Hydraulic damping stop structure inside shock absorber

Abstract

The utility model relates to shock absorber technical field, and disclose a shock absorber internal hydraulic buffer stop structure, including the first cylinder, the first cylinder inner wall top is fixedly connected with the second cylinder, the oil cavity is formed between the first cylinder and the second cylinder, the second cylinder inner wall is provided with buffer stop mechanism. Through buffer stop mechanism realizes double buffering effect. When piston rod drives piston to move downward, second fixed ring moves down with piston, extrudes lift ring, makes buffer spring compression, utilizes the elastic deformation of spring to absorb vibration energy, provides first buffering, when piston continues to move down and approaches limit position, second fixed ring and the rubber block of first fixed ring top contact, the elastic buffer of rubber block further reduces piston descending speed, realizes second buffering. Double buffering mechanism not only effectively reduces vibration transmission, still can prevent piston and cylinder rigid impact under extreme working condition, prolongs shock absorber life.

Description

Technical Field

[0001] This utility model relates to the field of shock absorber technology, specifically to an internal hydraulic buffer stop structure for a shock absorber. Background Technology

[0002] In numerous fields such as automobiles, construction machinery, and aerospace, shock absorbers are key components that ensure stable equipment operation and improve operational comfort and safety. They effectively absorb and buffer the impact forces generated by factors such as uneven road surfaces and mechanical vibrations during equipment operation, reducing vibration damage to equipment components and extending equipment lifespan.

[0003] In practical applications of traditional shock absorbers, when equipment or vehicles encounter significant impact forces (such as severe road bumps or sudden vibrations in industrial equipment), the piston rod of a traditional shock absorber, during its rapid downward movement, is prone to a direct and violent hard collision with the bottom of the cylinder due to the lack of an effective buffering mechanism. This collision not only generates enormous impact noise but also causes serious damage to the internal structure of the shock absorber, such as piston rod deformation, denting or cracking of the cylinder bottom, and even seal rupture leading to hydraulic oil leakage. Once such structural damage occurs, the shock absorber's damping performance will drop sharply, failing to effectively absorb and buffer subsequent vibration energy, thus exacerbating the wear and fatigue of other components and shortening the overall lifespan of the equipment. Furthermore, hard collisions can also cause safety hazards, such as decreased vehicle stability and loss of control in industrial equipment operation. Therefore, the limitations of traditional shock absorbers in dealing with large impact forces have become a key bottleneck restricting their performance improvement and application expansion. Utility Model Content

[0004] The purpose of this invention is to provide an internal hydraulic buffer stop structure for a shock absorber to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an internal hydraulic buffer stop structure for a shock absorber, comprising a first cylinder, a second cylinder fixedly connected to the top of the inner wall of the first cylinder, an oil cavity formed between the first cylinder and the second cylinder, a sealing block fixedly connected to the top of the first cylinder, a piston rod provided at the top of the sealing block, a piston fixedly connected to the bottom of the piston rod, a buffer stop mechanism provided on the inner wall of the second cylinder, and a hydraulic shock absorption mechanism provided near the bottom of the inner wall of the second cylinder;

[0006] The buffer stop mechanism includes a first fixed ring, which is fixedly connected to the inner wall of the first cylinder. Guide rods are arranged in a circular array at equal intervals at the bottom of the first fixed ring. Limiting rings are fixedly connected to the surface of the guide rods near the bottom end. Lifting rings are fixedly connected to the top of the guide rods. A buffer spring is sleeved between the first fixed ring and the lifting ring on the surface of the guide rods. A second fixed ring corresponding to the lifting ring is fixedly connected to the bottom of the piston. Rubber blocks are fixedly connected in a circular array at equal intervals at the top of the first fixed ring.

[0007] Preferably, the top of the sealing block has a hole that matches the piston rod, and the surface of the piston rod passes through and slides up and down in the hole, while the surface of the piston rod slides up and down in connection with the inner wall of the second cylinder.

[0008] Preferably, the bottom of the first fixing ring has a hole that matches the guide rod, and the guide rod is slidably connected to the hole through the surface of the guide rod. One end of the buffer spring is fixedly connected to the top of the first fixing ring, and the other end of the buffer spring is fixedly connected to the bottom of the lifting ring.

[0009] Preferably, the hydraulic damping mechanism includes a fixed seat, which is fixedly connected to the inner wall of the second cylinder near the bottom. A fixed rod is provided at the top of the fixed seat, and a fixed plate is fixedly connected to the top of the fixed rod. A first sliding plate is slidably connected to the surface of the fixed plate. A first spring is fitted between the fixed plate and the first sliding plate on the surface of the fixed rod. A first oil hole is opened at the top of the fixed seat near the inner wall of the second cylinder. A second sliding plate is slidably connected to the surface of the fixed rod. A second spring is fitted between the bottom of the inner wall of the second cylinder and the second sliding plate on the surface of the fixed rod. A second oil hole is opened at the top of the fixed seat near the fixed rod, and a third oil hole is opened at the bottom of the inner wall of the second cylinder.

[0010] Preferably, the top of the fixing seat has a hole that matches the fixing rod, and the surface of the fixing rod passes through and is fixedly connected to the hole. The bottom end of the fixing rod is fixedly connected to the bottom of the inner wall of the second cylinder. The bottom of the first sliding plate is in contact with the top of the fixing seat to cover the first oil hole.

[0011] Preferably, one end of the first spring is fixedly connected to the bottom of the fixed disk, and the other end of the first spring is fixedly connected to the top of the fixed base. The top of the first sliding disk has a hole that matches the second oil hole.

[0012] Preferably, the top of the second sliding disk is in contact with the bottom of the fixed seat to cover the second oil hole, one end of the second spring is fixedly connected to the bottom of the inner wall of the second cylinder, and the other end of the second spring is fixedly connected to the bottom of the second sliding disk.

[0013] Compared with the prior art, this utility model provides an internal hydraulic buffer stop structure for a shock absorber, which has the following beneficial effects:

[0014] 1. The shock absorber features an internal hydraulic buffer stop structure that achieves a dual buffering effect. When the piston rod drives the piston downwards, the second fixed ring moves downwards with the piston, compressing the lifting ring and causing the buffer spring to compress. The elastic deformation of the spring absorbs vibration energy, providing the first buffering effect. When the piston continues to move downwards and approaches its limit position, the second fixed ring contacts the rubber block at the top of the first fixed ring. The elastic buffering of the rubber block further reduces the piston's descent speed, achieving a second buffering effect. This dual buffering mechanism not only effectively reduces vibration transmission but also prevents the piston from colliding hard with the cylinder under extreme conditions, extending the shock absorber's service life.

[0015] 2. The internal hydraulic buffer stop structure of this shock absorber, through the combination of a fixed seat, a fixed rod, a first sliding plate, a second sliding plate, a first oil hole, a second oil hole, and a third oil hole, achieves precise flow control of hydraulic oil. During the piston rod movement, the hydraulic oil generates damping force through the throttling effect of the oil holes, effectively absorbing vibration energy and improving the shock absorption effect. By adjusting the preload of the first and second springs, the motion characteristics of the first and second sliding plates can be changed, thereby adjusting the opening degree of the first and second oil holes and the flow speed of the hydraulic oil, achieving adjustable damping force to meet the shock absorption requirements under different working conditions. Attached Figure Description

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

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 This is a three-dimensional cross-sectional view of the surface of the first and second cylinders of the present invention.

[0019] Figure 3 This is a three-dimensional schematic diagram of the buffer stop mechanism of this utility model;

[0020] Figure 4 This is a three-dimensional schematic diagram of the first fixing ring and the limiting ring of the present invention.

[0021] Figure 5 This is a three-dimensional schematic diagram of the structural fixing base and fixing plate of this utility model;

[0022] Figure 6 This is a three-dimensional disassembled schematic diagram of the hydraulic shock absorption mechanism of this utility model.

[0023] In the diagram: 1. First cylinder; 2. Second cylinder; 3. Oil chamber; 4. Sealing block; 5. Piston rod; 6. Piston; 7. Buffer stop mechanism; 71. First fixing ring; 72. Guide rod; 73. Limiting ring; 74. Lifting ring; 75. Buffer spring; 76. Second fixing ring; 77. Rubber block; 8. Hydraulic damping mechanism; 81. Fixed seat; 82. Fixed rod; 83. Fixed plate; 84. First sliding plate; 85. First spring; 86. First oil hole; 87. Second sliding plate; 88. Second spring; 89. Second oil hole; 811. Third oil hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] This utility model provides the following technical solution:

[0027] Example 1

[0028] Please see Figure 1-4 This utility model provides a technical solution: a hydraulic buffer stop structure inside a shock absorber, including a first cylinder 1, a second cylinder 2 fixedly connected to the top of the inner wall of the first cylinder 1, an oil cavity 3 formed between the first cylinder 1 and the second cylinder 2, a sealing block 4 fixedly connected to the top of the first cylinder 1, a piston rod 5 provided on the top of the sealing block 4, a piston 6 fixedly connected to the bottom of the piston rod 5, a buffer stop mechanism 7 provided on the inner wall of the second cylinder 2, and a hydraulic shock absorption mechanism 8 provided near the bottom of the inner wall of the second cylinder 2;

[0029] The buffer stop mechanism 7 includes a first fixed ring 71, which is fixedly connected to the inner wall of the first cylinder 1. Guide rods 72 are equidistantly arranged in a circular array at the bottom of the first fixed ring 71. Limiting rings 73 are fixedly connected to the surface of the guide rods 72 near the bottom. Lifting rings 74 are fixedly connected to the top of the guide rods 72. Buffer springs 75 are sleeved between the first fixed ring 71 and the lifting ring 74 on the surface of the guide rods 72. A second fixed ring 76 corresponding to the lifting ring 74 is fixedly connected to the bottom of the piston 6. Rubber blocks 77 are fixedly connected in a circular array at equal intervals at the top of the first fixed ring 71.

[0030] The top of the sealing block 4 has a hole that matches the piston rod 5, and the surface of the piston rod 5 passes through and slides up and down in the hole, while the surface of the piston 6 slides up and down in connection with the inner wall of the second cylinder 2.

[0031] The bottom of the first fixing ring 71 has a hole that matches the guide rod 72, and the guide rod 72 passes through the surface and slides up and down in the hole. One end of the buffer spring 75 is fixedly connected to the top of the first fixing ring 71, and the other end of the buffer spring 75 is fixedly connected to the bottom of the lifting ring 74.

[0032] Example 2

[0033] Please see Figure 5-6 Furthermore, based on Example 1, a hydraulic shock absorption mechanism 8 was obtained.

[0034] The hydraulic shock absorption mechanism 8 includes a fixed seat 81, which is fixedly connected to the inner wall of the second cylinder 2 near the bottom. A fixed rod 82 is provided on the top of the fixed seat 81, and a fixed plate 83 is fixedly connected to the top of the fixed rod 82. A first sliding plate 84 is slidably connected to the surface of the fixed plate 83. A first spring 85 is fitted on the surface of the fixed rod 82 between the fixed plate 83 and the first sliding plate 84. A first oil hole 86 is opened on the top of the fixed seat 81 near the inner wall of the second cylinder 2. A second sliding plate 87 is slidably connected to the surface of the fixed rod 82. A second spring 88 is fitted on the surface of the fixed rod 82 between the bottom of the inner wall of the second cylinder 2 and the second sliding plate 87. A second oil hole 89 is opened on the top of the fixed seat 81 near the fixed rod 82, and a third oil hole 811 is opened on the bottom of the inner wall of the second cylinder 2.

[0035] The top of the fixed base 81 has a hole that matches the fixed rod 82, and the surface of the fixed rod 82 passes through and is fixedly connected to the hole. The bottom end of the fixed rod 82 is fixedly connected to the bottom of the inner wall of the second cylinder 2. The bottom of the first sliding plate 84 is in contact with the top of the fixed base 81 to cover the first oil hole 86.

[0036] One end of the first spring 85 is fixedly connected to the bottom of the fixed plate 83, and the other end of the first spring 85 is fixedly connected to the top of the fixed base 81. The top of the first sliding plate 84 has a hole that matches the second oil hole 89.

[0037] The top of the second sliding disk 87 fits against the bottom of the fixed seat 81, covering the second oil hole 89. One end of the second spring 88 is fixedly connected to the bottom of the inner wall of the second cylinder 2, and the other end of the second spring 88 is fixedly connected to the bottom of the second sliding disk 87.

[0038] In actual operation, when this device is in use and the shock absorber is not subjected to external force, the piston 6 is in its initial position inside the second cylinder 2, and the piston rod 5 is in a naturally extended state. The oil chamber 3 between the first cylinder 1 and the second cylinder 2, as well as the interior of the second cylinder 2, is filled with hydraulic oil, and the system is in a static equilibrium state. The sealing block 4 ensures the sealing between the piston rod 5 and the first cylinder 1, preventing hydraulic oil leakage. When the piston rod 5 is subjected to a downward external force, the piston 6 slides downward along the inner wall of the second cylinder 2, pushing the hydraulic oil inside the second cylinder 2 downward. The second fixed ring 76 at the bottom of the piston 6 gradually approaches the lifting ring 74 of the buffer stop mechanism 7. When the second fixed ring 76 contacts the lifting ring 74, the lifting ring 74 moves downward along the guide rod 72, compressing the buffer spring 75. The buffer spring 75 absorbs part of the impact energy, slowing down the movement speed of the piston rod 5. If the external force is too great, the lifting ring 74 continues to move downwards to the limiting ring 73. The limiting ring 73 prevents the lifting ring 74 from moving further, thereby limiting the stroke of the piston rod 5 and preventing the piston 6 from colliding hard with the bottom of the second cylinder 2. When the external force disappears or decreases, the elastic force of the buffer spring 75 pushes the lifting ring 74 back to its original position, causing the second fixed ring 76 and the piston 6 to move upwards and return to the initial state. At the same time, the rubber block 77 at the top of the first fixed ring 71 plays an auxiliary buffering role during the buffering process, reducing impact noise and vibration.

[0039] When piston rod 5 drives piston 6 downward, the hydraulic oil in the second cylinder 2 is compressed. The hydraulic oil enters the lower part of the fixed seat 81 through the second oil hole 89 at the top of the fixed seat 81. The second sliding plate 87 moves downward due to the downward thrust of the hydraulic oil. Then, the hydraulic oil enters the oil chamber 3 through the third oil hole 811. When piston rod 5 drives piston 6 upward, the hydraulic oil in the second cylinder 2 flows upward, pushing the second sliding plate 87 upward to reset and cover the second oil hole 89, reducing the hydraulic oil return speed. This design makes the damping force in the rebound stroke greater than that in the compression stroke, effectively controlling the rebound speed of piston rod 5 and preventing instability caused by excessive rebound. The hydraulic oil will pass through the top of the fixed seat 81 and flow upward through the first oil hole 86, simultaneously pushing the first sliding plate 84 upward, exposing the first oil hole 86, thus allowing the hydraulic oil to flow back into the second cylinder 2.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A hydraulic buffer stop structure inside a shock absorber, comprising a first cylinder (1), characterized in that: A second cylinder (2) is fixedly connected to the top of the inner wall of the first cylinder (1), and an oil cavity (3) is formed between the first cylinder (1) and the second cylinder (2). A sealing block (4) is fixedly connected to the top of the first cylinder (1), and a piston rod (5) is provided on the top of the sealing block (4). A piston (6) is fixedly connected to the bottom end of the piston rod (5). A buffer stop mechanism (7) is provided on the inner wall of the second cylinder (2), and a hydraulic shock absorption mechanism (8) is provided on the inner wall of the second cylinder (2) near the bottom. The buffer stop mechanism (7) includes a first fixed ring (71), which is fixedly connected to the inner wall of the first cylinder (1). The bottom of the first fixed ring (71) is provided with guide rods (72) arranged in a circular array at equal intervals. The surface of the guide rods (72) is fixedly connected to a limit ring (73) near the bottom end. The top of the guide rods (72) is fixedly connected to a lifting ring (74). The surface of the guide rods (72) is sleeved between the first fixed ring (71) and the lifting ring (74). The bottom of the piston is fixedly connected to a second fixed ring (76) corresponding to the lifting ring (74). The top of the first fixed ring (71) is fixedly connected with rubber blocks (77) in a circular array at equal intervals.

2. The hydraulic buffer stop structure inside a shock absorber according to claim 1, characterized in that: The sealing block (4) has a hole at the top that matches the piston rod (5), and the surface of the piston rod (5) is connected to the hole through and slides up and down. The surface of the piston (6) is connected to the inner wall of the second cylinder (2) through and slides up and down.

3. The hydraulic buffer stop structure inside a shock absorber according to claim 1, characterized in that: The bottom of the first fixing ring (71) is provided with a hole that matches the guide rod (72), and the surface of the guide rod (72) is penetrated and slidably connected to the hole. One end of the buffer spring (75) is fixedly connected to the top of the first fixing ring (71), and the other end of the buffer spring (75) is fixedly connected to the bottom of the lifting ring (74).

4. The hydraulic buffer stop structure inside a shock absorber according to claim 1, characterized in that: The hydraulic shock absorption mechanism (8) includes a fixed seat (81), which is fixedly connected to the inner wall of the second cylinder (2) near the bottom. A fixed rod (82) is provided on the top of the fixed seat (81). A fixed plate (83) is fixedly connected to the top of the fixed rod (82). A first sliding plate (84) is slidably connected to the surface of the fixed plate (83). A first spring (85) is fitted between the fixed plate (83) and the first sliding plate (84) on the surface of the fixed rod (82). A first oil hole (86) is opened on the top of the fixed seat (81) near the inner wall of the second cylinder (2). A second sliding plate (87) is slidably connected to the surface of the fixed rod (82). A second spring (88) is fitted between the bottom of the inner wall of the second cylinder (2) and the second sliding plate (87) on the surface of the fixed rod (82). A second oil hole (89) is opened on the top of the fixed seat (81) near the fixed rod (82). A third oil hole (811) is opened on the bottom of the inner wall of the second cylinder (2).

5. The hydraulic buffer stop structure inside a shock absorber according to claim 4, characterized in that: The top of the fixed seat (81) is provided with a hole that matches the fixed rod (82), and the surface of the fixed rod (82) is penetrated and fixedly connected to the hole. The bottom end of the fixed rod (82) is fixedly connected to the bottom of the inner wall of the second cylinder (2), and the bottom of the first sliding plate (84) is in contact with the top of the fixed seat (81).

6. The hydraulic buffer stop structure inside a shock absorber according to claim 4, characterized in that: One end of the first spring (85) is fixedly connected to the bottom of the fixed plate (83), and the other end of the first spring (85) is fixedly connected to the top of the fixed base (81). The top of the first sliding plate (84) is provided with a hole that matches the second oil hole (89).

7. The hydraulic buffer stop structure inside a shock absorber according to claim 4, characterized in that: The top of the second sliding disk (87) is in contact with the bottom of the fixed seat (81), one end of the second spring (88) is fixedly connected to the bottom of the inner wall of the second cylinder (2), and the other end of the second spring (88) is fixedly connected to the bottom of the second sliding disk (87).

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