CN213655524U

CN213655524U - Low-pressure sealed long-life universal joint

Info

Publication number: CN213655524U
Application number: CN202021878896.0U
Authority: CN
Inventors: 牛杰; 邓海仲; 高天芬; 董小忠
Original assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Current assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-07-09
Anticipated expiration: 2030-09-01

Abstract

The utility model discloses a low pressure seal long-life universal joint relates to the car universal joint field, including the cross, oil blanket and outer lane, the outer lane suit is on the cross, set up the oil blanket between outer lane opening part and the cross axle journal, the oil blanket includes the transversal oil blanket skeleton and the sealed lip of personally submitting the zigzag, a plurality of air discharge duct A are evenly seted up with outer lane opening end face cooperation department to oil blanket skeleton, evenly set up a plurality of air discharge ducts B with outer lane internal diameter cooperation department on the oil blanket skeleton, air discharge duct B and air discharge duct A do not link up each other, the fillet by on the oil blanket skeleton separates, the outer lane opening part is equipped with the chamfer and is used for cooperating air discharge duct A, air discharge duct B forms exhaust passage, supply the inside gaseous. The utility model discloses a to universal joint seal structure optimal design, can realize can in time getting rid of the inside gas of bearing and heat again when guaranteeing the bearing leakproofness, improve bearing operational environment, extension universal joint life.

Description

Low-pressure sealed long-life universal joint

Technical Field

The utility model relates to a field of car universal joint, concretely relates to low pressure seal long-life universal joint.

Background

The universal joint is an important automobile transmission part and comprises a cross shaft, an oil seal, an outer ring, a rolling needle, a gasket and other functional parts. When the universal joint works, the bearing is lubricated by lubricating grease, and the friction among the outer ring, the roller pin and the cross shaft is reduced, so that the service life of the universal joint is ensured. The sealing structure has the effects of preventing grease leakage, ensuring the lubricating effect and simultaneously isolating foreign matters such as external muddy water from invading. The oil seal is designed into one or more lips to be in interference fit with the cross shaft, and the oil seal is pressed into the outer ring in the interference fit mode, so that the bearing is completely sealed with the outside. In the operation process of the universal joint, the gas pressure in the universal joint is increased due to the heat generated by the friction of the bearing, and the gas pressure pushes the oil seal to be loosened or deformed, so that the sealing is failed, and the grease is leaked. The technical scheme of the prior art is that the sealing performance of an oil seal is improved by utilizing a spring compensation type sealing design, and a vent hole with a smaller diameter is additionally arranged at a lip of the oil seal, so that the internal and external air pressure of a bearing is balanced, the damage of a sealing structure of a universal joint caused by the air pressure is avoided, and the service life of the universal joint is ensured.

For example, chinese patent 2019205389353 discloses a long-life universal joint that can exhaust and not leak oil, set up the oil blanket between the axle journal including outer lane and bearing, the oil blanket is equipped with the skeleton, exhaust duct and sealing lip, the skeleton is "L" shape and cooperatees with the outer lane and installs, the sealing lip that sets up in the oil blanket bottom is circular protrusion, be provided with the arc recess on the sealing fitting surface of oil blanket and cross, sealing lip and arc recess mutually support and form the buckle formula and be connected, it has inside and external exhaust duct of intercommunication bearing to open up in the oil blanket for discharge the inside gaseous of producing of bearing to the external world.

For example, chinese patent 2019207173705 discloses a universal joint with a breathable sealing structure, which includes a cross shaft, a dust cover, an oil seal, a shaft sleeve, a needle retainer, needles, a gasket, and a 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.

For another example, chinese patent 2019214206953 discloses a maintenance-free universal joint sealing structure with combined exhaust holes, which includes an assembly, the assembly is composed of a cross shaft and a bearing, the bearing is composed of a shaft sleeve, an oil seal, a roller pin, a dust cover and a gasket, the shaft sleeve and the dust cover are mutually matched and connected and are sleeved on the cross shaft together, the oil seal is arranged between the opening of the shaft sleeve and the cross shaft, the gasket is arranged between the bottom of the shaft sleeve and the cross shaft, the roller pin is arranged between the oil seal and the gasket, the oil seal is provided with an exhaust passage, the oil seal is provided with 3 layers of lips, and two lips close to the inner side are respectively provided with three exhaust.

The above prior art solutions mainly have the following drawbacks:

1. the vent hole with smaller diameter is arranged on the lip of the oil seal, and because the lip is made of elastic rubber material, the hole meeting the requirement is difficult to accurately open, the die is more complex, the process is difficult to realize, and the processing cost is higher;

2. in the universal joint operation process, the diameter of a cross shaft surface is extruded with an oil seal lip, so that the shape of a lip vent hole is changed or blocked easily, the exhaust function is influenced, and the original design purpose is violated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art existence, and provide a low pressure seal long-life universal joint, solve current cross universal joint bearing exhaust hole and make difficulty, the unable discharge of inside gas leads to inside temperature and pressure to continuously rise, leads to the oil blanket oil leak inefficacy to reduce universal joint life's problem.

The purpose of the utility model is accomplished through following technical scheme: the low-pressure sealing universal joint with long service life comprises a cross shaft, an oil seal and an outer ring, wherein the outer ring is sleeved on the cross shaft, the oil seal is arranged between an opening of the outer ring and a shaft neck of the cross shaft, the oil seal comprises an oil seal framework and a sealing lip opening, the cross section of the oil seal framework is Z-shaped, a plurality of exhaust grooves A are uniformly formed in the matching position of the oil seal framework and the end surface of the opening of the outer ring, a plurality of exhaust grooves B are uniformly formed in the matching position of the oil seal framework and the inner diameter of the outer ring, the exhaust grooves B are not communicated with the exhaust grooves A and are separated by round corners on the oil seal framework, and chamfers are arranged at the opening; and a sealing lip arranged close to the oil seal framework is connected and sealed with the shaft neck of the cross shaft.

Preferably, the number of the exhaust grooves a and the number of the exhaust grooves B are equal, and the exhaust grooves a and the exhaust grooves B are in one-to-one correspondence and perpendicular to each other.

According to the preferable technical scheme, the exhaust grooves A and the exhaust grooves B are arranged in a staggered mode at a certain angle, and a labyrinth type exhaust channel is formed by matching with a chamfer at an opening of the outer ring.

The utility model has the advantages that:

1. an exhaust mechanism is designed on the oil seal framework, so that the gas pressure generated in the bearing during working can be effectively released, and the stability of the sealing structure is ensured; compared with the oil seal lip opening, the design and processing are simple, the cost is lower, the exhaust hole is not easy to deform, and the exhaust is stable;

2. the friction and heat generation of the bearing can be reduced while the framework is used for exhausting air, the internal pressure of the bearing is further reduced, and the service life of the universal joint is prolonged;

3. the design of the vent hole utilizes different flow phases and viscosity tension differences of gas and liquid, so that grease leakage can be effectively prevented, and gas discharge can be ensured;

4. the cooperation of the oblique chamfer of the outer ring opening and the oil seal framework is ingeniously utilized, the exhaust hole is designed into two sections of non-through grooves, grooving at the chamfer is avoided, the production, stamping and other forming processes are convenient, and the service life of the die can be effectively prolonged.

Drawings

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

Fig. 2 is a partially enlarged schematic view of a region a in fig. 1.

Fig. 3 is a schematic structural view of the oil seal skeleton in example 1.

Description of reference numerals: the oil seal comprises a cross shaft 1, an oil seal 2, an exhaust groove A21, an exhaust groove B22, an oil seal framework 23, a seal lip 24 and an outer ring 3.

Detailed Description

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

example 1: as shown in the attached drawing 1, the low-pressure sealing universal joint with long service life comprises a cross shaft 1, an oil seal 2 and an outer ring 3, wherein the outer ring 3 is sleeved on the cross shaft 1, and the oil seal 2 is arranged between the opening of the outer ring 3 and the shaft neck of the cross shaft 1. As shown in fig. 2, the oil seal 2 includes an oil seal framework 23 (the cross section is in a zigzag shape) and a sealing lip 24, a plurality of exhaust grooves a21 are uniformly formed at the matching position of the oil seal framework 23 and the opening end face of the outer ring 3, a plurality of exhaust grooves B22 are uniformly formed at the matching position of the oil seal framework 23 and the inner diameter of the outer ring 3, the exhaust grooves B22 and the exhaust grooves a21 are not communicated with each other and are separated by a fillet on the oil seal framework 23 (namely, the exhaust grooves B22 and the exhaust grooves a21 are only extended to the fillet tangent point), and a chamfer is arranged at the opening of the outer ring 3 and is used for matching with the exhaust grooves a21 and the exhaust grooves B22 to form an; a sealing lip 24 arranged close to the oil seal framework 23 is connected and sealed with the shaft neck of the cross shaft 1.

As shown in fig. 3, the exhaust grooves a21 and B22 are equal in number, corresponding in position and perpendicular to each other. Preferably, the size of the air discharge groove A21 and the air discharge groove B22 is extremely small, so that the air passing standard is met, but lubricating grease with certain viscosity is not easy to discharge from the grooves, and the purposes of air discharge and oil storage are achieved.

Example 2: the difference from the embodiment 1 is that the exhaust grooves A21 and B22 are arranged in a staggered mode at a certain angle, and an exhaust channel with a labyrinth structure is formed by matching with a chamfer at the opening of the outer ring 3.

The utility model discloses a theory of operation: during the operation of the universal joint, the internal gas pressure of the universal joint is increased due to the friction heat of the bearing, and as shown in fig. 2, the gas firstly passes through the exhaust groove B22, then enters the chamfer of the opening of the outer ring 3, and then is exhausted out of the universal joint through the exhaust groove A21, so that the internal pressure of the bearing is reduced. Meanwhile, the design of the exhaust groove utilizes different flow phases and viscosity tension differences of gas and liquid, so that lubricating grease can be effectively prevented from leaking, and gas exhaust can be ensured. In addition, the design of the non-through grooves at the two ends can avoid slotting at the chamfer of the oil seal framework 23, facilitate the production, stamping and other forming processes, and effectively prolong the service life of the die.

The utility model discloses a to universal joint seal structure optimal design, can realize can in time getting rid of the inside gas of bearing and heat again when guaranteeing the bearing leakproofness, improve bearing operational environment, extension universal joint life. The designed universal joint bearing exhaust structure is convenient to produce and process, can effectively reduce the cost of the bearing for arranging the exhaust hole, has no influence on the lip structure of the oil seal, and can ensure the sealing effect of the lip.

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. The utility model provides a low pressure seal long-life universal joint, includes cross (1), oil blanket (2) and outer lane (3), outer lane (3) suit is on cross (1), sets up oil blanket (2), its characterized in that between outer lane (3) opening part and cross (1) axle journal: the oil seal (2) comprises an oil seal framework (23) with a Z-shaped cross section and a seal lip (24), a plurality of exhaust grooves A (21) are uniformly formed in the matching position of the oil seal framework (23) and the opening end face of the outer ring (3), a plurality of exhaust grooves B (22) are uniformly formed in the matching position of the oil seal framework (23) and the inner diameter of the outer ring (3), the exhaust grooves B (22) are not communicated with the exhaust grooves A (21) and are separated by a round angle on the oil seal framework (23), and a chamfer is arranged at the opening of the outer ring (3) and is used for matching with the exhaust grooves A (21) and the exhaust grooves B (22) to form an exhaust channel for exhausting gas in the cross shaft (1); a sealing lip (24) which is arranged close to the oil seal framework (23) is connected and sealed with the shaft neck of the cross shaft (1).

2. The low pressure sealed long life gimbal of claim 1, wherein: the number of the exhaust grooves A (21) is equal to that of the exhaust grooves B (22), and the exhaust grooves A and the exhaust grooves B are in one-to-one correspondence and perpendicular to each other.

3. The low pressure sealed long life gimbal of claim 1, wherein: the exhaust groove A (21) and the exhaust groove B (22) are arranged in a staggered mode at a certain angle, and a labyrinth type exhaust channel is formed by matching with a chamfer at the opening of the outer ring (3).