Claims:WE CLAIM:
1. A gear shifting and torque transmission mechanism in a transmission system (100), said transmission system (100) comprises:
• at least one shift shuttle (30, 40) mounted on a driven shaft (25);
• at least one driven gear (90) positioned on said shift shuttle (30,40);
• a detent-pin mechanism configured between each of said driven gear (90) and the corresponding shift shuttle (30, 40), said detent-pin mechanism comprising a plurality of detent-pin (70) in co-operation with a coil spring (80) provided on each of said driven gears (90); and
• said shift shuttle (30,40) configured to slide to-and-fro along the axis of said driven shaft (25);
wherein, said shift shuttle (30, 40) rolls over said driven shaft to engage and disengage said driven gear (90) and wherein said detent-pin (70) of the corresponding driven gear (90) gets engage and disengage with a cavity (75) configured on said shift shuttle (30, 40) and thereby said torque transmission takes place from said driven gear (90) to said shift shuttle (30, 40) positioned on said driven shaft (25).
2. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said shift shuttle (30, 40) is configured to roll over said driven shaft (25) by means of a ball bush (45) arrangement and thereby, said shift shuttle (30, 40) makes rolling contact with said driven shaft (25).
3. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said shift shuttle (30, 40) is always in engage position with said driven shaft (25).
4. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein each of said detent-pen (70) with said coil spring (80) is positioned in a hole provided in said driven gear (90) and wherein said torque transmission takes place from said detent pin (70) positioned in said driven gear (90) to said driven shaft (25).
5. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein the access of each of said detent-pin (70) is radial with respect to said driven gear (90).
6. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said transmission system consisting of at least one shift fork (50,60) which is positioned inside a groove (15) provided in said shift shuttle (30, 40).
7. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said shift fork (50, 60) is configured to shift said shift shuttle (30, 40) form an engagement position to disengagement position and from disengagement position to an engagement position of said driven gear (90).
8. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said driven gear (90) mounted on said shift shuttle (30, 40) using a needle bearing (85).
9. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said detent-pen (70) is configured to lock with said cavity (75) provided in said shift shuttle (30, 40) under a compressive force of said coil spring (80).
10. The gear shifting and torque transmission mechanism in the transmission system (100) as claimed in claim 1, wherein said driven shaft (25) is configured with internal splines which is configured to engage with a counter shaft, and thereby transmission takes place from said driven shaft (25) to said counter shaft through said internal splines.
, Description:FIELD
In particular, this disclosure relates to a torque transmission unit in vehicles. More specifically, it relates to a gear shifting mechanism in a transmission system.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Generally, a torque transmission system of a vehicle is used for transmitting power from an engine or an electric motor to a set of vehicle wheels for propelling the vehicle. Therefore, In order to provide a continuously variable torque, a gear shifting mechanism is utilized which is configured to provide a desired torque to the wheels.
A conventional gear shifting mechanism for the torque transmission in the vehicle includes a toothed gear also called as a dog teeth gear, which engage or disengages with a speed gear at the will of an operator. Thus, the transmission of torque between the gears takes place when the dog teeth of a shift hub get engaged with the dog teeth of the gear through a coupling.
However, in the conventional gear shifting mechanism as the torque transfers takes place through the dog teeth by direct surface contact, therefore, it results in a wearing of the dog teeth and decreases the life of the gear.
Further, the usage of several internal gears in the conventional gear shifting mechanism leads to the addition of many components in the gearbox which in turn incurs additional cost, and also increases an overall weight of the vehicle.
Therefore, there exists a need for a gear shifting and torque transmission mechanism in a vehicle, which obviates 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 provide a gear shifting and torque transmission mechanism in a transmission system.
Another object of the present disclosure is to provide a gear shifting and torque transmission mechanism which minimizes the wear and tear of a gear.
Yet another object of the present disclosure is to provide a gear shifting and torque transmission mechanism which provides smooth handling transition of gears.
Still another object of the present disclosure is to provide a gear shifting and torque transmission mechanism which minimizes the cost of operation due to wear and tear,
Yet another object of the present disclosure is to provide a gear shifting and torque transmission mechanism which minimizes the service cost.
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 envisages a gear shifting and torque transmission mechanism in a transmission system. The transmission system comprises at least one shift shuttle mounted on a driven shaft, at least one driven gear mounted on the shift shuttle and a detent-pin mechanism. The detent-pin mechanism includes a plurality of detent-pin in co-operation with a coil spring. The coil spring hold the detent-pin in a position under the action of spring force. The detent-pin is positioned in a hole which is provided in the gear.
Further, the transmission system comprises at least one shift fork, which is positioned inside a groove provided in the shuttle. The shift fork is configured to shift the position of shuttle from engagement position to disengagement position of the gear and vice-versa.
In an embodiment, the shift shuttle is configured to slide to and fro along the axis of the driven shaft. When the shift shuttle moves to engage and disengage position, the shift shuttle rolls over the driven shaft either in left side or right side and thus the detent-pin provided with the driven gear get engages or disengages with a cavity provided on the corresponding shuttle. Thereby, the torque transmission takes place from the driven gear to the shift shuttle positioned on the driven shaft.
Further, the shift shuttle is configured to roll over the driven shaft my means of a ball bush arrangement. The bull bush arrangement enables the shift shuttle to roll over the driven shaft either in left side or right side. The shift shuttle is always in engage position with the driven shaft. Also, the driven gear is mounted on a needle bearing and supported by a ball bearing at the ends.
In an embodiment, the detent-pin is configured to lock with the cavity provided in the driven shaft under a compressive force of the coil spring. Thus, the torque transmission takes place from the detent-pin positioned in the driven gear to the driven shaft. The access of each of the detent-pin is radial with respect to the driven gear.
Advantageously, the shift shuttle makes a rolling contact with the driven shaft while shifting the gear. And thus, it helps in minimizing the wear as well as provides smooth shifting.
In another embodiment, the driven shaft is configured with internal splines. The splines are configured to engage with a counter shaft. And thereby torque transmission takes place from the driven shaft to the counter shaft through the internal splines.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A gear shifting and torque transmission mechanism in a transmission system of the present disclosure will now be described with the help of the accompanying drawing, in which:
Figure 1 shows a perspective view of a torque transmission mechanism in a transmission system from engine input to countershaft output in accordance with an embodiment of the present disclosure;
Figure 2 and 3 shows a perspective view of a of a torque transmission mechanism in a transmission system wherein the position of the shift shuttle indicating neutral condition in accordance with another embodiment of the present disclosure;
Figure 4 shows a perspective view of a of a torque transmission mechanism in a transmission system wherein the position of detent-pin indicates 1st gear engaged condition in accordance with another embodiment of the present disclosure;
Figure 5 shows a perspective view of a of a torque transmission mechanism in a transmission system wherein the position of detent-pin indicates 2nd gear engaged condition in accordance with another embodiment of the present disclosure;
Figure 6 shows a perspective view of a of a torque transmission mechanism in a transmission system wherein the position of detent-pin indicates neutral condition in accordance with another embodiment of the present disclosure;
Figure 7 shows a perspective view of a of a torque transmission mechanism in a transmission system wherein the position of detent-pin indicates 3rd gear engaged condition in accordance with another embodiment of the present disclosure; and
Figure 8 shows a perspective view of a of a torque transmission mechanism in a transmission system wherein the position of detent-pin indicates 4th gear engaged condition in accordance with another embodiment of the present disclosure.
LIST OF REFERENCE NUMERALS USED IN DETAILED DESCRIPTION AND DRAWING
100 Torque transmission system
90 Driven Gear
85 Needle bearing
80 Coil spring
75 Cavity
70 Detent pin
65 Ball bearing
60 Second Shift fork
50 First Shift fork
45 Ball bush
40 Second Shift Shuttle
30 First Shift Shuttle
25 Driven shaft
20 Countershaft output
15 Groove
10 Engine input
A-A’ Speed section
B-B’ Range section

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, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
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.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region or section from another component, region, or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
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 torque transmission system of a vehicle is used for transmitting power from an engine or an electric motor to a set of vehicle wheels for propelling the vehicle. Therefore, In order to provide a continuously variable torque, a gear shifting mechanism is utilized which is configured to provide a desired torque to the wheels.
The conventional gear shifting mechanism for the torque transmission in the vehicle includes toothed gears also called as dog teeth gears, which engage or disengages with a speed gear. Thus, the transmission of torque between the gears takes place when the dog teeth of a shift hub get engaged with the dog teeth of the gear through a coupling.
However, in the conventional gear shifting mechanism as the torque transfers takes place through the dog teeth by direct surface contact, therefore, it results in a wearing of the dog teeth and decreases the life of the gear.
Further, the usage of several internal gears in the conventional gear shifting mechanism leads to the addition of many components in the gearbox which in turn incurs additional cost, cost of operation due to wear and tear, and service cost.
The present disclosure envisages a gear shifting and torque transmission mechanism in a transmission system 100. An embodiment of the present invention will now be described with reference to Figure 1. Figure 1 shows the perspective view of the transmission system 100, comprise at least one shift shuttle 30, 40 mounted on a driven shaft 25; at least one driven gear 90 positioned on the first and second shift shuttle 30, 40 and a detent-pin mechanism. The detent-pin mechanism includes a plurality of detent-pin 70 in co-operation with a coil spring 80. The coil spring 80 hold each of the detent-pin 70 in a position under the action of spring force. The detent-pin 70 is positioned in a hole which is provided in the driven gear 90. The access of each of the detent-pin 70 is radial with respect to the driven gear 90.
Further, the transmission system 100 also comprises at least one shift fork 50, 60, which is positioned inside a groove 15 provided in the first and second shift shuttle 30, 40. The first and second shift fork 50, 60 is configured to shift the corresponding shuttle from engagement position to disengagement position of the gear and vice-versa. The first and second shift fork 50, 60 enables the corresponding shift shuttle to engage with other gear in order to get the desired torque. Under the action of the first and second shift fork 50, 60, the detent-pin 70 shifts from the neutral to the shift position to engage the gear with corresponding shift shuttle, as well as the detent-pin 70 shifts from the shift position to the neutral position to disengage the gear from the corresponding shift shuttle, and the first and second shift fork 50, 60 move to fully disengage the gears as the transmission system 100 is shifted into neutral as indicated by figure 2 and figure 3.
In an embodiment, the first and second shift shuttle 30, 40 is configured to slide to-and-fro along the axis of the driven shaft 25 by means of the first and second shift fork 50, 60. When the gear shifts to engage and disengage, the shift shuttle 30, 40 rolls over the driven shaft 25 either in left side or right side and thus the detent-pin 70 provided on the driven gear 90 gets engage or disengage with a cavity75 provided on the corresponding shift shuttle 30, 40. The first and second shift shuttle 30, 40 is configured to roll over the driven shaft 25 my means of a ball bush 45 arrangement. The bull bush 45 arrangement enables the first and second shift shuttle 30, 40 to roll over the driven shaft 25 either in left side or right side. The first and second shift shuttle 30, 40 is always in engage position with the driven shaft 25. Also, the driven gear 90 is mounted on a needle bearing 85 and supported by a ball bearing 65 at the ends.
Advantageously, the first and second shift shuttle 30, 40 makes a rolling contact with the driven shaft 25 while shifting the gear. Thus, it helps in minimizing the wear as well as provides smooth shifting of the gears. And, thereby, it minimizes the cost of operation and service cost.
In another embodiment, when the first shift fork 50 shifts to left (as indicated by arrow) to engage 1st gear from neutral position, the detent-pin 70 provided on the gear gets engage in the cavity 75 as provided in the first shift shuttle 30 and thereby the required torque will get transferred from the engine input 10 to the driven shaft 25 as indicated by figure 4.
Similarly, when the first shift fork 50 shifts to right (as indicated by arrow) to engage 2nd gear, the detent-pin 70 provided on the gear gets engage in the cavity 75 as provided in the first shift shuttle 30 and thereby the required torque will get transferred from the engine input 10 to the driven shaft 25 as indicated by figure 5.
Further, in order to engage 3rd and 4th gear, it is required to maintain the first shift fork 50 at neutral position as shown in figure 6. Therefore, to engage 3rd gear, the second shift fork 60 required to shift to left (as indicated by arrow), thus the detent-pin 70 provided on the gear gets engage in the cavity 75 as provided in the second shift shuttle 40 and the required torque will get transferred from the engine input 10 to the driven shaft 25 as indicated by figure 7.
Also, in order to obtain 4th gear, the second shift fork 60 required to shift to the right (as indicated by arrow), thus the detent-pin 70 provided on the gear gets engage in the cavity 75 as provided in the second shift shuttle 40 and thus the required torque will get transferred from the engine input 10 to the driven shaft 25 as shown in figure 8.In an embodiment, the driven shaft 25 is configured with internal splines. The splines are configured to engage with a counter shaft. And thereby torque transmission takes place from the driven shaft to the counter shaft through the internal splines.
Further, due to the engagement as well as disengagement of the gear by means of the first and second shift fork 50, 60, a range of speed is obtained in a speed section A-A’ which is being transferred from the driven gear 90 to the countershaft output in a range section B-B’, to obtain the desired output torque.
Therefore, the configuration proposed by the present disclosure eliminates the requirements of the dog teeth gear as used in the conventional gear shifting mechanism and thus sliding contact is replaced by a rolling contact of the shift shuttle which helps in reducing the wear, shift efforts and results in smooth shifting.
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 ADVANCES AND ECONOMICAL SIGNIFICANCE
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a gear shifting and torque transmission mechanism in a transmission system that:
• minimizes the wear and tear of a gear;
• provide smooth handling;
• minimizes the service cost.
The foregoing description of the specific embodiments so fully reveals 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 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.