A shock absorber with adjustable damping force

Abstract

The present invention provides a shock absorber with adjustable damping force, belonging to the technical field of shock absorbers. It solves the problem that the existing shock absorbers cannot adjust the damping force internally after being assembled. This shock absorber includes a cylinder sleeve and a connecting rod passing through the cylinder sleeve. A piston is arranged on the connecting rod. A valve gasket for slowing down the passage of hydraulic oil through the piston is arranged on one side surface of the piston. A spring, a slider, and an adjusting block are sequentially sleeved on the connecting rod. The slider is circumferentially fixed to the connecting rod. Two ends of the spring respectively abut against the valve gasket and the slider. A blocking member for blocking the adjusting block is arranged at the end of the connecting rod. The slider abuts against the adjusting block under the action of the spring force. A distance adjusting structure is arranged on the slider and the adjusting block. The distance adjusting structure changes the distance between the slider and the valve gasket by means of concave-convex insertion at different positions and realizes the relative rotation between the slider and the adjusting block by limiting the circumferential rotation of the adjusting block. This shock absorber realizes the hidden adjustment of the damping force and has the advantages of convenient and stable adjustment.

Description

Technical Field

[0001] The present invention belongs to the technical field of shock absorbers, and relates to a shock absorber, in particular to a shock absorber with adjustable damping force. Background Art

[0002] There are many types of shock absorbers, including single-cylinder shock absorbers and double-cylinder shock absorbers, among which double-cylinder shock absorbers are more commonly used in automobiles. A double-cylinder shock absorber usually consists of a cylinder liner, a connecting rod, a piston, a valve gasket, a top valve assembly, a bottom valve assembly, etc. The cylinder liner of the double-cylinder shock absorber is of an inner and outer double-cylinder type. Both the inner cylinder and the outer cylinder are filled with hydraulic oil and are connected through the top valve assembly and the bottom valve assembly. The connecting rod passes through the outer cylinder and extends into the inner cylinder, and the piston is fixed on the connecting rod. The piston forms a circumferential seal with the inner cylinder wall, and the piston is provided with liquid passing holes through which the hydraulic oil can pass. When the connecting rod axially displaces, the sliding of the piston will cause the hydraulic oil to flow through the liquid passing holes into the cavity with a smaller pressure. The valve gasket is made of an elastic material and has the characteristics of being deformed and restored. At the orifice of the liquid passing hole, to prevent the valve gasket, when the hydraulic oil passes through, it will be blocked by the valve gasket and needs to elastically deform to pass through. Therefore, the valve gasket generates a damping force on the hydraulic oil.

[0003] Since the shock absorber is used frequently in daily life, the valve gasket is easily caused to gradually decline in restoration ability due to the increase in the number of deformations, resulting in poor damping force and weakened shock absorption effect of the shock absorber. Moreover, with the improvement of our living standards, different users have different feelings about the soft and hard degrees of the shock absorbers applied on vehicles during shock absorption. Some people like harder shock absorbers while some like softer shock absorbers. The soft and hard degrees of the above shock absorbers actually depend on the magnitude of the damping force of the valve gasket on the hydraulic oil. The speed of deformation to restoration of the valve gasket determines the soft and hard degrees of the shock absorber. Later, with the progress and development of technology, some people also sleeved a spring at the end of the connecting rod. One end of the spring presses against the valve gasket to increase the damping force when the hydraulic oil pushes open the valve gasket, and then the damping force is adjusted by setting the pre-tightening force of the spring at the factory. With the aging of the valve gasket itself during use, but the elastic force of the spring can be adjusted to increase the damping force of the valve gasket on the hydraulic oil. If the damping force is too large, only the tightness of the spring needs to be adjusted. Of course, springs with different pre-tightening forces can also be adjusted for different customers at the factory to achieve the adjustment of the soft and hard degrees of the shock absorber. Although such a setting solves the problem of adjustable damping force of the shock absorber to a certain extent, such adjustment is more troublesome. The reason is that both the inner and outer cylinders of the double-cylinder shock absorber are filled with hydraulic oil. Adjusting the spring later requires disassembling the inner and outer cylinders. After such an operation, the sealing performance of the shock absorber cannot be guaranteed, and it is also impossible to know whether the user can accept it after adjusting the pre-tightening force of the spring at the factory. Therefore, it cannot be promoted. So solving the above existing problems is an urgent matter to be dealt with at present. Summary of the Invention

[0004] The object of the present invention is to propose a shock absorber with adjustable damping force in view of the above problems existing in the prior art. It solves the technical problem that the damping force of the existing shock absorber cannot be adjusted internally after being assembled.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A shock absorber with adjustable damping force includes a cylinder sleeve and a connecting rod passing through the cylinder sleeve. A piston is arranged on the connecting rod. A valve gasket for slowing down the passage of oil through the piston is arranged on one side of the piston. It is characterized in that a spring, a slider and an adjusting block are sequentially sleeved on the connecting rod. The slider is circumferentially fixed to the connecting rod. The two ends of the spring respectively abut against the valve gasket and the slider. A blocking member for blocking the adjusting block is arranged at the end of the connecting rod. The slider abuts against the adjusting block under the action of the spring force. A distance adjusting structure is arranged on the slider and the adjusting block. The distance adjusting structure changes the distance between the slider and the valve gasket by means of concave-convex insertion at different positions and realizes the relative rotation between the slider and the adjusting block by restricting the circumferential rotation of the adjusting block.

[0007] A valve gasket for slowing down the passage of oil through the piston is arranged on one side of the piston. The valve gasket is an elastic member. The piston has a liquid passing hole for the oil to pass through. The valve gasket abuts against the orifice of the liquid passing hole. The oil needs to push the valve gasket to make it deform before it can pass through the liquid passing hole. In this way, the valve gasket generates a damping force on the passage of the oil.

[0008] In this shock absorber, a spring, a slider and an adjusting block are sequentially sleeved on the connecting rod. The slider is circumferentially fixed to the connecting rod. The two ends of the spring respectively abut against the valve gasket and the slider. A blocking member for blocking the adjusting block is arranged at the end of the connecting rod. The slider abuts against the adjusting block under the action of the spring force. Since the slider and the adjusting block are sleeved on the connecting rod, the two can slide relative to the connecting rod. The blocking member plays a role in limiting the adjusting block and can prevent the adjusting block from falling out of the connecting rod. The spring is located between the valve gasket and the slider and is in a compressed state. Such a setting makes one end of the spring abut against the valve gasket, making it difficult for the valve gasket to deform under the push of the oil, that is, the damping force on the oil becomes larger. The other end of the spring abuts against the slider, making the slider, the adjusting block and the blocking member abut against each other in sequence. The adjusting block is clamped and limited by the slider and the blocking member, and under the action of the spring force, these three also always maintain a tendency of abutting against each other. If the positions of the valve gasket and the slider remain unchanged, the elastic force of the spring acting on the valve gasket is constant, and the damping force of the valve gasket will not change.

[0009] Therefore, to adjust the damping force of the valve gasket on the hydraulic oil, it is only necessary to change the elastic force of the spring acting on the valve gasket. Specifically, a distance adjustment structure is provided on the slider and the adjustment block. The distance adjustment structure changes the distance between the slider and the valve gasket by means of concave-convex insertion at different positions and realizes the relative rotation between the slider and the adjustment block by restricting the circumferential rotation of the adjustment block. The distance adjustment structure consists of two parts: one part can change the position of the slider by means of concave-convex insertion at different positions between the slider and the valve gasket, thereby changing the pre-tightening force of the spring; the other part restricts the circumferential rotation of the adjustment block, so that the rotating link can make the link rotate relative to the adjustment block, and the slider and the link are circumferentially fixed, that is, the rotating link can make the slider rotate relative to the adjustment block. By the relative rotation of the slider and the adjustment block, the concave-convex insertion at different positions between the slider and the adjustment block is realized. One end of the adjustment block abuts against the blocking part. Therefore, the slider will overcome the spring elastic force displacement due to different insertion positions and change its position. When the position changes, the elastic force of the spring changes, and the damping force generated by the valve gasket also changes accordingly. This design realizes the internal hidden adjustment of the damping force in the cylinder liner by rotating the link after the shock absorber is assembled, and the operation is simple, which is suitable for popularization.

[0010] In the above-mentioned shock absorber with adjustable damping force, the distance adjustment structure includes a positioning groove group opened on the slider and a clamping block located on the adjustment block. The positioning groove group consists of several positioning grooves with gradually decreasing depths. The clamping block changes the distance between the slider and the valve gasket by abutting against the bottom of different positioning grooves.

[0011] Since the slider abuts against the adjustment block under the action of the spring elastic force, the positioning groove group and the clamping block are respectively arranged on the end faces of the slider and the adjustment block facing each other. When the clamping block abuts against the bottom of the positioning grooves with different depths, the axial position of the slider will change due to the different matching depths between the slider and the adjustment block, that is, the pre-tightening force of the spring changes. This setting realizes the effect of adjusting the damping force of the shock absorber. The advantage of the cooperation of the positioning groove group and the clamping block designed in this way to adjust the position of the slider is that when not adjusted, the adjustment block is linked with the link, and the groove wall of the positioning groove can play a certain role in resisting the clamping block. After the spring elastic force is adjusted, the state of the spring is more stable during the use of the shock absorber. Secondly, before assembling the shock absorber, we can also test the damping force generated by the valve gasket when the clamping block is inserted into each positioning groove, so as to realize the precise adjustment of the damping force during the later internal hidden adjustment.

[0012] The positions of the positioning groove group and the clamping block can be interchanged, that is, a positioning groove group is provided on the adjustment block and a clamping block is arranged on the slider. After the interchange, the same adjustment effect is achieved.

[0013] In the above-mentioned shock absorber with adjustable damping force, the same-side groove walls of each of the positioning grooves are inclined guiding surfaces, and the clamping block is provided with inclined surfaces that cooperate with the guiding surfaces.

[0014] The function of the guiding surface is to enable the clamping block to slide into the adjacent positioning groove along the inclined guiding surface more easily when the slider rotates relative to the adjusting block, without getting stuck by the groove wall of the positioning groove and being difficult to rotate. Corresponding inclined surfaces are also provided on the clamping block. When the slider and the adjusting block rotate relative to each other, the cooperation between the inclined surface and the guiding surface enables the clamping block to better switch between positioning grooves of different depths, and more conveniently adjust the elastic force of the spring. The guiding surfaces on the positioning grooves are provided on the groove walls on the same side. Such a setting makes the connecting rod can only rotate in one direction for adjustment, preventing phenomena such as forgetting to adjust the position.

[0015] In the above-mentioned shock absorber with adjustable damping force, the slider has two sets of positioning groove groups distributed in a centrosymmetric manner, and the adjusting block also has two clamping blocks distributed in a centrosymmetric manner.

[0016] Due to the setting of the two sets of positioning groove groups distributed in a centrosymmetric manner and the two clamping blocks distributed in a centrosymmetric manner, the two clamping blocks can be simultaneously clamped into the positioning grooves of the same depth. Moreover, when the slider rotates relative to the adjusting block, the cooperation directions of the inclined surfaces on the two clamping blocks and the guiding surfaces on the positioning grooves are the same. Therefore, the slider and the adjusting block can rotate relative to each other in one direction, and the clamping blocks can rotate and be clamped into the positioning grooves of different depths as they rotate, so that the slider approaches or moves away from the valve gasket, thereby changing the spring elastic force.

[0017] In the above-mentioned shock absorber with adjustable damping force, the distance adjustment structure further includes a supporting foot located on the adjusting block. A limiting ring is provided at the bottom of the cylinder sleeve, and a groove is opened on the inner side surface of the limiting ring. The supporting foot circumferentially limits the adjusting block by being clamped into the groove.

[0018] This shock absorber has two states: one is the normal working state. Since the limiting ring is located at the bottom of the cylinder sleeve, the supporting foot on the adjusting block is not clamped and limited by the limiting ring. At this time, there is no relative rotation between the adjusting block and the slider, and the spring elastic force is in a constant state; the other is the adjustment state. By pushing the connecting rod towards the bottom of the cylinder sleeve, the supporting foot on the adjusting block contacts the limiting ring and then continues to apply a thrust to the connecting rod and rotate the connecting rod. When the supporting foot rotates to the position of the groove, the supporting foot will extend into the groove, so that the adjusting block is circumferentially limited by the limiting ring. At this time, continuing to rotate the connecting rod can start the adjustment to make the clamping block be clamped into different positioning grooves, completing the adjustment of the spring elastic force. After the adjustment is completed, just let the connecting rod return to its original position. In this way, the internal hidden adjustment of the damping force is more convenient and suitable for wide application.

[0019] In the above-mentioned shock absorber with adjustable damping force, the limiting ring has two grooves and is symmetrically distributed, and the supporting foot also has two corresponding to the grooves.

[0020] The limiting ring is circumferentially provided with two symmetrically distributed grooves, and the adjusting block also has two symmetrically arranged abutting feet. Both of the two abutting feet can be simultaneously inserted into different grooves, and such a setting provides higher stability during adjustment.

[0021] In the above-mentioned damper with adjustable damping force, a slidable spring seat is also circumferentially fixed on the connecting rod between the valve gasket and the spring. The spring presses against the spring seat, and the spring seat presses against the valve gasket under the action of the spring force of the spring.

[0022] The spring directly abuts against the valve gasket. The contact area between one end of the spring and the valve gasket is small, and the force is uneven. Also, since the valve gasket is an elastic part, its outer edge deforms first due to deformation. The spring seat is in surface-to-surface contact with the valve gasket, with a larger contact area, more uniform force, better effect, and better blocking effect on the valve gasket.

[0023] In the above-mentioned damper with adjustable damping force, a bushing is inserted through the connecting rod, and the slider is sleeved outside the bushing and is circumferentially fixed to the connecting rod through the bushing.

[0024] In the above-mentioned damper with adjustable damping force, the blocking part is a nut threadedly connected to the end of the connecting rod.

[0025] Compared with the prior art, the advantages of this product are as follows: The distance adjustment structure of this damper includes a structure that enables the concave-convex insertion between the slider and the valve gasket at different positions and a structure that circumferentially fixes the adjusting block to rotate relative to each other so that the slider can rotate relative to the adjusting block. After such a setting, the relative rotation of the slider and the adjusting block is used to realize the concave-convex insertion of the two at different positions, change the distance between the slider and the valve gasket, and thus change the elastic force of the spring, thereby realizing the hidden adjustment of the damping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a partial enlarged view of part A of the present invention;

[0028] Figure 3 is a part drawing of the present invention;

[0029] Figure 4 is a part drawing of a part of the present invention;

[0030] Figure 5 is a part drawing of the slider of the present invention;

[0031] Figure 6 is a side view of the slider of the present invention;

[0032] Figure 7It is the part drawing of the adjusting block of the present invention;

[0033] Figure 8 It is the part drawing of the limiting ring of the present invention.

[0034] In the figure, 1. cylinder liner; 2. connecting rod; 3. piston; 4. valve gasket; 5. spring; 6. slider; 61. positioning groove group; 611. positioning groove; 6111. guiding surface; 7. adjusting block; 71. clamping block; 711. inclined surface; 72. abutting foot; 8. limiting ring; 81. groove; 9. spring seat; 10. bush; 11. blocking part. Detailed implementation manners

[0035] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0036] Embodiment 1

[0037] As Figure 1 and Figure 2 shown, a shock absorber with adjustable damping force includes a cylinder liner 1, a connecting rod 2 and a piston 3. The cylinder liner 1 of this shock absorber is of a double-cylinder type with an inner cylinder and an outer cylinder. The inner cylinder is located inside the outer cylinder and both the inner and outer cylinders are filled with hydraulic oil. A top valve and a bottom valve are also provided between the inner cylinder and the outer cylinder and they are communicated through the top valve and the bottom valve. The connecting rod 2 sequentially passes through the outer cylinder, the top valve and the inner cylinder from the top end of the outer cylinder and extends into the inner cavity of the inner cylinder. The piston 3 is sleeved on the connecting rod 2 and is fixedly connected to the connecting rod 2. A seal is formed between the piston 3 and the inner side wall of the inner cylinder and liquid passing holes are formed on the piston 3. The liquid passing holes communicate the chambers on both sides of the piston 3. With such a setting, when the connecting rod 2 is pulled, the piston 3 also slides accordingly, so that the hydraulic oil enters the low-pressure chamber from the high-pressure chamber through the liquid passing holes on the piston 3. A valve gasket 4 with elastic deformation ability is also sleeved on the connecting rod 2. The left side of the valve gasket 4 abuts against the orifice of the liquid passing hole, and the right side of the valve gasket 4 is positioned by a bush 10 fixed on the connecting rod 2. With such a setting, when the piston 3 moves and the hydraulic oil passes through the liquid passing hole, it is necessary to make the valve gasket 4 deform to open the liquid passing hole, and the valve gasket 4 generates a damping force on the passing of the hydraulic oil.

[0038] As Figure 2 and Figure 3As shown in the figure, a spring seat 9, a spring 5, a slider 6, an adjusting block 7, and a blocking member 11 are sequentially sleeved on the connecting rod 2 of the shock absorber. The blocking member 11 is preferably a nut, which is threadedly connected to the end of the connecting rod 2 to block the adjusting block 7 to prevent it from falling out. The two ends of the spring 5 respectively abut against the spring seat 9 and the slider 6. Under the action of the elastic force of the spring 5, the spring seat 9 always tends to abut against the valve gasket 4. The slider 6, the adjusting block 7, and the nut abut against each other under the action of the elastic force of the spring 5. Since the spring 5 directly abuts against the valve gasket 4 and the force is uneven, and the contact area between the spring 5 and the valve gasket 4 is small, the contact area between the spring seat 9 and the valve gasket 4 is increased through the setting of the spring seat 9, so that the force when the spring seat 9 abuts against the valve gasket 4 is more uniform and the effect is better.

[0039] The slider 6 and the connecting rod 2 are circumferentially fixed through a bushing 10. Such a setting makes the slider 6 and the connecting rod 2 circumferentially linked. Since the adjusting block 7 is sleeved on the connecting rod 2, it can rotate relative to the slider 6. A distance adjusting structure is provided on the slider 6 and the adjusting block 7. The distance adjusting structure consists of two parts: one part is that the slider 6 and the adjusting block 7 are inserted into different positions in a concave-convex manner, so that the position between the slider 6 and the valve gasket 4 is changed, thereby changing the pre-tightening force of the spring 5; the other part is that the circumferential position of the adjusting block 7 can be limited by a limiting ring 8 arranged in the cylinder liner, so that when the connecting rod 2 is rotated, the connecting rod 2 can rotate relative to the adjusting block 7. The two parts are combined to rotate the connecting rod 2 to drive the slider 6 to rotate relative to the adjusting block 7, so that the slider 6 and the adjusting block 7 are inserted into different positions in a concave-convex manner to change the distance between the slider 6 and the spring seat 9. After the distance between the slider 6 and the spring seat 9 is changed, the spring 5 is compressed between the two, and the pre-tightening force of the spring 5 will change accordingly. Therefore, when the oil pushes the valve gasket 4 to deform it, the force required to push the spring seat 9 away by the deformed part against the spring seat 9 will change, that is, the damping force of the valve gasket 4 on the oil changes with the change of the elastic force of the spring 5. Therefore, to adjust the damping force of the valve gasket 4, only the elastic force of the spring 5 acting on the valve gasket 4 needs to be changed. The relative rotation of the slider 6 and the adjusting block 7 is used to realize that the distance adjusting device is inserted into different positions in a concave-convex manner. One end of the adjusting block 7 is restricted from moving by the nut, so the slider 6 will be forced to slide against the elastic force of the spring 5 due to different insertion positions. When its position changes, the elastic force of the spring 5 changes, and the damping force generated by the valve gasket 4 also changes accordingly. Such a setting realizes the adjustment of the damping force by rotating the connecting rod 2 in the cylinder liner 1 after the shock absorber is assembled.

[0040] As Figures 2 - 8As shown in the figure, the specific connection method of this distance adjustment structure is as follows: a positioning groove group 61 is provided on the right side surface of the slider 6, and a protruding clamping block 71 is provided on the left side surface of the adjusting block 7. The positioning groove group 61 is composed of several positioning grooves 611 with gradually decreasing depths. The slider 6 and the adjusting block 7 realize the change of the axial position of the slider 6 by the clamping block 71 abutting against the bottoms of different positioning grooves 611, that is, when the clamping block 71 is inserted into a deeper positioning groove 611, the slider 6 moves away from the spring seat 9 and the spring 5 stretches, the elastic force of the spring 5 acting on the spring seat 9 decreases, and the damping force of the valve gasket 4 decreases; when the clamping block 71 is stuck into a shallower positioning groove 611, the slider 6 approaches the spring seat 9, the spring 5 is further compressed, and the elastic force acting on the spring seat 9 will increase correspondingly, and the damping force of the valve gasket 4 becomes larger. When the clamping block 71 abuts against the bottoms of the positioning grooves 611 with different depths, the axial position of the slider 6 will change due to the different matching depths between the slider 6 and the adjusting block 7, resulting in the change of the spring elastic force, achieving the effect of adjusting the damping force of the shock absorber.

[0041] The advantage of the cooperation between the positioning groove group 61 and the clamping block 71 in changing the position of the slider 6 to adjust the elastic force of the spring 5 is that the groove wall of the positioning groove 611 can play a certain blocking role on the clamping block 71 when not adjusted, making the elastic force of the spring 5 more stable during the subsequent use of the shock absorber. Secondly, before assembling the shock absorber, we can test the damping force generated by the valve gasket 4 when the clamping block 71 is stuck into each positioning groove 611 to achieve precise adjustment of the damping force during the subsequent internal hidden adjustment.

[0042] The present distance adjustment structure further includes two footrests 72 which are centrally symmetrically distributed on the adjustment block 7. A limit ring 8 is also fixed between the bottom valve and the inner cylinder at the bottom of the cylinder liner 1. Two symmetrical grooves 81 are provided on the inner side surface of the limit ring 8. The footrest 72 circumferentially limits the adjustment block 7 by being snapped into the groove 81. This shock absorber has two states: one is the normal working state. Since the limit ring 8 is fixed between the bottom valve and the inner cylinder, the footrest 72 on the adjustment block 7 is not engaged and limited with the limit ring 8. At this time, there is no relative rotation between the adjustment block 7 and the slider 6, and the elastic force of the spring 5 is in a constant state. The other is the adjustment state. By pushing the connecting rod 2 towards the bottom of the cylinder liner 1, when the footrest 72 on the adjustment block 7 contacts the limit ring 8 and continues to apply a driving force to the connecting rod 2 and rotates the connecting rod 2, at this time, due to the certain abutment between the clamping block 71 and the groove wall of the positioning groove 611, the adjustment block 7 can be circumferentially linked with the connecting rod 2. When the footrest 72 rotates to the position of the groove 81, the footrest 72 extends into the groove 81, so that the adjustment block 7 is circumferentially limited by the limit ring 8. At this time, continuing to rotate the connecting rod 2 can start the adjustment to make the clamping block 71 snap into different positioning grooves 611, completing the adjustment of the elastic force of the spring 5. After the adjustment is completed, just reset the connecting rod 2. In this way, the internal hidden adjustment of the damping force is more convenient and suitable for wide application. One side groove wall of the positioning groove 611 is an inclined guiding surface 6111, and the clamping block 71 is provided with an inclined surface 711 which cooperates with the guiding surface 6111. Each positioning groove 611 has a guiding surface 6111 on the side wall close to the adjacent side with a decreasing depth. The function of the guiding surface 6111 is to enable the clamping block 71 to slide along the inclined guiding surface 6111 into the adjacent positioning groove 611 with a shallower depth when the slider 6 rotates relative to the adjustment block 7. The slider 6 will displace towards the valve gasket 4 direction to compress the spring 5, increasing the damping force of the valve gasket 4. And the clamping block 71 is also correspondingly provided with an inclined surface 711. When the slider 6 and the adjustment block 7 rotate relative to each other, the cooperation between the inclined surface 711 and the guiding surface 6111 enables the clamping block 71 to rotate better towards one side and snap into the adjacent positioning groove 611, more conveniently adjusting the elastic force of the spring 5 and avoiding the phenomenon of jamming and inability to rotate due to the cooperation between the block and the groove. The positioning groove group 61 on the slider 6 has two groups and is centrally symmetrically distributed, and the adjustment block 7 also has two clamping blocks 71 which are centrally symmetrically distributed. The setting of the two groups of centrally symmetrically distributed positioning groove groups 61 and the setting of the two centrally symmetrically distributed clamping blocks 71 enable the two clamping blocks 71 to snap into the positioning grooves 611 with the same depth at the same time. Moreover, when the slider 6 rotates relative to the adjustment block 7, the cooperation directions of the inclined surfaces 711 on the two clamping blocks 71 and the guiding surfaces 6111 on the positioning grooves 611 are the same. Therefore, the slider 6 and the adjustment block 7 can rotate relative to each other in one direction, and the clamping block 71 can rotate and snap into the positioning grooves 611 with different depths as it rotates, so that the slider 6 approaches or moves away from the valve gasket 4, thereby changing the elastic force of the spring 5.

[0043] Embodiment 2

[0044] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the positioning groove group 61 is located on the adjusting block 7, and the convex block 71 is located on the slider 6. Its function is basically the same as that of the first embodiment.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A shock absorber with adjustable damping force, comprising a cylinder sleeve (1) and a connecting rod (2) inserted into the cylinder sleeve (1). A piston (3) is inserted through the connecting rod (2). A valve gasket (4) for slowing down the passage of hydraulic oil through the piston (3) is provided on one side of the piston (3). Characterized in that, A spring (5), a slider (6) and an adjusting block (7) are sequentially sleeved on the connecting rod (2). The slider (6) is circumferentially fixed to the connecting rod (2). Two ends of the spring (5) respectively abut against the valve gasket (4) and the slider (6). A blocking member (11) for blocking the adjusting block (7) is provided at the end of the connecting rod (2). The slider (6) abuts against the adjusting block (7) under the elastic force of the spring (5). A distance adjusting structure is provided on the slider (6) and the adjusting block (7). The distance adjusting structure changes the distance between the slider (6) and the valve gasket (4) by means of concave-convex insertion at different positions and realizes the relative rotation between the slider (6) and the adjusting block (7) by restricting the circumferential rotation of the adjusting block (7). The distance adjusting structure includes a supporting foot (72) located on the adjusting block (7). A limiting ring (8) is provided at the bottom of the cylinder sleeve (1). A groove (81) is opened on the inner side surface of the limiting ring (8). The adjusting block (7) is circumferentially positioned by the supporting foot (72) being snapped into the groove (81).

2. A shock absorber with adjustable damping force according to claim 1, Characterized in that, The distance adjusting structure includes a positioning groove group (61) opened on the slider (6) and a clamping block (71) located on the adjusting block (7). The positioning groove group (61) is composed of several positioning grooves (611) with gradually decreasing depths. The clamping block (71) changes the distance between the slider (6) and the valve gasket (4) by abutting against the bottoms of different positioning grooves (611).

3. A shock absorber with adjustable damping force according to claim 2, Characterized in that, The same-side groove walls of each positioning groove (611) are inclined guiding surfaces (6111). An inclined surface (711) cooperating with the guiding surface (6111) is provided on the clamping block (71).

4. A shock absorber with adjustable damping force according to claim 3, Characterized in that, There are two groups of positioning groove groups (61) on the slider (6) and they are symmetrically distributed about the center. There are also two clamping blocks (71) on the adjusting block (7) and they are symmetrically distributed about the center. The two clamping blocks (71) can be simultaneously snapped into the positioning grooves (611) with the same depth.

5. A shock absorber with adjustable damping force according to claim 1 or 2 or 3 or 4, Characterized in that, There are two grooves (81) on the limiting ring (8) and they are symmetrically distributed. The supporting feet (72) corresponding to the grooves (81) also have two.

6. A shock absorber with adjustable damping force according to claim 5, Characterized in that, A spring seat (9) is also slidably arranged between the valve gasket (4) and the spring (5) on the connecting rod (2). The spring (5) abuts against the spring seat (9) and the spring seat (9) abuts against the valve gasket (4) under the elastic force of the spring (5).

7. An adjustable damping shock absorber according to claim 5, characterized in that, a bushing (10) is sleeved on the connecting rod (2), and the slider (6) is sleeved outside the bushing (10) and is circumferentially fixed to the connecting rod (2) through the bushing (10).

8. An adjustable damping shock absorber according to claim 7, characterized in that, the blocking member (11) is a nut threadedly connected to the end of the connecting rod (2).

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