Shock absorber

Abstract

The utility model provides a shock absorber which comprises a first cylinder body and a second cylinder body, and the second cylinder body is arranged on the outer side of the first cylinder body in a sleeving mode. The piston assembly comprises a piston rod and a piston body, the piston rod is movably arranged on the first cylinder body, and the piston body is arranged on the piston rod and abuts against the inner wall of the first cylinder body so that the first cylinder body can be divided into an upper cylinder body and a lower cylinder body; the adjusting valve comprises a valve seat, a valve body and a valve element, the valve body is arranged on the valve seat, a first channel, a first cavity, a second cavity and a second channel which are sequentially communicated are formed in the valve body, the first channel is communicated with the lower cylinder body, the second channel is communicated with the second cylinder body, the valve element comprises a first circumferential part and a second circumferential part, the first circumferential part blocks the first cavity, and the second circumferential part blocks the second cavity. The second circumferential part blocks the second cavity, and the first circumferential part is used for deforming under the action of the first oil pressure of the first channel so that the first cavity can communicate with the second cavity. The adaptive capacity of the shock absorber to different scenes is improved.

Description

Technical Field

[0001] This application relates to the field of shock absorption device technology, specifically to a shock absorber. Background Technology

[0002] Vehicle shock absorbers are a key component of the suspension system. Their core function is to absorb road impact energy through hydraulic or pneumatic damping mechanisms, converting mechanical energy into heat energy for dissipation, thereby damping the continuous vibration of the springs and maintaining effective contact between the tires and the road surface. The performance of vehicle shock absorbers directly affects handling stability and ride comfort, and also impacts the lifespan of tires and chassis components.

[0003] Traditional shock absorbers use a fixed valve system design, which results in a relatively fixed damping force during compression and recovery strokes. They always work in a single mode and cannot dynamically adjust the fluid flow characteristics according to road conditions, making it difficult to balance the handling and comfort requirements in different scenarios. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this application provides a shock absorber.

[0005] The specific technical solution is as follows:

[0006] A shock absorber, comprising:

[0007] A first cylinder block and a second cylinder block, wherein the second cylinder block is fitted onto the outside of the first cylinder block;

[0008] A piston assembly includes a piston rod and a piston body, the piston rod being movably disposed on a first cylinder, and the piston body being disposed on the piston rod and abutting against the inner wall of the first cylinder to divide the first cylinder into an upper cylinder and a lower cylinder;

[0009] A regulating valve includes a valve seat, a valve body, and a valve core. The valve body is disposed on the valve seat and has a first channel, a first chamber, a second chamber, and a second channel that are connected in sequence. The first channel is connected to the lower cylinder, and the second channel is connected to the second cylinder. The valve core includes a first circumferential portion and a second circumferential portion. The first circumferential portion blocks the first chamber, and the second circumferential portion blocks the second chamber. The first circumferential portion is used to deform under the action of a first oil pressure in the first channel to make the first chamber and the second chamber connect.

[0010] In one embodiment, the inner wall of the second chamber protrudes outward to form an annular protrusion, the annular protrusion being close to the first chamber and located on the outer periphery of the first chamber;

[0011] The first circumferential portion contacts the annular protrusion to seal the first chamber, wherein the outer diameter of the first circumferential portion is larger than the outer diameter of the annular protrusion.

[0012] In one embodiment, the first circumferential portion includes a first sub-circumferential portion, a second sub-circumferential portion, a third sub-circumferential portion, and a fourth sub-circumferential portion arranged sequentially, wherein the first sub-circumferential portion contacts the annular protrusion.

[0013] Furthermore, the outer diameter of the first sub-circumferential portion is greater than the outer diameter of the annular protrusion, the outer diameters of the first sub-circumferential portion and the fourth sub-circumferential portion are equal, and the outer diameters of the second sub-circumferential portion, the third sub-circumferential portion and the fourth sub-circumferential portion increase sequentially.

[0014] In one embodiment, the valve seat is formed with a third chamber communicating with the second chamber, and the third chamber and the first chamber are located on opposite sides of the second chamber;

[0015] The valve core further includes an axial portion, and the first circumferential portion and the second circumferential portion are sequentially disposed on the axial portion. The third chamber is provided with a relief member, and the end of the axial portion away from the first circumferential portion abuts against the relief member. The axial portion is used to squeeze the relief member under the action of the second oil pressure of the first channel. The relief member is used to contract under the action of the axial portion to provide movement space for the axial portion. The second oil pressure is greater than the first oil pressure.

[0016] In one embodiment, the valve seat is provided with a third channel, which is connected to the third chamber and the second cylinder body respectively;

[0017] The third chamber is equipped with a limiting member, which is located on the side of the relief member away from the axial portion. The limiting member is used to drive the relief member and the valve core to move towards the first chamber under the action of the oil pressure in the third channel.

[0018] In one embodiment, the valve seat includes an outer valve seat, a middle valve seat, and an inner valve seat, wherein the middle valve seat and the inner valve seat are disposed within the outer valve seat; wherein the middle valve seat surrounds the outer side of the inner valve seat and is connected to the second cylinder body; the inner valve seat forms the third chamber, and one end of the inner valve seat having the third chamber is connected to the valve body;

[0019] The third channel includes sub-channel one, sub-channel two and sub-channel three. The middle valve seat is provided with sub-channel one. Sub-channel two is formed between the end of the middle valve seat, the end of the inner valve seat and the outer valve seat. The inner valve seat is provided with sub-channel three. Sub-channel one, sub-channel two and sub-channel three are connected in sequence.

[0020] In one embodiment, the first channel, the first chamber, and the second chamber are arranged sequentially along the axial direction of the regulating valve, and the inner diameters of the first channel, the first chamber, and the second chamber increase sequentially.

[0021] In one embodiment, there are multiple second channels, which are spaced circumferentially along the first channel.

[0022] In one embodiment, the yielding member includes an abutment and an elastic member, the axial portion abutting against the abutment, and the elastic member being located between the abutment and the bottom wall of the valve seat.

[0023] In one embodiment, the hardness of the elastic element is greater than the hardness of the first circumferential portion;

[0024] And / or, the stiffness coefficient of the elastic element is greater than the stiffness coefficient of the first circumferential portion.

[0025] In one embodiment, the shock absorber further includes a third cylinder located between the first cylinder and the second cylinder, the third cylinder communicating with the lower cylinder, and the valve body connected to the third cylinder to allow the first channel to communicate with the lower cylinder through the third cylinder.

[0026] This application has at least the following beneficial effects:

[0027] This application provides a shock absorber, comprising: a first cylinder and a second cylinder, the second cylinder being sleeved on the outside of the first cylinder; a piston assembly, comprising a piston rod and a piston body, the piston rod being movably disposed on the first cylinder, the piston body being disposed on the piston rod and abutting against the inner wall of the first cylinder to divide the first cylinder into an upper cylinder and a lower cylinder; and a regulating valve, comprising a valve seat, a valve body, and a valve core, the valve body being disposed on the valve seat, the valve body forming a first channel, a first chamber, a second chamber, and a second channel that are sequentially connected, the first channel communicating with the lower cylinder, the second channel communicating with the second cylinder, and the valve core comprising a first circumferential portion and a second circumferential portion, the first circumferential portion blocking the first chamber, the second circumferential portion blocking the second chamber, the first circumferential portion being deformed under the action of a first oil pressure in the first channel to make the first chamber and the second chamber connect.

[0028] The shock absorber provided in this application can connect the lower cylinder and the second cylinder through the first circumferential part of the regulating valve according to the oil pressure during the rebound stroke (i.e., the piston rod moves upward). This realizes intelligent adjustment of the hydraulic pressure according to changes in road conditions and driving status, achieves precise control of damping force, effectively buffers road impacts of different intensities, and has strong environmental adaptability and dynamic response. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the shock absorber provided in this embodiment. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the overall structure of the shock absorber provided in this embodiment. Figure 2 ;

[0032] Figure 3 for Figure 2 Cross-sectional view of line AA Figure 1 ;

[0033] Figure 4 for Figure 2 Cross-sectional view of line AA Figure 2

[0034] Figure 5 for Figure 4 Local magnification of region B Figure 1 ;

[0035] Figure 6 for Figure 4 Local magnification of region B Figure 2 ;

[0036] Figure 7 for Figure 5 A magnified view of a portion of region C in the middle;

[0037] Figure 8 for Figure 5 A magnified view of a portion of region D.

[0038] Figure label:

[0039] 1-First cylinder; 2-Second cylinder; 3-Piston assembly; 4-Regulating valve; 5-Third cylinder; 11-Upper cylinder; 12-Lower cylinder; 31-Piston rod; 32-Piston body; 41-Valve seat; 42-Valve body; 43-Valve core; 44-Relief element; 45-Limiting element; 411-Third chamber; 412-Third channel; 413-Outer valve seat; 414-Middle valve seat; 415-Inner valve seat; 421-First channel; 422- First chamber; 423-Second chamber; 424-Second channel; 431-First circumferential portion; 432-Second circumferential portion; 433-Axial portion; 441-Abutting member; 442-Elastic member; 4121-Sub-channel one; 4122-Sub-channel two; 4123-Sub-channel three; 4231-Annular protrusion; 4311-Sub-circumferential portion one; 4312-Sub-circumferential portion two; 4313-Sub-circumferential portion three; 4314-Sub-circumferential portion four. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] Traditional shock absorbers use a fixed valve system design, which results in a relatively fixed damping force during compression and recovery strokes. They always work in a single mode and cannot dynamically adjust the fluid flow characteristics according to road conditions, making it difficult to balance the handling and comfort requirements in different scenarios.

[0044] Based on this, this application provides a shock absorber, such as Figures 1 to 8As shown, it includes:

[0045] First cylinder 1 and second cylinder 2, the second cylinder 2 being fitted onto the outside of the first cylinder 1;

[0046] The piston assembly 3 includes a piston rod 31 and a piston body 32. The piston rod 31 is movably disposed on the first cylinder 1, and the piston body 32 is disposed on the piston rod 31 and abuts against the inner wall of the first cylinder 1 to divide the first cylinder 1 into an upper cylinder 11 and a lower cylinder 12.

[0047] The regulating valve 4 includes a valve seat 41, a valve body 42, and a valve core 43. The valve body 42 is disposed on the valve seat 41 and forms a first channel 421, a first chamber 422, a second chamber 423, and a second channel 424 that are connected in sequence. The first channel 421 is connected to the lower cylinder 12, and the second channel 424 is connected to the second cylinder 2. The valve core 43 includes a first circumferential portion 431 and a second circumferential portion 432. The first circumferential portion 431 blocks the first chamber 422, and the second circumferential portion 432 blocks the second chamber 423. The first circumferential portion 431 is used to deform under the first oil pressure of the first channel 421 so that the first chamber 422 and the second chamber 423 are connected.

[0048] The shock absorber provided in this embodiment can connect the lower cylinder 12 and the second cylinder 2 through the first circumferential part 431 of the regulating valve 4 according to the oil pressure during the rebound stroke (i.e., the piston rod moves up). This realizes intelligent adjustment of the oil pressure according to changes in road conditions and driving status, achieves precise control of damping force, effectively buffers road impacts of different intensities, and has strong environmental adaptability and dynamic response.

[0049] Specifically, the first oil pressure is not a pressure value, but a specific pressure range.

[0050] like Figure 4 As shown, in one embodiment, the shock absorber further includes a third cylinder 5, which is located between the first cylinder 1 and the second cylinder 2. The third cylinder 5 is connected to the lower cylinder 12, and the valve body 42 is connected to the third cylinder 5 so that the first channel 421 is connected to the lower cylinder 12 through the third cylinder 5.

[0051] This embodiment improves the damping adjustment effect by adding a third cylinder 5 to increase the movement path of the oil.

[0052] like Figure 6 As shown, in one embodiment, the first channel 421, the first chamber 422, and the second chamber 423 are arranged sequentially along the axial direction of the regulating valve 4, and the inner diameters of the first channel 421, the first chamber 422, and the second chamber 423 increase sequentially.

[0053] In this embodiment, the inner diameters of the first channel 421, the first chamber 422, and the second chamber 423 of the regulating valve 4 increase sequentially, forming a pressure buffer step. When the piston rod 31 moves and generates high pressure, the oil first passes through the narrow-diameter first channel 421 (high-pressure zone), then enters the expanded-diameter first chamber 422 to achieve pressure relief, and finally completes secondary pressure attenuation in the second chamber 423. This embodiment achieves near-linear output of damping force through graded pressure control, avoiding sudden changes in force value.

[0054] In one embodiment, there are multiple second channels 424, which are spaced apart circumferentially along the first channel 421.

[0055] This embodiment enables the oil flowing out of the second chamber 423 to diffuse into the second cylinder 2 in a 360° annular pattern, which can avoid the liquid flow impact bias caused by a single second channel 424. This embodiment helps to improve the uniformity of oil pressure distribution in the second cylinder 2 and significantly reduce the risk of cavitation and vibration noise caused by pressure concentration.

[0056] like Figure 6 and Figure 7 As shown, in one embodiment, the inner wall of the second chamber 423 protrudes outward to form an annular protrusion 4231, which is close to the first chamber 422 and located on the outer periphery of the first chamber 422.

[0057] The first circumferential portion 431 contacts the annular protrusion 4231 to seal the first chamber 422, wherein the outer diameter of the first circumferential portion 431 is larger than the outer diameter of the annular protrusion 4231.

[0058] In this embodiment, the outer diameter of the first circumferential portion 431 is larger than that of the annular protrusion 4231, so that when the first circumferential portion 431 blocks the first chamber 422, it forms an interference fit seal. When the oil pressure on the first circumferential portion 431 is less than the first oil pressure, its elastic deformation can be effectively constrained by the outer edge of the protrusion; when the oil pressure on the first circumferential portion 431 is greater than or equal to the first oil pressure, its elastic deformation is not constrained by the outer edge of the protrusion. This embodiment enables the regulating valve 4 to precisely adjust the oil flow rate based on the oil pressure, achieving precise control of the damping force.

[0059] like Figure 7 As shown, in one embodiment, the first circumferential portion 431 includes a first circumferential portion 4311, a second circumferential portion 4312, a third circumferential portion 4313 and a fourth circumferential portion 4314 arranged sequentially, wherein the first circumferential portion 4311 contacts the annular protrusion 4231.

[0060] Furthermore, the outer diameter of the first sub-circumferential part 4311 is greater than the outer diameter of the annular protrusion 4231, the outer diameters of the first sub-circumferential part 4311 and the fourth sub-circumferential part 4314 are equal, and the outer diameters of the second sub-circumferential part 4312, the third sub-circumferential part 4313 and the fourth sub-circumferential part 4314 increase sequentially.

[0061] In one embodiment, the number of sub-circumferential portions 4311 is two or more.

[0062] In this embodiment, the first circumferential portion 431 is composed of four sub-circumferential portions, which form a support system. When the first sub-circumferential portion 4311 is subjected to radial force (i.e., the oil pressure in the first channel 421), the second sub-circumferential portion 4312, the third sub-circumferential portion 4313, and the fourth sub-circumferential portion 4314 serve as auxiliary supports in sequence, thereby improving the radial stiffness of the valve core 43.

[0063] Furthermore, the outer diameters of the second circumferential section 4312, the third circumferential section 4313, and the fourth circumferential section 4314 increase sequentially, forming a three-stage pressure buffer ladder. When the high-pressure oil in the first channel 421 enters, the oil pressure is decomposed into four stages for release, improving the opening accuracy of the first circumferential section 431.

[0064] like Figure 4 , Figure 5 and Figure 8 As shown, in one embodiment, the valve seat 41 is formed with a third chamber 411 communicating with the second chamber 423, and the third chamber 411 and the first chamber 422 are respectively disposed on both sides of the second chamber 423.

[0065] The valve core 43 also includes an axial portion 433, a first circumferential portion 431 and a second circumferential portion 432 are sequentially arranged on the axial portion 433, and a third chamber 411 is provided with a relief member 44. The end of the axial portion 433 away from the first circumferential portion 431 abuts against the relief member 44. The axial portion 433 is used to squeeze the relief member 44 under the action of the second oil pressure of the first channel 421. The relief member 44 is used to contract under the action of the axial portion 433 to provide movement space for the axial portion 433, wherein the second oil pressure is greater than the first oil pressure.

[0066] Specifically, the second oil pressure is not a pressure value, but a specific pressure range.

[0067] In this embodiment, when the oil pressure in the first channel 421 is less than the first oil pressure, the first circumferential part 431 achieves basic sealing through the annular protrusion 4231, providing linear damping characteristics for daily operation. At this time, the clearance member 44 is in its original position, and the axial part 433 has no displacement.

[0068] When the oil pressure in the first channel 421 is the first oil pressure, the first circumferential part 431 deforms to make the first chamber 422 and the second chamber 423 conduct to form a secondary damping, which is suitable for medium impact conditions.

[0069] When the oil pressure in the first channel 421 reaches the second oil pressure, the axial part 433 compresses the relief member 44, causing it to contract and increasing the conductivity between the first chamber 422 and the second chamber 423, thus forming a three-stage damping. This effectively absorbs extreme impact energy and prevents overload of the suspension system.

[0070] like Figure 8 As shown, in one embodiment, the yielding member 44 includes an abutment member 441 and an elastic member 442. The axial portion 433 abuts against the abutment member 441, and the elastic member 442 is located between the abutment member 441 and the bottom wall of the valve seat 41. Specifically, the end of the axial portion 433 that contacts the abutment member 441 is stepped, and a corresponding through hole is provided on the abutment member 441. The stepped end of the axial portion 433 extends into the through hole and abuts against the abutment member 441. This embodiment makes the abutment relationship between the axial portion 433 and the abutment member 441 stable.

[0071] Specifically, the elastic element 442 is an elastic ring.

[0072] In one embodiment, the hardness of the elastic element 442 is greater than the hardness of the first circumferential portion 431.

[0073] In one embodiment, the stiffness coefficient of the elastic member 442 is greater than the stiffness coefficient of the first circumferential portion 431.

[0074] like Figure 8 As shown, in one embodiment, the valve seat 41 is provided with a third channel 412, which is connected to the third chamber 411 and the second cylinder 2 respectively;

[0075] The third chamber 411 is equipped with a limiting member 45, which is located on the side of the relief member 44 away from the axial portion 433. The limiting member 45 is used to drive the relief member 44 and the valve core 43 to move towards the first chamber 422 under the action of the oil pressure of the third channel 412.

[0076] When the retracting member 44 retracts to provide a larger moving space for the axial part 433, the degree of communication between the first chamber 422 and the second chamber 423 is large, which will lead to excessive oil flow, resulting in an abnormal increase in the internal pressure of the regulating valve 4, damaging the damping characteristics of the regulating valve 4, and thus preventing energy from being effectively absorbed.

[0077] Therefore, in this embodiment, by using the cooperation of the limiting member 45 and the third channel 412, the oil pressure in the third channel 412 is used to limit the movement of the axial part 433, thereby preventing the excessive oil flow of the regulating valve 4, ensuring the normal use of the regulating valve 4, and improving the stability of the regulating valve 4.

[0078] like Figure 8 As shown, in one embodiment, the valve seat 41 includes an outer valve seat 413, a middle valve seat 414, and an inner valve seat 415. The middle valve seat 414 and the inner valve seat 415 are disposed inside the outer valve seat 413. The middle valve seat 414 surrounds the outer side of the inner valve seat 415 and is connected to the second cylinder 2. The inner valve seat 415 forms a third chamber 411, and one end of the inner valve seat 415 with the third chamber 411 is connected to the valve body 42.

[0079] The third channel 412 includes sub-channel one 4121, sub-channel two 4122 and sub-channel three 4123. Sub-channel one 4121 is provided in the middle valve seat 414. Sub-channel two 4122 is formed between the end of the middle valve seat 414, the end of the inner valve seat 415 and the outer valve seat 413. Sub-channel three 4123 is provided in the inner valve seat 415. Sub-channel one 4121, sub-channel two 4122 and sub-channel three 4123 are connected in sequence.

[0080] In this embodiment, the valve seat 41 is divided into an outer valve seat 413, a middle valve seat 414, and an inner valve seat 415, which facilitates production and installation and reduces assembly difficulty; at the same time, the outer valve seat 413, the middle valve seat 414, and the inner valve seat 415 are used together to form a third channel 412, which reduces the processing difficulty.

[0081] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

[0082] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A shock absorber, characterized in that, include: A first cylinder block and a second cylinder block, wherein the second cylinder block is fitted onto the outside of the first cylinder block; A piston assembly includes a piston rod and a piston body, the piston rod being movably disposed on a first cylinder, and the piston body being disposed on the piston rod and abutting against the inner wall of the first cylinder to divide the first cylinder into an upper cylinder and a lower cylinder; A regulating valve includes a valve seat, a valve body, and a valve core. The valve body is disposed on the valve seat and has a first channel, a first chamber, a second chamber, and a second channel that are connected in sequence. The first channel is connected to the lower cylinder, and the second channel is connected to the second cylinder. The valve core includes a first circumferential portion and a second circumferential portion. The first circumferential portion blocks the first chamber, and the second circumferential portion blocks the second chamber. The first circumferential portion is used to deform under the action of a first oil pressure in the first channel to make the first chamber and the second chamber connect.

2. The shock absorber according to claim 1, characterized in that, The inner wall of the second chamber protrudes outward to form an annular protrusion, which is close to the first chamber and located on the outer periphery of the first chamber. The first circumferential portion contacts the annular protrusion to seal the first chamber, wherein the outer diameter of the first circumferential portion is larger than the outer diameter of the annular protrusion.

3. The shock absorber according to claim 2, characterized in that, The first circumferential portion includes a first sub-circumferential portion, a second sub-circumferential portion, a third sub-circumferential portion, and a fourth sub-circumferential portion arranged sequentially, wherein the first sub-circumferential portion is in contact with the annular protrusion. Furthermore, the outer diameter of the first sub-circumferential portion is greater than the outer diameter of the annular protrusion, the outer diameters of the first sub-circumferential portion and the fourth sub-circumferential portion are equal, and the outer diameters of the second sub-circumferential portion, the third sub-circumferential portion and the fourth sub-circumferential portion increase sequentially.

4. The shock absorber according to claim 1, characterized in that, The valve seat has a third chamber that communicates with the second chamber, and the third chamber and the first chamber are located on opposite sides of the second chamber. The valve core further includes an axial portion, and the first circumferential portion and the second circumferential portion are sequentially disposed on the axial portion. The third chamber is provided with a relief member, and the end of the axial portion away from the first circumferential portion abuts against the relief member. The axial portion is used to squeeze the relief member under the action of the second oil pressure of the first channel. The relief member is used to contract under the action of the axial portion to provide movement space for the axial portion. The second oil pressure is greater than the first oil pressure.

5. The shock absorber according to claim 4, characterized in that, The valve seat is provided with a third channel, which is connected to the third chamber and the second cylinder body respectively; The third chamber is equipped with a limiting member, which is located on the side of the relief member away from the axial portion. The limiting member is used to drive the relief member and the valve core to move towards the first chamber under the action of the oil pressure in the third channel.

6. The shock absorber according to claim 5, characterized in that, The valve seat includes an outer valve seat, a middle valve seat, and an inner valve seat. The middle valve seat and the inner valve seat are disposed inside the outer valve seat. The middle valve seat surrounds the outer side of the inner valve seat and is connected to the second cylinder body. The inner valve seat forms the third chamber, and one end of the inner valve seat with the third chamber is connected to the valve body. The third channel includes sub-channel one, sub-channel two and sub-channel three. The middle valve seat is provided with sub-channel one. Sub-channel two is formed between the end of the middle valve seat, the end of the inner valve seat and the outer valve seat. The inner valve seat is provided with sub-channel three. Sub-channel one, sub-channel two and sub-channel three are connected in sequence.

7. The shock absorber according to claim 1, characterized in that, The first channel, the first chamber, and the second chamber are arranged sequentially along the axial direction of the regulating valve, and the inner diameters of the first channel, the first chamber, and the second chamber increase sequentially.

8. The shock absorber according to claim 4, characterized in that, The clearance member includes an abutment member and an elastic member. The axial portion abuts against the abutment member, and the elastic member is located between the abutment member and the bottom wall of the valve seat.

9. The shock absorber according to claim 8, characterized in that, The hardness of the elastic element is greater than the hardness of the first circumferential portion; And / or, the stiffness coefficient of the elastic element is greater than the stiffness coefficient of the first circumferential portion.

10. The shock absorber according to claim 1, characterized in that, The shock absorber also includes a third cylinder, which is located between the first cylinder and the second cylinder and is connected to the lower cylinder. The valve body is connected to the third cylinder so that the first channel is connected to the lower cylinder through the third cylinder.

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