CN211599325U - Combined type breathable sealed universal joint - Google Patents

Abstract

The utility model discloses a combined type breathable sealed universal joint, which relates to the field of automobile universal joints and mainly comprises a cross shaft, a dustproof cover, an oil seal, a shaft sleeve, needle roller check rings, needle rollers, gaskets and a shaft head, wherein the four shaft heads of the cross shaft are all sleeved with the shaft sleeve, the gaskets are arranged between the bottom of the shaft sleeve and the end surface of the shaft head, a plurality of needle rollers are arranged between the inner circle of the shaft sleeve and the excircle of the shaft head, the oil seal is arranged at the opening part of the shaft sleeve, the needle roller check rings are arranged between the oil seal and; the oil seal is provided with a front rubber lip and a rear rubber lip, a plurality of exhaust channels are uniformly distributed on the front rubber lip and the rear rubber lip, and the exhaust channels are inclined upwards to enable outlets of the exhaust channels to be located at positions higher than inlets. The utility model has the advantages that: the universal joint sealing dustproof structure is not changed, the movement state of the universal joint is not influenced, the oil leakage risk is effectively reduced through designing a novel combined breathable oil seal, the sealing stability is ensured, and the assembly efficiency of the universal joint is improved.

Description

Combined type breathable sealed universal joint

Technical Field

The utility model relates to a field of car universal joint, concretely relates to modular sealed universal joint that can breathe.

Background

Through the development of many years, the application of a maintenance-free universal joint in a vehicle transmission shaft is more and more favored by an automobile host factory. The maintenance-free universal joint has long service life, does not need maintenance in the follow-up process, reduces the cost and is once and for all. Therefore, the maintenance-free universal joint is higher and higher, and is generally applied to high-end new vehicles, so that the performance requirement of the maintenance-free universal joint is also quite strict. The prior maintenance-free universal joint still has the following defects:

1. when the universal joint is assembled, the universal joint and the bearing are not easy to assemble, because the oil seal and the dust cover are in interference fit with the journal of the universal joint, the radial clearance of the bearing is small, the air tightness is good, the air pressure of a sealed space is relatively large during installation, the bearing is not installed in place and is easy to eject out, negative pressure can be formed inside after forced installation, partial grease can be extruded and leaked, the grease quantity is insufficient, and the service life of the universal joint cannot meet the requirement;

2. when the universal joint works continuously at a high speed, because the universal joint generates heat through friction in continuous reciprocating rotation, high air pressure is formed in the internal high-tightness, when gas cannot be discharged, the internal high pressure can generate acting force on the oil seal to enable the oil seal to be loosened, the leaked grease loses the sealing effect, and finally the universal joint fails.

At present, no thorough solution is provided for the problems in the market, the general solution is to increase the interference fit between the oil seal and the shaft sleeve, but the excessive increase of the interference can cause the deformation of the oil seal during assembly, difficult assembly and the like. Or interference fit between the oil seal and the cross shaft is reduced, but interference is reduced, so that sealing performance is affected, and grease can be leaked 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 modular sealed universal joint that can breathe, have and effectively reduce the oil leak risk, guarantee sealing stability, improve the advantage of universal joint assembly efficiency.

The purpose of the utility model is accomplished through following technical scheme: the combined type breathable sealed universal joint 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 front rubber lip and a rear rubber lip, a plurality of exhaust channels are uniformly distributed on the front rubber lip and the rear rubber lip, and the exhaust channels are inclined upwards to enable outlets of the exhaust channels to be located at positions higher than inlets.

Further, set up two exhaust passage on the preceding rubber lip and be 180 distributions, also set up two exhaust passage on the back rubber lip and be 180 distributions, and set up the exhaust passage on the preceding rubber lip and set up the exhaust passage on the back rubber lip and stagger with 90.

Further, a nylon exhaust pipe is arranged in the exhaust channel.

The utility model has the advantages that: 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, but through designing neotype combination formula breathing 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 schematic structural view of the oil seal.

Fig. 3 is a sectional view a-a of fig. 2.

Description of reference numerals: the device comprises a cross shaft 1, a dust cover 2, an oil seal 3, a front rubber lip 3-1, a rear rubber lip 3-2, an exhaust passage 3-3, a nylon exhaust pipe 3-4, a shaft sleeve 4, a roller pin retainer ring 5, a roller pin 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 combined type breathable sealed universal joint mainly comprises a cross shaft 1, a dustproof 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, a 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 pins; the oil seal 3 is provided with a front rubber lip 3-1 and a rear rubber lip 3-2, the front rubber lip 3-1 is provided with two exhaust channels 3-3 which are distributed at an angle of 180 degrees, the rear rubber lip 3-2 is also provided with two exhaust channels 3-3 which are distributed at an angle of 180 degrees, and the exhaust channels 3-3 arranged on the front rubber lip 3-1 and the exhaust channels 3-3 arranged on the rear rubber lip 3-2 are staggered at an angle of 90 degrees; the exhaust channel 3-3 is angled obliquely upwards so that its outlet is at a higher level than the inlet.

Preferably, the exhaust channel 3-3 is internally provided with a nylon exhaust pipe 3-4, so that even if the oil seal 3 is deformed after being installed, the exhaust channel 3-3 cannot be blocked due to the existence of the nylon exhaust pipe 3-4.

Preferably, the diameter of the exhaust channel 3-3 is small, so that the gas passing standard is met, and grease leakage is reduced as much as possible.

The utility model discloses a theory of operation: the utility model has the advantages that the dust cover 2 and the oil seal 3 form a sealing structure, the dust cover 2 is mainly used for blocking dust, silt and the like in the external environment, and the oil seal 3 is mainly used for protecting the oil in the bearing from being leaked easily; when the oil seal 3 works, because the shaft head 8 inside generates heat through friction, high air pressure is generated, air is discharged from the exhaust channel 3-3 on the front rubber lip 3-1 close to one side of the roller pin 6, a small amount of grease can be discharged together, the rear rubber lip 3-2 arranged close to one side of the dust cover 2 can block the leaked small amount of grease, and finally, the air is discharged from the exhaust channel 3-3 on the rear rubber lip 3-2, so that the leakage of redundant grease can not occur; meanwhile, when the gas passes through the exhaust passage 3-3, the exhaust passage 3-3 forms an oblique angle on the rubber lip, the outlet of the exhaust passage is positioned at a position higher than the inlet of the exhaust passage, the gas can be ensured to pass through smoothly, and the grease has certain viscosity and is generally attached to the lower part of the rubber lip and the surface of the shaft neck of the cross shaft, so that the grease is not easy to pass through, and the amount of the grease which possibly leaks from the exhaust passage 3-3 is reduced.

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 (3)

1. A combined type breathable sealed universal joint comprises a cross shaft (1), a dustproof 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 dustproof cover (2) is; the method is characterized in that: the oil seal (3) is provided with a front rubber lip (3-1) and a rear rubber lip (3-2), a plurality of exhaust channels (3-3) are uniformly distributed on the front rubber lip (3-1) and the rear rubber lip (3-2), and the exhaust channels (3-3) are inclined upwards, so that outlets of the exhaust channels are positioned at a position higher than inlets of the exhaust channels.

2. The modular respirable seal gimbal of claim 1, wherein: the front rubber lip (3-1) is provided with two exhaust channels (3-3) which are distributed at an angle of 180 degrees, the rear rubber lip (3-2) is also provided with two exhaust channels (3-3) which are distributed at an angle of 180 degrees, and the exhaust channels (3-3) arranged on the front rubber lip (3-1) and the exhaust channels (3-3) arranged on the rear rubber lip (3-2) are staggered at an angle of 90 degrees.

3. The modular breathable sealed gimbal according to claim 1 or 2, wherein: a nylon exhaust pipe (3-4) is arranged in the exhaust channel (3-3).

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