CN210344073U

CN210344073U - Universal joint with breathable sealing structure

Info

Publication number: CN210344073U
Application number: CN201920717370.5U
Authority: CN
Inventors: 叶连强; 牛杰
Original assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Current assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-04-17
Anticipated expiration: 2029-05-20

Abstract

The utility model discloses a universal joint with a breathing type sealing structure, which mainly comprises a cross shaft, a dust cover, an oil seal, a shaft sleeve, a needle roller retainer ring, a needle roller, a gasket and a shaft head; the oil seal is provided with a herringbone outer lip and a herringbone inner lip, the outer lip is used for isolating dust, silt and the like in an external environment, and the inner lip is close to the roller pin and used for sealing the inside of the bearing; the inner lip is provided with three exhaust channels for exhausting high-pressure gas in the cross shaft, the three exhaust channels are uniformly distributed at 120 degrees and form an upward oblique angle on the inner lip, and the opening parts of the three exhaust channels are positioned at higher relative positions. The utility model discloses under the condition that does not change the sealed dustproof construction of universal joint, does not influence the universal joint motion state, only through designing neotype "breathable type" oil blanket, effectively reduce the oil leak risk, guarantee sealing stability, improve universal joint assembly efficiency.

Description

Universal joint with breathable sealing structure

Technical Field

The utility model relates to a field of car cross axle universal joint, concretely relates to but universal joint of respiratory seal structure.

Background

The maintenance-free universal joint is more and more widely applied to an automobile transmission system, and the maintenance-free universal joint is higher than a common maintenance type universal joint in terms of sealing performance and integral service life. However, when the maintenance-free universal joint encounters a more complex working environment in working, some defects still exist, particularly, friction heat is generated in high-speed working, high air pressure is formed due to high internal tightness, gas is difficult to discharge, and internal high pressure exerts force on an oil seal to loosen the oil seal, so that grease leakage loses the sealing effect, and finally the universal joint fails. In addition, when the maintenance-free universal joint is assembled, the cross shaft is not easy to assemble with the bearing, because the oil seal and the dust cover are in interference fit with the journal of the cross shaft, the radial clearance of the bearing is small, the air tightness is good, and the air pressure in a sealed space is large during installation, so that the bearing is not installed in place and is easy to jack out.

In the current market, no novel sealing structure exists for the problem, and a general solution is to increase the interference fit between an oil seal and a shaft sleeve, but the excessive increase of the interference can cause deformation of the oil seal during assembly, difficult assembly and the like; there is also a solution to reduce the interference fit between the oil seal and the cross shaft, but reducing the interference affects the sealing performance, and grease may leak while gas is exhausted at high pressure. These solutions do not solve the problem of grease leakage, so it is necessary to develop a new oil seal structure to effectively discharge the negative pressure gas generated by the gap change and frictional heat generation during the high-speed operation of the universal joint, prevent the lubricating grease from flowing out, protect the sealing performance, reduce the assembly difficulty, and solve the problem that the bearing is not easy to be installed in place.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art existence, and provide a but the universal joint of respiratory seal structure.

The purpose of the utility model is accomplished through following technical scheme: the universal joint with the breathable sealing structure mainly comprises a cross shaft, a dustproof cover, an oil seal, shaft sleeves, roller pin retaining rings, roller pins, gaskets and shaft heads, wherein the shaft sleeves are sleeved on four shaft heads of the cross shaft; the oil seal is provided with a herringbone outer lip and a herringbone inner lip, the outer lip is used for isolating dust, silt and the like in an external environment, and the inner lip is close to the roller pin and used for sealing the inside of the bearing; the inner lip is provided with three exhaust channels for exhausting high-pressure gas in the cross shaft, the three exhaust channels are uniformly distributed at 120 degrees and form an upward oblique angle on the inner lip, and the opening parts of the three exhaust channels are positioned at higher relative positions.

The number of the exhaust passages can be any number.

The utility model has the advantages that: under the condition that does not change the sealed dustproof construction of universal joint, do not influence the universal joint motion state, only through designing neotype "breathable" oil blanket, effectively reduce the oil leak risk, guarantee sealing stability, improve universal joint assembly efficiency.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a front view structure schematic diagram of the oil seal.

Fig. 3 is a schematic sectional view of the oil seal.

Description of reference numerals: the universal joint pin comprises a universal joint pin 1, a dust cover 2, an oil seal 3, an outer lip 31, an inner lip 32, an exhaust passage 33, a shaft sleeve 4, a needle roller retainer ring 5, a needle roller 6, a gasket 7 and a shaft head 8.

Detailed Description

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

example (b): as shown in the attached drawings, the universal joint with the breathable sealing structure mainly comprises a cross shaft 1, a dust cover 2, an oil seal 3, a shaft sleeve 4, a roller pin retainer ring 5, roller pins 6, gaskets 7 and shaft heads 8, wherein the four shaft heads 8 of the cross shaft 1 are sleeved with the shaft sleeve 4, the gaskets 7 are arranged between the bottom of the shaft sleeve 4 and the end surface of the shaft head 8, the plurality of roller pins 6 are arranged between the inner circle of the shaft sleeve 4 and the outer circle of the shaft head 8, the oil seal 3 is arranged at the opening part of the shaft sleeve 4, the roller pin retainer ring 5 is arranged between the oil seal 3 and the roller; the oil seal 3 is provided with a herringbone outer lip 31 and an herringbone inner lip 32, the outer lip 31 is used for isolating dust, silt and the like in an external environment, and the inner lip 32 is close to the roller pin 6 and used for sealing the inside of the bearing to protect grease in the bearing from leakage; be provided with three exhaust passage 33 that are used for discharging high-pressure gas in the cross on the inner lip 32, do not set up too much passageway, can reduce the oil leak risk, the exhaust passage diameter is less, satisfies gaseous accessible standard, is 120 evenly distributed between three exhaust passage 33 to be oblique ascending angle on inner lip 32, make its oral area be in higher relative position, guarantee that gas can pass through, and the grease has certain stickness, generally adheres to in lip below and cross axle journal surface, thereby is difficult for passing through.

The number of the exhaust passages 33 may be any number.

The utility model discloses the scheme adopts and adds the less exhaust passage of diameter on the lip in the oil blanket, can breathe formula oil blanket promptly, is a neotype oil blanket structure, effectively reduces because of the universal joint high atmospheric pressure that forms in inside confined space when high-speed during operation, guarantees seal structure stability to be favorable to the universal joint assembly.

It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.

Claims

1. A universal joint with a breathable sealing structure mainly comprises a cross shaft (1), a dust cover (2), an oil seal (3), shaft sleeves (4), roller pin retaining rings (5), roller pins (6), gaskets (7) and shaft heads (8), wherein the shaft sleeves (4) are sleeved on four shaft heads (8) of the cross shaft (1), the gaskets (7) are arranged between the bottom of the shaft sleeves (4) and the end faces of the shaft heads (8), a plurality of roller pins (6) are arranged between the inner circle of the shaft sleeves (4) and the outer circle of the shaft heads (8), the oil seal (3) is installed at the opening part of the shaft sleeves (4), the roller pin retaining rings (5) are arranged between the oil seal (3) and the roller pins (6), and the dust cover (2; the method is characterized in that: an outer lip (31) and an inner lip (32) which are herringbone are arranged on the oil seal (3), and the inner lip (32) is close to the roller pin (6) and used for sealing the inside of the bearing; the inner lip (32) is provided with three exhaust channels (33) for discharging high-pressure gas in the cross shaft, the three exhaust channels (33) are uniformly distributed at 120 degrees and are inclined upwards at the inner lip (32), so that the opening parts of the exhaust channels are positioned at higher relative positions.

2. A universal joint of a breathable sealing structure according to claim 1, wherein: the number of the exhaust passages (33) may be any number.