Rear fork mechanism

Abstract

The invention discloses a rear fork mechanism which comprises a left rear fork seat and a right rear fork seat which are arranged on a motorcycle engine. The left rear fork seat and the right rear fork seat are respectively provided with a front shaft hole and a rear shaft hole, the middle of the left rear fork seat and the middle of the right rear fork seat are connected in a bilateral symmetry mode through a positioning piece so that the axes of the two front shaft holes in the left rear fork seat and the right rear fork seat can coincide, and the two rear shaft holes are used for being connected with a rear wheel assembly. The front shaft hole of the right rear fork seat is rotationally connected to an engine, the front shaft hole of the left rear fork seat is rotationally connected with an engine driving shaft, and a main chain wheel is arranged on the engine driving shaft and connected with a driven chain wheel through a chain. The main chain wheel, the left rear fork seat and the right rear fork seat form the same rotating center, so that the chain on the main chain wheel, the left rear fork seat and the right rear fork seat can synchronously move around the engine driving shaft, the situation that the chain on the main chain wheel and the chain on the driven chain wheel are loosened due to bumping in the driving process is avoided, and the driving safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycle components, in particular to a rear fork mechanism. Background Art

[0002] The motorcycle rear fork, also commonly known as the rear swing arm or rear flat fork, is an important part of the motorcycle suspension system. The motorcycle rear fork is mainly used to connect the rear wheel with the motorcycle body, frame, shock absorber and other parts. It plays the role of bearing the pressure of the motorcycle body, fixing the rear wheel and maintaining the stability of the motorcycle body. During the driving of the motorcycle, the rear fork can absorb and buffer the vibration caused by the road surface, improving the riding comfort and stability.

[0003] like Figure 1 As shown, the conventional rear fork 10' is welded together by metal parts 20', and the plastic part 30' is arranged on the metal parts 20' as decoration. Since the rear fork 10' is welded by multiple metal parts 20', there is internal stress in the cooling process after welding, which easily affects the process accuracy of the rear fork 10'.

[0004] In addition, if Figure 2 As shown, the conventional rear fork 10' relies on a dedicated rear fork fixing shaft 11' on the frame 40', so that the rear fork 10' can rotate slightly around the rear fork fixing shaft 11' during riding. The engine shaft 51' on the engine 50' for driving the rear wheel to rotate is independently arranged, and the engine shaft 51' is equipped with a main sprocket 61', and drives the slave sprocket 63' on the rear fork 10' through a chain 62'. However, although the chain 62' moves parallel to the rear fork 10' during riding, when encountering bumps, the rear fork 10' will rotate slightly around the rear fork fixed shaft 11', and the chain 62' will rotate slightly around the engine drive shaft 51', because the axis of the engine shaft 51' does not coincide with the axis of the rear fork fixed shaft 11'. The two cannot move synchronously, causing the chain to be loose and tight, which not only produces abnormal noise but also affects the transmission efficiency, posing certain safety hazards. In addition, the additional rear fork fixed shaft 11' not only occupies a large space, but also increases the assembly complexity of the rear fork 10'. Summary of the invention

[0005] The object of the present invention is to provide a rear fork mechanism, which can ensure the synchronous action of the rear fork and the chain during riding, thereby ensuring the safety of riding.

[0006] To achieve the above-mentioned purpose, the solution of the present invention is: a rear fork mechanism, including a left rear fork seat and a right rear fork seat arranged on a motorcycle engine; the left rear fork seat and the right rear fork seat are both provided with a front axle hole and a rear axle hole, the middle part of the left rear fork seat and the middle part of the right rear fork seat are symmetrically connected by a positioning piece so that the axes of the two front axle holes on the left rear fork seat and the right rear fork seat coincide, the two rear axle holes are used to connect the rear wheel assembly, the rear wheel assembly is provided with a slave sprocket, the front axle hole of the right rear fork seat is rotatably connected to the engine, the front axle hole of the left rear fork seat is rotatably connected to the engine, the front axle hole of the left rear fork seat is rotatably connected to the engine drive shaft, the engine drive shaft is provided with a main sprocket, and the main sprocket is connected to the slave sprocket through a chain.

[0007] In a preferred embodiment, the positioning member is a first positioning bushing and a positioning bolt, the left rear fork seat is provided with a left threaded through hole, the right rear fork seat is provided with a right threaded through hole, the left threaded through hole and the right threaded through hole are symmetrically arranged, the first positioning bushing is arranged in the left threaded through hole and the right threaded through hole, the positioning bolt passes through the positioning bushing and the left and right threaded through holes and is threadedly connected with the two threaded through holes to realize the locking positioning of the left rear fork seat and the right rear fork seat.

[0008] Preferably, the left threaded through hole is provided with a concave first step surface, the right threaded through hole is provided with a concave second step surface, one end of the first positioning bushing is embedded in the left threaded through hole and abuts against the first step surface, and the other end of the first positioning bushing is embedded in the right threaded through hole and abuts against the second step surface.

[0009] Preferably, the length of one end of the first positioning bushing embedded in the left threaded through hole and abutting against the first step surface is equal to the length of the other end of the first positioning bushing embedded in the right threaded through hole and abutting against the second step surface.

[0010] The preferred solution also includes a first bearing and a second bearing. A third step surface is convexly provided on the engine drive shaft on the left side of the engine, the first bearing is fixedly sleeved on the third step surface, and the front axle hole of the left rear fork seat is fixedly installed on the first bearing; a mounting groove is concavely provided on the right side of the engine, the second bearing is fixedly arranged at the bottom of the mounting groove, and the front axle hole of the right rear fork seat is installed on the second bearing through a fastener.

[0011] In a preferred embodiment, the fastener includes a first fastening bolt, a nut and a gasket. A fastening thread is provided on the front axle hole of the right rear fork seat. One end of the first fastening bolt is fixedly connected to the second bearing. The middle part of the first fastening bolt is fixedly connected to the front axle hole of the right rear fork seat by threaded cooperation. The gasket is sleeved on the other end of the first fastening bolt and abuts against the front axle hole of the right rear fork seat. The nut is fixedly sleeved on the other end of the first fastening bolt. The axis of the first fastening bolt coincides with the axis of the engine drive shaft.

[0012] The preferred solution further includes a second positioning sleeve and a sealing member, wherein the second positioning sleeve is sleeved on one end of the first fastening bolt and abuts against the second bearing, and the sealing member is sealingly disposed between the second positioning sleeve and the side wall of the mounting groove.

[0013] Preferably, the first bearing is a needle roller bearing, and the second bearing is a deep groove ball bearing.

[0014] The preferred solution further comprises a fixing cover, wherein the fixing cover and the main sprocket fixing sleeve are arranged at the left end of the engine drive shaft, and the fixing cover is used to cover the main sprocket.

[0015] The preferred embodiment also includes a second fastening bolt. A threaded blind hole is provided on the left side of the engine. The fixing cover and the left rear fork seat are provided with fastening through holes at positions matching the threaded blind hole. The second fastening bolt passes through the fastening through hole and cooperates with the threaded blind hole to lock the fixing cover and the left rear fork seat on the engine.

[0016] After adopting the above scheme, the beneficial effect of the present invention is that the middle part of the left rear fork seat and the middle part of the right rear fork seat of the present invention are symmetrically connected through the positioning piece so that the axes of the two front axle holes on the left rear fork seat and the right rear fork seat coincide, the two rear axle holes are used to connect the rear wheel assembly, the rear wheel assembly is provided with a slave sprocket, the front axle hole of the right rear fork seat is rotatably connected to the engine, the front axle hole of the left rear fork seat is rotatably connected to the engine drive shaft, the engine drive shaft is provided with a main sprocket, the main sprocket is connected to the slave sprocket through a chain, the structure is simple, the loading and unloading is convenient, and the space utilization rate is effectively improved. The main sprocket forms the same rotation center with the left rear fork seat and the right rear fork seat, so that the chain on the main sprocket and the left rear fork seat and the right rear fork seat can move synchronously around the engine drive shaft, avoiding the chain on the main sprocket and the slave sprocket from tightening and loosening due to bumps during driving, thereby improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an existing rear fork;

[0018] Figure 2 It is a side view of the existing rear fork installed on the frame;

[0019] Figure 3 It is an assembly schematic diagram of the middle part of the left rear fork seat and the middle part of the right rear fork seat of the present invention being connected symmetrically with each other through a positioning piece;

[0020] Figure 4 is a schematic diagram of arranging a first bearing on an engine drive shaft according to the present invention;

[0021] Figure 5 It is a schematic diagram of the assembly of the left rear fork seat and the right rear fork seat of the present invention installed on the engine;

[0022] Figure 6 It is a partial cross-sectional structural diagram of the right rear fork seat of the present invention installed on the right side of the engine;

[0023] Figure 7 It is a structural schematic diagram of the first fastening bolt of the present invention.

[0024] Description of labels:

[0025] 11. Left rear fork seat; 12. Right rear fork seat; 120. Right threaded through hole; 13. Front axle hole; 21. First positioning bushing; 22. Positioning bolt; 31. Engine; 32. Engine drive shaft; 33. Third step surface; 34. Mounting groove; 41. Main sprocket; 42. Slave sprocket; 43. Chain; 51. First bearing; 52. Second bearing; 6. Fastener; 61. First fastening bolt; 62. Nut; 63. Gasket; 64. Second positioning bushing; 65. Seal; 71. Fixing cover; 72. Second fastening bolt; 8. Rear wheel assembly. DETAILED DESCRIPTION

[0026] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0027] This embodiment provides a rear fork mechanism, such as Figures 3 to 7 As shown, it includes a left rear fork seat 11 and a right rear fork seat 12 arranged on a motorcycle engine 31; the left rear fork seat 11 and the right rear fork seat 12 are both provided with a front axle hole 13 and a rear axle hole, the middle part of the left rear fork seat 11 and the middle part of the right rear fork seat 12 are symmetrically connected to each other through a positioning piece so that the axes of the two front axle holes 13 on the left rear fork seat 11 and the right rear fork seat 12 coincide, and the two rear axle holes are used to connect the rear wheel assembly 8, and the rear wheel assembly 8 is provided with a slave sprocket 42, the front axle hole 13 of the right rear fork seat 12 is rotatably connected to the engine 31, the front axle hole 13 of the left rear fork seat 11 is rotatably connected to the engine drive shaft 32, the engine drive shaft 32 is provided with a main sprocket 41, and the main sprocket 41 is connected to the slave sprocket 42 through a chain 43.

[0028] The middle part of the left rear fork seat 11 and the middle part of the right rear fork seat 12 of this embodiment are symmetrically connected by a positioning piece, which can be accurately positioned during installation, thereby improving the convenience of installation, ensuring that the axes of the front axle holes 13 on both sides coincide, and improving the stability of the rear fork structure. At the same time, the left rear fork seat 11 and the right rear fork seat 12 of this embodiment are both made of aluminum material, and through one-piece molding processing, the left rear fork seat 11 and the right rear fork seat 12 can be used as both functional parts and appearance parts, with a simple structure and ingenious design, and can be applied to vehicles such as motorcycles or electric vehicles.

[0029] In this embodiment, the front axle hole 13 of the left rear fork 11 is rotatably connected to the engine drive shaft 32 on the left side of the engine 31, and the front axle hole 13 of the right rear fork 12 is rotatably connected to the right side of the engine 31. Since the axes of the two front axle holes 13 on the left rear fork 11 and the right rear fork 12 coincide, after the left rear fork 11 and the right rear fork 12 are installed on the engine 31, the axes of the left rear fork 11 and the right rear fork 12 also coincide with the axis of the engine drive shaft 32, thereby forming the same rotation center, and the engine drive shaft 32 is provided with a main sprocket 41, and the main sprocket 41 is connected to the slave sprocket 42 on the rear wheel assembly 8 through a chain 43. In this arrangement, the chain 43 on the main sprocket 41 and the left rear fork 11 and the right rear fork 12 can move synchronously around the engine drive shaft 32, avoiding the chain 43 on the main sprocket 41 and the slave sprocket 42 from tightening and loosening due to bumps during driving, thereby improving driving safety and having a simple structure.

[0030] like Figure 3 As shown, the positioning parts are a first positioning bushing 21 and a positioning bolt 22, the left rear fork seat 11 is provided with a left threaded through hole, and the right rear fork seat 12 is provided with a right threaded through hole 120, the left threaded through hole and the right threaded through hole 120 are symmetrically arranged, the first positioning bushing 21 is arranged in the left threaded through hole and the right threaded through hole 120, the positioning bolt 22 passes through the positioning bushing and the left and right threaded through holes and is threadedly connected with the two threaded through holes to realize the locking and positioning of the left rear fork seat 11 and the right rear fork seat 12.

[0031] In this embodiment, the positioning bolt 22 passes through the positioning bushing and is threadedly connected to the left and right threaded through holes, thereby achieving a tight connection between the left rear fork seat 11 and the right rear fork seat 12, ensuring the connection strength and stability, and improving the reliability and safety of use. The first positioning bushing 21 is arranged in the left threaded through hole and the right threaded through hole 120, and the structure is simple, making the connection between the left rear fork seat 11 and the right rear fork seat 12 more convenient, easy to load and unload, and conducive to later maintenance.

[0032] Furthermore, the left threaded through hole is provided with a concave first step surface, the right threaded through hole 120 is provided with a concave second step surface, one end of the first positioning bushing 21 is embedded in the left threaded through hole and abuts against the first step surface, and the other end of the first positioning bushing 21 is embedded in the right threaded through hole 120 and abuts against the second step surface.

[0033] In this embodiment, the first positioning bushing 21 is directly disposed on the first step surface of the left threaded through hole and the second step surface of the right threaded through hole 120 , which simplifies the installation and positioning process and improves convenience.

[0034] Furthermore, in this embodiment, the length of one end of the first positioning bushing 21 embedded in the left threaded through hole and resting on the first step surface is equal to the length of the other end of the first positioning bushing 21 embedded in the right threaded through hole 120 and resting on the second step surface, but not limited to this. It can ensure that the first positioning bushing 21 is evenly stressed in the left rear fork seat 11 and the right rear fork seat 12, so that the positioning of the left rear fork seat 11 and the right rear fork seat 12 during connection is more accurate and convenient.

[0035] like Figures 4 to 6 As shown, it also includes a first bearing 51 and a second bearing 52. A third step surface 33 is convexly provided on the engine drive shaft 32 on the left side of the engine 31. The first bearing 51 is fixedly sleeved on the third step surface 33. The front axle hole 13 of the left rear fork seat 11 is fixedly installed on the first bearing 51; a mounting groove 34 is concavely provided on the right side of the engine 31. The second bearing 52 is fixedly set at the bottom of the mounting groove 34. The front axle hole 13 of the right rear fork seat 12 is installed on the second bearing 52 through a fastener 6.

[0036] In this embodiment, a first bearing 51 and a second bearing 52 are provided, and the axes of the first bearing 51 and the second bearing 52 coincide with the axis of the engine drive shaft 32. The front axle hole 13 of the left rear fork seat 11 is installed on the first bearing 51, and the front axle hole 13 of the right rear fork seat 12 is installed on the second bearing 52. This ensures that when encountering bumps during driving, the left rear fork seat 11 and the right rear fork seat 12 can be slightly rotated around the axis of the engine drive shaft 32 through the first bearing 51 and the second bearing 52, that is, the left rear fork seat 11 and the right rear fork seat 12 have the same rotation center as the engine drive shaft 32, thereby ensuring driving safety.

[0037] like Figures 5 to 7 As shown, the fastener 6 includes a first fastening bolt 61, a nut 62 and a gasket 63. A fastening thread is provided on the front axle hole 13 of the right rear fork seat 12. One end of the first fastening bolt 61 is fixedly connected to the second bearing 52. The middle part of the first fastening bolt 61 is fixedly connected to the front axle hole 13 of the right rear fork seat 12 by threaded cooperation. The gasket 63 is sleeved on the other end of the first fastening bolt 61 and abuts against the front axle hole 13 of the right rear fork seat 12. The nut 62 is fixedly sleeved on the other end of the first fastening bolt 61. The axis of the first fastening bolt 61 coincides with the axis of the engine drive shaft 32.

[0038] In this embodiment, the first fastening bolt 61 is threadedly matched with the front axle hole 13 of the right rear fork seat 12, and the nut 62 and the washer 63 are used in combination to form a strong mechanical connection structure, which can withstand large axial and radial loads and ensure a stable connection between the right rear fork seat 12 and the engine 31. Such a configuration also facilitates the assembly and disassembly process and is conducive to later maintenance.

[0039] like Figure 6As shown, it also includes a second positioning bushing 64 and a sealing member 65 . The second positioning bushing 64 is sleeved on one end of the first fastening bolt 61 and abuts against the second bearing 52 . The sealing member 65 is sealingly disposed between the second positioning bushing 64 and the side wall of the mounting groove 34 .

[0040] The first fastening bolt 61 of this embodiment is in the shape of a coaxial cylinder. Figure 6 and Figure 7 As shown, the diameter of one end of the first fastening bolt 61 is smaller than the diameter of the other end of the first fastening bolt 61, and a step surface is formed in the middle of the first fastening bolt 61, one end of the second positioning bushing 64 abuts on the second bearing 52, and the other end of the second positioning bushing 64 abuts on the step surface in the middle of the first fastening bolt 61. The second positioning bushing 64 of this embodiment can improve the stability between the first fastening bolt 61 and the second bearing 52, and the seal 65 provided between the second positioning bushing 64 and the side wall of the mounting groove 34 effectively prevents external dust, moisture and other impurities from entering the bearing, thereby protecting the cleanliness and lubrication performance of the bearing and improving the service life. The seal 65 of this embodiment can be an oil seal, but is not limited to it. In other embodiments, seals 65 of other structures can also be used.

[0041] like Figures 4 to 6 As shown, the first bearing 51 is a needle bearing, and the second bearing 52 is a deep groove ball bearing. Since the front axle hole 13 of the left rear fork seat 11 is rotatably connected to the engine drive shaft 32, the first bearing 51 of this embodiment is a needle bearing, and the needle bearing bears a greater load per unit area, ensuring driving safety. The right rear fork seat 12 is rotatably set on the right side of the engine 31, and the second bearing 52 needs to be set in the concave mounting groove 34 on the right side of the engine 31. Therefore, in this embodiment, the second bearing 52 adopts a deep groove ball bearing, which is small in size and has a certain load-bearing capacity and a simple structure. Of course, in other embodiments, different bearings can also be selected according to actual conditions.

[0042] like Figure 4 As shown, it also includes a fixing cover 71 , and the fixing cover 71 and the main sprocket 41 are fixedly sleeved on the left end of the engine drive shaft 32 , and the fixing cover 71 is used to cover the main sprocket 41 .

[0043] The fixed cover 71 of this embodiment can effectively cover and protect the main sprocket 41, prevent it from being directly eroded by the external environment, increase the service life, and ensure driving safety. At the same time, the fixed cover 71 can also improve the coordination and aesthetics of the overall appearance.

[0044] like Figure 4As shown, it also includes a second fastening bolt 72. A threaded blind hole is opened on the left side of the engine 31. The fixing cover 71 and the left rear fork seat 11 are opened with fastening through holes at positions matching the threaded blind hole. The second fastening bolt 72 passes through the fastening through hole and cooperates with the threaded blind hole to lock and fix the fixing cover 71 and the left rear fork seat 11 on the engine 31.

[0045] The second fastening bolt 72 of this embodiment passes through the fastening through hole and cooperates with the threaded blind hole, thereby realizing a firm connection between the fixing cover 71 and the left rear fork seat 11 and the engine 31. It has a simple structure, is easy to load and unload, has high strength and stability, can withstand large loads and vibrations, and ensures the stability and safety of the motorcycle during driving.

[0046] The directional terms mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0047] The above description is only a preferred embodiment of the present invention and is not a limitation on the design of this case. Any equivalent changes made based on the design key of this case shall fall within the protection scope of this case.

Claims

1. A rear fork mechanism, characterized in that: It includes a left rear fork seat and a right rear fork seat arranged on a motorcycle engine; The left rear fork and the right rear fork are both provided with a front axle hole and a rear axle hole. The middle part of the left rear fork and the middle part of the right rear fork are symmetrically connected by a positioning piece so that the axes of the two front axle holes on the left rear fork and the right rear fork coincide. The two rear axle holes are used to connect the rear wheel assembly. The rear wheel assembly is provided with a slave sprocket. The front axle hole of the right rear fork is rotatably connected to the engine, and the front axle hole of the left rear fork is rotatably connected to the engine drive shaft. The engine drive shaft is provided with a main sprocket, and the main sprocket is connected to the slave sprocket through a chain.

2. A rear fork mechanism according to claim 1, characterized in that: The positioning member is a first positioning bushing and a positioning bolt. The left rear fork seat is provided with a left threaded through hole, and the right rear fork seat is provided with a right threaded through hole. The left threaded through hole and the right threaded through hole are symmetrically arranged. The first positioning bushing is arranged in the left threaded through hole and the right threaded through hole. The positioning bolt passes through the positioning bushing and the left and right threaded through holes and is threadedly connected with the two threaded through holes to realize the locking and positioning of the left rear fork seat and the right rear fork seat.

3. A rear fork mechanism according to claim 2, characterized in that: The left threaded through hole is provided with a concave first step surface, the right threaded through hole is provided with a concave second step surface, one end of the first positioning bushing is embedded in the left threaded through hole and abuts against the first step surface, and the other end of the first positioning bushing is embedded in the right threaded through hole and abuts against the second step surface.

4. A rear fork mechanism according to claim 3, characterized in that: The length of one end of the first positioning bushing embedded in the left threaded through hole and abutting against the first step surface is equal to the length of the other end of the first positioning bushing embedded in the right threaded through hole and abutting against the second step surface.

5. A rear fork mechanism according to claim 1, characterized in that: It also includes a first bearing and a second bearing. A third step surface is convexly provided on the engine drive shaft on the left side of the engine. The first bearing is fixedly sleeved on the third step surface, and the front axle hole of the left rear fork seat is fixedly installed on the first bearing; a mounting groove is concavely provided on the right side of the engine, and the second bearing is fixedly arranged at the bottom of the mounting groove, and the front axle hole of the right rear fork seat is installed on the second bearing through a fastener.

6. A rear fork mechanism according to claim 5, characterized in that: The fastener includes a first fastening bolt, a nut and a gasket. A fastening thread is opened on the front axle hole of the right rear fork seat. One end of the first fastening bolt is fixedly connected to the second bearing. The middle part of the first fastening bolt is fixedly connected to the front axle hole of the right rear fork seat by threaded cooperation. The gasket is sleeved on the other end of the first fastening bolt and abuts against the front axle hole of the right rear fork seat. The nut is fixedly sleeved on the other end of the first fastening bolt. The axis of the first fastening bolt coincides with the axis of the engine drive shaft.

7. A rear fork mechanism according to claim 6, characterized in that: It also includes a second positioning sleeve and a sealing member. The second positioning sleeve is sleeved on one end of the first fastening bolt and abuts against the second bearing. The sealing member is sealingly arranged between the second positioning sleeve and the side wall of the mounting groove.

8. A rear fork mechanism according to claim 5, characterized in that: The first bearing is a needle roller bearing, and the second bearing is a deep groove ball bearing.

9. A rear fork mechanism according to claim 1, characterized in that: It also includes a fixing cover, wherein the fixing cover and the main sprocket fixing sleeve are arranged at the left end of the engine driving shaft, and the fixing cover is used for covering the main sprocket.

10. A rear fork mechanism according to claim 9, characterized in that: It also includes a second fastening bolt. A threaded blind hole is opened on the left side of the engine. The fixing cover and the left rear fork seat are provided with fastening through holes at positions matching the threaded blind hole. The second fastening bolt passes through the fastening through hole and cooperates with the threaded blind hole to lock and fix the fixing cover and the left rear fork seat on the engine.

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