Multi-lip differential oil seal

Abstract

The utility model discloses a multi-lip differential oil seal which comprises an outer oil seal body, an inner oil seal body is fixedly connected to the inner wall of the outer oil seal body, a connecting groove is formed in the inner oil seal body, an air bag ring is fixedly connected in the connecting groove, an auxiliary lip is fixedly connected in the air bag ring, an air cavity is formed in the air bag ring, and an auxiliary lip is fixedly connected in the auxiliary lip. A gas cavity is formed in the outer oil seal, carbon dioxide gas is filled in the gas cavity, a framework is embedded in the outer oil seal, the section of the framework is of a T-shaped structure, a mounting groove is formed in one side of the inner oil seal, a tightening groove is formed in the inner side wall of the mounting groove, and a tightening spring is clamped in the tightening groove. According to the inner oil seal, the air bag ring, the auxiliary lip, the air cavity and the like are arranged, when the temperature of the inner oil seal rises, the temperature is transmitted to the air bag ring, carbon dioxide gas in the air bag ring is heated to expand, the air bag ring is driven to expand at the same time, the air bag ring drives the auxiliary lip to be tightly attached to the rotating shaft, the sealing performance is improved, and the risk of grease leakage is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil seal technical field especially, it relates to multi-lip differential oil seal. BACKGROUND

[0002] Multi-lip oil seal is a kind of device for rotating shaft sealing, its core feature is to design multiple elastic sealing lips on single oil seal structure, it is usually used in automobile differential and gearbox and other components, but oil seal works and shell or rotating shaft exist relative rotation, if shell or oil seal processing precision is low in use process, it is easy to damage, for this, authorization disclosure No.

[0003] But in the scheme, outer oil seal and inner oil seal sliding connection, inner oil seal rotates and still can produce abrasion with outer oil seal friction, increase the risk of oil leakage from the connecting place of inner oil seal and outer oil seal, for this, multi-lip differential oil seal is proposed. UTILITY MODEL CONTENTS

[0004] The utility model discloses a multi-lip differential oil seal to solve the shortcomings in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: multi-lip differential oil seal, including outer oil seal, the inner wall of outer oil seal is fixedly connected with inner oil seal, the inside of inner oil seal is equipped with connecting groove, connecting groove is fixedly connected with gasbag ring in, the inside of gasbag ring is fixedly connected with vice lip.

[0006] As a further description of the above technical scheme:

[0007] The inside of gasbag ring is equipped with air cavity, and the air cavity is filled with carbon dioxide gas.

[0008] As a further description of the above technical scheme:

[0009] The inside of outer oil seal is embedded with framework, and the cross section of the framework is T-shaped structure.

[0010] As a further description of the above technical scheme:

[0011] One side of inner oil seal is equipped with installation groove, and the inner side wall of installation groove is provided with tight hoop groove, and tight hoop spring is clamped in the inside of tight hoop groove.

[0012] As a further description of the above technical solution:

[0013] The inner wall of the inner oil seal is fixedly connected to a main lip, which is located on one side of the secondary lip.

[0014] As a further description of the above technical solution:

[0015] The inner wall of the inner oil seal is fixedly connected to a dustproof lip, which is located on the other side of the secondary lip.

[0016] As a further description of the above technical solution:

[0017] Both the main lip and the secondary lip are made of fluororubber, and their contact surfaces are coated with a PTFE wear-resistant coating.

[0018] This utility model has the following beneficial effects:

[0019] Compared with existing technologies, this multi-lip differential oil seal, by setting up an air bladder ring, a secondary lip, and an air chamber, allows the temperature of the inner oil seal to rise, which is then transferred to the air bladder ring. This causes the carbon dioxide gas inside the air bladder ring to expand due to the heat, which in turn causes the air bladder ring to expand. The air bladder ring then causes the secondary lip to fit tightly against the rotating shaft, improving sealing performance and reducing the risk of grease leakage. Attached Figure Description

[0020] Fig. 1 This is a three-dimensional structural diagram of the multi-lip differential oil seal proposed in this utility model;

[0021] Fig. 2 This is a cross-sectional view of the multi-lip differential oil seal proposed in this utility model;

[0022] Fig. 3 This is a cross-sectional view of the inner oil seal of the multi-lip differential oil seal proposed in this utility model;

[0023] Fig. 4 This is a cross-sectional view of the air bladder ring of the multi-lip differential oil seal proposed in this utility model.

[0024] Legend:

[0025] 1. Outer oil seal; 2. Inner oil seal; 3. Connecting groove; 4. Airbag ring; 5. Secondary lip; 6. Air chamber; 7. Frame; 8. Mounting groove; 9. Main lip; 10. Hoop groove; 11. Hoop spring; 12. Dustproof lip. Detailed Implementation

[0026] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all the other embodiments obtained by the ordinary skilled in the art without creative work belong to the protection scope of the present utility model.

[0027] With reference to Figs. 1 to 4 The multi-lip differential oil seal provided by the present utility model comprises an outer oil seal 1, a skeleton 7 embedded in the inner part of the outer oil seal 1, the cross section of the skeleton 7 being in T-shaped structure, an inner oil seal 2 fixedly connected to the inner wall of the outer oil seal 1, an installation groove 8 formed on one side of the inner oil seal 2, a tight hoop groove 10 provided on the inner side wall of the installation groove 8, a tight hoop spring 11 clamped in the tight hoop groove 10, a main lip 9 fixedly connected to the inner wall of the inner oil seal 2, the main lip 9 being located on one side of a secondary lip 5, a dust lip 12 fixedly connected to the inner wall of the inner oil seal 2, the dust lip 12 being located on the other side of the secondary lip 5, the main lip 9 and the secondary lip 5 both being made of fluorine rubber material, and PTFE wear-resistant coating being provided on the contact surfaces of the main lip 9 and the secondary lip 5, so that the wear resistance can be improved by the PTFE wear-resistant coating, and the service life of the oil seal is prolonged.

[0028] In order to improve the sealing performance, a connecting groove 3 is formed in the inner part of the inner oil seal 2, a gas bag ring 4 is fixedly connected in the connecting groove 3, a secondary lip 5 is fixedly connected to the inner part of the gas bag ring 4, a gas cavity 6 is formed in the inner part of the gas bag ring 4, and carbon dioxide gas is filled in the gas cavity 6. When the temperature of the inner oil seal rises, the temperature is transferred to the gas bag ring 4, the carbon dioxide gas in the inner part of the gas bag ring 4 is heated and expanded, and the gas bag ring 4 is expanded at the same time, so that the gas bag ring 4 drives the secondary lip 5 to closely adhere to the rotating shaft, the sealing performance is improved, and the risk of oil leakage is reduced.

[0029] Working principle: when the temperature of the inner oil seal rises, the temperature is transferred to the gas bag ring 4, the carbon dioxide gas in the inner part of the gas bag ring 4 is heated and expanded, and the gas bag ring 4 is expanded at the same time, so that the gas bag ring 4 drives the secondary lip 5 to closely adhere to the rotating shaft, the sealing performance is improved, and the risk of oil leakage is reduced.

[0030] Finally, it should be noted that: the above only for the preferred embodiments of the present utility model, and not for the limitation of the present utility model, although the present utility model has been described in detail with reference to the foregoing embodiments, for the skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model, should be included in the protection scope of the present utility model.

Claims

1. Multi-lip differential oil seal, comprising an outer oil seal (1), characterized in that: The inner wall of the outer oil seal (1) is fixedly connected with an inner oil seal (2), the inner oil seal (2) is provided with a connecting groove (3) in the inside, the connecting groove (3) is fixedly connected with an air bag ring (4) in the inside, and the air bag ring (4) is fixedly connected with a secondary lip (5) in the inside.

2. The multi-lip differential oil seal of claim 1, wherein: The air bag ring (4) is provided with an air cavity (6) in the inside, and the air cavity (6) is filled with carbon dioxide gas.

3. The multi-lip differential oil seal of claim 1, wherein: The inner wall of the outer oil seal (1) is embedded with a framework (7), and the cross section of the framework (7) is in a T-shaped structure.

4. The multi-lip differential oil seal of claim 1, wherein: One side of the inner oil seal (2) is provided with a mounting groove (8), the inner side wall of the mounting groove (8) is provided with a clamping groove (10), and the clamping groove (10) is clamped with a clamping spring (11) in the inside.

5. The multi-lip differential oil seal of claim 1, wherein: The inner wall of the inner oil seal (2) is fixedly connected with a primary lip (9), and the primary lip (9) is located at one side of the secondary lip (5).

6. The multi-lip differential oil seal of claim 1, wherein: The inner wall of the inner oil seal (2) is fixedly connected with a dustproof lip (12), and the dustproof lip (12) is located at the other side of the secondary lip (5).

7. The multi-lip differential oil seal of claim 5, wherein: The primary lip (9) and the secondary lip (5) are made of fluorine rubber material, and the contact surfaces of the primary lip (9) and the secondary lip (5) are provided with PTFE wear-resistant coating.

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