Front reduction hydraulic buffering mechanism

Abstract

The utility model discloses a front reduction hydraulic buffer mechanism in the technical field of shock absorbers, which comprises a working cylinder and a front reduction hydraulic buffer arranged in the working cylinder, the buffer is formed by stacking a plurality of layers of annular limiting units along the axial direction, a U-shaped shock absorption unit is arranged between adjacent units, and a stepped hole or a flow guide hole with a large outside and a small inside is arranged on each U-shaped unit. And oil flow is disturbed through uniform bulges on the side wall. The peripheral wall of the buffer is of a wave-shaped structure and forms a buffer cavity with the inner wall of the working cylinder so as to optimize energy absorption. The guide sleeve assembly is clamped with the buffer through a bottom radial flange, and dynamic sealing is achieved through an annular sealing groove and a sealing ring. The connecting rod supporting seat is of a step-shaped cylindrical structure, stably supports the piston rod and is adaptive to multiple specifications. The automobile bumper can effectively disperse impact energy, restrain turbulent flow, improve buffering efficiency, prolong service life and improve driving and riding comfort.

Description

TECHNICAL FIELD

[0001] The utility model relates to shock absorber technical field, concretely it relates to a front liquid reduction hydraulic buffer mechanism. BACKGROUND

[0002] At present in the field of automobile, shock absorber is the important part of guaranteeing driving safety and comfort, and the front liquid reduction hydraulic buffer mechanism plays a key role, and its core function is to absorb the energy generated in the vehicle driving due to the road pit or external impact to improve the driving stability and improve the driving comfort.

[0003] However, the existing front liquid reduction hydraulic buffer mechanism still has many limitations, on the one hand, the structure is single, the existing front liquid reduction hydraulic buffer mechanism adopts simple hydraulic chamber matched with piston structure, which can meet the general buffering demand in daily driving, but in the complex road conditions with many pits and frequent bumps, the buffer cavity cannot effectively realize the multi-stage dispersion and buffering of impact energy, resulting in significant decline of buffering effect, high-strength impact is easy to exceed the bearing range of the buffer, not only weakening the buffering effect, but also aggravating the wear of other parts of the suspension system, shortening the service life of the suspension system.

[0004] On the other hand, the oil flow control is insufficient, the existing front liquid reduction hydraulic buffer mechanism lacks fine regulation mechanism, and the oil in the buffer is easy to appear turbulent flow or uneven flow when impacted, similar to the rapid and unstable state of water flow in the blocked pipeline, such turbulent flow will directly affect the response speed of the buffer, making it difficult to respond to the impact in time, especially when the vehicle vibrates frequently, the problem of poor oil flow control is more prominent, resulting in sharp decline of the buffer performance, and it is difficult to guarantee the driving comfort. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a front liquid reduction hydraulic buffer mechanism to solve the technical problems of single structure, poor buffering, slow response and performance decline in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a front liquid reduction hydraulic buffer mechanism, which comprises a working cylinder, a front liquid reduction hydraulic buffer is arranged in the working cylinder, the front liquid reduction hydraulic buffer is composed of a plurality of annular limiting units along the axial direction, U-shaped damping units are arranged between each annular limiting unit, and through holes for oil flow are formed in the U-shaped damping units.

[0008] The outer peripheral wall of the front liquid reduction hydraulic buffer is in a wave shape, and a buffer cavity is formed between the front liquid reduction hydraulic buffer and the inner wall of the working cylinder.

[0009] The guide sleeve assembly at the bottom is connected with the front liquid pressure reducing buffer; and the bottom of the front liquid pressure reducing buffer is provided with a connecting rod support seat for supporting the piston rod.

[0010] The through hole is any one of a stepped hole or a flow guide hole, and the hole diameter of the outer wall of the through hole is larger than the hole diameter of the inner wall.

[0011] The outer peripheral contour size of the U-shaped damping unit is smaller than the outer peripheral contour size of the annular limiting unit.

[0012] The side wall of the U-shaped damping unit is provided with a plurality of protrusions which are uniformly distributed along the circumference and are used for disturbing the flow of oil.

[0013] The bottom of the guide sleeve assembly is provided with a radial flange, and the radial flange and the outer peripheral wall of the annular limiting unit at the top end of the front liquid pressure reducing buffer form a clamping structure.

[0014] The inner side wall of the radial flange and the outer side wall of the annular limiting unit are provided with an annular sealing groove, and the annular sealing groove is provided with a detachable sealing ring.

[0015] The connecting rod support seat is a stepped cylindrical structure, the large-diameter section is connected with the bottom of the front liquid pressure reducing buffer, and the small-diameter section is sleeved on the end of the piston rod.

[0016] The front liquid pressure reducing buffer is made of a thermoplastic polyester elastomer material.

[0017] In summary, the utility model has the following beneficial effects:

[0018] The utility model discloses a multistage buffer structure formed by the multilayer annular limiting unit and the U-shaped damping unit, which can effectively disperse and absorb the impact energy of the vehicle under complex road conditions, and show more excellent buffer performance under high-intensity impact. The buffer cavity formed by the wave-shaped structure of the outer peripheral wall of the buffer and the inner wall of the working cylinder can further optimize the energy absorption efficiency. The U-shaped damping unit adopts the structure that the outer peripheral contour size is smaller than the annular limiting unit, the stepped hole or the flow guide hole structure is used for the through hole, the oil flow is controlled through the large inner small hole diameter, the protrusions uniformly distributed on the side wall disturb the oil flow, effectively inhibit the turbulence phenomenon, ensure that the oil still maintains the stable flow path under high-frequency vibration, and enhance the structural stability of the buffer cavity, and optimize the oil flow characteristics.

[0019] In addition, the radial flange at the bottom of the guide sleeve assembly and the outer circumferential wall of the annular limiting unit form a clamping structure, combined with the sealing ring in the annular sealing groove, the reliability and sealing property of the connection are ensured, oil leakage is prevented, and assembly and maintenance are facilitated; the connecting rod support seat adopts a stepped cylindrical structure, stably supports the piston rod and is suitable for various specifications of piston rods, and the universality and adaptability of the mechanism are enhanced; the front liquid reduction hydraulic buffer is designed through the above structure, effectively improves the buffering effect and response speed, prolongs the service life, reduces the wear of other parts of the suspension system, and improves the reliability and practicality of the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 is a schematic diagram of the structure of the front liquid reduction hydraulic buffer of the utility model;

[0022] Figure 3 is a schematic diagram of the local structure of the utility model.

[0023] Reference signs: 1, working cylinder; 2, guide sleeve assembly; 3, connecting rod support seat; 10, front liquid reduction hydraulic buffer; 11, buffer cavity; 21, radial flange; 101, annular limiting unit; 102, U-shaped damping unit; 112, protrusion; 121, through hole; 123, annular sealing groove. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail below in combination with the drawings.

[0025] The purpose, scheme and advantages of the utility model are made clearer and more apparent, and the utility model will be further described in detail below in combination with the embodiments and drawings, and the schematic embodiment and the description thereof of the utility model are only used for explaining the utility model and do not serve as the limitation of the utility model.

[0026] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, it is apparent to those skilled in the art that the specific details need not be used to implement the utility model. In other embodiments, in order to avoid obscuring the utility model, well-known structures, circuits, materials or methods are not specifically described.

[0027] In the description of the utility model, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does 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 limiting the protection scope of the utility model.

[0028] The utility model is described below in combination with the drawings of the utility model Figures 1-3 The embodiments of the utility model are described in detail.

[0029] Embodiment 1:

[0030] This embodiment provides a front hydraulic pressure reduction buffer mechanism, referring to Figures 1-3 , comprising the working cylinder 1, the inside of working cylinder 1 is equipped with front hydraulic pressure reduction buffer 10, front hydraulic pressure reduction buffer 10 is by multilayer annular limiting unit 101 along the axial superposition and is constituted, U-shaped damping unit 102 is arranged between each layer annular limiting unit 101, and the through hole 121 for oil liquid flow through is set up on U-shaped damping unit 102, the outer peripheral wall of front hydraulic pressure reduction buffer 10 is in the shape of a wave, and the buffer cavity 11 is formed between front hydraulic pressure reduction buffer 10 and the inner wall of working cylinder 1.

[0031] During the driving of the automobile, when the wheel encounters road surface protrusions, depressions and other impacts, the impact force is transmitted to the front hydraulic pressure reduction buffer 10 through the piston rod. The multilayer superposition structure realizes multi-stage buffering, the annular limiting unit 101 and the U-shaped damping unit 102 cooperate to disperse energy, the wave-shaped outer peripheral wall expands the volume change range of the buffer cavity 11, optimizes energy absorption, the through hole 121 assists oil flow, makes the buffering process more smooth, can effectively improve the buffering performance, multi-stage buffering can cope with different intensity impacts, optimized energy absorption and oil flow control, enhances the stability and reliability of the buffering mechanism, prolongs the service life, at the same time improves the driving comfort and vehicle driving safety. And the front hydraulic pressure reduction buffer 10 can be made of thermoplastic polyester elastomer TPEE material, the U-shaped damping unit 102 is made of elastic material by the double mechanism of the hydraulic damping effect of throttling energy consumption generated by oil flow through the through hole 121, absorbs impact kinetic energy;

[0032] Further, the working cylinder 1 is provided with a guide sleeve assembly 2 at the port for cooperating connection with the oil storage cylinder, and the bottom of the guide sleeve assembly 2 is connected with the front hydraulic pressure reduction buffer 10; the bottom of the front hydraulic pressure reduction buffer 10 is provided with a connecting rod support seat 3 for supporting the piston rod. The guide sleeve assembly 2 is tightly connected with the port of the working cylinder 1 in a clamping, threaded or other fastening connection mode, and when the piston rod extends and retracts, the inner wall of the guide sleeve assembly 2 can provide smooth sliding support for the piston rod, ensuring linear movement of the piston rod along the axial direction, avoiding the problems of increased frictional resistance or sealing failure caused by lateral force. The connecting rod support seat 3 is firmly fixed at the bottom of the front hydraulic pressure reduction buffer 10 by bolts or other means, providing a precise fulcrum for the piston rod. Under the action of impact load, the support seat 3 can not only bear the axial force of the piston rod, but also effectively suppress the radial deformation of the buffer 10 by virtue of its rigid structure, ensuring stable oil flow path, thereby significantly improving the buffering efficiency.

[0033] Embodiment 2:

[0034] This embodiment is based on the above-mentioned embodiments, and as shown in Figure 1 、 Figure 2 In this embodiment, the through hole 121 is any one of a stepped hole or a flow guide hole, and the hole diameter of the outer wall of the through hole 121 is larger than that of the inner wall.

[0035] At the initial stage of impact, the larger outer wall hole diameter of the through hole 121 in the U-shaped damping unit 102 allows oil to quickly flow into the through hole 121, avoiding blockage of oil flow due to too small hole diameter, and ensuring that the front hydraulic pressure reduction buffer 10 quickly responds to impact; as the oil flows to the inner wall of the through hole 121 with smaller hole diameter, the flow rate increases and the oil flow resistance increases, generating a damping effect in the buffer cavity 11 and converting impact energy into heat energy consumed by oil flow. Through the size and hole diameter structure of the through hole 121, the oil flow is controlled in stages, which not only ensures the quick response of the front hydraulic pressure reduction buffer 10 to impact at the initial stage of impact, but also effectively absorbs and disperses impact energy by using the flow damping of oil in the through hole 121 and the buffer cavity 11, suppresses oil turbulence, and improves the overall performance and stability of the buffer mechanism.

[0036] Embodiment 3:

[0037] This embodiment is based on the above-mentioned embodiments, and as shown in Figure 1 、 Figure 2As shown, in this embodiment, the outer peripheral contour size of the U-shaped damping unit 102 is smaller than that of the annular limiting unit 101. On the one hand, the oil flow path is optimized, so that the hydraulic oil in the buffer cavity 11 flows smoothly through the through hole 121 on the U-shaped damping unit 102, reducing local resistance, improving hydraulic damping efficiency and buffering performance; on the other hand, the interference between the U-shaped damping unit 102 and the inner wall of the working cylinder 1 is avoided, reducing the risk of motion jamming and vibration transmission, and improving the reliability of the mechanism operation. At the same time, the smaller outer peripheral contour realizes the lightweight and material saving of the front hydraulic buffer 10, which is convenient for installation and maintenance and also enhances the flexibility of adapting to different specifications of the working cylinder 1.

[0038] Embodiment 4:

[0039] This embodiment is based on the above-mentioned embodiments, please refer to Figure 2 In this embodiment, the side wall of the U-shaped damping unit (102) is provided with a plurality of protrusions (112) uniformly distributed along the circumference for disturbing the flow of oil. The principle is to generate turbulent flow effect by changing the oil flow path, enhancing the hydraulic damping effect. When the piston rod moves, the protrusions 112 disturb the flow direction of the oil, increase the viscous dissipation, improve the damping force and effectively absorb the impact kinetic energy. Not only can it improve the buffering performance, but also can provide stable damping force in high-speed and low-speed working conditions; secondly, it improves the dynamic response characteristics, reduces the cavitation phenomenon, enhances the system stability, and avoids the amplification of vibration caused by periodic impact.

[0040] Embodiment 5:

[0041] This embodiment is based on the above-mentioned embodiments, please refer to Figure 1 , Figure 3 In this embodiment, the bottom of the guide sleeve assembly 2 is provided with a radial flange 21, and the radial flange 21 and the outer peripheral wall of the annular limiting unit 101 at the top end of the front hydraulic buffer 10 form a clamping structure. This structure realizes the stable connection of the guide sleeve assembly 2 and the front hydraulic buffer 10 through the cooperation of the radial flange 21 and the annular limiting unit 101, effectively prevents the buffer from moving axially, ensures the stability of the mechanism operation; at the same time, it simplifies the assembly process, does not need additional fixing device, reduces the cost and is convenient for maintenance and disassembly; in addition, the clamping structure enhances the sealing performance, cooperates with the original sealing ring of the guide sleeve assembly to prevent hydraulic oil from leaking, and maintains the stability of oil pressure; its positioning function can also ensure the accurate centering of the buffer in the working cylinder, reduce eccentric friction and abnormal wear.

[0042] Further, an annular sealing groove 123 is arranged between the inner side wall of the radial flange 21 and the outer side wall of the annular limiting unit 101, and a detachable sealing ring is arranged in the annular sealing groove 123, so that the sealing member can be regularly checked and replaced, and the annular sealing groove 123 can be disassembled by using a flat screwdriver or other disassembling tools. In the embodiment, the sealing ring is moderately deformed in the high-pressure oil environment by using the geometric constraint of the annular sealing groove 123, so that the sealing performance is ensured and material fatigue failure caused by excessive extrusion is avoided.

[0043] Embodiment 6:

[0044] In the embodiment, the connecting rod support seat 3 is a stepped cylindrical structure, the large-diameter section of which is connected with the bottom of the front hydraulic liquid reduction buffer 10, and the small-diameter section is sleeved on the end of the piston rod. The large-diameter section is rigidly connected with the front hydraulic liquid reduction buffer 10 through a flange or a thread, so as to provide sufficient bearing area to disperse impact load, and the stepped shaft shoulder naturally forms a limiting structure to prevent the piston rod from being pulled out and to enhance the anti-yaw capability. The small-diameter section is precisely sleeved on the end of the piston rod, so as to reduce the mass of the moving part to reduce the inertia effect, to optimize the mechanical transmission efficiency through the variable-diameter structure to improve the dynamic response speed of the buffer, and to reduce the material consumption while ensuring the strength to realize light weight.

[0045] The side wall of the U-shaped damping unit 102 is provided with a plurality of protrusions 112 which are uniformly distributed along the circumference and are used for disturbing the flow of oil.

[0046] The above specific embodiments further specifically describe the purpose, technical scheme and advantages of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A pre-hydraulic pressure reduction damping mechanism comprising a working cylinder (1), characterized in that, The working cylinder (1) is internally provided with a front hydraulic pressure reducing buffer (10), which is composed of multiple layers of annular limiting units (101) stacked along the axial direction; U-shaped damping units (102) are arranged between each layer of annular limiting units (101), and through holes (121) for oil flow are formed in the U-shaped damping units (102). The outer peripheral wall of the front hydraulic pressure reducing buffer (10) is in a wavy structure, and a buffer cavity (11) is formed between the front hydraulic pressure reducing buffer (10) and the inner wall of the working cylinder (1). A guide sleeve assembly (2) for cooperating with the oil storage cylinder is arranged at the port of the working cylinder (1), and the bottom of the guide sleeve assembly (2) is connected with the front hydraulic pressure reducing buffer (10); the bottom of the front hydraulic pressure reducing buffer (10) is provided with a connecting rod support seat (3) for supporting the piston rod.

2. The pre-fluid-pressure-damping mechanism according to claim 1, characterized by The through hole (121) is any one of a stepped hole or a flow guide hole, and the hole diameter of the outer wall of the through hole (121) is larger than the hole diameter of the inner wall.

3. The pre-fluid-pressure-dampening mechanism according to claim 2, characterized by The outer peripheral contour size of the U-shaped damping unit (102) is smaller than the outer peripheral contour size of the annular limiting unit (101).

4. The pre-fluid-pressure-dampening mechanism according to claim 3, characterized by The side wall of the U-shaped damping unit (102) is provided with multiple protrusions (112) uniformly distributed along the circumference for disturbing the flow of oil.

5. The pre-fluid compression damping mechanism according to claim 1, characterized by The bottom of the guide sleeve assembly (2) is provided with a radial flange (21), which forms a clamping structure with the outer peripheral wall of the annular limiting unit (101) at the top end of the front hydraulic pressure reducing buffer (10).

6. The pre-fluid-pressure-dampening mechanism according to claim 5, characterized by The inner side wall of the radial flange (21) and the outer side wall of the annular limiting unit (101) are provided with an annular sealing groove (123), and a detachable sealing ring is arranged in the annular sealing groove.

7. The pre-fluid compression damping mechanism according to claim 1, characterized by The connecting rod support seat (3) is in a stepped cylindrical structure, the large diameter section of which is connected with the bottom of the front hydraulic pressure reducing buffer (10), and the small diameter section is sleeved on the end of the piston rod.

8. The pre-fluid-pressure-dampening mechanism according to any one of claims 1 to 7, characterized in that The front hydraulic pressure reducing buffer (10) is made of thermoplastic polyester elastomer material.

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