Hydraulic cushion assembly and shock absorber

Abstract

The application discloses a hydraulic buffering assembly and a shock absorber, and relates to the technical field of shock absorbers. The hydraulic buffering assembly comprises an oil storage cylinder, a mounting seat, a first elastic element and a buffering sleeve which are arranged in the oil storage cylinder. The first elastic element is located between the closed end of the oil storage cylinder and the mounting seat. The mounting seat and the buffering sleeve are both in sliding connection with the oil storage cylinder. The buffering sleeve is used for being connected with a piston rod. A liquid flow channel can be formed between the mounting seat and the buffering sleeve. Under the action of the piston rod, the buffering sleeve can be in contact with the mounting seat to close the liquid flow channel. The shock absorber comprises the hydraulic buffering assembly. The hydraulic buffering assembly and the shock absorber solve the problem that the existing shock absorber needs to occupy a relatively long stroke to realize effective impact absorption and energy conversion when hydraulic buffering is performed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shock absorbers, in particular to a hydraulic buffering assembly and a shock absorber. BACKGROUND

[0002] Generally, when a shock absorber performs hydraulic buffering, a relatively long stroke is often required to achieve effective impact absorption and energy conversion, thereby placing higher requirements on the design. In order to ensure that the shock absorber can stably operate in various complex working environments, it is necessary to accurately calculate and control key parameters such as the flow resistance of hydraulic oil, the piston area, and the channel size. In addition, the influence of temperature changes on hydraulic oil and the possible degradation of hydraulic oil after long-term use also need to be considered, which may affect the working efficiency and service life of the shock absorber.

[0003] The traditional hydraulic buffering device is limited by the design of a limited stroke, and under the action of impact load, stroke saturation phenomenon is easy to occur, which leads to nonlinear distortion of the damping characteristic curve of the shock absorber, and it is difficult to achieve effective energy dissipation and pressure gradient optimization, thereby affecting the buffering and pressure relief efficiency of the system. SUMMARY

[0004] The purpose of the present application is to provide a hydraulic buffering assembly and a shock absorber, which solves the problem that the existing shock absorber needs to occupy a relatively long stroke to achieve effective impact absorption and energy conversion when performing hydraulic buffering.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] The present application provides a hydraulic buffering assembly, comprising: an oil storage cylinder, a mounting seat, a first elastic element and a buffering sleeve arranged in the oil storage cylinder, the first elastic element being located between the closed end of the oil storage cylinder and the mounting seat, the mounting seat and the buffering sleeve being in sliding connection with the oil storage cylinder, the buffering sleeve being used for connecting with a piston rod, a liquid flow channel being formed between the mounting seat and the buffering sleeve, and the liquid flow channel being closed by the contact between the buffering sleeve and the mounting seat under the action of the piston rod.

[0007] In some specific solutions, the closed end of the oil storage cylinder is provided with a fixed cover, the fixed cover is provided with a first limiting protrusion, the first limiting protrusion and the closed end of the oil storage cylinder form a first limiting groove, one end of the first elastic element is located in the first limiting groove, the first limiting protrusion is used for limiting the axial position of the first elastic element, and the first limiting groove is used for limiting the radial position of the first elastic element.

[0008] In some specific solutions, the mounting base is provided with a second limiting protrusion, the second limiting protrusion forms a second limiting groove, the other end of the first elastic element is located in the second limiting groove, the second limiting protrusion is used for limiting the axial position of the first elastic element, and the second limiting groove is used for limiting the radial position of the first elastic element.

[0009] In some specific solutions, the fixing cover is detachably connected with the closed end of the oil storage cylinder, and the fixing cover is coaxially arranged with the oil storage cylinder.

[0010] In some specific solutions, sealing structures are arranged between the mounting base and the oil storage cylinder and between the buffer sleeve and the oil storage cylinder.

[0011] In some specific solutions, the buffer sleeve is provided with a tapered sealing surface at one end facing the mounting base, and the cross-sectional size of the liquid flow channel gradually decreases during movement of the buffer sleeve towards the mounting base under the action of the piston rod.

[0012] In some specific solutions, a second elastic element is further included, and the second elastic element is located between the mounting base and the buffer sleeve.

[0013] In some specific solutions, the second elastic element is at least two, and the two second elastic elements are uniformly distributed along the circumference of the mounting base.

[0014] In some specific solutions, the oil storage cylinder, the first elastic element, the mounting base and the buffer sleeve are coaxially arranged.

[0015] The application further provides a shock absorber comprising the hydraulic buffer assembly.

[0016] The application has the following technical effects relative to the prior art:

[0017] The first elastic element can significantly increase the buffer stroke of the shock absorber, so that the change of the buffer force value is more gentle and linear. And the liquid flow channel is closed by the mounting base and the buffer sleeve, so that the oil cavity formed by the oil storage cylinder, the mounting base and the buffer sleeve is significantly increased, forming a high-pressure cavity. This design greatly improves the buffering effect. Specifically, when subjected to an external impact, the first elastic element can be compressed or rebounded accordingly according to the size of the applied pressure. This feature allows the hydraulic buffer assembly to evenly distribute impact energy over a longer stroke. Compared with traditional buffering design, this improved way can effectively reduce the occurrence of peak force, avoiding the risk of potential damage to the shock absorber. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 A hydraulic buffer assembly in some embodiments of the present application Figure 1 ;

[0020] Figure 2 A partial enlarged view of A in Figure 1 ;

[0021] Figure 3 A partial enlarged view of B in Figure 1 ;

[0022] Figure 4 A hydraulic buffer assembly in some embodiments of the present application Figure 2 ;

[0023] Figure 5 A hydraulic buffer assembly in some embodiments of the present application Figure 3 ;

[0024] In the figure: 1 - oil storage cylinder, 2 - mounting seat, 3 - first elastic element, 4 - buffer sleeve, 5 - liquid flow channel, 6 - piston rod, 7 - fixed cover, 8 - first limiting protrusion, 9 - second limiting protrusion, 10 - sealing structure, 11 - second elastic element, 12 - conical sealing surface. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of the present application.

[0026] The purpose of the present application is to provide a hydraulic buffer assembly and a shock absorber, which solves the problem that the existing shock absorber needs to occupy a relatively long stroke to achieve effective impact absorption and energy conversion when performing hydraulic buffering.

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Embodiment one

[0029] As Figures 1 to 5As shown, the embodiment provides a hydraulic buffer assembly, which comprises an oil storage cylinder 1, a mounting seat 2, a first elastic element 3 and a buffer sleeve 4 arranged in the oil storage cylinder 1, the first elastic element 3 is located between the closed end of the oil storage cylinder 1 and the mounting seat 2, the mounting seat 2 and the buffer sleeve 4 are both in sliding connection with the oil storage cylinder 1, the buffer sleeve 4 is used to be connected with one end of a piston rod 6, a liquid flow channel 5 can be formed between the mounting seat 2 and the buffer sleeve 4, under the action of the piston rod 6, the buffer sleeve 4 can close the liquid flow channel 5 when it is in contact with the mounting seat 2. The first elastic element 3 is mainly responsible for absorbing and releasing energy, and provides necessary elastic support for damping. The embodiment takes into account the load requirements under different working environments, and ensures that good rebound performance can be maintained under various stress conditions. The design of the first elastic element 3 can significantly increase the buffer stroke of the damper, so that the change of the buffer force value is more gentle and linear. And by closing the liquid flow channel 5 through the mounting seat 2 and the buffer sleeve 4, the pressure of the oil cavity formed by the oil storage cylinder 1, the mounting seat 2 and the buffer sleeve 4 is significantly increased, forming a high-pressure cavity. This design greatly improves the buffering effect. Specifically, when subjected to external impact, the first elastic element 3 can be compressed or rebounded accordingly according to the size of the applied pressure. This feature allows the hydraulic buffer assembly to evenly distribute impact energy over a longer stroke. Compared with traditional buffer designs, this improved design can effectively reduce the occurrence of peak force and avoid the risk of potential damage to the damper.

[0030] In the detailed description of some embodiments, the closed end of the oil storage cylinder 1 is provided with a fixed cover 7, the fixed cover 7 is provided with a first limiting protrusion 8, the first limiting protrusion 8 and the closed end of the oil storage cylinder 1 form a first limiting groove, one end of the first elastic element 3 is located in the first limiting groove, the inner wall of the first limiting groove is arc-shaped and matches the shape of the first elastic element 3, the first limiting protrusion 8 is used to limit the axial position of the first elastic element 3, and the first limiting groove is used to limit the radial position of the first elastic element 3.

[0031] In the detailed description of some embodiments, the fixed cover 7 is detachably connected with the closed end of the oil storage cylinder 1, and the fixed cover 7 is coaxially arranged with the oil storage cylinder 1. The fixed cover 7 is detachably connected with the closed end of the oil storage cylinder 1 by bolts, and the fixed cover 7 serves as an important structure during installation, which can ensure that the first elastic element 3 and the oil storage cylinder 1 can be stably connected.

[0032] In the specific implementation of some embodiments, the mounting seat 2 is provided with a second limiting protrusion 9, the second limiting protrusion 9 forms a second limiting groove, the other end of the first elastic element 3 is located in the second limiting groove, the inner wall of the second limiting groove is arc-shaped and matches the shape of the first elastic element 3, the second limiting protrusion 9 is used to limit the axial position of the first elastic element 3, and the second limiting groove is used to limit the radial position of the first elastic element 3. The mounting seat 2 is a supporting base of the first elastic element 3 and participates in the transmission and distribution of force. By optimizing the shape of the mounting seat 2, the pressure can be effectively dispersed, and local wear can be reduced. The liquid flow channel 5 formed by the mounting seat 2 and the buffer sleeve 4 reduces the compression damping force and increases the rebound damping force, so that the working process of the shock absorber is softer, rebound impact is avoided, and the vehicle is more comfortable to drive.

[0033] In the specific implementation of some embodiments, sealing structures 10 are arranged between the mounting seat 2 and the oil storage cylinder 1 and between the buffer sleeve 4 and the oil storage cylinder 1, so that the mounting seat 2 and the buffer sleeve 4 can be sealed with the oil storage cylinder 1 when sliding, and leakage of oil is avoided.

[0034] In the specific implementation of some embodiments, the end of the buffer sleeve 4 towards the mounting seat 2 is provided with a tapered sealing surface 12. Under the action of the piston rod 6, the cross-sectional size of the liquid flow channel 5 gradually decreases during the movement of the buffer sleeve 4 towards the mounting seat 2, so that gradual closing is realized. During the movement of the buffer sleeve 4 away from the mounting seat 2, the cross-sectional size of the liquid flow channel 5 gradually increases, so that gradual opening is realized.

[0035] In the specific implementation of some embodiments, a second elastic element 11 is further included and located between the mounting seat 2 and the buffer sleeve 4. The second elastic element 11 can play a buffering role during the movement of the buffer sleeve 4 towards the mounting seat 2 and can provide elastic force during the movement of the buffer sleeve 4 away from the mounting seat 2, so that the liquid flow channel 5 is opened.

[0036] In the specific implementation of some embodiments, the second elastic element 11 is at least two, and the two second elastic elements 11 are uniformly distributed along the circumference of the mounting seat 2, so that uniform buffering force and elastic force can be provided.

[0037] In the specific implementation of some embodiments, the oil storage cylinder 1, the fixed cover 7, the first elastic element 3, the mounting seat 2 and the buffer sleeve 4 are coaxially arranged, so that the structure remains stable during the entire working process.

[0038] In the specific implementation of some embodiments, the first elastic element 3 and the second elastic element 11 are both springs. The first elastic element 3 is made of 55SiCr (silicon-chromium steel) material and is subjected to induction quenching + medium-temperature tempering + stress shot blasting strengthening process, so as to improve the tensile strength and corrosion resistance, and ensure durability and fatigue resistance.

[0039] In the detailed description of some embodiments, the mounting seat 2 uses A356-T6 aluminum alloy material and is manufactured by high vacuum pressure casting (HPDC) + T6 heat treatment casting or forging process, which ensures that it has sufficient hardness and wear resistance.

[0040] Working process of the embodiment:

[0041] Compression working condition:

[0042] The piston rod 6 moves under the action of external load, and moves from right to left in the direction of the arrow, pushing the buffer sleeve 4 to move towards the mounting seat 2. At the same time, the buffer sleeve 4 compresses the second elastic element 11, and the conical sealing surface 12 of the buffer sleeve 4 gradually closes the liquid flow passage 5. Figure 1

[0043] When the liquid flow passage 5 is completely closed, the oil cavity formed by the oil storage cylinder 1, the mounting seat 2 and the buffer sleeve 4 has a significantly increased pressure, forming a high-pressure cavity.

[0044] At this time, the piston rod 6 continues to move, compressing the first elastic element 3, and the pressure of the oil cavity formed by the oil storage cylinder 1, the mounting seat 2 and the buffer sleeve 4 sharply rises, and the hydraulic resistance significantly increases, realizing the stepwise absorption of impact energy.

[0045] Recovery working condition:

[0046] After the external load is removed, i.e. the piston rod 6 moves towards the direction away from the mounting seat 2, the first elastic element 3 releases the stored energy, pushing the mounting seat 2 to reset in the direction of the piston rod 6, and the second elastic element 11 provides auxiliary rebound force.

[0047] The second elastic element 11 pushes the buffer sleeve 4 to move away from the mounting seat 2, opening the liquid flow passage. With the movement of the buffer sleeve 4, the liquid flow passage 5 gradually increases, and the oil liquid flows back to the low-pressure cavity (i.e. the cavity where the piston rod 6 is located) through the liquid flow passage 5, and the system returns to standby state.

[0048] ​The stroke compression of the first elastic element 3 is used to realize hydraulic buffering, adjust damping force, realize effective impact absorption and energy conversion, shorten the buffering stroke, make the buffering force value more gentle, make the shock absorber working process more gentle, avoid rebound impact, and make the vehicle ride more comfortable. By adopting the cooperation of the fixed cover 7 and the mounting seat 2, the radial constraint and axial pre-tightening of the first elastic element 3 are realized, the dynamic buckling and modal coupling phenomena of the first elastic element 3 under overload working conditions are effectively inhibited, and the dynamic stiffness stability and energy dissipation efficiency of the hydraulic buffering assembly under transient impact load are maintained. The critical buckling load of the shock absorber is significantly improved, and the optimal force-displacement hysteresis characteristic is ensured under extreme working conditions. The opening characteristic of the liquid flow channel 5 can realize the nonlinear adjustable range control of the damping force value, so as to optimize the speed-damping force gradient curve (F-V characteristic curve) of the shock absorber. This valve system adjustment mechanism based on fluid dynamics can significantly improve the dynamic response characteristics of the shock absorber under various working conditions, and the piston rod 6 movement process presents better linearity and smoothness. The second elastic element 11 in the embodiment can play a buffering role during the movement of the buffering sleeve 4 towards the mounting seat 2, so that the liquid flow channel 5 is gradually closed, and can provide elastic force during the movement of the buffering sleeve 4 away from the mounting seat 2, so that the liquid flow channel 5 is gradually opened.

[0049] Embodiment two

[0050] As Figures 1 to 5 shown, the embodiment provides a shock absorber including the hydraulic buffering assembly of embodiment one. The first elastic element 3 of the embodiment is mainly responsible for absorbing and releasing energy, and provides necessary elastic support for damping. The embodiment considers the load requirements under different working environments, and ensures good rebound performance under various stress conditions. The design of the first elastic element 3 of the embodiment can significantly increase the buffering stroke of the shock absorber, so that the change of the buffering force value is more gentle and linear. And by closing the liquid flow channel 5 through the mounting seat 2 and the buffering sleeve 4, the oil cavity pressure formed by the oil storage cylinder 1, the mounting seat 2 and the buffering sleeve 4 is significantly increased, forming a high-pressure cavity. This design greatly improves the buffering effect. Specifically, when subjected to external impact, the first elastic element 3 can compress or rebound accordingly according to the size of the applied pressure. This feature allows the hydraulic buffering assembly to uniformly distribute impact energy over a longer stroke. Compared with traditional buffering design, this improved method can effectively reduce the occurrence of peak force, avoiding the risk of potential damage to the shock absorber.

[0051] In the description of the present application, it needs to be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second" and the like can be explicitly or implicitly included one or more times. In the description of the present application, unless otherwise specified and limited, the term "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0052] In the description of the present application, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0053] If the present application discloses or involves parts or structural members fixedly connected to each other, unless otherwise stated, the fixed connection can be understood as: detachable fixed connection (for example, connected by bolts or screws), or as: non-detachable fixed connection (for example, riveting, welding), of course, the fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming process) (except for obvious cases that cannot be used by integral forming process).

[0054] In addition, the terms used to indicate the positional relationship or shape in any technical solution disclosed by the present application include the approximate, similar or close state or shape unless otherwise stated.

[0055] Any component provided by the present application can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

[0056] It should be noted that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the present application, therefore, any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effect and purpose that can be achieved by the present application, should still fall within the scope covered by the technical content disclosed by the present application.

[0057] It should be noted that the same reference signs are used to denote the same component or the same part throughout the drawings in the embodiments of the present application.

[0058] The adaptive changes according to actual requirements are within the protection scope of the present application.

[0059] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the field, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present description should not be understood as the limitation of the present application.

Claims

1. A hydraulic buffer assembly, characterized in that: include: The oil reservoir includes a mounting base, a first elastic element, and a buffer sleeve disposed within the oil reservoir. The first elastic element is located between the closed end of the oil reservoir and the mounting base. The closed end of the oil reservoir is provided with a first limiting protrusion, and the mounting base is provided with a second limiting protrusion. Both the first limiting protrusion and the second limiting protrusion are used to limit the axial position of the first elastic element. The mounting base and the buffer sleeve are slidably connected to the oil reservoir. The buffer sleeve is used to connect with a piston rod. A fluid flow channel can be formed between the mounting base and the buffer sleeve. Under the action of the piston rod, the buffer sleeve contacts the mounting base to close the fluid flow channel. The buffer sleeve has a tapered sealing surface at one end facing the mounting base. Under the action of the piston rod, the cross-sectional dimension of the fluid flow channel gradually decreases as the buffer sleeve moves toward the mounting base. It also includes a second elastic element, which is located between the mounting base and the buffer sleeve; Compression condition: Under external load, the piston rod moves, pushing the buffer sleeve towards the mounting base. While the buffer sleeve compresses the second elastic element, the conical sealing surface of the buffer sleeve gradually closes the fluid flow channel. When the fluid flow channel is completely closed, the pressure in the oil chamber formed by the oil reservoir, the mounting base, and the buffer sleeve increases significantly, forming a high-pressure chamber. At this time, the piston rod continues to move, compressing the first elastic element. The pressure in the oil chamber formed by the oil reservoir, the mounting base, and the buffer sleeve rises sharply, and the hydraulic resistance increases significantly, achieving stepwise absorption of impact energy. Recovery condition: After the external load is released, the piston rod moves away from the mounting base. The first elastic element releases its stored energy, pushing the mounting base back towards the piston rod. The second elastic element provides auxiliary rebound force. The second elastic element pushes the buffer sleeve away from the mounting base, opening the fluid flow channel. As the buffer sleeve moves, the fluid flow channel gradually enlarges, and the oil flows back to the piston rod cavity through the fluid flow channel, restoring the system to standby state.

2. The hydraulic buffer assembly according to claim 1, characterized in that: The closed end of the oil reservoir is provided with a fixed cover, and the fixed cover is provided with the first limiting protrusion. The first limiting protrusion and the closed end of the oil reservoir form a first limiting groove. One end of the first elastic element is located in the first limiting groove. The first limiting groove is used to limit the radial position of the first elastic element.

3. The hydraulic buffer assembly according to claim 1, characterized in that: The second limiting protrusion forms a second limiting groove, and the other end of the first elastic element is located in the second limiting groove. The second limiting groove is used to limit the radial position of the first elastic element.

4. The hydraulic buffer assembly according to claim 2, characterized in that: The fixed cover is detachably connected to the closed end of the oil reservoir, and the fixed cover and the oil reservoir are coaxially arranged.

5. The hydraulic buffer assembly according to claim 1, characterized in that: A sealing structure is provided between the mounting base and the oil storage tank, and between the buffer sleeve and the oil storage tank.

6. The hydraulic buffer assembly according to claim 1, characterized in that: There are at least two second elastic elements, which are evenly distributed along the circumference of the mounting base.

7. The hydraulic buffer assembly according to claim 1, characterized in that: The oil reservoir, the first elastic element, the mounting base, and the buffer sleeve are all coaxially arranged.

8. A vibration damper, characterized in that: Includes the hydraulic buffer assembly as described in any one of claims 1-7.

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