DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
A SHIFTER PAD

Applicant:
Tata Motors Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai - 400001,
Maharashtra, India

The following specification particularly describes the invention and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application claims priority from Indian Patent application no. (201921012278) filed on 28th March, 2019.
FIELD OF THE INVENTION
[002] The present disclosure in general relates to a shifter pad for changing gears in a vehicle and more specifically it relates to a shifter pad comprising a cover.
BACKGROUND
[003] Generally, a shifter pad is a vital part of an internal gearshift mechanism of a gearbox used to transfer motion and force from a shifter fork to a shifter sleeve during a gear change. It is to be noted that, the shifter pad is connected to the shifter fork and a rotating sleeve. In a conventional shifter pad, due to the differential speed between the shifter pad (zero speed) and a shifter sleeve (based on gear selected) there is continuous rubbing of contacting surface of these two parts. This leads to heat generation due to frictional properties of these two parts that gets dissipated into transmission, causing greater impact of load on the shifter pad, and thus reducing the life of the shifter pad.
OBJECTS OF THE INVENTION
[004] An object of the present subject matter is to increase the durability of the shifter pad compared to mono material pads.
[005] Another object of the present subject matter is to provide improved gearshift feel.
[006] Another object of the present subject matter is to enable the shifter pad resistant to shock loads through base material.
[007] A yet another object of the present subject matter is to provide a replaceable cover.
SUMMARY
[008] It is to be understood, that this application is not limited to the particular systems, and methodologies described, as there can be multiple possible embodiments, which are not expressly illustrated, in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce concepts related to a shifter pad. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[009] The present subject matter discloses a shifter pad for a gearshift mechanism of a vehicle. In one embodiment, the shifter pad may comprise a base shifter pad and a cover. The base shifter pad may comprise a slit such that a part of the cover may be configured to be engaged with the slit of the base shifter pad. Further, the slit may be located at a centre of the base shifter pad. In one another embodiment, the cover may be configured to be an H-shaped structure. The H-shaped structure comprises two vertical walls connected by a horizontal wall. In yet another embodiment, during assembly, the horizontal wall is configured to be inserted into the slit of the base shifter pad in order to sustain shock loads during changing of gears in a vehicle.
BRIEF DESCRIPTION OF DRAWINGS
[0010] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and device disclosed in the document and the drawing. The detailed description is described with reference to the following accompanying figures.
[0011] Figure 1 illustrates a cross sectional view of a base shifter pad, in accordance with an embodiment of the present subject matter.
[0012] Figure 2 illustrates a cross sectional view of a cover, in accordance with an embodiment of the present subject matter
[0013] Figure 3 illustrates an isometric view of an assembly, in accordance with an embodiment of the present subject matter.
[0014] Figure 4 illustrates an isometric view of a shifter pad assembly, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION
[0015] Some embodiments of the present disclosure, illustrating all its features, will now be discussed in detail. The words “comprising”, “including”, and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, a shifter pad is now described. The disclosed embodiment of the shifter pad is merely exemplary of the disclosure, which may be embodied in various forms.
[0016] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure the shifter pad is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[0017] As described above, there are limitations in a conventional shifter pad. Conventionally, the shifter pad is a single pad connected to a shifter fork and a rotating sleeve, due to the differential speed between the shifter pad (zero speed) and a shifter sleeve (based on gear selected) there is continuous rubbing of contacting surface of these two parts. This leads to heat generation due to frictional properties of these two parts that gets dissipated into transmission oil. Hence, due to the heat generation or a load impacted on the shifter pad due to friction, it leads to reduced life of the shifter pad and bad gearshift feel while changing the gears. However, conventionally, a sliding block is provided that covers the shifter pad from both the ends, but this leads to an unequal distribution of load on the assembly of the shifter pad and the sliding block. Therefore, this leads to increased shock loads. Thus, there is need to overcome the limitation.
[0018] In one implementation, a shifter pad is illustrated. In one embodiment, the shifter pad may comprise a base shifter pad and a cover. The base shifter pad may comprise a slit such that a part of the cover may be configured to be engaged with the slit of the base shifter pad. Further, the slit may be located at a centre of the base shifter pad. In one another embodiment, the cover may be configured to be an H-shaped structure. The H-shaped structure comprises two vertical walls connected by a horizontal wall. In yet another embodiment, during assembly, the horizontal wall is configured to be inserted into the slit of the base shifter pad in order to sustain shock loads during changing of gears in a vehicle.
[0019] In one embodiment there may include an advantage, that is, base material can sustain shock loads during gear engagement, as the cover is inserted into the slit of the base shifter pad, the cover does not enclose the base shifter pad completely. Further, the cover encloses side walls of the base shifter pad, whereas the ends of the base shifter pad remains uncovered.
[0020] Now referring to Figure 1, an assembly of a shifter pad 100, a fork 12, a shifter sleeve 14 and a shifter shaft 16 is disclosed. The fork 12 is engaged with the shifter shaft 16 and the shifter pad 100 is engaged with the fork 12. The shifter sleeve 14 is configured to be engaged with the shifter pad 100. To change the gears in the gear shift mechanism, the motion is transferred from the shifter shaft 16 to the fork 12, from the fork 12 to the shifter pad 100 and finally from the shifter pad 100 to the shifter sleeve 14 to engage with a different gear.
[0021] The shifter pad 100 may comprise a base shifter pad 102 and a cover 202. Now, referring to Figures 2-4, Figure 2 illustrates a cross sectional view 110 of the base shifter pad 102. Figure 3 illustrates a cross sectional view 210 of the cover 202. Figure 4 illustrates an isometric view 310 of the assembly of the shifter pad 100. Further, the present subject matter is explained with reference to Figure 1 to 4, in order to maintain the readability of the present subject matter.
[0022] In one aspect, the base shifter pad 102 may comprise a slit 104. Further, the slit 104 may be located at a centre of the base shifter pad 102. In another aspect, the cover 202 may be an H-shaped structured (as shown in figure 3). Further, the H-shaped structure may have two vertical walls 204 connected by a horizontal wall 206 (as shown in figure 3).
[0023] In another embodiment, during assembly of the base shifter pad 102, the horizontal wall 206 of the cover 202 may be inserted into the slit 104 of the base shifter pad 102 (as shown in figure 4). In one implementation, the cover 202 may be replaceable. In one aspect, the base shifter pad 102 may be made of any alloy material preferably FE410. In another aspect, the cover 202 may be made of plastic. In yet another aspect, the base shifter pad 102 made of FE410 or any other equivalent material and the cover 202 made of plastic or any other equivalent material together form a bi-material shifter pad. In yet another embodiment, the base shifter pad 102 may comprise a cylinder 106 (as shown in figure 2). The cylinder 106 may be located at an outer surface of the base shifter pad 102 and opposite to the slit 104. In one aspect, a bush 302 may be mounted to the cylinder 106. In another aspect, the bush 302 may be made of a self-lubricating plastic material. Further, the bush 302 may be coupled to the fork 12 of the gear shift mechanism, to have improved gear shift feel for the vehicle.
[0024] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following.
[0025] Some embodiments of the present subject matter enable to increase the durability of the shifter pad.
[0026] Some embodiments of the present subject matter provide improved gearshift feel.
[0027] Some embodiments of the present subject matter enable the shifter pad resistant to shock loads.
[0028] Some embodiments of the present subject matter provide a replaceable cover.

[0029] Although implementations for the shifter pad 100 have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed as examples of implementations for the shifter pad 100.
,CLAIMS:
1. A shifter pad (100) for a gearshift mechanism in a vehicle, wherein the shifter pad (100) comprises:
a base shifter pad (102), wherein the base shifter pad (102) comprises a slit (104); and
a cover (202), wherein a part of the cover (202) is configured to be engaged with the slit (104).

2. The shifter pad (100) as claimed in claim 1, wherein the slit (104) is located at a centre of the base shifter pad (102).

3. The shifter pad (100) as claimed in claim 1, wherein the cover (202) is configured to cover at least two sides of the base shifter pad (102).

4. The shifter pad (100) as claimed in claim 1, wherein the cover (202) is configured to be an H-shaped structure, wherein the H-shaped structure comprises two vertical walls (204) connected by a horizontal wall (206), and wherein during assembly, the horizontal wall (206) is inserted into the slit (104) of the base shifter pad (102) in order to sustain shock loads during changing of gears in the vehicle.

5. The shifter pad (100) as claimed in claim 1, wherein the base shifter pad (102) is made of FE410 or any other equivalent material.

6. The shifter pad (100) as claimed in claim 1, wherein the cover (202) is made of plastic or any other equivalent material.

7. The shifter pad (100) as claimed in claim 1, wherein the cover (202) is replaceable.

8. The shifter pad (100) as claimed in claim 1, wherein the base shifter pad (102) comprises a cylinder (106), wherein the cylinder (106) is located at an outer surface of the base shifter pad (102) and opposite to the slit (104).

9. The shifter pad (100) as claimed in claim 8, wherein the cylinder (106) of the base shifter pad (102) is configured to be engaged with a bush (302) coupled to a fork (12) of the gear shift mechanism.
10. The shifter pad (100) as claimed in claim 9, wherein the bush (302) is made of a material comprising properties of wear resistance, less friction and self-lubricating.