A reverse gear structure for a motorcycle

Abstract

The application provides a motorcycle reverse gear structure and belongs to the technical field of motorcycles. The motorcycle reverse gear structure solves the low production efficiency problem of the existing motorcycle reverse gear. The motorcycle reverse gear structure is characterized in that the engine of the motorcycle comprises a box body and an output shaft, the reverse gear structure comprises a shell, the shell is internally provided with a shift main shaft coaxial with the output shaft, one end of the shift main shaft is inserted with one end of the output shaft, the shift main shaft and the output shaft are connected through a connecting bolt parallel to the shift main shaft, the box body is provided with a plurality of connecting columns parallel to the shift main shaft, the shell is provided with a plurality of clamping portions corresponding to the connecting columns, the clamping portions are respectively sleeved on the corresponding connecting columns, and the clamping portions are further provided with fasteners capable of tightly clamping or loosening the connecting columns. In the process of connecting the shell and the box body, the position accuracy of the output shaft can be avoided, and the working performance of the engine is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motorcycles, and relates to a motorcycle reverse gear structure. 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 structure of the existing motorcycle is as follows: a three-wheeled motorcycle engine with a reverse gear function (application number: 202120276447.7) disclosed in the patent document includes an engine box, a power shaft is rotatably connected in the engine box, a reverse gear mechanism is arranged 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, a reverse gear combination gear is arranged between the forward gear transmission gear and the reverse gear transmission gear, the reverse gear combination gear can be respectively in clutching cooperation with the forward gear transmission gear and the reverse gear transmission gear, so as to realize forward travel or reverse travel of the motorcycle. The reverse gear has the following disadvantages: the motorcycle adopts a design of integrating the reverse gear mechanism in the engine, the forward gear transmission gear, the reverse gear transmission gear and the reverse gear combination gear in the reverse gear mechanism are all directly arranged on the power shaft in the engine box, such a mode 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 longer, and the excessively long power shaft has higher processing requirements, otherwise it is easy to bend and affect the flatness, thereby affecting the performance of the engine. Moreover, in the production and manufacturing process, the power shaft is usually connected with the crankshaft of the engine, 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 assembly of the engine shell is carried out, such a mode has more assembly steps and a longer assembly period, and therefore leads to low production efficiency. SUMMARY

[0004] The present application aims at the above-mentioned problems existing in the prior art, and provides a motorcycle reverse gear structure, which solves the problem of low production efficiency of the reverse gear of the existing motorcycle on the basis of ensuring stable engine performance.

[0005] The purpose of the present application can be achieved by the following technical solutions: a reverse gear structure of a motorcycle, the engine of the motorcycle comprising a box body and an output shaft, the reverse gear structure comprising a shell, characterized in that the shell is provided with a shift main shaft coaxial with the output shaft, one end of the shift main shaft is inserted into one end of the output shaft, the shift main shaft and the output shaft are connected through a connecting bolt parallel to the shift main shaft, the box body is provided with a plurality of connecting columns parallel to the shift main shaft, the shell is provided with a plurality of clamping portions corresponding to the connecting columns one by one, the clamping portions are respectively sleeved on the corresponding connecting columns, and the clamping portions are further provided with fasteners capable of tightly clamping or loosening the connecting columns.

[0006] In the present reverse gear, the shift main shaft is separately arranged in the shell, one end of the shift main shaft is inserted into one end of the output shaft, and the shift main shaft and the output shaft are connected through the connecting bolt, so that the power of the engine can be transmitted to the shift main shaft of the reverse gear. This design enables the reverse gear and the engine to be manufactured synchronously on different production lines and assembled separately during the production process of the motorcycle, i.e., the reverse gear is integrated first and then assembled with the engine. This can form a highly coordinated and closely matched production line and improve production efficiency.

[0007] During the assembly of the reverse gear and the engine, the connection of the reverse gear shell and the engine box body and the connection of the shift main shaft and the engine output shaft are required. Since the engine output shaft has been installed and debugged in the engine, the installation accuracy of the output shaft should not be affected during the assembly process in order to ensure the working performance of the engine. In view of this, the present motorcycle is provided with a plurality of connecting columns parallel to the shift main shaft on the box body, and a plurality of clamping portions corresponding to the connecting columns one by one are arranged on the shell. During installation, the clamping portions on the shell are first sleeved on the corresponding connecting columns to achieve the preliminary positioning of the shell, and then the connecting bolt is tightened to connect the shift main shaft and the output shaft. During the tightening of the connecting bolt, since the clamping portions are not in the state of tightly clamping the connecting columns, the position of the shell can float along the axis of the connecting column to a certain extent, thereby avoiding the outward pulling of the output shaft during the tightening of the connecting bolt and affecting the installation accuracy of the output shaft. After the shift main shaft and the output shaft are connected, the clamping portions are tightly clamped on the connecting columns by the fasteners to finally achieve the fixed connection of the shell and the box body. Obviously, during the connection of the shell and the box body, the present reverse gear structure can take the output shaft as the reference to fix the shell after the connection of the shift main shaft and the output shaft, thereby avoiding affecting the position accuracy of the output shaft and ensuring the good working performance of the engine. Moreover, the output shaft and the shift main shaft can be separately manufactured, which is not only convenient to manufacture but also can achieve high machining accuracy and flatness, thereby making the engine performance more stable.

[0008] In the above-mentioned motorcycle reverse gear structure, the shift main shaft has a shaft hole penetrating both ends, the left end of the output shaft is inserted into the right end of the shift main shaft, a connecting hole is formed on the end face of the left end of the output shaft, and the rod of the connecting bolt is screwed into the shaft 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.

[0009] In the above-mentioned motorcycle reverse gear structure, the connecting column is cylindrical, the clamping part includes an upper clamping block and a lower clamping block integrally formed on the shell, a clamping hole and a gap communicating with the clamping hole are formed between the upper clamping block and the lower clamping block, the clamping part is sleeved on the connecting column through the clamping hole, and the fastener is a locking bolt penetrating the upper clamping block and perpendicular to the connecting column. The rod of the locking bolt passes through the gap and is screwed with the lower clamping block. By adjusting the pre-tightening force of the locking bolt, the opening width of the gap can be adjusted, and the clamping force formed by the clamping part on the connecting column can be adjusted. In the process of tightening the connecting bolt, the clamping part can form a certain clamping force on the connecting column to pre-position the shell, and at the same time, the position of the shell can be allowed to float in the axial direction of the connecting column, thereby making the assembly process more convenient and the assembly quality good.

[0010] In the above-mentioned motorcycle reverse gear structure, the connecting column includes a root part and a connecting part coaxially arranged, the root part is integrally formed on the outer wall of the shell, and the diameter of the root part is greater than that of the connecting part. The clamping part is sleeved on the connecting part, and the side wall of the clamping part towards the root part has a clearance with the root part. The larger diameter of the root part can improve the strength of the connecting column and make the connection between the connecting part and the shell more stable. The clearance between the side wall of the clamping part towards the root part and the root part allows the position of the shell to float in the axial direction of the connecting column during tightening of the connecting bolt.

[0011] In the above-mentioned motorcycle reverse gear structure, the number of clamping parts is three, two of which are located on the top and bottom of the front side wall of the shell, and the other is located on the rear side wall of the shell. The three clamping parts form a triangular distribution, which can improve the connection stability between the shell and the box.

[0012] In the above-mentioned motorcycle reverse gear structure, an inner wall of the shell is provided with a bearing mounting groove, a bearing one is fixedly mounted in the bearing mounting groove, and the left end of the gear shifting main shaft is supported by the bearing one. A retainer ring is sleeved on the connecting bolt, one side of the retainer ring abuts against the head of the connecting bolt, and the other side abuts against the inner ring of the bearing one. The abutment of the retainer ring and the inner ring of the bearing one allows the retainer ring to rotate synchronously with the gear shifting main shaft, and the pressure of the connecting bolt on the retainer ring is borne by the bearing one during the tightening of the connecting bolt, so that no force is formed to push the gear shifting main shaft inward during the tightening of the connecting bolt, thereby ensuring high installation accuracy of the gear shifting main shaft. The bearing mounting groove ensures good installation stability of the bearing one, and the left end of the gear shifting main shaft is supported by the bearing one, thereby improving the stability of the gear shifting main shaft.

[0013] In the above-mentioned motorcycle reverse gear structure, an end face of the right end of the gear shifting main shaft is provided with a plug-in hole, an inner wall of the plug-in hole is provided with an inner spline, and an outer wall of the left end of the output shaft is provided with an outer spline. The left end of the output shaft is plugged into the plug-in hole, and the inner spline and the outer spline are engaged. With such a design, the output shaft can drive the gear shifting main shaft to rotate synchronously more stably.

[0014] In the above-mentioned motorcycle reverse gear structure, the reverse gear structure further comprises a support sleeve, the support sleeve comprises a cylindrical main body and a drive gear located at one end of the main body, the main body is rotatably connected to the shell through a bearing two, the right end of the gear shifting main shaft is rotatably arranged in the support sleeve, the support sleeve supports the right end of the gear shifting main shaft, and an output gear that rotates synchronously with the main body is sleeved on the main body. After the gear shifting main shaft and the output shaft are divided into two parts, the connection stability of the two parts needs to be high, otherwise the transmission stability of the two parts will be reduced if the connection stability is not high. The reverse gear structure is provided with the support sleeve, which supports the right end of the gear shifting main shaft, thereby improving the stability of the gear shifting main shaft and ensuring good connection stability of the gear shifting main shaft and the output shaft. Moreover, the output gear that rotates synchronously with the main body is sleeved on the main body, the output gear is used to transmit power to realize the driving of the motorcycle, and therefore the support sleeve also functions as a mounting position of the output gear to realize power output. In this way, the gear shifting main shaft can directly drive the output gear to rotate through the support sleeve during the driving of the motorcycle, 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.

[0015] In the above-mentioned motorcycle reverse gear structure, the shift main shaft is sleeved with a combination gear which rotates synchronously with the shift main shaft, the combination gear can be combined with the drive gear and drive the drive gear to rotate forward, and the combination gear can also axially slide to be separated from the drive gear, and the reverse gear switching assembly can drive the drive gear to rotate reversely after the combination gear is separated from the drive gear. The reverse gear switching assembly comprises a transmission gear which is rotatably sleeved on the shift main shaft, the combination gear is located between the transmission gears, and the combination gear can be combined with the transmission gears and drive the transmission gears to rotate synchronously after the combination gear is separated from the drive gear by axial sliding, and the inner end of the main body part is also provided with a reverse gear which is arranged around the outer periphery of the drive gear, and the housing is provided with a gear set, the transmission gears drive the reverse gear to rotate through the gear set, and the reverse gear rotates in the opposite direction of the transmission gears. The gear set comprises a first gear and an intermediate shaft which is rotatably arranged in the housing, the first gear is engaged with the transmission gears, 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.

[0016] In the above-mentioned motorcycle reverse gear structure, the housing is provided with a mounting hole which is opposite to the head of the connecting bolt, and a dust cover is arranged on the mounting hole. After the dust cover is opened, the connecting bolt can be easily tightened, and the assembly is more convenient. After the dust cover is arranged, the dustproof effect is achieved.

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

[0018] 1. In the production process of the motorcycle, the reverse gear and the engine can be synchronously manufactured on different production lines and assembled into the reverse gear and the engine respectively, that is, the reverse gear is integrated first and then assembled with the engine, so that a highly coordinated and closely matched production line is formed, and the production efficiency is improved.

[0019] 2. In the process of connecting the housing and the box body, the shift main shaft is connected with the output shaft, and then the housing is fixed, so that the position accuracy of the output shaft is not affected, and the working performance of the engine is ensured.

[0020] 3. The output shaft and the shift main shaft can be separately manufactured, which is convenient to manufacture and can achieve high machining accuracy and flatness, so that the engine performance is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the present application.

[0022] Figure 2 is a top view of the present application.

[0023] Figure 3 isFigure 2 Sectional view of AA.

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the shell.

[0025] Figure 5 This is a partial three-dimensional structural diagram of the box.

[0026] Figure 6 This is an exploded view of the output shaft and the shift spindle.

[0027] Figure 7 This is a schematic diagram of the reverse gear switching component of the present invention.

[0028] Figure 8 It is an exploded view of the support sleeve, the connecting gear, and the transmission gear.

[0029] Figure 9 This is an exploded view of the support sleeve, connecting gear, and transmission gear from another perspective.

[0030] In the diagram: 1. Housing; 2. Output shaft; 2a. Connecting hole; 2b. External spline; 3. Housing; 31. Bearing mounting groove; 4. Shift spindle; 41. Shaft hole; 42. Insertion hole; 43. Internal spline; 5. Connecting bolt; 6. Connecting column; 61. Root; 62. Connecting part; 7. Clamping part; 71. Upper clamping block; 72. Lower clamping block; 73. Clamping hole; 74. Notch; 8. Clearance; 9. Support sleeve; 91. Main body; 92. Drive gear; 93. Reverse gear; 10. Retaining ring; 11. Bearing 1; 12. Bearing 2; 13. Output gear; 14. Engaging gear; 15. Fastener; 16. Transmission gear; 17. First gear; 18. Intermediate shaft; 19. Second gear; 20. Third gear; 21. Mounting hole; 22. Dust cover. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] like Figure 1 , Figure 2 and Figure 3As shown in the figure, the engine of the motorcycle comprises a box 1 and an output shaft 2, the box 1 is the prior art, only a part is shown in the figure. The output shaft 2 is connected with the crankshaft, so that the power of the engine can be output to the shift main shaft 4. In the structure of the reverse gear of the motorcycle, the reverse gear comprises a shell 3, the reverse gear structure comprises a shift main shaft 4 arranged in the shell 3 and coaxial with the output shaft 2, one end of the shift main shaft 4 is inserted with one end of the output shaft 2, the shift main shaft 4 and the output shaft 2 are connected through a connecting bolt 5 parallel to the shift main shaft 4, the box 1 is provided with a plurality of connecting columns 6 arranged in parallel with the shift main shaft 4, the shell 3 is provided with a plurality of clamping portions 7 corresponding to the connecting columns 6 one by one, the clamping portions 7 are respectively sleeved on the corresponding connecting columns 6, and the clamping portions 7 are further provided with fasteners 15 capable of tightly clamping or loosening the connecting columns 6.

[0033] Further, as shown in the figure, Figure 3 The shift main shaft 4 has a shaft hole 41 with both ends penetrating the pipe, the left end of the output shaft 2 is inserted with the right end of the shift main shaft 4, a connecting hole 2a is formed on the end face of the left end of the output shaft 2, and the rod part of the connecting bolt 5 is screwed through the shaft hole 41 and the connecting hole 2a. Through such design, a single connecting bolt 5 can realize the connection of the shift main shaft 4 and the output shaft 2, thereby improving the assembly efficiency. The shell 3 is provided with a mounting hole 21 opposite to the head part of the connecting bolt 5, and a dust cover 22 is arranged on the mounting hole 21.

[0034] As shown in the figure, Figure 4 and Figure 5 The connecting column 6 is in a cylindrical shape, the clamping portion 7 comprises an upper clamping block 71 and a lower clamping block 72 integrally formed on the shell 3, a clamping hole 73 and a gap 74 communicating with the clamping hole 73 are formed between the upper clamping block 71 and the lower clamping block 72, the clamping portion 7 is sleeved on the connecting column 6 through the clamping hole 73, and the fastener 15 is a locking bolt penetrating the upper clamping block 71 and perpendicular to the connecting column 6, the rod part of the locking bolt penetrates the gap 74 and is screwed with the lower clamping block 72. By adjusting the pre-tightening force of the locking bolt, the opening width of the gap 74 can be adjusted, and then the clamping force of the clamping portion 7 on the connecting column 6 is adjusted. The number of clamping portions 7 is three, of which two clamping portions 7 are respectively located at the top and bottom of the front side wall of the shell 3, and the other clamping portion 7 is located on the rear side wall of the shell 3. Correspondingly, the number of connecting columns 6 is also three.

[0035] As shown in the figure, Figure 4 and Figure 5 The connecting column 6 comprises a root part 61 and a connecting part 62 arranged coaxially, the root part 61 is integrally formed on the outer wall of the shell 3, the diameter of the root part 61 is greater than that of the connecting part 62, and the clamping portion 7 is sleeved on the connecting part 62, as shown in the figure, Figure 2As shown, a clearance gap 8 is left between the side wall of the clamping part 7 facing the root part 61 and the root part 61, so that the position of the housing 3 can float a certain extent along the axial direction of the connecting column 6 during the tightening of the connecting bolt 5.

[0036] like Figure 3 As shown, a bearing mounting groove 31 is provided on the inner wall of the housing 3. A bearing 11 is fixedly installed in the bearing mounting groove 31. The left end of the shift spindle 4 is supported by the bearing 11. A retaining ring 10 is fitted on the connecting bolt 5. One side of the retaining ring 10 abuts against the head of the connecting bolt 5 and the other side abuts against the inner ring of the bearing 11.

[0037] like Figure 6 As shown, a insertion hole 42 is provided on the end face of the right end of the shift spindle 4. The inner wall of the insertion hole 42 has an internal spline 43, and the outer wall of the left end of the output shaft 2 has an external spline 2b. The left end of the output shaft 2 is inserted into the insertion hole 42, and the internal spline 43 and the external spline 2b are engaged. This design allows the output shaft 2 to drive the shift spindle 4 to rotate synchronously more stably.

[0038] like Figure 3 , Figure 8 As shown in Figure 9, the reverse gear structure also includes a support sleeve 9. The support sleeve 9 includes a cylindrical main body 91 and a drive gear 92 located at one end of the main body 91. The main body 91 is rotatably connected to the housing 3 via a bearing 12. The right end of the shift shaft 4 rotatably passes through the support sleeve 9, and the support sleeve 9 provides support for the right end of the shift shaft 4. An output gear 13 that rotates synchronously with the main body 91 is sleeved on the main body 91. A bearing is provided between the main body 91 and the shift shaft 4, so that the main body 91 can rotate relative to the shift shaft 4.

[0039] like Figure 7As shown, the shift main shaft 4 is sleeved with a combination gear 14 which rotates synchronously with the shift main shaft 4, the outer wall of the combination gear 14 is provided with a shift fork groove matched with the shift fork, and the motorcycle is driven by the shift fork to move the combination gear 14 leftward and rightward. The shift fork is a prior art and will not be described here. The combination gear 14 can be combined with the drive gear 92 to drive the drive gear 92 to rotate forward, and the combination gear 14 can also axially slide to be separated from the drive gear 92. The reverse gear structure further comprises a reverse gear switching assembly which can drive the drive gear 92 to rotate reversely after the combination gear 14 is separated from the drive gear 92. The reverse gear switching assembly comprises a transmission gear 16 which is rotatably sleeved on the shift main shaft 4, the combination gear 14 is located between the transmission gear 16 and the drive gear 92, and the combination gear 14 can be combined with the transmission gear 16 to drive the transmission gear 16 to rotate synchronously after the combination gear 14 is separated from the drive gear 92 by axial sliding. The inner end of the main body 91 is further provided with a reverse gear 93 which is arranged around the outer periphery of the drive gear 92. The housing 3 is provided with a gear set, the transmission gear 16 drives the reverse gear 93 to rotate through the gear set, and the reverse gear 93 rotates in the opposite direction of the transmission gear 16. The gear set comprises a first gear 17 and an intermediate shaft 18 which is rotatably arranged in the housing 3. The first gear 17 is engaged with the transmission gear 16, the intermediate shaft 18 is provided with a second gear 19 and a third gear 20, the second gear 19 is engaged with the first gear 17, and the third gear 20 is engaged with the reverse gear 93.

[0040] The working principle of the reverse gear will be described below:

[0041] Forward driving: the combination gear 14 slides rightward to be combined with the drive gear 92, the output shaft 2, the shift main shaft 4, the support sleeve 9 and the output gear 13 are driven by the crankshaft of the engine to rotate forward, thereby realizing the forward driving of the motorcycle.

[0042] Reverse driving: the shift fork drives the combination gear 14 to slide leftward to be combined with the transmission gear 16, the output shaft 2, the shift main shaft 4 and the transmission gear 16 are driven by the crankshaft of the engine to rotate forward, the transmission gear 16 drives the first gear 17 to rotate reversely, the first gear 17 drives the second gear 19 and the third gear 20 to rotate forward, the third gear 20 drives the reverse gear 93 to rotate reversely, thereby realizing the reverse rotation of the support sleeve 9 and the output gear 13, and realizing the reverse driving of the motorcycle.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

[0044] Although the terms 1, box; 2, output shaft; 2a, connecting hole; 2b, external spline; 3, housing; 31, bearing mounting slot; 4, shift spindle; 41, shaft hole; 42, insertion hole; 43, internal spline; 5, connecting bolt; 6, connecting column; 61, root; 62, connecting part; 7, clamping part; 71, upper clamping block; 72, lower clamping block; 73, clamping hole; 74, notch; 8, clearance gap; 9, support sleeve; 91, main body; 92, drive gear; 93, reverse gear; 10, check ring; 11, bearing one; 12, bearing two; 13, output gear; 14, combination gear; 15, fastener; 16, transmission gear; 17, first gear; 18, intermediate shaft; 19, second gear; 20, third gear; 21, mounting hole; 22, dust cover and the like are used more frequently in the text, the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any additional limitation is contrary to the spirit of the present application.

Claims

1. A reverse gear structure of a motorcycle, the engine of the motorcycle comprising a casing (1) and an output shaft (2), said reverse gear structure comprising a housing (3), characterized in that, The shell (3) is provided with a shift main shaft (4) coaxial with the output shaft (2), one end of the shift main shaft (4) is inserted with one end of the output shaft (2), the shift main shaft (4) and the output shaft (2) are connected through a connecting bolt (5) parallel to the shift main shaft (4), the box (1) is provided with a plurality of connecting columns (6) parallel to the shift main shaft (4), the shell (3) is provided with a plurality of clamping parts (7) corresponding to each connecting column (6), the clamping part (7) is respectively sleeved on the corresponding connecting column (6), the clamping part (7) is further provided with a fastener (15) capable of clamping or loosening the connecting column (6).

2. The structure of the reverse gear of a motorcycle according to claim 1, characterized in that, The shift main shaft (4) has an axis hole (41) with both ends penetrating the pipe, the left end of the output shaft (2) is inserted with the right end of the shift main shaft (4), the left end face of the output shaft (2) is provided with a connecting hole (2a), the rod part of the connecting bolt (5) penetrates the axis hole (41) and is screwed with the connecting hole (2a).

3. The motorcycle reverse gear structure according to claim 1, characterized in that, The connecting column (6) is cylindrical, the clamping part (7) includes an upper clamping block (71) and a lower clamping block (72) integrally formed on the shell (3), the upper clamping block (71) and the lower clamping block (72) form a clamping hole (73) and a notch (74) communicating with the clamping hole (73), the clamping part (7) is sleeved on the connecting column (6) through the clamping hole (73), the fastener (15) is a locking bolt penetrating the upper clamping block (71) and perpendicular to the connecting column (6), the rod part of the locking bolt penetrates the notch (74) and is screwed with the lower clamping block (72).

4. The structure of the reverse gear of a motorcycle according to claim 3, characterized in that, The connecting column (6) includes a root (61) and a connecting part (62) coaxially arranged, the root (61) is integrally formed on the outer wall of the shell (3), the diameter of the root (61) is greater than the diameter of the connecting part (62), the clamping part (7) is sleeved on the connecting part (62), and the side wall of the clamping part (7) towards the root (61) and the root (61) leave a clearance (8).

5. The motorcycle reverse gear structure according to claim 2, characterized in that, The inner wall of the shell (3) is provided with a bearing mounting groove (31), the bearing mounting groove (31) is fixedly provided with a bearing one (11), the left end of the shift main shaft (4) is supported by the bearing one (11), the connecting bolt (5) is sleeved with a check ring (10), one side of the check ring (10) abuts against the head of the connecting bolt (5) and the other side abuts against the inner ring of the bearing one (11).

6. The motorcycle reverse gear structure according to claim 2, characterized in that, The reverse gear structure further comprises a support sleeve (9), the support sleeve (9) comprises a main body part (91) in the form of a cylinder and a drive gear (92) located at one end of the main body part (91), the main body part (91) is rotatably connected to the shell (3) through a bearing two (12), the right end of the shift main shaft (4) is rotatably arranged in the support sleeve (9) and the support sleeve (9) supports the right end of the shift main shaft (4), the main body part (91) is sleeved with an output gear (13) which rotates synchronously with the main body part (91).

7. The structure of the reverse gear of a motorcycle according to claim 6, characterized in that, The shift main shaft (4) is sleeved with a combination gear (14) rotating synchronously with the shift main shaft (4), the combination gear (14) can be combined with the driving gear (92) and drive the driving gear (92) to rotate forward, the combination gear (14) can also axially slide to be separated from the driving gear (92), the reverse gear structure further comprises a reverse gear switching assembly capable of driving the driving gear (92) to rotate reversely after the combination gear (14) is separated from the driving gear (92).

8. The motorcycle reverse gear structure according to claim 2, characterized in that, The end face of the right end of the shift main shaft (4) is provided with an insertion hole (42), the inner wall of the insertion hole (42) is provided with an inner spline (43), the outer wall of the left end of the output shaft (2) is provided with an outer spline (2b), the left end of the output shaft (2) is inserted into the insertion hole (42), and the inner spline (43) is engaged with the outer spline (2b).

9. The structure of the reverse gear of a motorcycle according to claim 1 or 2 or 3, characterized in that, The number of the clamping portions (7) is three, two clamping portions (7) are respectively arranged on the top and bottom of the front side wall of the shell (3), and the other clamping portion (7) is arranged on the rear side wall of the shell (3).

10. The structure of the reverse gear of a motorcycle according to claim 1 or 2 or 3, characterized in that, The shell (3) is provided with a mounting hole (21) opposite to the head of the connecting bolt (5), and the mounting hole (21) is provided with a dust cover (22).

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