Part-time four-wheel drive transmission assembly for quad bike

Abstract

A part-time four-wheel drive transmission assembly for a quad bike, comprising a reverse gearbox for the motorcycle. One side of the reverse gearbox housing is fixedly connected to a part-time four-wheel drive transmission box. The output main shaft of the reverse gearbox extends outward through the part-time four-wheel drive transmission box. A part-time drive rotating shaft is arranged and extends outward in the part-time four-wheel drive transmission box. The part-time drive rotating shaft is parallel to the output main shaft and extends in the opposite direction. An intermediate shaft is arranged in the part-time four-wheel drive transmission box. A driving gear is circumferentially fixed on the output main shaft and meshes with an intermediate gear on the intermediate shaft. A driven gear is sleeved loosely on the part-time drive rotating shaft and meshes with the intermediate gear. A four-wheel drive clutch gear is circumferentially fixed on the part-time drive rotating shaft and can move axially. A fork shaft that moves axially is slidably fitted in the part-time four-wheel drive transmission box and extends outward at one end. The four-wheel drive switching fork fixedly connected to the fork shaft is snap-fitted in the annular groove of the four-wheel drive clutch gear. A return spring is sleeved on the fork shaft and is located between the four-wheel drive switching fork and the box wall that supports the outer end of the fork shaft.

Description

Technical Field

[0001] The present invention relates to the field of motorcycle reverse gears, and particularly to a time-sharing four-wheel drive transmission assembly for a four-wheel motorcycle. Background Art

[0002] The speed change mechanism provided in the crankcase of a motorcycle engine is designed for two-wheel motorcycles, and the existing speed change mechanisms of motorcycle engines do not have a reverse gear function. Currently, in order for three-wheel or four-wheel motorcycles using motorcycle engines to be able to reverse, a dedicated reverse gear for realizing the forward or reverse driving conversion is installed. This reverse gear is installed outside the crankcase of the motorcycle engine and is connected to the output shaft of the speed change mechanism of the motorcycle engine, so that the power output by the engine speed change mechanism is switched through the reverse gear and transmitted to the rear wheel drive axle by the reverse gear through a transmission shaft, thereby realizing the forward or reverse driving of the three-wheel or four-wheel motorcycle. However, the existing structure of the motorcycle reverse gear has only one output shaft to output driving power, and usually can only realize two-wheel drive of the rear wheels, and cannot realize four-wheel drive of the front and rear wheels. If the four-wheel drive is realized by improving the front and rear wheel transmission shaft structures of the four-wheel motorcycle, only full-time four-wheel drive can be achieved for the four-wheel motorcycle, and time-sharing four-wheel drive cannot be realized, resulting in an increase in the driving fuel consumption and exhaust emissions of the four-wheel motorcycle, which is not conducive to energy conservation and environmental protection. Summary of the Invention

[0003] The purpose of the present invention is to provide a time-sharing four-wheel drive transmission assembly for a four-wheel motorcycle in view of the deficiencies of the existing technology, which can enable the motorcycle reverse gear to realize time-sharing four-wheel drive transmission and output power.

[0004] The technical solution of the present invention is realized as follows:

[0005] A part-time four-wheel drive transmission assembly for a quad bike, including a motorcycle reverse gear. One side of the motorcycle reverse gear housing is fixedly connected to a part-time four-wheel drive transmission box. The output main shaft of the motorcycle reverse gear passes through the part-time four-wheel drive transmission box and extends outward. A part-time drive rotating shaft is arranged in the part-time four-wheel drive transmission box and extends outward. The part-time drive rotating shaft is parallel to the output main shaft and has the opposite extending direction. An intermediate shaft parallel to the output main shaft is arranged in the part-time four-wheel drive transmission box. An intermediate gear is arranged on the intermediate shaft. A driving gear is circumferentially fixed on the output main shaft and meshes with the intermediate gear. A driven gear is sleeved on the part-time drive rotating shaft and meshes with the intermediate gear. A four-wheel drive clutch gear is axially movable and circumferentially fixed on the part-time drive rotating shaft, and is combined with or separated from the driven gear by axial movement. An annular groove surrounding the circumference is arranged on the four-wheel drive clutch gear. An axially movable fork shaft is slidably fitted in the part-time four-wheel drive transmission box, parallel to the part-time drive rotating shaft and with one end extending outward for connecting a control mechanism. The four-wheel drive switching fork fixedly connected to the fork shaft is snap-fitted in the annular groove of the four-wheel drive clutch gear. A return spring is sleeved on the fork shaft and is located between the four-wheel drive switching fork and the box wall supporting the outer extending end of the fork shaft.

[0006] The output main shaft of the motorcycle reverse gear is respectively supported by bearings on the reverse gear housing and the part-time four-wheel drive transmission box. The part-time drive rotating shaft and the intermediate shaft are respectively supported by bearings on the part-time four-wheel drive transmission box.

[0007] The intermediate shaft is a spline shaft, and the intermediate gear is spline-fitted with the intermediate shaft.

[0008] The part-time drive rotating shaft is provided with a spline section. The four-wheel drive clutch gear is spline-fitted on the spline section. The four-wheel drive clutch gear is provided with engaging external teeth. The end of the driven gear facing the four-wheel drive clutch gear is provided with engaging internal teeth for meshing with the engaging external teeth of the four-wheel drive clutch gear during four-wheel drive.

[0009] The part-time four-wheel drive transmission box includes a box body and a box cover. The box body is fixedly connected to the motorcycle reverse gear housing by bolts. The box cover is fixedly connected to the box body by bolts. The output main shaft of the motorcycle reverse gear is respectively supported by bearings on the reverse gear housing and the box body and box cover of the part-time four-wheel drive transmission box. The intermediate shaft and the part-time drive rotating shaft are respectively supported by bearings on the box body and box cover of the part-time four-wheel drive transmission box.

[0010] The outer extending end of the output main shaft is fixedly connected to a first universal joint coupling for connecting a rear drive shaft. The outer extending end of the part-time drive rotating shaft is fixedly connected to a second universal joint coupling for connecting a front drive shaft.

[0011] The reverse gear of the motorcycle includes a forward gear bevel gear, a reverse gear bevel gear, an input bevel gear, and an output main shaft. The output main shaft is supported by bearings in the reverse gear housing, and one end of the output main shaft extends out of the reverse gear housing. The forward gear bevel gear and the reverse gear bevel gear are located in the reverse gear housing and are sleeved on the output main shaft in a facing and idle manner. The input bevel gear is supported by bearings in the reverse gear housing and meshes with the forward gear bevel gear and the reverse gear bevel gear. The facing ends of the forward gear bevel gear and the reverse gear bevel gear are both provided with engaging internal teeth. A shift engaging gear is located between the facing ends of the forward gear bevel gear and the reverse gear bevel gear and is splined to the output main shaft so as to be axially movable. A shift fork is stuck in a ring groove provided on the shift engaging gear. The shift fork is fixedly connected to a fork rotating shaft, and one end of the fork rotating shaft extends out of the reverse gear housing and is fixedly connected to a shift pedal.

[0012] With the above solution, a part-time four-wheel drive transmission box is fixedly connected to one side of the reverse gear housing of the motorcycle. The output main shaft of the motorcycle reverse gear passes through the part-time four-wheel drive transmission box and extends outwards. A part-time drive rotating shaft is provided in the part-time four-wheel drive transmission box and extends outwards. The part-time drive rotating shaft is parallel to the output main shaft and extends in the opposite direction. An intermediate shaft parallel to the output main shaft is provided in the part-time four-wheel drive transmission box. An intermediate gear is provided on the intermediate shaft. A driving gear is circumferentially fixed on the output main shaft and meshes with the intermediate gear. A driven gear is sleeved on the part-time drive rotating shaft in an idle manner and meshes with the intermediate gear. A four-wheel drive clutch gear is circumferentially fixed on the part-time drive rotating shaft so as to be axially movable, and is combined with or separated from the driven gear by axial movement. An annular groove is provided around the circumference of the four-wheel drive clutch gear. A fork shaft that moves axially is slidably fitted in the part-time four-wheel drive transmission box, is parallel to the part-time drive rotating shaft, and one end extends outwards for connecting a control mechanism. The four-wheel drive switching fork fixedly connected to the fork shaft is snap-fitted in the annular groove of the four-wheel drive clutch gear. A return spring is sleeved on the fork shaft and is located between the four-wheel drive switching fork and the box wall that supports the outer extending end of the fork shaft. Thereby, the power output by the motorcycle reverse gear can be transmitted to the rear drive axle of the four-wheel motorcycle through the output main shaft for two-wheel drive of the rear wheels, and at the same time, the power is transmitted from the driving gear through the intermediate gear to the driven gear that is sleeved on the part-time drive rotating shaft in an idle manner. The four-wheel drive clutch gear on the part-time drive rotating shaft is axially moved by the four-wheel drive switching fork to be combined with the driven gear, and the power transmitted by the driven gear is transmitted to the front drive axle through the four-wheel drive clutch gear and the part-time drive rotating shaft for two-wheel drive of the front wheels. And due to the tension of the return spring, after the control force of the four-wheel drive switching fork is released, the four-wheel drive switching fork is pushed back by the return spring to drive the four-wheel drive clutch gear to be separated from the driven gear, interrupting the power transmission from the part-time drive rotating shaft to the front drive axle, so that the four-wheel motorcycle realizes the part-time four-wheel drive function.

[0013] The present invention provides a part-time four-wheel drive transmission case on a reverse gear of a motorcycle. The output main shaft of the reverse gear and the part-time drive rotating shaft of the part-time four-wheel drive transmission case are used to transmit power to the rear drive axle and the front drive axle of the four-wheel motorcycle respectively. The four-wheel drive part-time transmission of the four-wheel motorcycle is realized by controlling the engagement or separation of the four-wheel drive clutch gear and the driven gear through a four-wheel drive switching fork. The four-wheel drive and two-wheel drive can be switched according to the driving needs of the four-wheel motorcycle, so that the four-wheel motorcycle can enhance its climbing ability through four-wheel drive, and at the same time, the four-wheel motorcycle can reduce the driving fuel consumption and exhaust emissions through two-wheel drive, which is beneficial to energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross-sectional structure view of the present invention;

[0015] Figure 2 is Figure 1 the sectional view taken along the line A-A of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] See Figure 1 and Figure 2, A part-time four-wheel drive transmission assembly for a quad bike, including a motorcycle reverse gear. The motorcycle reverse gear in this embodiment includes a forward gear bevel gear 7, a reverse gear bevel gear 3, an input bevel gear 19, and an output main shaft 2. The output main shaft 2 is supported by bearings in the reverse gear housing 1, and one end of the output main shaft 2 extends out of the reverse gear housing 1. The forward gear bevel gear 7 and the reverse gear bevel gear 3 are located inside the reverse gear housing 1 and are sleeved on the output main shaft 2 in a facing and idle manner. The input bevel gear 19 is located on the side of the mounting plate 6 provided on the reverse gear housing 1, is supported by bearings in the reverse gear housing 1, and meshes with the forward gear bevel gear 7 and the reverse gear bevel gear 3. The mounting plate 6 is used to be fixedly connected to the engine by bolts, and the input bevel gear 19 is used to be spline-fitted with the output shaft of the engine through the provided internal spline. The facing ends of the forward gear bevel gear 7 and the reverse gear bevel gear 3 are both provided with engaging internal teeth. A shift engaging gear 4 is located between the facing ends of the forward gear bevel gear 7 and the reverse gear bevel gear 3 and is spline-fitted on the output main shaft 2 so as to be axially movable. A shift fork 5 is stuck in a ring groove provided on the shift engaging gear 4. The shift fork 5 is fixedly connected to a fork rotating shaft 23, and one end of the fork rotating shaft 23 extends out of the reverse gear housing 1 and is fixedly connected to a shift pedal (not shown). Of course, the motorcycle reverse gear is not limited to the structure of this embodiment and can also be a motorcycle reverse gear with other structures. A part-time four-wheel drive transmission box is fixedly connected to one side of the reverse gear housing 1 of the motorcycle. The output main shaft 2 of the motorcycle reverse gear passes through the part-time four-wheel drive transmission box and extends outwards. A part-time drive rotating shaft 17 is provided in the part-time four-wheel drive transmission box and extends outwards. The part-time drive rotating shaft 17 is parallel to the output main shaft 2 and has an opposite extending direction. An intermediate shaft 12 parallel to the output main shaft is provided in the part-time four-wheel drive transmission box. The output main shaft 2 of the motorcycle reverse gear is respectively supported by bearings in the reverse gear housing 1 and the part-time four-wheel drive transmission box. The part-time drive rotating shaft 17 and the intermediate shaft 12 are respectively supported by bearings in the part-time four-wheel drive transmission box. To facilitate the assembly of the part-time four-wheel drive transmission assembly, the part-time four-wheel drive transmission box includes a box body 8 and a box cover 9. The box body 8 is fixedly connected to the reverse gear housing 1 of the motorcycle by bolts. The box cover 9 is fixedly connected to the box body 8 by bolts. The output main shaft 2 of the reverse gear is respectively supported by bearings in the reverse gear housing 1 and the box body 8 and the box cover 9 of the part-time four-wheel drive transmission box. The intermediate shaft 12 and the part-time drive rotating shaft 17 are respectively supported by bearings in the box body 8 and the box cover 9 of the part-time four-wheel drive transmission box. An intermediate gear 13 is provided on the intermediate shaft 12. In this embodiment, the intermediate shaft 12 is a spline shaft, and the intermediate gear 13 is spline-fitted with the intermediate shaft 12. Of course, the intermediate gear can also be a gear shaft integrally formed with the intermediate shaft, or the intermediate shaft is a smooth shaft, and the intermediate gear is slidably fitted on the smooth shaft.The output main shaft 2 has a driving gear 10 circumferentially fixed on the shaft section in the part-time four-wheel drive transfer case and meshed with an intermediate gear 12. A driven gear 16 is sleeved on the part-time drive rotating shaft 17 and meshed with the intermediate gear 12. A four-wheel drive clutch gear 14 is circumferentially fixed on the part-time drive rotating shaft 17 and can axially move, and is combined with or separated from the driven gear 16 by axial movement. The part-time drive rotating shaft 17 of this embodiment is provided with a spline section. The four-wheel drive clutch gear 14 is fitted on the spline section by spline. The four-wheel drive clutch gear 14 is provided with engaging external teeth. The end of the driven gear 16 facing the four-wheel drive clutch gear 14 is provided with engaging internal teeth for meshing with the engaging external teeth of the four-wheel drive clutch gear 14 during four-wheel drive. The four-wheel drive clutch gear 14 is provided with an annular groove around the circumference. A axially movable fork shaft 21 is slidably fitted in the part-time four-wheel drive transfer case, parallel to the part-time drive rotating shaft 17, and one end extends out for connecting the operating mechanism. A four-wheel drive switching fork 15 fixedly connected to the fork shaft 21 is snap-fitted in the annular groove of the four-wheel drive clutch gear 14. A return spring 20 is sleeved on the fork shaft 21 and is located between the four-wheel drive switching fork 15 and the wall of the box body 8 supporting the extended end of the fork shaft. To facilitate the part-time switching operation between two-wheel drive and four-wheel drive, a radial through hole is provided at the extended end of the fork shaft 21 for connecting the control cable. A fixed bracket 22 of a control cable is fixedly installed on the box body 8 of the part-time four-wheel drive transfer case, beside the extended end of the fork shaft 21.

[0017] The present invention is not limited to the above embodiments. To facilitate the assembly and connection with the drive shafts of the front and rear drive axles of the four-wheel motorcycle, the extended end of the output main shaft 2 is fixedly connected with a first universal joint coupling 11 for connecting the rear drive shaft to transmit power to the rear drive axle. The extended end of the part-time drive rotating shaft 17 is fixedly connected with a second universal joint coupling 16 for connecting the front drive shaft to transmit power to the front drive axle.

[0018] When the four-wheel motorcycle's part-time four-wheel drive transmission assembly is working, due to the tension of the return spring 20 between the four-wheel drive shift fork 15 and the wall of the housing 8 at the outer extended end of the support shift fork shaft, the four-wheel drive shift fork 15 normally moves the four-wheel drive clutch gear 14 to a position separated from the driven gear 16. The power transmission between the driven gear 16 and the four-wheel drive clutch gear 14 is in an interrupted state, and the four-wheel motorcycle is in the normal state of rear-wheel two-wheel drive. In the rear-wheel two-wheel drive state, the power output by the motorcycle engine is transmitted to the forward gear bevel gear 7 and the reverse gear bevel gear 3 in the reverse gear through the input bevel gear 19 of the motorcycle reverse gear at the same time. The shift fork 5 moves the shift engagement gear 4 to engage with the forward gear bevel gear 7 or the reverse gear bevel gear 3, driving the output main shaft 2 to rotate. The output main shaft 2 drives the driven gear 16 to idle on the part-time drive rotating shaft 17 through the driving gear 10 and the intermediate gear 12. When the driver uses the shift foot pedal to control the shift engagement gear 4 to engage with the forward gear bevel gear 7 through the shift fork 5, the forward gear bevel gear 7 transmits the power to the output main shaft 2 through the shift engagement gear 4. The output main shaft 2 transmits the power to the rear drive axle of the four-wheel motorcycle, driving the two rear wheels to rotate, and the four-wheel motorcycle is in two-wheel drive forward; when the driver uses the shift foot pedal to control the shift engagement gear 4 to engage with the reverse gear bevel gear 3 through the shift fork 5, the reverse gear bevel gear 3 transmits the power to the output main shaft 2 through the shift engagement gear 4. The output main shaft 2 transmits the power to the rear drive axle of the four-wheel motorcycle, driving the two rear wheels to rotate, and the four-wheel motorcycle is in two-wheel drive reverse. Once the four-wheel motorcycle needs to drive in four-wheel drive, the driver operates the control cable to pull the shift fork shaft 21 to move axially, so that the four-wheel drive shift fork 15 moves the four-wheel drive clutch gear 14 to engage with the driven gear 16. The driven gear 16 transmits the power to the part-time drive rotating shaft 17 through the four-wheel drive clutch gear 14. The part-time drive rotating shaft 17 transmits the power to the front drive axle of the four-wheel motorcycle, driving the two front wheels to rotate and participate in the driving of the four-wheel motorcycle. At this time, the combined state of the four-wheel drive clutch gear 14 and the driven gear 16 is maintained by the tension of the control cable. In this way, the power output by the engine drives the front and rear wheels of the four-wheel motorcycle to drive simultaneously, forming a four-wheel drive state. If you want to return to the rear-wheel two-wheel drive, just release the tension of the control cable. The return spring 20 pushes the four-wheel drive shift fork 15 to drive the four-wheel drive clutch gear 14 to return to a position separated from the driven gear 16, interrupting the power transmitted by the engine to the part-time drive rotating shaft 17, and the four-wheel motorcycle returns to the rear-wheel two-wheel drive state again. Thus, the four-wheel motorcycle can realize the part-time four-wheel drive function through the transmission switching of the part-time four-wheel drive transmission assembly.

Claims

1. A part-time four-wheel drive transmission assembly for a four-wheel motorcycle, including a motorcycle reverse gearbox, Characterized in that: The motorcycle reverse gearbox includes a forward gear bevel gear, a reverse gear bevel gear, an input bevel gear, and an output main shaft. The output main shaft is supported by bearings in the reverse gearbox housing, and one end of the output main shaft extends out of the reverse gearbox housing. The forward gear bevel gear and the reverse gear bevel gear are located in the reverse gearbox housing and are sleeved on the output main shaft in a facing and idle manner. The input bevel gear is located on the side of the mounting plate provided in the reverse gearbox housing, is supported by bearings in the reverse gearbox housing, and meshes with the forward gear bevel gear and the reverse gear bevel gear. The mounting plate is used to be fixedly connected to the engine by bolts. The facing ends of the forward gear bevel gear and the reverse gear bevel gear are both provided with engaging internal teeth. A shift engaging gear is located between the facing ends of the forward gear bevel gear and the reverse gear bevel gear, is splined on the output main shaft for axial movement, and a shift fork is stuck in a ring groove provided on the shift engaging gear. The shift fork is fixedly connected to a fork rotating shaft; One side of the reverse gearbox housing of the motorcycle is fixedly connected to a part-time four-wheel drive transmission box. The output main shaft of the motorcycle reverse gearbox extends out through the part-time four-wheel drive transmission box. A part-time drive rotating shaft is provided in the part-time four-wheel drive transmission box and extends outwards. The part-time drive rotating shaft is parallel to the output main shaft and has an opposite extension direction. An intermediate shaft parallel to the output main shaft is provided in the part-time four-wheel drive transmission box. An intermediate gear is provided on the intermediate shaft. A driving gear is circumferentially fixed on the output main shaft and meshes with the intermediate gear. A driven gear is sleeved on the part-time drive rotating shaft in an idle manner and meshes with the intermediate gear. A four-wheel drive clutch gear is circumferentially fixed on the part-time drive rotating shaft for axial movement and is combined or separated from the driven gear by axial movement. The part-time drive rotating shaft is provided with a spline section. The four-wheel drive clutch gear is splined on the spline section. The four-wheel drive clutch gear is provided with engaging external teeth. The end of the driven gear facing the four-wheel drive clutch gear is provided with engaging internal teeth for meshing with the engaging external teeth of the four-wheel drive clutch gear during four-wheel drive. An annular groove is provided around the circumference of the four-wheel drive clutch gear. A axially moving fork shaft is slidably fitted in the part-time four-wheel drive transmission box, is parallel to the part-time drive rotating shaft, and one end extends outwards for connecting a control mechanism. The four-wheel drive switching fork fixedly connected to the fork shaft is snap-fitted in the annular groove of the four-wheel drive clutch gear. A return spring is sleeved on the fork shaft and is located between the four-wheel drive switching fork and the box wall supporting the outer extending end of the fork shaft.

2. The part-time four-wheel drive transmission assembly for a four-wheel motorcycle according to claim 1, Characterized in that: The output main shaft of the motorcycle reverse gearbox is respectively supported by bearings in the reverse gearbox housing and the part-time four-wheel drive transmission box. The part-time drive rotating shaft and the intermediate shaft are respectively supported by bearings in the part-time four-wheel drive transmission box.

3. The part-time four-wheel drive transmission assembly for a four-wheel motorcycle according to claim 1 or 2, Characterized in that: The intermediate shaft is a spline shaft, and the intermediate gear is splined to the intermediate shaft.

4. The part-time four-wheel drive transmission assembly for a four-wheel motorcycle according to claim 1, Characterized in that: The time-sharing four-wheel drive transfer case includes a case body and a case cover. The case body is fixedly connected to the motorcycle reverse gear housing by bolts, and the case cover is fixedly connected to the case body by bolts. The output main shaft of the motorcycle reverse gear is respectively supported by bearings on the reverse gear housing and the case body and case cover of the time-sharing four-wheel drive transfer case. The intermediate shaft and the time-sharing drive rotating shaft are respectively supported by bearings on the case body and case cover of the time-sharing four-wheel drive transfer case.

5. The time-sharing four-wheel drive transmission assembly of the four-wheel motorcycle according to claim 1, characterized in that: The outer extending end of the output main shaft is fixedly connected with a first universal joint coupling for connecting the rear transmission shaft, and the outer extending end of the time-sharing drive rotating shaft is fixedly connected with a second universal joint coupling for connecting the front transmission shaft.

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