Reverse gear of sidecar motorcycle

Abstract

The transmission gear of the invention is a gear shifting device for a three-wheeled motorcycle, comprising a housing, a main shaft supported in a cavity of the housing, a shifting gear circumferentially fixed on the main shaft, a reverse bevel gear is arranged on one side of the shifting gear, and an output bevel gear is arranged on the other side. The bridge bevel gear is respectively meshed with the reverse bevel gear and the output bevel gear, and the reverse bevel gear is slidably fitted on the main shaft, and the output bevel gear is supported by the housing, and the output bevel gear is provided with an axially extending hollow shaft section, one end of the hollow shaft section protrudes outward from the housing and circumferentially fixes an output sprocket. One end of the main shaft is supported in the axial hole of the hollow shaft section and is connected to the output shaft of the engine. A shifting shaft is installed on the housing, and a sliding fork is installed on the shifting shaft, and the fork head of the sliding fork is clamped in the annular groove of the shifting gear, and the fork tail of the sliding fork is sleeved on the shifting shaft, and a cam groove is arranged on the fork tail of the sliding fork, and a toggle pin driven by the shifting shaft is inserted into the cam groove for driving the sliding fork to move axially along the shifting shaft, and one end of the shifting shaft protrudes outward from the housing and is circumferentially fixedly connected to a shifting pedal.

Description

Technical Field

[0001] The invention relates to the field of sidecar three-wheeled motorcycles, in particular to a reverse gear of a sidecar three-wheeled motorcycle. Background Art

[0002] Existing sidecar three-wheeled motorcycles usually do not have reverse gears. In a spacious area, the driver can only reach the desired reverse position by turning the forward gear. The position reached in this way is difficult to control and also wastes energy. However, when driving on a narrow road, the driver can only get off the motorcycle and push it manually. Not only is the direction of the sidecar three-wheeled motorcycle difficult to control, but it is also very laborious, which brings great trouble to the user. The reverse gear of the existing three-wheeled motorcycle is shaft output. The output shaft of the reverse gear drives the rear wheel of the three-wheeled motorcycle to rotate through the transmission shaft. The shaft output has high requirements on the environment. The driving environment of the motorcycle is changeable, and the transmission shaft is easily affected by the environment, which shortens its service life. In addition, the overload capacity of this output mode is weak and the transmission efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to provide a reverse gear for a sidecar motorcycle in view of the deficiencies in the prior art, which can realize the reverse gear of the sidecar motorcycle, bringing great convenience to the driving of the sidecar motorcycle, and it is driven by a chain, thereby increasing the overload capacity and adaptability.

[0004] The technical solution of the present invention is: a reverse gear of a sidecar motorcycle, comprising a housing, a main shaft supported by a bearing in the cavity of the housing, a shift gear circumferentially fixed to the main shaft and movable in the axial direction, a reverse bevel gear is arranged on one side of the shift gear, and an output bevel gear is arranged on the other side, the reverse bevel gear and the output bevel gear are respectively provided with coupling teeth engaged with the shift gear, a bridge bevel gear is located between the reverse bevel gear and the output bevel gear and is respectively meshed with the reverse bevel gear and the output bevel gear, the reverse bevel gear is slidably fitted on the main shaft, the output bevel gear is supported by the housing through a bearing, and the output bevel gear is provided with an axially extending hollow shaft The gear shifting mechanism is a kind of gear shifting mechanism, and its first end is connected with the gear shifting mechanism through the support frame, and its second end is connected with the gear shifting mechanism through the support frame.

[0005] A shift sleeve is fixed on the shift shaft in the circumferential direction of the shaft positioning, and the shift sleeve is slidably matched with the fork tail of the sliding fork. A shift pin is fixedly installed on the shift sleeve, and the shift pin is inserted into the cam groove of the fork tail of the sliding fork.

[0006] The shift sleeve is axially limited by a limiting sleeve sleeved on the shift shaft.

[0007] A gear locking sleeve is fixed circumferentially on the shift shaft, and a gear slot is arranged on the circumference of the gear locking sleeve. A spring ejector pin is installed on the box body, and a wedge-shaped pin head of the spring ejector pin corresponds to the gear slot.

[0008] The tail end of the spring ejector pin is provided with an axial blind hole, a compression spring is inserted into the axial blind hole, and a bolt is used to press against the compression spring to form a limit, and a distance is left between the spring ejector pin and the bolt.

[0009] An anti-misoperation mechanism is arranged on the outer wall of the box body, and the anti-misoperation mechanism includes a mounting seat and a limit pin. The mounting seat is provided with two brackets, and the limit pin is slidably supported on the two brackets. The limit pin is located on the shaft section between the two brackets and is sleeved with a return spring. One end of the return spring is against one bracket, and the other end is limited by a retaining spring. One end of the limit pin extends to the bottom of the shift pedal to limit the misoperation of the shift pedal, and the other end of the limit pin is used to fix the control cable operated by the handle.

[0010] A box cover is arranged on one side of the box body, the hollow shaft section of the output bevel gear protrudes outward from a bearing hole arranged on the box cover, and an axially extending mounting column is arranged on the box cover.

[0011] The major axis extending direction of the cam groove is oblique to the axial direction of the sliding fork tail.

[0012] One end of the output sprocket is limited by a bushing sleeved on the hollow shaft section of the output bevel gear, and the other end is limited by a nut threadedly matched on the external thread section of the hollow shaft section.

[0013] One end of the main shaft located in the shaft hole of the hollow shaft section of the output bevel gear is spline-connected to an internal spline sleeve, and the internal spline sleeve is used for spline connection with the output shaft of the engine.

[0014] The above technical solution is adopted: it includes a box body, a main shaft is supported by a bearing in the cavity of the box body, a shift gear that can move axially is fixed on the main shaft in the circumferential direction, a reverse gear bevel gear is arranged on one side of the shift gear, and an output bevel gear is arranged on the other side, the reverse gear bevel gear and the output bevel gear are respectively provided with a combination tooth engaged with the shift gear, a bridge bevel gear is located between the reverse gear bevel gear and the output bevel gear and meshes with the reverse gear bevel gear and the output bevel gear respectively, the reverse gear bevel gear is slidably fitted on the main shaft, the output bevel gear is supported on the box body by a bearing, the output bevel gear is provided with an axially extending hollow shaft section, the hollow shaft section One end extends out of the housing, and an output sprocket is fixed circumferentially on the extended end. One end of the main shaft is supported in the shaft hole of the hollow shaft section through a bearing, and is used to connect the engine output shaft. The housing is equipped with a shift shaft parallel to the main shaft, and a sliding fork is installed on the shift shaft. The fork head of the sliding fork is stuck in the annular groove of the shift gear, and the fork tail of the sliding fork is sleeved on the shift shaft. A cam groove is provided on the fork tail of the sliding fork, and a shift pin driven by the shift shaft is inserted into the cam groove to drive the sliding fork to move axially along the shift shaft. One end of the shift shaft extends out of the housing and is circumferentially fixedly connected to a shift pedal. During operation, the engine output shaft of the sidecar motorcycle drives the main shaft to rotate, and the main shaft will drive the shift gear to rotate together. The shift gear is driven by the sliding fork to move axially on the main shaft and mesh with the output bevel gear or the reverse bevel gear. When the combination teeth of the shift gear mesh with the combination teeth of the output bevel gear, the reverse gear is in the forward gear, the shift gear will directly drive the output bevel gear to rotate, and the output bevel gear will drive the output sprocket to rotate and drive the rear wheel of the sidecar three-wheeled motorcycle to rotate through the chain, so as to realize the forward movement of the motorcycle. When the combination teeth of the shift gear mesh with the reverse gear bevel gear, the shift gear will drive the reverse gear bevel gear to rotate, and the power will drive the output bevel gear to rotate in the opposite direction after being transmitted through the bridge bevel gear, thereby driving the rear wheel of the motorcycle to rotate in the opposite direction through the sprocket to realize the reverse gear of the motorcycle. The reverse gear has forward gear and reverse gear, and the power transmission of the forward gear and reverse gear is stable and reliable, thereby realizing the forward and backward movement of the sidecar three-wheeled motorcycle. It can bring convenience to the backward movement of the sidecar three-wheeled motorcycle, and the driving of the sidecar three-wheeled motorcycle is also simpler and more labor-saving, and the backward position control is also convenient, and the backward direction control is also easy, which provides great convenience for the driver. At the same time, the reverse gear outputs power through the output sprocket, realizing the chain drive drive of the sidecar three-wheeled motorcycle, and the chain drive has high transmission efficiency, good environmental adaptability and long service life. In addition, the overload capacity of the chain drive is also good, which improves the safety performance of motorcycle driving. When shifting gears, the shifting pedal is stepped on to drive the shifting shaft to rotate, and the shifting shaft drives the toggle pin to rotate together.Because the shift pin is inserted in the cam groove of the sliding fork, and the fork head of the sliding fork is located in the annular groove of the shift gear, the circumferential rotation of the sliding fork is limited. Therefore, the rotating shift pin will slide in the cam groove and force the sliding fork to slide axially along the shift shaft, thereby realizing the driving of the shift gear by the sliding fork and the meshing of the shift gear with the output bevel gear or the reverse bevel gear, and the shifting is stable and reliable.

[0015] A shift sleeve is fixed circumferentially on the shift shaft, and the shift sleeve is slidably matched with the fork tail of the sliding fork. A shift pin is fixedly installed on the shift sleeve, and the shift pin is inserted into the cam groove of the fork tail of the sliding fork. The fork tail of the sliding fork is in the shape of a shaft sleeve, and the shift sleeve is located between the shaft sleeve fork tail of the sliding fork and the shift shaft, which not only ensures the axial sliding of the sliding fork, but also increases the mechanical strength of the shift shaft. The shift sleeve is axially limited by the limit sleeve on the shift shaft, and the limit sleeve is pressed between the shift sleeve and the box body to prevent the axial movement of the shift sleeve.

[0016] A gear locking sleeve is fixed circumferentially on the shift shaft, and the gear locking sleeve is provided with a gear slot on its circumference. A spring ejector pin is installed on the housing, and the wedge-shaped pin head provided on the spring ejector pin corresponds to the gear slot. The gear can be positioned by the gear locking sleeve and the spring ejector pin, thereby avoiding the situation of disengagement. An axial blind hole is provided at the tail end of the spring ejector pin, and a compression spring is inserted into the axial blind hole. The bolt is used to press against the compression spring to form a limit, and a spacing is left between the spring ejector pin and the bolt. When the shift shaft rotates to drive the shift gear to mesh with the output bevel gear or the reverse gear bevel gear, the shift shaft will also drive the gear locking sleeve to rotate at the same time. When the reverse gear is switched to the forward gear, the spring ejector pin will first be subjected to pressure to cause the compression spring to contract, so that the spring ejector pin automatically gives way and moves out of the reverse gear slot. When the gear shift is successful, the pressure disappears, and the spring ejector pin is no longer subjected to pressure. Under the action of the compression spring, it will automatically insert into the forward gear slot of the gear locking sleeve to achieve the positioning of the forward gear. When the forward gear is changed to the reverse gear, the spring ejector pin will move from the forward gear slot of the gear lock sleeve to the reverse gear slot to realize the reverse gear positioning. This improves the accuracy of the gear shift and increases the reliability of the gear shift. The axial blind hole of the spring ejector pin can not only locate the compression spring, but also shorten the total length of the spring ejector pin, compression spring and bolt while ensuring the normal compression amount of the compression spring, which provides convenience for installation.

[0017] The outer wall of the box body is provided with an anti-misoperation mechanism, which includes a mounting seat and a limit pin. The mounting seat is provided with two brackets, and the limit pin is supported on the two brackets in a sliding manner. A return spring is sleeved on the shaft section of the limit pin between the two brackets. One end of the return spring abuts against one bracket, and the other end is limited by a retaining spring. One end of the limit pin extends to the bottom of the shift pedal to limit the misoperation of the shift pedal, and the other end of the limit pin is used to fix the control cable operated by the handle on the sidecar three-wheeled motorcycle. The anti-misoperation mechanism provides a guarantee for the driving of the sidecar three-wheeled motorcycle and improves the safety performance of the driving of the sidecar three-wheeled motorcycle. When shifting gears, the driver pulls the control cable through the handle, so that the control cable pulls the limit pin to shrink and make way under the shift pedal, and then the pedal is stepped on to change the gear. After the gear change is completed, the handle is released, and the limit pin will return to the bottom of the shift pedal under the action of the return spring to limit the rotation of the shift pedal, thereby avoiding misoperation during driving and providing convenience for driving.

[0018] A case cover is provided on one side of the case body, and the hollow shaft section of the output bevel gear extends outward from a bearing hole provided on the case cover, and an axially extending mounting column is provided on the case cover. During installation, the transmission is mounted on the engine through the threaded cooperation between the bolts and the threaded holes on the mounting column. The mounting column not only plays a connecting role, but also has a supporting role, ensuring that there is enough space between the transmission case body and the engine case body to install the output sprocket, which provides convenience for installation.

[0019] The major axis extension direction of the cam groove is oblique to the axial direction of the sliding fork tail, which can ensure that the sliding fork is driven by the shifting pin to move axially, and is also more conducive to the sliding of the shifting pin in the cam groove.

[0020] One end of the output sprocket is limited by a bushing sleeved on the hollow shaft section of the output bevel gear, and the other end is limited by a nut threadedly matched on the external thread section of the hollow shaft section, so the axial limitation of the output sprocket is good.

[0021] One end of the main shaft located in the shaft hole of the hollow shaft section of the output bevel gear is splined to an internal spline sleeve, and the internal spline sleeve is used to be splined to the engine output shaft. The engine output shaft is inserted into the shaft hole of the hollow shaft section of the output bevel gear, and the spline cooperates with the internal spline of the internal spline sleeve, so that the engine output shaft drives the main shaft, realizing the input of the reverse gear power. The internal spline sleeve not only realizes the power transmission between the main shaft and the engine output shaft, but also is easy to install.

[0022] The reverse gear of the sidecar motorcycle has a stable structure and reliable operation, and realizes the reverse gear of the sidecar motorcycle, which brings great convenience to the driving of the sidecar motorcycle. Moreover, it is driven by a chain, which increases the overload capacity and adaptability, and improves the safety performance of motorcycle driving.

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the anti-misoperation mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the shift fork;

[0027] Figure 4 for Figure 3 A top view of

[0028] Figure 5 It is a schematic diagram of the structure of the gear lock sleeve cooperating with the shift shaft and the ejector pin;

[0029] Figure 6 It is a schematic diagram of the structure of the mounting column of the box cover. DETAILED DESCRIPTION

[0030] See also Figures 1 to 6A reverse gear of a sidecar motorcycle comprises a housing 1, a main shaft 7 is supported in the cavity of the housing 1 by a bearing, and a shift gear 10 that can move axially is fixed on the main shaft 7 by a spline. A reverse gear bevel gear 11 is arranged on one side of the shift gear 10, and an output bevel gear 8 is arranged on the other side. The reverse gear bevel gear 11 and the output bevel gear 8 are respectively provided with coupling teeth engaged with the shift gear 10. A bridge bevel gear 9 is located between the reverse gear bevel gear 11 and the output bevel gear 8 and meshes with the reverse gear bevel gear 11 and the output bevel gear 8 respectively. The bridge bevel gear 9 is supported on the housing 1 by a bearing, and the housing 1 is provided with a hole for facilitating the installation of the bridge bevel gear 9 and for inserting the bridge bevel gear 9, and the hole is covered by a cover plate. The reverse gear bevel gear 11 is loosely sleeved on the main shaft 7 and slides with the main shaft 7, and the output bevel gear 8 is supported on the housing 1 by a bearing, and the output bevel gear 8 is provided with an axially extending hollow shaft section 8-1. One end of the hollow shaft section 8-1 extends outward from the housing 1, and an output sprocket 3 is fixed circumferentially on the extended end. One end of the main shaft 7 is supported in the shaft hole of the hollow shaft section 8-1 through a bearing, and is used to connect the engine output shaft 28. One end of the output sprocket 3 is limited by a bushing 5 sleeved on the hollow shaft section 8-1 of the output bevel gear 8, and the other end is limited by a nut 2 threadedly matched on the external threaded section provided on the hollow shaft section 8-1, so that the axial limit of the output sprocket 3 is good. One end of the main shaft 7 located in the shaft hole of the hollow shaft section 8-1 of the output bevel gear 8 is splined to an internal spline sleeve 4, and the internal spline sleeve 4 is used to be splined to the engine output shaft 28. The engine output shaft 28 is inserted into the shaft hole of the hollow shaft section 8-1 of the output bevel gear 8 and supported by a bearing. The inserted end of the engine output shaft 28 is matched with the internal spline of the internal spline sleeve 4 through the external spline, so that the engine output shaft 28 drives the main shaft 7, and the input of the reverse gear power is realized. An oil seal is provided between the engine output shaft 28 and the hollow shaft section 8-1, and between the main shaft 7 and the hollow shaft section 8-1. The inner spline sleeve 4 not only realizes the power transmission between the main shaft 7 and the engine output shaft 28, but also is easy to install. A case cover 6 is provided on one side of the case body 1, and the hollow shaft section 8-1 of the output bevel gear 8 extends outward from the bearing hole provided on the case cover 6, and an axially extending mounting column 26 is provided on the case cover 6. An oil seal is provided between the bushing 5 and the case cover 6. During installation, the transmission is installed on the engine through the threaded cooperation of the bolts and the threaded holes on the mounting column 26. The mounting column 26 not only plays a connecting role, but also has a supporting role, ensuring that there is enough space between the transmission case body 1 and the engine case body to install the output sprocket 3, which provides convenience for installation.

[0031] In addition, the housing 1 is provided with a shift shaft 15 parallel to the main shaft 7, a sliding fork 13 is provided on the shift shaft 15, and a fork head 13-2 of the sliding fork 13 is stuck in the annular groove 10-1 of the shift gear 10. The fork tail 13-1 of the sliding fork 13 is sleeved on the shift shaft 15, and a cam groove 13-3 is provided on the fork tail 13-1 of the sliding fork 13, and a shift pin 17 driven by the shift shaft 15 is inserted into the cam groove 13-3, which is used to drive the sliding fork 13 to move axially along the shift shaft 15. A shift sleeve 18 is axially positioned on the shift shaft 15 and is circumferentially fixed with a spline, and the shift sleeve 18 is slidably matched with the fork tail 13-1 of the sliding fork 13, and the shift pin 17 is fixedly installed on the shift sleeve 18. One end of the shift pin 17 is threadedly matched and fixed with the threaded hole provided on the shift sleeve 18, and the other end is inserted into the cam groove 13-3 of the fork tail 13-1 of the sliding fork 13. The fork tail 13-1 of the sliding fork 13 is in the shape of a shaft sleeve, and the shift sleeve 18 is located between the fork tail 13-1 of the sliding fork 13 and the shift shaft 15, which not only ensures the axial sliding of the sliding fork 13, but also increases the mechanical strength of the shift shaft 15. One end of the shift shaft 15 extends out of the housing 1 and is circumferentially fixedly connected to a shift pedal 14. An oil seal is provided between the shift shaft 15 and the housing 1. The shift pedal 14 includes a forward gear pedal and a reverse gear pedal that are symmetrically arranged. The major axis extension direction of the cam groove 13-3 is oblique to the axial direction of the fork tail of the sliding fork 13, which can ensure that the shift pin 18 drives the sliding fork 13 to move axially, and is also more conducive to the sliding of the shift pin 17 in the cam groove 13-3. The shift sleeve 18 is axially limited by the limiting sleeve 16 on the shift shaft 15. The limiting sleeve 16 is pressed between the shift sleeve 18 and the housing 1 to prevent the axial movement of the shift sleeve 18. A gear locking sleeve 19 is circumferentially fixed on the shift shaft 15 through a spline. The gear locking sleeve 19 is provided with a gear groove 19-1 on its circumference. A spring ejector pin 20 is installed on the housing 1. The spring ejector pin 20 is provided with a wedge-shaped pin head 20-1 corresponding to the gear groove 19-1. The gear locking sleeve 19-1 and the spring ejector pin 20 can be used to lock the gear, thereby avoiding the situation of disengagement. The tail end of the spring ejector pin 20 is provided with an axial blind hole, and a compression spring 21 is inserted into the axial blind hole. The bolt 12 is pressed against the compression spring 21 to form a limit. The bolt 12 is also provided with an axial blind hole for the compression spring 21 to be inserted. A spacing is left between the spring ejector pin 20 and the bolt 12, and the spacing allows the compression spring 21 to be elastically extended. The axial blind holes of the spring top pin 20 and the bolt 12 can not only position the compression spring 21, but also shorten the total length of the spring top pin 20, the compression spring 21 and the bolt 12 while ensuring the normal compression amount of the compression spring 21, which provides convenience for installation. The bolt 12 is threadedly connected with the housing 1. When the shift shaft 15 rotates to drive the shift gear 10 to mesh with the output bevel gear 8 or the reverse bevel gear 11, the shift shaft 15 will also drive the gear locking sleeve 19 to rotate.When the reverse gear is changed to the forward gear, the spring push pin 20 will first be subjected to pressure to cause the compression spring 21 to contract, so that the wedge-shaped pin head 20-1 of the spring push pin 20 automatically moves out of the reverse gear slot 19-1. When the gear shift is successful, the pressure disappears. At this time, the spring push pin 20 is no longer subjected to pressure, and the wedge-shaped pin head 20-1 will automatically insert into the forward gear slot 19-1 of the gear locking sleeve 19 under the action of the compression spring 21, so as to lock the forward gear. When the forward gear is changed to the reverse gear, the push pin 20 will move from the forward gear slot 19-1 of the gear locking sleeve 19 to the reverse gear slot 19-1, so as to lock the reverse gear. This improves the accuracy of the gear shift and increases the reliability of the gear shift. The outer wall of the box body 1 is provided with an anti-misoperation mechanism, which includes a mounting seat 24 and a limit pin 23. The mounting seat 24 is provided with two brackets 24-1. The limit pin 23 is supported on the two brackets 24-1 in a sliding manner. The limit pin 23 is located on the shaft section between the two brackets 24-1 and is sleeved with a return spring 25. One end of the return spring 25 abuts against one bracket, and the other end is limited by a retaining spring 22. One end of the limit pin 23 extends to the bottom of the shift pedal 14 to limit the misoperation of the shift pedal 14. The other end of the limit pin 23 is used to fix and connect the control cable 27 operated by the handle. The anti-misoperation mechanism provides a guarantee for the driving of the sidecar three-wheeled motorcycle and improves the safety performance of the sidecar three-wheeled motorcycle. When shifting gears, the driver pulls the control cable 27 through the handle of the sidecar three-wheeled motorcycle, so that the control cable 27 pulls the limit pin 23 to shrink and make way for the bottom of the shift pedal 14, and then steps on the shift pedal 14 to change the gear position. After the gear change is completed, the handle is released, and the limit pin 23 returns to its original position under the action of the return spring 25 and extends to the bottom of the shift pedal 14 to limit the rotation of the shift pedal 14, thereby avoiding misoperation during driving and providing convenience for driving.

[0032] During operation, the engine output shaft 28 of the sidecar motorcycle drives the main shaft 7 to rotate, and the main shaft 7 will drive the shift gear 10 to rotate together. The shift gear 10 is moved axially on the main shaft 7 by the sliding fork 13, and meshes with the output bevel gear 8 or the reverse gear bevel gear 11. When the coupling teeth of the shift gear 10 mesh with the coupling teeth of the output bevel gear 8, the reverse gear is in the forward gear, and the shift gear 10 will directly drive the output bevel gear 8 to rotate, and the output bevel gear 8 will drive the output sprocket 3 to rotate and drive the rear wheel of the sidecar motorcycle to rotate through the chain, so as to realize the forward movement of the sidecar motorcycle. When the coupling teeth of the shift gear 10 mesh with the reverse gear bevel gear 11, the shift gear 10 will drive the reverse gear bevel gear 11 to rotate, and the power is transmitted through the bridge bevel gear 9 to drive the output bevel gear 8 to rotate in the opposite direction, thereby driving the rear wheel of the motorcycle to rotate in the opposite direction through the sprocket, so as to realize the reverse gear of the sidecar motorcycle. The reverse gear has a forward gear and a reverse gear, and the power transmission of the forward gear and the reverse gear is stable and reliable, thereby realizing the forward and reverse movement of the sidecar three-wheeled motorcycle. It can bring convenience to the reverse movement of the sidecar three-wheeled motorcycle, and the driving of the sidecar three-wheeled motorcycle is also simpler and more labor-saving. The reverse position control is also convenient, and the reverse direction control is also easy, which provides great convenience for the driver. At the same time, the reverse gear outputs power through the output sprocket 3, realizing the chain drive of the sidecar three-wheeled motorcycle. The chain drive has high transmission efficiency, good environmental adaptability and long service life. In addition, the overload capacity of the chain drive is also good, which improves the safety performance of motorcycle driving. When shifting gears, the shift pedal 14 is stepped on by the foot, so that the shift pedal 14 drives the shift shaft 15 to rotate, and the shift shaft 15 will drive the toggle pin 17 to rotate together. Because the shift pin 17 is inserted in the cam groove 13-3 of the sliding fork 13, and the fork head 13-2 of the sliding fork 13 is located in the annular groove 10-1 of the shift gear 10, the circumferential rotation of the sliding fork 13 is restricted. Therefore, the rotating shift pin 17 will slide in the cam groove 13-3 to force the sliding fork 13 to slide axially along the shift shaft 15, thereby realizing the driving of the shift gear 10 by the sliding fork 13, realizing the meshing of the shift gear 10 with the output bevel gear 8 or the reverse bevel gear 11, and the shifting is stable and reliable.

Claims

1. A reverse gear of a sidecar motorcycle, characterized in that: The invention comprises a housing (1), wherein a main shaft (7) is supported in a cavity of the housing (1) via a bearing, a shift gear (10) is circumferentially fixed on the main shaft (7) and can be axially moved, a reverse gear bevel gear (11) is arranged on one side of the shift gear (10), and an output bevel gear (8) is arranged on the other side, the reverse gear bevel gear (11) and the output bevel gear (8) are respectively provided with engaging teeth for engaging with the shift gear (10), and a bridge bevel gear (9) is located between the reverse gear bevel gear (11) and the output bevel gear (8) and is respectively engaged with the reverse gear bevel gear (11) and the output bevel gear (8). 11), an output bevel gear (8) is meshed, the reverse gear bevel gear (11) is slidably fitted on the main shaft (7), the output bevel gear (8) is supported on the housing (1) through a bearing, the output bevel gear (8) is provided with an axially extending hollow shaft section (8-1), one end of the hollow shaft section (8-1) protrudes out of the housing (1), an output sprocket (3) is circumferentially fixed on the protruding end, a housing cover (6) is provided on one side of the housing (1), and the hollow shaft section (8-1) of the output bevel gear (8) is extended outward from a bearing hole provided on the housing cover (6) The housing (1) is provided with an axially extending mounting column (26), one end of the main shaft (7) is supported in the shaft hole of the hollow shaft section (8-1) through a bearing for connecting to the engine output shaft (28), the housing (1) is provided with a shift shaft (15) parallel to the main shaft (7), a sliding shift fork (13) is installed on the shift shaft (15), a fork head (13-2) of the sliding shift fork (13) is clamped in the annular groove (10-1) of the shift gear (10), and a fork tail (13-2) of the sliding shift fork (13) is clamped in the annular groove (10-1) of the shift gear (10), and a fork tail (13-2) of the sliding shift fork (13) is clamped in the annular groove (10-1) of the shift gear (10). The shift fork (13) is provided with a cam groove (13-3) on the fork tail (13-1) of the sliding shift fork (13), and the major axis of the cam groove (13-3) extends in a direction oblique to the axial direction of the fork tail of the sliding shift fork (13). A shift pin (17) driven by the shift shaft (15) is inserted into the cam groove (13-3) and is used to drive the sliding shift fork (13) to move axially along the shift shaft (15). One end of the shift shaft (15) extends out of the housing (1) and is circumferentially fixedly connected to a shift pedal (14).

2. The reverse gear of a sidecar motorcycle according to claim 1, characterized in that: A shift sleeve (18) is fixedly mounted on the shift shaft (15) in the axial positioning circumferential direction, and the shift sleeve (18) is slidably matched with the fork tail (13-1) of the sliding fork (13). A shift pin (17) is fixedly mounted on the shift sleeve (18), and the shift pin (17) is inserted into a cam groove (13-3) of the fork tail (13-1) of the sliding fork (13).

3. The reverse gear of the sidecar motorcycle according to claim 2, characterized in that: The shift sleeve (18) is axially limited by a limiting sleeve (16) sleeved on the shift shaft (15).

4. The reverse gear of a sidecar motorcycle according to claim 1, characterized in that: A gear locking sleeve (19) is circumferentially fixed on the gear shift shaft (15), the gear locking sleeve (19) being provided with a gear slot (19-1) on its circumference, and a spring ejector pin (20) is mounted on the housing (1), the spring ejector pin (20) being provided with a wedge-shaped pin head (20-1) corresponding to the gear slot (19-1).

5. The reverse gear of the sidecar motorcycle according to claim 4, characterized in that: An axial blind hole is provided at the rear end of the spring ejector pin (20), a compression spring (21) is inserted into the axial blind hole, and a bolt (12) is pressed against the compression spring (21) to form a limit position, with a spacing being left between the spring ejector pin (20) and the bolt (12).

6. The reverse gear of a sidecar motorcycle according to claim 1, characterized in that: An anti-misoperation mechanism is arranged on the outer wall of the box body (1), and the anti-misoperation mechanism comprises a mounting seat (24) and a limit pin (23). The mounting seat (24) is provided with two brackets (24-1). The limit pin (23) is supported on the two brackets (24-1) in a sliding manner. A return spring (25) is sleeved on the shaft section of the limit pin (23) located between the two brackets (24-1). One end of the return spring (25) abuts against one bracket, and the other end is limited by a retaining spring (22). One end of the limit pin (23) extends to the bottom of the shift pedal (14) to limit misoperation of the shift pedal (14). The other end of the limit pin (23) is used to be fixedly connected to a control cable (27) operated by a handle.

7. The reverse gear of a sidecar motorcycle according to claim 1, characterized in that: One end of the output sprocket (3) is limited by a bushing (5) sleeved on the hollow shaft section (8-1) of the output bevel gear (8), and the other end is limited by a nut (2) threadedly matched on an external thread section provided on the hollow shaft section (8-1).

8. The reverse gear of a sidecar motorcycle according to claim 1, characterized in that: One end of the main shaft (7) located in the shaft hole of the hollow shaft section (8-1) of the output bevel gear (8) is spline-connected to an internal spline sleeve (4), and the internal spline sleeve (4) is used for spline connection to the engine output shaft (28).

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