CN108343674B

CN108343674B - Hub bearing

Info

Publication number: CN108343674B
Application number: CN201710059974.0A
Authority: CN
Inventors: 张永康; 彭祥多
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-01-24
Filing date: 2017-01-24
Publication date: 2021-10-22
Anticipated expiration: 2037-01-24
Also published as: CN108343674A

Abstract

A hub bearing comprising: an inner ring; an outer ring surrounding the inner ring; the first framework and the second framework are positioned in a radial gap between the inner ring and the outer ring, are respectively fixed on the inner ring and the outer ring, and jointly define a gap channel, and the gap channel is provided with an opening facing the inside of the bearing and an opening facing the outside of the bearing; a seal gap extending in a first direction and surrounding the inner race. The wheel hub bearing of the technical scheme can reduce the risk that external pollutants invade the interior of the bearing.

Description

Hub bearing

Technical Field

The invention relates to the technical field of bearings, in particular to a hub bearing.

Background

The wheel hub motor technology is also called as the wheel built-in motor technology, and the most important characteristic is that the power, transmission and braking devices are integrated into the wheel hub, so that the mechanical part of the electric vehicle is greatly simplified.

The hub bearing is an important part in the hub motor technology and comprises: an inner ring; an outer ring surrounding the inner ring; and the two L-shaped frameworks positioned in the radial gap between the inner ring and the outer ring are respectively fixed on the inner ring and the outer ring. The inner ring is connected to the wheel, and the outer ring is fixed in the frame, and the inner ring can rotate relative to the outer ring.

Typically, in two L-shaped armatures, each L-shaped armature comprises one radial extension and one axial extension surrounding the inner ring. The two L-shaped frameworks are respectively fixed on the inner ring and the outer ring through respective axial extension parts, and an accommodating gap is defined by the two axial extension parts and the radial extension parts of the two L-shaped frameworks. And along the radial direction of the bearing, the respective radial extension parts of the two frameworks point to the axial extension part of the other framework respectively to form an opening of the accommodating gap facing the inside of the bearing and an opening facing the outside of the bearing. Wherein bearing outer refers to the environment outside the hub bearing and bearing inner refers to the environment inside the hub bearing defined by the inner race and the outer race.

Be equipped with the sealing washer in accommodation gap, the sealing washer is fixed in one of them skeleton and contact seal in another skeleton, is used for blockking up accommodation gap with isolated opening towards the inside of bearing and the outside opening of orientation bearing, prevents inside external pollutant gets into the bearing. However, the opening towards the outside of the bearing is short along the axial path of the bearing, increasing the risk of external contaminants intruding into the receiving gap and thus into the interior of the bearing.

Disclosure of Invention

The invention solves the problem that the sealing effect of the existing hub bearing is poor.

To solve the above problems, the present invention provides a hub bearing. Wherein, wheel hub bearing includes: an inner ring; an outer ring surrounding the inner ring; the first framework and the second framework are positioned in a radial gap between the inner ring and the outer ring, are respectively fixed on the inner ring and the outer ring, and jointly define a gap channel, and the gap channel is provided with an opening facing the inside of the bearing and an opening facing the outside of the bearing; the clearance channel includes: a seal gap extending in a first direction and surrounding the inner race.

Optionally, in the first and second skeletons, each skeleton comprises: a skeletal unit comprising: the two extending parts surround the inner ring and are arranged along the radial direction of the bearing; the connecting part is used for connecting the same ends of the two extending parts along the axial direction of the bearing; the connecting parts of the first framework and the second framework are respectively close to the inside and the outside of the bearing, and the extending parts of the first framework and the extending parts of the second framework are alternately arranged and overlapped along the radial direction of the bearing, so that the gap channel is defined; wherein the extension part of the first framework and the extension part of the second framework which are adjacent to each other and can realize the sealing function define the sealing gap.

Optionally, the seal gap comprises a first seal gap and a second seal gap arranged radially along the bearing.

Optionally, the first sealing gap is folded back after extending to the end along the first direction, and continues to extend along a direction opposite to the first direction, so as to form the second sealing gap.

Optionally, the clearance channel further comprises: the accommodating gap is defined by two adjacent extending parts; the hub bearing further includes: a seal member received in the receiving gap for blocking the gap passage.

Optionally, the clearance channel further comprises: a receiving gap; the hub bearing further includes: a seal located within the receiving gap for blocking the gap passage.

Optionally, the seal is a gasket.

Optionally, the seal is attached to one of the first and second bobbins, the other of the first and second bobbins having two surfaces facing the seal axially and radially of the bearing; the seal includes: and the first sealing lip and the second sealing lip are respectively in contact sealing with the two surfaces.

Optionally, the receiving gap includes at least two arranged along the radial direction of the bearing, and the sealing gap is located between two adjacent receiving gaps.

Optionally, the seal gap includes at least two seal gaps arranged along the radial direction of the bearing, and the accommodating gap is located between two adjacent seal gaps.

Optionally, the receiving gap is a gap portion of the gap channel closest to the inner ring or the outer ring.

Optionally, the first direction is a bearing axial direction or a bearing radial direction.

Compared with the prior art, the technical scheme of the invention has the following advantages:

the sealing gap can increase the difficulty of external pollutants diffusing to the inside of the bearing, and reduce the risk of the external pollutants invading the inside of the bearing, so that the hub bearing has better sealing effect.

Drawings

FIG. 1 is a cross-sectional view of a hub bearing of a first embodiment of the present invention, the cross-section passing through a central axis, and the cross-sectional view showing only the structure of one axial end of the hub bearing;

FIG. 2 is a cross-sectional view of a hub bearing of a second embodiment of the present invention, the cross-section passing through the central axis, and the cross-sectional view showing only the structure of one axial end of the hub bearing;

fig. 3 is a sectional view of a hub bearing according to a third embodiment of the present invention, the section passing through the central axis, and the sectional view showing only the structure of one axial end of the hub bearing.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

First embodiment

Referring to fig. 1, a hub bearing includes: an inner ring 1; an outer ring 2 surrounding the inner ring 1; and a first skeleton 3 and a second skeleton 4 which are positioned in a radial gap between the inner ring 1 and the outer ring 2, are respectively fixed on the inner ring 1 and the outer ring 2, and jointly define a gap channel 1a, and the gap channel 1a is provided with an opening 1b facing the inside of the bearing and an opening 1c facing the outside of the bearing.

Wherein the clearance channel 1a includes: the seal gap 1aa, which extends in the first direction a, which is the axial direction of the bearing, and surrounds the inner ring 1, is adapted to block contaminants from the outside of the bearing from intruding into the inside of the bearing. The size of the sealing gap 1aa along the axial direction of the bearing is far larger than the distance between the sealing gap 1aa and the bearing, and the sealing gap 1aa is a long and narrow gap which can at least prevent large-size pollutants from invading the interior of the bearing. Meanwhile, the sealing gap 1aa can increase the difficulty of external pollutants diffusing to the inside of the bearing, and reduce the risk of the external pollutants invading the inside of the bearing.

In the first skeleton 3 and the second skeleton 4, each skeleton includes a skeleton unit. The skeleton unit includes: the two extending parts surround the inner ring 1 and are arranged along the radial direction of the bearing; and the connecting part is connected with the same ends of the two extending parts along the axial direction of the bearing. For example, the first frame 3 includes a frame unit, the extension portion is the first extension portion 31 and the connection portion is the first connection portion 32, and the second frame 4 includes a frame unit, the extension portion is the second extension portion 41 and the connection portion is the second connection portion 42. Therefore, the cross sections of the first frame 3 and the second frame 4 are U-shaped, and the first frame 3 and the second frame 4 are both approximately U-shaped frames.

The connecting portion of the first bobbin 3 and the connecting portion of the second bobbin 4 are close to the inside and the outside of the bearing, respectively, as the first connecting portion 32 is close to the inside of the bearing and the second connecting portion 42 is close to the outside of the bearing. The extended portions of the first bobbin 3 and the extended portions of the second bobbin 4 are alternately arranged and overlapped in the bearing radial direction, as are the first extended portions 31 and the second extended portions 41, so as to define the clearance passage 1 a.

Wherein, the extension part of the first framework 3 and the extension part of the second framework 4 which are adjacent (in the middle) and can realize the sealing function define a sealing gap. The seal gap 1aa is defined as the first extension 31 and the second extension 41. Meanwhile, two other adjacent extensions define the receiving gap, such as the adjacent first extension 31 and second extension 41 located on the radial inner side of the bearing define the first receiving gap 1ab, and the adjacent first extension 31 and second extension 41 located on the radial outer side of the bearing define the second receiving gap 1ac, respectively.

Therefore, the clearance passage 1a includes: and the accommodating gaps comprise a first accommodating gap 1ab and a second accommodating gap 1ac which are arranged along the radial direction of the bearing. Wherein the first receiving gap 1ab is located radially outside the bearing, and the second receiving gap 1ac is located radially inside the bearing. The hub bearing still includes: seals in the receiving gap, respectively a first seal 5 in the first receiving gap 1ab and a second seal 15 in the second receiving gap 1ac, are provided for blocking the gap passage 1 a. Wherein the first seal 5 is located radially outside the bearing and the second seal 15 is located radially inside the bearing.

Wherein an opening 1c of the clearance passage 1a toward the outside of the bearing is formed in the first accommodation clearance 1ab, and the first seal 5 can block the contaminant outside the bearing from intruding into the clearance passage 1 a. An opening 1b of the clearance passage 1a toward the inside of the bearing is formed in the second accommodation clearance 1ac, and the second seal 15 can block the leakage of the lubricating oil inside the bearing while achieving the purpose of further blocking the intrusion of the external contaminants into the inside of the bearing.

Particularly, when the wheel is in sharp turning, the central axis of the inner ring 1 swings, so that the second framework 4 inclines. In the prior art, because the opening towards the outside of the bearing is short along the axial path of the bearing, when a wheel sharply turns, a gap is exposed between the sealing ring and a framework which is in contact with the sealing ring, external pollutants pass through the gap and are gathered in the sealing ring, and the gathered pollutants abrade the sealing ring when the inner ring and the outer ring relatively rotate, so that the sealing ring fails. In contrast, in the present embodiment, when the second frame 4 tilts with the inner ring 1, the first sealing element 5 is pressed, the first receiving gap 1ab is a gap portion of the gap channel 1a closest to the outer ring 2, and the first sealing element 5 is closer to the adjacent first extension 31 toward the outer ring 2. Therefore, the first seal 5 does not expose the gap, and can better block external contaminants from passing through the first seal 5, so that the first seal 5 is prevented from being worn, and the service life of the first seal 5 is prolonged.

When the second framework 4 tilts, the second sealing element 15 is simultaneously pressed, the second accommodating gap 1ac is the gap part of the gap channel 1a closest to the inner ring 1, and the second sealing element 15 is more closely attached to the adjacent first extension part 31, so that the lubricating oil leakage is better blocked.

When assembled, the first skeleton 3 may be fixed to the inner peripheral surface of the outer ring 2 by interference fit with the first extending portion 31 closest to the outer ring 2. The second frame 4 can be fitted over the inner ring 1 with an interference fit via the second extension 41 closest to the inner ring 1. The first extension part 31 and the second extension part 41 both extend along the axial direction of the bearing, so that the outer ring 2 and the inner ring 1 respectively have larger connecting surfaces, and the installation is firm and reliable.

The seal is attached to one of the first backbone 3 and the second backbone 4, wherein the other of the first backbone 3 and the second backbone 4 has two surfaces facing the seal in the axial direction and the radial direction of the bearing. The first extension portion 31 and the first connection portion 32, which are located radially outside the bearing, respectively, on the two surfaces in the first bobbin 3, if the first seal 5 is attached to the second bobbin 4; the second seal member 15 is attached to the first bobbin 3 while both surfaces of the second bobbin 4 are located at the second extending portion 41 and the second connecting portion 42, respectively, on the radially inner side of the bearing.

Wherein, the sealing member includes: and a first seal lip 51 and a second seal lip 52 which are respectively in contact seal with the two surfaces. For example, in the first seal 5, the first seal lip 51 is contact-sealed to the first extension portion 31 and the second seal lip 52 is contact-sealed to the first connection portion 32; in the second seal member 15, the first seal lip 51 is contact-sealed to the second extension portion 41 and the second seal lip 52 is contact-sealed to the second connection portion 42. When the inner ring 1 inclines, the first sealing element 5 is more tightly contacted with the first extension part 31 through the first sealing lip 51, and the second sealing element 15 is more tightly contacted with the second extension part 41 through the first sealing lip 51, so that the sealing effect is better.

The seal gap 1aa is located between the two housing gaps, the first housing gap 1ab and the second housing gap 1 ac. In a variant, the first frame and the second frame may each comprise at least two frame units connected together, in which case there may be more than two receiving gaps, and the sealing gap may be located between two adjacent receiving gaps.

The first seal 5 and the second seal 15 each include a first seal lip 51 and a second seal lip 52, and may be attached to the second frame 4 by vulcanization. Besides the first sealing element 5 and the second sealing element 15 of such a structure, the sealing elements may be selected from sealing rings, and the sealing rings and the adjacent first extension 31 and second extension 41 may be in tight fit.

The first direction a is the bearing axial direction, and therefore the seal gap 1aa extends in the axial direction. In a modification, the first direction may be a radial direction of the bearing, for example, each of the first frame and the second frame may include an extension portion extending in the radial direction of the bearing, and adjacent extension portions thereof are axially opposite to each other in the axial direction of the bearing to form a seal gap extending in the radial direction of the bearing. In addition to this, the first direction may be defined as other directions having an angle with the axial direction of the bearing.

Second embodiment

Referring to fig. 2, the second embodiment is different from the first embodiment in that:

the seal gaps include a first seal gap 10a and a second seal gap 10b arranged in the radial direction of the bearing, the first seal gap 10a being located radially outside the bearing, and the second seal gap 10b being located between the radially inside and outside of the bearing. This may improve the sealing effect of the hub bearing.

One of the second extending portions 71 of the second frame 7 extends into between two of the first extending portions 61 of the first frame 6, so that the first extending portion 61 located at the radial outer side of the bearing and the adjacent second extending portion 71 define a first sealing gap 10a, the second extending portion 71 and the other first extending portion 61 define a second sealing gap 10b, and the first sealing gap 10a and the second sealing gap 10b share the second extending portion 71.

Therefore, the first seal gap 10a is folded back after extending to the end 10c along the first direction a, and continues to extend along the opposite direction of the first direction a, forming the second seal gap 10 b. Wherein, the end portion 10c is defined by the second extending portion 71 and the first connecting portion 62 in the first framework 6. The labyrinth seal gap with the zigzag path is formed between the first seal gap 10a and the second seal gap 10b, so that the difficulty of external pollutants entering the bearing from the outside of the bearing is increased, the risk of the external pollutants entering the bearing from the outside of the bearing is reduced, and the hub bearing has a good sealing effect. In particular, such a labyrinth seal gap can block the intrusion of external contaminants into the receiving gap 10d, thereby limiting the excessive wear of the seal 50 by external contaminants and increasing the service life of the seal 50.

In a modification, when the first bobbin and the second bobbin each include at least two bobbin units, the seal gap may include at least two arranged in the radial direction of the bearing, and two seal gaps adjacent in the radial direction of the bearing may be provided with reference to the first seal gap 10a and the second seal gap 10b shown in fig. 2.

Further, the receiving gap 10d is located radially inward of the bearing, and the seal 50 is attached to the first frame 6 and the outer ring 20, which provides higher stability. Also, the seal 50 includes: two first seal lips 510 that contact and seal with the other second extension 72 in the second frame 7.

Third embodiment

Referring to fig. 3, the third embodiment is different from the second embodiment in that:

the second seal gap 100b is located radially inward of the bearing, and the accommodation gap 100c is located between the first seal gap 100a and the second seal gap 100 b.

In this modification, when the first bobbin and the second bobbin each include at least two bobbin units, the seal gap may include at least two seal gaps arranged in the radial direction of the bearing, and the receiving gap may be located between two adjacent seal gaps.

Referring to the first, second and third embodiments, the number and arrangement of the sealing gaps and accommodating gaps in the gap channel may be varied and may be replaced accordingly.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A hub bearing comprising: an inner ring;

an outer ring surrounding the inner ring;

the first framework and the second framework are positioned in a radial gap between the inner ring and the outer ring, are respectively fixed on the inner ring and the outer ring, and jointly define a gap channel, and the gap channel is provided with an opening facing the inside of the bearing and an opening facing the outside of the bearing;

characterized in that said clearance passage comprises:

a seal gap extending in a first direction and surrounding the inner race;

the cross section of first skeleton and second skeleton roughly is the U type that includes two extensions, the U type opening of first skeleton and second skeleton sets up relatively, and the two overall configuration makes its one's own extension can insert the U type opening of each other, the extension radially arranges in turn.

2. The hub bearing of claim 1, wherein the extensions of each of the bobbins surround the inner ring and are arranged in a radial direction of the bearing, the first and second bobbins further include:

the connecting part is connected with the same end of the two extending parts along the axial direction of the bearing;

the connecting parts of the first framework and the second framework are respectively close to the inside and the outside of the bearing, and the extending parts of the first framework and the extending parts of the second framework are alternately arranged and overlapped along the radial direction of the bearing, so that the gap channel is defined;

wherein the extension part of the first framework and the extension part of the second framework which are adjacent to each other and can realize the sealing function define the sealing gap.

3. The hub bearing of claim 1 or 2, wherein the seal gap comprises a first seal gap and a second seal gap arranged radially of the bearing.

4. The hub bearing of claim 3, wherein the first seal gap extends in the first direction to an end and then turns back and continues in a direction opposite the first direction to form the second seal gap.

5. The hub bearing of claim 2, wherein the clearance channel further comprises:

the accommodating gap is defined by two adjacent extending parts;

the hub bearing further includes:

a seal member received in the receiving gap for blocking the gap passage.

6. The hub bearing of claim 1, wherein the clearance channel further comprises:

a receiving gap;

the hub bearing further includes:

a seal located within the receiving gap for blocking the gap passage.

7. A hub bearing according to claim 5 or 6, wherein the sealing element is a sealing ring.

8. The hub bearing of claim 5 or 6, wherein the seal is attached to one of the first and second bobbins, the other of the first and second bobbins having two surfaces facing the seal in the bearing axial and radial directions;

the seal includes:

and the first sealing lip and the second sealing lip are respectively in contact sealing with the two surfaces.

9. The hub bearing of claim 5 or 6, wherein the receiving gaps comprise at least two arranged in a radial direction of the bearing, and the sealing gap is located between two adjacent receiving gaps.

10. The hub bearing of claim 5 or 6, wherein the seal gaps comprise at least two arranged in a radial direction of the bearing, and the receiving gap is located between two adjacent seal gaps.

11. A hub bearing according to claim 5 or 6, wherein the receiving clearance is a clearance portion of the clearance channel closest to the inner or outer ring.

12. The hub bearing of claim 1, wherein the first direction is either a bearing axial direction or a bearing radial direction.