Sealing structure for shock absorber

Abstract

The utility model discloses a sealing structure for a shock absorber, which relates to the technical field of sealing structures and comprises an outer cylinder, a guide sleeve fixedly connected to the top of the outer cylinder, a piston rod slidably connected to the inside of the guide sleeve, an inner cylinder fixedly connected to the inside of the outer cylinder, a buffer cavity formed between the inner cylinder and the outer cylinder, and a mounting block fixedly connected to the top wall of the inside of the inner cylinder. A mounting groove is formed in the mounting block, a supporting ring is fixedly connected to the middle position in the mounting groove, a Y-shaped abutting ring is fixedly connected to the upper portion of the supporting ring, a fork-shaped abutting ring is fixedly connected to the lower portion of the supporting ring, and the inner side of the Y-shaped abutting ring and the inner side of the fork-shaped abutting ring abut against the outer surface of the piston rod; first pressure relief holes penetrate through the left and right side walls of the lower end of the inner cylinder, and second pressure relief holes penetrate through the left and right side walls of the upper end of the inner cylinder. The sealing device has the advantages that oil in the inner cylinder is ensured to be in a stable state, the situation that instantaneous pressure is too large is avoided, the oil pressure is effectively balanced, and sealing failure caused by uneven pressure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a sealing structure for a shock absorber. Background Technique

[0002] With the leapfrog development of the domestic rail transit equipment industry, the operating speed of locomotives and rolling stocks has also increased accordingly. The majority of passengers pay more attention to the safety and comfort of taking rail transit than ever before. As a key component of locomotives and rolling stocks, the shock absorption and safety of oil shock absorbers are increasingly valued by the scientific and technological workers of the main engine factories.

[0003] For example, Chinese Patent (CN214404465U) discloses a reciprocating concentric sealing structure for a motorcycle shock absorber, including a main cylinder body. The number of the main cylinder bodies is two. Fixed sleeves are fixedly installed at the tops of the two main cylinder bodies. A fixed groove is formed in the front of the fixed sleeve. An outer sealing ring is sleeved in the inner cavity of the fixed groove. The outer diameter of the outer sealing ring is the same as the outer diameter of the fixed groove. In this reciprocating concentric sealing structure of the motorcycle shock absorber, it is fixed through a fixing bolt and a bolt hole formed in a fixing plate. At this time, the oil liquid located inside the main cylinder body can be blocked by a lower sealing gasket and an upper sealing gasket. At the same time, through holes can enable the oil liquid to pass through each other. And multiple blockings are carried out through an inner sealing ring and an outer sealing ring to prevent leakage. When the outer sealing ring is under pressure, the reinforcing ribs can absorb part of the pressure to prevent the inner sealing ring from deforming and causing leakage, enhancing the sealing effect, thereby achieving the advantage of better sealing effect.

[0004] The above solution resists high-pressure oil liquid by arranging reinforcing ribs on the outer sealing ring to enhance the sealing effect. However, relying solely on the sealing ring in such a high-pressure environment cannot ensure the sealing performance. And using multiple sealing gaskets to ensure the sealing performance results in a large frictional force, leading to a large error in the low-speed damping force value, which will cause the service life of the shock absorber to be not high. To solve the above problems, a sealing structure for a shock absorber is now proposed. Content of the Utility Model

[0005] To solve the above technical problems, a sealing structure for a shock absorber is provided, which solves the problems that currently, by arranging reinforcing ribs on the outer sealing ring to resist high-pressure oil liquid and enhance the sealing effect, but relying solely on the sealing ring in such a high-pressure environment cannot ensure the sealing performance. And using multiple sealing gaskets to ensure the sealing performance results in a large frictional force, leading to a large error in the low-speed damping force value, which will cause the service life of the shock absorber to be not high.

[0006] To achieve the above object, the technical solution adopted by the present utility model is as follows: A sealing structure for a shock absorber, including an outer cylinder, a guide sleeve is fixedly connected to the top of the outer cylinder, a piston rod is slidably connected inside the guide sleeve, an inner cylinder is fixedly connected inside the outer cylinder, a buffer cavity is formed between the inner cylinder and the outer cylinder, an installation block is fixedly connected to the top wall inside the inner cylinder, an installation groove is opened inside the installation block, a support ring is fixedly connected to the middle position inside the installation groove, a Y-shaped abutting ring is fixedly connected above the support ring, a fork-shaped abutting ring is fixedly connected below the support ring, the inner sides of the Y-shaped abutting ring and the fork-shaped abutting ring are both abutted against the outer surface of the piston rod, a third sealing ring is detachably connected to the inside of the installation groove and below the fork-shaped abutting ring, first pressure relief holes are penetrated and opened on the left and right side walls of the lower end of the inner cylinder, and second pressure relief holes are penetrated and opened on the left and right side walls of the upper end of the inner cylinder.

[0007] Preferably, a bottom plate is fixedly connected to the inside of the lower end of the inner cylinder and above the first pressure relief hole, conical oil passing holes are opened on the left and right sides of the upper surface of the bottom plate, and the two oil passing holes are symmetric about the axis center of the bottom plate.

[0008] Preferably, a connecting column is slidably connected inside the two oil passing holes, a sealing gasket is fixedly connected to one side of the connecting column, and blocking strips are fixedly connected to the left and right sides of the other end of the connecting column.

[0009] Preferably, a push plate is fixedly connected to the lower end of the piston rod and inside the inner cylinder through a fastening nut, and a second sealing ring is arranged between the push plate and the fastening nut.

[0010] Preferably, a first sealing ring is fixedly connected to the outside of the push plate, and the first sealing ring is in interference fit with the inner wall of the inner cylinder, and the fit clearance is 0 mm - 0.4 mm.

[0011] Preferably, a connecting seat is fixedly connected to the bottom of the outer cylinder, and an internal thread hole for connecting a bolt is opened at the lower end of the connecting seat.

[0012] Preferably, an arc-shaped sealing protrusion is arranged in the middle of the outside of the third sealing ring.

[0013] Compared with the prior art, the advantages of the present utility model are as follows: By providing two oil passing holes, the present utility model ensures the unidirectional flow of oil under specific conditions under the pushing action of the push plate, reduces the flow velocity of the oil, and the first pressure relief hole, the buffer chamber and the second pressure relief hole can ensure that the oil in the inner cylinder is in a stable state when the shock absorber is under pressure, preventing the situation of excessive instantaneous pressure, effectively balancing the oil pressure, reducing the seal failure caused by uneven pressure, the bearing ring provides a stable support foundation, and the Y-shaped abutting ring and the fork-shaped abutting ring closely fit the piston rod from different angles, effectively preventing the leakage of oil from the gap between the piston rod and the inner cylinder, and improving the reliability and durability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a sectional view of the present utility model;

[0016] Figure 3 is Figure 2 a partial enlarged view of A in

[0017] Figure 4 is Figure 2 a partial enlarged view of B in

[0018] Figure 5 is Figure 2 a partial enlarged view of C in

[0019] Figure 6 is a schematic connection diagram of the connecting column, the gasket and the blocking strip of the present utility model.

[0020] The reference numerals in the drawings are:

[0021] 1. Outer cylinder; 2. Connecting seat; 3. Inner cylinder; 4. Buffer chamber; 5. First pressure relief hole; 6. Second pressure relief hole; 7. Bottom plate; 8. Oil passing hole; 9. Connecting column; 10. Gasket; 11. Blocking strip; 12. Piston rod; 13. Fastening nut; 14. Push plate; 15. First sealing ring; 16. Second sealing ring; 17. Mounting block; 18. Mounting groove; 19. Third sealing ring; 20. Fork-shaped abutting ring; 21. Support ring; 22. Y-shaped abutting ring; 23. Sealing protrusion; 24. Guide sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments described below are only examples, and other obvious variations can be thought of by those skilled in the art.

[0023] Referring to Figures 1-6As shown in the figure, a sealing structure for a shock absorber includes an outer cylinder 1. A guide sleeve 24 is fixedly connected to the top of the outer cylinder 1. The guide sleeve 24 ensures that the piston rod 12 moves in a straight line during up and down movement, reducing lateral offset and friction, improving the sealing effect and shock absorption performance. The piston rod 12 is slidably connected inside the guide sleeve 24. An inner cylinder 3 is fixedly connected inside the outer cylinder 1. A buffer chamber 4 is formed between the inner cylinder 3 and the outer cylinder 1. It is worth noting that the buffer chamber 4, as a buffer area for the flow of hydraulic oil, can absorb and disperse impact energy, making the shock absorption process smoother. Through the design of the first pressure relief hole 5 and the second pressure relief hole 6, the effective circulation of hydraulic oil between the upper and lower parts of the push plate 14 and the buffer chamber 4 is realized, effectively regulating the hydraulic oil pressure and preventing seal failure and oil leakage caused by excessive pressure. A mounting block 17 is fixedly connected to the inner top wall of the inner cylinder 3. An installation groove 18 is opened inside the mounting block 17. A support ring 21 is fixedly connected to the middle position inside the installation groove 18. A Y-shaped abutting ring 22 is fixedly connected above the support ring 21. A fork-shaped abutting ring 20 is fixedly connected below the support ring 21. The inner sides of the Y-shaped abutting ring 22 and the fork-shaped abutting ring 20 are both abutted against the outer surface of the piston rod 12. A third sealing ring 19 is detachably connected between the inside of the installation groove 18 and below the fork-shaped abutting ring 20. The first pressure relief holes 5 are respectively penetrated through the left and right side walls at the lower end of the inner cylinder 3, and the second pressure relief holes 6 are respectively penetrated through the left and right side walls at the upper end of the inner cylinder 3.

[0024] A bottom plate 7 is fixedly connected between the lower end inside the inner cylinder 3 and above the first pressure relief hole 5. Conical oil passing holes 8 are respectively opened on the left and right sides of the upper surface of the bottom plate 7. The two oil passing holes 8 are centrosymmetric about the axis of the bottom plate 7.

[0025] Connecting columns 9 are slidably connected inside the two oil passing holes 8. A sealing pad 10 is fixedly connected to one side of the connecting column 9. Blocking strips 11 are respectively fixedly connected to the left and right sides of the other end of the connecting column 9.

[0026] The lower end of the piston rod 12 and the inside of the inner cylinder 3 are fixedly connected with a push plate 14 through a fastening nut 13. A second sealing ring 16 is arranged between the push plate 14 and the fastening nut 13. The second sealing ring 16 prevents oil from leaking from the gap at the connection between the push plate 14 and the piston rod 12.

[0027] A first sealing ring 15 is fixedly connected to the outside of the push plate 14. The first sealing ring 15 is in interference fit with the inner wall of the inner cylinder 3, and the interference fit gap is 0.2 mm - 0.4 mm. The first sealing ring 15 prevents oil from leaking from the gap between the push plate 14 and the inner cylinder 3.

[0028] A connecting seat 2 is fixedly connected to the bottom of the outer cylinder 1. An internal thread hole for connecting bolts is opened at the lower end of the connecting seat 2. The connecting seat 2 facilitates the connection and installation of the shock absorber with other components, improving the integration and convenience of the overall system. The design of the internal thread hole makes the connection more firm and reliable, and can withstand a large working load.

[0029] An arc-shaped sealing protrusion 23 is provided in the middle of the outer side of the third sealing ring 19. The arc-shaped sealing protrusion 23 enhances the sealing effect between the third sealing ring 19 and the mounting groove 18, and can maintain good sealing performance even under high pressure. This design further prevents the leakage of oil from the mounting groove 18 and improves the performance of the overall sealing system.

[0030] Working principle: When the shock absorber is under pressure, the piston rod 12 pushes the push plate 14 downward to squeeze the oil. At this time, the left sealing gasket 10 and the right blocking strip 11 will stick above the bottom plate 7. At this time, the left oil passage hole 8 is closed and the right oil passage hole 8 is opened. The excess oil will enter below the bottom plate 7 through the right oil passage hole 8 and enter the buffer cavity 4 through the first pressure relief hole 5. The oil in the buffer cavity 4 will enter above the push plate 14 through the second pressure relief hole 6, thereby regulating the pressure of the oil and reducing the leakage caused by excessive oil pressure. When the piston rod 12 returns to its original position, the push plate 14 moves upward. At this time, the left blocking strip 11 and the right sealing gasket 10 will stick below the bottom plate 7. At this time, the left oil passage hole 8 is opened and the right oil passage hole 8 is closed. The oil above the push plate 14 will enter the buffer cavity 4 through the second pressure relief hole 6. The oil in the buffer cavity 4 re-enters below the push plate 14 through the first pressure relief hole 5 and the left oil passage hole 8. And the support ring 21 provides stable support. The Y-shaped abutting ring 22 and the fork-shaped abutting ring 20 tightly abut the piston rod 12 from the upper and lower sides, effectively preventing oil leakage and ensuring the smooth movement of the piston rod 12.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a shock absorber, characterized in that: It includes an outer cylinder (1), a guide sleeve (24) is fixedly connected to the top of the outer cylinder (1), a piston rod (12) is slidably connected inside the guide sleeve (24), an inner cylinder (3) is fixedly connected inside the outer cylinder (1), a buffer cavity (4) is formed between the inner cylinder (3) and the outer cylinder (1), a mounting block (17) is fixedly connected to the top wall inside the inner cylinder (3), a mounting groove (18) is formed inside the mounting block (17), a supporting ring (21) is fixedly connected to the middle position inside the mounting groove (18), a Y-shaped abutting ring (22) is fixedly connected above the supporting ring (21), a fork-shaped abutting ring (20) is fixedly connected below the supporting ring (21), the inner sides of the Y-shaped abutting ring (22) and the fork-shaped abutting ring (20) are both abutted against the outer surface of the piston rod (12), a third sealing ring (19) is detachably connected to the inside of the mounting groove (18) and below the fork-shaped abutting ring (20), first pressure relief holes (5) are respectively formed through the left and right side walls at the lower end of the inner cylinder (3), and second pressure relief holes (6) are respectively formed through the left and right side walls at the upper end of the inner cylinder (3).

2. A sealing structure for a shock absorber according to claim 1, characterized in that: A bottom plate (7) is fixedly connected to the lower end inside the inner cylinder (3) and above the first pressure relief hole (5), conical oil passing holes (8) are respectively formed on the left and right sides of the upper surface of the bottom plate (7), and the two oil passing holes (8) are centrosymmetric about the axis of the bottom plate (7).

3. A sealing structure for a shock absorber according to claim 2, characterized in that: A connecting column (9) is slidably connected inside the two oil passing holes (8), a sealing pad (10) is fixedly connected to one side of the connecting column (9), and blocking bars (11) are respectively fixedly connected to the left and right sides of the other end of the connecting column (9).

4. A sealing structure for a shock absorber according to claim 1, characterized in that: A push plate (14) is fixedly connected to the lower end of the piston rod (12) and inside the inner cylinder (3) through a fastening nut (13), and a second sealing ring (16) is arranged between the push plate (14) and the fastening nut (13).

5. The sealing structure for a shock absorber according to claim 4, characterized in that: A first sealing ring (15) is fixedly connected to the outside of the push plate (14), and the first sealing ring (15) is in interference fit with the inner wall of the inner cylinder (3), and the fit clearance is 0.2 mm - 0.4 mm.

6. A sealing structure for a shock absorber according to claim 1, characterized in that: A connecting seat (2) is fixedly connected to the bottom of the outer cylinder (1), and an internal thread hole for connecting a bolt is formed at the lower end of the connecting seat (2).

7. A sealing structure for a shock absorber according to claim 1, characterized in that: An arc-shaped sealing protrusion (23) is arranged in the middle of the outside of the third sealing ring (19).

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