A double oil seal guide and air spring shock absorber

Abstract

The utility model discloses a double oil seal guide and an empty spring shock absorber, comprising a guide, wherein mounting grooves are provided on the inner walls of the top and bottom ends of the guide, and composite oil seals are provided in the two mounting grooves, wherein the composite oil seals include an inner lip oil seal and an outer lip oil seal, and the inner lip oil seal can be abutted against the inner wall of the mounting groove through the outer lip oil seal. In the utility model, by arranging the composite oil seal, i.e., the inner lip oil seal and the outer lip oil seal, at the top end of the guide, the inner lip oil seal can seal the piston rod when the piston rod moves downward, thereby preventing external gas from entering the shock absorber.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts and equipment, and more specifically to a double oil seal guide and an air spring shock absorber. Background Art

[0002] In the field of air spring shock absorbers, the sealing is an important factor in determining the performance of a product, which determines the life and safety of the vehicle. The sealing of the shock absorber is mainly achieved by the front oil seal structure, which is a key factor reflecting the overall quality level of a shock absorber. In order to stably ensure its sealing and enable it to be used for a long time, the oil seal guide structure must be more reasonable and durable;

[0003] Single cylinder shock absorber generally uses only one composite oil seal, see Figure 1 The existing single oil seal guide sealing structure includes a sealing ring 28, a guide 5, a sealing ring 4, a composite oil seal 2, a composite oil seal 7, an oil seal baffle 26, and a sealing ring 28. A sealing ring 28 is provided on the top of the guide 5, and a composite oil seal 2 and a composite oil seal 7 are used for composite sealing at the bottom and fixed by an oil seal baffle 26. A sealing ring 4 is installed circumferentially on the guide 5 to ensure that no oil and gas leakage occurs inside the shock absorber under high pressure, thereby obtaining a good driving experience.

[0004] However, after the single oil seal guide structure has been used for a long time, the gas in the empty spring cavity is prone to backflow, that is, from the top area of ​​the guide 5 into the bottom area of ​​the guide 5, and then into the single cylinder of the shock absorber, resulting in a decrease in the internal sealing and vacuum degree of the shock absorber. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to prevent the gas in the empty spring cavity from easily flowing back into the single cylinder of the shock absorber after the single oil seal guide structure is used for a long time, resulting in a decrease in the internal sealing and vacuum degree of the shock absorber.

[0006] The utility model solves the above technical problems through the following technical means: a double oil seal guide, including a guide, the inner walls of the top and bottom ends of the guide are both provided with installation grooves, and composite oil seals are provided in the two installation grooves, and the composite oil seals include an inner lip oil seal and an outer lip oil seal, and the inner lip oil seal can be against the inner wall of the installation groove through the outer lip oil seal.

[0007] As a preferred technical solution, a first step fitting portion is provided on the inner wall of the outer lip oil seal, and a second step fitting portion matched with the first step fitting portion is provided on the inner lip oil seal.

[0008] As a preferred technical solution, the inner wall of the outer lip oil seal is formed with an annular groove, which forms the first step matching portion, and the inner lip oil seal is formed with an annular protrusion, which forms the second step matching portion, and the annular groove can be against the annular protrusion.

[0009] As a preferred technical solution, the inner lip oil seal includes a fluororubber oil seal, and the outer lip oil seal includes a nitrile rubber oil seal.

[0010] As a preferred technical solution, the outer lip oil seal includes a composite oil seal 1, and the inner lip oil seal includes a composite oil seal 2.

[0011] As a preferred technical solution, the top inner diameter of the inner lip oil seal arranged at the top end of the guide is smaller than the bottom inner diameter, and the top inner diameter of the inner lip oil seal arranged at the bottom end of the guide is larger than the bottom inner diameter.

[0012] As a preferred technical solution, the outer lip oil seal is arranged outside the inner lip oil seal and is coaxial with the axis of the inner lip oil seal.

[0013] As a preferred technical solution, a sealing ring installation groove is provided on the outer wall of the guide.

[0014] As a preferred technical solution, an oil seal baffle is also riveted and fixed on the mounting groove.

[0015] An air spring shock absorber comprises a double oil seal guide, wherein the inner wall of the guide is also provided with a guide sleeve which is slidably matched with a piston rod.

[0016] The beneficial effects of the utility model are:

[0017] (1) In the present invention, a composite oil seal, namely an inner lip oil seal and an outer lip oil seal, is arranged at the top of the guide. When the piston rod moves downward, the inner lip oil seal can seal the piston rod to prevent external gas from entering the shock absorber.

[0018] (2) In the present invention, the inner lip oil seal is made of fluororubber oil seal and the outer lip oil seal is made of nitrile rubber oil seal, thereby improving the service life and sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the guide oil seal structure provided as the background technology of the utility model;

[0020] Figure 2 A schematic diagram of the guide oil seal structure provided in Example 1 of the utility model;

[0021] Figure 3 A schematic cross-sectional structure diagram of an air spring shock absorber provided in Example 2 of the utility model;

[0022] Figure numbers: 1. Oil seal baffle 1; 2. Composite oil seal 1; 3. Guide sleeve; 4. Sealing ring 1; 5. Guide; 6. Oil seal baffle 2; 7. Composite oil seal 2; 8. Sealing ring 2. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] See also Figure 2 A double oil seal guide comprises a guide 5, wherein the top and bottom of the guide 5 are both provided with a composite oil seal 1 2 and a composite oil seal 2 7, wherein the top and bottom of the guide 5 are both provided with mounting grooves adapted to the composite oil seal 1 2 and the composite oil seal 2 7, wherein the top and bottom of the guide 5 are also connected with an oil seal baffle 1 1 and an oil seal baffle 2 6, wherein the top of the guide 5 is connected with the oil seal baffle 1 1 to limit the composite oil seal 1 and the composite oil seal 2 7 at the top of the guide 5, and the bottom of the guide 5 is connected with the oil seal baffle 1 After the baffle plate 2 6 is clamped and fixed, it forms a limit for the composite oil seal 1 2 and the composite oil seal 2 7 at the bottom end of the guide 5. The top and bottom ends of the guide 5 are also provided with limit buckles that are compatible with the oil seal baffle plate 1 and the oil seal baffle plate 2 6. The oil seal baffle plate 1 and the oil seal baffle plate 2 6 are fixed by riveting, so that the oil seal baffle plate 1 and the oil seal baffle plate 2 6 are installed in the area where the corresponding limit buckles are located, and the opening of the installation groove is sealed, and the composite oil seal 1 2 can be against the inner wall of the installation groove through the composite oil seal 2 7.

[0026] See also Figure 2 The inner wall of the composite oil seal 2 is stepped to form a first step fitting portion, and the composite oil seal 2 7 is provided with a second step fitting portion matched with the first step fitting portion; its sealing performance is further enhanced, an annular groove is formed on the inner wall of the composite oil seal 2, and the annular groove forms the first step fitting portion, and an annular protrusion is formed on the composite oil seal 2 7, and the annular protrusion forms the second step fitting portion, and the annular groove can be against the annular protrusion.

[0027] The cross section of the composite oil seal 27 at the top end of the guide 5 is in a right figure eight shape, and the cross section of the composite oil seal 27 at the bottom end of the guide 5 is in an inverted figure eight shape; the top inner diameter of the composite oil seal 27 at the top end of the guide 5 is smaller than the bottom inner diameter, and the top inner diameter of the composite oil seal 27 at the bottom end of the guide 5 is larger than the bottom inner diameter;

[0028] The composite oil seal 1 2 is coaxially arranged with the composite oil seal 2 7 and is located outside the composite oil seal 2 7. The composite oil seal 2 7 adopts a fluororubber oil seal, and the composite oil seal 1 2 adopts an NBR (nitrile rubber) oil seal.

[0029] See also Figure 2 The outer wall of the guide 5 is also provided with two annular grooves, one of which forms a sealing ring installation groove in which a sealing ring 4 is installed, and the other groove is used for fixing with the air spring shock absorber.

[0030] It should be noted that the material of the oil seal baffle 1 and the oil seal baffle 2 6 is steel, the material of the sealing ring 4 is nitrile rubber, and the material of the guide 5 is aluminum.

[0031] Working principle: When the air-spring shock absorber is stretched, the damping piston moves upward, which will bring high pressure to the composite oil seal 2 and the composite oil seal 27 at the bottom of the guide 5. Since the composite oil seal 27 is in an inverted "eight" shape, the oil seal lip of the composite oil seal 27 presses the piston rod tightly, and the oil cannot impact the oil seal to ensure that the oil inside the shock absorber will not spray out or leak; when the air-spring shock absorber is compressed, the damping piston moves downward, and the oil seal at the mouth of the composite oil seal 27 at the top of the guide 5 is in a positive "eight" shape, and the oil seal lip of the composite oil seal 27 presses the piston rod tightly, and the high-pressure gas in the air spring cannot impact the composite oil seal 27 to ensure that external gas will not cross-flow, reduce the vacuum degree of the shock absorber moving cavity, weaken the shock absorber performance, and ensure that the internal damping performance of the shock absorber is not affected by the external environment (air spring), thereby improving the service life of the product and the user's driving experience.

[0032] Example 2

[0033] See also Figure 3 , an empty spring shock absorber, including the double oil seal guide in Example 1, and the inner wall of the guide 5 is also equipped with a guide sleeve 3 in contact with the piston rod.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double oil seal guide, characterized in that: It includes a guide, and the inner walls of the top and bottom ends of the guide are both provided with installation grooves. Composite oil seals are provided in the two installation grooves. The composite oil seals include an inner lip oil seal and an outer lip oil seal. The inner lip oil seal can be against the inner wall of the installation groove through the outer lip oil seal.

2. A double oil seal guide according to claim 1, characterized in that: The inner wall of the outer lip oil seal is provided with a first step matching portion, and the inner lip oil seal is provided with a second step matching portion matched with the first step matching portion.

3. A double oil seal guide according to claim 2, characterized in that: An annular groove is formed on the inner wall of the outer lip oil seal, and the annular groove forms the first step matching portion. An annular protrusion is formed on the inner lip oil seal, and the annular protrusion forms the second step matching portion. The annular groove can be abutted against the annular protrusion.

4. A double oil seal guide according to claim 1, characterized in that: The inner lip oil seal comprises a fluororubber oil seal, and the outer lip oil seal comprises a nitrile rubber oil seal.

5. A double oil seal guide according to claim 1, characterized in that: The outer lip oil seal includes a first composite oil seal, and the inner lip oil seal includes a second composite oil seal.

6. A double oil seal guide according to claim 1, characterized in that: The inner diameter of the top of the inner lip oil seal arranged at the top end of the guide is smaller than the inner diameter of the bottom, and the inner diameter of the top of the inner lip oil seal arranged at the bottom end of the guide is larger than the inner diameter of the bottom.

7. A double oil seal guide according to claim 1, characterized in that: The outer lip oil seal is arranged outside the inner lip oil seal and is coaxial with the inner lip oil seal axis.

8. A double oil seal guide according to claim 1, characterized in that: The outer wall of the guide is provided with a sealing ring installation groove.

9. A double oil seal guide according to claim 1, characterized in that: An oil seal baffle is also riveted and fixed on the installation groove.

10. An air spring shock absorber, characterized in that: It comprises a double oil seal guide as described in any one of claims 1 to 9, wherein the inner wall of the guide is also provided with a guide sleeve which is slidably matched with the piston rod.

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