Integrated plate type single-cylinder shock absorber oil seal capable of resisting 150 bar dynamic pressure

Abstract

The utility model relates to the technical field of shock absorber sealing, in particular to an integrated plate-type single-cylinder shock absorber oil seal resistant to 150 bar dynamic pressure, which comprises a plate-type framework and a sealing body, the sealing body comprises a main seal, a static seal and a transition body, the transition body is attached to the inner end face of the plate-type framework, and the main seal and the static seal are connected into a whole through the transition body. The main seal comprises a sealing unit and a stress unit, the sealing unit is provided with a sealing antenna extending towards the side of the piston rod, and the stress unit is provided with a plurality of annular convex lines at the position of an inner hole of the plate-type framework, the device is an integrated plate-type oil seal applied to the single-cylinder shock absorber, sealing under the dynamic pressure of 150 bar can be achieved, the sealing effect is good, and the service life of the single-cylinder shock absorber is prolonged. And oil leakage in the cylinder is prevented.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper sealing technology, and in particular to an integrated plate-type monotube vibration damper oil seal that can withstand 150 bar dynamic pressure. Background Technology

[0002] During normal use, the internal pressure of a monotube shock absorber is typically between 10 and 50 bar. However, if subjected to high-intensity impacts, the pressure may reach over 100 bar. Integrated plate seals are widely used in monotube shock absorber applications due to their low cost, but currently, integrated plate seals cannot withstand pressures exceeding 100 bar.

[0003] Chinese invention patent application CN101027512A discloses a sealing device. Paragraph

[0047] of the specification describes the sealing device as including a metal ring with a cylindrical cross-section and a sealing body composed of a rubber-like elastomer vulcanized and bonded to the metal ring. The sealing body integrally vulcanizes and bonds the fixing and sealing parts to the metal ring. In the above-disclosed solution, under pressure load, when the sealing lips are in full contact, the front end of the main sealing lip can be prevented from detaching, thus stabilizing the contact width of the flat part and ensuring sealing performance. This application provides an integrated plate-type monotube shock absorber oil seal with a structure different from the above-disclosed solution and capable of meeting a dynamic pressure of 150 bar. Utility Model Content

[0004] Technical objective: In order to overcome the shortcomings of the existing technology, this utility model provides an integrated plate-type monotube vibration damper oil seal that can withstand dynamic pressure of 150 bar.

[0005] Technical Solution: To achieve the above objectives, this utility model discloses an integrated plate-type monotube shock absorber oil seal that can withstand dynamic pressure of 150 bar, comprising a plate skeleton and a sealing body. The sealing body includes a main seal, a static seal, and a transition body that is attached to the inner end face of the plate skeleton and connects the main seal and the static seal into one unit. The main seal includes a sealing unit and a stress unit. The sealing unit is provided with a sealing contact extending towards the piston rod side. The stress unit is provided with multiple annular ridges at the inner hole of the plate skeleton 1.

[0006] Preferably, the sealing contact includes a first lip, a second lip, and a third lip whose lengths gradually decrease towards the piston rod. The first lip cooperates with the piston rod to form a leak-proof end face, and the first lip and the second lip, as well as the second lip and the third lip, are connected by arcs.

[0007] Preferably, the main seal covers the plate frame and is flush with the outer end face of the plate frame.

[0008] Preferably, the static seal is provided with a fourth lip that extends into and seals with the inner wall of the cylinder, one end of the static seal is smoothly connected to the transition body, and the other end partially covers the outer wall of the plate frame.

[0009] Preferably, the main seal, static seal, and transition body form a pressure-bearing cavity, and the main seal has a stepped portion connected to the transition body on the side facing the pressure-bearing cavity.

[0010] Preferably, the facades of the stepped portion are all inclined toward the piston rod side.

[0011] The beneficial effects of this utility model are:

[0012] 1. This device is an integrated plate oil seal used on a single-cylinder vibration damper. It can achieve sealing under a dynamic pressure of 150 bar, prevent oil leakage inside the cylinder, and has low manufacturing cost.

[0013] 2. The first lip and piston rod cooperate to form a leak-proof end face, which plays the main sealing role. The second and third lips can adjust the stress distribution through their own elastic deformation, which plays an auxiliary sealing role. The stress unit has multiple annular convex grooves at the inner hole of the plate skeleton, which can improve the rubber damage at the inner hole of the plate skeleton caused by high pressure reciprocating motion. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure and installation of this utility model;

[0015] Figure 2 This is a partial sectional view of the present invention;

[0016] Figure 3 This is an enlarged view of the main sealing section of this utility model;

[0017] Figure 4 This is an enlarged view of the static sealing section of this utility model;

[0018] Figure 5 Photograph of the cavity in Experimental Example 1 of this utility model;

[0019] Figure 6 This is a 50x magnified photograph of the first lip in Test Example 1 of this utility model;

[0020] Figure 7 Photograph of the cavity in Experimental Example 2 of this utility model;

[0021] Figure 8 This is a 50x magnified photograph of the first lip in Experiment Example 2 of this utility model.

[0022] In the figure, 1. Plate frame; 101. Inner end face; 102. Outer end face; 103. Outer side wall; 2. Sealing body; 3. Main seal; 4. Transition body; 5. Static seal; 501. Fourth lip; 6. Sealing unit; 7. Stress unit; 701. Annular ridge; 8. Sealing antenna; 801. First lip; 802. Second lip; 803. Third lip; 804. Arc; 9. Stepped section; 901. Vertical surface; 10. Pressure chamber; 11. Piston rod. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 To be continued Figure 8 The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0024] An integrated plate-type monotube shock absorber oil seal resistant to 150 bar dynamic pressure, such as... Figures 1-2 As shown, the device includes a plate-type skeleton 1 and a sealing body 2. The plate-type skeleton 1 is made of a conventional metal material, and the sealing body 2 is made of rubber. The plate-type skeleton 1 and the sealing body 2 are vulcanized together. The sealing body 2 includes a main seal 3, a static seal 5, and a transition body 4 that is attached to the inner end face 101 of the plate-type skeleton 1 and connects the main seal 3 and the static seal 5 into one unit. During installation, the sealing body 2 faces the high-pressure side inside the cylinder.

[0025] like Figure 3 As shown, the main seal 3 covers the plate frame 1 and is flush with the outer end face 102 of the plate frame 1. The main seal 3 includes a sealing unit 6 and a stress unit 7. The sealing unit 6 is provided with a sealing contact 8 extending towards the piston rod 11. The sealing contact 8 includes a first lip 801, a second lip 802, and a third lip 803, which extend towards the piston rod 11 in progressively shorter lengths. The first lip 801 and the second lip 802, and the second lip 802 and the third lip 803 are all connected by an arc 804. The first lip 801 cooperates with the piston rod 11 to form a leak-proof end face, playing the main sealing role. The second lip 802 and the third lip 803 can adjust the stress distribution through their own elastic deformation, playing an auxiliary sealing role.

[0026] The stress unit 7 has multiple annular raised lines 701 at the inner hole of the plate frame 1. In this embodiment, five annular raised lines 701 are evenly spaced. The annular raised lines 701 can improve the rubber damage at the inner hole of the plate frame 1 caused by high pressure reciprocating motion.

[0027] like Figure 4As shown, the static seal 5 is provided with a fourth lip 501 extending into and sealingly engaging with the inner wall of the cylinder. One end of the static seal 5 is smoothly connected to the transition body 4, and the other end partially covers the outer wall 103 of the plate frame 1. The fourth lip 501 forms a seal with the inner wall of the cylinder, which can prevent oil leakage from the outer diameter during use. Furthermore, the main seal 3, the static seal 5, and the transition body 4 form a pressure-bearing cavity 10. The main seal 3 has a stepped portion 9 on the side facing the pressure-bearing cavity 10 that connects to the transition body 4. The vertical surfaces 901 of the stepped portion 9 are all inclined towards the piston rod 11. When high-pressure oil enters the pressure chamber 10, it generates tension on the vertical surface 901 of the stepped section 9 and the static seal 5. The first lip 801, the second lip 802, the third lip 803 and the fourth lip 501 all undergo elastic deformation under the action of tension. The first lip 801 seals more tightly with the piston rod 11 and the fourth lip 501 seals more tightly with the inner wall of the cylinder. At the same time, the second lip 802 and the third lip 803 can bear part of the stress, so that the device can achieve effective sealing under a dynamic pressure of 150 bar.

[0028] Two sets of the sealing device disclosed in this utility model were selected as Test Example 1 and Test Example 2. Simulating application conditions, they were subjected to 100,000 reciprocating motion tests under a dynamic pressure of 150 bar. The test results showed that neither Test Example 1 nor Test Example 2 exhibited oil leakage. Figures 5-8 As shown, the cavity and first lip of test examples 1 and 2 are in good condition, with no damage or detachment. This invention meets the sealing requirements of a single-tube vibration damper under dynamic pressure of 150 bar.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated plate mono-tube damper oil seal resistant to 150 bar dynamic pressure, comprising a plate skeleton (1) and a sealing body (2), characterized in that: The sealing body (2) includes a main seal (3), a static seal (5), and a transition body (4) that is attached to the inner end face (101) of the plate frame (1) and connects the main seal (3) and the static seal (5) into one. The main seal (3) includes a sealing unit (6) and a stress unit (7). The sealing unit (6) is provided with a sealing antenna (8) extending toward the piston rod (11). The stress unit (7) is provided with multiple annular ridges (701) at the inner hole of the plate frame (1).

2. The 150 bar dynamic pressure resistant, integrated, plate-type, single cylinder shock absorber oil seal of claim 1, wherein: The sealing contact (8) includes a first lip (801), a second lip (802), and a third lip (803) that extend toward the piston rod (11) with successively shortened lengths. The first lip (801) cooperates with the piston rod (11) to form a leak-proof end face. The first lip (801) and the second lip (802), as well as the second lip (802) and the third lip (803), are all connected by an arc (804).

3. The 150 bar dynamic pressure resistant, integrated, plate-type, mono-tube shock absorber oil seal of claim 1, wherein: The main seal (3) covers the plate frame (1) and is flush with the outer end face (102) of the plate frame (1).

4. The 150 bar dynamic pressure resistant, integrated, plate-type, mono-tube shock absorber oil seal of claim 1, wherein: The static seal (5) is provided with a fourth lip (501) extending into the inner wall of the cylinder and sealingly fitting therewith. One end of the static seal (5) is smoothly connected to the transition body (4), and the other end partially covers the outer wall (103) of the plate skeleton (1).

5. The 150 bar dynamic pressure resistant, integrated, plate-type, mono-tube shock absorber oil seal of claim 1, wherein: The main seal (3), static seal (5) and transition body (4) form a pressure chamber (10), and the main seal (3) has a stepped part (9) connected to the transition body (4) on the side facing the pressure chamber (10).

6. The 150 bar dynamic pressure resistant, integrated, plate-type, single cylinder shock absorber oil seal of claim 5, wherein: The facade (901) of the stepped section (9) is inclined toward the piston rod (11).

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