CN215521629U

CN215521629U - Double-oil-cavity lubricating high-sealing hub unit

Info

Publication number: CN215521629U
Application number: CN202122182508.6U
Authority: CN
Inventors: 萧月军
Original assignee: Zhejiang Hongning Bearing Technology Co ltd
Current assignee: Zhejiang Hongning Bearing Technology Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-01-14
Anticipated expiration: 2031-09-09

Abstract

The utility model relates to the technical field of automobile bearings. The double-oil-cavity lubricating high-sealing hub unit comprises a flange plate consisting of a disc body and a disc shaft, and a bearing assembly; the bearing assembly comprises an inner ring, an outer ring and a cylindrical roller, the inner ring is sleeved on the disc shaft, a rolling groove is formed between the inner ring and the outer ring, and the cylindrical roller is arranged in the rolling groove through a retainer; annular inner lubrication grooves and annular outer lubrication grooves are respectively arranged on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring and close to the two ends of the cylindrical roller, the inner lubrication grooves and the outer lubrication grooves are opposite in position, and the inner lubrication grooves and the outer lubrication grooves at the two ends of the cylindrical roller are corresponding to form two lubrication cavities. The utility model can greatly improve the space between the inner ring and the outer ring for accommodating the lubricating grease, so that sufficient lubricating grease is arranged between the inner ring and the outer ring, the frequency of adding the lubricating grease can be reduced, and the good and smooth lubrication can be maintained for a long time.

Description

Double-oil-cavity lubricating high-sealing hub unit

Technical Field

The utility model relates to the technical field of automobile bearings, in particular to a double-oil-cavity lubricating high-sealing hub unit.

Background

The hub bearing is applied to the end part of an automobile shaft, is used for providing support for the hub and providing accurate guide for the rotation of the hub, bears axial load and radial load, and is an important component part for the load and rotation of the automobile. Through the development of many years, the automobile wheel hub bearing has formed multiple categories such as integrated form, combination formula, individual layer formula, bilayer formula, individual layer formula wheel hub bearing has simple structure, cost low grade advantage, be fit for using on light type small load vehicle, individual layer formula wheel hub bearing generally includes inner circle, outer lane, set up the roller through the holder between the two, the inner circle direct mount is on the dish axle of ring flange, the outer lane is connected with foundations such as bogie, the dish axle and the motor drive system of ring flange are connected, the disk body is connected with wheel hub, and then realize the transmission of power.

In recent years, with the rapid development of electric automobiles, the electric automobiles are driven by motors, so that a plurality of complex large-scale components such as engines, gearboxes, transmission systems and the like are omitted, and more light-weight and small-size automobiles are provided. In order to adapt to the industry development changes, the corresponding hub bearing for the electric automobile gradually becomes the mainstream of the industry development. However, the existing hub bearing has the following problems: 1. when the inner ring is installed on the disc shaft, the stability of the inner ring is still to be improved, excessive stress is dispersed to the corresponding connecting bolt, so that the shearing force of the bolt is excessive, and the bolt has certain deformation risk when a motor with large torque is used for transmission; 2. the receiving space of the grease between the inner ring and the outer ring is small, and along with the prolonging of the service life and the consumption of the grease, the smoothness of the rotation between the inner ring and the outer ring is reduced, so that the maintenance is frequent. 3. The inner ring and the outer ring are generally sealed through the three-lip type sealing assembly, however, the traditional three-lip type sealing assembly is single contact type sealing, and in the long-term use process, the abrasion to the sealing lip is large, and the sealing service life is influenced. 4. Electric automobile all pursues lightweight, integrates, and current brake disc is installed on the dish neck of ring flange usually, has led to occupying great installation space, is unfavorable for integrating.

Disclosure of Invention

The utility model aims to provide a double-oil-cavity lubricating high-sealing hub unit with sufficient lubrication.

In order to achieve the purpose of the utility model, the technical scheme adopted by the utility model is as follows: a double-oil-cavity lubricating high-sealing hub unit comprises a flange plate consisting of a plate body and a plate shaft, and a bearing assembly; the bearing assembly comprises an inner ring, an outer ring and a cylindrical roller, the inner ring is sleeved on the disc shaft, a rolling groove is formed between the inner ring and the outer ring, and the cylindrical roller is arranged in the rolling groove through a retainer;

annular inner lubrication grooves and annular outer lubrication grooves are respectively arranged on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring and close to the two ends of the cylindrical roller, the inner lubrication grooves and the outer lubrication grooves are opposite in position, and the inner lubrication grooves and the outer lubrication grooves at the two ends of the cylindrical roller are corresponding to form two lubrication cavities.

Preferably, the inner lubrication groove and the outer lubrication groove are both U-shaped grooves.

Preferably, the surface of the circumferential surface of the cylindrical roller, which is opposite to the lubrication cavity, is provided with a grease extracting pattern.

Preferably, a layer of annular brush pad is laid at the bottom of the inner lubricating groove, and a plurality of fiber bristles are arranged on the surface, facing the cylindrical roller, of the brush pad.

Preferably, the outer ring is provided with a communicating hole inside, the outer lubrication grooves at the two ends of the cylindrical roller are communicated through the communicating hole, the outer ring is further provided with a lubricating grease replenishing hole, and the lubricating grease replenishing hole is communicated with the communicating hole.

The beneficial effects of the utility model are concentrated and expressed as follows: the space for accommodating lubricating grease between the inner ring and the outer ring can be greatly improved, sufficient lubricating grease is arranged between the inner ring and the outer ring, the frequency of adding the lubricating grease can be reduced, and good and smooth lubrication can be maintained for a long time. Particularly, the inner lubricating groove and the outer lubricating groove are formed in the positions, close to the two ends, of the cylindrical roller, the inner lubricating groove and the outer lubricating groove jointly form a lubricating cavity, the lubricating cavity provides a large space for filling lubricating grease, and sufficient lubricating grease is convenient to fill.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is a left side view of the inner race of FIG. 1;

fig. 5 is a right side view of the inner race of fig. 1.

Detailed Description

As shown in fig. 1 to 5, a double-cavity lubrication high-sealing hub unit is similar to a conventional hub bearing, and the present invention also includes a flange formed of a disc body 1 and a disc shaft 2, and a bearing assembly. The bearing assembly comprises an inner ring 3, an outer ring 4 and a cylindrical roller 5, wherein the inner ring 3 is sleeved on the disc shaft 2, a rolling groove is formed between the inner ring 3 and the outer ring 4, and the cylindrical roller 5 is arranged in the rolling groove through a retainer.

A first difference of the present invention from the point of view of the bearing assembly is that the sealing manner between the outer ring 3 and the inner ring 4 of the bearing assembly is different from that of the conventional hub bearing, and in conjunction with the sealing assemblies 6 arranged in the gaps at the two ends of the outer ring 4 and the inner ring 3 shown in fig. 1 and 3, the sealing assemblies 6 comprise a first sealing cover 7 and a second sealing cover 8, and the first sealing cover 7 and the second sealing cover 8 are generally metal covers. The cross sections of the first sealing cover 7 and the second sealing cover 8 are L-shaped, the first sealing cover 7 and the second sealing cover 8 are fixedly arranged on the inner ring 3 and the outer ring 4 respectively, and a square sealing cavity is formed between the first sealing cover 7 and the second sealing cover 8. That is, two seal covers are provided one on the outer ring 4 and one on the inner ring 3, as shown in fig. 3, the first seal cover 7 being fixedly provided on the inner ring 3 and the second seal cover 8 being fixedly provided on the outer ring 4. The two are enclosed, and the L-shape of each sealing cover forms two edges of the sealing cavity.

The first sealing cover 7 and the second sealing cover 8 are respectively provided with three vertical annular sealing lips 9, generally, the sealing lips 9 are nitrile rubber lips, namely, the sealing lips are made of nitrile rubber, and the sealing device has various excellent characteristics of high temperature resistance, weather resistance and the like. The sealing lips 9 of the first sealing cover 7 and the second sealing cover 8 are staggered and distributed in pairs, as shown in fig. 3, the sealing lips 9 are provided in three pairs. The overhanging end of the sealing lip 9 is provided with a large-size expansion contact part 10, a cavity 11 is arranged in the expansion contact part 10, and the cavity 11 is filled with water-absorbing expansion resin. After the water-absorbing expansion resin expands, the expansion contact part 10 can be enlarged, the adjacent expansion contact parts 10 are changed from micro clearance fit to contact fit, and the surface of the expansion contact part 10 is provided with micropores communicated with the cavity 11. The water-swellable resin absorbs water vapor entering the seal assembly through the micropores. The shape of the expansion contact part 10 according to the present invention is more, such as a semicircle, a triangle, a trapezoid, etc., as shown in fig. 3, the cross section of the expansion contact part 10 is triangular, and the expansion contact part 10 of each pair of sealing lips 9 faces oppositely.

In the use process of the sealing assembly, in general, a non-contact type seal is formed by directly passing through the circuitous sealing labyrinth formed between the sealing lips 9, and in this case, the sealing lips 9 are not in direct contact, so that the sealing assembly has no abrasion and has better wear resistance. Under the condition that the non-contact sealing tightness is insufficient, a small amount of water vapor can enter the sealing labyrinth, at the moment, the water vapor penetrates through micropores in the expansion contact parts 10 to enter the cavity 11 and is absorbed by the water-absorbing expansion resin, and after the water-absorbing expansion resin expands, the expansion contact parts 10 of the adjacent sealing lips 9 are in contact with each other to form contact sealing. The utility model combines the contact sealing and the non-contact sealing, the overall sealing performance is excellent, and simultaneously, the wear is small and the service life is longer because the non-contact sealing is mainly adopted in the early stage of use. In order to make the sealing performance of the sealing labyrinth better and form a more circuitous channel, the three sealing lips 9 on the first sealing cover 7 are gradually lengthened along the direction away from the outside, and the three sealing lips 9 on the second sealing cover 8 are gradually shortened along the direction away from the outside.

Meanwhile, the second difference of the present invention compared with the conventional hub bearing is that, as shown in fig. 1 and 2, the positions on the outer circumferential surface of the inner ring 3 and the inner circumferential surface of the outer ring 4 near the two ends of the cylindrical rollers 5 are respectively provided with an annular inner lubrication groove 12 and an annular outer lubrication groove 13, and as shown in the figure, because only one row of cylindrical rollers 5 is provided, the inner lubrication groove 12 and the outer lubrication groove 13 are respectively provided with two. If two or more rows of cylindrical rollers 5 are used, lubrication grooves should be provided at positions corresponding to the rows of cylindrical rollers 5. The inner lubrication grooves 12 and the outer lubrication grooves 13 are opposite in position, and the inner lubrication grooves 12 and the outer lubrication grooves 13 at the two ends of the cylindrical roller 5 correspondingly form two lubrication cavities. The inner lubrication groove 12 and the outer lubrication groove 13 may be U-shaped grooves, or may have a triangular or semicircular cross section.

Because the inner lubricating groove 12 and the outer lubricating groove 13 are arranged at the positions of the cylindrical roller 5 close to the two ends, the inner lubricating groove 12 and the outer lubricating groove 13 jointly form a lubricating cavity, the lubricating cavity provides a larger space for filling lubricating grease, and is convenient for filling sufficient lubricating grease, and the lubricating grease can be continuously adhered to the surface of the cylindrical roller 5 from the lubricating cavity in the rotating process of the cylindrical roller 5 and can be transferred on the whole surface of the cylindrical roller 5 along with the rotation of the cylindrical roller 5, so that sufficient lubrication is provided for the cylindrical roller 5. In addition, in order to improve the grease extracting capability of the cylindrical roller 5 from the lubrication cavity, grease extracting patterns 14 are arranged on the surface of the circumferential surface of the cylindrical roller 5 opposite to the lubrication cavity. The grease-taking grains 14 are micro-convex arc grains arranged on the surface of the cylindrical roller 5.

In order to prevent the cylindrical roller 5 from being excessively adhered with grease, an annular brush pad 15 is laid on the bottom of the inner lubrication groove 12, and a plurality of fiber bristles are arranged on the surface of the brush pad 15 facing the cylindrical roller 5. The fiber fuzz of the brush pad 15 is not directly contacted with the cylindrical roller 5, a certain micro gap is reserved, and the fiber fuzz can scrape off the lubricating grease on the fiber fuzz along with the rotation of the cylindrical roller 5. In order to facilitate the addition of lubricating grease into the bearing assembly in the later maintenance process, the outer ring 4 is internally provided with a communicating hole 16, the outer lubricating grooves 13 at two ends of the cylindrical roller 5 are communicated through the communicating hole 16, the outer ring 4 is also provided with a lubricating grease replenishing hole 17, the lubricating grease replenishing hole 17 is communicated with the communicating hole 16, and the lubricating grease replenishing hole 17 can be provided with a hole cover.

The first great difference of the present invention is that, from the viewpoint of the way of assembling the hub bearing as a whole: referring to fig. 1, 4 and 5, a first connecting ring 18 is disposed on a circumferential surface of one end of the inner ring 3 close to the flange plate body 1, and a second connecting ring 19 is disposed on a circumferential surface of one end of the outer ring 4 far from the flange plate body 1. The first connecting ring 18 and the second connecting ring 19 are disc-shaped. The first connecting ring 18 is provided with a plurality of strip-shaped stabilizing grooves 20 which extend along the radial direction of the first connecting ring 18 on the disc body 1, a plurality of stabilizing keys 21 are arranged on the disc body 1 of the flange plate corresponding to the stabilizing grooves 20, and the stabilizing keys 21 are clamped in the stabilizing grooves 20. The key top of the stabilizing key 21 is provided with a first stabilizing bolt 22 perpendicular to the stabilizing key 21, a first stabilizing hole 23 is formed in the position, corresponding to the first stabilizing bolt 22, of the stabilizing groove 20, and the first stabilizing bolt 22 penetrates through the first stabilizing hole 23 to lock the outer ring 4 and the disc body 1.

The inner ring 3 of the utility model is sleeved on the disc shaft 2 from the end part of the disc shaft 2 and is locked by the first stabilizing bolt 22. Because the stabilizing groove 20 and the stabilizing key 21 are arranged, the axial positioning mainly depends on the pulling of the first stabilizing bolt 22, the first stabilizing bolt 22 mainly bears the pulling force, and the circumferential positioning depends on the stabilizing groove 20 and the stabilizing key 21, the shearing force applied to the first stabilizing bolt 22 can be effectively reduced, so that the connection between the inner ring 3 and the flange plate is very stable. At the same time, during installation, it is well positioned due to the presence of the stabilizing slot 20 and the stabilizing key 21.

In order to further improve stability, when the stabilization key 21 and the stabilization groove 20 are connected, a second stabilization hole 24 is further included, and the second stabilization hole 24 penetrates both sidewalls of the stabilization key 21 and the stabilization groove 20 in a transverse direction. A second stabilizing bolt 25 is fitted into the second stabilizing hole 24, and the stabilizing key 21 and the stabilizing groove 20 are locked by the second stabilizing bolt 25. Generally, the second stabilizing hole 24 is located near the trailing end of the stabilizing key 21, and the first stabilizing bolt 22 is located near the root end of the stabilizing key 21. In addition, one end, namely the right end, of the inner ring 3 far away from the first connecting ring 18 is also in key combination with the disc shaft 2, as shown in fig. 1, the outer side wall of one end, far away from the disc body 1, of the disc shaft 2 of the flange plate is uniformly provided with a plurality of connecting grooves, and the connecting grooves extend along the length direction of the disc shaft 2. And a plurality of connecting keys 26 matched with the connecting grooves are arranged on the inner side wall of one end of the inner ring 3, which is far away from the flange plate body 1. The structure of the connecting key 26 is shown in fig. 4 and 5.

In the integral assembly of the hub bearing, the second great difference of the utility model is that the brake disc 30 is directly assembled on the disc body 1 of the flange plate, as shown in fig. 1, a connecting screw 27 is arranged on one side of the disc body 1 of the flange plate, which is far away from the disc shaft 2, and the edge of the disc body 1 is bent towards one side of the disc shaft 2 to form the mounting ring 28. The outer circumferential surface of the mounting ring 28 is provided with a ring-shaped mounting groove 29. The brake disc 30 is matched with the width of the installation groove 29 in thickness, and the inner edge of the brake disc 30 is clamped in the installation groove 29. The mounting hole is along transversely running through the both sides wall of brake disc 30 and mounting groove 29, and the mounting hole is annular evenly distributed along the circumference of mounting groove 29, and the adaptation has mounting bolt 31 in the mounting hole, brake disc 30 passes through mounting bolt 31 and locks in mounting groove 29.

The brake disc 30 is arranged in the mounting groove 29 at the edge of the flange plate, the position on the disc body 1 is fully utilized, favorable conditions are provided for mounting and integrating other parts at the automobile hub part, and meanwhile, the brake disc is fixed by adopting a plurality of mounting bolts 31, so that the connection strength is sufficient. In order to further improve the convenience of installation, one side of the installation ring 28 is provided with a fastening ring 32 with a Z-shaped cross section, one corner section of the Z shape of the fastening ring 32 is attached to the installation ring 28 and the disc body 1 and locked by a fastening bolt 33, and one side wall of the installation groove 29 is formed by one section of the Z shape of the fastening ring 32. The brake disc selected by the utility model is a double-layer brake disc 30. The brake disc 30 is provided with a plurality of vent holes.

Claims

1. A double-oil-cavity lubricating high-sealing hub unit comprises a flange plate consisting of a disc body (1) and a disc shaft (2), and a bearing assembly; the bearing assembly comprises an inner ring (3), an outer ring (4) and a cylindrical roller (5), the inner ring (3) is sleeved on the disc shaft (2), a rolling groove is formed between the inner ring (3) and the outer ring (4), and the cylindrical roller (5) is installed in the rolling groove through a retainer;

the method is characterized in that: annular inner lubrication grooves (12) and annular outer lubrication grooves (13) are respectively formed in the positions, close to the two ends of the cylindrical roller (5), on the outer peripheral surface of the inner ring (3) and the inner peripheral surface of the outer ring (4), the positions of the inner lubrication grooves (12) and the positions of the outer lubrication grooves (13) are opposite, and the inner lubrication grooves (12) and the outer lubrication grooves (13) located at the two ends of the cylindrical roller (5) correspondingly form two lubrication cavities.

2. The dual oil chamber lubricating high seal hub unit of claim 1, wherein: the inner lubricating groove (12) and the outer lubricating groove (13) are both U-shaped grooves.

3. The dual oil chamber lubricating high seal hub unit of claim 2, wherein: and the circumferential surface of the cylindrical roller (5) opposite to the lubricating cavity is provided with a grease taking line (14).

4. The dual oil chamber lubricating high seal hub unit of claim 3, wherein: a layer of annular brush pad (15) is laid at the bottom of the inner lubricating groove (12), and a plurality of fiber fuzz are arranged on one surface, facing the cylindrical roller (5), of the brush pad (15).

5. The dual oil chamber lubricating high seal hub unit of claim 4, wherein: the lubricating device is characterized in that a communicating hole (16) is formed in the outer ring (4), the outer lubricating grooves (13) at two ends of the cylindrical roller (5) are communicated through the communicating hole (16), a lubricating grease replenishing hole (17) is further formed in the outer ring (4), and the lubricating grease replenishing hole (17) is communicated with the communicating hole (16).