Shock absorber and assembly method thereof
By using the design of movable limit assembly and limit slots in the vibration damper, the problems of assembly complexity and seal failure are solved, and the effect of simplifying assembly and improving seal reliability is achieved.
Patent Information
- Application Number
- CN202410104031.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2025-07-25
AI Technical Summary
The assembly process of existing shock absorbers is complicated, the processing of limiting parts is difficult and easy to cause interference in parts, and the risk of seal failure is high.
The movable limit assembly and limit slot design is adopted. The movable limit assembly can be moved in the axis direction of the working cylinder, and cooperates with the limit slot through the barrier member to simplify the assembly process, reduce the risk of parts interference, and improve seal reliability.
The assembly steps of the vibration damper are simplified, processing costs are reduced, seal failure risk is reduced, and the limit reliability of the seal is improved, making it easy to repair and maintenance.
Smart Images
Figure CN120367978A_ABST
Abstract
Description
Technical Field
[0001] At least one embodiment of the present disclosure relates to a shock absorber and an assembly method thereof. Background Art
[0002] During the driving of a vehicle, the suspension system vibrates due to the impact on the elastic element, and the shock absorber can accelerate the attenuation of the vibration of the vehicle frame and body, thereby improving the ride smoothness of the vehicle. Summary of the Invention
[0003] At least one embodiment of the present disclosure provides a shock absorber, which includes a working cylinder, a storage cylinder, an intermediate cylinder, and a plurality of sealing assemblies. The storage cylinder is sleeved outside the working cylinder, the intermediate cylinder is located between the storage cylinder and the working cylinder, and each of the sealing assemblies includes a seal and a limiting assembly. The seal is disposed between the intermediate cylinder and the working cylinder. Among them, the limiting assembly includes a movable limiting assembly, a limiting groove, and a blocking member. The movable limiting assembly is sleeved outside the working cylinder and is movable in the axial direction of the working cylinder. The limiting groove is located on the side of the working cylinder facing the intermediate cylinder. Among them, the movable limiting assembly is configured to limit the seal, and the blocking member is partially located in the limiting groove and is configured to block the movable limiting assembly.
[0004] For example, according to at least one embodiment of the present disclosure, the shape of the movable limiting assembly on a reference plane perpendicular to the axial direction includes a ring shape, and the shape of the blocking member on the reference plane is a ring shape with a notch.
[0005] For example, according to at least one embodiment of the present disclosure, the movable limiting assembly includes a first movable limiting member and a second movable limiting member that are spaced apart along the axial direction of the working cylinder. The seal is located between the first movable limiting member and the second movable limiting member. The limiting groove includes a first limiting groove and a second limiting groove that are spaced apart along the axial direction of the working cylinder. The blocking member includes a first blocking member and a second blocking member. The first blocking member is partially located in the first limiting groove and is configured to block the first movable limiting member. The second blocking member is partially located in the second limiting groove and is configured to block the second movable limiting member.
[0006] For example, according to at least one embodiment of the present disclosure, the working cylinder includes a working chamber, an intermediate chamber is formed between the working cylinder and the intermediate cylinder, and an oil storage chamber is formed between the intermediate cylinder and the storage cylinder; the working cylinder includes a first opening, and the intermediate cylinder includes a second opening; the first opening and the second opening are configured to allow fluid to flow between the working chamber, the intermediate chamber, and the oil storage chamber.
[0007] For example, according to at least one embodiment of the present disclosure, the plurality of sealing components include a first end sealing component and a second end sealing component that are spaced apart along the axial direction; in a plane parallel to the axial direction, the orthographic projections of the first opening and the second opening are both located between the orthographic projections of the first end sealing component and the second end sealing component.
[0008] For example, according to at least one embodiment of the present disclosure, the plurality of sealing components further include an intermediate sealing component located between the first end sealing component and the second end sealing component; the first opening is provided in plurality, and the second opening is provided in plurality; in a plane parallel to the axial direction, the orthographic projection of the intermediate sealing component is located between the orthographic projections of two adjacent second openings, and the orthographic projection of the intermediate sealing component is located between the orthographic projections of two adjacent first openings.
[0009] For example, according to at least one embodiment of the present disclosure, in a plane parallel to the axial direction, the orthographic projection of the blocking member overlaps with the orthographic projection of the movable limiting component.
[0010] For example, according to at least one embodiment of the present disclosure, in a direction perpendicular to the axial direction, the size of the side of the movable limiting component close to the sealing member is greater than the size of the side of the movable limiting component away from the sealing member.
[0011] For example, according to at least one embodiment of the present disclosure, the first movable limiting member and the second movable limiting member respectively include a first part and a second part connected to each other; the first part is configured to limit the sealing member; in a direction perpendicular to the axial direction, the size of the second part gradually decreases from the side close to the first part to the side away from the first part.
[0012] For example, according to at least one embodiment of the present disclosure, the surface of the second part close to the intermediate cylinder includes an inclined surface or a circular arc surface.
[0013] For example, according to at least one embodiment of the present disclosure, a receiving space is formed between one end of the second part away from the first part and the intermediate cylinder; the receiving space is configured to receive the blocking member.
[0014] For example, according to at least one embodiment of the present disclosure, the maximum dimension between the side of the movable limiting component away from the sealing member and the surface of the working cylinder facing each other is a first dimension, and the maximum dimension of the blocking member in a direction perpendicular to the axial direction is a second dimension; the ratio of the first dimension to the second dimension is 1 / 3 to 2 / 3.
[0015] For example, according to at least one embodiment of the present disclosure, in a direction perpendicular to the axial direction, the ratio of the maximum dimension of the limiting groove to the maximum dimension of the blocking member is 1 / 3 to 2 / 3.
[0016] For example, according to at least one embodiment of the present disclosure, there is a gap between the movable limiting assembly and the intermediate cylinder.
[0017] At least one embodiment of the present disclosure provides an assembly method for a shock absorber. The method includes: sleeving a first end seal assembly at one end of a working cylinder; sleeving the first end of an intermediate cylinder on a side of the first end seal assembly away from the working cylinder; sleeving a second end seal assembly at the other end of the working cylinder; and moving the intermediate cylinder along the axial direction of the working cylinder so that the first end of the intermediate cylinder is sleeved on a side of the second end seal assembly away from the working cylinder, and the second end of the intermediate cylinder is sleeved on a side of the first end seal assembly away from the working cylinder. Wherein, each of the first end seal assembly and the second end seal assembly includes: a movable limiting assembly sleeved outside the working cylinder and movable in the axial direction of the working cylinder; a limiting groove located on a side of the working cylinder facing the intermediate cylinder; and a blocking member. Wherein, the movable limiting assembly is configured to limit the seal member, and the blocking member is partially located in the limiting groove and is configured to block the movable limiting assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure.
[0019] Figure 1A It is a cross-sectional schematic diagram of a shock absorber provided by an example in at least one embodiment of the present disclosure.
[0020] Figure 1B and Figure 1C is Figure 1A a partial enlarged schematic diagram at A in
[0021] Figure 1D is Figure 1A a partial enlarged schematic diagram at B in
[0022] Figure 2 It is a cross-sectional schematic diagram of a shock absorber provided by an example in at least one embodiment of the present disclosure.
[0023] Figure 3A It is a cross-sectional schematic diagram of a shock absorber provided by an example in at least one embodiment of the present disclosure.
[0024] Figure 3B isFigure 3A Partial enlarged schematic view at position C in the [Chinese context]. Specific implementation manners
[0025] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.
[0026] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items.
[0027] The features such as "vertical", "parallel" and "same" used in the present disclosure include the strict meanings of "vertical", "parallel", "same", etc., as well as the cases with certain errors such as "substantially vertical", "substantially parallel", "substantially same", etc. Considering the measurement and the errors associated with the measurement of a specific quantity (i.e., the limitations of the measurement system), it means within the acceptable deviation range for a specific value determined by those of ordinary skill in the art. The "center" in the embodiments of the present disclosure may include the position strictly located at the geometric center and the position of the approximate center within a small area around the geometric center. For example, "substantially" can mean within one or more standard deviations, or within 10% or 5% of the value.
[0028] A shock absorber is a device used to reduce the vibration of a mechanical system. The shock absorber mainly reduces the vibration of the mechanical system by absorbing and dissipating energy, thereby improving the stability, reliability and comfort of the system. For example, in the suspension system of a vehicle, the hydraulic fluid inside the shock absorber will flow according to the movement of the piston, thereby reducing the vibration generated by the bumpy road surface or the movement of the suspension system during driving, providing a smooth driving experience for the driver and passengers, and improving the handling performance of the vehicle.
[0029] During the compression stroke of the shock absorber, the piston in the working cylinder moves towards the compression valve to compress the hydraulic fluid, and the hydraulic fluid in the working cylinder flows towards the oil storage cylinder. During the extension stroke of the shock absorber, the piston in the working cylinder moves away from the compression valve, enabling the hydraulic fluid to flow from the oil storage cylinder into the working cylinder. To make the damping of the shock absorber adjustable, the shock absorber is also provided with a solenoid valve communicated with the oil storage cylinder, and the flow rate of the hydraulic fluid is controlled by the solenoid valve, thereby controlling the damping force of the shock absorber.
[0030] In the research, the inventors of the present application found that the assembly process of the shock absorber is relatively complex. During the assembly of the shock absorber, it is usually necessary to install a seal to achieve the sealing of the shock absorber. At the same time, a limiting component is required to limit the seal to improve the sealing effect of the shock absorber. However, the processing process of some limiting components is relatively complex, and the installation of some other limiting components is more difficult.
[0031] For example, when fixing the limiting component on the working cylinder or on the intermediate cylinder between the oil storage cylinder and the working cylinder, the fixing of the limiting component can be achieved through a welding process or an adhesive process, and the process is relatively complex. In addition, during the assembly process of the limiting component and the seal, there may also be interference between components, making it difficult to install. For example, a convex portion can be machined on the inner wall of the intermediate cylinder, and the convex portion is used as the limiting component to limit the seal. However, it is difficult to guarantee the machining accuracy of this method, and the machining process is complex, and there is a greater risk of seal failure between the intermediate cylinder and the working cylinder. In addition, when manufacturing the intermediate cylinder, a convex portion can be formed through a mold, but this method requires a special mold and has a low processing efficiency. For example, through a vulcanization process, a limiting component made of silica gel material is bonded to the intermediate cylinder, and the flexible limiting component is used to limit the sealing ring. However, there is a greater risk of seal failure at the connection between the intermediate cylinder and the limiting component, and an additional vulcanization process is required.
[0032] At least one embodiment of the present disclosure provides a shock absorber, which includes a working cylinder, an oil storage cylinder, an intermediate cylinder, and a plurality of seal assemblies. The oil storage cylinder is sleeved outside the working cylinder, the intermediate cylinder is located between the oil storage cylinder and the working cylinder, and each seal assembly includes a seal and a limiting assembly. The seal is arranged between the intermediate cylinder and the working cylinder. Among them, the limiting assembly includes a movable limiting assembly, a limiting groove, and a blocking member. The movable limiting assembly is sleeved outside the working cylinder and is movable in the axial direction of the working cylinder. The limiting groove is located on the side of the working cylinder facing the intermediate cylinder. Among them, the movable limiting assembly is configured to limit the seal, and the blocking member is partially located in the limiting groove and is configured to block the movable limiting assembly.
[0033] The shock absorber provided by at least one embodiment of the present disclosure can be relatively easily installed on the working cylinder and limit the seal since the movable limiting component is movable in the axial direction of the working cylinder and can limit the seal. At the same time, by providing the limiting groove in cooperation with the blocking member, the movable limiting component can be blocked, so that the limitation of the seal is more reliable. Moreover, since the movable limiting component is blocked by the blocking member and limits the seal, there is no need to additionally add processes such as welding process, bonding process or vulcanization process to fix the movable limiting component, and at the same time, the risk of interference between parts during the installation of parts is reduced. At the same time, since the shock absorber provided by the embodiment of the present disclosure does not require additional processing processes and only requires the assembly of parts, on the one hand, the assembly steps of the shock absorber are simplified and the processing cost is reduced, and on the other hand, it is also convenient for subsequent maintenance and repair of the shock absorber. In addition, the seal directly seals between the working cylinder and the intermediate cylinder, without adding more part connection relationships, thereby reducing the risk of seal failure at the joints of other parts.
[0034] At least one embodiment of the present disclosure provides an assembly method of a shock absorber. The method includes: sleeving a first end seal assembly on one end of the working cylinder; sleeving the first end of the intermediate cylinder on the side of the first end seal assembly away from the working cylinder; sleeving a second end seal assembly on the other end of the working cylinder; and moving the intermediate cylinder along the axial direction of the working cylinder so that the first end of the intermediate cylinder is sleeved on the side of the second end seal assembly away from the working cylinder, and the second end of the intermediate cylinder is sleeved on the side of the first end seal assembly away from the working cylinder; wherein each of the first end seal assembly and the second end seal assembly includes: a movable limiting component, sleeved outside the working cylinder and movable in the axial direction of the working cylinder; a limiting groove, located on the side of the working cylinder facing the intermediate cylinder; and a blocking member, wherein the movable limiting component is configured to limit the seal, and a part of the blocking member is located in the limiting groove and is configured to block the movable limiting component.
[0035] For the assembly method of the shock absorber provided by at least one embodiment of the present disclosure, after sleeving the first end seal assembly, the intermediate cylinder and the second end seal assembly, by moving the intermediate cylinder, the first end seal assembly and the second seal assembly are sealed between the intermediate cylinder and the working cylinder, and the assembly of the intermediate cylinder and the working cylinder can be relatively easily realized.
[0036] The shock absorber and its assembly method will be described below with reference to the drawings and through some embodiments.
[0037] Figure 1A It is a cross-sectional schematic view of the shock absorber provided by an example in at least one embodiment of the present disclosure. Figure 1B and Figure 1C is Figure 1A a partial enlarged schematic view of part A in Figure 1D is Figure 1APartial enlarged schematic diagram at position B in the middle.
[0038] Reference Figures 1A to 1C , the shock absorber includes a working cylinder 100, a storage cylinder 200, an intermediate cylinder 300, and a plurality of sealing assemblies 400. The storage cylinder 200 is sleeved outside the working cylinder 100, and the intermediate cylinder 300 is located between the storage cylinder 200 and the working cylinder 100. For example, the working cylinder 100, the intermediate cylinder 300, and the storage cylinder 200 are coaxially arranged.
[0039] Reference Figure 1A and Figure 1B , each sealing assembly 400 includes a seal 410 and a limiting assembly 420. The seal 410 is arranged between the intermediate cylinder 300 and the working cylinder 100. For example, the seal 410 can be an O-ring. The seal 410 arranged between the intermediate cylinder 300 and the working cylinder 100 can undergo elastic deformation and be pressed by the intermediate cylinder 300 and the working cylinder 100, so as to have excellent sealing effect.
[0040] Reference Figure 1A and Figure 1B , the limiting assembly 420 includes a movable limiting assembly 421, a limiting groove 422, and a blocking member 423. The movable limiting assembly 421 is sleeved outside the working cylinder 100 and is movable in the axial direction X of the working cylinder 100. For example, the inner diameter of the movable limiting assembly 421 can be substantially the same as the outer diameter of the working cylinder 100. During assembly, the movable limiting assembly 421 can be sleeved on the working cylinder 100 by lubricating with lubricating oil.
[0041] Reference Figure 1A and Figure 1B , the limiting groove 422 is located on the side of the working cylinder 100 facing the intermediate cylinder 300. For example, the limiting groove 422 can be located on the outer peripheral wall of the working cylinder 100. The movable limiting assembly 421 is configured to limit the seal 410, and the blocking member 423 is partially located in the limiting groove 422 and is configured to block the movable limiting assembly 421. For example, the blocking member 423 partially abuts against the movable limiting assembly 421 to block the movable limiting assembly 421.
[0042] In a shock absorber provided in an embodiment of the present disclosure, since the movable limiting component 421 is movable in the axial direction X of the working cylinder 100, it can be relatively easily installed on the working cylinder 100 and limit the seal 410. At the same time, by providing the cooperation of the limiting groove 422 and the blocking member 423, the movable limiting component 421 can be blocked, so that the limitation of the seal 410 is more reliable. Moreover, since the movable limiting component 421 is blocked by the blocking member 423 and limits the seal 410, there is no need to additionally add processes such as welding process, bonding process or vulcanization process to fix the movable limiting component 421, and at the same time, the risk of interference between parts during the installation of parts is reduced. At the same time, since the shock absorber provided in the embodiment of the present disclosure does not require additional processing techniques and only requires the assembly of parts, on the one hand, the assembly steps of the shock absorber are simplified and the processing cost is reduced, and on the other hand, it is also convenient for subsequent maintenance and repair of the shock absorber. In addition, the seal 410 is directly sealed between the working cylinder 100 and the intermediate cylinder 300, without adding more part connection relationships, thereby reducing the risk of seal failure at the joints of other parts.
[0043] Reference Figure 1A And Figure 1B , in some examples, there may be a gap between the movable limiting component 421 and the intermediate cylinder 300. When assembling the shock absorber, by setting the gap between the movable limiting component 421 and the intermediate cylinder 300, the friction between the movable limiting component 421 and the intermediate cylinder 300 can be reduced. For example, the movable limiting component 421 and the intermediate cylinder 300 may be in clearance fit.
[0044] Reference Figure 1A And Figure 1B , in some examples, the shape of the movable limiting component 421 on a reference plane perpendicular to the axial direction X includes a ring shape (not shown in the figure). For example, at least a part of the movable limiting component 421 can surround the working cylinder 100. The shape of the blocking member 423 on the reference plane is a ring shape with a notch (not shown in the figure). For example, the blocking member 423 is a discontinuous structure. For example, the blocking member 423 includes two ends facing each other, and a notch is formed between the two ends. For example, the blocking member 423 has elasticity, and the size of the notch can be adjusted to make it easier for the blocking member 423 to be sleeved on the working cylinder 100. When the blocking member 423 moves to the limiting groove 422, it can be stuck in the limiting groove 422 (i.e., partially located in the limiting groove).
[0045] Reference Figure 1A And Figure 1B, for example, the radial dimension of the part of the working cylinder 100 where the limiting groove 422 is formed is smaller than the radial dimension of other parts of the working cylinder 100. In order to enable part of the blocking member 423 to be located in the limiting groove 422, the inner diameter dimension of the blocking member 423 is smaller than the radial dimension of other parts of the working cylinder 100. By adjusting and increasing the notch dimension of the blocking member 423, the inner diameter dimension of the blocking member 423 can be made larger than or equal to the radial dimension of other parts of the working cylinder 100, so as to sleeved the blocking member 423 on the working cylinder 100. At the same time, after the blocking member 423 reaches the limiting groove 422, by adjusting and reducing the notch dimension of the blocking member 423, the blocking member 423 can be reliably limited in the limiting groove 422. For example, the blocking member 423 can be a snap ring or a circlip.
[0046] Reference Figure 1A and Figure 1B , in some examples, on a plane parallel to the axial direction X, the orthographic projection of the blocking member 423 overlaps with the orthographic projection of the movable limiting assembly 421, so that the movable limiting assembly 421 can limit the blocking member 423 in the radial direction of the working cylinder 100, thereby preventing the blocking member 423 from jumping out. For example, the plane parallel to the axial direction X can be perpendicular to the reference plane. For example, in the axial direction X, the dimension of the movable limiting assembly 421 is larger than the dimension of the blocking member 423. For example, on a plane parallel to the axial direction X, the orthographic projection of the blocking member 423 is located in the orthographic projection of the movable limiting assembly 421, so that the movable limiting assembly 421 can limit a larger area of the blocking member 423, improving the limiting effect.
[0047] Reference Figure 1A and Figure 1B , for example, on a plane parallel to the axial direction X, the orthographic projection of the limiting groove 422 overlaps with the orthographic projection of the movable limiting assembly 421. For example, on a plane parallel to the axial direction X, the orthographic projection of the limiting groove 422 is located in the orthographic projection of the movable limiting assembly 421.
[0048] Reference Figure 1A and Figure 1B , in some examples, the movable limiting assembly 421 includes a first movable limiting member 4211 and a second movable limiting member 4212 that are arranged at intervals along the axial direction X of the working cylinder 100, and the seal 410 is located between the first movable limiting member 4211 and the second movable limiting member 4212 to limit the seal 410 in the axial direction X through the first movable limiting member 4211 and the second movable limiting member 4212. For example, the seal 410 abuts between the first movable limiting member 4211 and the second movable limiting member 4212.
[0049] Reference Figure 1A and Figure 1B, the limiting groove 422 includes a first limiting groove 4221 and a second limiting groove 4222 arranged at intervals along the axial direction X of the working cylinder 100. The blocking member 423 includes a first blocking member 4231 and a second blocking member 4232. The first blocking member 4231 is partially located in the first limiting groove 4221 and is configured to block the first movable limiting member 4211. The second blocking member 4232 is partially located in the second limiting groove 4222 and is configured to block the second movable limiting member 4212. For example, the first movable limiting member 4211 is located on the side of the first limiting groove 4221 close to the seal 410, and the second movable limiting member 4212 is located on the side of the second limiting groove 4222 close to the seal 410. The first limiting groove 4221 limits the first blocking member 4231 so that the first blocking member 4231 can reliably block the first movable limiting member 4211. The second limiting groove 4222 limits the second blocking member 4232 so that the second blocking member 4232 can reliably block the second movable limiting member 4212.
[0050] Reference Figure 1A and Figure 1B , in some examples, in a direction perpendicular to the axial direction X, the size of the side of the movable limiting assembly 421 close to the seal 410 is larger than the size of the side of the movable limiting assembly 421 away from the seal 410. The larger size of the side of the movable limiting assembly 421 close to the seal 410 can more reliably limit the seal 410 and prevent the seal 410 from shifting and causing seal failure. In addition, the smaller size of the side of the movable limiting assembly 421 away from the seal 410 can prevent the movable limiting assembly 421 from bumping into the working cylinder 100 or the intermediate cylinder 300 when assembling the movable limiting assembly 421 with the working cylinder 100 and the intermediate cylinder 300. For example, the movable limiting assembly 421 can be installed between the working cylinder 100 and the intermediate cylinder 300. At this time, since the end with a smaller size of the movable limiting assembly 421 can more easily enter between the working cylinder 100 and the intermediate cylinder 300, the installation of the movable limiting assembly 421 can be guided.
[0051] Reference Figure 1A and Figure 1B, in some examples, the first movable limiting member 4211 and the second movable limiting member 4212 respectively include a first portion 4201 and a second portion 4202 connected to each other. The first portion 4201 is configured to limit the sealing member 410. For example, the sealing member 410 abuts between the first portion 4201 of the first movable limiting member 4211 and the first portion 4201 of the second movable limiting member 4212. In a direction perpendicular to the axial direction X, the size of the second portion 4202 gradually decreases from the side close to the first portion 4201 to the side away from the first portion 4201. For example, in the radial direction of the working cylinder 100, the size of the side of the second portion 4202 away from the sealing member 410 is smaller than the size of the side of the second portion 4202 close to the first portion 4201. Through the respective second portions 4202 of the first movable limiting member 4211 and the second movable limiting member 4212, the installation of the first movable limiting member 4211 and the second movable limiting member 4212 can be guided respectively.
[0052] In some examples, the surface of the second portion close to the intermediate cylinder includes an inclined surface or a circular arc surface. Refer to Figure 1A and Figure 1B , for example, the surface of the second portion 4202 facing the intermediate cylinder 300 can be an inclined surface having an angle with the axis to simplify the processing technology. For example, the surface of the second portion facing the intermediate cylinder can be a circular arc surface having a radian. For example, the surface of the second portion facing the intermediate cylinder can be a convex surface to make the connection between the first portion and the second portion smoother and prevent bumps between the edges and corners and the intermediate cylinder. Of course, the surface of the second portion facing the intermediate cylinder can also be a concave surface, and the present disclosure does not limit this.
[0053] Refer to Figure 1A and Figure 1B , for example, at the end of the intermediate cylinder 300, the surface of the side of the intermediate cylinder 300 facing the working cylinder 100 includes an inclined surface or a circular arc surface, so that the radial dimension between the intermediate cylinder 300 and the working cylinder 100 gradually increases from the side close to the sealing member 410 to the end of the intermediate cylinder 300. By increasing the interval between the end of the intermediate cylinder 300 and the working cylinder 100, it is convenient to install the second portion 4202 between the working cylinder 100 and the intermediate cylinder 300.
[0054] Refer to Figure 1A and Figure 1B , in some examples, a receiving space 40 is formed between the end of the second portion 4202 away from the first portion 4201 and the intermediate cylinder 300. The receiving space 40 is configured to receive the blocking member 423, so that the blocking member 423 can enter the limiting groove 422 through the receiving space 40 between the second portion 4202 and the intermediate cylinder 300. For example, the receiving space 40 communicates with the limiting groove 422.
[0055] Refer toFigures 1A to 1C , in some examples, the maximum dimension between the side of the movable limiting component 421 away from the seal 410 and the surfaces of the working cylinder 100 facing each other is the first dimension D1, and the maximum dimension of the blocking member 423 in the direction perpendicular to the axial direction X is the second dimension D2. For example, the maximum dimension of the receiving space 40 in the direction perpendicular to the axial direction X is the first dimension D1. For example, along the direction from the side away from the seal 410 to the side close to the seal 410, the first dimension D1 of at least part of the receiving space 40 gradually decreases. For example, the cross-sectional shape of the blocking member 423 can be circular, and the diameter dimension of the circular cross-section is the second dimension D2. The ratio of the first dimension D1 to the second dimension D2 is 1 / 3 to 2 / 3, so that the blocking member 423 can more easily enter the receiving space 40 and thus more easily enter the limiting groove 422. In addition, the strength of the second part 4202 can be ensured, and the movable limiting component 421 can cooperate with the limiting groove 422 to limit the blocking member 423 in the radial direction. For example, the ratio of the first dimension D1 to the second dimension D2 can be 1 / 3 to 1 / 2. For example, the ratio of the first dimension D1 to the second dimension D2 can be 1 / 2 to 2 / 3.
[0056] Reference Figures 1A to 1C , taking the first movable limiting member 4211, the first limiting groove 4221 and the first blocking member 4231 in the movable limiting component 421 as an example for illustration. For example, the cross-section of the first blocking member 4231 is circular, and the receiving space 40 formed between the second part 4202 of the first movable limiting member 4211 and the working cylinder 100 includes an opening in the axial direction X, and the opening is located on the side away from the seal 410, and the dimension of the opening in the radial direction is the first dimension D1. For example, the dimension of the receiving space 40 in the radial direction can gradually decrease from the opening to the seal 410. For example, between the part of the first movable limiting member 4211 that is not in contact with the first blocking member 4231 and the working cylinder 100, the dimension of the receiving space 40 in the radial direction can be consistent.
[0057] Reference Figures 1A to 1C , for example, the first blocking member 4231 includes a first blocking surface P1, and the first movable limiting member 4211 includes a first mating surface Q1; the first blocking surface P1 is configured to fit with the first mating surface Q1 so that the abutting area between the first blocking member 4231 and the first movable limiting member 4211 is larger, and the blocking of the first movable limiting member 4211 by the first blocking member 4231 is more reliable. For example, the second blocking member 4232 includes a second blocking surface P2, and the second movable limiting member 4212 includes a second mating surface Q2; the second blocking surface P2 is configured to fit with the second mating surface Q2 so that the abutting area between the second blocking member 4232 and the second movable limiting member 4212 is larger, and the blocking of the second movable limiting member 4212 by the second blocking member 4232 is more reliable.
[0058] Reference Figures 1A to 1C For example, the first mating surface Q1 may include a curved surface. The cross-sectional shape of the first blocking member 4231 may be circular, and the curved first mating surface Q1 can better fit the surface of the first blocking member 4231. For example, the first mating surface may include a flat surface. The cross-sectional shape of the first blocking member may be rectangular, and the flat first mating surface can better fit the surface of the first blocking member. For example, the second mating surface Q2 may include a curved surface. The cross-sectional shape of the second blocking member 4232 may be circular, and the curved second mating surface Q2 can better fit the surface of the second blocking member 4232. For example, the second mating surface may include a flat surface. The cross-sectional shape of the second blocking member may be rectangular, and the flat second mating surface can better fit the surface of the second blocking member.
[0059] Reference Figures 1A to 1C For example, the first limiting groove 4221 includes a first limiting wall surface R1, and the first limiting wall surface R1 is located on the side of the first limiting groove 4221 away from the seal 410. The first blocking member 4231 includes a third blocking surface P3, and the third blocking surface P3 is configured to fit with the first limiting wall surface R1 so that the first movable limiting member 4211 is limited between the first mating surface Q1 and the first limiting wall surface R1. For example, both the first limiting wall surface R1 and the third blocking surface P3 may include curved surfaces. For example, both the first limiting wall surface and the third blocking surface may include flat surfaces.
[0060] Reference Figures 1A to 1C For example, the second limiting groove 4222 includes a second limiting wall surface R2, and the second limiting wall surface R2 is located on the side of the second limiting groove 4222 away from the seal 410. The second blocking member 4232 includes a fourth blocking surface P4, and the fourth blocking surface P4 is configured to fit with the second limiting wall surface R2 so that the second movable limiting member 4212 is limited between the second mating surface Q2 and the second limiting wall surface R2. For example, both the second limiting wall surface R2 and the fourth blocking surface P4 may include curved surfaces. For example, both the second limiting wall surface and the fourth blocking surface may include flat surfaces.
[0061] Reference Figures 1A to 1C, for example, the inner wall surface of the limiting groove 422 is a curved surface. For example, the first limiting wall surface R1 is a part of the inner wall surface of the first limiting groove 4221, and the second limiting wall surface R2 is a part of the inner wall surface of the second limiting groove 4222. The blocking member 423 includes a curved surface facing the inner wall surface. For example, the radius of curvature of the curved surface can be equal to the radius of curvature of the inner wall surface, so that the limiting groove 422 can better limit the blocking member 423, preventing the limiting failure of the blocking member 423 on the movable limiting component 421 due to the sliding of the blocking member 423 during the use of the shock absorber, and further preventing the sealing failure caused by the displacement of the seal 410. For example, the radius of curvature of the curved surface can be less than the radius of curvature of the inner wall surface, so as to prevent the blocking member from being difficult to install into the limiting groove due to the existence of tolerances. For example, when the blocking member is located in the limiting groove, there can be a gap between the blocking member and the inner wall surface of the limiting groove.
[0062] Reference Figures 1A to 1C , in some examples, in the direction perpendicular to the axis direction X, the ratio of the maximum dimension of the limiting groove 422 to the maximum dimension of the blocking member 423 is 1 / 3 - 2 / 3. For example, 1 / 3 - 2 / 3 of the blocking member 423 is located in the limiting groove 422. While simplifying the processing technology of the limiting groove 422, it can also enable the blocking member 423 to be reliably limited in the limiting groove 422. For example, the maximum dimension of the blocking member 423 is the second dimension D2. For example, in the direction perpendicular to the axis direction X, the ratio of the maximum dimension of the limiting groove 422 to the maximum dimension of the blocking member 423 can be 1 / 3 - 1 / 2. For example, in the direction perpendicular to the axis direction X, the ratio of the maximum dimension of the limiting groove 422 to the maximum dimension of the blocking member 423 can be 1 / 2 - 2 / 3.
[0063] Reference Figures 1A to 1C , for example, in the direction perpendicular to the axis direction X, the maximum dimension of the limiting groove 422 is the third dimension D3. The sum of the first dimension D1 and the third dimension D3 can be equal to the second dimension D2, so that the movable limiting component 421 and the limiting groove 422 can reliably limit the blocking member 423 in the radial direction. For example, the sum of the first dimension and the third dimension can be greater than the second dimension, preventing it from being difficult to install the blocking member between the movable limiting component and the limiting groove due to the existence of tolerances, making the assembly process easier.
[0064] Reference Figure 1A and Figure 1D, in some examples, the working cylinder 100 includes a working chamber 10. An intermediate chamber 20 is formed between the working cylinder 100 and the intermediate cylinder 300, and an oil storage chamber 30 is formed between the intermediate cylinder 300 and the oil storage cylinder 200. The working cylinder 100 includes a first opening 110, and the intermediate cylinder 300 includes a second opening 310. The first opening 110 and the second opening 310 are configured to allow fluid to flow between the working chamber 10, the intermediate chamber 20, and the oil storage chamber 30. For example, the fluid is damping liquid. For example, the fluid is oil.
[0065] Reference Figure 1A and Figure 1D , for example, the shock absorber further includes a piston rod 500, an end cap 600, a compression valve 700, and a solenoid valve 800. For example, the piston rod 500 is disposed inside the working cylinder 100 and is configured to reciprocate along the axial direction X of the working cylinder 100, so as to control the flow direction of the fluid inside the shock absorber through the movement of the piston rod 500. The end cap 600 is sleeved outside the piston rod 500 and is connected to the oil storage cylinder 200 to seal the shock absorber through the end cap 600. The compression valve 700 is disposed on a side of the intermediate cylinder 300 away from the end cap 600. The compression valve 700 can control the flow rate and damping characteristics of the fluid, and can also improve the response speed of the shock absorber, so that the shock absorber can damp the vibration under different road conditions more quickly. For example, the solenoid valve 800 is communicated with the oil storage cylinder 200. By controlling the opening and closing of the solenoid valve 800, the flow rate of the fluid in the oil storage cylinder 200 can be adjusted, so that the shock absorber can achieve a better damping effect under different road conditions.
[0066] Figure 2 is a schematic cross-sectional view of the shock absorber provided by an example in at least one embodiment of the present disclosure. Figure 2 and Figure 1A The differences at least include Figure 2 The number of solenoid valves 800 of the shock absorber shown in Figure 1A is different from the number of solenoid valves 800 of the shock absorber shown in Figure 2 The number of second openings 310 of the shock absorber shown in Figure 1A is different from the number of second openings 310 of the shock absorber shown in Figure 2 and Figure 1A There may also be more differences between
[0067] Reference Figure 1A 、 Figure 1D and Figure 2, in some examples, a plurality of sealing assemblies 400 include a first end sealing assembly 401 and a second end sealing assembly 402 that are spaced apart along the axial direction X. In a plane parallel to the axial direction X, the orthographic projections of the first opening 110 and the second opening 310 are both located between the orthographic projections of the first end sealing assembly 401 and the second end sealing assembly 402. The first opening 110 and the second opening 310 located in the first end sealing assembly 401 and the second end sealing assembly 402 enable fluid to flow through the working chamber 10, the intermediate chamber 20, and the oil storage chamber 30.
[0068] Figure 1A and Figure 1D shows a schematic diagram of a shock absorber including a solenoid valve 800. Refer to Figure 1A and Figure 1D , a second opening 310 is formed in the intermediate cylinder 300 so that the solenoid valve 800 communicates with the intermediate chamber 20 through the second opening 310. For example, a third opening 210 corresponding to the second opening 310 is formed in the oil storage cylinder 200, and the solenoid valve 800 communicates with the oil storage chamber 30 through the third opening 210. During the use of the shock absorber, the shock absorber can adjust the flow rate of the fluid between the working chamber 10, the intermediate chamber 20, and the oil storage chamber 30 through the solenoid valve 800, thereby adjusting the damping value of the shock absorber.
[0069] Figure 2 shows a schematic diagram of a shock absorber including two solenoid valves 800. The two solenoid valves 800 are spaced apart along the axial direction X. Refer to Figure 2 , two second openings 310 are formed in the intermediate cylinder 300 so that the two solenoid valves 800 communicate with the intermediate chamber 20 through one corresponding second opening 310 respectively. For example, the two openings are spaced apart along the axial direction X. For example, two third openings 210 corresponding to the second opening 310 are formed in the oil storage cylinder 200, and the two solenoid valves 800 communicate with the oil storage chamber 30 through one corresponding third opening 210 respectively. During the use of the shock absorber, the shock absorber can adjust the flow rate of the fluid between the working chamber 10, the intermediate chamber 20, and the oil storage chamber 30 through the solenoid valve 800, thereby adjusting the damping value of the shock absorber. Moreover, by providing two solenoid valves 800, the adjustment range of the damping value can be expanded, so that the shock absorber can be applied to more scenarios.
[0070] Figure 3A is a cross-sectional schematic diagram of a shock absorber provided by an example in at least one embodiment of the present disclosure. Figure 3B is Figure 3A a partial enlarged schematic diagram at C in Figure 3A and Figure 1A The differences from Figure 3A at least include that the number of solenoid valves 800 of the shock absorber shown in Figure 1AThe number of solenoid valves 800 of the shock absorber shown is different, Figure 3A the number of second openings 310 of the shock absorber shown is the same as Figure 1A the number of second openings 310 of the shock absorber shown is different, Figure 3A the number of seal assemblies 400 of the shock absorber shown is the same as Figure 1A the number of seal assemblies 400 of the shock absorber shown is different, Figure 3A the number of first openings 110 of the shock absorber shown is different from the number of first openings 110 of the shock absorber shown in FIG. 1. Of course, Figure 3A between Figure 1A there may also be more differences, and the present disclosure does not limit this.
[0071] Referring to Figure 3A and Figure 3B , in some examples, the plurality of seal assemblies 400 further includes an intermediate seal assembly 403 located between the first end seal assembly 401 and the second end seal assembly 402. By providing the intermediate seal assembly 403, the intermediate chamber 20 can be divided into a plurality of chambers, thereby realizing the adjustment of the damping value without manufacturing a plurality of intermediate cylinders 300, which simplifies the manufacturing process and assembly steps. For example, a chamber is formed between the intermediate seal assembly 403 and the first end seal assembly 401, and another chamber is formed between the intermediate seal assembly 403 and the second end seal assembly 402. For example, a plurality of intermediate seal assemblies 403 may be provided, and a chamber may be formed between two adjacent intermediate seal assemblies 403. The first opening 110 is provided in plurality, and the second opening 310 is provided in plurality. In a plane parallel to the axial direction X, the orthographic projection of the intermediate seal assembly 403 is located between the orthographic projections of two adjacent second openings 310, and the orthographic projection of the intermediate seal assembly 403 is located between the orthographic projections of two adjacent first openings 110. By setting the positional relationship between the intermediate seal assembly 403 and the first opening 110 and the second opening 310 respectively, it is possible to enable the fluid to flow between the working chamber 10, the intermediate chamber 20 and the oil storage chamber 30 through the first opening 110 and the second opening 310.
[0072] Referring to Figures 1A to 3B, at least one embodiment of the present disclosure provides an assembling method for a shock absorber, and the method includes: sleeving a first end seal assembly 401 on one end of a working cylinder 100; sleeving the first end of an intermediate cylinder 300 on the side of the first end seal assembly 401 away from the working cylinder 100; and sleeving a second end seal assembly 402 on the other end of the working cylinder 100. For example, after sleeving the first end seal assembly 401, the intermediate cylinder 300 is sleeved on the end of the working cylinder 100, and then the second end seal assembly 402 is sleeved on the other end of the working cylinder 100. Thus, there is sufficient installation space when installing the first end seal assembly 401 and the second end seal assembly 402, and there will be no interference with the intermediate cylinder 300.
[0073] Reference Figures 1A to 3B , move the intermediate cylinder 300 along the axial direction X of the working cylinder 100 so that the first end of the intermediate cylinder 300 is sleeved on the side of the second end seal assembly 402 away from the working cylinder 100, and the second end of the intermediate cylinder 300 is sleeved on the side of the first end seal assembly 401 away from the working cylinder 100. By sliding the intermediate cylinder 300, it can be ensured that the first end of the intermediate cylinder 300 is sealed between the second end seal assembly 402 and the working cylinder 100, and at the same time, the second end of the intermediate cylinder 300 is sealed between the first end seal assembly 401 and the working cylinder 100. In addition, taking Figure 1A and Figure 1B as an example, when the first end of the intermediate cylinder 300 is sleeved on the working cylinder 100 and the first end seal assembly 401 is provided, the inclined surface inside the first end of the intermediate cylinder 300 can cooperate with the inclined surface on the first movable limiting member 4211 in the first end seal assembly 401 to jointly increase the interval between the working cylinder 100 and the intermediate cylinder 300 and prevent knocking and scratching. When the intermediate cylinder 300 is slid to the second end seal assembly 402, the inclined surface inside the first end of the intermediate cylinder 300 can cooperate with the inclined surface on the second movable limiting member 4212 in the second end seal assembly 402 to jointly increase the interval between the working cylinder 100 and the intermediate cylinder 300 and prevent knocking and scratching.
[0074] The first end sealing assembly 401 and the second end sealing assembly 402 each include: a movable limiting assembly 421, a limiting groove 422, and a blocking member 423. The movable limiting assembly 421 is sleeved outside the working cylinder 100 and is movable in the axial direction X of the working cylinder 100; the limiting groove 422 is located on the side of the working cylinder 100 facing the intermediate cylinder 300. The movable limiting assembly 421 is configured to limit the sealing member 410, and a part of the blocking member 423 is located in the limiting groove 422 and is configured to block the movable limiting assembly 421. After sleeving the first end sealing assembly 401, the intermediate cylinder 300, and the second end sealing assembly 402, by moving the intermediate cylinder 300, the first end sealing assembly 401 and the second sealing assembly 400 are sealed between the intermediate cylinder 300 and the working cylinder 100, and the assembly of the intermediate cylinder 300 and the working cylinder 100 can be more easily achieved. Of course, in some other examples, the working cylinder and the intermediate cylinder can also be pre-positioned first, and then the first end sealing assembly and the second end sealing assembly are sleeved from both ends of the working cylinder respectively, and the present disclosure does not limit this.
[0075] For example, sleeving the first end sealing assembly 401 on one end of the working cylinder 100 includes: sleeving the first blocking member 4231 outside the working cylinder 100 and arranging the first blocking member 4231 in the first limiting groove 4221; sleeving the first movable limiting member 4211 outside the working cylinder 100 and making the first movable limiting member 4211 abut against the first blocking member 4231; sequentially sleeving the sealing member 410 and the second movable limiting member 4212 outside the working cylinder 100; sleeving the second blocking member 4232 outside the working cylinder 100 and arranging the second blocking member 4232 in the second limiting groove 4222. The second limiting groove 4222 and the first limiting groove 4221 are spaced apart along the axial direction X of the working cylinder 100, the second blocking member 4232 abuts against the second movable limiting member 4212, and the sealing member 410 is limited between the first movable limiting member 4211 and the second movable limiting member 4212. For example, sleeving the second end sealing assembly 402 on the other end of the working cylinder 100, since the components in the second end sealing assembly 402 can be the same as those in the first end sealing assembly 401, the assembly method of the foregoing first end sealing assembly 401 can also be adopted, and details are not described herein again.
[0076] In addition, since the assembly method of the shock absorber according to the embodiments of the present disclosure is used for the above shock absorber, it also has corresponding beneficial technical effects, which are not described herein again.
[0077] The following points need to be noted:
[0078] (1) In the accompanying drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the general design.
[0079] (2) Where there is no conflict, the features in the same embodiment and different embodiments of the present disclosure may be combined with each other.
[0080] The above description is only an exemplary embodiment of the present disclosure and is not intended to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.
Claims
1. A shock absorber, comprising: A working cylinder; An oil storage cylinder, sleeved outside the working cylinder; An intermediate cylinder, located between the oil storage cylinder and the working cylinder; And A plurality of sealing assemblies, each of the sealing assemblies including a seal and a limiting assembly, the seal being disposed between the intermediate cylinder and the working cylinder; Wherein, the limiting assembly includes: A movable limiting assembly, sleeved outside the working cylinder and movable in the axial direction of the working cylinder; A limiting groove, located on a side of the working cylinder facing the intermediate cylinder; and A blocking member, Wherein, the movable limiting assembly is configured to limit the seal, and the blocking member is partially located in the limiting groove and is configured to block the movable limiting assembly.
2. The shock absorber according to claim 1, wherein, The shape of the movable limiting assembly on a reference plane perpendicular to the axial direction includes a ring shape, and the shape of the blocking member on the reference plane is a ring shape with a notch.
3. The shock absorber according to claim 1, wherein, The movable limiting assembly includes a first movable limiting member and a second movable limiting member arranged at intervals in the axial direction of the working cylinder, and the seal is located between the first movable limiting member and the second movable limiting member. The limiting groove includes a first limiting groove and a second limiting groove arranged at intervals in the axial direction of the working cylinder, the blocking member includes a first blocking member and a second blocking member, the first blocking member is partially located in the first limiting groove and is configured to block the first movable limiting member, and the second blocking member is partially located in the second limiting groove and is configured to block the second movable limiting member.
4. The shock absorber according to any one of claims 1 to 3, wherein, The working cylinder includes a working chamber, an intermediate chamber is formed between the working cylinder and the intermediate cylinder, and an oil storage chamber is formed between the intermediate cylinder and the oil storage cylinder; The working cylinder includes a first opening, and the intermediate cylinder includes a second opening; The first opening and the second opening are configured to allow fluid to flow between the working chamber, the intermediate chamber and the oil storage chamber.
5. The shock absorber according to claim 4, wherein, The plurality of sealing assemblies include a first end sealing assembly and a second end sealing assembly arranged at intervals in the axial direction; On a plane parallel to the axial direction, the orthographic projection of the first opening and the orthographic projection of the second opening are both located between the orthographic projection of the first end sealing assembly and the orthographic projection of the second end sealing assembly.
6. The shock absorber according to claim 5, wherein, The plurality of sealing assemblies further include an intermediate sealing assembly located between the first end sealing assembly and the second end sealing assembly; the first opening is provided in plurality, and the second opening is provided in plurality; On a plane parallel to the axial direction, the orthographic projection of the intermediate sealing assembly is located between the orthographic projections of two adjacent second openings, and the orthographic projection of the intermediate sealing assembly is located between the orthographic projections of two adjacent first openings.
7. The shock absorber according to any one of claims 1 to 3, wherein, On a plane parallel to the axial direction, the orthographic projection of the blocking member overlaps with the orthographic projection of the movable limiting assembly.
8. The shock absorber according to any one of claims 1 to 3, wherein, In a direction perpendicular to the axial direction, The size of a side of the movable limiting assembly close to the seal is larger than the size of a side of the movable limiting assembly away from the seal.
9. The shock absorber according to claim 3, wherein, The first movable limiting member and the second movable limiting member respectively include a first part and a second part connected to each other; the first part is configured to limit the seal; In a direction perpendicular to the axial direction, the size of the second part gradually decreases from the side close to the first part to the side away from the first part.
10. The shock absorber according to claim 9, wherein, The surface of the second part close to the intermediate cylinder includes an inclined surface or a circular arc surface.
11. The shock absorber according to claim 9, wherein, A receiving space is formed between one end of the second part away from the first part and the intermediate cylinder; The receiving space is configured to receive the blocking member.
12. The shock absorber according to any one of claims 1 to 3, wherein, The maximum dimension between the side of the movable limiting assembly away from the seal and the surface of the working cylinder facing each other is a first dimension, and the maximum dimension of the blocking member in a direction perpendicular to the axial direction is a second dimension; The ratio of the first dimension to the second dimension is 1 / 3 to 2 / 3.
13. The shock absorber according to any one of claims 1 to 3, wherein, In a direction perpendicular to the axial direction, The ratio of the maximum dimension of the limiting groove to the maximum dimension of the blocking member is 1 / 3 to 2 / 3.
14. The shock absorber according to any one of claims 1 to 3, wherein, There is a gap between the movable limiting assembly and the intermediate cylinder.
15. An assembling method of a shock absorber, comprising: Sheathing a first end sealing assembly on one end of the working cylinder; Sheathing the first end of the intermediate cylinder on the side of the first end sealing assembly away from the working cylinder; Sheathing a second end sealing assembly on the other end of the working cylinder; and Moving the intermediate cylinder along the axial direction of the working cylinder so that the first end of the intermediate cylinder is sheathed on the side of the second end sealing assembly away from the working cylinder, and the second end of the intermediate cylinder is sheathed on the side of the first end sealing assembly away from the working cylinder, wherein, each of the first end sealing assembly and the second end sealing assembly includes: A movable limiting assembly, sheathed outside the working cylinder and movable in the axial direction of the working cylinder; A limiting groove, located on the side of the working cylinder facing the intermediate cylinder; and A blocking member, wherein, the movable limiting assembly is configured to limit the seal, and the blocking member is partially located in the limiting groove and is configured to block the movable limiting assembly.