Framework structure for oil seal and oil seal comprising same

Abstract

The utility model relates to the technical field of oil seals, in particular to a framework structure for an oil seal and the oil seal with the framework structure, the framework structure comprises a main framework and an auxiliary framework, the main framework is provided with a shaft hole through which a piston to be sealed penetrates, and the auxiliary framework is arranged around the shaft hole by a circle; the oil seal is additionally provided with a rubber body on the basis that the oil seal comprises the framework structure, the rubber body covers the sealing end face and the non-sealing end face of the main framework, and the rubber body covering the sealing end face of the main framework extends in the positive axial direction of the shaft hole to form a sealing lip. The rubber body covering the non-sealing end face of the main framework extends in the negative axial direction of the shaft hole to form a dustproof lip. According to the framework structure for the oil seal and the oil seal comprising the framework structure, the service life of the oil seal can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to a skeleton structure for an oil seal and an oil seal containing the skeleton structure. Background Art

[0002] An oil seal is a common name for a general seal. Simply put, it is the seal of lubricating oil and is a mechanical component used to seal grease. It isolates the components that need lubrication in the transmission components from the output components, so as to prevent the leakage of lubricating oil. A combined oil seal is composed of multiple oil seals combined by interference fit. Due to its multiple sealing properties, the combined oil seal is widely used in the sealing of shock absorbers.

[0003] In a single-tube shock absorber, the oil seal is directly stressed by the pressure in the upper chamber of the piston and requires high pressure resistance. Therefore, a combined oil seal is often selected. The invention patent with the authorization announcement number CN212106763U discloses a low-friction sealing system for a shock absorber. The sealing system in this patent mainly consists of three components, namely an oil seal, a dust seal, and a support ring. However, the movement of the shaft easily destroys the fit between the two halves of the combined oil seal, thereby destroying the sealing performance of the combined oil seal and shortening the service life of the combined oil seal. At the same time, in order to maintain the sealing performance, the combined oil seal is designed to have a sufficient radial force in its structure. For example, in the support ring disclosed in the above patent, the support ring provides a large support axial force for the sealing lip, but at the same time, it also increases the radial force between the oil seal and the piston. The large radial force increases the friction force between the combined oil seal and the shaft, and the combined oil seal is easily damaged under long-term wear. Summary of the Utility Model

[0004] Technical Objective: In order to overcome the deficiencies in the prior art, the utility model provides a skeleton structure for an oil seal and an oil seal containing the skeleton structure.

[0005] Technical Solution: To achieve the above objective, a skeleton structure for an oil seal disclosed by the utility model includes:

[0006] A main skeleton, and a shaft hole through which a piston to be sealed passes is provided on the main skeleton;

[0007] A sub-skeleton, and the sub-skeleton is arranged around the shaft hole in a circle.

[0008] Preferably, a stepped surface is provided on the circumferential side wall of the shaft hole. The head end of the sub-skeleton in the axial direction is bent towards the circumferential side wall of the shaft hole to the stepped surface, and the tail end of the sub-skeleton in the axial direction is bent towards the circumferential side wall of the shaft hole to the sealing end surface of the main skeleton; the part between the head end and the tail end of the sub-skeleton encloses a cylindrical shape.

[0009] Preferably, a protrusion for supporting the sealing lip is formed by bending at the tail end of the sub-skeleton in the axial direction.

[0010] Preferably, the main skeleton is made of SPAH440 material, and the auxiliary skeleton is made of DC01 material.

[0011] An oil seal includes the above-mentioned skeleton structure for the oil seal and a rubber body;

[0012] Define the side of the main skeleton facing the seal as the sealing end face, and define the side of the main skeleton facing the non-seal as the non-sealing end face. The rubber body is covered on the sealing end face and the non-sealing end face of the main skeleton. The rubber body covered on the sealing end face of the main skeleton extends along the positive axial direction of the shaft hole to form a sealing lip, and the rubber body covered on the non-sealing end face of the main skeleton extends along the negative axial direction of the shaft hole to form a dust-proof lip.

[0013] Preferably, it further includes a spring, and the spring is arranged around the sealing lip in a circle.

[0014] Preferably, a secondary support lip and a tertiary support lip are arranged on the inner side of the sealing lip, and the tertiary support lip is arranged above the secondary support lip.

[0015] The utility model has the following technical effects:

[0016] (1) The oil seal structure of the present utility model adopts an integrated sealing structure. During the movement of the piston to be sealed, the oil seal structure can always remain integrated, reducing the damage to the oil seal structure caused by the movement of the piston and ensuring the service life of the piston;

[0017] (2) The present utility model innovatively creates a skeleton structure, which is composed of a main skeleton and an auxiliary skeleton. The main skeleton plays a main supporting role, and the auxiliary skeleton plays a supporting role in the axial direction of the sealing lip. This skeleton can ensure the supporting effect of the sealing lip without increasing additional radial force, thereby reducing the friction between the piston and the present oil seal and further ensuring the service life of the piston. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of Embodiment 3;

[0019] Figure 2 It is a schematic structural diagram of Embodiment 1;

[0020] Figure 3 It is an enlarged view of the sealing lip in the present utility model;

[0021] Figure 4 It is a schematic structural diagram of the main skeleton in the present utility model.

[0022] In the figure, 1 is the main skeleton; 101 is the shaft hole; 102 is the step surface; 2 is the sub-skeleton; 201 is the protrusion; 3 is the rubber body; 301 is the sealing lip; 302 is the dust-proof lip; 303 is the second support lip; 304 is the third support lip; 4 is the spring; A is the sealing end face; B is the non-sealing end face; 5 is the piston to be sealed. Detailed implementation manners

[0023] The following combines the attached Figure 1 to the attached Figure 4 to describe the principles and features of the present utility model. The examples given are only used to explain the present utility model and are not used to limit the scope of the present utility model.

[0024] For the convenience of description, relevant orientations are first defined. Referring to the attached Figure 1 , the X direction is defined as the positive axial direction, and the Y direction is defined as the negative axial direction; referring to the attached Figure 4 , the A surface of the main skeleton 1 is defined as the sealing end face, and the B surface of the main skeleton 1 is defined as the non-sealing end face; the sealing end face A among the above faces the sealing cavity, and the non-sealing end face B among the above faces away from the sealing cavity.

[0025] Embodiment 1

[0026] As the most basic embodiment, a skeleton structure for an oil seal includes a main skeleton 1 and a sub-skeleton 2.

[0027] The main skeleton 1 is in a circular ring shape, and a shaft hole 101 through which the piston 5 to be sealed passes is provided at the central position of the main skeleton 1. A step surface 102 is provided on the circumferential side wall of the shaft hole 101, and the step surface 102 is close to the sealing end face A.

[0028] The sub-skeleton 2 is arranged around the shaft hole 101 in a circle. The head end of the sub-skeleton 2 in the axial direction is bent towards one side of the circumferential side wall of the shaft hole 101 to the step surface 102; the tail end of the sub-skeleton 2 in the axial direction is bent towards one side of the circumferential side wall of the shaft hole 101 to the sealing end face A of the main skeleton 1; and the part between the head end and the tail end of the sub-skeleton 2 encloses a cylindrical shape. It should be noted that: a protrusion 201 is formed by bending at the tail end of the sub-skeleton 2 in the axial direction, and the protrusion 201 can support the rubber attached to it.

[0029] In this embodiment, the main skeleton 1 is made of SPAH440 material, and the sub-skeleton 2 is made of DC01 material.

[0030] Embodiment 2

[0031] Apply the skeleton structure disclosed in Embodiment 1 to a specific oil seal structure, and the oil seal structure further includes a rubber body 3.

[0032] The rubber body 3 is covered on the sealing end face A and the non-sealing end face B of the main skeleton 1. The rubber body 3 covered on the sealing end face A of the main skeleton 1 extends along the positive axial direction of the shaft hole 101 to form a sealing lip 301, and the rubber body 3 covered on the non-sealing end face B of the main skeleton 1 extends along the negative axial direction of the shaft hole 101 to form a dust-proof lip 302. The sealing lip 301 above is used to prevent the lubricating oil in the sealing cavity from leaking, and the dust-proof lip 302 above is used to prevent external dust and other impurities from entering the sealing cavity. The protrusion 201 formed by bending the auxiliary skeleton 2 provides support for the sealing lip 301 while not increasing the radial force of the oil seal on the piston, and thus not increasing the friction force between the oil seal and the piston, ensuring the service life of the oil seal. A circle of second-stage support lips 303 and a circle of third-stage support lips 304 are arranged on the inner side of the sealing lip 301, and the third-stage support lips 304 are arranged above the second-stage support lips 303. The functions of the second-stage support lips 303 and the third-stage support lips 304 are both to further provide axial support force for the sealing lip 301.

[0033] Embodiment III

[0034] Compared with Embodiment II, a spring 4 is additionally added in this embodiment. The spring 4 is arranged around the sealing lip 301 for one circle, thereby increasing the shaft-holding force of the sealing lip 301.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A skeleton structure for an oil seal, characterized in that Comprising: A main skeleton (1), wherein a shaft hole (101) through which a piston to be sealed passes is provided on the main skeleton (1); A sub-skeleton (2), which is arranged around the shaft hole (101) in a circle.

2. The skeleton structure for an oil seal according to claim 1, characterized in that, A stepped surface (102) is provided on the circumferential side wall of the shaft hole (101). The axial head end of the sub-skeleton (2) is bent towards one side of the circumferential side wall of the shaft hole (101) to the stepped surface (102), and the axial tail end of the sub-skeleton (2) is bent towards one side of the circumferential side wall of the shaft hole (101) to the sealing end face (A) of the main skeleton (1); the part between the head end and the tail end of the sub-skeleton (2) encloses a cylindrical shape.

3. The skeleton structure for an oil seal according to claim 2, characterized in that, A protrusion (201) for supporting a sealing lip (301) is formed by bending at the axial tail end of the sub-skeleton (2).

4. The skeleton mechanism for an oil seal according to claim 2, characterized in that, The main skeleton (1) is made of SPAH440 material, and the sub-skeleton (2) is made of DC01 material.

5. An oil seal, characterized in that, Comprising: The skeleton structure for an oil seal according to any one of claims 2 to 4; A rubber body (3). Define the side face of the main skeleton (1) facing the seal as the sealing end face (A), and define the side of the main skeleton (1) facing the non-seal as the non-sealing end face (B). The rubber body (3) is covered on the sealing end face (A) and the non-sealing end face (B) of the main skeleton (1). The rubber body (3) covered on the sealing end face (A) of the main skeleton (1) extends along the positive axial direction of the shaft hole (101) to form a sealing lip (301), and the rubber body (3) covered on the non-sealing end face (B) of the main skeleton (1) extends along the negative axial direction of the shaft hole (101) to form a dust-proof lip (302).

6. The oil seal according to claim 5, characterized in that, It further includes a spring (4), and the spring (4) is arranged around the sealing lip (301) in a circle.

7. The oil seal according to claim 5, characterized in that, Two-way support lips (303) and three-way support lips (304) are provided on the inner side surface of the sealing lip (301), and the three-way support lips (304) are arranged above the two-way support lips (303).

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