Anti-snaking oil damper

Abstract

The anti-snaking oil damper comprises a piston rod, a piston block, an outer cylinder, a piston inner cylinder, an inner end cover and an outer end cover, the inner end cover and the outer end cover are arranged at the two ends of the outer cylinder, the piston inner cylinder is arranged in the outer cylinder, and the two ends of the piston inner cylinder are connected with a first closed ring block and a second closed ring block correspondingly; one end of the piston rod extends into the piston inner cylinder and is connected with the piston block, the piston block is in sliding contact with the inner wall of the piston inner cylinder, a piston hole is formed in the piston block, a communicating groove is formed in the first sealing block, a communicating pipe is arranged between the first sealing ring block and the outer end cover in the length direction, and one end of the communicating pipe communicates with an inner cavity of the communicating groove; a transmission hole is formed in the outer end cover, one end of the transmission hole communicates with the communicating pipe, a backflow hole is formed in the outer end cover, and a communicating hole used for communicating the outer cylinder with the piston inner cylinder is formed in the second closed ring block. The damping device has the effect of improving the damping degree in the train snaking process.

Description

Technical Field

[0001] This application relates to the technical field of railway transportation, and in particular to an anti-hunting hydraulic vibration damper. Background Technology

[0002] Railway vibration dampers are devices used in railway vehicles and track systems to reduce vibration and impact, improving running smoothness, comfort, and safety. They reduce the negative impact of vibration on vehicles and tracks by absorbing and dissipating energy. Vibration dampers can be classified into various types according to their installation direction and application, such as lateral vibration dampers, vertical vibration dampers, and coupled vibration dampers.

[0003] Currently, common hydraulic shock absorber structures include a cylinder, piston rod, and piston block. The piston block is slidably mounted in the cylinder, and one end of the piston rod extends into the cylinder and connects to the piston block. Hydraulic oil is contained in the cylinder, and the piston block has piston holes through which the hydraulic oil passes.

[0004] Regarding the aforementioned technologies, the inventors believe that during the damping process, the piston block reciprocates within the cylinder, and hydraulic oil passes through the piston hole and both sides of the piston block, simultaneously providing damping force to the piston rod. However, during train serpentine maneuvers, the damper experiences greater vibrations and torques, and conventional dampers cannot meet the damping force requirements of the train body. Summary of the Invention

[0005] To improve the damping effect during train snagging, this application provides an anti-snagging hydraulic vibration damper.

[0006] The anti-hunting hydraulic vibration damper provided in this application adopts the following technical solution: An anti-hunting hydraulic vibration damper includes a piston rod, a piston block, an outer cylinder, a piston inner cylinder, an inner end cap, and an outer end cap. The inner end cap and the outer end cap are disposed at both ends of the outer cylinder. The piston inner cylinder is coaxially disposed within the outer cylinder. A first sealing ring block and a second sealing ring block are respectively connected to both ends of the piston inner cylinder. One end of the piston rod passes through the inner end cap and the first sealing ring block and extends into the piston inner cylinder. The piston block is connected to the end of the piston rod located within the piston inner cylinder. The piston block slides in contact with the inner wall of the piston inner cylinder. A piston hole is formed on the piston block, extending through both ends of the piston block along its length. The first sealing ring block... A connecting groove is provided on the side of the block near the inner cylinder of the piston, which communicates with both the outer cylinder and the inner cavity of the piston's inner cylinder. A connecting pipe is provided between the first sealing ring block and the outer end cap along the length direction. One end of the connecting pipe communicates with the inner cavity of the connecting groove, and the other end is inserted into the interior of the outer end cap. A transmission hole is provided inside the outer end cap, and one end of the transmission hole communicates with the connecting pipe. A return hole is provided on the end of the outer end cap near the outer cylinder, which communicates with the inner cavity of the outer cylinder. A connecting hole for communicating between the outer cylinder and the inner cylinder of the piston is provided on the side of the connecting hole near the piston block. A first one-way valve is provided on the side of the connecting hole near the piston block.

[0007] By adopting the above technical solution, when the piston block moves towards the second closed ring block, the hydraulic oil, under the pressure, passes through the piston hole and the piston block, and flows into the connecting pipe through the connecting groove on the first closed ring block. The hydraulic oil then flows through the connecting pipe and into the transmission hole for transmission, and finally enters the annular cavity between the outer cylinder and the inner piston cylinder through the return hole for temporary storage. When the piston block moves away from the second closed ring block, the first one-way valve opens, and the hydraulic oil in the outer cylinder enters the inner piston cylinder through the connecting hole on the second closed ring block. Through the mutual cooperation of the piston rod, piston block, outer cylinder, inner piston cylinder, inner end cap, and outer end cap, the hydraulic oil travel stroke of the shock absorber is expanded, increasing the damping force of the device during use, thus improving the damping effect during train slithering.

[0008] Optionally, the first one-way valve includes a connecting pipe, a limiting ring, and a first valve ring. The connecting pipe passes through the second sealing ring block and is slidably connected to it. The limiting ring is disposed at one end of the connecting pipe near the outer end cap. The first valve ring is connected to one end of the connecting pipe located in the piston inner cylinder. A first elastic element is disposed between the limiting ring and the second sealing ring block. In its natural state, the first valve ring abuts against one side of the second sealing ring block under the action of the first elastic element and blocks the connecting hole.

[0009] By adopting the above technical solution, the first check valve is installed on the second closed ring block. When the piston block moves towards the second closed ring block, the first valve ring is in a closed state under hydraulic pressure, blocking the connecting hole. When the piston block moves away from the second closed ring block, the first valve ring moves towards the piston block under the hydraulic pressure of the piston inner cylinder, releasing the blockage of the connecting hole. The hydraulic oil between the piston inner cylinder and the outer cylinder flows back into the piston inner cylinder through the connecting hole. The first check valve achieves one-way sealing of the connecting hole, preventing hydraulic oil from flowing directly into the outer cylinder from the connecting hole. In addition, the first check valve helps to improve the damping force of the shock absorber to cope with the vibration generated during train zigzag.

[0010] Optionally, one end of the piston rod located in the inner cylinder of the piston is coaxially connected to an mounting rod. The piston block is disposed on the mounting rod, and a gap is left between one end of the piston block and the end of the piston rod. A second one-way valve is disposed on the side of the piston block near the piston rod. The second one-way valve includes a second elastic element and a second valve ring. The second valve ring is slidably sleeved on the outside of the mounting rod. The second elastic element is disposed between the second valve ring and the end of the piston rod. In its natural state, the second valve ring abuts against one side of the piston rod under the action of the second elastic element and seals the piston hole.

[0011] By adopting the above technical solution, when the piston block moves towards the first closed ring block, the second valve ring, under the action of high hydraulic pressure in the piston inner cylinder, presses against the piston block, thus sealing the piston hole and preventing hydraulic oil in the piston inner cylinder from flowing directly from one end to the other through the piston hole. When the piston block moves towards the second closed ring block, the hydraulic oil on the side of the piston inner cylinder closest to the second closed ring block flows through the piston hole and pushes open the second valve ring, flowing to the other side of the piston block. The setting of the second one-way valve achieves one-way sealing of the hydraulic oil, restricting and guiding the flow of hydraulic fluid, which helps to further improve the damping force of the shock absorber.

[0012] Optionally, the outer end cap has an internal mounting cavity that is connected to both the reflux hole and the transmission hole. A filter tube is installed in the mounting cavity. One end of the filter tube facing the transmission hole is open, and the other end is closed. A plurality of filter holes are provided on the peripheral wall of the filter tube, and the filter holes are connected to the reflux hole.

[0013] By adopting the above technical solution, the filter pipe filters the hydraulic oil passing through the transmission hole, trapping impurities in the hydraulic oil in the filter pipe. The filtered hydraulic oil then flows out through the filter hole, reducing the possibility of impurities in the hydraulic oil clogging the pipeline.

[0014] Optionally, one end of the mounting cavity extends to the edge of the outer end cap and is connected to the outside. The closed end of the filter tube is connected to a mounting block. One end of the mounting block extends out of the outer end cap through the mounting insert. The mounting block is threaded to the inner annular wall of the mounting cavity.

[0015] By adopting the above technical solution, the mounting block is detachably connected to the outer end cover through the mounting cavity. When it is necessary to clean the impurities in the filter tube, the mounting block and the filter tube set at its end can be taken out, which facilitates the cleaning of the filter tube.

[0016] Optionally, the edge of the second closed ring block is provided with an abutting edge, which abuts against the piston inner cylinder, and a buffer ring is provided at one end of the piston inner cylinder near the abutting edge, which abuts against the abutting edge.

[0017] By adopting the above technical solution, the buffer ring is placed between the end of the inner cylinder and the abutment edge, reducing the possibility of damage to the end of the inner cylinder during use.

[0018] Optionally, a mounting cover is provided at one end of the piston rod located outside the outer cylinder, and a dust cover is detachably connected to the mounting cover, which is fitted over the outside of the outer cylinder.

[0019] By adopting the above technical solution, the dust cover is set outside the outer cylinder and covers the outside of the piston rod, which reduces the possibility of external impurities sticking to the surface of the piston rod during the sliding process, and reduces the possibility of impurities being carried into the outer cylinder and the inner cylinder of the piston rod and affecting the quality of hydraulic oil.

[0020] Optionally, the outer ring wall of the piston block is provided with a first ring groove and a second ring groove. A Glyd ring is provided in the first ring groove and a wear-resistant ring is provided in the second ring groove. The Glyd ring includes a polytetrafluoroethylene ring and a rubber ring sleeved on its outside. The rubber ring abuts against the inner ring wall of the piston inner cylinder.

[0021] By adopting the above technical solution, combining PTFE rings with rubber rings, the high sealing performance and low friction of the Glyd ring are simultaneously achieved. The inclusion of wear-resistant rings reduces the likelihood of piston block wear during use, thus helping to extend the piston block's service life.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the piston rod, piston block, outer cylinder, piston inner cylinder, inner end cover and outer end cover, the hydraulic oil travel of the shock absorber is expanded, the damping force of the device during use is increased, and the effect of improving the damping effect during train serpentine movement is improved. 2. The installation of the first and second check valves enables one-way sealing of the hydraulic oil, thereby limiting and guiding the flow of hydraulic fluid, which helps to further improve the damping force of the shock absorber; 3. The installation of a filter pipe reduces the possibility of impurities in the hydraulic oil clogging the pipeline. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the structure of an anti-hunting hydraulic vibration damper according to an embodiment of this application.

[0024] Figure 2 This is a partial sectional view used in the embodiments of this application to illustrate the internal structure of the outer cylinder.

[0025] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0026] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0027] Figure 5 yes Figure 2 Enlarged view of section C.

[0028] Explanation of reference numerals in the attached drawings: 1. Connecting shaft; 2. Mounting cover; 3. Piston rod; 4. Outer end cover; 41. Insertion hole; 42. Transfer hole; 43. Return hole; 44. Mounting cavity; 5. Inner end cover; 51. Dustproof ring groove; 52. Alignment ring groove; 6. Outer cylinder; 7. Piston inner cylinder; 71. Buffer ring; 8. First closing ring block; 81. Alignment ring block; 82. Insertion ring block; 821. Communicating groove; 83. Mounting groove; 9. Second closing ring block; 91. Abutment edge; 92. Communicating hole; 11. Dust cover; 12. Mounting... 13. Rod; 14. Piston block; 15. Piston hole; 16. First ring groove; 17. Second ring groove; 18. Glyd ring; 19. Wear ring; 10. Dust seal; 11. Connecting pipe; 12. First check valve; 13. Mounting bolt; 14. Connecting pipe; 15. Limiting ring; 16. First one-way spring; 17. First valve ring; 18. Second one-way valve; 19. Abutment ring cover; 10. Second valve ring; 11. Second one-way spring; 20. Mounting block; 21. Filter pipe; 22. Filter hole. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be further described in detail below. Embodiments of this application provide an anti-hunting hydraulic vibration damper, which has the effect of improving the damping effect during train hunting.

[0030] Reference Figure 1 and Figure 2A hydraulic vibration damper for preventing snake-like movement includes a connecting shaft 1, a mounting cover 2, a piston rod 3, an outer end cover 4, an inner end cover 5, an outer cylinder 6, and a piston inner cylinder 7. Both ends of the outer cylinder 6 and the piston inner cylinder 7 are open, with the diameter of the piston inner cylinder 7 being smaller than the diameter of the outer cylinder 6. The inner end cover 5 and the outer end cover 4 are respectively connected to the openings at both ends of the outer cylinder 6. The piston inner cylinder 7 is coaxially disposed within the inner cavity of the outer cylinder 6. A first sealing ring block 8 and a second sealing ring block 9 are respectively connected to both ends of the piston inner cylinder 7. The first sealing ring block 8 is located at the end of the piston inner cylinder 7 closest to the inner end cover 5, and the second sealing ring block 9 is located at the end of the piston inner cylinder 7 closest to the outer end cover 4. The mounting cover 2 is connected to the outer section of the piston rod 3, and a dust cover 11 is connected to the mounting cover 2, covering the outside of the outer cylinder 6.

[0031] Reference Figure 1 and Figure 2 The piston rod 3 is coaxially arranged with respect to the outer cylinder 6. One end of the piston rod 3 passes through the inner end cap 5 and the first closing ring block 8 and extends into the inner cavity of the piston inner cylinder 7. A connecting shaft 1 is connected to both the end of the piston rod 3 located outside the outer cylinder 6 and the outer side of the outer end cap 4. Figure 5 A mounting rod 12 is coaxially fixed to one end of the piston rod 3 located in the piston inner cylinder 7. The diameter of the mounting rod 12 is smaller than the diameter of the piston rod 3. A piston block 13 is sleeved on the mounting rod 12, with one side of the piston block 13 spaced apart from the end of the piston rod 3. Several piston holes 131 are formed on the piston block 13, penetrating both axially opposite ends of the piston block 13. A first annular groove 132 and a second annular groove 133 are formed parallel to each other on the outer annular wall of the piston block 13. A Gladius ring 14 is provided in the first annular groove 132. The Gladius ring 14 includes a polytetrafluoroethylene ring and a rubber ring. The rubber ring is sleeved on the outer annular wall of the polytetrafluoroethylene ring and fits snugly against the inner annular wall of the piston inner cylinder 7. A wear-resistant ring 15 is provided in the second annular groove 133 and slides snugly against the inner annular wall of the piston inner cylinder 7.

[0032] Reference Figure 2 and Figure 3 A dustproof ring groove 51 is formed circumferentially on the inner ring wall of the inner end cover 5, and a dustproof ring 16 is provided in the dustproof ring groove 51. The dustproof ring 16 is fitted to the piston rod 3. An alignment ring groove 52 is formed circumferentially on the inner ring wall of the inner end cover 5 near the first sealing ring block 8. An alignment ring block 81 is coaxially connected to the side of the first sealing ring block 8 near the inner end cover 5. The alignment ring block 81 is inserted into the alignment ring groove 52, and an oil seal is provided circumferentially on the inner ring wall of the alignment ring block 81. An insertion ring block 82 is coaxially provided at the end of the first sealing ring block 8 near the piston inner cylinder 7. The outer diameter of the insertion ring block 82 is equal to the inner diameter of the piston inner cylinder 7, and the insertion ring block 82 is inserted into the piston inner cylinder 7.

[0033] Reference Figure 2 and Figure 3 A connecting pipe 17 is provided between the first sealing ring block 8 and the outer end cap 4, and the length direction of the connecting pipe 17 is parallel to the length direction of the piston inner cylinder 7. The end of the first sealing ring block 8 near the outer end cap 4 has a mounting groove 83 for inserting the connecting pipe 17, and a connecting ring block 82 has a connecting groove 821 communicating with the mounting groove 83. The end of the outer end cap 4 near the connecting pipe 17 has a insertion hole 41 for inserting the connecting pipe 17, and one end of the connecting pipe 17 is inserted into the insertion hole 41.

[0034] Reference Figure 2 and Figure 4 One side of the second sealing ring block 9 abuts against the inner wall of the outer end cap 4, and the edge of the second sealing ring block 9 is provided with an abutment edge 91. A buffer ring 71 is provided at one end of the piston inner cylinder 7 near the second sealing ring block 9, and the buffer ring 71 abuts against the abutment edge 91. A connecting hole 92 is provided on the second sealing ring block 9, and the connecting hole 92 connects the outer cylinder 6 and the inner cavity of the piston inner cylinder 7. A first one-way valve 18 is provided on the second sealing ring block 9. The first one-way valve 18 includes a mounting bolt 181, a connecting pipe 182, a limiting ring 183, a first one-way spring 184, and a first valve ring 185. The connecting pipe 182 passes through the second sealing ring and is slidably connected to it. The limiting ring 183 is connected to the end of the connecting pipe 182 near the outer end cap 4. The end of the connecting pipe 182 away from the limiting ring 183 is threadedly connected to the mounting bolt 181. The first valve ring 185 is clamped between the head of the mounting bolt 181 and the end of the connecting pipe 182, and is located on the side of the second closing ring block 9 away from the outer end cap 4. A first one-way spring 184 is sleeved on the connecting pipe 182, with one end connected to the limiting ring 183 and the other end abutting against the second closing ring block 9. In its natural state, the first valve ring 185, under the action of the first one-way spring 184, abuts against the second closing ring block 9, thus sealing the connecting hole 92.

[0035] Reference Figure 2 and Figure 5 A second one-way valve 19 is provided on the side of the piston block 13 near the piston rod 3. The second one-way valve 19 includes an abutment ring cover 191, a second valve ring 192, and a second one-way spring 193. The abutment ring cover 191 is sleeved on the mounting rod 12 and includes a support tube and a support ring. The support tube is sleeved on the mounting rod 12, with one end abutting against the piston block 13, and the support ring is located at the end of the support tube away from the piston block 13. The second valve ring 192 is slidably sleeved on the outside of the support tube, and the second one-way spring 193 is sleeved on the support tube. One end of the second one-way spring 193 is connected to the support ring, and the other end is connected to the second valve ring 192. In its natural state, the second valve ring 192, under the action of the second one-way spring 193, abuts against the piston block 13 and seals the piston hole 131.

[0036] Reference Figure 2 and Figure 4 The outer end cap 4 has a transmission hole 42 inside, one end of which is connected to the insertion hole 41. A return hole 43 is provided on the side of the outer end cap 4 near the second sealing ring block 9, and the return hole 43 is connected to the end of the transmission hole 42 away from the insertion hole 41. An installation cavity 44 is provided on the peripheral wall of the outer end cap 4, one end of which is connected to both the return hole 43 and the transmission hole 42. An installation block 20 is threaded into the installation cavity 44, and a filter tube 21 is connected to the end of the installation block 20 near the transmission hole 42. One end of the filter tube 21 is open, facing the transmission tube. Several filter holes 211 are provided on the peripheral wall of the filter tube 21, and the filter holes 211 are connected to the return hole 43.

[0037] Reference Figure 2 , Figure 3 and Figure 5 In use, the two connecting shafts 1 are connected to the two frames respectively to achieve anti-hunting vibration reduction between the two frames. When the piston block 13 slides in the piston cavity under the drive of the piston rod 3, it achieves vibration damping for the two frames. When the piston block 13 moves towards the second closed ring block 9, the hydraulic pressure in the piston inner cylinder 7 passes through the piston block 13 through several piston holes 131 and pushes open the second valve ring 192, and the second one-way spring 193 is compressed to accumulate elastic potential energy. The hydraulic oil enters the inner cavity of the piston inner cylinder 7 near the first closed ring block 8, and enters the connecting pipe 17 through the connecting groove 821, and then enters the transmission hole 42 through the connecting pipe 17.

[0038] Reference Figure 4 The hydraulic oil in the transmission hole 42 enters the filter pipe 21 for filtration, reducing the possibility of impurities in the hydraulic oil affecting the device. The filtered hydraulic oil flows through several filter holes 211 and the return hole 43 into the annular cavity between the outer cylinder 6 and the piston inner cylinder 7. At this time, the first valve ring 185 is in a closed state under hydraulic conditions. Because the mounting block 20 is threadedly connected to the mounting cavity 44, it facilitates cleaning of the filter pipe 21 by the operator.

[0039] Reference Figure 4 and Figure 5When the piston block 13 moves away from the second sealing ring block 9, the first valve ring 185 opens under hydraulic pressure, and the hydraulic oil in the outer cylinder 6 flows into the piston inner cylinder 7 through the connecting hole 92 on the second sealing ring block 9. The Glyd ring 14 simultaneously meets the requirements of high sealing performance and low friction when the piston block 13 slides. The wear-resistant ring 15 reduces the possibility of wear on the piston block 13 during sliding, helping to extend the service life of the device. The first one-way valve 18 and the second one-way valve 19 limit and guide the flow of hydraulic oil, achieving unidirectional flow of hydraulic oil, which helps to extend the flow path of hydraulic oil in the device, and also increases the damping force during use to meet the needs of the device during the serpentine process.

[0040] Reference Figure 1 , Figure 2 and Figure 4 The buffer ring 71 is positioned between the piston inner cylinder 7 and the abutment edge 91, reducing the possibility of damage to the end of the piston inner cylinder 7 during the buffering process. The dust cover 11 protects the piston rod 3, reducing the possibility of impurities from the external environment adhering to the piston rod 3 during sliding, which could lead to these impurities being carried into the outer cylinder 6 along with the piston rod 3, affecting the quality of the hydraulic oil.

[0041] The implementation principle of the anti-hunting hydraulic damper in this embodiment is as follows: When the piston block 13 moves towards the second closed ring block 9, the hydraulic oil in the piston inner cylinder 7 passes through several piston holes 131, passes through the piston block 13, and pushes open the second valve ring 192. The hydraulic oil enters the inner cavity of the piston inner cylinder 7 near the first closed ring block 8, enters the connecting pipe 17 through the connecting groove 821, and enters the transmission hole 42 through the connecting pipe 17. The hydraulic oil flows into the annular cavity between the outer cylinder 6 and the piston inner cylinder 7. When piston block 13 moves away from the second closed ring block 9, the first valve ring 185 opens under hydraulic pressure, and hydraulic oil in the outer cylinder 6 flows into the piston inner cylinder 7 through the connecting hole 92 on the second closed ring block 9. The first one-way valve 18 and the second one-way valve 19 limit and guide the flow of hydraulic oil, achieving unidirectional flow of hydraulic oil and increasing the damping force during use to meet the requirements of the device during the serpentine process.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An anti-hunting hydraulic vibration damper, characterized in that: The piston assembly includes a piston rod (3), a piston block (13), an outer cylinder (6), an inner piston cylinder (7), an inner end cap (5), and an outer end cap (4). The inner end cap (5) and the outer end cap (4) are located at both ends of the outer cylinder (6). The inner piston cylinder (7) is coaxially disposed within the outer cylinder (6). A first sealing ring block (8) and a second sealing ring block (9) are respectively connected to both ends of the inner piston cylinder (7). One end of the piston rod (3) passes through the inner end cap (5) and the first sealing ring block (8) and extends into the inner piston cylinder (7). The piston block (13) is connected to one end of the piston rod (3) located within the inner piston cylinder (7). The piston block (13) slides in contact with the inner wall of the inner piston cylinder (7). A piston hole (131) is provided on the piston block (13), and the piston hole (131) passes through both ends of the piston block (13) along its length. The first sealing ring block (8) is located near... A connecting groove (821) is provided on one side of the piston inner cylinder (7), which communicates with both the outer cylinder (6) and the inner cavity of the piston inner cylinder (7). A connecting pipe (17) is provided between the first sealing ring block (8) and the outer end cap (4) along the length direction. One end of the connecting pipe (17) communicates with the inner cavity of the connecting groove (821), and the other end is inserted into the interior of the outer end cap (4). A transmission hole (42) is provided inside the outer end cap (4). One end of the transmission hole (42) is connected to the connecting pipe (17). A return hole (43) is provided on the end of the outer end cap (4) near the outer cylinder (6), which communicates with the inner cavity of the outer cylinder (6). A connecting hole (92) is provided on the second sealing ring block (9) for connecting the outer cylinder (6) and the piston inner cylinder (7). A first one-way valve (18) is provided on the side of the connecting hole (92) near the piston block (13).

2. The anti-hunting hydraulic vibration damper according to claim 1, characterized in that: The first one-way valve (18) includes a connecting pipe (182), a limiting ring (183), and a first valve ring (185). The connecting pipe (182) passes through the second closing ring block (9) and is slidably connected to it. The limiting ring (183) is located at one end of the connecting pipe (182) near the outer end cap (4). The first valve ring (185) is connected to one end of the connecting pipe (182) located in the piston inner cylinder (7). A first elastic element is provided between the limiting ring (183) and the second closing ring block (9). In its natural state, the first valve ring (185) abuts against one side of the second closing ring block (9) under the action of the first elastic element and blocks the connecting hole (92).

3. The anti-hunting hydraulic vibration damper according to claim 2, characterized in that: The piston rod (3) is located in the piston inner cylinder (7) and is coaxially connected to the mounting rod (12). The piston block (13) is disposed on the mounting rod (12). There is a gap between one end of the piston block (13) and the end of the piston rod (3). A second one-way valve (19) is disposed on the side of the piston block (13) near the piston rod (3). The second one-way valve (19) includes a second elastic element and a second valve ring (192). The second valve ring (192) is slidably sleeved on the outside of the mounting rod (12). The second elastic element is disposed between the second valve ring (192) and the end of the piston rod (3). In the natural state, the second valve ring (192) abuts against one side of the piston rod (3) under the action of the second elastic element and blocks the piston hole (131).

4. The anti-hunting hydraulic vibration damper according to claim 1, characterized in that: The outer end cap (4) has an inner cavity (44) inside. The inner cavity (44) is connected to both the return hole (43) and the transmission hole (42). A filter tube (21) is provided in the inner cavity (44). One end of the filter tube (21) facing the transmission hole (42) is open, and the other end is closed. A plurality of filter holes (211) are provided on the peripheral wall of the filter tube (21). The filter holes (211) are connected to the return hole (43).

5. The anti-hunting hydraulic vibration damper according to claim 4, characterized in that: One end of the mounting cavity (44) extends to the edge of the outer end cap (4) and is connected to the outside. The closed end of the filter tube (21) is connected to a mounting block (20). One end of the mounting block (20) extends out of the outer end cap (4) through the mounting inlay. The mounting block (20) is threaded to the inner ring wall of the mounting cavity (44).

6. The anti-hunting hydraulic vibration damper according to claim 3, characterized in that: The second closed ring block (9) has an abutting edge (91) on its edge, which abuts against the piston inner cylinder (7). The piston inner cylinder (7) has a buffer ring (71) at one end near the abutting edge (91), which abuts against the abutting edge (91).

7. The anti-hunting hydraulic vibration damper according to claim 1, characterized in that: The piston rod (3) is provided with a mounting cover (2) at one end outside the outer cylinder (6). A dust cover (11) is detachably connected to the mounting cover (2) and is fitted onto the outside of the outer cylinder (6).

8. The anti-hunting hydraulic vibration damper according to claim 1, characterized in that: The piston block (13) has a first ring groove (132) and a second ring groove (133) on its outer ring wall. A Glyd ring (14) is provided in the first ring groove (132), and a wear-resistant ring (15) is provided in the second ring groove (133). The Glyd ring (14) includes a polytetrafluoroethylene ring and a rubber ring sleeved on its outside. The rubber ring abuts against the inner ring wall of the piston inner cylinder (7).

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