CN211175376U

CN211175376U - Sealing structure assembly for main input end and output end of intermediate axle

Info

Publication number: CN211175376U
Application number: CN201921841232.4U
Authority: CN
Inventors: 隋景玉; 刘晓东; 宋建平; 郝毅兴; 王君彦; 王桃桃; 刘晓龙; 林海; 王立帅; 张艳娥; 赵有正
Original assignee: Shandong Pengxiang Automobile Co Ltd
Current assignee: Shandong Pengxiang Automobile Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-08-04
Anticipated expiration: 2029-10-30

Abstract

The utility model discloses a middle axle main input reduction end sealing structure assembly, which is characterized in that the middle axle main input reduction end sealing structure assembly comprises an input end oil seal, an adjusting ring, a flange, an input shaft front bearing, a locking nut, a gap bridge box cover and an O-shaped ring, wherein the input end oil seal is provided with an outer diameter fixing surface, a main lip, a first auxiliary lip and a second auxiliary lip; compared with the traditional structure, the number of the oil seals is reduced from 2 to 1, the structure is simple and concise, and the assembly is convenient; an oil return line is cancelled at the main lip of the oil seal, so that the vacuum formed by pumping between the main lip and the auxiliary lip is avoided; due to the fact that the double auxiliary lips are additionally arranged, grease is easy to fill and retain among the 2 auxiliary lips, effective lubrication is provided for an oil seal in the working process, dry friction is avoided, and the service life is prolonged; the design of the oil seal outer diameter half-rubber-coating structure combines the advantages of 2 outer diameter designs of full rubber coating and full framework, and the assembly rebound is avoided while the sealing is ensured; under the background that three-pack mileage of the current heavy truck industry is continuously promoted and oil seal fault claims are continuously increased, a new idea and an effective solution are provided for the arrangement of a middle axle input end sealing structure.

Description

Sealing structure assembly for main input end and output end of intermediate axle

The technical field is as follows:

the utility model relates to a heavily block car axle technical field, specifically say and an intermediate axle owner subtracts input seal structure assembly.

Background art:

as an important part of an axle assembly, the failure of an oil seal product can directly cause the occurrence of oil leakage fault, thereby causing the shutdown of a vehicle. Particularly, with the transformation of after-market service policies in recent years, the three-pack mileage of the oil seal is transformed from the original 8-10 kilometers to the current unlimited mileage within 1 year, and the actual running mileage of the vehicle within 1 year can reach 20-30 kilometers, so that the failure rate of oil seal products is always high. The oil seal is formed by combining rubber and a metal framework, is a vulnerable part, is fragile, delicate and easy, and is very easy to cause damage in each link of production assembly, normal use, after-sale maintenance and the like.

The traditional sealing structure for the input end of the middle axle is generally provided with 2 oil seals or a single oil seal structure equivalent to 2 oil seals, and a main lip which is used for sealing oil and consists of a spring and rubber is provided with an oil return line, so that the oil return line is sucked back to an inner cavity, but the problem of vacuum formation caused by pumping between the main lip and an auxiliary lip is also caused; similarly, the auxiliary lip with the spring for dust prevention is designed to have large radial force and insufficient lubrication, so that the service life is influenced by abrasion easily, and if the interference magnitude is small, the follow-up property is poor and the dust prevention capability is insufficient; the exposed framework design of the outer diameter of the oil seal has poor filling capability on the defects of the shell and is easy to cause oil leakage, and if the outer diameter is designed to be an outer coating structure, the risk of assembly rebound exists; moreover, 2 oil seals are assembled respectively, the assembly process is complex, after-sale markets are reached, and the assembly quality guarantee difficulty is higher.

The utility model has the following contents:

the utility model aims at overcoming the not enough of above-mentioned prior art, and provide a well bridge owner subtracts input seal structure assembly.

The utility model provides a technical scheme is: a middle axle main reducer input end sealing structure assembly is characterized by comprising an input end oil seal, an adjusting ring, a flange, an input shaft front bearing, a locking nut, a gap axle box cover and an O-shaped ring; the front bearing of the input shaft consists of a bearing outer ring and a bearing inner ring, the bearing inner ring can freely rotate on the bearing outer ring, wherein the outer diameter of the bearing outer ring is the same as the inner diameter of a bearing mounting position of the bridge box cover and is fixedly mounted on the bridge box cover, the inner diameter of the bearing inner ring is the same as the outer diameter of the bearing mounting position of the input shaft and is fixedly mounted on the input shaft in a limiting way through a shaft shoulder of the input shaft, and the free rotation of the input shaft on the bridge box cover is realized; the inner diameter of the flange is the same as the outer diameter of the flange mounting position of the input shaft, the flange and the input shaft are fixed in the radial direction through spline fit, the lower end face of the flange is parallel to the upper end face of the bearing inner ring of the front bearing of the input shaft and abuts against the upper end face of the bearing inner ring of the front bearing of the input shaft, and axial limiting is added on the input shaft for the flange; the inner diameter of the locking nut is the same as the outer diameter of the locking position of the input shaft nut, and the locking nut and the input shaft nut are connected through threads and are abutted against and limited and fixed together through the locking nut and the parallel end surface of the flange; the outer diameter of the adjusting ring is the same as the inner diameter of the mounting position of the adjusting ring of the bridge box cover, the adjusting ring and the bridge box cover are connected through threads and are propped against and fixed together by the parallel end surfaces of the adjusting ring and the outer ring of the front bearing of the input shaft through limit, and the adjusting ring can advance and retreat the outer ring of the front bearing of the input shaft through the advance and retreat of the threaded connection, so that the function of adjusting the bearing clearance is realized; the inner diameter, the outer diameter and the section radius of the O-shaped ring are the same as the inner diameter, the outer diameter and the section size of a hollow block clamped by the gap bridge box cover and the adjusting ring, and the O-shaped ring is assembled and fixed between a gap formed by the gap bridge box cover and the adjusting ring, so that the sealing function between the gap bridge box cover and the adjusting ring is realized; the input end oil seal is arranged on the adjusting ring, and the input end oil seal and the flange form friction seal; the flange is connected with the input shaft and freely rotates on the gap box cover through the front bearing of the input shaft, and the sealing between the inner cavity and the outer cavity of the structure assembly is realized due to the existence of the input end oil seal and the O-shaped ring.

Further, the input end oil seal is provided with an outer diameter fixing surface, a main lip, a first auxiliary lip and a second auxiliary lip; the outer diameter of the outer diameter fixing surface of the input end oil seal is the same as the inner diameter of the oil seal mounting position of the adjusting ring, the outer diameter fixing surface is fixedly mounted on the adjusting ring, and the outer diameter fixing surface is of a half-rubber-covered structure, namely a half-rubber and half-metal framework structure; the inner diameters of the main lip, the first auxiliary lip and the second auxiliary lip of the input end oil seal are the same as the outer diameter of the flange oil seal matching surface, the 3 lips are lapped on the oil seal matching surface, and when the flange rotates along with the input shaft, the 3 lips are fixed and always lapped on the oil seal matching surface to form friction seal with the flange; the main lip is not provided with an oil return line, and the first auxiliary lip and the second auxiliary lip are not provided with an oil return line.

The utility model has the advantages that: 1. the structural form of the main lip of the oil seal is unchanged, and the oil return line design is avoided, so that the vacuum formed between the main lip and the auxiliary lip caused by pump suction is avoided; 2. the oil seal is designed into a springless double-auxiliary lip, lubricating grease can be added between the two auxiliary lips in advance for lubrication, the radial force of the lip is small, the abrasion is light, and the service life is long; the problems of dry friction and short service life of the auxiliary lip of the traditional structure are effectively solved; 3. the outer diameter of the oil seal is designed to be half-coated with the rubber, the advantages of 2 outer diameter designs of full-coating with the full-framework are combined, sealing is guaranteed, and assembling rebound is avoided; 4. the single oil seal design of this structure assembly, the structure is brief concise, and the assembly is simple.

Description of the drawings:

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

The specific implementation mode is as follows:

for a better understanding and appreciation of the invention, the following detailed description of the embodiments thereof is given in connection with the accompanying drawings.

As shown in fig. 1, a middle axle main input reduction end sealing structure assembly comprises an input end oil seal 1, an adjusting ring 2, a flange 3, an input shaft 4, an input shaft front bearing 5, a locking nut 6, a gap axle box cover 7 and an O-ring 8, wherein an outer diameter fixing surface 11, a main lip 12, a first auxiliary lip 13 and a second auxiliary lip 14 are processed on the input end oil seal 1; the input shaft front bearing 5 consists of a bearing outer ring and a bearing inner ring, the bearing inner ring can freely rotate on the bearing outer ring, the outer diameter of the bearing outer ring is the same as the inner diameter of a bearing installation position of the gap bridge box cover 7 and is fixedly installed on the gap bridge box cover 7, the inner diameter of the bearing inner ring is the same as the outer diameter of a bearing installation position of the input shaft 4 and is fixedly installed on the input shaft 4 in a limiting way through a shaft shoulder of the input shaft 4, and the free rotation of the input shaft 4 on the gap bridge box cover 7 is realized; the inner diameter of the flange 3 is the same as the outer diameter of the flange mounting position of the input shaft 4, the flange 3 and the input shaft 4 are fixed in the radial direction through spline fit, the lower end face of the flange 3 is parallel to the upper end face of the bearing inner ring of the input shaft front bearing 5, the flange 3 and the input shaft front bearing are abutted together, and axial limiting is added on the input shaft 4 for the flange 3; the inner diameter of the locking nut 6 is the same as the outer diameter of the nut locking position of the input shaft 4, and the locking nut 6 and the nut locking position are connected through threads and are abutted against and limited and fixed together through the locking nut 6 and the parallel end surface of the flange 3; the outer diameter of the adjusting ring 2 is the same as the inner diameter of the adjusting ring mounting position of the gap bridge box cover 7, the adjusting ring 2 and the gap bridge box cover 7 are connected through threads, the adjusting ring 2 and the parallel end surface of the bearing outer ring of the input shaft front bearing 5 are abutted and limited and fixed together, and the adjusting ring 2 can advance and retreat the bearing outer ring of the input shaft front bearing 5 through the advance and retreat of threaded connection, so that the bearing play adjusting function is realized; the inner diameter, the outer diameter and the section radius of the O-shaped ring 8 are the same as the inner diameter, the outer diameter and the section size of a hollow block clamped by the gap bridge box cover 7 and the adjusting ring 2, and the O-shaped ring 8 is assembled and fixed between a gap formed by the gap bridge box cover 7 and the adjusting ring 2, so that the sealing function between the gap bridge box cover 7 and the adjusting ring 2 is realized; the outer diameter of an outer diameter fixing surface 11 of an input end oil seal 1 is the same as the inner diameter of an oil seal mounting position of an adjusting ring 2, the outer diameter fixing surface 11 is fixedly mounted on the adjusting ring 2, and the outer diameter fixing surface 11 is processed into a half-rubber-covered structure (half rubber and half metal framework); the inner diameters of a main lip 12, a first auxiliary lip 13 and a second auxiliary lip 14 of an input end oil seal 1 are the same as the outer diameter of an oil seal matching surface of a flange 3, the 3 lips are lapped on the oil seal matching surface, when the flange 3 rotates along with an input shaft 4, the 3 lips are not moved and are always lapped on the oil seal matching surface to form friction seal with the flange 3, the main lip 12 does not have an oil return line, and the first auxiliary lip 13 and the second auxiliary lip 14 do not have an oil return line; therefore, the flange 3 with the input shaft 4 can freely rotate on the gap bridge box cover 7 through the input shaft front bearing 5, and the sealing function between the inner cavity and the outer cavity of the structural assembly is realized through the existence of the input end oil seal 1 and the O-shaped ring 8.

The utility model discloses a main input end seal structure assembly that subtracts of intermediate axle, during operation, use the child assembly of pressure to impress input oil blanket 1 at first on the hole of adjusting ring 2, make the two keep a specific position relation in the axial, the external diameter stationary plane 11 of input oil blanket 1 just forms sealed cooperation with the internal diameter of adjusting ring 2, again with O type circle 8 assembly cover to the external diameter recess of adjusting ring 2 in, just so constitute an adjustment clitellum oil blanket and O type circle assembly, this assembly is kept somewhere for use; after an input shaft front bearing 5 is assembled to a bearing installation position of an input shaft 4, the input shaft assembly is installed in an inner cavity of a middle axle main reducer formed by assembling a gap axle box cover 7, a reducer shell and the like together, an element in the inner cavity limits and fixes the input shaft axially, and at the moment, the outer diameter of a bearing outer ring of the input shaft front bearing 5 is just matched with the inner diameter of a bearing position of the gap axle box cover 7; at this moment, a prepared adjusting ring assembly is installed on a gap bridge box cover 7 through threaded connection, the lower end face of an adjusting ring 2 is in fit contact with the end face of a bearing outer ring of an input shaft front bearing 5, the adjustment of the bearing clearance of the input shaft front bearing 5 and a main reduction cavity inner input shaft rear bearing can be realized by adjusting the axial position of the adjusting ring 2, the ideal working state of two tapered roller bearings is achieved, and at the moment, an O-shaped ring 8 is extruded between grooves formed by the gap bridge box cover 7 and the adjusting ring 2 to play a sealing role; then, the flange 3 is connected and arranged on the input shaft 4 through a spline, axial limiting and fixing are carried out through a bearing inner ring of the input shaft front bearing 5, and the oil seal matching surface of the flange 3 just forms a matching relation with a main lip 12, a first auxiliary lip 13 and a second auxiliary lip 14 of the input end oil seal 1, so that the sealing effect is played; the locking nut 6 is installed on the input shaft 4 through threaded connection, the lower end face is attached to the flange 3, and finally the nut is locked, so that the assembly of the whole assembly is completed; when the input shaft assembly runs, the flange 3 drives the whole input shaft assembly to rotate to transmit torque, a certain amount of lubricating oil is filled in a main reducing cavity due to the requirements of working lubrication of bearings, gears and the like, and just because the outer diameter fixing surface 11 and the main lip 12 of the input end oil seal 1 are respectively in a sealing relation with the adjusting ring 2 and the flange 3 and the sealing action formed between the bridge box cover 7 and the adjusting ring 2 by the O-shaped ring 8, one drop of the lubricating oil in the main reducing cavity cannot leak; in addition, due to the existence of the first auxiliary lip 13 and the second auxiliary lip 14 of the input end oil seal 1, a small amount of lubricating grease is filled between the two lips in advance during assembly, so that in the long-time rotation process of the flange, although the two lips are always in friction sealing with the flange 3, abnormal heating expansion deformation is always avoided, and the first auxiliary lip 13 can play a role in dust sealing stably and reliably; therefore, the simple and concise sealing structure assembly for the main input end and the output end of the middle axle fully plays the oil and dust sealing functions.

Claims

1. A middle axle main reducer input end sealing structure assembly is characterized by comprising an input end oil seal (1), an adjusting ring (2), a flange (3), an input shaft (4), an input shaft front bearing (5), a locking nut (6), a gap axle box cover (7) and an O-shaped ring (8); the front bearing (5) of the input shaft consists of a bearing outer ring and a bearing inner ring, the bearing inner ring can freely rotate on the bearing outer ring, wherein the outer diameter of the bearing outer ring is the same as the inner diameter of a bearing installation position of the gap bridge box cover (7), the bearing outer ring is installed and fixed on the gap bridge box cover (7), the inner diameter of the bearing inner ring is the same as the outer diameter of the bearing installation position of the input shaft (4), and the bearing inner ring is installed and fixed on the input shaft (4) in a limiting way through a shaft shoulder of the input shaft (4), so that the free rotation of the input shaft (4) on the gap bridge box cover (7) is realized; the inner diameter of the flange (3) is the same as the outer diameter of the flange mounting position of the input shaft (4), the flange and the input shaft are fixed in the radial direction through spline fit, the lower end face of the flange (3) is parallel to the upper end face of the bearing inner ring of the input shaft front bearing (5), the flange and the input shaft front bearing are abutted together, and axial limiting is added on the input shaft (4) for the flange (3); the inner diameter of the locking nut (6) is the same as the outer diameter of the nut locking position of the input shaft (4), and the locking nut (6) and the nut locking position are connected through threads and are abutted against and limited and fixed together with the parallel end surfaces of the flange (3) through the locking nut (6); the outer diameter of the adjusting ring (2) is the same as the inner diameter of the adjusting ring mounting position of the gap bridge box cover (7), the adjusting ring and the gap bridge box cover are connected through threads, the adjusting ring (2) and the parallel end face of the bearing outer ring of the input shaft front bearing (5) are abutted and fixed together in a limiting manner, and the adjusting ring (2) can advance and retreat the bearing outer ring of the input shaft front bearing (5) through the advance and retreat of threaded connection, so that the bearing clearance adjusting function is realized; the inner diameter, the outer diameter and the section radius of the O-shaped ring (8) are the same as the inner diameter, the outer diameter and the section size of a neutral gear clamped between the gap box cover (7) and the adjusting ring (2), and the O-shaped ring (8) is assembled and fixed between gaps formed by the gap box cover and the adjusting ring, so that the sealing function between the gap box cover (7) and the adjusting ring (2) is realized; the input end oil seal (1) is arranged on the adjusting ring (2), and the input end oil seal (1) and the flange (3) form friction seal; the flange (3) is connected with the input shaft (4) and freely rotates on the gap bridge box cover (7) through the input shaft front bearing (5), and the sealing between the inner cavity and the outer cavity of the structural assembly is realized due to the existence of the input end oil seal (1) and the O-shaped ring (8).

2. The middle axle main input reduction end sealing structure assembly according to claim 1, wherein the input end oil seal (1) is provided with an outer diameter fixing surface (11), a main lip (12), a first auxiliary lip (13) and a second auxiliary lip (14); the outer diameter of an outer diameter fixing surface (11) of the input end oil seal (1) is the same as the inner diameter of an oil seal mounting position of the adjusting ring (2), the outer diameter fixing surface (11) is fixedly mounted on the adjusting ring (2), and the outer diameter fixing surface (11) is of a half-rubber-covered structure, namely a half-rubber and half-metal framework structure; the inner diameters of a main lip (12), a first auxiliary lip (13) and a second auxiliary lip (14) of the input end oil seal (1) are the same as the outer diameter of an oil seal matching surface of the flange (3), the 3 lips are lapped on the oil seal matching surface, and when the flange (3) rotates along with the input shaft (4), the 3 lips are not moved and are always lapped on the oil seal matching surface to form friction seal with the flange (3); the main lip (12) is not provided with an oil return line, and the first auxiliary lip (13) and the second auxiliary lip (14) are not provided with an oil return line.