Hydraulic buffer assembly and shock absorber

Abstract

The invention 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 barrel, a mounting seat, a first elastic element and a buffering sleeve, the mounting seat, the first elastic element and the buffering sleeve are arranged in the oil storage barrel, and the first elastic element is located between the closed end of the oil storage barrel and the mounting seat; the installation base and the buffering sleeve are both connected with the oil storage cylinder in a sliding mode, the buffering sleeve is used for being connected with a piston rod, a liquid flow channel can be formed between the installation base and the buffering sleeve, and under the action of the piston rod, the buffering sleeve makes contact with the installation base so that the liquid flow channel can be closed. The shock absorber comprises the hydraulic buffer assembly. According to the hydraulic buffering assembly and the shock absorber, the problem that when an existing shock absorber conducts hydraulic buffering, a relatively long stroke needs to be occupied to achieve effective impact absorption and energy conversion is solved.

Description

Technical Field

[0001] This invention relates to the field of vibration damper technology, and in particular to a hydraulic buffer assembly and a vibration damper. Background Art

[0002] Conventional shock absorbers often require a relatively long stroke to achieve effective shock absorption and energy conversion during hydraulic damping, thus placing high demands on their design. To ensure stable operation of the shock absorber in various complex working environments, key parameters such as hydraulic oil flow resistance, piston area, and channel dimensions need to be precisely calculated and controlled. Furthermore, the impact of temperature changes on the hydraulic oil and potential hydraulic oil degradation after prolonged use must be considered, as these issues can affect the shock absorber's efficiency and lifespan.

[0003] Traditional hydraulic damping devices are limited by their finite stroke design, which makes them prone to stroke saturation under impact loads. This leads to nonlinear distortion of the damper's damping characteristic curve, making it difficult to achieve effective energy dissipation and pressure gradient optimization, thus affecting the system's damping and pressure reduction performance. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic buffer assembly and a shock absorber, which solves the problem that existing shock absorbers require a relatively long stroke to achieve effective impact absorption and energy conversion when performing hydraulic buffering.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a hydraulic buffer assembly, comprising: an oil reservoir, 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. Both the mounting base and the buffer sleeve are slidably connected to the oil reservoir. The buffer sleeve is used to connect to 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.

[0006] In some specific embodiments, the closed end of the oil reservoir 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 reservoir 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 to limit the axial position of the first elastic element, and the first limiting groove is used to limit the radial position of the first elastic element.

[0007] In some specific embodiments, the mounting base is provided with a second limiting protrusion, which 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 to limit the axial position of the first elastic element, and the second limiting groove is used to limit the radial position of the first elastic element.

[0008] In some specific designs, the fixing cover is detachably connected to the closed end of the oil reservoir, and the fixing cover and the oil reservoir are coaxially arranged.

[0009] In some specific designs, a sealing structure is provided between the mounting base and the oil reservoir, and between the buffer sleeve and the oil reservoir.

[0010] In some specific designs, the end of the buffer sleeve facing the mounting base is provided with a tapered sealing surface. As the buffer sleeve moves toward the mounting base under the action of the piston rod, the cross-sectional dimension of the fluid flow channel gradually decreases.

[0011] In some specific designs, a second elastic element is also included, which is located between the mounting base and the buffer sleeve.

[0012] In some specific embodiments, there are at least two second elastic elements, which are evenly distributed along the circumference of the mounting base.

[0013] In some specific designs, the oil reservoir, the first elastic element, the mounting base, and the buffer sleeve are all coaxially arranged.

[0014] The present invention also provides a shock absorber, including the aforementioned hydraulic buffer assembly.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention significantly increases the damper's buffer stroke through the design of the first elastic element, resulting in a smoother and more linear change in the buffer force. Furthermore, by sealing the fluid flow channel through the mounting base and buffer sleeve, the oil pressure within the oil chamber formed by the reservoir, mounting base, and buffer sleeve is significantly increased, creating a high-pressure chamber. This design greatly enhances the buffering effect. Specifically, when subjected to external impact, the first elastic element can compress or rebound accordingly based on the applied pressure. This characteristic allows the hydraulic buffer assembly to distribute impact energy evenly over a longer stroke. Compared to traditional buffer designs, this improvement effectively reduces the occurrence of peak forces, avoiding the risk of potential damage to the damper. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a hydraulic buffer assembly in some embodiments of the present invention. Figure 1 ; Figure 2 for Figure 1 A magnified view of part A; Figure 3 for Figure 1 A magnified view of section B; Figure 4 This is a schematic diagram of a hydraulic buffer assembly in some embodiments of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of a hydraulic buffer assembly in some embodiments of the present invention. Figure 3 ; In the figure: 1-oil reservoir, 2-mounting base, 3-first elastic element, 4-buffer sleeve, 5-fluid 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 Implementation

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a hydraulic buffer assembly and a shock absorber, which solves the problem that existing shock absorbers require a relatively long stroke to achieve effective impact absorption and energy conversion when performing hydraulic buffering.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 like Figures 1 to 5As shown, this embodiment provides a hydraulic buffer assembly, including: an oil reservoir 1, and a mounting base 2, a first elastic element 3, and a buffer sleeve 4 disposed within the oil reservoir 1. The first elastic element 3 is located between the closed end of the oil reservoir 1 and the mounting base 2. Both the mounting base 2 and the buffer sleeve 4 are slidably connected to the oil reservoir 1. The buffer sleeve 4 is used to connect to one end of a piston rod 6. A fluid flow channel 5 can be formed between the mounting base 2 and the buffer sleeve 4. Under the action of the piston rod 6, the buffer sleeve 4 contacts the mounting base 2 to close the fluid flow channel 5. The first elastic element 3 is mainly responsible for absorbing and releasing energy, providing necessary elastic support for vibration reduction. This embodiment considers the load requirements under different working environments to ensure good rebound performance under various stress conditions. The design of the first elastic element 3 in this embodiment can significantly increase the buffer stroke of the vibration damper, thereby making the change in the buffer force value smoother and more linear. Furthermore, by closing the fluid flow channel 5 through the mounting base 2 and the buffer sleeve 4, the oil pressure formed by the oil reservoir 1, the mounting base 2, and the buffer sleeve 4 is significantly increased, forming a high-pressure chamber. This design concept greatly improves the buffering effect. Specifically, when subjected to an external impact, the first elastic element 3 can compress or rebound accordingly based on the applied pressure. This characteristic allows the hydraulic damping assembly to distribute impact energy evenly over a longer stroke. Compared to traditional damping designs, this improvement effectively reduces peak forces and avoids the risk of potential damage to the shock absorber.

[0022] In some specific embodiments, the closed end of the oil reservoir 1 is provided with a fixing cover 7, the fixing cover 7 is provided with a first limiting protrusion 8, the first limiting protrusion 8 and the closed end of the oil reservoir 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.

[0023] In some specific embodiments, the fixing cover 7 is detachably connected to the closed end of the oil reservoir 1, and the fixing cover 7 and the oil reservoir 1 are coaxially arranged. The fixing cover 7 is detachably connected to the closed end of the oil reservoir 1 by bolts. As an important structure during installation, the fixing cover 7 can ensure a stable connection between the first elastic element 3 and the oil reservoir 1.

[0024] In some specific embodiments, the mounting base 2 is provided with a second limiting protrusion 9, which 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, matching 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 base 2 is the supporting foundation for the first elastic element 3 and participates in the transmission and distribution of force. By optimizing the shape of the mounting base 2, pressure can be effectively dispersed, reducing local wear. Through the fluid flow channel 5 formed by the mounting base 2 and the buffer sleeve 4, the compression damping force is reduced, and the rebound damping force is increased, making the shock absorber operation smoother, avoiding rebound impact, and making the vehicle ride more comfortable.

[0025] In some specific embodiments, a sealing structure 10 is provided between the mounting base 2 and the oil reservoir 1, and between the buffer sleeve 4 and the oil reservoir 1, to ensure that the mounting base 2 and the buffer sleeve 4 can seal with the oil reservoir 1 when sliding, thereby preventing oil leakage.

[0026] In some specific embodiments, a conical sealing surface 12 is provided at the end of the buffer sleeve 4 facing the mounting base 2. Under the action of the piston rod 6, during the movement of the buffer sleeve 4 toward the mounting base 2, the cross-sectional size of the liquid flow channel 5 gradually decreases, achieving progressive closure. During the movement of the piston rod 6 in the opposite direction, during the movement of the buffer sleeve 4 away from the mounting base 2, the cross-sectional size of the liquid flow channel 5 gradually increases, achieving progressive opening.

[0027] In some specific embodiments, a second elastic element 11 is also included, which is located between the mounting base 2 and the buffer sleeve 4. The second elastic element 11 can provide a cushioning effect when the buffer sleeve 4 moves toward the mounting base 2, and can provide elastic force when the buffer sleeve 4 moves away from the mounting base 2, so that the fluid flow channel 5 opens.

[0028] In some embodiments, there are at least two second elastic elements 11, which are evenly distributed along the circumference of the mounting base 2 to provide uniform cushioning and elasticity.

[0029] In some specific embodiments, the oil reservoir 1, the fixed cover 7, the first elastic element 3, the mounting base 2, and the buffer sleeve 4 are all coaxially arranged to maintain the stability of the structure throughout the entire working process.

[0030] In some specific embodiments, both the first elastic element 3 and the second elastic element 11 are springs. The first elastic element 3 is made of 55SiCr (silicon-chromium steel) and undergoes induction hardening + medium-temperature tempering + stress shot blasting to improve its tensile strength and corrosion resistance, ensuring durability and fatigue resistance.

[0031] In some specific embodiments, the mounting base 2 is made of A356-T6 aluminum alloy and is manufactured using high vacuum die casting (HPDC) + T6 heat treatment casting or forging processes to ensure that it has sufficient hardness and wear resistance.

[0032] The working process of this embodiment: Compression operation: The piston rod 6 moves under the action of an external load, so as to Figure 1 Taking the direction as a reference, it moves from right to left, pushing the buffer sleeve 4 towards the mounting base 2. While the buffer sleeve 4 compresses the second elastic element 11, the conical sealing surface 12 of the buffer sleeve 4 gradually closes the liquid flow channel 5. When the liquid flow channel 5 is completely closed, the oil pressure in the oil chamber formed by the oil reservoir 1, the mounting base 2 and the buffer sleeve 4 increases significantly, forming a high-pressure chamber. At this time, the piston rod 6 continues to move, compressing the first elastic element 3. The pressure in the oil chamber formed by the oil reservoir 1, the mounting seat 2, and the buffer sleeve 4 rises sharply, and the hydraulic resistance increases significantly, thus achieving the stepwise absorption of impact energy.

[0033] Restoration of working conditions: After the external load is released, that is, the piston rod 6 moves away from the mounting base 2, the first elastic element 3 releases its stored energy and pushes the mounting base 2 to reset in the direction of the piston rod 6, and the second elastic element 11 provides an auxiliary rebound force; The second elastic element 11 pushes the buffer sleeve 4 to move away from the mounting base 2, opening the fluid flow channel. As the buffer sleeve 4 moves, the fluid flow channel 5 gradually increases in size, and the oil flows back to the low-pressure chamber (i.e., the chamber where the piston rod 6 is located) through the fluid flow channel 5, and the system returns to the standby state.

[0034] This embodiment utilizes the compressible stroke of the first elastic element 3 to achieve hydraulic buffering, adjusting the damping force to achieve effective impact absorption and energy conversion. This shortens the buffer stroke, making the buffer force value smoother, resulting in a gentler shock absorber operation, avoiding rebound impacts, and making vehicle driving more comfortable. The radial constraint and axial preload of the first elastic element 3 are achieved through the cooperation of the fixed cover 7 and the mounting base 2, effectively suppressing the dynamic buckling and modal coupling phenomena of the first elastic element 3 under overload conditions. This maintains the dynamic stiffness stability and energy dissipation efficiency of the hydraulic buffer assembly under transient impact loads, significantly improving the critical buckling load of the shock absorber and ensuring optimal force-displacement hysteresis characteristics even under extreme conditions. The opening characteristics of the fluid flow channel 5 allow for nonlinear adjustable range control of the damping force value, thereby optimizing the velocity-damping force gradient curve (FV characteristic curve) of the shock absorber. This valve system adjustment mechanism based on fluid dynamics principles significantly improves the dynamic response characteristics of the shock absorber under various operating conditions, resulting in better linearity and smoothness in the movement of the piston rod 6. In this embodiment, the second elastic element 11 can play a buffering role when the buffer sleeve 4 moves toward the mounting base 2, so that the liquid flow channel 5 gradually closes. When the buffer sleeve 4 moves away from the mounting base 2, it can provide elastic force, so that the liquid flow channel 5 gradually opens.

[0035] Example 2 like Figures 1 to 5 As shown, this embodiment provides a vibration damper, including the hydraulic buffer assembly of Embodiment 1. The first elastic element 3 in this embodiment is mainly responsible for absorbing and releasing energy, providing necessary elastic support for vibration damping. This embodiment considers the load requirements under different working environments, ensuring good rebound performance under various stress conditions. The design of the first elastic element 3 in this embodiment significantly increases the damper's buffer stroke, resulting in a smoother and more linear change in the buffer force value. Furthermore, by sealing the fluid flow channel 5 through the mounting base 2 and the buffer sleeve 4, the oil pressure in the oil chamber formed by the oil reservoir 1, mounting base 2, and buffer sleeve 4 is significantly increased, forming a high-pressure chamber. This design greatly improves the buffering effect. Specifically, when subjected to external impact, the first elastic element 3 can compress or rebound accordingly based on the applied pressure. This characteristic allows the hydraulic buffer assembly to distribute impact energy evenly over a longer stroke. Compared to traditional buffer designs, this improvement effectively reduces the occurrence of peak forces, avoiding the risk of potential damage to the vibration damper.

[0036] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0039] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0040] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0041] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0042] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0043] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0044] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

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 and second limiting protrusions 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.

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: The buffer sleeve has a tapered sealing surface at one end facing the mounting base. As the buffer sleeve moves toward the mounting base under the action of the piston rod, the cross-sectional dimension of the fluid flow channel gradually decreases.

7. The hydraulic buffer assembly according to claim 1, characterized in that: It also includes a second elastic element, which is located between the mounting base and the buffer sleeve.

8. The hydraulic buffer assembly according to claim 7, characterized in that: There are at least two second elastic elements, which are evenly distributed along the circumference of the mounting base.

9. 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.

10. A vibration damper, characterized in that: Includes the hydraulic buffer assembly as described in any one of claims 1-9.

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