CN213594023U

CN213594023U - Sealing device for axle drive axle of heavy-duty engineering vehicle

Info

Publication number: CN213594023U
Application number: CN202022052003.3U
Authority: CN
Inventors: 赛海滨
Original assignee: Laiyang Changyu Sealing Technology Co ltd
Current assignee: Laiyang Changyu Sealing Technology Co ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-07-02
Anticipated expiration: 2030-09-18

Abstract

The utility model discloses a sealing device for an axle drive axle of a heavy-duty engineering vehicle, which comprises a shaft sleeve and a bearing, and comprises an outer seal and an inner oil seal, wherein the outer seal is a combined oil seal consisting of a dustproof cover and an oil seal and is used for blocking the entering of external dust, earth and rainwater; the inner oil seal is a shaft seal and is used for sealing medium oil inside the axle; the outer seal and the inner oil seal are matched with the shaft sleeve to form a sealing system; the axle sleeve is equipped with one and the coaxial shoulder hole of hole, and the laminating of the outer terminal surface of its axial plane and bearing inner race, the surface fit of face of cylinder and bearing inner race, the utility model discloses combined the advantage of combination oil blanket and bearing seal, adopted inside and outside twice sealed, solved and blockked the contradiction that external environment dust and sealed inside medium can not compromise simultaneously, had simple structure, characteristics with low costs.

Description

Sealing device for axle drive axle of heavy-duty engineering vehicle

Technical Field

The utility model belongs to the technical field of the sealed of heavy-duty car axle, especially, relate to a sealing device for heavy-duty drive axle is sealed.

Background

The traditional shaft seal structure is mostly adopted in the existing axle drive axle seal, the basic structure of the axle drive axle seal structure comprises an oil seal lip with a spring, one is clearance fit's dustproof lip with the axle, as shown in figure 1, for improving the dustproof effect, the application generally adopts the mode of arranging 2 oil seals in the same direction of the axial direction, because of the reason of the structure, the structure does not have any problem in the aspect of the inside medium oil of the sealed axle, but fly upward at dust, muddy water mud, the construction adverse environment of the construction site of a puddle, the outside dust and impurity just invades the inside of the oil seal very fast, cause the serious abrasion of the oil seal lip, thereby the sealing system fails.

In addition, although some applications adopt a combined sealing structure design capable of effectively blocking the external severe environment, due to unreasonable assembly method (the dustproof cover and the oil seal of the combined oil seal are separated during assembly), sealing failure caused by the reversal of the sealing lip of the oil seal often occurs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to improve the not enough of prior art and provide one kind and combined the advantage of oil blanket and bearing seal, adopt inside and outside twice sealed, solved and blockked the contradiction that external environment dust and sealed inside medium can not compromise simultaneously, solved the problem, the simple structure of the lip upset that traditional oil blanket exists when the assembly, with low costs is used for heavy load engineering car axle transaxle's sealing device.

The utility model aims at realizing the sealing device for the axle driving axle of the heavy-duty engineering vehicle, which comprises a shaft sleeve and a bearing, and is characterized in that the sealing device comprises an outer seal and an inner oil seal, wherein the outer seal is a combined oil seal consisting of a dustproof cover and an oil seal and is used for blocking the entering of external dust, earth and rainwater; the inner oil seal is a shaft seal and is used for sealing medium oil inside the axle; the outer seal and the inner oil seal are matched with the shaft sleeve to form a sealing system; the shaft sleeve is provided with a stepped hole which is coaxial with the inner hole, the axial surface of the stepped hole is attached to the outer end surface of the bearing inner ring, and the cylindrical surface of the stepped hole is matched with the outer surface of the bearing inner ring.

In order to further realize the utility model discloses a purpose, can be that the oil blanket spring lip and the axial lip of oil blanket distribute towards the external world in the external seal, axial lip and the interior surface interference fit of shield terminal surface form the axial seal face, and the lateral surface interference fit of radial lip and shield hole forms radial seal, and oil blanket excircle inner wall forms clearance seal with the excircle terminal surface of shield.

In order to further realize the purpose of the utility model, the inner seal can be a double-lip structure, and the small lip on the outer side is in interference fit with the shaft.

Compared with the prior art, the utility model has the following characteristics of showing and positive effect: the utility model discloses an inside and outside twice oil blanket is sealed, the external seal is the combination oil blanket, the spring lip and the axial lip of oil blanket all distribute towards the external world, axial lip and the interior surface interference fit of shield end face form the axial seal face, radial lip and the lateral surface interference fit of shield hole form the radial seal face, oil blanket excircle inner wall and the excircle terminal surface of shield form the small clearance and seal, above-mentioned three seal structure can prevent effectively that external dust, earth and rainwater from getting into the oil blanket inside, in addition, the lip surface coating at axial and radial seal interface has lubricating grease, also play fine effect of adsorbing muddy water; the inner oil seal is a typical shaft seal structure and is used for sealing medium oil in the axle, the inner oil seal oil is arranged on the inner side of the outer oil seal, external dust and impurities are blocked by the outer oil seal, and the service life of the inner oil seal is greatly prolonged; the outer oil seal and the inner oil seal are matched with the shaft sleeve to form a complete sealing system; the lower end of the shaft sleeve is provided with a coaxial stepped hole, when the oil seal is assembled, firstly, the axial surface of the stepped hole is attached to the upper end surface of the bearing inner ring, and the radial cylindrical surface is matched with the outer surface of the bearing inner ring, so that the reliable positioning of the shaft sleeve and the bearing inner ring is ensured; then an inner oil seal is assembled, the outer circle of the inner oil seal is in interference fit with the outer ring of the bearing to form a static sealing part, and lip rubber is in interference fit with the outer ring of the shaft sleeve to form a dynamic sealing part. Assembling the outer oil seal according to the same method, so that the outer circle of the outer oil seal is in interference fit with the bearing outer ring, and the lip rubber is in interference fit with the shaft sleeve outer ring; when assembling the outer oil seal, firstly the dust cap and the oil seal of the oil seal are assembled together, and then the dust cap and the oil seal are assembled on the shaft sleeve simultaneously, so that the spring lip of the oil seal can be effectively prevented from overturning during assembly. The utility model combines the advantages of the combined oil seal and the shaft seal, and well solves the contradiction that the dust blocking the external environment and the medium in the seal can not be simultaneously considered; in addition, different from the traditional sealing system, the utility model improves the traditional shaft sleeve structure, thus when the outer oil seal is assembled, the spring lip of the oil seal can be ensured not to turn over, and the problem of lip turning existing in the traditional oil seal during assembly is well solved; compare with traditional sealing system, the utility model discloses sealing system simple structure, it is with low costs, the installation is reliable.

Drawings

Fig. 1 is a schematic diagram of a structure in the prior art.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a partial enlarged view of the present invention.

In the figure: 1. the device comprises an outer seal, 2 an inner oil seal, 3 a shaft sleeve, 4 a bearing, 11 a dust cover, 12 an oil seal, 31 and a coaxial stepped hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A sealing device for an axle driving axle of a heavy-duty engineering vehicle, referring to fig. 2 and 3, comprises a shaft sleeve 3 and a bearing 4, and the sealing device has two seals: the outer seal 1 and the inner oil seal 2; the outer seal 1 is a combined oil seal, wherein a spring lip and an axial lip of the oil seal 12 are distributed towards the outside, the axial lip is in interference fit with the inner surface of the end face of the dust cover 11 to form an axial sealing surface, the radial lip is in interference fit with the outer side surface of an inner hole of the dust cover 11 to form a radial sealing surface, the inner wall of the outer circle of the oil seal 12 and the end face of the outer circle of the dust cover 11 form small-gap sealing, and lubricating grease is coated on the surface of a lip opening of the axial and radial sealing interfaces. The inner oil seal 2 is arranged on the inner side of the outer oil seal 1, and the inner oil seal 2 is a typical shaft seal structure; the outer seal 1 and the inner oil seal 2 are matched with the shaft sleeve 3 to form a complete sealing system.

The lower end of the shaft sleeve 3 is provided with a coaxial stepped hole structure 31, when the oil seal is assembled, firstly, the axial surface of the stepped hole structure 31 is attached to the upper end surface of the inner ring of the bearing 4, and the radial cylindrical surface is matched with the outer surface of the inner ring of the bearing 4, so that the reliable positioning of the shaft sleeve 3 and the inner ring of the bearing 4 is ensured; then the inner seal 2 and the outer seal 1 are assembled. When the outer seal 1 is assembled, the dust cap 11 and the oil seal 12 of the oil seal are assembled together and then assembled on the shaft sleeve 3.

The utility model discloses not only be limited to the heavy-duty car, be applicable equally to dregs car, the road sweeper that the engineering was used.

Claims

1. A sealing device for an axle drive axle of a heavy-duty engineering vehicle comprises a shaft sleeve and a bearing, and is characterized by comprising an outer seal and an inner oil seal, wherein the outer seal is a combined oil seal consisting of a dustproof cover and an oil seal and used for preventing external dust, soil and rainwater from entering; the inner oil seal is a shaft seal and is used for sealing medium oil inside the axle; the outer seal and the inner oil seal are matched with the shaft sleeve to form a sealing system; the shaft sleeve is provided with a stepped hole which is coaxial with the inner hole, the axial surface of the stepped hole is attached to the outer end surface of the bearing inner ring, and the cylindrical surface of the stepped hole is matched with the outer surface of the bearing inner ring.

2. The sealing device for the axle drive axle of the heavy-duty engineering vehicle as claimed in claim 1, wherein an oil seal spring lip and an axial lip of the oil seal in the outer seal are distributed towards the outside, the axial lip is in interference fit with the inner surface of the end face of the dust cap to form an axial sealing surface, the radial lip is in interference fit with the outer side face of the inner hole of the dust cap to form a radial seal, and the outer circle inner wall of the oil seal and the outer circle end face of the dust cap form a clearance seal.

3. The sealing device for the axle drive axle of the heavy-duty engineering truck as claimed in claim 1, wherein the inner seal has a double-lip structure, and the small lip on the outer side is in interference fit with the axle.