Claims:WE CLAIM:
1. A shift assembly (100) for a vehicle transmission system, said assembly (100) comprising:
• a gear stick (102) configured to be manually moved for selecting a gear;
• a shift cable (104) and a selector cable (106) connected to said gear stick (102), said shift cable (104) configured to be shifted when said gear stick (102) is moved;
• a shift lever (108) connected to said shift cable (104), said shift lever (108) configured to be displaced at a distance with which said shift cable (104) is shifted;
• a shift tower (110) connected to said shift lever (108), said shift tower (110) configured to be shifted to a predetermined distance corresponding to the displacement of said shift lever (108);
• a rail-and-fork unit (112) coupled to said shift tower (110), said rail-and-fork unit (112) configured to actuate a synchronizer sleeve and engage said sleeve with the desired gear; and
• a decoupling mass sub-assembly (114) connected to said shift lever (108) and said rail-and-fork unit (112), said decoupling mass sub-assembly (114) configured to maintain equilibrium when said shift lever (108) is linearly displaced, to facilitate smooth shifting of gears.
2. The assembly (100) as claimed in claim 1, wherein said decoupling mass sub-assembly (114) comprises:
• a decoupling connector (114A) attached to said shift lever (108), said connector configured to be linearly displaced when the shift lever (108) is pivoted; and
• a decoupling mass (114B) pivotably attached to the free end of said connector, and further connected to said rail-and-fork unit (112), said decoupling mass (114B) configured to pivot at an angle corresponding to the travel of said decoupling connector (114A) for balancing the torque generated by said shift tower (110) while shifting the gears.
3. The assembly (100) as claimed in claim 2, wherein said decoupling connector (114A) is attached to said shift lever (108) with the help of a ball joint.
4. The assembly (100) as claimed in claim 2, wherein the decoupling mass (114B) comprises a bulk mass enclosed in a housing.
5. The assembly (100) as claimed in claim 2, wherein said decoupling mass sub-assembly (114) further includes a decoupling lever and a ball joint that are configured to couple said decoupling mass (114B) with said decoupling connector (114A) to enable the pivoting of the decoupling mass (114B).
6. The assembly (100) as claimed in claim 1, wherein said rail-and-fork unit (112) is coupled to said shift tower (110) with the help of a shift finger (111), said shift finger (111) is configured to glide over said rail-and-fork unit (112) to transmit the shifting movement of said shift tower (110) to said rail-and-fork unit (112).
, Description:FIELD
The present disclosure relates to the field of vehicle transmission systems.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Shift assembly of a vehicle transmission is employed to allow a driver to choose a desired speed range by shifting gears with the help of a gear stick. Shifting the gears facilitates selecting a gear ratio corresponding to a desired speed range. Typically, the shift assemblies require the driver to exert force while shifting the gears. As a result, the driving experience for the driver becomes quite exhausting.
Further, continuous vibrations are felt by the driver while shifting gears, which leads the driver to subconsciously operate the gear stick gently. However, the gentle displacement of the gear stick will not ensure smooth transition of the gears.
There, is therefore, felt a need for a shift assembly that alleviates the aforementioned drawbacks.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
One object of the present discourse is to provide a shift assembly for a vehicle transmission system.
Another object of the present disclosure is to provide a shift assembly that facilitates smooth gear transitioning.
Yet another object of the present disclosure is to provide a shift assembly that reduces vibrations experienced during gear shifting.
Still another object of the present disclosure is to provide a shift assembly that has a simple and cost-effective configuration.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure relates to a shift assembly for a vehicle transmission system. The assembly comprises a gear stick, a shift cable and a selector cable, a shift lever, a shift tower, a rail-and-fork unit, and a decoupling mass sub-assembly. The gear stick is configured to be manually moved for selecting a gear. The shift cable and a selector cable are connected to the gear stick. The shift cable is configured to be shifted when the gear stick is moved. The shift lever is connected to the shift cable. The shift lever is configured to be displaced at a distance at which the shift cable is shifted. The shift tower is connected to the shift lever. The shift tower is configured to be shifted to a predetermined distance corresponding to the displacement of the shift lever. The rail-and-fork unit is coupled to the shift tower. The rail-and-fork unit is configured to actuate a synchronizer sleeve and engage the sleeve with the desired gear. The decoupling mass sub-assembly is connected to the shift lever and the rail-and-fork unit. The decoupling mass sub-assembly is configured to maintain equilibrium when the shift lever is linearly displaced, to facilitate smooth shifting of gears.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A shift assembly, of the present disclosure, for a vehicle transmission system will now be described with the help of the accompanying drawing, in which:
Figures 1 and 2 illustrates isometric views of the shift assembly; and
Figure 3 illustrates a schematic view of a decoupling mass sub-assembly of the shift assembly of Figure 1.
LIST OF REFERENCE NUMERALS
100 – Shift assembly
102 – Gear stick
104 – Shift cable
106 – Selector cable
108 – Shift lever
109 – Selector lever
110 – Shift tower
111 – Shift finger
112 – Rail-and-fork unit
114 – Decoupling mass sub-assembly
114A – Decoupling connector
114B – Decoupling mass
116 – Decoupling lever
DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details, are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features elements, components, and/or groups thereof.
When an element is referred to as being “mounted on,” “engaged to,” “connected to,” or “coupled to” another element, it may be directly on, engaged, connected or coupled to the other element. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed elements.
Terms such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.
A shift assembly (100) for a vehicle transmission system of the present disclosure is now being described with respect to Figure 1 through Figure 3.
The shift assembly (100) (hereinafter referred to as ‘assembly 100’) comprises a gear stick (102), a pair of transmission cables connected to the gear stick (102), a shift lever (108), a selector lever (109), a shift tower (110), a rail-and-fork unit (112), and a decoupling mass sub-assembly (114). The gear stick (102) is located near the driver seat for granting better access to the driver. The gear stick (102) is configured to be manually moved by the driver for selecting a gear ratio corresponding to the desired speed. The transmission cables include a shift cable (104) and a selector cable (106). The shift cable (104) is configured to be shifted when the gear stick (102) is moved, especially in the direction of movement of the gear stick (102). The shift lever (108) is connected to the shift cable (104). The selector lever (109) is connected to the selector cable (106). The shift lever (108) is configured to be displaced at a distance with which the shift cable (104) is shifted. The shift tower (110) is connected to the shift lever (108) in such a way, that the end of shift lever (108) which is connected to the shift cable (104) is pivoted when the shift cable (104) is moved. The shift tower (110) is configured to be shifted to a predetermined distance corresponding to the displacement of the shift lever (108). The rail-and-fork unit (112) is coupled to the shift tower (110). The rail-and-fork unit (112) is configured to actuate a synchronizer sleeve and engage the sleeve with the desired gear. The decoupling mass sub-assembly (114) is connected to the shift lever (108) and the rail-and-fork unit (112). The decoupling mass sub-assembly (114) is configured to maintain equilibrium when the shift lever (108) is linearly displaced, to facilitate smooth shifting of gears.
The decoupling mass sub-assembly (114) comprises a decoupling connector (114A) and a decoupling mass (114B). In an embodiment, the decoupling connector (114A) is a link. The decoupling connector (114A) is attached to the shift lever (108). The decoupling connector (114A) is configured to be linearly displaced when the shift lever (108) is pivoted. The decoupling mass (104B) is pivotably attached to the free end of the decoupling connector (114A) by means of a ball joint. The other end of the decoupling mass (104B) is further connected to the rail-and-fork unit (112). The decoupling mass is configured to pivot at an angle corresponding to the travel of the decoupling connector (114A). The pivoting of the decoupling mass (114B) facilitates balancing of the torque generated by the shift tower (110) while shifting the gears.
The decoupling mass (114B) essentially comprises a bulk mass which is typically a steel body. The bulk mass is enclosed in a housing. The decoupling mass sub-assembly (114) further includes a decoupling lever (116) and a ball joint which connect the decoupling mass sub-assembly (114) with the connector. The decoupling lever (116) and the ball joint are further configured to enable the pivoting of the decoupling mass (114B) when the decoupling connector is linearly displaced. More specifically, the decoupling mass (114B) is connected to the decoupling lever (116) with the help of a fastener. The decoupling lever is then attached to the ball joint which is connected to the decoupling connector (114A). In an embodiment, the decoupling lever is then connected to the decoupling connector (114A) by means of a fastener which helps in pivoting of the decoupling lever (116).
The decoupling mass sub-assembly (114) helps to reduce the vibrations that are generated due to shifting of the shifting tower, more specifically the torque of the shifting tower. Reduction in vibrations facilitates need of minimum force for the smooth shifting of gears. As a result, less effort is required for gear shifting and the comfort of the driver increases. Further, the gear stick (102) vibrations are also considerably decreased with the help of the decoupling mass sub-assembly (114).
The rail-and-fork unit (112) is coupled to the shift tower (110) with the help of a shift finger (111). The shift finger (111) is configured to glide over the rail-and-fork unit (112) to transmit the shifting movement of the shift tower (110) to the rail-and-fork unit (112).
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a shift assembly for a vehicle transmission system that:
• facilitates smooth gear transitioning;
• reduces vibrations experienced during gear shifting; and
• has a simple and cost-effective configuration.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein.
The foregoing description of the specific embodiments 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.
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 materials, devices, articles or 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.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments 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 changes in the preferred embodiment as well as other embodiments of the disclosure 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.