Hub bearing unit

Abstract

The utility model provides a hub bearing unit, and particularly relates to the field of bearings. The hub bearing unit comprises a first bearing and a second bearing which are coaxially arranged, the first bearing comprises a first inner ring, and the second bearing comprises a second inner ring. The hub bearing unit further comprises a sealing piece, the sealing piece is arranged between the first inner ring and the second inner ring, the sealing piece comprises a first sealing body, a second sealing body and a connecting body, the first sealing body is arranged on the outer side of the first inner ring and the outer side of the second inner ring, and the second sealing body is arranged on the outer side of the second inner ring. The first sealing body is arranged on the inner side of the first inner ring, the second sealing body is arranged on the inner side of the second inner ring, the connecting body is connected with the first sealing body and the second sealing body, and the first sealing body, the second sealing body and the connecting body are integrally formed. The sealing piece is simple in structure and convenient to install, and the sealing performance of the hub bearing unit is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of bearings, in particular to a wheel hub bearing unit. Background Art

[0002] The wheel hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It combines two sets of bearings into an integrated structure, and has the advantages of good assembly performance, no clearance adjustment, light weight, compact structure, and large load capacity. In order to improve the performance of the bearing unit and extend the service life of the bearing, lubricating substances need to be injected into the wheel hub bearing unit before use, and substances need to be added between the wheel hub bearing unit and the hub shaft. In order to avoid leakage of lubricating substances in the wheel hub bearing unit or external lubricating oil of the bearing unit and the hub shaft entering the bearing unit during operation, affecting the operation quality of the bearing unit, a sealing device needs to be installed between the two sets of bearings. The sealing device is generally composed of multiple components, with a relatively complicated structure and poor sealing performance. The bearing unit still has the risk of oil seepage and oil leakage. Utility Model Content

[0003] In view of the above shortcomings of the prior art, the utility model provides a wheel hub bearing unit to improve the problem of poor sealing performance of the wheel hub bearing unit.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a wheel hub bearing unit, the wheel hub bearing unit comprises a first bearing and a second bearing arranged coaxially, the first bearing comprises a first inner ring, and the second bearing comprises a second inner ring. The wheel hub bearing unit also comprises a seal, the seal is arranged between the first inner ring and the second inner ring, the seal comprises a first sealing body, a second sealing body and a connecting body, the first sealing body is arranged on the outside of the first inner ring and the second inner ring, the second sealing body is arranged on the inside of the first inner ring and the second inner ring, the connecting body connects the first sealing body and the second sealing body, and the first sealing body, the second sealing body and the connecting body are integrally formed.

[0005] In an example of the present invention, a first connection portion is provided on one side of the first inner ring close to the second inner ring, a second connection portion is provided on one side of the second inner ring close to the first inner ring, a groove is provided on both the first connection portion and the second connection portion, and the connector includes a protrusion that matches the groove of the first connection portion and the groove of the second connection portion after being assembled.

[0006] In an example of the present invention, the first connection portion and the first inner ring, and the second connection portion and the second inner ring are integrally formed.

[0007] In one example of the present invention, the connector includes a first connector, a second connector and a third connector connected in sequence, the first connector is connected to the first sealing body, and the third connector is connected to the second sealing body; the first connector and the third connector are protrusions arranged in the groove.

[0008] In an example of the present invention, the first connector and the third connector are spherical, and the second connector is sheet-shaped.

[0009] In an example of the present invention, along the radial direction of the hub bearing unit, two ends of the first inner ring are provided with ribs, and two ends of the second inner ring are also provided with ribs.

[0010] In an example of the utility model, the first bearing includes a first outer ring, the second bearing includes a second outer ring, the first outer ring is rotatably connected to the first inner ring via a rolling body, the second outer ring is rotatably connected to the second inner ring via a rolling body, and a rib is provided at one end of the first outer ring and the second outer ring close to the seal.

[0011] In an example of the present invention, the ribs on the first inner ring are integrally formed with the first inner ring, the ribs on the second inner ring are integrally formed with the second inner ring, the ribs on the first outer ring are integrally formed with the first outer ring, and the ribs on the second outer ring are integrally formed with the second outer ring.

[0012] In an example of the present invention, avoidance grooves are further provided on the first inner ring and the second inner ring. The avoidance grooves are provided on the inner side of the retaining edge and are arc surfaces.

[0013] In an example of the present invention, the rib is parallel to the end surface of the rolling element.

[0014] The hub bearing unit provided by the utility model is provided with a sealing member between the first inner ring of the first bearing and the second inner ring of the second bearing, the first sealing body of the sealing member is located on the outer sides of the first inner ring and the second inner ring, the second sealing body of the sealing member is located on the inner sides of the first inner ring and the second inner ring, the first sealing body and the second sealing body are connected by a connecting body, and the first sealing body, the second sealing body and the connecting body are integrally formed, which can effectively improve the sealing performance between the first inner ring and the second inner ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic structural diagram of a wheel hub bearing unit of the utility model in one embodiment;

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle A area;

[0018] Figure 3 The figure is a schematic structural diagram of a seal in an embodiment of a hub bearing unit of the present invention.

[0019] Component number description

[0020] 100, first bearing; 110, first inner ring; 111, first connecting portion; 112, rib; 120, first outer ring; 200, second bearing; 210, second inner ring; 211, second connecting portion; 220, second outer ring; 300, seal; 310, first sealing body; 320, second sealing body; 330, connecting body; 331, first connecting body; 332, second connecting body; 333, third connecting body. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0022] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present utility model without substantially changing the technical content.

[0023] See also Figures 1 to 3 The utility model provides a wheel hub bearing unit, which includes a first bearing 100 and a second bearing 200 which are coaxially arranged and a sealing member 300.

[0024] The first bearing 100 includes a first inner ring 110 and a first outer ring 120, the first outer ring 120 and the first inner ring 110 are coaxially arranged, and the first outer ring 120 is rotatably connected to the first inner ring 110 via rolling bodies; the second bearing 200 includes a second inner ring 210 and a second outer ring 220, the second outer ring 220 and the second inner ring 210 are coaxially arranged, and the second outer ring 220 is rotatably connected to the second inner ring 210 via rolling bodies. There is no restriction on the number of rolling bodies here, and it can be adjusted according to actual needs.

[0025] The seal 300 is arranged between the first inner ring 110 and the second inner ring 210. The seal 300 includes a first sealing body 310, a second sealing body 320 and a connecting body 330. The first sealing body 310 is arranged on the outside of the first inner ring 110 and the second inner ring 210, the second sealing body 320 is arranged on the inside of the first inner ring 110 and the second inner ring 210, and the connecting body 330 connects the first sealing body 310 and the second sealing body 320. The first sealing body 310, the second sealing body 320 and the connecting body 330 are integrally formed. Here, the outside of the first inner ring 110 and the second inner ring 210 is the side of the first inner ring 110 and the second inner ring 210 close to the hub shell, and the inside of the first inner ring 110 and the second inner ring 210 is the side of the first inner ring 110 and the second inner ring 210 away from the hub shell. The present application does not limit the shape of the connecting body 330. For example, the connecting body 330 can be other three-dimensional structures such as a cuboid, a cube or a cylinder.

[0026] The side of the first sealing body 310 facing the second sealing body 320 is in contact with the outer sides of the first inner ring 110 and the second inner ring 210, the side of the second sealing body 320 facing the first sealing body 310 is in contact with the inner sides of the first inner ring 110 and the second inner ring 210, and the connecting body 330 is interference fit with the first inner ring 110 and the second inner ring 210. The material of the sealing member 300 is not limited here, and it is sufficient to ensure that the sealing member 300 has good contact with the first inner ring 110 and the second inner ring 210 and has good oil resistance and durability. Exemplarily, the sealing member 300 is made of fluororubber. The sealing member 300 is integrally formed, has a simple structure, is easy to install, and can effectively improve the sealing performance of the hub bearing unit.

[0027] See also Figure 1In one embodiment, a first connection portion 111 is provided on a side of the first inner ring 110 close to the second inner ring 210, and a second connection portion 211 is provided on a side of the second inner ring 210 close to the first inner ring 110. A groove is provided on both the first connection portion 111 and the second connection portion 211. The connecting body 330 includes a protrusion matching the groove, and a side of the protrusion close to the first connection portion 111 matches the groove of the first connection portion 111, and a side of the protrusion close to the second connection portion 211 matches the groove of the second connection portion 211. The shape of the groove of the first connection portion 111 and the shape of the groove of the second connection portion 211 may be the same or different. The first connection portion 111 and the first inner ring 110 may be fixedly connected in any manner, and the second connection portion 211 and the second inner ring 210 may also be fixedly connected in any manner, such as welding or integral molding. In this embodiment, the first connection portion 111 and the first inner ring 110 are integrally molded, and the second connection portion 211 and the second inner ring 210 are integrally molded.

[0028] See also Figures 1 to 3 In one embodiment, the connector 330 includes a first connector 331, a second connector 332, and a third connector 333 connected in sequence, the first connector 331 is connected to the first sealing body 310, and the third connector 333 is connected to the second sealing body 320; the first connector 331 and the third connector 333 are protrusions arranged in the groove. The structure of the first connector 331 and the third connector 333 is not limited here, and the first connector 331 and the third connector 333 can be a cube, a cuboid or other irregular three-dimensional structures, so that the first connector 331, the second connector 332, and the third connector 333 are interference fit with the grooves of the first connecting part 111 and the second connecting part 211, and prevent the lubricating material on both sides of the first inner ring 110 and the second inner ring 210 from leaking to the other side. Exemplarily, the first connector 331 and the third connector 333 are spherical, and the second connector 332 is sheet-shaped.

[0029] See also Figure 1 In one embodiment, along the radial direction of the hub bearing unit, ribs 112 are provided at both ends of the first inner ring 110, and ribs 112 are also provided at both ends of the second inner ring 210. The ribs 112 are circumferentially distributed along the central axis of the hub bearing unit, and are used to support and guide the rolling elements and keep them in the bearing. The ribs on the first inner ring 110 can be fixedly connected to the first inner ring 110 in any manner, and the ribs on the second inner ring 210 can also be fixedly connected to the second inner ring 210 in any manner, such as welding or integral molding. In this embodiment, the ribs on the first inner ring 110 are integrally molded with the first inner ring 110, and the ribs on the second inner ring 210 are also integrally molded with the second inner ring 210.

[0030] Preferably, the first outer ring 120 and the second outer ring 220 are both provided with a flange 112 at one end close to the seal 300 to reduce the amount of movement of the rolling element along its axial direction during rotation and enhance the stability of the hub bearing unit. The flange on the first outer ring 120 can be fixedly connected to the first outer ring 120 in any manner, and the flange on the second outer ring 220 can also be fixedly connected to the second outer ring 220 in any manner. The fixed connection method includes but is not limited to welding or integral molding. In this embodiment, the flange on the first outer ring 120 is integrally molded with the first outer ring 120, and the flange on the second outer ring 220 is also integrally molded with the second outer ring 220. Preferably, the flange 112 is parallel to the end face of the rolling element.

[0031] In other embodiments, the first inner ring 110 and the second inner ring 210 are further provided with avoidance grooves, which are arranged on the inner side of the rib 112. The avoidance grooves are arc surfaces, which are circumferentially distributed around the central axis of the bearing, so as to facilitate the processing of the first inner ring 110 and the second inner ring 210, and can also be used to store lubricating substances and lubricate the bearing unit when in use.

[0032] The hub bearing unit provided by the utility model has a seal arranged between the first inner ring of the first bearing and the second inner ring of the second bearing, the first seal body of the seal is located outside the first inner ring and the second inner ring, the second seal body of the seal is located inside the first inner ring and the second inner ring, the first seal body and the second seal body are connected by a connector, and the first seal body, the second seal body and the connector are integrally formed, which can effectively improve the sealing performance between the first inner ring and the second inner ring. Therefore, the utility model effectively overcomes some practical problems in the prior art and has high utilization value and use significance.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A wheel hub bearing unit, comprising a first bearing and a second bearing arranged coaxially, wherein the first bearing comprises a first inner ring, and the second bearing comprises a second inner ring, wherein: The hub bearing unit further comprises a seal; The seal is arranged between the first inner ring and the second inner ring, and the seal includes a first sealing body, a second sealing body and a connecting body. The first sealing body is arranged on the outer sides of the first inner ring and the second inner ring, and the second sealing body is arranged on the inner sides of the first inner ring and the second inner ring. The connecting body connects the first sealing body and the second sealing body, and the first sealing body, the second sealing body and the connecting body are integrally formed.

2. The wheel hub bearing unit according to claim 1, characterized in that: A first connecting portion is provided on one side of the first inner ring close to the second inner ring, and a second connecting portion is provided on one side of the second inner ring close to the first inner ring. Grooves are provided on both the first connecting portion and the second connecting portion, and the connecting body includes a protrusion matching the groove.

3. The wheel hub bearing unit according to claim 2, characterized in that: The first connection portion and the first inner ring and the second connection portion and the second inner ring are integrally formed.

4. The wheel hub bearing unit according to claim 2, characterized in that: The connector includes a first connector, a second connector and a third connector which are connected in sequence, the first connector is connected to the first sealing body, and the third connector is connected to the second sealing body; the first connector and the third connector are protrusions arranged in the groove.

5. The wheel hub bearing unit according to claim 4, characterized in that: The first connector and the third connector are spherical, and the second connector is sheet-shaped.

6. The wheel hub bearing unit according to claim 1, characterized in that: Along the radial direction of the hub bearing unit, two ends of the first inner ring are provided with ribs, and two ends of the second inner ring are also provided with ribs.

7. The wheel hub bearing unit according to claim 6, characterized in that: The first bearing includes a first outer ring, and the second bearing includes a second outer ring. The first outer ring is rotatably connected to the first inner ring via a rolling body, and the second outer ring is rotatably connected to the second inner ring via a rolling body. The first outer ring and the second outer ring are both provided with a rib at one end close to the seal.

8. The wheel hub bearing unit according to claim 7, characterized in that: The ribs on the first inner ring are integrally formed with the first inner ring, the ribs on the second inner ring are integrally formed with the second inner ring, the ribs on the first outer ring are integrally formed with the first outer ring, and the ribs on the second outer ring are integrally formed with the second outer ring.

9. The wheel hub bearing unit according to claim 7, characterized in that: The first inner ring and the second inner ring are also provided with avoidance grooves, the avoidance grooves are arranged on the inner side of the retaining edge, and the avoidance grooves are arc surfaces.

10. The wheel hub bearing unit according to claim 7, characterized in that: The rib is parallel to the end surface of the rolling body.

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