[001] The present subject matter described herein, relates to gear shift control for automated manual transmission (AMT) vehicle and more particularly, relates to 5th to reverse gear shift inhibit mechanism in AMT vehicle.
BACKGROUND AND PRIOR ART:
[002] Conventional reverse inhibitors, incorporated with gear transmission systems, include a large number of components and/or require extremely accurate machining and assembly to ensure proper operation. During the gear shifting, driver applies load on a Gear shift lever assembly knob, attached to gear shift lever assembly resulting in actuation of shift & select cables, which in turn actuates gear shift system. Shift tower comprises arrangement of various parts, actuation of which enable gear shifting. The conventional reverse inhibitors also contain mechanism for preventing direct shifting of 5th (fifth) to reverse gear, as vehicle is at considerable speed in 5th (fifth) gear, and to engage reverse gear, zero speed is desirable.
[003] Current system has a basic structure of the shift tower, relative arrangement of Yoke, reverse limit and Lever reverse interlock; detent ensures that driver cannot shift to reverse from 5th (fifth) gear directly. To shift the gear in reverse one has to bring knob to neutral position first. The yoke is assembled with the help of pin and loaded with torsional spring. During neutral to 5th gear shifting, the lever moves upward pushing the yoke upwards and then rotating towards 5th gear position. The yoke comes to initial position after 5th gear shift.
[004] During direct shifting from 5th to reverse, the lever moves and hit the yoke on the way thus making it impossible to shift from 5th to reverse gear directly. During shifting from 5th to neutral to reverse, the lever movs first towards right, then downward, and again upward and towards right thus avoiding hitting with the yoke. However, the conventional system has disadvantageous as it is a

complex system, costly as multiple child parts are required, and makes the overall transmission bulky.
[005] In Automated Manual Transmission (AMT) vehicle the actuation of gears is same as MT (Manual transmission) vehicle but the difference is in method of actuation. In MT vehicle, it is mechanical linkages whereas in AMT vehicle, the electro hydraulic actuator assembly is there to do the actuation. Out of the various parts the Shift tower is the interface between actuator assembly and the manual transmission.
[006] Conventionally, in the AMT vehicle, a mechanism is present to prevent direct shifting of 5th to reverse gear as vehicle is at considerable speed in 5th gear and to engage reverse gear, zero speed is desirable. In conventional system relative arrangement of Yoke, reverse limit and Lever reverse interlock; detent ensures that AMT actuator cannot shift to reverse from 5th gear directly. To shift the gear in reverse AMT actutator will first shift to neutral gear position and then shift the reverse gear. The mechanism is same as manual transmission system.
[007] The existing assembly and system for inhibition is complex system that required multiple parts that increases the cost also. Further, the existing system for inhibition is bulky making overall transmission bulky.
[008] Therefore, there is a requirement in the art to provide an inhibition system that is simple and involves low cost. Further, the assembly, shape, operation and location of the parts mentioned in the existing system are not similar to the present disclosure.
OBJECTS OF THE INVENTION:
[009] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
[0010] The principal object of the present invention is to provide an assembly for inhibiting direct gear shifting from 5th to reverse gear in an automated manual transmission (AMT) vehicle.

[0011] Another object of the present subject matter is to provide a simple, cost effective, and efficiently designed assembly on shift tower for AMT vehicle.
[0012] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY OF THE INVENTION:
[0013] This summary is provided to introduce concepts related to an assembly for inhibiting shift of 5th to reverse gear in Automated Manual Transmission (AMT) vehicle. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0014] The present invention relates to an assembly for inhibiting wrong gear shift operation in an AMT vehicle. The assembly is part of shift tower assembly that includes a shift shaft having a lever reverse interlock and a case gear shift guide having a hole to receive the shift shaft. The case gear shift guide defines top surface and bottom surface substantially opposite to the top surface. The lever reverse interlock is provided below the case gear shift guide. Further, a vertical lug extended away from the bottom surface of the case gear shift guide. The vertical lug defining an outer surface and inner surface substantially opposite to the outer surface. The vertical lug includes a first pin and a second pin that project perpendicularly away from the bottom surface towards the shift shaft; a lever reverse is pivotally mounted on the first pin. The lever reverse being configured to rotate about the first pin based on an actuation by the lever reverse interlock. The second pin contacts the lever reverse to restrict rotation of the lever reverse by the lever reverse interlock at a stopping position during shifting of the gear from fifth gear to reverse gear.

[0015] In an aspect, the second pin and the first pin are longitudinally spaced apart from each other.
[0016] In an aspect, the lever reverse defines a first face and a second face substantially opposite to the first face, the first face (104a) is a tapered profile.
[0017] In an aspect, the lever reverse interlock based upon a movement from the fifth to reverse gear, contacts the second face of the lever reverse and the lever reverse stopped by the second pin to inhibit rotation of the lever reverse interlock during shifting from fifth gear to reverse gear.
[0018] In an aspect, the lever reverse interlock pushes the first face to rotate the lever reverse in direction to achieve the fifth gear.
[0019] In an aspect, the lever reverse interlock disengages with the lever reverse just before engagement of the fifth gear.
[0020] In an aspect, self-weight and gravitational forces on the lever enables the lever reverse to retract back to original position after achieving the fifth gear as the lever reverse interlock disengages with the lever reverse.
[0021] In an aspect, the second pin restrict movement of the lever reverse and the lever reverse interlock for shifting of the reverse gear.
[0022] 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 to form a further embodiment of the disclosure.
[0023] 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 THE DRAWINGS
[0024] 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:
[0025] Fig. la illustrates a shift tower assembly for inhibiting wrong gear shift operation in a vehicle, in accordance with an embodiment of the present disclosure;
[0026] Fig. lb illustrates a portion of shift tower assembly having vertical lug and lever reverse, in accordance with an embodiment of the present disclosure;
[0027] Fig. 2a, 2b, and 2c illustrates shifting of fifth gear from neutral in the present assembly of fig. la, in accordance with an embodiment of the present disclosure; and
[0028] Fig. 3a, and 3b illustrates inhibiting shifting gear from fifth to reverse gear in the present assembly of fig. la, in accordance with an embodiment of the present disclosure.
[0029] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0030] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided

herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0031] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0033] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0034] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0035] Fig. 1 illustrates a shift tower assembly for inhibiting shifting of gear from fifth to reverse gear in automated manual transmission (AMT) vehicle. The assembly 100 includes a shift shaft 101 having a lever reverse interlock 105 and a case gear shift guide 102. The case gear shift guide 102 has a hole to receive the shift shaft 101. The case gear shift guide 102 defines top surface 102a and a bottom surface 102b that is substantially opposite to the top surface 102a. From the bottom surface 102b a vertical lug 103 is extended away. The vertical lug 103 defines an outer surface 103c and inner surface 103d that is substantially opposite to the outer surface 103c. The vertical lug 103 include a first pin 103b and a second pin 103a. The first pin 103b and the second pin 103a project perpendicularly away from the bottom surface 103d of the vertical lug 103 towards the shift shaft 101 mounted in the case gear shift guide 102. The first pin 103b is proximal to the second pin 103a. The first pin 103b and the second pin 103a are longitudinally spaced apart from each other in same longitudinal direction. The assembly 100 further includes a lever reverse 104 is pivotally mounted on the first pin 103b and rotate on the first pin 103b. The lever reverse 104 being configured to rotate about the first pin 103b based on an actuation by the lever reverse interlock 105. As shown in subsequent figures, the second pin 103a contacts the lever reverse 104 to restrict movement of the lever reverse 104 by the lever reverse interlock 105 at a stopping position 108 during shifting of the gear from fifth gear to reverse gear.
[0036] Fig. lb illustrates detailed view of the vertical lug 103, the lever reverse 104, and the lever reverse interlock 105 in the assembly 100. As show in the fig. lb, the lever reverse 104 is pivotally mounted on the first pin 103b and restricted by circlip. In the absence of force, the lever reverse 104 remain in downward position due to gravitational force. As the present assembly 100 do not use any spring to retract the original position of the lever reverse 104. Further, the second pin 103a act as a stopper is provided proximal to the first pin 103a. The lever reverse 104 has a first face 104a and a second face 104b substantially opposite to the first face 104a. The first face 104a has a tapered profile to allow sliding of the

lever reverse interlock 105 during shifting of gears from neutral to fifth gear explained in subsequent figures.
[0037] Fig. 2a, 2b, and 2c illustrates position of the lever reverse interlock 105
with the lever reverse 104 in neutral position (original position), in fifth gear
5 engaging position, and fifth gear engaged position. The lever reverse interlock 105
is in contact with the first face 104a of the lever reverse 104. The movement of the shift shaft 101 to shift fifth gear, the lever reverse interlock 105 pushes the lever reverse 104 from the first surface 104 in direction 106. The lever reverse 104 rotates on the first pin 103b as there is no restriction in direction 106. Once the
10 fifth gear is engaged, the first face 104a of the lever reverse 104 disengages from
the lever reverse interlock 105. The lever reverse 104 retract back to original position by moving in direction 107 as the lever reverse 104 has free rotation due to self-weight and gravitational forces. Top view showing movement of the gear shift lever 101 along a path P1, relative the assembly 102, for achieving fifth gear
15 from neutral. In operation, the gear shift lever 101 based upon a movement from
the neutral, contacts the first face 112 of the lever reverse 104 in an initial position IP of the lever reverse 104. Further, the gear shift lever 101 push the first face 112 to rotate the lever reverse 104 from the initial position ‘IP’ to a final position ‘FP’ to achieve the fifth gear. In an embodiment, the first surface 126 of the stopper
20 124 contacts the extension 122 to restrict rotation of the lever reverse 104 at the
final position FP during shifting of the gear shift lever 101 from neutral to the fifth gear.
[0038] Fig. 3a and 3b illustrate direct shifting of gear from from fifth (5th) to
reverse gear. As shown in figure 3a, while the lever reverse interlock 105 moving
25 from fifth to reverse gear, hits the second face 104b of the lever reverse 104. As
shown in the fig. 3b, the lever reverse interlock 105 pushes the second face 104b of the lever reverse 104 till neutral position and further movement of the lever reverse 104 is stopped by the second pin 103a to restrict movement of the lever reverse interlock 105 as indicated by 108 .Thus the present assembly 100 inhibits
9

shifting of gear from the fifth gear to reverse gear in automated manual transmission (AMT) vehicle.
[0039] The assembly 100 provides the following advantages (not limited) in comparison to conventional designs. The advantages include: reduced cost, simple design, compact shift tower due to elimination of child parts, compact TM case due to compact shift tower, etc.
[0040] 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/component 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:

An assembly (100) for inhibiting wrong gear shift operation in a vehicle, the assembly (100) comprising:
a shift shaft (101) having a lever reverse interlock (105);
a case gear shift guide (102) having a hole to receive the shift shaft (101), the case gear shift guide (102) defines top surface (102a) and bottom surface (102b) substantially opposite to the top surface (102a);
a vertical lug (103) extended away from the bottom surface (102b), the vertical lug (103) defines an outer surface (103c) and inner surface (103d) substantially opposite to the outer surface (103c), the vertical lug (103) includes:
a first pin (103b) and a second pin (103a) projected perpendicularly away from the inner surface (103 d) of the vertical lug (103) towards the shift shaft (101);
a lever reverse (104) pivotally mounted on the first pin (103b), the lever reverse (104) being configured to rotate about the first pin (103b) based on an actuation by the lever reverse interlock (105);
the second pin (103a) contacts the lever reverse (104) to restrict movement of the lever reverse (104) by the lever reverse interlock (105) at a stopping position (108) during shifting of the gear from fifth gear to reverse gear.
The assembly (100) as claimed in claim 1, wherein the first pin (103b) and the second pin (103 a) are longitudinally spaced apart from each other.
The assembly (100) as claimed in claim 1, wherein the lever reverse (104) defines a first face (104a) and a second face (104b) substantially opposite to the first face (104a), the first face (104a) is a tapered profile.

The assembly (100) as claimed in claim 3, wherein the lever reverse interlock (105), based upon a movement from the fifth to reverse gear, contacts the second face (104b) of the lever reverse (104) and the lever reverse (104) stopped by the second pin (103a) to restrict movement of the lever reverse interlock (105) during shifting of the gear from the fifth gear to the reverse gear.
The assembly (100) as claimed in claim 1, wherein the lever reverse interlock (105) pushes the first face (104a) to rotate the lever reverse (104) in direction (106) to achieve the fifth gear.
The assembly (100) as claimed in claim 5, wherein the lever reverse interlock (105) disengages with the lever reverse (104) before engaging with the fifth gear.
The assembly (100) as claimed in claim 5, wherein weight and gravitation force of the lever reverse (104) retracts back the lever reverse (104) to original position after achieving the fifth gear as the lever reverse interlock (105) disengages with the lever reverse (104) before engagement of the fifth gear.
The assembly (100) as claimed in claim 1, wherein the second pin (103a) restrict movement of the lever reverse (104) and the lever reverse interlock (105) for shifting of the reverse gear.
The assembly (100) as claimed in claim 1, wherein the assembly (100) is shift tower assembly.
The assembly (100) as claimed in claim 1, wherein the lever reverse interlock (105) is positioned below the bottom surface (102b).
The assembly (100) as claimed in claim 1, wherein the vehicle is automated manual transmission (AMT) vehicle.