Shock absorber with built-in limiting and cushioning structure

Abstract

The application discloses a shock absorber with a built-in limiting and buffering structure, which comprises an inner cylinder, an outer cylinder and a piston rod movably arranged in the inner cylinder; one end of the outer cylinder is connected with a base, and the other end is connected with an end cover; a compression valve assembly is arranged at the end of the base adjacent to the inner cylinder, a guide member is arranged at the end of the end cover adjacent to the inner cylinder, a restoring valve assembly is arranged at one end of the piston rod which is adjacent to the compression valve assembly, the piston rod slides out of the guide member and the end cover, a floating piston for buffering the restoring valve assembly at a set position in the extension stroke of the piston rod is arranged in the inner cylinder, and a second spring is arranged between the floating piston and the guide member, the second spring is used for resetting the floating piston to the set position in the retraction stroke of the piston rod and applying a buffering force to the floating piston in the extension stroke of the piston rod.

Description

Technical Field

[0001] This application relates to the field of automotive shock absorber technology, specifically a shock absorber with a built-in limiting buffer structure. Background Technology

[0002] As a crucial component of the vehicle body system, the shock absorber primarily provides vibration damping during vehicle operation. Due to the diverse road conditions encountered during actual driving, especially on unpaved roads with frequent large potholes, the shock absorber often operates at its limit stroke. The return valve assembly on its piston rod is prone to direct impact with the guide components, leading to premature damage to either or both, and consequently, premature shock absorber failure. Therefore, it is necessary to address this issue. Utility Model Content

[0003] The purpose of this application is to provide a vibration damper with a built-in limiting buffer structure to solve the problems in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: a vibration damper with a built-in limiting and buffering structure, comprising an inner cylinder and an outer cylinder, and a piston rod movably passing through the inner cylinder; one end of the outer cylinder is connected to a base, and the other end is connected to an end cap; a compression valve assembly is provided at the end of the base adjacent to the inner cylinder, a guide is provided at the end of the end cap adjacent to the inner cylinder, a return valve assembly is installed at the end of the piston rod facing the compression valve assembly, the piston rod slides through the guide and the end cap, and a floating piston is provided in the inner cylinder for abutting and buffering against the return valve assembly at a set position during the piston rod's extension stroke, and a second spring is provided between the floating piston and the guide, the second spring being used to reset the floating piston to the set position during the piston rod's retraction stroke and to apply a buffering force to the floating piston during the piston rod's extension stroke.

[0005] Furthermore, an annular manifold is formed on the end face of the floating piston facing the recovery valve assembly. A plurality of first flow holes are arranged circumferentially around the floating piston along its own axis. All the first flow holes axially penetrate the floating piston and one end of the first flow holes opens into the manifold. The axes of all the first flow holes form a virtual cone and the small end of the virtual cone faces the recovery valve assembly. An abutment plate for abutting against the floating piston is installed on one end of the recovery valve assembly facing the floating piston. A plurality of second flow holes are opened on the abutment plate. When the abutment plate abuts against the floating piston, the second flow holes are used to form a channel between the manifold and the recovery valve assembly.

[0006] Furthermore, the vibration damper with a built-in limiting and buffering structure also includes a pair of spring seats that are slidably mounted on the outer circular surface of the piston rod. The two opposite end faces of the two spring seats abut against the floating piston and the guide member, respectively. The adjacent end faces of the two spring seats extend axially to form guide cylinder portions. The two end faces of the second spring abut against the end faces of the corresponding spring seats, respectively. The inner diameter surfaces of the two ends of the second spring are respectively sleeved on the corresponding guide cylinder portions.

[0007] Furthermore, the end cap forms a second receiving cavity, and the opening of the second receiving cavity expands radially to form a coaxial first receiving cavity. The outer wall of the first receiving cavity is sealed and fixedly sleeved onto the inner wall of the outer cylinder port. The second receiving cavity is further away from the outer cylinder than the first receiving cavity. An oil seal is installed in the second receiving cavity, and the piston rod is sealed and slidably inserted through the sealing surface of the oil seal and out of the bottom of the second receiving cavity.

[0008] Furthermore, the guide includes an integral flange and an annular platform, the end of the flange is fastened into the first receiving cavity, and the annular platform is connected to the inner cylinder port; the flange end face forms an annular groove, and the first spring is sleeved on the piston rod with its two ends abutting against the oil seal and the annular groove respectively.

[0009] Furthermore, the bottom of the second receiving cavity and the corresponding end of the oil seal are both adapted conical shapes, and a disc-shaped pressure plate covers the end of the oil seal away from the second receiving cavity. The two ends of the first spring abut against the disc-shaped pressure plate and the annular groove, respectively.

[0010] Furthermore, the guide member has a through hole connecting the annular groove and the outer cylinder.

[0011] Furthermore, a protective cover is installed at the outer end of the piston rod. The protective cover is loosely fitted outside the outer cylinder, and the length of the protective cover is adapted to the maximum stroke of the piston rod.

[0012] The beneficial effects of this application are as follows: The vibration damper with a built-in limit buffer structure provided by this application has a floating piston between the guide and the recovery valve assembly. The floating piston is preset at a set position during the piston rod extension stroke, so that the recovery valve assembly contacts the floating piston first when the piston rod extends, and the second spring provides buffering force, which effectively prevents the recovery valve assembly from directly hitting the guide. While improving the vibration damping effect, it also effectively extends the service life of the vibration damper. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this application;

[0014] Figure 2 Figure 1 Enlarged view of a portion of point A in the middle;

[0015] Figure 3 This is a schematic diagram of the recovery valve assembly in this application when it is in contact with the floating piston.

[0016] In the diagram: 1. Inner cylinder; 2. Outer cylinder; 3. Piston rod; 4. Reset valve assembly; 5. Compression valve assembly; 6. Base; 7. End cap; 701. First receiving cavity; 702. Second receiving cavity; 8. Oil seal; 9. Guide component; 10. Disc-shaped pressure plate; 11. Annular groove; 12. First spring; 13. Through hole; 14. Spring seat; 1401. Guide cylinder section; 15. Second spring; 16. Floating piston; 17. First flow passage; 18. Manifold; 19. Abutment plate; 20. Second flow passage; 21. First chamber; 22. Second chamber; 23. Third chamber; 24. Flange; 25. Ring platform; 26. Protective cover. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Please see Figure 1-3 A vibration damper with a built-in limiting and buffering structure includes an inner cylinder 1, an outer cylinder 2, and a piston rod 3 that is movably inserted into the inner cylinder 1. One end of the outer cylinder 2 is connected to a base 6, and the other end is connected to an end cap 7. A compression valve assembly 5 is provided at the end of the base 6 adjacent to the inner cylinder 1, and a guide member 9 is provided at the end of the end cap 7 adjacent to the inner cylinder 1. A reset valve assembly 4 is installed at the end of the piston rod 3 facing the compression valve assembly 5. The piston rod 3 slides through the guide member 9 and the end cap 7. A floating piston 16 is provided in the inner cylinder 1 for abutting and buffering against the reset valve assembly 4 at a set position during the extension stroke of the piston rod 3. A second spring 15 is provided between the floating piston 16 and the guide member 9. The second spring 15 is used to reset the floating piston 16 to the set position during the retraction stroke of the piston rod 3 and to apply a buffering force to the floating piston 16 during the extension stroke of the piston rod 3.

[0019] According to the structure provided in this embodiment, the vibration damper with a built-in limiting buffer structure provided in this application has a floating piston 16 between the guide 9 and the recovery valve assembly 4, and the floating piston 16 is preset at a set position in the extension stroke of the piston rod 3, so that the recovery valve assembly 4 first contacts the floating piston 16 when the piston rod 3 extends, and the second spring 15 provides buffering force, effectively preventing the recovery valve assembly 4 from directly hitting the guide 9, thereby improving the vibration damping effect and effectively extending the service life of the vibration damper.

[0020] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 3 The floating piston 16 has an annular manifold 18 on its end face facing the recovery valve assembly 4. The floating piston 16 has a plurality of first flow holes 17 arranged around its own axis. All the first flow holes 17 axially penetrate the floating piston 16 and one end of the first flow holes 17 opens into the manifold 18. The axes of all the first flow holes 17 form a virtual cone and the small end of the virtual cone faces the recovery valve assembly 4. The end of the recovery valve assembly 4 facing the floating piston 16 is equipped with an abutment plate 19 for abutting against the floating piston 16. The abutment plate 19 has a plurality of second flow holes 20. When the abutment plate 19 abuts against the floating piston 16, the second flow holes 20 are used to form a channel between the manifold 18 and the recovery valve assembly 4. In this embodiment, the guide 9, floating piston 16, recovery valve assembly 4, and compression valve assembly 5 sequentially divide the inner cylinder 1, which serves as the working cylinder, into a first chamber 21, a second chamber 22, and a third chamber 23. It can be understood that the volumes of the first chamber 21, the second chamber 22, and the third chamber 23 change as the positions of the floating piston 16 and the recovery valve assembly 4 move.

[0021] According to the structure provided in this embodiment, when the piston rod 3 is in its extended stroke, the hydraulic oil in the second chamber 22 is throttled by the recovery valve assembly 4 and enters the third chamber 23. When the recovery valve assembly 4 moves to the preset position of the floating piston 16, the abutment plate 19 abuts against the floating piston 16. During the continued movement, the hydraulic oil in the first chamber 21 passes through the first flow hole 17, the manifold 18, the second flow hole 20, the second chamber 22, and is throttled by the recovery valve assembly 4 before entering the third chamber 23. At this time, the second spring 15 is compressed. In this way, on the one hand, the piston rod 3 extends smoothly, and on the other hand, the second spring 15 and the floating piston 16 work together to buffer the recovery valve assembly 4 and the piston rod 3. The abutment plate 19 avoids direct contact between the recovery valve assembly 4 and the floating piston 16, which helps to extend the service life and stability of the recovery valve assembly 4, thereby improving the performance of the shock absorber.

[0022] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 3The damper, featuring a built-in limiting and buffering structure, also includes paired spring seats 14 that slide onto the outer surface of the piston rod 3. The opposing end faces of the two spring seats 14 abut against the floating piston 16 and the guide member 9, respectively. Each adjacent end face of the two spring seats 14 extends axially to form a guide cylinder portion 1401. The end faces of the second spring 15 abut against the end faces of the corresponding spring seats 14, and the inner diameter surfaces of the two ends of the second spring 15 are respectively fitted onto the corresponding guide cylinder portions 1401. This design ensures that the inner diameter of the second spring 15 is larger than the diameter of the piston rod 3, and the guide cylinder portions 1401 maintain a stable distance between the inner diameter surface of the second spring 15 and the outer surface of the piston rod 3, preventing friction between the second spring 15 and the piston rod 3 surface and improving the service life of the piston rod 3. The spring seats 14 can be made of a metal or working plastic with a hardness lower than the surface hardness of the piston rod 3 to reduce wear on the piston rod 3 and further improve its service life.

[0023] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 3 The end cap 7 forms a second receiving cavity 702, and the opening of the second receiving cavity 702 expands radially to form a coaxial first receiving cavity 701. The outer wall of the first receiving cavity 701 is sealed and fixedly sleeved onto the inner wall of the port of the outer cylinder 2. The second receiving cavity 702 is further away from the outer cylinder 2 than the first receiving cavity 701. An oil seal 8 is installed in the second receiving cavity 702. The piston rod 3 slides through the sealing surface of the oil seal 8 and exits the bottom of the second receiving cavity 702. It is understood that the end cap 7 is made by stamping and connected to the outer cylinder 2 by welding. The bottom of the second receiving cavity 702 has a hole for the piston rod 3 to pass through. In this way, the oil seal 8 is set at the front end of the guide member 9, which on the one hand prevents external impurities from entering and damaging the guide member 9 with the piston rod 3, and on the other hand, effectively prevents hydraulic oil leakage.

[0024] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 3 The guide member 9 includes a flange 24 and an annular platform 25 that are integrated together. The end of the flange 24 is fastened into the first receiving cavity 701, and the annular platform 25 is connected to the port of the inner cylinder 1. An annular groove 11 is formed on the end face of the flange 24. The first spring 12 is sleeved on the piston rod 3 and its two ends abut against the oil seal 8 and the annular groove 11 respectively. The first spring 12 applies a set elastic force to the oil seal 8, which helps the sealing area of ​​the oil seal 8 to fit tightly against the surface of the piston rod 3, resulting in a better sealing effect.

[0025] In another embodiment of this application, the bottom of the second receiving cavity 702 and the corresponding end of the oil seal 8 are both adapted conical. The end of the oil seal 8 away from the second receiving cavity 702 is covered by a disc-shaped pressure plate 10. The two ends of the first spring 12 abut against the disc-shaped pressure plate 10 and the annular groove 11, respectively. In this embodiment, the disc-shaped pressure plate 10 and the end of the oil seal 8 that cooperates with the disc-shaped pressure plate 10 are also correspondingly set as conical. In this way, the force applied by the first spring 12 to the oil seal 8 in the axial direction will better compress the oil seal 8 so that the sealing area of ​​the oil seal 8 fits against the surface of the piston rod 3. Thus, when the oil seal 8 is slightly worn, the oil seal 8 has the effect of automatically compensating and maintaining the sealing effect due to the action of the first spring 12. At the same time, the small diameter of the annular groove 11 is also conical, thereby positioning the first spring 12 radially, so that the inner diameter surface of the first spring 12 is far away from the surface of the piston rod 3, avoiding mutual wear.

[0026] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 3 The guide member 9 has a through hole 13 that connects the annular groove 11 and the outer cylinder 2. In this way, the hydraulic oil in the outer cylinder 2 can be introduced between the disc-shaped pressure plate 10 and the annular groove 11, which is beneficial for lubricating the first spring 12 and the guide surface of the guide member 9.

[0027] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 3 The piston rod 3 is equipped with a protective cover 26 at its outer end. The protective cover 26 is loosely fitted outside the outer cylinder 2 and its length is adapted to the maximum stroke of the piston rod 3. In this way, the piston rod 3 can still be effectively protected when it extends to its maximum stroke, thereby maintaining the stability and reliability of the shock absorber.

[0028] 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 process, method, article, or apparatus.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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. Therefore, they should not be construed as limitations on this application.

[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0031] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shock absorber with built-in limiting and buffering structure, comprising an inner cylinder (1) and an outer cylinder (2) and a piston rod (3) movably penetrating in the inner cylinder (1); one end of the outer cylinder (2) is connected with a base (6), and the other end is connected with an end cover (7); the base (6) is provided with a compression valve assembly (5) at the adjacent end of the inner cylinder (1), the end cover (7) is provided with a guide (9) at the adjacent end of the inner cylinder (1), one end of the piston rod (3) towards the compression valve assembly (5) is provided with a restoring valve assembly (4), the piston rod (3) slides out of the guide (9) and the end cover (7), characterized in that: The inner cylinder (1) is provided with a floating piston (16) for abutting against the restoring valve assembly (4) at a set position during the extension stroke of the piston rod (3) and a second spring (15) disposed between the floating piston (16) and the guide member (9). The second spring (15) is used to reset the floating piston (16) to the set position during the retraction stroke of the piston rod (3) and to apply a buffering force to the floating piston (16) during the extension stroke of the piston rod (3).

2. The vibration damper with a built-in limiting and buffering structure according to claim 1, characterized in that: The floating piston (16) has an annular manifold (18) on its end face facing the recovery valve assembly (4). The floating piston (16) has a plurality of first flow holes (17) arranged around its own axis. All the first flow holes (17) axially penetrate the floating piston (16) and one end of the first flow hole (17) opens into the manifold (18). The axes of all the first flow holes (17) form a virtual cone and the small end of the virtual cone faces the recovery valve assembly (4). The recovery valve assembly (4) is equipped with an abutment plate (19) for abutting against the floating piston (16) at one end facing the floating piston (16). The abutment plate (19) has a plurality of second flow holes (20). When the abutment plate (19) abuts against the floating piston (16), the second flow holes (20) are used to form a channel between the manifold (18) and the recovery valve assembly (4).

3. The vibration damper with a built-in limiting and buffering structure according to claim 1, characterized in that: It also includes a pair of spring seats (14) that are slidably fitted onto the outer circular surface of the piston rod (3). The two opposite end faces of the two spring seats (14) abut against the floating piston (16) and the guide member (9), respectively. The two adjacent end faces of the two spring seats (14) extend axially to form a guide cylinder portion (1401). The two end faces of the second spring (15) abut against the end faces of the corresponding spring seats (14), respectively. The inner diameter surfaces of the two ends of the second spring (15) are respectively sleeved on the corresponding guide cylinder portion (1401).

4. The vibration damper with a built-in limiting and buffering structure according to claim 1, characterized in that: The end cap (7) forms a second receiving cavity (702), and the opening of the second receiving cavity (702) is radially expanded to form a coaxial first receiving cavity (701). The outer wall of the first receiving cavity (701) is sealed and fixedly sleeved to the inner wall of the port of the outer cylinder (2). The second receiving cavity (702) is further away from the outer cylinder (2) than the first receiving cavity (701). An oil seal (8) is installed in the second receiving cavity (702). The piston rod (3) is sealed and slides through the sealing surface of the oil seal (8) and passes through the bottom of the second receiving cavity (702).

5. The vibration damper with a built-in limiting and buffering structure according to claim 4, characterized in that: The guide member (9) includes a flange (24) and an annular platform (25) that are integrated together. The end of the flange (24) is fastened to the first receiving cavity (701), and the annular platform (25) is connected to the port of the inner cylinder (1). An annular groove (11) is formed on the end face of the flange (24). The first spring (12) is sleeved on the piston rod (3) and its two ends abut against the oil seal (8) and the annular groove (11) respectively.

6. The vibration damper with a built-in limiting buffer structure according to claim 5, characterized in that: The bottom of the second receiving cavity (702) and the corresponding end of the oil seal (8) are both adapted cones. The end of the oil seal (8) away from the second receiving cavity (702) is covered by a disc-shaped pressure plate (10). The two ends of the first spring (12) abut against the disc-shaped pressure plate (10) and the annular groove (11) respectively.

7. The vibration damper with a built-in limiting and buffering structure according to claim 5, characterized in that: The guide member (9) has a through hole (13) that connects the annular groove (11) and the outer cylinder (2).

8. The vibration damper with a built-in limiting and buffering structure according to any one of claims 1 to 5, characterized in that: The piston rod (3) is equipped with a protective cover (26) at its outer end. The protective cover (26) is loosely fitted outside the outer cylinder (2), and the length of the protective cover (26) is adapted to the maximum stroke of the piston rod (3).

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