Motorcycle rear shock

Abstract

This invention provides a rear shock absorber for motorcycles, comprising an oil reservoir sleeve, a piston rod slidably disposed at the top of the oil reservoir sleeve, and a piston valve slidably disposed inside the oil reservoir sleeve. The piston rod and piston valve are fixedly connected. A bottom connecting seat is provided at the bottom of the oil reservoir sleeve, and a top connecting seat is provided at the top of the piston rod. An external thread is provided on the outer wall of the bottom of the oil reservoir sleeve. An adjusting sleeve is fitted on the outer side of the oil reservoir sleeve, and an internal thread is provided on the inner wall of the adjusting sleeve. The internal thread and the external thread are screwed together for fixation. A connecting flange is provided on the outer wall of the top connecting seat. A shock-absorbing spring is fitted on the outer sides of the oil reservoir sleeve and the piston rod. The two ends of the shock-absorbing spring abut against the adjusting sleeve and the connecting flange, respectively. Clockwise rotation of the adjusting sleeve compresses the shock-absorbing spring through the connecting flange. After being compressed, the shock-absorbing spring provides a larger initial elastic force, which can provide more effective cushioning and shock absorption, thereby improving riding comfort.

Description

Technical Field

[0001] This invention relates to motorcycle accessories, and more particularly to a motorcycle rear shock absorber. Background Technology

[0002] Currently, Chinese patent CN211667080U discloses a shock absorber, including a base and a hydraulic cylinder mounted on the base. An inner cylinder is coaxially arranged inside the hydraulic cylinder and mounted on the base via a connecting seat. A sealing cap is tightly fitted between the upper end of the hydraulic cylinder and the inner cylinder. A piston rod is disposed inside the inner cylinder, with its upper end passing through the sealing cap and extending to the outside of the hydraulic cylinder, where a mounting seat is provided. The lower end of the piston rod is located inside the inner cylinder and connected to a piston. Two protrusions are evenly distributed around the outer surface of the hydraulic cylinder. A support sleeve is fitted onto the hydraulic cylinder, with a groove at the lower end of the support sleeve corresponding to the protrusions. The protrusions are embedded in the groove. A spring is disposed on the hydraulic cylinder between the support sleeve and the mounting seat.

[0003] During the compression stroke, the damper's damping force is relatively small, allowing the spring's elasticity to be fully utilized, thus mitigating impact and playing a primary role in shock absorption. During the extension stroke, the damper's damping force is large, providing rapid shock absorption.

[0004] However, as the shock absorbers are used for longer periods, the spring force will gradually weaken. This can lead to excessive compression stroke during the compression phase, affecting driving comfort. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a rear shock absorber for motorcycles that has the advantage of being able to adjust the spring force, thereby ensuring driving comfort.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a motorcycle rear shock absorber, comprising an oil reservoir sleeve, a piston rod slidably disposed at the top of the oil reservoir sleeve, and a piston valve slidably disposed inside the oil reservoir sleeve. The piston rod is fixedly connected to the piston valve. A bottom connecting seat is provided at the bottom of the oil reservoir sleeve, and a top connecting seat is provided at the top of the piston rod. An external thread is provided on the outer wall of the bottom of the oil reservoir sleeve. An adjusting sleeve is fitted on the outer side of the oil reservoir sleeve. An internal thread is provided on the inner wall of the adjusting sleeve. The internal thread and the external thread are screwed together and fixed. A connecting flange is provided on the outer wall of the top connecting seat. A shock-absorbing spring is fitted on the outer side of the oil reservoir sleeve and the piston rod. The two ends of the shock-absorbing spring respectively abut against the adjusting sleeve and the connecting flange.

[0007] With the above technical solution, when the spring force provided by the shock absorber is too small and cannot provide a more effective buffering and shock absorption effect, the adjusting sleeve is rotated clockwise to drive the adjusting sleeve to move upward. The adjusting sleeve compresses the shock absorber spring through the connecting flange. After the shock absorber spring is compressed, the initial spring force it can provide is larger, which can provide a more effective buffering and shock absorption effect, thereby improving driving comfort.

[0008] Preferably, the shock-absorbing spring is a pagoda-shaped spring, with the small end of the pagoda-shaped spring abutting against the connecting flange and the large end of the pagoda-shaped spring abutting against the adjusting sleeve.

[0009] Through the above technical solution, the pagoda-shaped spring has a relatively small thickness when fully compressed, allowing the shock absorber to have a larger compression stroke and extension stroke. The small end of the pagoda-shaped spring abuts against the connecting flange, and the large end of the pagoda-shaped spring abuts against the adjusting sleeve. This configuration of the pagoda-shaped spring provides better stability.

[0010] Preferably, the top connecting seat includes a bottom seat body sleeved on the piston rod and a top cover body threaded to the top of the piston rod. The outer diameter of the bottom seat body is smaller than the minimum inner diameter of the shock-absorbing spring, and the connecting flange is disposed on the outside of the top cover body.

[0011] With the above technical solution, the outer diameter of the bottom seat is smaller than the minimum inner diameter of the shock absorber spring. Therefore, when assembling the shock absorber, the shock absorber spring can be easily fitted onto the outside of the piston rod. The top cover is threaded to the piston rod, offering advantages such as stable connection and convenient assembly / disassembly.

[0012] Preferably, the top of the bottom seat has a storage groove one, and the bottom of the top cover has a storage groove two. A bearing is embedded between the storage groove one and the storage groove two, and the inner ring of the bearing holds the piston rod tightly.

[0013] By adding a bearing between the bottom seat and the top cover using the above technical solution, the wear of the bottom seat and the top cover can be reduced.

[0014] Preferably, a transmission assembly is provided at the bottom of the oil storage sleeve. The input end of the transmission assembly passes through the oil storage sleeve and extends into the inner cavity of the oil storage sleeve. The output end of the transmission assembly is connected to the adjusting sleeve. When the piston valve abuts against the input end of the transmission assembly, the transmission assembly drives the adjusting sleeve to rotate clockwise through the output end, causing the adjusting sleeve to move upward.

[0015] With the above technical solution, during riding, if the spring force provided by the shock absorber is insufficient, the downward sliding stroke of the piston rod increases. When the bottom of the piston rod contacts the input end of the transmission component, the piston rod will drive the adjusting sleeve to rotate clockwise through the transmission mechanism, causing the adjusting sleeve to move upward and compress the shock absorber spring. This eliminates the need for the user to manually rotate the adjusting sleeve, making the use of the shock absorber more convenient and quick.

[0016] Preferably, the transmission assembly includes an input mechanism and an output mechanism;

[0017] The input mechanism includes a sliding rod, a helical blade, and a return spring. The sliding rod is located on the outside of the oil storage sleeve. A needle is provided at the top of the sliding rod, which penetrates the oil storage sleeve and extends into the inner cavity of the oil storage sleeve. A connecting plate is provided in the middle of the sliding rod. The helical blade is located on the bottom outer wall of the sliding rod. The return spring is sleeved on the outside of the sliding rod, and its two ends are respectively connected to the oil storage sleeve and the connecting plate.

[0018] The output mechanism includes a rotating disk located below the oil storage sleeve and fixedly connected to the adjusting sleeve. A sliding hole is provided through the center of the rotating disk, and the sliding rod passes through the sliding hole. A spiral groove is provided on the inner wall of the sliding hole, and the spiral blade is slidably connected in the spiral groove.

[0019] With the above technical solution, when the bottom of the piston rod contacts the needle, the piston rod will drive the sliding rod and the helical blade to move downwards via the needle. During this downward movement, the helical blade will drive the rotating disk to rotate circumferentially through the helical groove. The rotating disk will then drive the adjusting sleeve to rotate clockwise, thereby compressing the damping spring and increasing the elastic force applied to the adjusting spring in its initial state. A needle is positioned at the top of the sliding rod and inserts into the adjusting sleeve. Due to the small surface area of ​​the needle, the damping medium flowing inside the adjusting sleeve is less likely to affect the operation of the transmission assembly. The return spring can further reduce the obstruction of the damping medium to the transmission assembly through its elastic force, allowing the transmission assembly to operate normally.

[0020] Preferably, the bottom of the oil storage sleeve is provided with an installation through hole, and a rubber seat is fixedly connected in the installation through hole, through which the needle passes.

[0021] Through the above technical solution, the rubber seat can wrap the needle, thereby improving the sealing performance of the shock absorber and making it difficult for the damping medium inside the oil reservoir sleeve to flow out.

[0022] Preferably, the inner wall of the mounting through hole is provided with an internal thread, the rubber seat includes a metal connecting sleeve and a rubber sealing inner core fixedly connected inside the metal connecting sleeve, the outer wall of the metal connecting sleeve is provided with an external thread, the external thread is screwed into and fixed with the internal thread, and the bottom of the metal connecting sleeve is provided with an inwardly tapered flange, the inwardly tapered flange abutting against the bottom of the rubber sealing inner core.

[0023] The above technical solution provides a high-strength metal connecting sleeve that can stably connect the rubber seat to the oil reservoir sleeve. The rubber sealing core tightly wraps around the needle, giving the shock absorber good sealing performance and excellent shock absorption.

[0024] Preferably, a sealing ring is fitted on the outer side of the metal connecting sleeve, and an outward flange is provided on the top of the metal connecting sleeve, the outward flange pressing the sealing ring against the bottom inner wall of the oil storage sleeve.

[0025] Through the above technical solution, the outer flange presses the sealing ring tightly against the bottom of the oil reservoir sleeve to seal the gap between the rubber seat and the oil reservoir sleeve, thereby further improving the sealing performance of the shock absorber.

[0026] Preferably, a guide groove is provided on the bottom inner wall of the adjusting sleeve, the guide groove is arranged along the axial direction of the adjusting sleeve, a guide block is provided on the outer wall of the rotating disk, the guide block is slidably connected in the guide groove, and a limit screw is provided on the outer side of the adjusting sleeve, the threaded section of the limit screw passes through the adjusting sleeve and is threadedly connected to the guide block.

[0027] Through the above technical solution, the guide groove and guide block cooperate to limit the relative rotation of the adjusting sleeve and the rotating disk, making the fixing process of the adjusting sleeve and the rotating disk more convenient and faster. The adjusting sleeve and the rotating disk are connected by limit screws, making the connection between them more stable. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0029] Figure 2 for Figure 1 Enlarged view of part A;

[0030] Figure 3 for Figure 1 Enlarged view of part B.

[0031] Reference numerals: 1. Oil reservoir sleeve; 2. Piston rod; 3. Piston valve; 4. Bottom connecting seat; 5. Top connecting seat; 51. Bottom seat body; 52. Top cover body; 6. Adjusting sleeve; 7. Connecting flange; 8. Shock-absorbing spring; 9. Storage slot one; 10. Storage slot two; 11. Bearing; 12. Transmission assembly; 121. Input mechanism; 1211. Sliding rod; 1212. Helical blade; 1213. Return spring; 122. Output mechanism; 1221. Rotating disk; 13. Needle; 14. Connecting plate; 15. Sliding hole; 16. Helical groove; 17. Mounting through hole; 18. Rubber seat; 181. Metal connecting outer sleeve; 182. Rubber sealing inner core; 19. Inward flange; 20. Sealing ring; 21. Outer flange; 22. Guide groove; 23. Guide block; 24. Limiting screw. Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered.

[0033] A type of motorcycle rear shock absorber, such as Figures 1 to 3 As shown, the device includes an oil reservoir sleeve 1, a piston rod 2 slidably disposed on the top of the oil reservoir sleeve 1, and a piston valve 3 slidably disposed inside the oil reservoir sleeve 1. The piston rod 2 and the piston valve 3 are fixedly connected. A bottom connecting seat 4 is provided at the bottom of the oil reservoir sleeve 1, and a top connecting seat 5 is provided at the top of the piston rod 2. In use, the piston rod 2 drives the piston valve 3 to slide inside the oil reservoir sleeve 1 to provide damping force, thereby achieving the purpose of shock absorption.

[0034] The bottom outer wall of the oil reservoir sleeve 1 is provided with external threads, and an adjusting sleeve 6 is fitted on the outer side of the oil reservoir sleeve 1. The inner wall of the adjusting sleeve 6 is provided with internal threads, which are screwed into and fixed with the external threads. A connecting flange 7 is provided on the outer wall of the top connecting seat 5. A shock-absorbing spring 8 is fitted on the outer side of the oil reservoir sleeve 1 and the piston rod 2. The shock-absorbing spring 8 is a pagoda-shaped spring, with the small end of the pagoda-shaped spring abutting against the connecting flange 7 and the large end of the pagoda-shaped spring abutting against the adjusting sleeve 6. The shock-absorbing spring 8 uses its elasticity to achieve the purpose of shock absorption, further improving the shock absorption effect of the above-mentioned shock absorber.

[0035] The top connecting seat 5 includes a bottom seat 51 sleeved on the piston rod 2 and a top cover 52 threaded to the top of the piston rod 2. The outer diameter of the bottom seat 51 is smaller than the minimum inner diameter of the shock-absorbing spring 8, and the connecting flange 7 is located on the outside of the top cover 52. A first storage groove 9 is opened on the top of the bottom seat 51, and a second storage groove 10 is opened on the bottom of the top cover 52. A bearing 11 is embedded between the first storage groove 9 and the second storage groove 10, and the inner ring of the bearing 11 grips the piston rod 2.

[0036] A transmission assembly 12 is provided at the bottom of the oil storage sleeve 1. The input end of the transmission assembly 12 passes through the oil storage sleeve 1 and extends into the inner cavity of the oil storage sleeve 1. The output end of the transmission assembly 12 is connected to the adjusting sleeve 6. When the piston valve 3 touches the input end of the transmission assembly 12, the transmission assembly 12 drives the adjusting sleeve 6 to rotate clockwise through the output end, causing the adjusting sleeve 6 to move upward.

[0037] The transmission assembly 12 includes an input mechanism 121 and an output mechanism 122. The input mechanism 121 includes a sliding rod 1211, a helical blade 1212, and a return spring 1213. The sliding rod 1211 is located on the outside of the oil storage sleeve 1. A needle 13 is provided at the top of the sliding rod 1211. The needle 13 penetrates the oil storage sleeve 1 and extends into the inner cavity of the oil storage sleeve 1. A connecting plate 14 is provided in the middle of the sliding rod 1211. The helical blade 1212 is provided on the bottom outer wall of the sliding rod 1211. The return spring 1213 is sleeved on the outside of the sliding rod 1211, and the two ends of the return spring 1213 are respectively connected to the oil storage sleeve 1 and the connecting plate 14. The output mechanism 122 includes a rotating disk 1221, which is located below the oil storage sleeve 1 and is fixedly connected to the adjusting sleeve 6. A sliding hole 15 is provided through the center of the rotating disk 1221, and a sliding rod 1211 passes through the sliding hole 15. A spiral groove 16 is provided on the inner wall of the sliding hole 15, and a spiral blade 1212 is slidably connected in the spiral groove 16. The bottom connecting seat 4 is rotatably connected to the bottom of the rotating disk 1221.

[0038] The bottom of the oil storage sleeve 1 has a mounting through hole 17, in which a rubber seat 18 is fixedly connected, and a needle 13 passes through the rubber seat 18. The inner wall of the mounting through hole 17 has an internal thread. The rubber seat 18 includes a metal connecting sleeve 181 and a rubber sealing core 182 fixedly connected inside the metal connecting sleeve 181. The outer wall of the metal connecting sleeve 181 has an external thread, which engages with the internal thread for fixation. The bottom of the metal connecting sleeve 181 has an inwardly tapered flange 19, which abuts against the bottom of the rubber sealing core 182. A sealing ring 20 is fitted onto the outer side of the metal connecting sleeve 181, and an outwardly tapered flange 21 is provided at the top of the metal connecting sleeve 181, pressing the sealing ring 20 against the bottom inner wall of the oil storage sleeve 1.

[0039] A guide groove 22 is provided on the bottom inner wall of the adjusting sleeve 6. The guide groove 22 is arranged along the axial direction of the adjusting sleeve 6. A guide block 23 is provided on the outer wall of the rotating disk 1221. The guide block 23 is slidably connected in the guide groove 22. A limit screw 24 is provided on the outer side of the adjusting sleeve 6. The threaded section of the limit screw 24 passes through the adjusting sleeve 6 and is threadedly connected to the guide block 23.

[0040] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A motorcycle rear shock absorber, comprising an oil reservoir sleeve (1), a piston rod (2) slidably disposed on the top of the oil reservoir sleeve (1), and a piston valve (3) slidably disposed inside the oil reservoir sleeve (1), wherein the piston rod (2) is fixedly connected to the piston valve (3), a bottom connecting seat (4) is provided at the bottom of the oil reservoir sleeve (1), and a top connecting seat (5) is provided at the top of the piston rod (2), characterized in that: The bottom outer wall of the oil storage sleeve (1) is provided with an external thread, and the outer side of the oil storage sleeve (1) is provided with an adjusting sleeve (6). The inner wall of the adjusting sleeve (6) is provided with an internal thread, and the internal thread is screwed into the external thread for fixation. The outer wall of the top connecting seat (5) is provided with a connecting flange (7). The outer side of the oil storage sleeve (1) and the piston rod (2) is provided with a shock-absorbing spring (8). The two ends of the shock-absorbing spring (8) respectively abut against the adjusting sleeve (6) and the connecting flange (7). A transmission assembly (12) is provided at the bottom of the oil storage sleeve (1). The input end of the transmission assembly (12) passes through the oil storage sleeve (1) and extends into the inner cavity of the oil storage sleeve (1). The output end of the transmission assembly (12) is connected to the adjusting sleeve (6). When the piston valve (3) abuts against the input end of the transmission assembly (12), the transmission assembly (12) drives the adjusting sleeve (6) to rotate clockwise through the output end, so that the adjusting sleeve (6) moves upward. The transmission assembly (12) includes an input mechanism (121) and an output mechanism (122); The input mechanism (121) includes a sliding rod (1211), a spiral blade (1212), and a return spring (1213). The sliding rod (1211) is located on the outside of the oil storage sleeve (1). A needle (13) is provided at the top of the sliding rod (1211). The needle (13) penetrates the oil storage sleeve (1) and extends into the inner cavity of the oil storage sleeve (1). A connecting plate (14) is provided in the middle of the sliding rod (1211). The spiral blade (1212) is provided at the bottom outer wall of the sliding rod (1211). The return spring (1213) is sleeved on the outside of the sliding rod (1211), and the two ends of the return spring (1213) are respectively connected to the oil storage sleeve (1) and the connecting plate (14). The output mechanism (122) includes a rotating disk (1221), which is located below the oil storage sleeve (1) and is fixedly connected to the adjusting sleeve (6). A sliding hole (15) is provided through the center of the rotating disk (1221), and the sliding rod (1211) passes through the sliding hole (15). A spiral groove (16) is provided on the inner wall of the sliding hole (15), and the spiral blade (1212) is slidably connected in the spiral groove (16).

2. The rear shock absorber for a motorcycle according to claim 1, characterized in that: The shock-absorbing spring (8) is a pagoda-shaped spring, and the small end of the pagoda-shaped spring abuts against the connecting flange (7), while the large end of the pagoda-shaped spring abuts against the adjusting sleeve (6).

3. A motorcycle rear shock absorber according to claim 2, characterized in that: The top connecting seat (5) includes a bottom seat (51) sleeved on the piston rod (2) and a top cover (52) threaded to the top of the piston rod (2). The outer diameter of the bottom seat (51) is smaller than the minimum inner diameter of the shock-absorbing spring (8). The connecting flange (7) is located on the outside of the top cover (52).

4. A motorcycle rear shock absorber according to claim 3, characterized in that: The bottom seat (51) has a storage groove 1 (9) at the top and a storage groove 2 (10) at the bottom of the top cover (52). A bearing (11) is embedded between the storage groove 1 (9) and the storage groove 2 (10), and the inner ring of the bearing (11) hugs the piston rod (2).

5. A motorcycle rear shock absorber according to claim 1, characterized in that: The bottom of the oil storage sleeve (1) is provided with an installation through hole (17), and a rubber seat (18) is fixedly connected in the installation through hole (17). The needle (13) passes through the rubber seat (18).

6. A motorcycle rear shock absorber according to claim 5, characterized in that: The inner wall of the mounting through hole (17) is provided with an internal thread. The rubber seat (18) includes a metal connecting sleeve (181) and a rubber sealing inner core (182) fixedly connected inside the metal connecting sleeve (181). The outer wall of the metal connecting sleeve (181) is provided with an external thread, which is screwed into the internal thread for fixation. The bottom of the metal connecting sleeve (181) is provided with an inwardly tapered flange (19), which abuts against the bottom of the rubber sealing inner core (182).

7. A motorcycle rear shock absorber according to claim 6, characterized in that: A sealing ring (20) is fitted on the outer side of the metal connecting sleeve (181), and an outward flange (21) is provided on the top of the metal connecting sleeve (181). The outward flange (21) presses the sealing ring (20) against the bottom inner wall of the oil storage sleeve (1).

8. A motorcycle rear shock absorber according to claim 1, characterized in that: The adjusting sleeve (6) has a guide groove (22) on its bottom inner wall. The guide groove (22) is arranged along the axial direction of the adjusting sleeve (6). The rotating disk (1221) has a guide block (23) on its outer wall. The guide block (23) is slidably connected in the guide groove (22). The adjusting sleeve (6) has a limit screw (24) on its outer side. The threaded section of the limit screw (24) passes through the adjusting sleeve (6) and is threadedly connected to the guide block (23).

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