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CN-121977070-A - Large-follow-up-amount driving half-shaft oil seal and hard-pie front-integrated steering drive axle for off-road vehicle

CN121977070ACN 121977070 ACN121977070 ACN 121977070ACN-121977070-A

Abstract

The invention discloses a large-follow-up driving half-shaft oil seal and a hard-pie off-road vehicle front integral steering drive axle, and belongs to the technical field of hard-pie off-road vehicle steering drive axles. The novel semi-shaft oil seal mainly comprises a semi-shaft inner oil seal, wherein the semi-shaft inner oil seal comprises an elastic support piece I, an oil-proof lip used for being in sealing fit with a driving half shaft is arranged at one end of the elastic support piece I, an elastic component capable of providing pretightening force is arranged in the oil-proof lip, an inner framework is arranged in a turning part of the elastic support piece I, which is close to one end of the oil-proof lip, and an outer framework is fixedly connected to the other end of the elastic support piece I. According to the invention, through the matching of the semi-shaft inner oil seal and the semi-shaft outer oil seal, the elastic deformation stroke of the axle housing welding assembly and the driving semi-shaft of more than 3mm under the working conditions of extreme leap of the hard off-road vehicle is realized, the problem of lip abrasion and breakage caused by insufficient eccentric amount of the traditional oil seal is effectively solved, and the sealing effectiveness can be maintained after extreme off-road is ensured.

Inventors

  • LI MINGLI
  • ZHANG WENLI

Assignees

  • 二一二越野车有限公司

Dates

Publication Date
20260505
Application Date
20260119

Claims (10)

  1. 1. The large-follow-up driving half shaft oil seal comprises a half shaft inner oil seal (2) and is characterized in that the half shaft inner oil seal (2) comprises a first elastic support piece (202), an oil-proof lip (204) used for being in sealing fit with a driving half shaft (4) is arranged at one end of the first elastic support piece (202), an elastic component (203) capable of providing pretightening force is arranged in the oil-proof lip (204), an inner framework (205) is arranged in a corner, close to one end of the oil-proof lip (204), of the first elastic support piece (202), and an outer framework (201) is fixedly connected to the other end of the first elastic support piece (202).
  2. 2. The large follow-up driving half shaft oil seal according to claim 1, wherein the longitudinal section of the outer framework (201) is of an inverted L-shaped structure, and the longitudinal section of the elastic support member I (202) is of a Z-shaped structure.
  3. 3. The large follow-up driving half shaft oil seal according to claim 2, wherein the longitudinal section of the elastic support member I (202) between the inner skeleton 205 and the outer skeleton 201 is of a gooseneck structure.
  4. 4. The large follow-up driving half shaft oil seal according to claim 3, wherein the outer framework (201) and the inner framework (205) are made of metal materials, the first elastic supporting piece (202) is made of rubber materials, and the first elastic supporting piece (202) is fixedly connected with the outer framework (201) and the inner framework (205) through a rubber vulcanization process.
  5. 5. The large follow-up driving half shaft oil seal according to any one of claims 1 to 4, further comprising an outer half shaft oil seal (3), wherein the outer half shaft oil seal (3) and the inner half shaft oil seal (2) are coaxially arranged, the outer half shaft oil seal (3) comprises a supporting framework (301), an elastic supporting piece II (302) is fixed on one side, away from the inner half shaft oil seal (2), of the supporting framework (301), and at least two edge lips (303) are arranged on the elastic supporting piece II (302).
  6. 6. The large follow-up driving half shaft oil seal according to claim 5, wherein the longitudinal section of the supporting framework (301) is of an inverted L-shaped structure, the short side of the longitudinal section of the supporting framework (301) comprises a supporting end face (3011), a transition inclined face (3012) is arranged between the supporting end face (3011) and the long side of the longitudinal section of the supporting framework (301), and a sealing end face (3021) is arranged on a second elastic supporting piece (302) outside the transition inclined face (3012).
  7. 7. The hard-pie off-road vehicle front integral steering drive axle comprises an axle housing welding assembly (6) and a driving half shaft (4), wherein a steering yoke (1) is arranged in the axle housing welding assembly (6), and a stepped hole is formed in the steering yoke (1), and the hard-pie off-road vehicle front integral steering drive axle is characterized in that a large-follow-up driving half shaft oil seal is arranged in the stepped hole, the inner half shaft oil seal (2) and the outer half shaft oil seal (3) are in interference fit with the stepped hole, an oil-proof lip (204) is in sealing fit with the driving half shaft (4), a dust cover (5) is arranged on the driving half shaft (4), the dust cover (5) is in interference fit with the driving half shaft (4), and an edge lip (303) is in sealing fit with the dust cover (5).
  8. 8. The hard-pie off-road vehicle front integral steering drive axle of claim 7, wherein a gap of 3-4mm is arranged between the tail end of the long side of the longitudinal section of the supporting framework (301) and the driving half axle (4).
  9. 9. The front-integrated steering drive axle for a hard-pie off-road vehicle according to claim 8, wherein the side lip (303) is provided on the side of the long side end near the longitudinal section of the supporting frame (301).
  10. 10. The front-integrated steering drive axle for a hard-pie off-road vehicle according to claim 9, wherein the end of the side lip (303) is arranged obliquely to the side remote from the drive half shaft (4).

Description

Large-follow-up-amount driving half-shaft oil seal and hard-pie front-integrated steering drive axle for off-road vehicle Technical Field The invention belongs to the technical field of steering drive axles of hard off-road vehicles, and particularly relates to a large-follow-up driving half-shaft oil seal and a hard off-road vehicle front integral steering drive axle. Background The front integral steering drive axle of the hard-style off-road vehicle is a key component for transmitting power, bearing multidirectional force and moment and guaranteeing running performance and passing performance. The design of the driving axle constant velocity universal joint requires that the center of the driving axle constant velocity universal joint is concentric with the center point of a main pin of a wheel steering knuckle, but the driving axle constant velocity universal joint and the wheel steering knuckle are not concentric easily due to insufficient manufacturing precision or later abrasion, and early abrasion and oil leakage of an oil seal of the driving axle are caused. And under off-road working conditions such as rigidity difference of the front axle housing welding assembly and the driving axle shaft, limit leap and the like, the relative deformation of the front axle housing welding assembly and the driving axle shaft far exceeds the allowable eccentric amount of the standard oil seal, so that the lip of the light oil seal is abnormally worn, the heavy oil seal is cracked, oil leakage is caused, and the performance and operation of the whole vehicle are seriously influenced. The utility model discloses a high eccentric semi-axis oil blanket structure of cross country vehicle as in the patent of publication number CN218971822U, including skeleton, main lip, vice lip, rubber support body, the skeleton that sets up is used for axle housing complex assembly, main lip is used for sealing the sealing medium lubricating oil in the axle housing, vice lip is used for the outside dustproof of axle housing, aim at main lip face seal side with overall structure, install in the axle housing assembly, the seal cover is established on the semi-axis, through the rubber support body of connecting S-shaped between skeleton and seal lip, can adapt to the great eccentric swing of semi-axis in the high-speed driving of cross country vehicle, in order to adapt to axle processing oil blanket position and steering node different concentricity, thereby solve the semi-axis oil leak oil seepage problem that the axle arouses because of manufacturing accuracy or axle operation wearing and tearing. In the practical use process, the structure has the following defects that 1, the eccentric compensation is realized only by relying on a single S-shaped rubber support body, the maximum eccentric amount is only 0.5 millimeter, the relative deformation between a front axle housing welding assembly and a driving axle shaft of a hard-group off-road vehicle under the working conditions of extreme leap and the like can reach 2.7 millimeters through the test of the extreme leap working condition of the real vehicle, which is far greater than the maximum eccentric following amount of the oil seal, so that a user still has the situation that the oil seal of the driving axle shaft is damaged and leaks oil after the extreme leap and the off-road is caused, 2, only one auxiliary lip is arranged for dust prevention, a grading protection structure is not designed for refractory impurities such as sediment, broken stone, muddy water and the like in an off-road scene, the dust prevention protection force is insufficient, the impurities easily penetrate the auxiliary lip scratch the main lip, early abrasion leakage is caused, and 3, the vibration resistance stability and the structural strength of the oil seal are insufficient, the frame and the sealing clearance are easily shifted under the severe vibration working conditions, and the lip fitting failure is caused. Disclosure of Invention The invention aims to solve the technical problems of overcoming the defects of the prior art and providing a large-follow-up driving semi-shaft oil seal and a hard-group off-road vehicle front integral steering drive axle, which realizes the elastic deformation stroke of an axle housing welding assembly and a driving semi-shaft of more than 3mm under the working conditions of extreme leap of the hard-group off-road vehicle and the like by matching the semi-shaft inner oil seal and the semi-shaft outer oil seal, effectively solves the problems of lip abrasion and breakage of the traditional oil seal caused by insufficient eccentric amount, and ensures that the sealing effectiveness can be maintained after the extreme off-road vehicle. The large follow-up driving half shaft oil seal comprises a half shaft inner oil seal, the half shaft inner oil seal comprises an elastic support piece I, an oil-proof lip used for being in sealing fit with the driving half shaft is arrange