Mounting structure for dust cover of shock absorber

Abstract

The invention provides a mounting structure for a dust cover of a shock absorber, aiming at solving the problem that a gap at the clamping part of the dust cover and a bearing of the shock absorber is easy to increase along with the increase of service time so as to reduce the abnormal sound of the shock absorber. The shock absorber dust cover installation structure comprises a shock absorber end cover and a bearing installed on a shock absorber installation base, the dust cover is in a corrugated pipe shape, and one end of the dust cover is arranged on the shock absorber end cover in a sleeving mode and connected with the shock absorber end cover in a clamped mode. One end of the dustproof cover is coaxially inserted into the bearing, the other end of the dustproof cover is coaxially inserted into the bearing, the inner wall of the bearing is provided with a protruding anti-falling barb which is clamped and matched with the dustproof cover, and the anti-falling barb is provided with a limiting surface which is matched with the outer wall of the dustproof cover so as to prevent the dustproof cover from moving in the direction of going deep into the bearing.

Description

Technical Field

[0001] This invention relates to the field of dust cover technology, specifically a dust cover installation structure for a vibration damper. Background Technology

[0002] A shock absorber dust cover, typically corrugated and also called a dust cover or protective cover, is a seemingly simple yet crucial component of an automotive shock absorber. Its core function is to protect the shock absorber's core components—the piston rod and oil seal—from external contamination and physical damage. The traditional installation method for shock absorber dust covers is as follows: one end of the dust cover is fitted onto the outside of the shock absorber bearing and snapped into place, while the other end is fitted onto the outside of the shock absorber's end cap and snapped into place. For example, publication number CN104373499A discloses a novel integrated dust cover for shock absorbers; publication number CN208107051U discloses a dust cover and a shock absorber assembly incorporating the dust cover.

[0003] Traditionally installed dust covers for vibration dampers are compressed along with the damper springs during use. The applicant discovered that, with prolonged use, the gap between the dust cover and the bearing widens, leading to abnormal noise. Research revealed that this is because, during the compression of the dust cover towards the bearing end, its end is subjected to a force that causes it to expand and deform outwards. Over time, the dust cover's resilience weakens, resulting in a larger gap between the dust cover and the bearing, causing loosening and abnormal noise. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dust cover installation structure for a shock absorber, so as to solve the problem that the gap between the dust cover and the shock absorber bearing tends to increase with the increase of the service time, thereby reducing abnormal noise from the shock absorber.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a shock absorber dust cover installation structure, including a shock absorber end cover and a bearing installed on a shock absorber mounting base. The dust cover is in the shape of a corrugated tube, and one end of the dust cover is sleeved on the shock absorber end cover and snapped into the shock absorber end cover.

[0006] The other end of the dust cover is coaxially inserted into the bearing. The inner wall of the bearing is provided with a protruding anti-detachment hook that engages with the dust cover. The anti-detachment hook is provided with a limiting surface that engages with the outer wall of the dust cover to prevent the dust cover from moving deeper into the bearing.

[0007] Furthermore, the limiting surface is inclined relative to the axis of the bearing, and along the direction from the bearing to the damper end cover, the limiting surface gradually moves away from the axis of the bearing.

[0008] Furthermore, the dust cover mates with the limiting surface via a mating surface, and the mating surface and the limiting surface are inclined in the same direction.

[0009] Furthermore, the surface where the dust cover and the anti-detachment hook engage is the anti-detachment surface. The anti-detachment surface is inclined relative to the axis of the bearing, and along the direction from the bearing to the end cover of the shock absorber, the anti-detachment surface gradually moves away from the axis of the bearing.

[0010] Furthermore, the outer wall of the shock absorber end cover is provided with a boss, and the inner wall of the dust cover is provided with a groove. The dust cover is engaged with the shock absorber end cover by the groove and the boss.

[0011] Furthermore, the side of the boss away from the bearing abuts against the side of the groove away from the bearing, and the end face of the dust cover abuts against the flange of the damper end cover.

[0012] Furthermore, the dust cover has a pre-bent portion on the side wall between the boss and the flange of the shock absorber end cover.

[0013] Furthermore, the pre-bent portion is bent at an angle to the outside of the dust cover.

[0014] The beneficial effects of the present invention are as follows: The dust cover installation structure of the present invention, by coaxially inserting the other end of the dust cover into the bearing, will not cause a large wobbling gap between the dust cover and the bearing in the later stage, which can avoid abnormal noise between the dust cover and the bearing in the later stage, and can also make the fit between the dust cover and the bearing tighter during the compression process, and can also improve the dust protection effect of the dust cover. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 Enlarged view of point A;

[0017] Figure 3 yes Figure 1 Enlarged view of point B;

[0018] Figure 4 It is a half-section view of the dust cover;

[0019] Figure 5 yes Figure 4 Enlarged view of point C;

[0020] The figure shows: dust cover 1, bearing 2, shock absorber end cover 3, mating surface 12, anti-detachment surface 13, groove 14, pre-bending part 15, anti-detachment hook 21, limiting surface 22, and boss 31. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 , Figure 2 As shown, the dust cover mounting structure for the shock absorber of the present invention includes a shock absorber end cover 3 and a bearing 2 mounted on a shock absorber mounting base. The dust cover 1 is corrugated. One end of the dust cover 1 is sleeved on the shock absorber end cover 3 and snapped into place; the other end of the dust cover 1 is coaxially inserted into the bearing 2. The inner wall of the bearing 2 is provided with a protruding anti-disengagement hook 21 that snaps into the dust cover 1. The anti-disengagement hook 21 is provided with a limiting surface 22 that engages with the outer wall of the dust cover 1 to prevent the dust cover 1 from moving deeper into the bearing 2.

[0023] In the dust cover installation structure of the shock absorber of the present invention, the dust cover is still prevented from detaching from the bearing by anti-detachment barbs. The anti-detachment barbs 21 cooperate with the bearing through the limiting surface 22 to prevent the dust cover 1 from moving into the bearing 2.

[0024] During the vibration absorption and compression process of the shock absorber, the dust cover 1 is also compressed. In the traditional installation method where the dust cover 1 is fitted onto the outside of the bearing 2, as the dust cover 1 is used, its resilience weakens, leading to a widening gap between the dust cover and the bearing, resulting in abnormal noise. In this shock absorber dust cover installation structure, although the dust cover 1 still tends to deform outwards at the connection point with the bearing during compression, the other end of the dust cover 1 is coaxially inserted into the bearing 2. The two are secured by a protruding anti-disengagement hook 21 on the inner wall of the bearing 2. Therefore, the outer wall of the dust cover 1 is restricted by the inner wall of the bearing, and the gap between them not only does not increase but actually decreases, resulting in a better fit. This avoids abnormal noise between the dust cover and the bearing later on. In other words, the dust cover installation structure of this invention will not result in a large wobbling gap between the dust cover and the bearing in the later stages. In addition, by coaxially inserting the other end of the dust cover 1 into the bearing 2, the fit between the dust cover and the bearing 2 will be tighter during the compression process, which can also improve the dustproof effect of the dust cover.

[0025] The limiting surface 22 can extend along the radial direction of the bearing. For example... Figure 2As shown, in this embodiment of the invention, the limiting surface 22 is inclined relative to the axial direction of the bearing 2, and along the direction from the bearing 2 to the damper end cover 3, the limiting surface 22 gradually moves away from the axial direction of the bearing 2. That is, the limiting surface 22 is inclined relative to the axial direction of the bearing 2, and the end of the limiting surface closer to the bearing 3 is the end closer to the bearing axis, while the other end (the end closer to the damper end cover 3) is the end farther from the bearing axis. From one end of the limiting surface to the other end, the inclination angle of the limiting surface can remain constant or gradually increase, and the inclination angle is generally greater than 30°.

[0026] The limiting surface 22 has the aforementioned inclined structure, which makes the dust cover and the anti-detachment hook fit together on an inclined surface, thus better ensuring the tight fit between the dust cover and the anti-detachment hook (bearing) during the compression process of the dust cover.

[0027] like Figure 2 , Figure 4 and Figure 5 As shown, to improve the fit between the dust cover and the anti-detachment hook, the surface of the dust cover that mates with the limiting surface 22 is defined as the mating surface 12. The mating surface 12 and the limiting surface 22 are inclined in the same direction. Because the mating surface 12 and the limiting surface 22 are inclined in the same direction, their contact area is larger, resulting in better dust protection.

[0028] The surface where the dust cover 1 and the anti-detachment hook 21 engage is defined as the anti-detachment surface 13. The anti-detachment surface 13 engages with the anti-detachment hook 21 to prevent the dust cover 1 from detaching from the bearing. The direction of the anti-detachment surface 13 can be along the radial direction of the bearing or other directions. Preferably, in this invention, the anti-detachment surface 13 is also inclined relative to the axial direction of the bearing 2, and along the direction from the bearing 2 to the vibration damper end cover 3, the anti-detachment surface 13 gradually moves away from the axis of the bearing 2. That is, the anti-detachment surface 13 is also inclined relative to the axial direction of the bearing 2, and the end of the anti-detachment surface closer to the bearing is closer to the bearing axis, while the other end (the end closer to the vibration damper end cover) is farther from the bearing axis. From one end to the other, the angle of inclination of the anti-detachment surface can remain constant or gradually increase.

[0029] The anti-detachment surface adopts the inclined surface of the above structure. During the stretching process of the dust cover, the anti-detachment hook 21 will generate a deformation force through the anti-detachment surface 13 to expand the mating surface of the dust cover outward. This ensures that the mating surface can also cooperate well with the limiting surface 22 during the stretching process of the dust cover, avoiding gaps between the dust cover and the bearing and preventing abnormal noise.

[0030] like Figure 3As shown in the embodiment of the present invention, the outer wall of the shock absorber end cover 3 is provided with a boss 31, and the inner wall of the dust cover 1 is provided with a groove 14. The dust cover 1 is engaged with the shock absorber end cover 3 through the groove 14 and the boss 31.

[0031] Furthermore, the side of the boss 31 away from the bearing 2 abuts against the side of the groove 14 away from the bearing 2, and the end face of the dust cover 1 abuts against the flange of the damper end cover 3. This structure, through the boss 31 and the flange of the damper end cover 3, secures the dust cover material between the boss 31 and the flange, preventing the groove 14 from deforming and allowing for better fixation of the dust cover. This also prevents the dust cover from easily pulling off the damper end cover, resulting in a better seal and helping to prevent abnormal noise between the dust cover and the damper end cover 3.

[0032] In some embodiments, the boss 31 is disposed on the inner wall of the dust cover 1, and the groove is disposed on the outer wall of the shock absorber end cover 3.

[0033] It is understandable that, in order to achieve a mating fit between the side of the boss 31 away from the bearing 2 and the side of the groove 14 away from the bearing 2, and to achieve a mating fit between the end face of the dust cover 1 and the flange of the damper end cover 3, the length of the side wall of the dust cover 1 located between the boss 31 and the flange of the damper end cover should be greater than the distance between the boss 31 and the flange of the damper end cover 3 before assembly. To facilitate the assembly of the dust cover 1 and the damper end cover 3, such as... Figure 3 As shown, the dust cover 1 has a pre-bent portion 15 on its side wall between the boss 31 and the flange of the shock absorber end cover 3. After the pre-bent portion 15 is provided, the side wall of the dust cover 1 between the boss 31 and the flange of the shock absorber end cover can be bent and deformed from the pre-bent portion 15 to become shorter, thereby facilitating the insertion of this part of the side wall between the boss 31 and the flange of the shock absorber end cover.

[0034] The pre-bent portion 15 can be bent inwards or outwards from the dust cover. Preferably, in this invention, the pre-bent portion 15 is bent outwards from the dust cover. After the dust cover 1 is assembled, it will bend and deform at the pre-bent portion 15, which provides a certain elastic restoring force. The outward bending of the pre-bent portion 15 allows for better engagement between the groove 14 and the boss 31.

Claims

1. Dust cover mounting structure for a shock absorber, comprising a shock absorber end cap (3) and a bearing (2) mounted on a shock absorber mounting, said dust cover (1) being in the form of a bellows, characterised in that: The dust cover (1) is sleeved on the shock absorber end cover (3) at one end and is clamped with the shock absorber end cover (3); The other end of the dust cover (1) is coaxially inserted into the bearing (2), the inner wall of the bearing (2) is provided with a protruding anti-dropping hook (21) clamped with the dust cover (1), and the anti-dropping hook (21) is provided with a limiting surface (22) matched with the outer wall of the dust cover (1) to prevent the dust cover (1) from moving in the direction of deepening into the bearing (2).

2. The dust cover mounting structure for a shock absorber according to claim 1, characterized in that: The limiting surface (22) is inclined relative to the axis direction of the bearing (2), and gradually away from the axis of the bearing (2) in the direction from the bearing (2) to the shock absorber end cover (3).

3. The dust cover mounting structure for a shock absorber according to claim 2, characterized in that: The dust cover (1) is matched with the limiting surface (22) through a matching surface (12), and the matching surface (12) is consistent with the inclination direction of the limiting surface (22).

4. The damper dust cover mounting structure according to any one of claims 1 to 3, characterized in that: The anti-dropping surface (13) of the dust cover (1) is matched with the anti-dropping hook (21), and the anti-dropping surface (13) is inclined relative to the axis direction of the bearing (2), and gradually away from the axis of the bearing (2) in the direction from the bearing (2) to the shock absorber end cover (3).

5. The dust cover mounting structure for a shock absorber according to claim 1, characterized in that: The outer wall of the shock absorber end cover (3) is provided with a boss (31), the inner wall of the dust cover (1) is provided with a groove (14), and the dust cover (1) is matched with the boss (31) through the groove (14) to realize clamping with the shock absorber end cover (3).

6. The dust cover mounting structure for a shock absorber according to claim 5, characterized in that: The side surface of the boss (31) away from the bearing (2) is abutted and matched with the side surface of the groove (14) away from the bearing (2), and the end surface of the dust cover (1) is abutted and matched with the flange of the shock absorber end cover (3).

7. The dust cover mounting structure for a shock absorber according to claim 6, characterized in that: The side wall of the dust cover (1) between the boss (31) and the flange of the shock absorber end cover (3) is provided with a pre-bending part (15).

8. The dust cover mounting structure for a shock absorber according to claim 7, characterized in that: The pre-bending part (15) is inclined and bent to the outside of the dust cover (1).

Images