Oil seal and shock absorber

Abstract

The utility model discloses an oil seal and a shock absorber, and relates to the technical field of oil seal design, the oil seal is used for being arranged on a guider of the shock absorber and between a piston rod and an outer cylinder, and the outer wall of the oil seal is provided with a vent groove communicated with two end faces of the oil seal. After the oil seal provided by the utility model is assembled and before spinning sealing, when the piston rod moves downwards, air in the shock absorber can be exhausted from the vent groove, so that the oil seal is prevented from bulging out when the piston rod moves downwards, subsequent spinning sealing of an outer cylinder is facilitated, and the yield is improved.

Description

Technical Field

[0001] This utility model relates to the field of shock absorber technology, and in particular to an oil seal and a shock absorber. Background Technology

[0002] Oil seals are common sealing components in shock absorber structures. During shock absorber assembly, when the oil seal enters the outer cylinder, the outer diameter is compressed, causing the outer circle to fit tightly against the inner wall of the outer cylinder, thus sealing the inside of the shock absorber. When the piston rod moves downward, the pressure inside the shock absorber increases, which can easily cause the oil seal to bulge out of the outer cylinder, preventing it from being properly sealed by spin-forming. Utility Model Content

[0003] The purpose of this invention is to provide an oil seal and a shock absorber to solve the problems existing in the prior art and improve the yield rate.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides an oil seal for use on the guide of a shock absorber and between the piston rod and the outer cylinder. The outer wall of the oil seal is provided with a venting groove that connects the two ends of the oil seal.

[0006] Preferably, multiple ventilation slots are provided.

[0007] Preferably, the venting grooves are arranged evenly around the circumference of the oil seal.

[0008] Preferably, it includes a skeleton and a rubber body, the rubber body covering the skeleton, and the ventilation groove is formed on the rubber body.

[0009] Preferably, the bottom of the rubber body is provided with an annular sealing body, which is used to be fitted over the annular boss at the top of the guide, and the axial length of the sealing body is greater than the axial length of the annular boss.

[0010] Preferably, at least a portion of the outer wall of the sealing body is used for clearance fitting with the outer cylinder.

[0011] Preferably, the ventilation groove extends circumferentially along the outer wall of the rubber body.

[0012] Preferably, the depth of the vent groove is 0.01-1mm; the projection of the bottom surface of each vent groove along the axial direction of the oil seal is an arc, and the arc is located on a circular trajectory; the angle between the two ends of the arc and the two connecting lines of the center of the circular trajectory is not less than 20°.

[0013] This utility model also provides a shock absorber, including a piston rod, an inner cylinder, a guide, an outer cylinder, and an oil seal as described above.

[0014] Preferably, the bottom of the oil seal has an annular sealing body and an annular sealing tongue. The sealing body surrounds the sealing tongue, and an annular groove is formed between the sealing body and the sealing tongue. The top of the guide has an annular boss that extends into the annular groove. Before the spin seal, there is a gap between the bottom surface of the annular groove and the top surface of the annular boss. At least part of the outer wall of the sealing body has a gap with the outer cylinder. After the spin seal, the bottom surface of the annular groove and the top surface of the annular boss fit tightly together, and the outer wall of the sealing body fits tightly with the inner wall of the outer cylinder.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] After the oil seal provided by this utility model is installed, when the piston rod moves down before the spin sealing, the air in the shock absorber will be discharged from the vent groove, thereby preventing the oil seal from bulging out when the piston rod moves down, which facilitates the subsequent spin sealing of the outer cylinder and improves the yield. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the shock absorber after the oil seal is assembled and spun-sealed in the relevant technology.

[0019] Figure 2 A schematic diagram of the structure of the oil seal provided in an embodiment of this utility model;

[0020] Figure 3 for Figure 2 A bottom view;

[0021] Figure 4 To be Figure 2 A schematic diagram showing the oil seal before it is spun sealed after assembly.

[0022] In the diagram: 1-Oil seal; 2-Skeleton; 3-Sealing body; 4-Sealing tongue; 5-Rubber body; 6-Ventilation groove; 7-Annular groove; 8-Outer cylinder; 9-Guide.

[0023] 101 - Piston rod in related technologies; 102 - Oil seal in related technologies; 103 - Guide in related technologies; 104 - Inner cylinder in related technologies; 105 - Outer cylinder in related technologies. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] First, some technical terms involved in the embodiments of this application will be introduced.

[0027] Spin sealing is the process of bending the upper edge of the outer cylinder inward and pressing the oil seal in place after the oil seal is installed on the guide and between the piston rod and the outer cylinder.

[0028] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0029] This utility model provides an oil seal 1, which is used to be installed on the guide 9 of the shock absorber and between the piston rod and the outer cylinder 8. The outer wall of the oil seal 1 is provided with a venting groove 6 that connects the two ends of the oil seal 1.

[0030] After the oil seal 1 provided by this utility model is assembled, before the spin sealing, when the piston rod moves downward, the air in the shock absorber will be discharged from the vent groove 6, thereby preventing the oil seal 1 from bulging out when the piston rod moves downward, thus facilitating the subsequent spin sealing of the outer cylinder 8. Since the upper edge of the outer cylinder 8 folds inward to press the oil seal 1 after spin sealing, this process often causes the oil seal 1 to deform, thereby improving the sealing effect. It is understandable that the solution provided by this utility model essentially weakens the sealing performance of the oil seal 1 before spin sealing. However, since the oil seal 1 is made of elastic material, and usually during spin sealing, the oil seal 1 deforms along the axial or height direction, thereby enhancing its sealing performance for the shock absorber.

[0031] It should be noted that the above-mentioned end faces refer to the end faces of the oil seal 1 along the length of the piston rod when the oil seal 1 is assembled. When the oil seal 1 is a rotating body, the above-mentioned end faces refer to the faces of the two ends of the oil seal 1 in the axial direction.

[0032] In some embodiments, multiple ventilation slots 6 are provided.

[0033] This embodiment is provided with multiple ventilation slots 6 to improve the exhaust effect. Of course, in some examples, only one ventilation slot 6 may be provided.

[0034] This application does not impose any restrictions on the shape of the venting groove 6. For example, the cross-section can be arc-shaped, square, strip-shaped, or various irregular shapes, as long as it can vent the gas inside the shock absorber before assembly.

[0035] When multiple venting grooves 6 are provided, the multiple venting grooves 6 are preferably arranged evenly around the oil seal 1 in sequence. However, in some embodiments, the multiple venting grooves 6 may also be unevenly distributed, and this utility model does not limit this.

[0036] In some embodiments, the system includes a skeleton 2 and a rubber body 5, with the rubber body 5 covering the skeleton 2 and a ventilation groove 6 formed on the rubber body 5.

[0037] In some embodiments, the bottom of the rubber body 5 is provided with an annular sealing body 3, which is used to fit over the annular boss on the top of the guide 9. The length of the sealing body 3 extending axially is greater than the length of the annular boss extending axially.

[0038] This embodiment further weakens the sealing performance of the oil seal 1 to the shock absorber before the oil seal 1 is spun sealed, so as to facilitate the discharge of gas inside the shock absorber. After the spun seal is completed, the sealing body 3 is deformed and shortened to the same length as the annular boss, thereby enhancing the sealing effect.

[0039] In some embodiments, at least a portion of the outer wall of the sealing body 3 is used for clearance fitting with the outer cylinder 8.

[0040] This embodiment further weakens the sealing performance of the oil seal 1 to the shock absorber before the oil seal 1 is spun sealed, so as to facilitate the discharge of gas inside the shock absorber. After the spun seal is completed, the sealing body 3 is deformed and its length is shortened, and its cross-sectional area is increased to fit tightly with the outer cylinder 8 to enhance the sealing effect.

[0041] In some embodiments, the ventilation groove 6 extends circumferentially along the outer wall of the rubber body 5.

[0042] Specifically, such as Figure 3 As shown, the depth of the vent groove 6 is 0.01-1mm; the projection of the bottom surface of each vent groove 6 along the axial direction of the oil seal is an arc, and the arc is located on a circular trajectory; the angle between the two ends of the arc and the two connecting lines of the center of the circular trajectory is not less than 20°.

[0043] In this embodiment, the vent groove 6 is relatively shallow, ranging from 0.01 to 1 mm, so that after the spin sealing is completed, it can be filled and the sealing effect enhanced by the axial and radial deformation of the oil seal.

[0044] This utility model also provides a shock absorber, including a piston rod, an inner cylinder, a guide 9, an outer cylinder 8, and an oil seal 1 as in the above embodiment.

[0045] This embodiment possesses all the advantages of the above embodiments, and will not be repeated here.

[0046] In some embodiments, the bottom of the oil seal 1 is constructed with an annular sealing body 3 and an annular sealing tongue 4. The sealing body 3 is arranged around the sealing tongue 4, and an annular groove 7 is formed between the sealing body 3 and the sealing tongue 4. The top of the guide 9 is constructed with an annular boss that extends into the annular groove 7. Before the spin sealing, there is a gap between the bottom surface of the annular groove 7 and the top surface of the annular boss. At least part of the outer wall of the sealing body 3 has a gap with the outer cylinder 8. After the spin sealing, the bottom surface of the annular groove 7 and the top surface of the annular boss are tightly fitted together, and the outer wall of the sealing body 3 is tightly fitted with the inner wall of the outer cylinder 8.

[0047] This embodiment further weakens the sealing performance of the oil seal 1 to the shock absorber before the oil seal 1 is spun sealed, so as to facilitate the discharge of gas inside the shock absorber. After the spun seal is completed, the sealing body 3 is deformed and shortened in length, and the cross-sectional area is increased to fit tightly with the outer cylinder 8 and to be the same length as the annular boss, thereby enhancing the sealing effect.

[0048] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An oil seal for use on the guide of a shock absorber and between the piston rod and the outer cylinder, characterized in that: The outer wall of the oil seal is provided with a venting groove that connects the two ends of the oil seal.

2. The oil seal according to claim 1, characterized in that: The ventilation slots are provided in multiple ways.

3. The oil seal according to claim 2, characterized in that: The venting grooves are arranged evenly around the circumference of the oil seal.

4. The oil seal according to claim 1, characterized in that: It includes a skeleton and a rubber body, the rubber body covering the skeleton, and the ventilation groove is formed on the rubber body.

5. The oil seal according to claim 4, characterized in that: The bottom of the rubber body is constructed with an annular sealing body, which is used to fit over the annular boss at the top of the guide. The axial length of the sealing body is greater than the axial length of the annular boss.

6. The oil seal according to claim 5, characterized in that: At least a portion of the outer wall of the sealing body is used for clearance fitting with the outer cylinder.

7. The oil seal according to claim 4, characterized in that: The ventilation groove extends circumferentially along the outer wall of the rubber body.

8. The oil seal according to claim 7, characterized in that: The depth of the vent groove is 0.01-1mm; the projection of the bottom surface of each vent groove along the axial direction of the oil seal is an arc, and the arc is located on a circular trajectory; the angle between the two ends of the arc and the two connecting lines of the center of the circular trajectory is not less than 20°.

9. A shock absorber, characterized in that: It includes a piston rod, an inner cylinder, a guide, an outer cylinder, and an oil seal as described in any one of claims 1 to 8.

10. The shock absorber according to claim 9, characterized in that: The bottom of the oil seal has an annular sealing body and an annular sealing tongue. The sealing body surrounds the sealing tongue, and an annular groove is formed between the sealing body and the sealing tongue. The top of the guide has an annular boss that extends into the annular groove. Before the spin seal, there is a gap between the bottom surface of the annular groove and the top surface of the annular boss. At least part of the outer wall of the sealing body has a gap with the outer cylinder. After the spin seal, the bottom surface of the annular groove and the top surface of the annular boss fit tightly together, and the outer wall of the sealing body fits tightly with the inner wall of the outer cylinder.

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