CN201103687Y

CN201103687Y - Split combined double-lip grease seal

Info

Publication number: CN201103687Y
Application number: CNU2007200285571U
Authority: CN
Inventors: 吕春霞
Original assignee: QINGDAO HILYWILL SEALING CO Ltd
Current assignee: Qingdao Hilywill Advanced Materials Technology Co., Ltd.
Priority date: 2007-09-30
Filing date: 2007-09-30
Publication date: 2008-08-20
Anticipated expiration: 2017-09-30

Abstract

The utility model provides a double-lip oil seal of splitting combined type, solving the problems in the prior art of poor concentricity, stability and reliability and short service life of an inner oil seal and an outer oil seal. The technical proposal of the utility model is that: the double-lip oil seal comprises an inner oil seal consisting of an inner framework, a shaft sealing body and an outer sealing body and an outer oil seal consisting of an outer framework, a shaft sealing body and a hole sealing body, and is characterized in that the cross section of the inner framework is an L shape; the perimeter of the inner framework is coated by a rubber body to form the outer sealing body; the inner oil seal is pressed into a cavity of the outer framework through the outer sealing body of the inner oil seal; the outer sealing body and the cavity of the outer framework are in interference fit. The inner oil seal and the outer oil seal of the splitting combined type double-lip oil seal have the advantages of high concentricity, good sealing effect, high stability and reliability and long service life.

Description

Separate assembling lips oil seal

Technical field

The utility model relates to a kind of seal arrangement that is applicable to automobile, engineering machinery, relates in particular to the rotation shaft seal.

Background technique

Automobile back wheel hub rubber oil sea, it is made up of inside and outside two oil sealings, and each oil sealing includes skeleton and rubbery sealed body.Existing oil sealing is to form a circle flange by the inner frame periphery, encases outer skeleton periphery and forms a fixed connection.But find that through using for a long time this oil sealing exists following deficiency: 1. inside and outside skeleton is the metal stamping goods, flange assembling fitting surface is shorter, and span is big, connect built on the sand, the inside and outside oil sealing concentricity of easier generation is poor, assembles not in place, problem such as assembling deflection etc., and then influences the structure of oil sealing and the stability of performance, cause stability and poor reliability, working life is low.2. because inside and outside skeleton forms one, when greater impact load that rotatingshaft produces once in a while, the position that is hit easily deforms and can not recover, thereby makes whole oil sealing lose seal action, causes the oil sealing leakage of oil to cause discarding.3. because inside and outside skeleton is by being connected between sheet metal and the sheet metal, the assembling difficulty, operation is various, and manufacturing efficiency is low.4. because the inner frame of outsourcing is exposed outside, the probability that corrosion damage lost efficacy in rugged environment is big.5. the secondary lip of outer oil seal and the sealing lip of inner oil seal closely overlap, and the common surface of contact of lap-joint and running shaft is big, and servo-actuated is poor, do not have the space of distortion, this position often takes place wear and tear simultaneously, and common the damage caused leakage, are difficult to realize double-sealing truly.

The model utility content

The utility model provides a kind of separate assembling lips oil seal, it is poor that it can solve the inside and outside oil sealing concentricity of prior art existence, stability and poor reliability, and working life is low, deforming is difficult for recovering, and easily produces problems such as corrosion and servo-actuated difference.

In order to reach the purpose that solves the problems of the technologies described above, the technical solution of the utility model is, a kind of separate assembling lips oil seal, comprise inner oil seal and outer oil seal, inner oil seal is made of inner frame, shaft sealing body and external sealed body, outer oil seal is made of outer skeleton, shaft sealing body and hole seal, it is characterized in that described inner frame section configuration is L shaped shape, the rubber-coated body of inner frame periphery forms the external sealed body, described inner oil seal is pressed in the inner chamber of outer skeleton by its external sealed body, and the external sealed body of described inner oil seal is an interference fit with outer skeleton inner chamber.

In the technical solution of the utility model, also have following technical characteristics: gapped between the shaft sealing body of described inner oil seal and the shaft sealing body of outer oil seal, described interstice coverage is 0.5-3.0mm.

In the technical solution of the utility model, also have following technical characteristics: described external sealed body is 0.1-0.3mm with the magnitude of interference of outer skeleton inner chamber.

In the technical solution of the utility model, also have following technical characteristics: external of the external sealed of described inner frame is corrugated structure.

In the technical solution of the utility model, also have following technical characteristics: the shaft sealing body of described inside and outside skeleton is main lip and secondary lip formula structure.

In the technical solution of the utility model, also have following technical characteristics: the main lip in the shaft sealing body of described inside and outside skeleton is provided with at least one circle return wire.

In the technical solution of the utility model, also has following technical characteristics: described inner frame periphery height 〉=outer skeleton inner chamber height 0.45.

In the technical solution of the utility model, also have following technical characteristics: described outer oil seal skeleton section is special-shaped skeleton.

The utility model compared with prior art has the following advantages and good effect:

1. the steel plate between the existing inside and outside skeleton is connected, be improved between the inside and outside skeleton and do not connect, but be fitted in the inner chamber of outer skeleton by the external sealed body interference of inner frame, the skeleton inner chamber is a locating basis beyond the assembling fitting surface, and the cooperation face length, inside and outside oil sealing concentricity height, good sealing effect, stability and reliability improve, long service life.

2. gapped between the shaft sealing body of the shaft sealing body of inner oil seal and outer oil seal, the sealing area of two separations of formation, oil sealing has deformation space, and is good with the servo-actuated of running shaft, reduced wearing and tearing, formed effectively sealing again.

3. the inner oil seal in the combined type oil sealing is that the rubber mold pressing forms in the rubber body, and dimensionally stable, and rubber is elastomer makes that assembling is simple to be realized easily, and adopts a step operation can finish assembling, has improved manufacturing efficiency.

4. the skeleton exposed part reduces, and the corrosion probability reduces, and has improved working life equally.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is the half sectional view of the utility model separate assembling lips oil seal.

10. outer oil seal; 11. shaft sealing body; 12. main lip; 13. secondary lip; 14. spring; 15. outer skeleton; 16. hole seal; 17. outer skeleton inner chamber; H. outer skeleton inner chamber height;

20. inner oil seal; 21. shaft sealing body; 22. main lip; 23. secondary lip; 24. spring; 25. inner frame; 25-1. inner frame periphery; 26. external sealed body; H. the inner frame periphery highly;

δ. the gap.

Embodiment

Referring to Fig. 1, outer oil seal 10 comprises shaft sealing body 11, outer skeleton 15 and hole seal 16.Shaft sealing body 11 is main lip 12 and secondary lip 13 structures.Outer skeleton 15 is made for the steel plate punching press, and its section is special-shaped skeleton, outer skeleton 15 outer attachment hole seals 16, and seal 16 outer surfaces in hole are ripple, are beneficial to sealing.

Inner oil seal 20 is made of inner frame 25, shaft sealing body 21 and external sealed body 26, and inner frame 25 is similarly the steel plate punching press and makes.

Inner frame 25 section configurations of inner oil seal 20 are approximately L shaped shape, and shaft sealing body 21 is equipped with at the place, hole in the middle of the inner frame 25, and shaft sealing body 21 is main lip 22 and secondary lip 23 formula structures.

Inner oil seal 20 is during with outer oil seal 10 assemblings, and the peripheral 25-1 of inner frame 25 is coated with external sealed body 26, and inner frame 25 together is pressed into 17 li of the inner chambers of outer skeleton 15 by its external sealed body 26, thereby makes inner oil seal 20 and outer oil seal 10 be mounted to one.External sealed body 26 adopts interference fit with outer skeleton inner chamber 17, and magnitude of interference is 0.1-0.3mm.The size of magnitude of interference is selected and should be determined according to the factors such as size of the rotation diameter of axle.Height h 〉=outer skeleton inner chamber height 0.45H of inner frame periphery 25-1.In the present embodiment, h is 0.55H.The external sealed body 26 of inner oil seal 20 is corrugated, is beneficial to fitting surface and tightens the location mutually.

Gapped δ between the shaft sealing body 21 of inner oil seal 20 and the shaft sealing body 11 of outer oil seal 10, the gap delta scope is 0.5-3.0mm.Retention gap can make the servo-actuated raising of oil sealing and running shaft, and then improves the sealing and the reliability of oil sealing, and working life.

The main lip of the shaft sealing body 21 of inner frame 20 is provided with a circle return wire for 22 mouthfuls, and the main lip 12 of the shaft sealing body 11 of same outer skeleton 10 also is provided with a circle return wire.

Shaft

sealing body

11,21, hole seal 16 and external sealed body 26 adopt nitrile butadiene rubber to make.

The above, it only is preferred embodiment of the present utility model, be not to be the restriction of the utility model being made other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solutions of the utility model according to technical spirit of the present utility model.

Claims

1. separate assembling lips oil seal, comprise inner oil seal and outer oil seal, inner oil seal is made of inner frame, shaft sealing body and external sealed body, outer oil seal is made of outer skeleton, shaft sealing body and hole seal, it is characterized in that described inner frame section configuration is L shaped shape, the rubber-coated body of inner frame periphery forms the external sealed body, and described inner oil seal is pressed in the inner chamber of outer skeleton by its external sealed body, and the external sealed body of described inner oil seal is an interference fit with outer skeleton inner chamber.

2. oil sealing according to claim 1 is characterized in that between the shaft sealing body of the shaft sealing body of described inner oil seal and outer oil seal gappedly, and described interstice coverage is 0.5-3.0mm.

3. oil sealing according to claim 2 is characterized in that the described external sealed body and the magnitude of interference of outer skeleton inner chamber are 0.1-0.3mm.

4. oil sealing according to claim 3 is characterized in that external of the external sealed of described inner frame is corrugated structure.

5. oil sealing according to claim 4, the shaft sealing body that it is characterized in that described inside and outside skeleton are main lip and secondary lip formula structure.

6. oil sealing according to claim 5 is characterized in that the main lip in the shaft sealing body of described inside and outside skeleton is provided with at least one circle return wire.

7. according to any described oil sealing of claim in the claim 1 to 6, it is characterized in that described inner frame periphery height 〉=outer skeleton inner chamber height 0.45.

8. oil sealing according to claim 7 is characterized in that described outer oil seal skeleton section is special-shaped skeleton.