A reverse gear mechanism for a motorcycle

Abstract

The application provides a reverse gear mechanism of a motorcycle, and belongs to the technical field of motorcycles. The reverse gear mechanism of the motorcycle solves the problem of the existing reverse gear mechanism of the motorcycle, i.e. the structure is not compact and the power performance of the engine is easily affected. The reverse gear mechanism of the motorcycle comprises a supporting sleeve, a shell and a gear shifting main shaft arranged in the shell. A combination gear that rotates synchronously with the gear shifting main shaft is arranged on the gear shifting main shaft. The supporting sleeve comprises a cylindrical main body and a driving gear arranged at one end of the main body. The main body is rotatably arranged on the shell through a bearing. The gear shifting main shaft is rotatably arranged in the supporting sleeve and is supported by the supporting sleeve. An output gear that rotates synchronously with the main body is arranged on the main body. The combination gear can be combined with the driving gear and drive the supporting sleeve to rotate forward. The combination gear can also axially slide to be separated from the driving gear. The application has the advantages of compact structure and high transmission efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motorcycles, and relates to a reverse gear mechanism of a motorcycle. BACKGROUND

[0002] As one of the main means of transportation for people's daily travel, motorcycles are deeply loved by people in cities due to their low driving difficulty and flexibility. The motorcycle reverse gear is used to enable the motorcycle to travel in reverse when needed.

[0003] The reverse gear mechanism of the existing motorcycle, such as a three-wheeled motorcycle engine with reverse gear function (application number: 202120276447.7) disclosed in the patent document, includes an engine box, a power shaft rotatably connected in the engine box, and a reverse gear mechanism provided in the engine box. The reverse gear mechanism includes a forward gear transmission gear and a reverse gear transmission gear rotatably connected with the power shaft, and a reverse gear combination gear provided between the forward gear transmission gear and the reverse gear transmission gear. The reverse gear combination gear can be respectively engaged and disengaged with the forward gear transmission gear and the reverse gear transmission gear, thereby realizing forward or reverse travel of the motorcycle. The reverse gear mechanism has the following disadvantages: 1. When the crankshaft drives the power shaft to rotate, the power of the power shaft needs to be transmitted to the second rotating shaft through the bevel gear set to realize the engine output forward or reverse power. Due to the need to additionally set the gear set, the second rotating shaft and the mounting seat for realizing the installation of the second rotating shaft in the engine box, the engine structure is complex, the structure is not compact, and the manufacturing cost is high. Moreover, the power transmission path is relatively long, and the engine output forward power can be realized only after passing through multiple linked parts, which increases the energy transmission loss in the transmission process, reduces the engine power transmission efficiency, and further affects the power performance of the motorcycle; 2. The motorcycle adopts the design of integrating the forward gear transmission gear, the reverse gear transmission gear and the reverse gear combination gear in the engine. Such a way not only needs to increase the length of the engine power shaft to meet the installation requirements of each gear in the reverse gear mechanism, but also makes the power shaft too long, which requires high machining requirements, otherwise the bending and flatness of the power shaft may be affected, thereby affecting the performance of the engine. Moreover, during the production and manufacturing process, the power shaft is usually connected with the crankshaft of the engine, and then the forward gear transmission gear, the reverse gear transmission gear and the reverse gear combination gear are respectively installed on the power shaft, and then the engine housing is assembled. Such a way has more assembly steps and a longer assembly period, thus resulting in low production efficiency. SUMMARY

[0004] The motorcycle reverse gear mechanism of the present application solves the problem of the existing motorcycle reverse gear mechanism that is not compact in structure and easily causes adverse effects on the power performance of the engine.

[0005] The motorcycle reverse gear mechanism of the present application solves the problem of the existing motorcycle reverse gear mechanism that is not compact in structure and easily causes adverse effects on the power performance of the engine.

[0006] The shift main shaft is used to be connected with the output shaft of the engine, and the output shaft is connected with the crankshaft of the engine, so that the crankshaft of the engine can drive the output shaft and the shift main shaft to rotate synchronously. The shift fork on the motorcycle can drive the combination gear to move axially. When the motorcycle is moving forward, the combination gear is combined with the driving gear, at this time, the shift main shaft drives the support sleeve and the output gear to rotate forward, realizing the forward movement of the motorcycle. When it is needed to move backward, the shift fork drives the combination gear to slide to be combined with the driving gear, at this time, the crankshaft of the engine drives the output shaft and the shift main shaft to rotate forward, and under the action of the reverse gear switching assembly, the support sleeve rotates reversely, and then the output gear rotates reversely, realizing the backward movement of the motorcycle.

[0007] In the reverse gear mechanism, the shift main shaft needs to have high installation stability as the main transmission element of the reverse gear mechanism, otherwise, if the installation stability is not high, the transmission stability will be reduced, affecting the mechanical performance of the motorcycle. In view of this, the support sleeve in the reverse gear mechanism is designed in a unique way, that is, it includes a cylindrical main body and a drive gear at one end of the main body. This design makes the support sleeve play three roles: first, it combines with the combination gear to realize the gear shifting function; second, it provides a mounting for the output gear to drive the output gear to rotate to realize power output; third, the main body of the support sleeve is rotatably arranged on the housing through the bearing, which ensures that the support sleeve has good stability. On this basis, the shift main shaft is rotatably arranged in the support sleeve and supported by the support sleeve. This can well ensure that the shift main shaft has good installation stability, ensuring that the motorcycle has good mechanical stability and power performance. Since the support sleeve realizes the effect of one thing serving multiple purposes, the number of different types of parts needed for the mechanism can be reduced, making the structure of the reverse gear mechanism more compact and saving space. Moreover, since the main body of the support sleeve is sleeved with the output gear to realize power output, this structure not only makes the structure more compact, but also, during the forward driving of the motorcycle, the shift main shaft can directly drive the output gear to rotate through the support sleeve. Therefore, the power transmission is more direct and efficient, which can improve the power transmission efficiency, reduce the energy loss in the gear transmission process, and make the motorcycle have high power performance.

[0008] In the above-mentioned reverse gear mechanism of the motorcycle, the engine of the motorcycle comprises a box body and an output shaft, the output shaft is coaxially arranged with the shift main shaft, the left end of the output shaft is inserted with the right end of the shift main shaft, the inner wall of the main body part is provided with bearing two, the shift main shaft passes through the bearing two, and the support sleeve supports the shift main shaft through the bearing two. In the reverse gear mechanism, the shift main shaft is separately arranged in the shell, the left end of the output shaft is inserted with the right end of the shift main shaft, so that the power of the engine can be transmitted to the shift main shaft of the reverse gear. The structure can be manufactured separately, is convenient to manufacture, has high machining precision and flatness, and can make the engine performance more stable. After the shift main shaft and the output shaft are separately arranged, the connection stability of the two insertion parts needs to be high, otherwise, if the connection stability is not high, the transmission stability of the two will be reduced. Therefore, the support sleeve is arranged to support the shift main shaft through the bearing two, so that the rotation of the shift main shaft is ensured, the stability of the shift main shaft is improved, the connection stability of the shift main shaft and the output shaft is ensured, and the mechanical stability of the motorcycle is ensured. Moreover, the shift main shaft and the output shaft are separately arranged, so that the reverse gear mechanism and the engine can be manufactured and assembled on different production lines in the production process, that is, the reverse gear and the engine are manufactured on different production lines, and then assembled on the assembly production line, so that a highly coordinated and closely coordinated production line is formed, and the production efficiency is improved.

[0009] In the above-mentioned reverse gear mechanism of the motorcycle, the shell is provided with a mounting hole, the bearing one is fixedly arranged in the mounting hole, the other end of the main body part extends out of the mounting hole and is the outer end of the main body part, the output gear is sleeved on the outer end of the main body part, the bushing is sleeved on the main body part and clamped between the inner ring of the output gear and the bearing one, and the oil seal one is arranged between the outer shaft wall of the bushing and the inner wall of the mounting hole. The mounting hole not only provides the mounting position of the bearing one, but also ensures the stability of the bearing one, and then ensures the stability of the support sleeve and the shift main shaft. In addition, one end of the support sleeve extends out of the shell to connect the output gear, so that the output gear is located outside the shell and effectively utilizes the space between the shell and the engine box body. The design is compact in structure and convenient for connecting the transmission elements such as the chain on the output gear to drive the wheel to rotate. The bushing limits the axial position of the output gear, so that the output gear and the shell have enough rotation gap, and the oil seal one is arranged between the bushing and the inner wall of the mounting hole, so that the bearing one is prevented from leaking lubricating oil and external impurities from entering the mounting hole to affect the performance of the bearing one.

[0010] In the reverse gear mechanism of the motorcycle, the right end of the shift main shaft has a radially protruding insertion part, an insertion hole is formed in the end face of the insertion part, the inner wall of the insertion hole has internal splines, the outer wall of the left end of the output shaft has external splines, the left end of the output shaft is inserted into the insertion hole, and the internal splines are engaged with the external splines, and a shaft sleeve is arranged between the insertion part and the inner wall of the main body part. The insertion part protrudes radially, so that the outer diameter of the part is larger, and therefore a larger insertion hole can be obtained, so that the left end of the output shaft has a larger diameter to meet the strength requirement. The shaft sleeve is arranged between the insertion part and the main body part, so that the support sleeve can support the shift main shaft through the bearing and the shaft sleeve, thereby further improving the stability of the shift main shaft and ensuring that the motorcycle has good mechanical stability. The left end of the output shaft is inserted into the insertion hole, and the internal splines are engaged with the external splines, so that the output shaft can drive the shift main shaft to rotate synchronously more stably.

[0011] In the reverse gear mechanism of the motorcycle, the reverse gear mechanism further comprises a connecting bolt, the shift main shaft has an axial hole penetrating through both ends, a connecting hole is formed in the end face of the left end of the output shaft, and the rod of the connecting bolt is screwed through the axial hole and the connecting hole. Through such a design, a single connecting bolt can realize the connection of the shift main shaft and the output shaft, thereby improving the assembly efficiency. Moreover, since the connecting bolt, the shift main shaft and the output shaft are coaxially arranged, the connecting bolt will not cause the output shaft to be eccentric or inclined during tightening, thereby ensuring that the output shaft has high installation precision, so that the engine performance is more stable.

[0012] In the reverse gear mechanism of the motorcycle, the shift main shaft is further sleeved with an oil seal two, the inner wall of the main body part and the outer wall of the shift main shaft are sealed with the oil seal two, and the oil seal two is located between the bearing two and the shaft sleeve. The oil seal two can prevent the lubricating oil from leaking from the bearing two, thereby ensuring that the bearing two has good performance.

[0013] In the reverse gear mechanism of the motorcycle, the reverse gear switching assembly comprises a transmission gear rotatably sleeved on the shift main shaft, the combination gear is located between the transmission gear and the drive gear, the combination gear can be combined with the transmission gear and drive the transmission gear to rotate synchronously after being separated from the drive gear by axial sliding, the inner end of the main body part further has a reverse gear around the outer periphery of the drive gear, the housing is provided with a gear set, the transmission gear drives the reverse gear to rotate through the gear set, and the rotation directions of the reverse gear and the transmission gear are opposite. The outer wall of the combination gear has a shift fork groove matched with the shift fork, and the motorcycle drives the combination gear to move axially left and right through the shift fork. The shift fork is a prior art and will not be described here. The reverse gear is directly formed in the inner end of the main body part, which avoids using an independent reverse gear part, thereby further reducing the number of different types of parts required, and making the structure of the mechanism more compact.

[0014] In the above-mentioned motorcycle reverse gear mechanism, the gear set comprises a first gear and an intermediate shaft rotatably arranged in the housing, the intermediate shaft is provided with a second gear and a third gear, the second gear is engaged with the first gear, and the third gear is engaged with the reverse gear.

[0015] In the above-mentioned motorcycle reverse gear mechanism, the inner wall of the housing is provided with bearing three supporting the left end of the shift main shaft, the connecting bolt is sleeved with a check ring, one side of the check ring abuts against the head of the connecting bolt, and the other side abuts against the inner ring of bearing three. By abutting the check ring against the inner ring of bearing three, the check ring can not only rotate synchronously with the shift main shaft, but also the pressure of the check ring formed by the connecting bolt during the tightening process is borne by bearing three, so that the process of tightening the connecting bolt does not form a force pushing the shift main shaft inward, thereby ensuring that the shift main shaft has high installation precision.

[0016] In the above-mentioned motorcycle reverse gear mechanism, the outer end of the main body is also fixedly sleeved with a limiting sleeve, and the side wall of the output gear away from the bushing abuts against the limiting sleeve. Through such a design, the output gear is clamped between the limiting sleeve and the bushing, thereby ensuring that the output gear has good installation stability.

[0017] Compared with the prior art, the motorcycle reverse gear mechanism has the following advantages:

[0018] 1. The support sleeve realizes the effect of one thing serving multiple purposes, so that the number of different types of parts required by the mechanism can be reduced, thereby making the reverse gear mechanism more compact in structure and saving space.

[0019] 2. Since the output gear is sleeved on the main body of the support sleeve to realize power output, such a structure not only makes the structure more compact, but also during the forward driving of the motorcycle, the shift main shaft can directly drive the output gear to rotate through the support sleeve, so that the power transmission is more direct and efficient, the power transmission efficiency is improved, the energy loss in the gear transmission process is reduced, and the motorcycle has high power performance.

[0020] 3. The output shaft and the shift main shaft can be manufactured separately, which is not only convenient to manufacture, but also can achieve high machining precision and flatness, thereby making the engine performance more stable.

[0021] 4. Since the shift main shaft and the output shaft adopt the split structure, the reverse gear mechanism and the engine can be manufactured synchronously on different production lines and assembled respectively in the production process, i.e. the reverse gear and the engine are manufactured on different production lines respectively, and then assembled together in the assembly production line, so that a highly coordinated and closely matched production line is formed, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the present application.

[0023] Figure 2 is a top view of the present application.

[0024] Figure 3 is Figure 2 is a sectional view of A-A in Fig.

[0025] Figure 4 is an exploded view of the output shaft and the shift main shaft.

[0026] Figure 5 is a schematic view of the reverse gear switching assembly in the first embodiment of the present application.

[0027] Figure 6 is an exploded view of the support sleeve, the coupling gear and the transmission gear.

[0028] Figure 7 is another exploded view of the support sleeve, the coupling gear and the transmission gear.

[0029] Figure 8 is a schematic view of the meshing state of the coupling gear when the motorcycle is driven forward.

[0030] Figure 9 is a schematic view of the meshing state of the coupling gear when the motorcycle is driven backward.

[0031] Figure 10 is a schematic view of the reverse gear switching assembly in the second embodiment of the present application.

[0032] In the figure, 1, housing; 1a, mounting hole; 2, shift main shaft; 2a, insertion part; 2b, insertion hole; 2c, inner spline; 2d, shaft hole; 3, combination gear; 4, support sleeve; 41, main body part; 42, driving gear; 43, reverse gear; 5, bearing one; 6, output gear; 7, box body; 8, output shaft; 81, outer spline; 82, connecting hole; 9, bearing two; 10, bushing; 11, oil seal one; 12, shaft sleeve; 13, oil seal two; 14, transmission gear; 141, inner ring gear; 15, first gear; 16, intermediate shaft; 17, second gear; 18, third gear; 19, bearing three; 20, check ring; 21, limiting sleeve; 22, intermediate gear; 23, transmission shaft; 24, fourth gear; 25, fifth gear; 26, connecting bolt; 27, transmission gear ring. DETAILED DESCRIPTION

[0033] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the accompanying drawings, but the present application is not limited to these embodiments.

[0034] Embodiment one

[0035] As shown in Figure 1 , Figure 2 and Figure 3 , the engine of the motorcycle includes a box body 7 and an output shaft 8, the box body 7 of the engine is prior art, and only a partial structure of the box body 7 is shown in the figure. The reverse gear mechanism of the motorcycle includes a housing 1, a support sleeve 4, and a shift main shaft 2 arranged in the housing 1, the shift main shaft 2 is used to be connected with the output shaft 8 of the engine, and the output shaft 8 is connected with the crankshaft of the engine, so that the crankshaft of the engine can drive the output shaft 8 and the shift main shaft 2 to rotate synchronously. A combination gear 3 is sleeved on the shift main shaft 2 and rotates synchronously with the shift main shaft 2, the support sleeve 4 includes a cylindrical main body part 41 and a driving gear 42 located at one end of the main body part 41, the main body part 41 is rotatably arranged on the housing 1 through a bearing one 5, the shift main shaft 2 is rotatably arranged in the support sleeve 4 and the support sleeve 4 supports the shift main shaft 2, an output gear 6 is sleeved on the main body part 41 and rotates synchronously with the main body part 41, the combination gear 3 can be combined with the driving gear 42 and drive the support sleeve 4 to rotate forward, the combination gear 3 can also axially slide to be separated from the driving gear 42, and the reverse gear mechanism further includes a reverse gear switching assembly which can drive the shift main shaft 2 to drive the support sleeve 4 to rotate reversely after the combination gear 3 is separated from the driving gear 42.

[0036] As shown in Figure 2 and Figure 3As shown, the output shaft 8 and the shift main shaft 2 are coaxially arranged, with the left end of the output shaft 8 and the right end of the shift main shaft 2 interlocked. A bearing 2 9 is installed on the inner wall of the main body 41, through which the shift main shaft 2 passes. The support sleeve 4 supports the shift main shaft 2 via the bearing 2 9. In this reverse gear mechanism, the shift main shaft 2 is separately arranged inside the housing 1. Through the left end of the output shaft 8 and the right end of the shift main shaft 2 interlocked, the power of the engine can be transmitted to the shift main shaft 2 of the reverse gear.

[0037] like Figure 3 As shown, the housing 1 has a mounting hole 1a, and the bearing 5 is fixedly installed in the mounting hole 1a. The other end of the main body 41 extends out of the mounting hole 1a and is the outer end of the main body 41. The output gear 6 is sleeved on the outer end of the main body 41. A bushing 10 is also sleeved on the main body 41, sandwiched between the inner ring of the output gear 6 and the bearing 5. An oil seal 11 is provided between the outer peripheral wall of the bushing 10 and the inner wall of the mounting hole 1a. An oil seal 13 is also sleeved on the shift spindle 2. The inner wall of the main body 41 and the outer wall of the shift spindle 2 are sealed with the oil seal 13. The oil seal 13 is located between the bearing 9 and the bushing 12.

[0038] like Figure 3 As shown, the inner wall of the housing 1 is provided with a bearing 3 19 that supports the left end of the shift spindle 2. A retaining ring 20 is fitted on the connecting bolt 26. One side of the retaining ring 20 abuts against the head of the connecting bolt 26, and the other side abuts against the inner ring of the bearing 3 19. By abutting against the inner ring of the bearing 3 19, the retaining ring 20 can not only rotate synchronously with the shift spindle 2, but also, during the tightening of the connecting bolt 26, the pressure exerted by the connecting bolt 26 on the retaining ring 20 is borne by the bearing 3 19. Therefore, the tightening of the connecting bolt 26 will not generate a force that pushes the shift spindle 2 inward, thus ensuring that the shift spindle 2 has high installation accuracy. A limiting sleeve 21 is also fixedly fitted on the outer end of the main body 41, and the side wall of the output gear 6 facing away from the bushing 10 abuts against the limiting sleeve 21. Through this design, the output gear 6 is clamped between the limiting sleeve 21 and the bushing 10, thus ensuring that the output gear 6 has good installation stability.

[0039] like Figure 3 and Figure 4 As shown, the right end of the shift spindle 2 has a radially protruding insertion part 2a. An insertion hole 2b is provided on the end face of the insertion part 2a. An internal spline 2c is provided on the inner wall of the insertion hole 2b. An external spline 81 is provided on the outer wall of the left end of the output shaft 8. The left end of the output shaft 8 is inserted into the insertion hole 2b and the internal spline 2c meshes with the external spline 81, so that the output shaft 8 can drive the shift spindle 2 to rotate synchronously more stably. A bushing 12 is provided between the insertion part 2a and the inner wall of the main body 41.

[0040] like Figure 3As shown in the drawings, the shift main shaft 2 has a shaft hole 2d passing through both ends, and a connecting hole 82 is formed on the end face of the left end of the output shaft 8, and the rod of the connecting bolt 26 is screwed through the shaft hole 2d and the connecting hole 82.

[0041] As shown in the drawings, Figure 3 , Figure 5 , Figure 6 and Figure 7 , the reverse gear shifting assembly includes a transmission gear 14 rotatably sleeved on the shift main shaft 2, and the combination gear 3 is located between the transmission gear 14 and the driving gear 42. The combination gear 3 can be combined with the transmission gear 14 and drive the transmission gear 14 to rotate synchronously after being separated from the driving gear 42 by axial sliding. The inner end of the main body 41 also has a reverse gear 43 arranged around the outer periphery of the driving gear 42. The housing 1 is provided with a gear set. The transmission gear 14 drives the reverse gear 43 to rotate through the gear set, and the reverse direction of the transmission gear 14 is opposite to that of the reverse gear 43. The outer wall of the combination gear 3 has a shift fork groove matched with the shift fork. The motorcycle drives the combination gear 3 to move axially left and right through the shift fork. The shift fork is a prior art and will not be described here. The gear set includes a first gear 15 and an intermediate shaft 16 rotatably arranged in the housing 1. The first gear 15 is engaged with the transmission gear 14. The intermediate shaft 16 is provided with a second gear 17 and a third gear 18. The second gear 17 is engaged with the first gear 15, and the third gear 18 is engaged with the reverse gear 43.

[0042] As shown in the drawings, Figure 6 , the inner wall of the combination gear 3 has internal teeth, and the transmission gear 14 has an internal gear 141. As shown in the drawings, Figure 8 and Figure 9 , the shift main shaft 2 is sleeved with a transmission gear ring 27 that rotates synchronously with it. The outer wall of the transmission gear ring 27 has external teeth. The combination gear 3 is sleeved on the transmission gear ring 27, and the internal teeth of the combination gear 3 are engaged with the external teeth of the transmission gear ring 27.

[0043] The working principle of the reverse gear is described below:

[0044] Forward driving: As shown in the drawings, Figure 8 , the combination gear 3 slides to the right, so that the internal teeth of the combination gear 3 are engaged with the external teeth of the transmission gear ring 27 and the driving gear 42 at the same time. At this time, the combination gear 3 is combined with the driving gear 42, and the crankshaft of the engine drives the output shaft 8, the shift main shaft 2, the support sleeve 4 and the output gear 6 to rotate forward, realizing the forward driving of the motorcycle.

[0045] Reverse driving: As shown in the drawings, Figure 5 and Figure 9As shown, the shift fork drives the engagement gear 3 to slide to the left, so that the internal teeth of the engagement gear 3 simultaneously mesh with the external teeth of the transmission gear ring 27 and the internal gear ring 141 of the transmission gear 14. At this time, the engagement gear 3 and the transmission gear 14 are engaged. The crankshaft of the engine drives the output shaft 8, the shift main shaft 2, and the transmission gear 14 to rotate in the forward direction. The transmission gear 14 drives the first gear 15 to rotate in the reverse direction. The first gear 15 drives the second gear 17 and the third gear 18 to rotate in the forward direction. The third gear 18 drives the reverse gear 43 to rotate in the reverse direction, thereby realizing the reverse rotation of the support sleeve 4 and the output gear 6, and realizing the motorcycle to move backward.

[0046] Example 2

[0047] This embodiment is basically the same in structure and principle as Embodiment 1, except that, as Figure 10 As shown, the reverse gear switching assembly can be replaced by the following structure: The reverse gear switching assembly includes an intermediate gear 22 located beside the shift spindle 2 and a drive shaft 23. One end of the drive shaft 23 has a fourth gear 24 and the other end has a fifth gear 25. The inner end of the main body 41 also has a reverse gear 43 arranged around the outer periphery of the drive gear 42.

[0048] When the motorcycle moves forward, the engagement gear 3 engages with the drive gear 42 but does not contact the intermediate gear 22, causing the drive gear 42 and the output gear 6 to rotate in the forward direction, thus enabling the motorcycle to move forward.

[0049] When the shift fork drives the engagement gear 3 to move axially and disengage from the drive gear 42, the engagement gear 3 meshes with the intermediate gear 22, causing the intermediate gear 22 to rotate in the opposite direction. This causes the fourth gear 24, which meshes with the intermediate gear 22, to rotate in the forward direction. At this time, the fifth gear 25 also rotates in the forward direction, causing the reverse gear 43, which meshes with the fifth gear 25, to rotate in the reverse direction. At this time, the support sleeve 4 and the output gear 6 rotate in the reverse direction, thus enabling the motorcycle to move backward.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0051] Although the terms 1, housing; 1a, mounting hole; 2, shift main shaft; 2a, insertion part; 2b, insertion hole; 2c, inner spline; 2d, shaft hole; 3, combination gear; 4, support sleeve; 41, main body; 42, driving gear; 43, reverse gear; 5, bearing one; 6, output gear; 7, box; 8, output shaft; 81, outer spline; 82, connecting hole; 9, bearing two; 10, bushing; 11, oil seal one; 12, shaft sleeve; 13, oil seal two; 14, transmission gear; 15, first gear; 16, intermediate shaft; 17, second gear; 18, third gear; 19, bearing three; 20, check ring; 21, limiting sleeve; 22, intermediate gear; 23, transmission shaft; 24, fourth gear; 25, fifth gear; 26, connecting bolt, etc. are used more frequently in the text, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any kind of additional limitation by interpreting them is contrary to the spirit of the present application.

Claims

1. A reverse gear mechanism of a motorcycle, comprising a housing (1) and a shift main shaft (2) arranged in the housing (1), a coupling gear (3) being sleeved on the shift main shaft (2) and rotating synchronously with the shift main shaft (2), an engine of the motorcycle comprising an output shaft (8), characterized in that, The reverse gear mechanism further comprises a support sleeve (4) and a connecting bolt (26), the support sleeve (4) comprises a cylindrical main body (41) and a driving gear (42) at one end of the main body (41), the main body (41) is rotatably arranged on the housing (1) through a bearing (5), the shift main shaft (2) is rotatably arranged in the support sleeve (4) and the support sleeve (4) supports the shift main shaft (2), an output gear (6) is sleeved on the main body (41) and rotates synchronously with the main body (41), the combination gear (3) can be combined with the driving gear (42) and drive the support sleeve (4) to rotate forward, the combination gear (3) can also axially slide to be separated from the driving gear (42), the reverse gear mechanism further comprises a reverse gear switching assembly which can drive the support sleeve (4) to rotate reversely after the combination gear (3) is separated from the driving gear (42); the output shaft (8) is coaxially arranged with the shift main shaft (2), the right end of the shift main shaft (2) has a radially protruding insertion part (2a), an insertion hole (2b) is formed in the end face of the insertion part (2a), the inner wall of the insertion hole (2b) has an internal spline (2c), the outer wall of the left end of the output shaft (8) has an external spline (81), the left end of the output shaft (8) is inserted into the insertion hole (2b) and the internal spline (2c) is engaged with the external spline (81), the shift main shaft (2) has a shaft hole (2d) penetrating through both ends, a connecting hole (82) is formed in the end face of the left end of the output shaft (8), and the rod of the connecting bolt (26) is screwed with the connecting hole (82) through the shaft hole (2d).

2. The reverse mechanism of a motorcycle according to claim 1, characterized in that, The inner wall of the main body (41) is provided with a bearing (9), the shift main shaft (2) passes through the bearing (9), and the support sleeve (4) supports the shift main shaft (2) through the bearing (9).

3. The reverse gear mechanism of a motorcycle according to claim 1 or 2, characterized in that, The housing (1) is provided with a mounting hole (1a), the bearing (5) is fixedly arranged in the mounting hole (1a), the other end of the main body (41) protrudes out of the mounting hole (1a) and is the outer end of the main body (41), the output gear (6) is sleeved on the outer end of the main body (41), and a bushing (10) is sleeved on the main body (41) and clamped between the output gear (6) and the inner ring of the bearing (5), an oil seal (11) is arranged between the outer peripheral wall of the bushing (10) and the inner wall of the mounting hole (1a).

4. The reverse mechanism of a motorcycle according to claim 2, characterized in that, The insertion part (2a) and the inner wall of the main body (41) are provided with a shaft sleeve (12).

5. The reverse mechanism of a motorcycle according to claim 4, characterized in that, The shift main shaft (2) is further sleeved with an oil seal (13), the inner wall of the main body (41) and the outer wall of the shift main shaft (2) are sealed with the oil seal (13), and the oil seal (13) is located between the bearing (9) and the shaft sleeve (12).

6. The reverse mechanism of a motorcycle according to claim 1 or 2, characterized in that, The reverse gear shifting assembly comprises a transmission gear (14) rotatably sleeved on the shifting main shaft (2), the coupling gear (3) is located between the transmission gear (14) and the driving gear (42), the coupling gear (3) can be combined with the transmission gear (14) and drive the transmission gear (14) to rotate synchronously after being separated from the driving gear (42) by axial sliding, the inner end of the main body (41) is further provided with a reverse gear (43) surrounding the outer periphery of the driving gear (42), the housing (1) is provided with a gear set, the transmission gear (14) drives the reverse gear (43) to rotate through the gear set, and the reverse gear (43) rotates in the opposite direction of the transmission gear (14).

7. The reverse mechanism of a motorcycle according to claim 6, characterized in that, The gear set comprises a first gear (15) and an intermediate shaft (16) rotatably arranged in the housing (1), the first gear (15) is engaged with the transmission gear (14), the intermediate shaft (16) is provided with a second gear (17) and a third gear (18), the second gear (17) is engaged with the first gear (15), and the third gear (18) is engaged with the reverse gear (43).

8. The reverse mechanism of a motorcycle according to claim 1 or 2, characterized in that, The inner wall of the housing (1) is provided with a bearing three (19) supporting the left end of the shifting main shaft (2), the connecting bolt (26) is sleeved with a check ring (20), one side of the check ring (20) abuts against the head of the connecting bolt (26), and the other side abuts against the inner ring of the bearing three (19).

9. The reverse mechanism of a motorcycle according to claim 3, characterized in that, The outer end of the main body (41) is further fixedly sleeved with a limiting sleeve (21), and the side wall of the output gear (6) away from the bushing (10) abuts against the limiting sleeve (21). The outer end of the main body (41) is further fixedly sleeved with a limiting sleeve (21), and the side wall of the output gear (6) away from the bushing (10) abuts against the limiting sleeve (21).

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