Anti-scratch motorcycle rear shock absorber

Abstract

The anti-scratching motorcycle rear shock absorber comprises a hydraulic cylinder, a spring, a front connecting base and a rear connecting base, the rear connecting base is installed at the tail end of the hydraulic cylinder, and the end of a piston rod is connected with the front connecting base; a first spring seat is screwed close to the tail end of the hydraulic cylinder body, a second spring seat is connected close to the end of the piston rod, and the spring is arranged between the two spring seats. An annular sleeving groove is formed in the front end of the hydraulic cylinder body, the sleeving groove is sleeved with an anti-scraping sleeve made of a plastic material, and the anti-scraping sleeve is fixed through a buckle structure; the buckle structure comprises an annular clamping block at one end of the anti-scraping sleeve and an annular clamping groove in the outer wall of the hydraulic cylinder body, the groove bottom of the clamping groove is in an arc shape, an inclined guide face is arranged on the side wall of the clamping block, and a U-shaped telescopic groove is formed in the clamping block. The peripheral wall of the anti-scraping sleeve is provided with an arc-shaped groove (with an arc-shaped bottom surface) and two side conical surfaces. According to the structure, the spring and the outer wall of the hydraulic cylinder are isolated through the anti-scraping sleeve, friction scratches and noise are reduced, reliable fixation is ensured through the buckle structure, the guiding performance is optimized through the arc-shaped grooves and the conical surfaces, and the durability of the shock absorber and riding comfort are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motorcycle shock absorption, and specifically relates to an anti-scratch motorcycle rear shock absorber, which is used to solve the problems of cylinder scratches and noise caused by friction between the spring and the outer wall of the hydraulic cylinder of the existing rear shock absorber. Background Art

[0002] When a motorcycle is in motion, the rear shock absorber must simultaneously bear the rider's weight and road impacts, with its spring buffering this impact through expansion and contraction. However, frequent friction between the inner wall of the spring's axial bore and the outer wall of the hydraulic cylinder can easily cause scratches on the surface of the hydraulic cylinder. This not only affects the aesthetics but also increases component wear. Furthermore, the noise generated by friction reduces riding comfort. While existing designs mitigate friction through optimized spring materials or surface treatments, they fail to fundamentally isolate the direct contact between the spring and the hydraulic cylinder, and the scratching and noise issues remain significant. Therefore, there is an urgent need for a rear shock absorber with an improved structure to reduce friction losses between the spring and the hydraulic cylinder. Utility Model Content

[0003] In order to solve the above problems, the purpose of the present utility model is to provide a scratch-resistant motorcycle rear shock absorber, which reduces friction loss and noise by isolating the direct contact between the spring and the outer wall of the hydraulic cylinder, and improves the durability of the shock absorber and riding comfort.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A motorcycle rear shock absorber for preventing scratches, comprising a hydraulic cylinder, a spring, a front connecting seat and a rear connecting seat; the rear connecting seat is installed at the tail end of the hydraulic cylinder, and the end of the piston rod of the hydraulic cylinder is connected to the front connecting seat; an annular first spring seat is screwed to a position near the tail end of the cylinder body of the hydraulic cylinder, and an annular second spring seat is connected to a position near the end of the piston rod of the hydraulic cylinder, and the spring is arranged between the first spring seat and the second spring seat; an annular sleeve groove is provided at the front end position of the cylinder body of the hydraulic cylinder, and the sleeve groove extends to the front end surface of the cylinder body of the hydraulic cylinder; an anti-scratch cover for preventing scratches is sleeved on the sleeve groove, and the anti-scratch cover is made of plastic; the anti-scratch cover is fixed on the sleeve groove by a buckle structure, and the buckle structure comprises:

[0006] An annular clamping block is formed by extending one end of the anti-scratch sleeve toward its central axis;

[0007] An annular clamping groove is provided on the outer wall of the hydraulic cylinder at a position corresponding to the sleeve groove, and the annular clamping groove is adapted to the annular clamping block;

[0008] The bottom of the annular groove is arc-shaped; the side wall of the annular block facing the insertion direction is configured as an inclined guide surface;

[0009] The annular clamping block is provided with expansion slots evenly distributed around the circumference, the expansion slots are U-shaped, and their openings extend to the end surface of the anti-scratch sleeve;

[0010] The peripheral wall of the anti-scratch cover is further provided with arc-shaped grooves uniformly distributed around the circumference. The arc-shaped grooves are provided along the length direction of the anti-scratch cover and the bottom surface thereof is arc-shaped. The telescopic grooves are provided on the arc-shaped grooves.

[0011] Both sides of the outer peripheral wall of the anti-scratch sleeve are tapered, which facilitates the guiding and sliding in of the spring.

[0012] Furthermore, the telescopic groove has a depth of 5-8 mm and a width of 5-7 mm, which is used to allow the annular clamping block to elastically contract inward during installation, making it easier for the anti-scratch sleeve to be inserted into the hydraulic cylinder body.

[0013] Furthermore, the anti-scratch cover has a thickness of 3 mm, ensuring its structural strength while maintaining its lightness.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. Isolate friction and reduce scratches: The anti-scratch sleeve is installed on the front end of the hydraulic cylinder body to isolate the spring from the outer wall of the hydraulic cylinder, avoiding the inner wall of the spring shaft hole directly rubbing against the surface of the hydraulic cylinder, thereby fundamentally preventing the generation of scratches on the cylinder body.

[0016] 2. Reduce noise: The plastic material and arc groove design of the anti-scratch cover reduce the friction coefficient between the spring and the anti-scratch cover, reduce friction noise, and improve riding comfort.

[0017] 3. Easy installation and reliable fixation: The annular clamping block, inclined guide surface and telescopic groove design in the buckle structure make it easy for the anti-scratch cover to be quickly inserted and elastically fixed; the arc-shaped bottom of the annular clamping groove cooperates with the inclined guide surface of the clamping block to enhance the fixation stability and prevent the anti-scratch cover from falling off.

[0018] 4. Optimized sliding guide: The conical outer walls on both sides of the anti-scratch sleeve can guide the spring to slide smoothly into the anti-scratch sleeve along the conical surface, reducing installation resistance and improving assembly efficiency.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of a specific embodiment of the present utility model;

[0021] Figure 2 A cross-sectional view of a specific embodiment of the present utility model;

[0022] Figure 3 for Figure 1 A magnified view of middle A;

[0023] Figure 4 for Figure 2 Magnified view of B.

[0024] Description of reference numerals:

[0025] 1-Hydraulic cylinder; 2-Spring; 3-Front connecting seat; 4-Rear connecting seat; 5-First spring seat; 6-Second spring seat; 7-Socket groove; 8-Anti-scratch sleeve; 9-Annular clamping block; 10-Annular clamping groove; 11-Inclined guide surface; 12-Telescopic slot; 13-Arc groove; 14-Conical surface. DETAILED DESCRIPTION

[0026] The present invention is described in detail below through examples, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0027] like Figure 1 — Figure 4 As shown, the anti-scratch motorcycle rear shock absorber of the present invention includes a hydraulic cylinder 1, a spring 2, a front connecting seat 3, and a rear connecting seat 4. The tail end of the hydraulic cylinder 1 is fixedly mounted to the rear connecting seat 4 (for connecting to the vehicle frame) by bolts or welding, and the end of the piston rod is connected to the front connecting seat 3 (for connecting to the wheel bracket) by threads or flanges.

[0028] A first annular spring seat 5 is screwed to the position of the cylinder body of the hydraulic cylinder 1 near the tail end (cooperating with the outer thread of the hydraulic cylinder through the internal thread), and a second annular spring seat 6 is screwed to the position of the piston rod near the end (front end). The spring 2 is arranged between the first spring seat 5 and the second spring seat 6 to realize the shock absorption and buffering function.

[0029] In order to solve the friction problem between the spring 2 and the outer wall of the hydraulic cylinder 1, an annular sleeve groove 7 is processed at the front end of the cylinder body of the hydraulic cylinder 1 (the side close to the front connecting seat 3). The sleeve groove extends to the front end surface of the hydraulic cylinder and is used to embed an anti-scratch sleeve 8.

[0030] Anti-scratch sleeve 8 is made of plastic (such as nylon or polyoxymethylene), with its outer wall loosely fitting within the inner wall of sleeve groove 7 and secured by a snap-fit ​​mechanism. This snap-fit ​​mechanism comprises an annular retaining block 9 extending from one end of anti-scratch sleeve 8 (the end closest to rear connector 4) toward its central axis. An annular retaining groove 10 is formed on the outer wall of hydraulic cylinder 1 at a position corresponding to sleeve groove 7, matching the shape of retaining block 9.

[0031] Specifically, the bottom of the annular groove 10 is arc-shaped (eg Figure 4), which fits in with the outer arc surface of the annular clamping block 9 to enhance the tightness of the clamping; the side wall of the annular clamping block 9 facing the insertion direction (i.e. the side where the spring 2 is located) is set as an inclined guide surface 11 (inclination angle 5°-15°), which facilitates the elastic contraction of the annular clamping block 9 outward during installation, so that the anti-scratch sleeve 8 can be smoothly inserted into the cylinder body of the hydraulic cylinder 1.

[0032] To further enhance installation flexibility, the annular clamping block 9 is provided with expansion slots 12 evenly distributed around the circumference (the "U"-shaped opening extends to the end face of the anti-scratch sleeve 8). The depth of the expansion slots 12 is 5-8 mm and the width is 5-7 mm. During installation, the clamping block 9 can be retracted inward through the expansion slots 12 to reduce insertion resistance. After installation is completed, the clamping block 9 returns to its original shape under the action of plastic elasticity and engages tightly with the clamping slot 10 to prevent the anti-scratch sleeve 8 from falling off.

[0033] In addition, the circumferentially uniformly distributed arc grooves 13 are provided on the peripheral wall of the anti-scratch sleeve 8 (extending along the length direction of the anti-scratch sleeve), the bottom surface of which is arc-shaped (matching the curvature of the outer surface of the spring 2), which can reduce the contact area and friction coefficient between the outer wall of the anti-scratch sleeve and the spring 2; the two sides of the outer peripheral wall of the anti-scratch sleeve 8 (the side where the spring 2 slides in) are set as conical surfaces 14 (inclination angle 10°-20°), guiding the spring 2 to slide smoothly into the anti-scratch sleeve 8 along the conical surface to avoid installation jamming.

[0034] The utility model realizes isolation of the spring 2 from the outer wall of the hydraulic cylinder 1 through the above structure, effectively reduces friction scratches and noise, and at the same time improves installation convenience and reliability through the optimized clip structure and guide design.

[0035] The following technical effects can be achieved by adopting the above technical solution:

[0036] 1. Isolate friction and reduce scratches: The anti-scratch sleeve is installed on the front end of the hydraulic cylinder body to isolate the spring from the outer wall of the hydraulic cylinder, avoiding the inner wall of the spring shaft hole directly rubbing against the surface of the hydraulic cylinder, thereby fundamentally preventing the generation of scratches on the cylinder body.

[0037] 2. Reduce noise: The plastic material and arc groove design of the anti-scratch cover reduce the friction coefficient between the spring and the anti-scratch cover, reduce friction noise, and improve riding comfort.

[0038] 3. Easy installation and reliable fixation: The annular clamping block, inclined guide surface and telescopic groove design in the buckle structure make it easy for the anti-scratch cover to be quickly inserted and elastically fixed; the arc-shaped bottom of the annular clamping groove cooperates with the inclined guide surface of the clamping block to enhance the fixation stability and prevent the anti-scratch cover from falling off.

[0039] 4. Optimized sliding guide: The conical outer walls on both sides of the anti-scratch sleeve can guide the spring to slide smoothly into the anti-scratch sleeve along the conical surface, reducing installation resistance and improving assembly efficiency.

Claims

1. A motorcycle rear shock absorber for preventing scratches, comprising a hydraulic cylinder (1), a spring (2), a front connecting seat (3) and a rear connecting seat (4); the rear end of the hydraulic cylinder (1) is mounted with the rear connecting seat (4), and the end of the piston rod of the hydraulic cylinder (1) is connected to the front connecting seat (3); a first annular spring seat (5) is screwed to a position near the rear end of the cylinder body of the hydraulic cylinder (1), a second annular spring seat (6) is connected to a position near the end of the piston rod of the hydraulic cylinder (1), and the spring (2) is arranged between the first spring seat (5) and the second spring seat (6); and it is characterized in that: An annular sleeve groove (7) is provided at the front end of the cylinder body of the hydraulic cylinder (1), and the sleeve groove (7) extends to the front end surface of the cylinder body of the hydraulic cylinder (1); an anti-scratch sleeve (8) for preventing scratches is sleeved on the sleeve groove (7), and the anti-scratch sleeve (8) is made of plastic; the anti-scratch sleeve (8) is sleeved on the sleeve groove (7) and fixed by a snap-fit ​​structure.

2. The anti-scratch motorcycle rear shock absorber according to claim 1, characterized in that: The buckle structure comprises: an annular clamping block (9) formed by extending one end of the anti-scratch sleeve (8) toward its central axis; an annular clamping groove (10) is provided on the outer wall of the hydraulic cylinder (1) at a position corresponding to the sleeve groove (7), and the annular clamping groove (10) is adapted to the annular clamping block (9); the bottom of the annular clamping groove (10) is arc-shaped; and the side wall of the annular clamping block (9) facing the insertion direction is provided as an inclined guide surface (11).

3. The anti-scratch motorcycle rear shock absorber according to claim 2, characterized in that: The annular clamping block (9) is provided with expansion slots (12) evenly distributed around the circumference. The expansion slots (12) are U-shaped, and their openings extend to the end surface of the anti-scratch sleeve (8).

4. The anti-scratch motorcycle rear shock absorber according to claim 3, characterized in that: The peripheral wall of the anti-scratch sleeve (8) is further provided with arcuate grooves (13) uniformly distributed around the circumference. The arcuate grooves (13) are arranged along the length direction of the anti-scratch sleeve (8) and their bottom surfaces are arcuate. The telescopic grooves (12) are arranged on the arcuate grooves (13).

5. The anti-scratch motorcycle rear shock absorber according to claim 1 or 4, characterized in that: Both sides of the outer peripheral wall of the anti-scratch sleeve (8) are tapered surfaces (14).

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