Shock absorber hardness adjusting mechanism

Abstract

The utility model discloses a shock absorber hardness adjusting mechanism which is arranged on a shock absorber, and the hardness of the shock absorber is changed by adjusting the compression amount of a spring on the shock absorber. The structure comprises an inner sleeve and an adjusting sleeve sleeved on the outer peripheral surface of the inner sleeve, the inner peripheral surface of the adjusting sleeve is provided with an internal thread, the outer peripheral surface of the inner sleeve is provided with an external thread, and the external thread and the internal thread are meshed together; the outer sleeve is used for providing axial supporting force for a spring in the shock absorber by taking the inner sleeve as a supporting foundation. A plurality of positioning holes are formed in the adjusting sleeve, the inner ends of the positioning holes face an opening of the inner sleeve, positioning columns are arranged in the positioning holes, the ends, facing the inner sleeve, of the positioning columns are positioning ends, and stress structures are connected to the positioning columns. By operating the stress structure, the positioning end is used for abutting against the external thread, so that the circumferential position of the adjusting sleeve on the inner sleeve is positioned and locked, or the positioning end is unlocked.

Description

Technical Field

[0001] This utility model relates to a shock absorber, and more particularly to an adjustment mechanism on a shock absorber for adjusting the stiffness of the shock absorber. Background Technology

[0002] To improve vehicle ride comfort, shock absorbers are installed at appropriate locations on the vehicle. These shock absorbers effectively reduce vibrations generated during driving. The structure of a shock absorber includes connecting structures at both ends, which are used to securely connect to corresponding parts on the vehicle. A spring is installed between the two connecting structures, with both ends providing axial elastic support. Inside the spring, between the two connecting structures, is a hydraulic cylinder-type damper. The piston rod of the damper is connected to one connecting structure, and the cylinder body is fixedly connected to the other connecting structure. The damper and spring work together to generate elastic force, thereby reducing vehicle vibrations.

[0003] Chinese patent document (publication number: CN217463034U) discloses an adjustable stiffness automotive shock absorber, relating to the field of shock absorber technology. The outer surface of the cylinder body has four sets of evenly distributed positioning holes in a rectangular shape. A lower limit member is slidably mounted on the surface of the cylinder body. The side of the lower limit member has four bolt holes in a rectangular shape that match the four sets of positioning holes. Each bolt hole and the positioning hole aligned with it share a bolt. The size of the bolt is adapted to the positioning holes and bolt holes. Screwing the four bolts into the four equally high positioning holes at different heights changes the position of the lower limit member, thereby changing the distance between the upper and lower limit members. This allows the device to accommodate springs of various lengths, increasing its practicality. The upper limit member is connected to the piston rod via an external threaded connection to a threaded hole. The lower limit member is mounted on the cylinder body using four bolts, allowing both the upper and lower limit members to be removed for easy replacement.

[0004] In this type of shock absorber, the spring compression is altered by inserting bolts into locating holes at different axial positions on the cylinder body, thus adjusting the shock absorber's stiffness. The locating holes on the cylinder body are spaced axially, resulting in a non-linear, segmented adjustment of the spring compression during adjustment, which cannot achieve precise adjustment of the shock absorber's stiffness. Furthermore, shock absorbers with threaded stiffness adjustment mechanisms are now available on the market. To achieve smooth adjustment, the meshing threads cannot be too tight. However, since the spring itself is helical, compression generates a tangential force on the adjustment mechanism. The adjustment mechanism, with a lower thread engagement, will therefore rotate circumferentially, altering the shock absorber's stiffness over time. Thus, a conflict arises between smooth adjustment and maintaining the spring's adjustment range, causing problems in practical applications. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a damper stiffness adjustment mechanism, which facilitates linear adjustment of the stiffness of the spring in the damper and maintains the adjustment amount of the spring.

[0006] To solve the aforementioned technical problem, the present invention provides the following technical solution: a shock absorber stiffness adjustment mechanism, comprising an inner sleeve and an adjusting sleeve fitted onto the outer circumferential surface of the inner sleeve. The adjusting sleeve has an internal thread on its inner circumferential surface and an external thread on its outer circumferential surface, the external thread and the internal thread meshing together. The outer sleeve is used to provide axial support force to the spring in the shock absorber, with the inner sleeve serving as a support base. The mechanism is characterized by having a plurality of positioning holes within the adjusting sleeve, the inner ends of which open towards the inner sleeve. A positioning post is provided within each positioning hole, the end of which faces the inner sleeve being the positioning end. A force-bearing structure is connected to the positioning post. By operating the force-bearing structure, the positioning end is used to abut against the external thread to achieve circumferential positioning and locking of the adjusting sleeve on the inner sleeve, or to unlock the positioning end.

[0007] The connection structure between the inner sleeve and the end of the shock absorber is generally kept relatively axially fixed. The inner sleeve can be directly fixed to the connection structure, or it can be located at the end position close to the multi-segment spring. The inner sleeve provides an axial support base for the adjusting sleeve. During adjustment, the axial position of the adjusting sleeve on the inner sleeve is changed by rotating the adjusting sleeve, thereby changing the spring compression and thus adjusting the overall stiffness of the shock absorber.

[0008] The positioning pin can move axially within the positioning hole. The movement of the positioning pin is caused by the force applied to the load-bearing structure. Generally, tools such as wrenches, screwdrivers, or hex wrenches are used to achieve the movement of the positioning pin.

[0009] Furthermore, the positioning end is provided with a protruding protrusion for inserting into the thread groove of the external thread. By inserting the protrusion into the thread groove, damage to the outer edge of the external thread can be effectively reduced, so that the outer edge of the external thread will not be significantly damaged during locking. This ensures the engagement of the internal and external threads and facilitates smooth rotation of the adjusting sleeve on the inner sleeve during subsequent adjustments.

[0010] Furthermore, the protrusion is a threaded tooth, and the lateral orientation of the threaded tooth in the axial direction of the inner sleeve is adapted to the lateral orientation of the external thread. The protrusion adapts well to the external thread structure, and the locking stability between the protrusion and the external thread is good when locking is achieved.

[0011] Furthermore, there are at least two spiral teeth which are arranged side by side and spaced apart axially on the inner sleeve. Different spiral teeth are inserted into different spiral grooves of the external thread, which further improves the stability during locking.

[0012] Furthermore, the width of the spiral tooth is slightly smaller than the width of the spiral groove. This enables the spiral tooth to well adapt to the structural form where the positioning post is a stud, facilitating the switching of the positioning post between the locked and unlocked states.

[0013] Furthermore, the positioning hole is arranged radially along the adjusting sleeve and penetrates the wall of the adjusting sleeve. The positioning post is arranged coaxially with the positioning hole in a threaded manner, and the force-bearing structure is arranged at the outer end of the positioning post. This facilitates the operation of the positioning post, making the locking and unlocking of the positioning post convenient.

[0014] Furthermore, the force-bearing structure is a countersunk hexagon socket. The positioning post can be operated by a hexagon wrench, enabling the positioning post to conveniently achieve the stable locking of the adjusting sleeve on the inner sleeve. Of course, the force-bearing structure can also be a slotted screwdriver head or a Phillips screwdriver head, and the positioning post can be operated by a corresponding screwdriver.

[0015] Furthermore, the adjusting sleeve is in a "convex" shape. An annular force-bearing opening is formed at one end of the adjusting sleeve. The cross-section of the force-bearing opening is in an L shape, and several bosses are integrally formed in the force-bearing opening. The positioning hole is arranged at the position of the boss. This facilitates the application of force to the adjusting sleeve, making the adjustment of the adjusting sleeve convenient. By arranging the positioning hole at the position of the boss, the positioning hole has a certain axial depth, ensuring the stability of the positioning post in the positioning hole.

[0016] The beneficial effects of the present utility model are as follows: When this adjusting mechanism is applied to a shock absorber, it can adjust the compression amount of the spring in the shock absorber, thereby changing the softness and hardness of the shock absorber. By threadedly connecting the adjusting sleeve to the inner sleeve, a linear adjustment of the compression amount of the spring can be achieved, and thus an accurate adjustment of the softness and hardness of the shock absorber can be realized. By arranging the positioning post, the positioning post locks the circumferential position of the adjusting sleeve by abutting against the external thread on the inner sleeve. After the adjustment of the compression amount of the spring is completed, the axial stability of the adjusting sleeve on the inner sleeve is good, and the spring will not cause the adjusting sleeve to rotate due to working expansion and contraction, thus being able to well meet the actual use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the shock absorber softness and hardness adjusting mechanism.

[0018] Figure 2 is Figure 1 an exploded view of

[0019] In the diagram, 1 is the inner sleeve; 2 is the adjusting sleeve; 21 is the boss; 22 is the force-bearing port; 23 is the positioning hole; 3 is the external thread; 31 is the thread groove; 4 is the positioning pin; 41 is the internal hexagon countersunk hole; 42 is the thread tooth; and 5 is the internal thread. Detailed Implementation

[0020] Referring to the accompanying drawings, this adjustment mechanism is installed on the shock absorber and is used to adjust the stiffness of the shock absorber. The object of adjustment is the spring on the shock absorber, and the target of adjustment is the axial length of the spring, so that the compression of the spring can be adjusted, thereby realizing the adjustment of the stiffness of the shock absorber.

[0021] The structure of this adjustment mechanism includes an inner sleeve 1 and an adjusting sleeve 2. The inner sleeve 1 can be directly fixed to the end connection structure of the shock absorber, or it can be positioned at the two ends of a segmented spring. The adjusting sleeve 2 is fitted onto the outer circumference of the inner sleeve 1. When the spring is a one-piece structure, one end of the spring is supported on one end of the adjusting sleeve 2. When the spring is a segmented structure, two adjusting sleeves 2 are required on the inner sleeve 1, one of which supports one end of a segment of the spring. The adjustment mechanism shown in the figure is adapted to a one-piece spring. To facilitate the rotation of the adjusting sleeve 2, the adjusting sleeve 2 is convex in shape, thus forming an annular force-bearing port 22 at the left end of the adjusting sleeve 2. The cross-section of the force-bearing port 22 is L-shaped. Four bosses 21 are integrally formed protruding from the force-bearing port 22 on the left end face of the adjusting sleeve 2. Generally, force is applied to the sides of the bosses 21 using pipe wrenches or fingers to achieve the rotation of the adjusting sleeve 2 on the inner sleeve 1. The positioning hole 23 is arranged radially along the adjusting sleeve 2, and the positioning hole 23 penetrates the wall of the adjusting sleeve 2. The positioning hole 23 is located at the position of the boss 21 and penetrates the boss 21. The positioning pin 4 is coaxially arranged with the positioning hole 23. The force-bearing structure is arranged on the outer end of the positioning pin 4, and the force-bearing structure is an internal hexagon countersunk hole 41.

[0022] An internal thread 5 is provided on the inner circumferential surface of the adjusting sleeve 2, and an external thread 3 is provided on the outer circumferential surface of the inner sleeve 1. The external thread 3 and the internal thread 5 mesh together, allowing the adjusting sleeve 2 to rotate on the inner sleeve 1 and change its axial position, thereby adjusting the spring compression. The thread is formed by a helical strip protruding on the corresponding component, which extends helically on the corresponding component, thus forming a helical groove 31 on the corresponding component. Several positioning holes 23 are provided inside the adjusting sleeve 2, and these positioning holes 23 are evenly distributed circumferentially on the adjusting sleeve 2. The inner end of the positioning hole 23 opens towards the inner sleeve 1, and a positioning pin 4 is provided in each positioning hole 23. The end of the positioning pin 4 facing the inner sleeve 1 is the positioning end, and a force-bearing structure is connected to the positioning pin 4. By operating the force-bearing structure, the positioning end is used to abut against the external thread 3 to lock the circumferential position of the adjusting sleeve 2 on the inner sleeve 1, or to unlock the positioning end. The force-bearing structure can be the internal hexagon countersunk hole 41, or it can be a lever mechanism that extends into the positioning hole 23. An eccentric structure is provided on the lever mechanism. The eccentric structure is used to act on the positioning pin 4. By levering the lever mechanism, the positioning pin 4 can move axially in the positioning hole 23, thereby achieving the purpose of locking or unlocking the adjusting sleeve 2 on the inner sleeve 1.

[0023] Figure 2 As shown, the positioning end of the positioning post 4 has a protruding protrusion. The lateral dimension of the protrusion is smaller than that of the positioning post 4. The protrusion is used to insert into the threaded groove 31 of the external thread 3. The protrusion is a threaded tooth 42, the width of which is slightly smaller than the width of the threaded groove 31. The lateral orientation of the threaded tooth 42 in the axial direction of the inner sleeve 1 matches the lateral orientation of the external thread 3. When the locking of the adjusting sleeve 2 is released, the threaded tooth 42 is located in the threaded groove 31, and the threaded tooth 42 generally does not abut against the side of the external thread 3, thus facilitating the rotation of the adjusting sleeve 2 on the inner sleeve 1. There are generally multiple threaded teeth 42. Figure 2 The image shows that there are three screw teeth 42. These three screw teeth 42 are arranged side by side and spaced apart in the axial direction of the inner sleeve 1. The three screw teeth 42 are respectively inserted into different screw grooves 31.

Claims

1. A damper stiffness adjustment mechanism, comprising an inner sleeve and an adjusting sleeve fitted onto the outer circumferential surface of the inner sleeve, wherein the inner circumferential surface of the adjusting sleeve is provided with an internal thread, and the outer circumferential surface of the inner sleeve is provided with an external thread, the external thread and the internal thread engaging together; the outer sleeve is used to provide axial support force to the spring in the damper, using the inner sleeve as a support base, characterized in that, The adjusting sleeve is provided with several positioning holes, the inner end of the positioning hole faces the opening of the inner sleeve, and a positioning post is provided in the positioning hole. The end of the positioning post facing the inner sleeve is the positioning end. A force-bearing structure is connected to the positioning post. By operating the force-bearing structure, the positioning end is used to abut against the external thread to realize the circumferential position positioning and locking of the adjusting sleeve on the inner sleeve, or to realize the locking of the positioning end.

2. The damper stiffness adjustment mechanism according to claim 1, characterized in that, The positioning end is provided with a protruding protrusion, which is used to be inserted into the thread groove of the external thread.

3. The damper stiffness adjustment mechanism according to claim 2, characterized in that, The protrusion is a threaded tooth, and the lateral orientation of the threaded tooth in the axial direction of the inner sleeve is adapted to the lateral orientation of the external thread.

4. The damper stiffness adjustment mechanism according to claim 3, characterized in that, The screw teeth are at least two in number and are arranged side by side at intervals along the axial direction of the inner sleeve. Different screw teeth are inserted into different grooves of the external thread.

5. The damper stiffness adjustment mechanism according to claim 4, characterized in that, The width of the screw teeth is slightly smaller than the width of the screw groove.

6. The damper stiffness adjustment mechanism according to any one of claims 1 to 5, characterized in that, The positioning hole is arranged radially along the adjusting sleeve and penetrates the wall of the adjusting sleeve. The positioning post and the positioning hole thread are arranged coaxially. The force-bearing structure is arranged on the outer end of the positioning post.

7. The damper stiffness adjustment mechanism according to claim 6, characterized in that, The stress-bearing structure is a countersunk hole with an internal hexagonal socket.

8. The damper stiffness adjustment mechanism according to claim 6, characterized in that, The adjusting sleeve is convex, and an annular force-receiving port is formed on one end of the adjusting sleeve. The cross-section of the force-receiving port is L-shaped, and several protrusions are integrally formed inside the force-receiving port. The positioning hole is set at the position of the protrusion.

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