Snowmobile gear shifting structure

Abstract

The invention discloses a snowmobile gear shifting structure, and belongs to the field of snowmobiles, the snowmobile gear shifting structure comprises a box body, a gear shifting support and a gear shifting assembly are mounted on the box body, a gear shifting limiting opening is formed in the gear shifting support, the gear shifting limiting opening comprises a gear shifting channel, a parking opening is connected to the gear shifting channel, and the parking opening intersects with the gear shifting channel; a gear entering opening and a gear reversing opening are formed in the two sides of the parking opening correspondingly, the gear entering opening and the gear reversing opening both intersect and communicate with the gear shifting channel, and due to the fact that the gear shifting assembly needs to move in the gear shifting channel during gear shifting, the gear shifting assembly does not stay in the gear shifting channel before and after gear shifting and is located in the gear entering opening or the gear reversing opening or the parking opening; therefore, mistaken gear shifting caused by mistaken touch is avoided, and the problem that in the prior art, mistaken touch or gear shifting failure is prone to occurring when the snowmobile shifts gears by shifting the gear shifting rod front and back is solved.

Description

Technical Field

[0001] The invention relates to the field of snowmobiles, and in particular to a gear shifting structure of a snowmobile. Background Art

[0002] In the prior art, when a snowmobile is shifting gears, the shifting action is completed by moving the handle forward and backward. However, shifting gears in this way is prone to accidental touches, and if the shifting range is not enough, it is easy to cause a gear shift failure.

[0003] For example, the "snowmobile speed change mechanism" disclosed in the Chinese patent literature, with the announcement number CN202222623518.3, includes a gearbox, which carries a control assembly, an input assembly, a driven assembly and an output assembly, and the input assembly, the driven assembly and the output assembly are connected in a matching manner, and the control assembly is matched with the input assembly. The input assembly includes an input shaft, one end of which passes through the box body, and the through end is connected to the power device, and the other end of the input shaft is matched with the box cover. Close to the box cover, the input shaft is covered with a sliding gear that can slide relatively along the input shaft, and close to the box body, the input shaft is rotatably connected to the input wheel, and the sliding gear is matched with the input wheel. The shortcoming of this patent is that the gearbox achieves gear shifting by toggling its adjustment component back and forth, which is prone to accidental touch, or gear shifting failure due to insufficient toggling amplitude. Summary of the invention

[0004] The present invention aims to overcome the problem in the prior art that a snowmobile shifts gears by moving a shift lever forward and backward, which is prone to accidental contact or gear shift failure. A snowmobile shift structure is provided, which is not prone to accidental contact and can ensure that the gear shift is in place, making the gear shift process more reliable.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a snowmobile shift structure, comprising a box body, a shift bracket and a shift assembly are installed on the box body, a shift bracket is provided with a shift limit opening, the shift limit opening comprises a shift channel, a parking opening is connected to the shift channel, the parking opening intersects with the shift channel, a shift entry opening and a reverse gear opening are respectively provided on both sides of the parking opening, the shift entry opening and the reverse gear opening both intersect with and are connected to the shift channel.

[0006] In the present application, the shift assembly needs to move in the shift channel when shifting gears, and the shift assembly will not stay in the shift channel before and after the shifting gears, but will be located in the gear entry port, reverse gear port or parking port, so that wrong shifting will not occur due to accidental touch. In addition, during the shifting process, after moving the shift assembly in the shift channel, the shift assembly needs to be stuck in the gear entry port or reverse gear port, so the operator can ensure that the gear shift is in place.

[0007] Preferably, the shift assembly includes a shift lever and a shift handle, the shift handle is rotatably connected to the housing via a handle shaft, a shift shaft perpendicular to the handle shaft is fixedly mounted on the shift handle, and the shift lever is rotatably connected to the shift shaft. Since the handle shaft is perpendicular to the shift shaft, the shift process will not be controlled when the handle swings forward and backward, and the shift process will only be controlled when the handle swings horizontally.

[0008] Preferably, the shift handle includes a shaft mounting seat located in the middle thereof, the shift shaft is mounted on the shaft mounting seat, the shaft mounting seat includes two shaft mounting surfaces, the shift shaft passes through the two shaft mounting surfaces, and one end of the shift rod is located between the two shaft mounting surfaces. The shaft mounting seat can be used to make the connection position between the shift shaft and the shift rod located in the middle of the shift shaft, thereby improving transmission reliability.

[0009] Preferably, a first torsion spring is installed on the shift shaft, and the first torsion spring includes a handle reset portion that abuts against the shift handle. The first torsion spring can realize automatic reset of the shift handle in the front-rear direction, thereby ensuring that the shift handle can automatically reset from the shift channel to the entry port, the reverse port or the parking port, thereby ensuring that the shift is in place.

[0010] Preferably, the shift lever comprises a length adjustment rod and connectors installed at both ends of the length adjustment rod, and an adjustment nut is installed at the connection between the connector and the length adjustment rod. The length adjustment rod can make the length of the shift lever adjustable, so that the installation process will not be difficult due to dimensional accuracy or there will be a large stress after installation.

[0011] Preferably, a speed change shaft is installed in the housing, an advance gear wheel and a reverse gear wheel are installed on the speed change shaft, a shift wheel is arranged between the advance gear wheel and the reverse gear wheel, a control shaft for controlling the shift wheel to move in the axial direction of the speed change shaft is also installed on the housing, and the control shaft is connected to the shift lever. By moving the shift wheel on the speed change shaft, the forward gear and the reverse gear can be switched.

[0012] Preferably, the control shaft and the shift lever are connected via a flexible connection seat, and the shift lever is rotatably connected to the flexible connection seat. The flexible connection seat prevents the movement of the shift lever from causing a large impact on the control shaft and the shift wheel, and when the positions of the shift wheel and the forward and reverse gear wheels do not correspond, the flexible connection seat can delay transmission, and the shift wheel and the forward and reverse gear wheels can be meshed after the control shaft rotates a certain angle.

[0013] Preferably, a transmission part is provided on one end of the control shaft, a folding part is provided on the transmission part, a rotating bayonet adapted to the folding part is provided on the flexible connection seat, and a second torsion spring is installed between the transmission part and the flexible connection seat. The second torsion spring can realize the buffering and delayed transmission functions of the flexible connection seat.

[0014] Preferably, the shift wheel is provided with an annular groove in the circumferential direction, and a control claw is mounted on the control shaft, and the control claw includes two claw heads located in the annular groove. Through the control claw, the rotation of the control shaft can drive the shift wheel to move in the axial direction of the speed change shaft.

[0015] Preferably, the shift wheel is provided with an advance gear transmission block on the side facing the advance gear wheel, and the shift wheel is provided with a reverse gear transmission block on the side facing the reverse gear wheel. The advance gear wheel is provided with an advance gear slot adapted to the advance gear transmission block, and the reverse gear wheel is provided with a reverse gear slot adapted to the reverse gear transmission block. Through the cooperation of the transmission block and the slot, the shift wheel can drive the advance gear wheel or the reverse gear wheel to rotate synchronously when it is at different axial positions of the speed change shaft. When the advance gear wheel rotates, the snowmobile moves forward, and when the reverse gear wheel rotates, the snowmobile moves backward.

[0016] Therefore, the present invention has the following beneficial effects: (1) the gear shifting is not easy to be accidentally touched; (2) the gear shift handle can be automatically reset when it is not in place, thereby ensuring that the gear shift is in place, making the gear shifting process more reliable; (3) the buffer structure reduces the structural stress after installation and is not easy to be damaged; (4) the delayed transmission effect avoids the sense of frustration during the gear shifting process, making the gear shifting process smoother and more comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the shift bracket of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the shift assembly of the present invention.

[0020] Figure 4 It is a structural schematic diagram of a speed change assembly according to an embodiment of the present invention.

[0021] Figure 5 It is a structural schematic diagram of a speed change assembly according to embodiment 2 of the present invention.

[0022] In the figure: box body 1 side support frame 2 upper frame 3 shift channel 4 parking port 5 shift port 6 reverse port 7 shift lever 8 shift handle 9 shift shaft 10 grip head 11 movable rod 12 shaft mounting seat 13 handle rotation connector 14 first torsion spring 15 speed change shaft 16 shift wheel 17 reverse wheel 18 shift wheel 19 control claw 20 flexible connecting seat 21 second torsion spring 22. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1-4 In the illustrated embodiment 1, a snowmobile shift structure includes a housing 1, a speed change assembly is installed inside the housing 1, and a shift bracket and a shift assembly are installed outside the housing 1.

[0025] The shift bracket includes a side support frame 2 and an upper frame 3. The side support frame 2 includes a right side, a left side and a rear side. The right side and the left side are connected by the rear side. The right side, the left side and the rear side are all provided with weight-reducing holes for reducing weight, thereby reducing the overall weight. The right side and the left side are both fixedly mounted on the box body 1. The upper frame 3 includes a rear mounting plate and an upper functional plate. The rear mounting plate is fixedly connected to the rear side of the side support frame 2.

[0026] The upper functional panel is provided with a shift limit opening. The shift limit opening is in the shape of the letter E, and includes a shift channel 4 arranged transversely, a parking opening 5 is connected at the midpoint of the shift channel 4, the parking opening 5 intersects with the shift channel 4, and a gear entry opening 6 and a reverse gear opening 7 are respectively provided on both sides of the parking opening 5, the gear entry opening 6 and the reverse gear opening 7 both intersect with and communicate with the shift channel 4, and the gear entry opening 6 and the reverse gear opening 7 are respectively connected at both ends of the shift channel 4. The length directions of the gear entry opening 6 and the reverse gear opening 7 are both perpendicular to the direction of the shift channel 4, that is, the directions of the gear entry opening 6 and the reverse gear opening 7 are both located in the front and rear directions of the vehicle.

[0027] The shift assembly includes a shift rod 8 and a shift handle 9. The shift handle 9 is rotatably connected to the housing 1 via a handle shaft, a shift shaft 10 perpendicular to the handle shaft is fixedly mounted on the shift handle 9, and the shift rod 8 is rotatably connected to the shift shaft 10.

[0028] The shift handle 9 includes a grip head 11, a movable rod 12, a shaft mounting seat 13, and a handle rotating connector 14 from top to bottom. The size and shape of the grip head 11 conform to the ergonomic design, which is convenient for the operator to hold with his hand. The movable rod 12 passes through the shift limit opening. The movable rod 12 is a crank structure. The width of the movable rod 12 is directly adapted to the parking opening 5, the gear entry opening 6, and the reverse gear opening 7 of the shift limit opening. When the movable rod 12 is located in the parking opening 5, the gear entry opening 6 or the reverse gear opening 7, the entire shift handle 9 is limited and can only move in the direction of exiting the above-mentioned bayonet, and will not shake in multiple directions. The movement of the shift handle 9 in the direction of exiting the bayonet will not drive the shifting process. This part of the structure also reflects the effect that the shifting of the present application is not easy to be accidentally touched.

[0029] The shift handle 9 includes a shaft mounting seat 13 located in the middle thereof, and the shift shaft 10 is mounted on the shaft mounting seat 13. The shaft mounting seat 13 is in the shape of a square frame, and includes two opposite shaft mounting surfaces and two opposite connection mounting surfaces. The shift shaft 10 passes through the two shaft mounting surfaces, and one end of the shift rod 8 is located between the two shaft mounting surfaces and is rotatably connected to the shift shaft 10. One of the two shaft mounting surfaces is fixedly connected to the movable rod 12, and the other is fixedly connected to the handle rotation connector 14. The handle rotation connector 14 is rotatably connected to the handle shaft, and one end of the handle shaft is fixed to the box body 1, and the other end is fixed to the left side of the side support frame 2.

[0030] The shift shaft 10 is provided with a first torsion spring 15, which includes a right elastic portion, a left elastic portion, and a handle reset portion that abuts against the shift handle 9. The right elastic portion and the left elastic portion are located on both sides of the handle rotation connector 14, and the lower ends of the right elastic portion and the left elastic portion are fixedly connected to the left side of the side support frame 2. The handle reset portion connects the right elastic portion and the left elastic portion, and includes a reset beam that abuts against the handle rotation connector 14. When the shift handle 9 swings to the rear, the first torsion spring 15 is compressed by pushing the reset beam. When the shift handle 9 is released, the first torsion spring 15 pushes the shift handle 9 forward through the reset beam to achieve reset. The handle rotation connector 14 includes a handle rotation connection hole, the inner diameter of which is larger than the outer diameter of the handle shaft, and a filler made of a flexible material is provided between the handle rotation connection hole and the handle shaft. The filler can be made of rubber or other materials with certain flexibility and elasticity. The filler can ensure that the shift handle 9 can swing in the lateral direction while being connected to the handle shaft. When the shift handle 9 swings in the lateral direction, the filler is squeezed. An adjusting member for adjusting the length is also installed between the handle rotation connection portion and the shaft mounting seat 13, so that the size can be adaptively adjusted during the installation process.

[0031] The shift lever 8 includes a length adjustment rod and connectors installed at both ends of the length adjustment rod, and an adjustment nut is installed at the connection between the connector and the length adjustment rod. The length adjustment rod can make the length of the shift lever 8 adjustable, so that the installation process will not be difficult due to dimensional accuracy or there will be a large stress after installation.

[0032] The speed change assembly in the housing 1 includes a speed change shaft 16, on which an advance gear wheel 17 and a reverse gear wheel 18 are mounted, and a shift wheel 19 is arranged between the advance gear wheel 17 and the reverse gear wheel 18. The housing 1 is also provided with a control shaft for controlling the shift wheel 19 to move in the axial direction of the speed change shaft 16, and the control shaft is connected to the shift rod 8. An annular groove is arranged in the circumferential direction of the shift wheel 19, and a control claw 20 is mounted on the control shaft, and the control claw 20 includes two claw heads located in the annular groove. The shift wheel 19 is provided with an advance gear transmission block on the side facing the advance gear wheel 17, and the shift wheel 19 is provided with a reverse gear transmission block on the side facing the reverse gear wheel 18. The advance gear wheel 17 is provided with an advance gear slot adapted to the advance gear transmission block, and the reverse gear wheel 18 is provided with a reverse gear slot adapted to the reverse gear transmission block.

[0033] The speed change shaft 16 is provided with a transmission part and a non-transmission part. The advance gear wheel 17 and the reverse gear wheel 18 are circumferentially movably mounted on the non-transmission part of the speed change shaft 16, that is, there is no direct circumferential limit between the advance gear wheel 17 and the reverse gear wheel 18, and the advance gear wheel 17 and the reverse gear wheel 18 can be connected to the speed change shaft 16 through a bushing or a bearing. The shift wheel 19 is mounted on the transmission part of the speed change shaft 16, and due to the transmission of the transmission part, the shift wheel 19 rotates synchronously with the speed change shaft 16. When the advance gear transmission block of the shift wheel 19 is engaged with the advance gear slot on the advance gear wheel 17, the shift wheel 19 drives the advance gear wheel 17 to rotate, and at this time, the advance gear wheel 17 also rotates synchronously with the speed change shaft 16. When the reverse gear transmission block of the shift wheel 19 is engaged with the reverse gear slot of the reverse gear wheel 18, the shift wheel 19 drives the reverse gear wheel 18 to rotate, and at this time, the reverse gear wheel 18 rotates synchronously with the speed change shaft 16. When the forward gear transmission block and the reverse gear transmission block of the shift wheel 19 are not engaged, the forward gear wheel 17 and the reverse gear wheel 18 will not rotate with the speed change shaft 16. Whether the shift wheel 19 is engaged is controlled by the control claw 20. When the control shaft rotates, the control claw 20 is driven to swing, and the swing of the control claw 20 can drive the shift wheel 19 to move in the axial direction of the speed change shaft 16. When the shift wheel 19 moves axially close to the forward gear wheel 17, the forward gear transmission block is engaged with the forward gear slot. When the shift wheel 19 moves axially close to the reverse gear wheel 18, the reverse gear transmission block is engaged with the reverse gear slot. When the shift wheel 19 is axially located in the middle position between the forward gear wheel 17 and the reverse gear wheel 18, the shift wheel 19 is not engaged. When the shift wheel 19 moves axially on the speed change shaft 16, it is always located on the transmission part.

[0034] When the snowmobile is in the parking state, the shift handle 9 is located in the parking opening 5, and the shift wheel 19 is located in the middle of the forward gear wheel 17 and the reverse gear wheel 18, and is not in the meshing state. Therefore, the rotation of the speed change shaft 16 will not be transmitted to the forward gear wheel 17 or the reverse gear wheel 18. When the snowmobile needs to be started forward, the driver holds the grip head 11 of the shift handle 9 with his hand, first pushes the shift handle 9 backward from the parking opening 5 into the shift channel 4, and then shakes the shift handle 9 to the right. When the shift handle 9 moves to the right end of the shift channel 4, it cannot continue to move to the right. At this time, the shift handle 9 is shaken to the front side to enter the forward gear opening 6. After the shift handle 9 moves to the right, driven by the shift lever 8, the control shaft rotates, so that the shift wheel 19 meshes with the forward gear wheel 17, and the speed change shaft 16 indirectly drives the forward gear wheel 17 to rotate, thereby realizing the forward movement of the snowmobile. If the driver releases the shift handle 9 in advance after the shift handle 9 moves to the shift channel 4, the shift handle 9 will automatically swing forward under the action of the first torsion spring 15, thereby entering the gear entry port 6 and completing the shift action, which ensures the reliability of the shift action and reduces the situation where the shift fails due to the driver's inadequate action. If the driver touches the shift handle 9 by mistake, causing the shift handle 9 to move forward or backward, the shift handle 9 will also automatically swing forward under the action of the first torsion spring 15, so that the shift handle 9 automatically resets and no shift occurs. Similarly, when the snowmobile needs to reverse, the driver holds the grip head 11 of the shift handle 9 with his hand, first pushes the shift handle 9 backward from the parking port 5 into the shift channel 4, and then shakes the shift handle 9 to the left. When the shift handle 9 moves to the left end of the shift channel 4, it cannot continue to move to the left. At this time, the shift handle 9 is shaken forward to enter the reverse gear port 7. After the shift handle 9 moves to the left, the shift lever 8 drives the control shaft to rotate, so that the shift wheel 19 is engaged with the reverse wheel 18, and the speed change shaft 16 indirectly drives the reverse wheel 18 to rotate, thereby realizing the reverse of the snowmobile. In the present application, the diameter of the forward gear wheel 17 is larger than the reverse gear wheel 18, which also makes the speed of the snowmobile relatively slow when reversing, ensuring the safety of reversing.

[0035] like Figure 1-3 In the second embodiment shown in FIG. 5 , a snowmobile shift structure includes a housing 1 , a speed change assembly is installed inside the housing 1 , and a shift bracket and a shift assembly are installed outside the housing 1 .

[0036] The shift bracket includes a side support frame 2 and an upper frame 3. The side support frame 2 includes a right side, a left side and a rear side. The right side and the left side are connected by the rear side. The right side, the left side and the rear side are all provided with weight-reducing holes for reducing weight, thereby reducing the overall weight. The right side and the left side are both fixedly mounted on the box body 1. The upper frame 3 includes a rear mounting plate and an upper functional plate. The rear mounting plate is fixedly connected to the rear side of the side support frame 2.

[0037] The upper functional panel is provided with a shift limit opening. The shift limit opening is in the shape of the letter E, and includes a shift channel 4 arranged transversely, a parking opening 5 is connected at the midpoint of the shift channel 4, the parking opening 5 intersects with the shift channel 4, and a gear entry opening 6 and a reverse gear opening 7 are respectively provided on both sides of the parking opening 5, the gear entry opening 6 and the reverse gear opening 7 both intersect with and communicate with the shift channel 4, and the gear entry opening 6 and the reverse gear opening 7 are respectively connected at both ends of the shift channel 4. The length directions of the gear entry opening 6 and the reverse gear opening 7 are both perpendicular to the direction of the shift channel 4, that is, the directions of the gear entry opening 6 and the reverse gear opening 7 are both located in the front and rear directions of the vehicle.

[0038] The shift assembly includes a shift rod 8 and a shift handle 9. The shift handle 9 is rotatably connected to the housing 1 via a handle shaft, a shift shaft 10 perpendicular to the handle shaft is fixedly mounted on the shift handle 9, and the shift rod 8 is rotatably connected to the shift shaft 10.

[0039] The shift handle 9 includes a grip head 11, a movable rod 12, a shaft mounting seat 13, and a handle rotating connector 14 from top to bottom. The size and shape of the grip head 11 conform to the ergonomic design, which is convenient for the operator to hold with his hand. The movable rod 12 passes through the shift limit opening. The movable rod 12 is a crank structure. The width of the movable rod 12 is directly adapted to the parking opening 5, the gear entry opening 6, and the reverse gear opening 7 of the shift limit opening. When the movable rod 12 is located in the parking opening 5, the gear entry opening 6 or the reverse gear opening 7, the entire shift handle 9 is limited and can only move in the direction of exiting the above-mentioned bayonet, and will not shake in multiple directions. The movement of the shift handle 9 in the direction of exiting the bayonet will not drive the shifting process. This part of the structure also reflects the effect that the shifting of the present application is not easy to be accidentally touched.

[0040] The shift handle 9 includes a shaft mounting seat 13 located in the middle thereof, and the shift shaft 10 is mounted on the shaft mounting seat 13. The shaft mounting seat 13 is in the shape of a square frame, and includes two opposite shaft mounting surfaces and two opposite connection mounting surfaces. The shift shaft 10 passes through the two shaft mounting surfaces, and one end of the shift rod 8 is located between the two shaft mounting surfaces and is rotatably connected to the shift shaft 10. One of the two shaft mounting surfaces is fixedly connected to the movable rod 12, and the other is fixedly connected to the handle rotation connector 14. The handle rotation connector 14 is rotatably connected to the handle shaft, and one end of the handle shaft is fixed to the box body 1, and the other end is fixed to the left side of the side support frame 2.

[0041] The shift shaft 10 is provided with a first torsion spring 15, which includes a right elastic portion, a left elastic portion, and a handle reset portion that abuts against the shift handle 9. The right elastic portion and the left elastic portion are located on both sides of the handle rotation connector 14, and the lower ends of the right elastic portion and the left elastic portion are fixedly connected to the left side of the side support frame 2. The handle reset portion connects the right elastic portion and the left elastic portion, and includes a reset beam that abuts against the handle rotation connector 14. When the shift handle 9 swings to the rear, the first torsion spring 15 is compressed by pushing the reset beam. When the shift handle 9 is released, the first torsion spring 15 pushes the shift handle 9 forward through the reset beam to achieve reset. The handle rotation connector 14 includes a handle rotation connection hole, the inner diameter of which is larger than the outer diameter of the handle shaft, and a filler made of a flexible material is provided between the handle rotation connection hole and the handle shaft. The filler can be made of rubber or other materials with certain flexibility and elasticity. The filler can ensure that the shift handle 9 can swing in the lateral direction while being connected to the handle shaft. When the shift handle 9 swings in the lateral direction, the filler is squeezed. An adjusting member for adjusting the length is also installed between the handle rotation connection portion and the shaft mounting seat 13, so that the size can be adaptively adjusted during the installation process.

[0042] The shift lever 8 includes a length adjustment rod and connectors installed at both ends of the length adjustment rod, and an adjustment nut is installed at the connection between the connector and the length adjustment rod. The length adjustment rod can make the length of the shift lever 8 adjustable, so that the installation process will not be difficult due to dimensional accuracy or there will be a large stress after installation.

[0043] The speed change assembly in the housing 1 includes a speed change shaft 16, on which an advance gear wheel 17 and a reverse gear wheel 18 are mounted, and a shift wheel 19 is arranged between the advance gear wheel 17 and the reverse gear wheel 18. The housing 1 is also provided with a control shaft for controlling the shift wheel 19 to move in the axial direction of the speed change shaft 16, and the control shaft is connected to the shift rod 8. An annular groove is arranged in the circumferential direction of the control wheel, and a control claw 20 is mounted on the control shaft, and the control claw 20 includes two claw heads located in the annular groove. The shift wheel 19 is provided with an advance gear transmission block on the side facing the advance gear wheel 17, and a reverse gear transmission block on the side facing the reverse gear wheel 18. The advance gear wheel 17 is provided with an advance gear slot adapted to the advance gear transmission block, and the reverse gear wheel 18 is provided with a reverse gear slot adapted to the reverse gear transmission block.

[0044] The speed change shaft 16 is provided with a transmission part and a non-transmission part. The advance gear wheel 17 and the reverse gear wheel 18 are circumferentially movably mounted on the non-transmission part of the speed change shaft 16, that is, there is no direct circumferential limit between the advance gear wheel 17 and the reverse gear wheel 18, and the advance gear wheel 17 and the reverse gear wheel 18 can be connected to the speed change shaft 16 through a bushing or a bearing. The shift wheel 19 is mounted on the transmission part of the speed change shaft 16, and due to the transmission of the transmission part, the shift wheel 19 rotates synchronously with the speed change shaft 16. When the advance gear transmission block of the shift wheel 19 is engaged with the advance gear slot on the advance gear wheel 17, the shift wheel 19 drives the advance gear wheel 17 to rotate, and at this time, the advance gear wheel 17 also rotates synchronously with the speed change shaft 16. When the reverse gear transmission block of the shift wheel 19 is engaged with the reverse gear slot of the reverse gear wheel 18, the shift wheel 19 drives the reverse gear wheel 18 to rotate, and at this time, the reverse gear wheel 18 rotates synchronously with the speed change shaft 16. When the forward gear transmission block and the reverse gear transmission block of the shift wheel 19 are not engaged, the forward gear wheel 17 and the reverse gear wheel 18 will not rotate with the speed change shaft 16. Whether the shift wheel 19 is engaged is controlled by the control claw 20. When the control shaft rotates, the control claw 20 is driven to swing, and the swing of the control claw 20 can drive the shift wheel 19 to move in the axial direction of the speed change shaft 16. When the shift wheel 19 moves axially close to the forward gear wheel 17, the forward gear transmission block is engaged with the forward gear slot. When the shift wheel 19 moves axially close to the reverse gear wheel 18, the reverse gear transmission block is engaged with the reverse gear slot. When the shift wheel 19 is axially located in the middle position between the forward gear wheel 17 and the reverse gear wheel 18, the shift wheel 19 is not engaged. When the shift wheel 19 moves axially on the speed change shaft 16, it is always located on the transmission part.

[0045] The control shaft is connected to the shift lever 8 through a flexible connection seat 21, and the shift lever 8 is rotationally connected to the flexible connection seat 21. A transmission part is provided on one end of the control shaft, and a folding part is provided on the transmission part. A rotating bayonet adapted to the folding part is provided on the flexible connection seat 21, and a second torsion spring 22 is installed between the transmission part and the flexible connection seat 21. A first through slot is provided on the transmission part, and a second through slot is provided on the flexible connection seat 21. One end of the second torsion spring 22 passes through the first through slot and the second through slot at the same time, and the other end of the second torsion spring 22 is located outside the first through slot and the second through slot. Driven by the shift lever 8, the flexible connection seat 21 rotates relative to the transmission part with the folding part as the center. When relative rotation does not occur, the two ends of the second torsion spring 22 are in a close state, one end of the second torsion spring 22 is in contact with the transmission part and the flexible connection seat 21 at the same time, and the other end is located at the ends of the first through slot and the second through slot at the same time. When relative rotation occurs, the two ends of the second torsion spring 22 separate, thereby generating elastic deformation.

[0046] When the snowmobile is in the parking state, the shift handle 9 is located in the parking opening 5, and the shift wheel 19 is located in the middle of the forward gear wheel 17 and the reverse gear wheel 18, and is not in the meshing state. Therefore, the rotation of the speed change shaft 16 will not be transmitted to the forward gear wheel 17 or the reverse gear wheel 18. When the snowmobile needs to be started forward, the driver holds the grip head 11 of the shift handle 9 with his hand, first pushes the shift handle 9 backward from the parking opening 5 into the shift channel 4, and then shakes the shift handle 9 to the right. When the shift handle 9 moves to the right end of the shift channel 4, it cannot continue to move to the right. At this time, the shift handle 9 is shaken to the front side to enter the forward gear opening 6. After the shift handle 9 moves to the right, driven by the shift lever 8, the control shaft rotates, so that the shift wheel 19 meshes with the forward gear wheel 17, and the speed change shaft 16 indirectly drives the forward gear wheel 17 to rotate, thereby realizing the forward movement of the snowmobile. If the driver releases the shift handle 9 in advance after the shift handle 9 moves to the shift channel 4, the shift handle 9 will automatically swing forward under the action of the first torsion spring 15, thereby entering the gear entry port 6 and completing the shift action, which ensures the reliability of the shift action and reduces the situation where the shift fails due to the driver's inadequate action. If the driver touches the shift handle 9 by mistake, causing the shift handle 9 to move forward or backward, the shift handle 9 will also automatically swing forward under the action of the first torsion spring 15, so that the shift handle 9 automatically resets and no shift occurs. Similarly, when the snowmobile needs to reverse, the driver holds the grip head 11 of the shift handle 9 with his hand, first pushes the shift handle 9 backward from the parking port 5 into the shift channel 4, and then shakes the shift handle 9 to the left. When the shift handle 9 moves to the left end of the shift channel 4, it cannot continue to move to the left. At this time, the shift handle 9 is shaken forward to enter the reverse gear port 7. After the shift handle 9 moves to the left, the shift lever 8 drives the control shaft to rotate, so that the shift wheel 19 is engaged with the reverse wheel 18, and the speed change shaft 16 indirectly drives the reverse wheel 18 to rotate, thereby realizing the reverse of the snowmobile. In the present application, the diameter of the forward gear wheel 17 is larger than the reverse gear wheel 18, which also makes the speed of the snowmobile relatively slow when reversing, ensuring the safety of reversing.

Claims

1. A snowmobile shifting structure, characterized in that: It includes a box body, on which a shift bracket and a shift assembly are installed, the shift bracket is provided with a shift limit port, the shift limit port includes a shift channel, the shift channel is connected with a parking port, the parking port intersects with the shift channel, and both sides of the parking port are provided with a gear entry port and a reverse gear port, and the gear entry port and the reverse gear port both intersect with and are connected to the shift channel.

2. According to the snowmobile shift structure described in claim 1, the shift assembly includes a shift rod and a shift handle, the shift handle is rotatably connected to the housing through a handle shaft, a shift shaft perpendicular to the handle shaft is fixedly mounted on the shift handle, and the shift rod is rotatably connected to the shift shaft.

3. According to a snowmobile shifting structure as described in claim 2, the shift handle includes a shaft mounting seat located in the middle thereof, the shift shaft is mounted on the shaft mounting seat, the shaft mounting seat includes two shaft mounting surfaces, the shift shaft passes through the two shaft mounting surfaces, and one end of the shift rod is located between the two shaft mounting surfaces.

4. A snowmobile shift structure according to claim 2, wherein a first torsion spring is installed on the shift shaft, and the first torsion spring includes a handle reset portion that abuts against the shift handle.

5. A snowmobile shift structure according to any one of claims 2 to 4, wherein the shift lever comprises a length adjustment rod and connectors installed at both ends of the length adjustment rod, and an adjustment nut is installed at the connection between the connector and the length adjustment rod.

6. A snowmobile shifting structure according to claim 1, a speed change shaft is installed in the housing, an advance gear wheel and a reverse gear wheel are installed on the speed change shaft, a shift wheel is arranged between the advance gear wheel and the reverse gear wheel, and a control shaft for controlling the shift wheel to move in the axial direction of the speed change shaft is also installed on the housing, and the control shaft is connected to the shift lever.

7. A snowmobile shift structure according to claim 6, wherein the control shaft and the shift lever are connected via a flexible connection seat, and the shift lever is rotationally connected to the flexible connection seat.

8. According to the snowmobile shifting structure of claim 7, a transmission part is provided on one end of the control shaft, a folding part is provided on the transmission part, a rotating bayonet adapted to the folding part is provided on the flexible connection seat, and a second torsion spring is installed between the transmission part and the flexible connection seat.

9. A snowmobile shifting structure according to claim 6, wherein the shifting wheel is provided with an annular groove in the circumferential direction, a control claw is mounted on the control shaft, and the control claw includes two claw heads located in the annular groove.

10. A snowmobile shifting structure according to claim 6, wherein the shift wheel is provided with an advance gear transmission block on the side facing the advance gear wheel, and the shift wheel is provided with a reverse gear transmission block on the side facing the reverse gear wheel, the advance gear wheel is provided with an advance gear slot matched with the advance gear transmission block, and the reverse gear wheel is provided with a reverse gear slot matched with the reverse gear transmission block.

Images