter rails and a second shifter dog connected to another of the pair of shifter rails. The first shifter dog includes a first pin extending, from a surface of the first shifter dog, towards the shifter shaft. The first pin is configured to displace the first shifter rail in a first direction on selectively engaging with at least one of the first shift finger and the second shift finger. The first pin is also defined with a first protrusion, laterally projecting from a portion of the first pin. The first shifter dog also includes a second pin extending from the surface of the first shifter dog and, off-set from the first pin, the second pin is configured to displace the first shifter rail in a second direction on engaging with the first shift finger. Further, the second shifter dog includes a third pin extending, from a surface of the second shifter dog, towards the shifter shaft. The third pin is configured to displace the second shifter rail in the first direction on selectively engaging with at least one of the first shift finger and the second shift finger. The fourth pin is defined with a second protrusion, laterally projecting from a portion of the third pin. The second shifter dog also includes a fourth pin extending from the surface of the second shifter dog, towards the shifter shaft The fourth pin is configured to displace the second shifter rail in the second direction on selectively engaging with at least one of the first shift finger and the second shift finger of the pair of shift fingers. Additionally, the first protrusion and the second protrusion are configured to selectively engage with the first shift finger and the second shift finger for correspondingly displace the first shift rail and second shift rail to shift gears of the multi-speed gearbox. The assembly also consists of plurality of shifter forks operably coupled to each of the pair of shifter rails and are configured to engage a corresponding gear based on movement.

In an embodiment, displacement of the first shifter rail and the second shifter rail in the first direction operates forward gears of the multi-speed gear box.

In an embodiment, displacement of the first shifter rail in the second direction operates reverse gear of the multi-speed gear box.

In an embodiment, displacement of the second shifter rail in the second direction operates forward gears of the multi-speed gearbox.

It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS:

The novel features and characteristics of the disclosure are set forth in the description. The disclosure itself, however, as well as a preferred mode of use, further advantages thereof, will best be understood by reference to the following description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of example only, with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:

Figures. 1a and 1b illustrates a schematic view of conventional shift pattern of gears in a multi-speed gearbox.

Figure 2 illustrate a schematic perspective view of a gear shifting assembly for a multi-speed gearbox, in accordance with an embodiment of the present disclosure.

Figure 3 illustrates an exploded view of a pair of shift fingers of gear shifting assembly of Figure. 2 assembled in a guide plate, in accordance with an embodiment of the present disclosure.

Figure 4 illustrates a schematic view of the pair of shift fingers of Figure 3 mounted on a shifter shaft of the gear shifting assembly, in accordance with an embodiment of the present disclosure.

Figure 5 illustrates a schematic perspective view of a pair of shifter dogs connected to a pair of shifter shafts of the gear shifting assembly, in accordance with an embodiment of the present disclosure.

Figure 6 illustrate a schematic view of a mechanism for shifting gears of the multi-speed gearbox, in accordance with an embodiment of the present disclosure.

Figures 7a-7d illustrate a shifting layout showing position of shift fingers relative to corresponding position of pins in the pair of shifter dogs, in accordance with an embodiment of the present disclosure.

Figure 8a illustrates operation of the mechanism for engaging reverse gear corresponding to the position of the shift lever in the double-H shift layout.

Figure 8b illustrates operation of the mechanism for engaging 1st gear corresponding to the position of the shift lever in the double-H shift layout.

Figure 8c illustrates operation of the mechanism for engaging 2nd gear corresponding to the position of the shift lever in the double-H shift layout.

Figure 8d illustrates operation of the mechanism for engaging 3rd gear corresponding to the position of the shift lever in the double-H shift layout.

Figure 8e illustrates operation of the mechanism for engaging 4th gear corresponding to the position of the shift lever in the double-H shift layout.

Figure 8f illustrates operation of the mechanism for engaging 5th gear corresponding to the position of the shift lever in the double-H shift layout.

Figure 8g illustrates operation of the mechanism for engaging 6th gear corresponding to the position of the shift lever in the double-H shift layout.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the mechanism and assembly illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION OF THE DISCLOSURE:

The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that, the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other mechanism or assembly for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, 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. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that an assembly, mechanism or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or mechanism or assembly. In other words, one or more elements in a mechanism or assembly proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the mechanism or assembly.

Embodiments of the present disclosure relates to a gear shifting assembly having a mechanism for shifting gears in a multi-speed gearbox of a vehicle. The multi-speed gearbox may be a 12-speed gearbox, operable in a double-H gear shift layout. Here, the mechanism includes a pair of shift fingers disposed on a shifter shaft. The pair of shift fingers consists of a first shift finger and a second shift finger, where operation of the shifter shaft correspondingly operates the first shift finger and the second shift finger. Further, the mechanism consists of a pair of shifter dogs connected to at least one of a pair of shifter rails. The pair of shifter dogs are configured to selectively engage with one of the pair of shift fingers to correspondingly shift gears in the multi-speed gearbox. The pair of shifter dogs consisting of a first shifter dog connected to one of the pair of shifter rails and a second shifter dog connected to an other of the pair of shifter rails. The first shifter dog includes a first pin extending, from a surface of the first shifter dog, towards the shifter shaft. The first pin is configured to displace the first shifter rail in a first direction on selectively engaging with at least one of the first shift finger and the second shift finger. The first pin is also defined with a first protrusion, laterally projecting from a portion of the first pin. The first shifter dog also includes a second pin extending from the surface of the first shifter dog and, off-set from the first pin, the second pin is configured to displace the first shifter rail in a second direction on engaging with the first shift finger. Further, the second shifter dog includes a third pin extending, from a surface of the second shifter dog towards the shifter shaft. The third pin is configured to displace the second shifter rail in the first direction on selectively engaging with at least one of the first shift finger and the second shift finger. The third pin is defined with a second protrusion, laterally projecting from a portion of the third pin. The second shifter dog also includes a fourth pin extending from the surface of the second shifter dog, towards the shifter shaft The fourth pin is configured to displace the second shifter rail in the second direction on selectively engaging with at least one of the first shift finger and the second shift finger of the pair of shift fingers. Additionally, the first protrusion and the second protrusion are configured to selectively engage with the first shift finger and the second shift finger for correspondingly displacing the first shift rail and second shift rail to shift gears of the multi-speed gearbox. Thus, the mechanism in the gear shifting assembly allows a user to shift between gears of the multi-speed gearbox in a double-H layout, thereby reducing prelesion in shifting gears of the vehicle.

Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible, same numerals will be used to refer to the same or like parts. The following paragraphs describe the present disclosure with reference to Figures 2 to 8. Also, the mechanism and the assembly may be employable in vehicles including, but not limited to, heavy-duty vehicles a commercial vehicles, and the like, for shifting gears, to drive such vehicle.

Figure 2 is an exemplary embodiment of the disclosure which illustrates a gear shifting assembly (200) for a vehicle [not shown in Figures]. The gear shifting assembly (200) may be positioned at floor level of a passenger compartment in the vehicle. The gear shifting assembly (200) may be cascaded in a housing [not shown in Figures] for providing a compact and robust operating experience for an operator [or interchangeably referred to as a user or a driver]. The gear shifting assembly (200) includes a shift lever (19), which is disposed in the passenger cabin of the vehicle, for the operator to suitably engage different gears based on requirement. The requirements for engaging and/or changing gears may be including, but not limited to, speed requirements, torque requirement, enhancing load bearing capacity, and the like. Referring to Figure 4, the shift lever (19) is coupled to a shifter shaft (12), by means such as, but not limited to, welding, brazing, fastening, and the like. The shift lever (19) may be coupled to the shifter shaft (12) such that, displacement [either horizontal or vertical] of the shift lever may displace [rotationally and either longitudinally or transversely] the shifter shaft (12), based on nature of connection. Displacement of the shifter shaft (12) may be either proportional or inverse to direction of the shift lever (19) and may accordingly define a shifting layout for engaging gears of the gear assembly.

In an embodiment, the shift lever (19) is configured to protrude into the cabin of the vehicle such that the user operates the shift lever (19) for shifting between gears. The shift lever (19) is disposed in a passenger cabin of the vehicle and operative by the user through linkages or a cable shift mechanism (not shown in figures). That is, the shift lever (19) may be connected to the shifter shaft (12) through linkages or cables so that, the displacement of the shift lever (19) is effectively transmitted to the shifter shaft (12).

Further referring to Figure 2, the gear shifting assembly (200) includes a mechanism (100) for shifting between gears in the multi-speed gearbox of the vehicle. The mechanism (100) includes a pair of shift fingers (10, 11), disposed on the shifter shaft (12), where displacement [transverse or rotational movement] of the shifter shaft is configured to correspondingly displace [lateral or rotational movement] each of the pair of shift fingers (10, 11) [refer to Figure 4]. The mechanism (100) further includes a pair of shifter dogs (13, 14) each connected to at least one shifter rail of a pair of shifter rails (15, 16). The pair of shifter rails (15, 16) include a first shifter rail (15) and a second shifter rail (16). Additionally, the gear shifting assembly (200) includes plurality of shifter forks (27, 28) operably coupled to each of the pair of shifter rails (15, 16). The plurality of shifter forks (27, 28) consists of a first shifter fork (27) and a second shifter fork (28). In an embodiment, the first shifter fork (27) is coupled to the first shifter rail (15) and the second shifter fork (28) is connected to the second shifter rail (16). The plurality of shifter forks (27, 28) are adapted to change the gears in the gearbox of the vehicle based on the inputs received from the pair of shifter rails (15, 16).

In an embodiment, the first shifter rail (15) and the second shifter rail (16) are substantially parallel to each other.

Referring now to Figure 3, the mechanism (100) consists a guide plate (20) disposed over the shifter shaft (12). The guide plate (20) is configured to house the pair of shift fingers (10, 11). The pair of shift fingers (10, 11) consists of a first shift finger (10) and a second shift finger (11), that may be disposable on the shifter shaft (12). Each of the first shift finger (10) and the second shift finger (11) are defined with a cavity at for accommodating and connecting with the shifter shaft (12). Additionally, a groove is defined on one side of the first shift finger (10) so that, a dowel (30) may be fixed in the groove to rigidly connect the first shift finger (10) over the shifter shaft (12) [refer to Figure 4]. Due to such rigid connection, movement [longitudinal or rotational movement] of the shifter shaft (12) may be directly transmitted onto the first shift finger (10). In an embodiment, the second shift finger (11) may be disposed on the shifter shaft (12) such that, the second shift finger (11) may be free to rotate on shifter shaft (12). Further, the first shift finger (10) and the second shift finger (11) are also defined with actuating portions.

Further, the mechanism includes an inversion lever (18) which is positioned between the actuations portion of the first shift finger (10) and the second shift finger (11). The inversion lever (18) is operatively connected to the pair of shift fingers (10, 11). The inversion lever (18) includes an elongated member, defined with at least two teeth extending from opposite sides of the elongated member. In an embodiment, one tooth of the at least two teeth of the inversion lever (18) is configured to engage with the actuation portion of the first shift finger (10) and the actuation portion of the second shift finger (11). The inversion lever (18) is configured to opposingly displace the second shift finger (11) relative to the direction of displacement of the first shift finger (10), upon displacement of the shifter shaft. In an embodiment, the inversion lever (18) is held in place within the guide plate (20) by fastening the inversion lever (18) to the guide plate (20) by a suitable fastener (29).

In an embodiment, as the user operates the shift lever (19), the shifter shaft (12) rotates on resulting in rotation of the first shift finger (10) as the first shift finger (10) is rigidly connected to the shifter shaft (12). Further, as the inversion lever (18) is disposed between the first shift finger (10) and the second shift finger (11) and is connected to each of the first and the second shift finger (11), the second shift finger (11) rotates in the opposite direction relative to the rotation of the first shift finger (10).

In an embodiment, the first shift finger (10) is longer than the second shift finger (11). For example, the dimension of the first shift finger (10) in length is greater than the dimension of the second shift finger (11).

In an embodiment, the first shift finger (10) and the second shift finger (11) are defined with engaging portions that extend away from the shifter shaft (12) and in a direction towards the pair of shifter dogs (13, 14). The engaging portions of the first shift finger (10) and the second shift finger (11) are configured to selectively engage with a portion of the pair of shifter dogs (13, 14) to shift gears in the multi-speed gearbox. Furthermore, the actuating portions defined on the first shift finger (10) and the second shift finger (11) are in a direction opposite to that of the engaging portions.

In an embodiment, the first shift finger (10) further includes a blocking member (17). The blocking member (17) is positioned on a side of the first shift finger (10) that is away and opposite from the second shift finger (11). The blocking member (17) may have a triangular profile, square profile, pentagonal profile, hexagonal profile and the like.

Figure 5 is an exemplary embodiment of the disclosure illustrating the pair of shifter dogs (13, 14) connected to the pair of shifter rails (15, 16). The pair of shifter dogs (13, 14) consists of a first shifter dog (13) and a second shifter dog (14). The first shifter dog (13) is connectable to the first shifter rail (15) of the pair of shifter rails (15, 16) and the second shifter dog (14) is connectable to the second shifter rail (16) of the pair of shifter rails (15, 16). The first shifter dog (13) and the second shifter dog (14) are connected to the first shifter rail (15) and the second shifter rail (16) by means including but not limited to, welding, brazing, adhesive bonding, fastening, snap locking, and the like. In an embodiment, the pair of shifter dogs (13, 14) are defined with a cavity in the center portion of the pair of shifter dogs (13, 14) to accommodate the pair of shifter rails (15, 16).

In an embodiment, the first shifter dog (13) consists of a first pin (21) extending from a surface of the first shifter dog (13) towards the shifter shaft (12) and, a second pin (22) extending from the surface of the first shifter dog (13) and offset from the first pin (21). The first pin (21) is defined with a first protrusion (25), that laterally projects from a portion of the first pin (21).

In an embodiment, the first pin (21) may be profiled to resemble ‘L-shape’ or ‘inverted J-shape’ and may be configured to operate the first shift rail (15) to engage a first gear and a fourth gear, based on direction of force application on the first pin (21) by one of the pair of shift fingers (10, 11). The first gear is associated with the laterally extending first protrusion (25) of the first pin (21) and the fourth gear is associated with a top portion of the first pin (21). Further, the second pin (22) is configured to engage a reverse gear upon movement

In an embodiment, the first shifter dog (13) defines a gate portion between the first pin (21) and the second pin (22) to accommodate lateral movement of the pair of shift fingers (10, 11).
In an embodiment, the second shifter dog (14) consists of a third pin (23) extending from a surface of the second shifter dog (14) towards the shifter shaft (12). Further, the second shifter dog (14) consists of a fourth pin (24) extending from the surface of the second shifter dog (14) towards the shifter shaft (12). Further, the third pin (23) is defined with a second protrusion (26), that laterally projects from the third pin (23). In an embodiment, the first protrusion (25) of the first pin (21) extends below the second protrusion (26) of the third pin (23). In an embodiment, the first protrusion (25) is defined at the bottom portion of the first pin (21) and projects towards the second shifter dog (14). The second protrusion (26) is defined top portion of the third pin (23) and projects towards the first shifter dog (13). In an embodiment, the third pin (23) resembles an inverted L-shape’ or ‘half T-shape’ and is configured to engage third and sixth gear upon movement. The third gear is associated with the bottom portion of the third pin (23) and the sixth gear is associated with the laterally extending second protrusion (26) of the third pin. In an embodiment, the fourth pin (24) is configured to engage second and fifth gear upon movement. The second gear is associated with the bottom portion of the fourth pin (24) and the fifth gear is associated with the top portion of the fourth pin.

In an embodiment, the length of the second pin (22) is shorter than the lengths of the first pin (21), the third pin (23) and the fourth pin (24).
In an embodiment, the lengths of the first pin (21), the third pin (23) and the fourth pin (24) are substantially equal.

In an embodiment, the second shifter dog (14) defines a gate portion between the third pin (23) and the fourth pin (24) to accommodate lateral movement of the pair of shift fingers (10, 11).

In an embodiment, the first protrusion (25) of the first pin (21), the second protrusion (26) of the third pin (23) and the fourth pin (24) are defined along a first plane of operation of each of the first shift finger (10) and the second shift finger (11). Further, in an embodiment, the first pin (21) is defined along a second plane where the second plane is parallel to the first plane and is downstream of the first plane relative to the movement of the shifter shaft (12). Furthermore, the third pin (23) is defined along a third plane where the third plane is parallel to the first plane and aligned away from the second plane. The third plane is defined upstream of the first plane relative to the movement of the shifter shaft (12).

Furthermore, the first protrusion (25) and the second protrusion (26) are configured to selectively engage with the first shift finger (10) and the second shift finger (11) for correspondingly displacing the first shift rail (15) and the second shift rail (16), to shift the forward gears of the multi-speed gearbox.

The blocking member (17) is configured to restrict movement of the third pin (23) and the fourth pin (24) when the first shift finger (10) engages with the second pin (22) to engage the reverse gear.
Further as can be seen in Figure 5 and Figure 6 the movement of the first shift finger (10) in a first direction (FD) and a second direction (SD) along the first plane engages with the first protrusion (25) in the first pin (21) and the fourth pin (24) respectively. This engagement of the first shift finger (10) with the first protrusion (25) and the fourth pin (24) correspondingly displaces the first shifter rail (15) in the first direction (FD) and the second shifter rail (16) in the second direction (SD). In an embodiment, the movement of the second shift finger (11) in the first direction (FD) and the second direction (SD) along the first plane engages with the second protrusion (26) in the third pin (23) and the fourth pin (24) respectively. This engagement correspondingly displaces the second shifter rail (16) in the first direction (FD) and the second direction (SD). In an embodiment, the movement of the second shift finger (11) in the second plane engages with the first pin (21) to displace the first shifter rail (15) in the first direction (FD) for engaging the forward gears. In an embodiment, the movement of the first shift finger (10) in the third plane engages with the third pin (23) to displace the second shifter rail (16) in the first direction (FD) for engaging the forward gears.

In an embodiment, the displacement of the first shifter rail (15) in the second direction (SD) by the first shift finger (10) operates the reverse gear of the multi-speed gear box.

Figures 7a-7d are exemplary embodiments of the disclosure illustrating positions of the pair of shift fingers (10, 11) along the double-H shift layout for operating different gears in the multi-speed gearbox. In the illustrative embodiment, the multi-speed gearbox may be a 12-speed gearbox, having six-drive gears along with a 2-speed split section, which may be operable to vary torque and/or speed output from the 12-speed gearbox. The 12-speed gearbox, along with the six-drive gears, may include a reverse gear, for reverse driving of the vehicle. Each of the gears, that is, the six drive gears and the reverse gear may be operable based on operational displacement of the shift lever (19). The shift lever (19) may be configured to correspondingly operate the pair of shift fingers (10, 11) to selectively engage with one of the shifter dogs of the pair of shifter dogs (13, 14) connected to the pair of shift rails (15, 16). Further, the double-H shift layout consists of four sections, namely first section, second section, third section and the fourth section. The first section is defined in the left most region out of the double-H shift layout and is configured to allow the shift lever (19) to engage the reverse gear. The second section is defined in the left region of the double-H shift layout and is configured to allow the shift lever (19) to engage between the first gear and the second gear. The third section is defined at the center of the double-H shift layout and is configured to allow the shift lever (19) to engage between the third gear and the fourth gear. The fourth section is defined at the right-side region of the double-H shift layout and is configured to allow the shift lever (19) to engage between the fifth gear and the sixth gear.

Referring to Figure 7a, for operating the shift lever (19) and engaging reverse gear, the shift lever (19) may be displaced to the first section in the gear shift layout. Upon displacing the shift lever (19) to the first section the pair of shift fingers (10, 11) displace laterally towards the second pin (22) in the gate defined by the pair of shifter dogs (13, 14). The lateral displacement of the pair of shift fingers (10, 11) results the first shift finger (10) being positioned in line with the second pin (22) to further engage the reverse gear. In an embodiment, the second pin (22) may be defined in a fourth plane as the second pin (22) is at an offset from the first pin (21) and hence the fourth plane is also offset from the second plane of the first pin (21).

Referring to Figure 7b, during operation of the first gear or the second gear, the shift lever (19) is displaced to a second section in the gear shift layout where forward actuation of the shift lever (19) engages the first gear and backward actuation of the shift lever (19) engages the second gear. Upon displacing the shift lever (19) to the second section, the pair of shift fingers (10, 11) displace laterally and the first shift finger (10) gets positioned in the first plane. In an embodiment, even when the first shift finger (10) is positioned in the first plane the second shift finger (11) is positioned away from any of the pins which are extending from the pair of shifter dogs (13, 14).

Referring to Figure 7c, during operation of the third gear or the fourth gear, the shift lever (19) is displaced to a third section in the gear shift layout where forward actuation of the shift lever (19) engages the third gear and backward actuation of the shift lever (19) engages the fourth gear. Upon displacing the shift lever (19) to the third section, the pair of shift fingers (10, 11) displace laterally and the first shift finger (10) gets positioned in the third plane, whereas the second shift finger (11) gets positioned in the second plane. The second shift finger (11) upon getting positioned in the second plane, does not engage with the second pin (22) as the second pin (22) is offset form the first pin and as the height of the second pin (22) is less when compared with the first pin (21). Further, as the second shift finger (11) is shorter than the first shift finger (10) the engagement between the second pin (22) and the second shift finger (11) is not possible.

Referring now to Figure 7d, during operation of the fifth gear or the sixth gear, the shift lever (19) is displaced to a fourth section where forward actuation of the shift lever (19) engages the fifth gear and backward actuation of the shift lever (19) engages the sixth gear. Upon displacing the shift lever (19) to the fourth section, the pair of shift fingers (10, 11) displace laterally and the first shift finger (10) gets positioned away from any of the pins extending from the pair of shifter dogs (13, 14), whereas the second shift finger (11) gets positioned in the first plane.
Further referring back to Figure 6, the pair of shifter rails (15, 16) are configured to displace upon displacement of the pair of shifter dogs (13, 14). The displacement of the first shifter dog (13) displaces the first shifter rail (15) and the displacement of the second shifter dog (14) displaces the second shifter rail (16). The first shifter rail (15) and the second shifter rail (16) are configured to displace in the first direction (FD) and the second direction (SD). In an embodiment, the pair of shift fingers (10, 11) engage with the pins extending from the surface of the pair of shifter dogs (13, 14) to transmit the force or movement from the shifter lever (19) to the first and the second shifter dog (14). Further, the displacement of the first shifter rail (15) and the second shifter rail (16) in the first direction (FD) operates forward gears of the multi-speed gear box. In an embodiment, the displacement of the second shifter rail (16) in the second direction (SD) operates forward gears of the multi-speed gearbox. Further, in an embodiment, the displacement of the first shifter rail (15) in the second direction (SD) operates reverse gear of the multi-speed gear box.

In an embodiment, movement of the first shifter rail (15) in the first direction (FD) engages one of the first or the fourth gears. The movement of the first shifter rail (15) in the second direction (SD) engages the reverse gear. In an embodiment, the movement of the second shifter rail (16) in the first direction (FD) engages one of the third and the sixth gears. Further, movement of the second shifter rail (16) in the second direction (SD) engages one of the second and the fifth gears.

In an embodiment, the first pin (21) is configured to displace the first shifter rail (15) in a first direction (FD) on selectively engaging with at least one of the first shift finger (10) and the second shift finger (11). The second pin (22) is configured to displace the first shifter rail (15) in a second direction (SD) on engaging with the first shift finger (10). The third pin (23) is configured to displace the second shifter rail (16) in the first direction (FD) on selectively engaging with at least one of the first shift finger (10) and the second shift finger (11). The fourth pin (24)is configured to displace the second shifter rail (16) in the second direction (SD) on selectively engaging with at least one of the first shift finger (10) and the second shift finger (11) of the pair of shift fingers (10, 11).

Further, the multi-speed gearbox consists of 12-speeds which are achieved by splitting the six forward gears into high and low with the help of a 2-speed sun-planetary range section. Further, the six forward gears are actuated by actuating the first, second and third gears of 3-speed drive section and then shifting the range by actuating the 2-speed sun-planetary range section. The 2-speed sun-planetary range section allows the range of the 3-speed drive section to be changed and hence results in the first gear acting as the fourth gear, the second gear acting as the fifth gear and the third gear acting as the sixth gear. Thus, if the user has to shift from the third gear to the fourth gear, then the range has to be changed and the first gear has to be actuated. Furthermore, for actuating the fifth gear and the sixth gear in the range changed condition the second and third gear have to be actuated.

Figures 8a-8g are exemplary embodiments of the disclosure illustrating operation of the mechanism (100) to engage gears at different locations in the double-H shift layout. Further, Figures 8a-8g illustrates movement of the shift lever (19) in the double-H layout to operate the mechanism (100), such that the three main forward gears of the 3-speed drive section are actuated twice to actuate six gears.

In an embodiment, the pair of shift fingers (10, 11) are configured to be stationary in the gate defined by the pair of shifter dogs (13, 14) when the shift lever (19) is in the neutral position.

Referring to Figure 8a, upon shifting the shift lever (19) into the reverse gear position, the pair of shift fingers (10, 11) displace laterally towards the second pin (22) in the gate defined by the pair of shifter dogs (13, 14) and the first shift finger (10) gets positioned in line with the second pin (22) (i.e. gets positioned in the fourth plane) to engage the reverse gear. Further, in this position the blocking member (17) of the first shift finger (10) engages with the third pin (23) and the fourth pin (24) and restricts movement of the second shifter dog (14). The first shift finger (10) then pivots towards the second pin (22) and engages with the second pin (22) to displace the second pin (22) in the second direction (SD). The displacement of the second pin (22) in the second direction (SD) displaces the first shifter rail (15) in the second direction (SD) and engages the reverse gear.

Referring to Figure 8b, upon shifting the shift lever (19) into the first gear position in the gear shift layout the pair of shift fingers (10, 11) displace laterally and the first shift finger (10) gets positioned in the first plane, whereas the second shift finger (11) is positioned away from any of the pins in the first shifter dog (13). The first shift finger (10) then pivots towards the first pin (21) and engages with the first protrusion (25) of the first pin (21) and displaces the first protrusion (25) in the first direction (FD). The displacement of the first pin (21) in the first direction (FD) displaces the first shifter rail (15) in the first direction (FD) and engages the first gear.

Referring now to Figure 8c, upon shifting the shift lever (19) from the first gear position into the second gear position the first shift finger (10) in the first plane which is in engagement with the first protrusion (25) pivots towards the fourth pin (24) and engages with the fourth pin (24) to displace the fourth pin (24) in the second direction (SD). The displacement of the fourth pin (24) the in the second direction (SD), displaces the second shifter rail (16) in the second direction (SD) to engage the second gear.

Referring to Figure 8d, upon shifting the shift lever (19) from the second gear position into the third gear position in the gear shift layout, the pair of shift fingers (10, 11) displace laterally and results in the first shift finger (10) getting positioned in the third plane and the second shift finger (11) getting positioned in the second plane. The first shift finger (10) then pivots towards the third pin (23) to engage with the third pin (23) and displace the second shifter rail (16) in the first direction (FD) to engage the third gear. As the first shift finger (10) pivots towards the third pin (23) the second pin (22) is pivoted towards the second pin (22) due to the inversion lever (18) which displaces the second shift finger (11) opposite to the displacement of the first shift finger (10). At this point the second shift finger (11) does not engage with the second pin (22) as the second pin (22) is shorter than the other pins and the second shift finger (11) is also shorter than the first shift finger (10) and results in the second shift finger (11) pivoting over the second pin (22) and does not engage with the second pin (22).

In an embodiment, during shifting between the third gear and the fourth gear a range switch [not show in figures] may be actuated to change the range of the gearbox. This change in the range enables the first gear, second gear and the third gear to act as the fourth gear, the fifth gear and the sixth gear respectively.

Referring now to Figure 8e, upon shifting the shift lever (19) from the third gear position into the fourth gear position in the gear shift layout, the first shift finger (10) which is in engagement with the third pin (23) pivots in the opposite direction. The opposite movement of the first shift finger (10) pivots the second shift finger (11) towards the first pin (21). The second shift finger (11) thereby engages with the top portion of the first pin (21) and displaces the first shifter rail (15) in the first direction (FD) to engage the fourth gear (first gear of the 3-speed drive section). Further, as the first shift finger (10) is in the third plane, the first shift finger (10) does not engage with any of the pins when the shift lever (19) is shifted into the fourth gear position.

Referring to Figure 8f, upon shifting the shift lever (19) from the fourth gear position into the fifth gear position in the gear shift layout, the pair of shift fingers (10, 11) displace laterally and results in the first shift finger (10) moving away from the third plane and the second shift finger (11) getting positioned in the first plane. The first shift finger (10) then pivots in the first direction (FD) and correspondingly pivots the second shift finger (11) in the second direction (SD) to engage with the top portion of the fourth pin (24). As the second shift finger (11) engages with the top portion of the fourth pin (24), the second shifter rail (16) displaces in the second direction (SD) and engages the fifth gear (second gear of the 3-speed drive section).

Lastly referring to Figure 8g, upon shifting the shift lever (19) from the fifth gear position into the sixth gear position in the gear shift layout, the first shift finger (10) pivots in the second direction (SD) and correspondingly pivots the second shift finger (11) in the first direction (FD) to engage with the top portion of the third pin (23). As the second shift finger (11) engages with the top portion of the third pin (23), the second shifter rail (16) displaces in the first direction (FD) and engages the sixth gear (third gear of the 3-speed drive section). Thus, the mechanism (100) shifts between the six gears in the double-H shift layout.
In an embodiment, the fastener (29) used for fastening the inversion lever (18) to the guide plate (20) may be one of bolts, nuts, screws, rivets and the like.

In an embodiment, the mechanism (100) may be provisioned with three, four, or five shift fingers.

In an embodiment, the mechanism (100) may be provisioned with more than four pins extending from the surface of the shifter dogs.

In an embodiment, the mechanism (100) may be provisioned with more than two shifter dogs.

In an embodiment, the mechanism (100) may be provisioned with more than two shifter rails.

In an embodiment, the pins may be formed or fixed to the surface of the shifter dogs.

In an embodiment, the mechanism (100) may be configured inside the gearbox or outside the gearbox of the vehicle.

In an embodiment, the mechanism (100) provides a conventional logical shift diagram without shift blanks.

Equivalents:

The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.

Any discussion of documents, acts, materials, devices, articles and the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.

The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.

While considerable emphasis has been placed herein on the particular features of this disclosure, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other modifications in the nature of the disclosure or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.
Referral Numerals:

Reference Number Description
100 Mechanism
200 Assembly
10 First shift finger
11 Second shift finger
12 Shifter shaft
13 First shifter dog
14 Second shifter dog
15 First shifter rail
16 Second shifter rail
17 Blocking member
18 Inversion lever
19 Shift lever
20 Guide plate
21 First pin
22 Second pin
23 Third pin
24 Fourth pin
25 First protrusion
26 Second protrusion
27 First shifter fork
28 Second shifter fork
29 Fastener
30 Dowel
FD First direction
SD Second direction