Hub bearing unit, automobile wheel and automobile

Abstract

The utility model provides a hub bearing unit, an automobile wheel and an automobile, the hub bearing unit comprises a first inner ring of a first bearing and a first sealing piece, and the first sealing piece comprises a first inner framework and a first supporting body; the first inner framework surrounds and is in lap joint with one end of the first inner ring; the first supporting body is clamped between the hub shell and the first inner framework and seals one end of the hub shell and one end of the first bearing. Wherein the first supporting body comprises a first main lip part and a first auxiliary lip part which are arranged oppositely in the axial direction, and the first main lip part and the first auxiliary lip part abut against the first inner framework. According to the hub bearing unit, the design of a multi-lip structure arranged oppositely is adopted, and the multi-lip structure abuts against the first inner framework in an attached mode, so that dust prevention can be achieved, pressure relief through the first auxiliary lip part of the first sealing piece can be prevented, and lubricating grease in the first bearing is prevented from leaking.

Description

Technical Field

[0001] This utility model relates to the field of wheel hub bearing design technology, specifically to a wheel hub bearing unit, an automobile wheel, and an automobile. Background Technology

[0002] Currently, with the rapid development of the automotive industry, the demand for wheel bearing units is constantly increasing, especially in the passenger car and commercial vehicle markets. Changes in market demand have driven technological advancements and optimizations in wheel bearing units. Passenger car wheel bearing units typically have a service life of 80,000-100,000 kilometers and need to be replaced on average every 5-6 years. However, in actual operation, there have been numerous cases of oil leakage and seepage in wheel bearings due to inadequate sealing systems, affecting the operational quality of the bearing unit and causing premature bearing failure. Utility Model Content

[0003] In view of the problems existing in the prior art, the present invention provides a wheel hub bearing unit, a car wheel and a car, to improve the technical problem that the sealing system of the existing wheel hub bearing unit is not perfect, which leads to easy oil leakage and affects the bearing life.

[0004] To achieve the above and other related objectives, the first aspect of this utility model provides a hub bearing unit, comprising a first bearing and a first seal. The first bearing is sandwiched between a hub housing and a rotating shaft, and includes a first inner ring. The first seal includes a first inner skeleton and a first support body. The first inner skeleton surrounds and overlaps one end of the first inner ring. The first support body is sandwiched between the hub housing and the first inner skeleton, and seals the hub housing and one end of the first bearing. The first support body includes a first main lip and a first secondary lip arranged axially opposite to each other, with the first main lip and the first secondary lip respectively abutting against the first inner skeleton.

[0005] In one embodiment of the hub bearing unit of this utility model, the hub bearing unit further includes a second bearing and a second seal. The second bearing is sandwiched between the hub shell and the rotating shaft and is coaxially arranged with the first bearing. The second bearing includes a second inner ring, and the second seal includes a second inner skeleton and a second support body. The second inner skeleton surrounds and overlaps one end of the second inner ring; the second support body is sandwiched between the hub shell and the first inner skeleton and seals the hub shell and one end of the second bearing. The second support body includes a second main lip and a second secondary lip arranged axially opposite to each other, with the second main lip and the second secondary lip respectively abutting against the second inner skeleton.

[0006] In one embodiment of the hub bearing unit of this utility model, a sealing cavity is formed between the first bearing and the second bearing; a first pressure relief valve is provided on the hub shell, and the first pressure relief valve connects the sealing cavity to the outside of the sealing cavity; a second pressure relief valve is provided on the first inner ring and / or the second inner ring, and the second pressure relief valve connects the outside of the sealing cavity to the sealing cavity.

[0007] In one embodiment of the hub bearing unit of this utility model, the first pressure relief valve and the second pressure relief valve are one-way valves.

[0008] In one embodiment of the hub bearing unit of this utility model, the first inner frame includes a first overlapping portion and a plurality of first fitting portions. The first overlapping portion surrounds and overlaps the outer periphery of the first inner ring; the first overlapping portion is coaxially arranged with the rotating shaft. A plurality of first fitting portions are arranged around one end of the first overlapping portion, and a plurality of sets of first fitting portions engage with the first inner ring.

[0009] In one embodiment of the hub bearing unit of this utility model, the surface roughness of the first inner skeleton that abuts the first main lip and the first secondary lip is Ra, where Ra≤0.04μm.

[0010] In one embodiment of the wheel hub bearing unit of this utility model, the first inner skeleton is made of nylon.

[0011] In one embodiment of the hub bearing unit of this utility model, the first inner frame further includes a first extension portion, which is disposed at the end of the first overlapping portion away from the first secondary lip portion, and the first extension portion overlaps and connects to the rotating shaft.

[0012] A second aspect of this utility model also provides an automobile wheel, the automobile wheel including the hub bearing unit described in any of the above claims.

[0013] A third aspect of this utility model also provides an automobile, which includes the aforementioned automobile wheels.

[0014] In the wheel hub bearing unit, automobile wheel, and automobile of this utility model, the wheel hub bearing unit adopts a multi-lip structure design, with a first main lip and a first secondary lip arranged axially opposite to each other. The first main lip and the first secondary lip are arranged opposite to each other and both fit against the first inner skeleton, which can not only achieve dust prevention but also prevent pressure leakage through the first secondary lip of the first seal, thus preventing the leakage of lubricating grease in the first bearing. Multiple lip structures are arranged sequentially to form a multi-layer sealing barrier. This design not only improves the sealing performance but also extends the service life of the seal to a certain extent. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the hub bearing unit of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of one embodiment of the hub bearing unit of this utility model;

[0018] Figure 3 for Figure 2 A magnified structural diagram at point A;

[0019] Figure 4 for Figure 2 A magnified structural diagram at point B;

[0020] Figure 5 for Figure 2 A magnified structural diagram at point C.

[0021] Component designation explanation:

[0022] 100, First bearing; 110, First inner ring; 120, First outer ring; 130, Rolling element; 140, Cage; 200, First seal; 210, First inner skeleton; 211, First overlap; 212, First fitting; 213, First extension; 220, First support; 221, First outer skeleton; 222, First sealing lip; 223, First main lip; 224, First secondary lip; 300, Second bearing; 310, Second inner ring; 400, Second seal; 410, Second inner skeleton; 420, Second support; 421, Second main lip; 422, Second secondary lip; 500, Sealing cavity; 510, First pressure relief valve; 520, Second pressure relief valve; 600, Hub housing; 700, Shaft. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0024] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0025] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0026] To address the technical problem of imperfect sealing systems in existing wheel hub bearing units, which easily lead to oil leakage and affect bearing life, this utility model provides a wheel hub bearing unit, an automobile wheel, and an automobile. This wheel hub bearing unit employs a multi-lip structure design to achieve dust prevention, prevent bearing pressure loss through the seal, and reduce lubricant leakage.

[0027] Please see Figures 1 to 5 The first aspect of this utility model provides a hub bearing unit, which includes a first bearing 100 and a first seal 200. The first bearing 100 is a relatively inner bearing and includes a first inner ring 110, a first outer ring 120, rolling elements 130 located between the two, and a cage 140. The specific assembly and connection of the components of the first bearing 100 can refer to the existing bearing structure, and will not be described in detail here. The first inner ring 110 is sleeved and installed on the rotating shaft 700, and the first outer ring 120 is sleeved and installed inside the hub housing 600, thereby clamping the first bearing 100 between the hub housing 600 and the rotating shaft 700.

[0028] Please see Figure 2 and Figure 3 The first seal 200 serves as a combined sealing structure of the first bearing 100 and the hub housing 600 at one end. The first seal 200 is sandwiched between the first inner ring 110 of the first bearing 100 and the hub housing 600, and is coaxially arranged with the first bearing 100. The first seal 200 includes a first inner skeleton 210 and a first support 220. The first inner skeleton 210 surrounds and overlaps one end of the first inner ring 110; the first support 220 is sandwiched between the outer surface of the hub housing 600 and the first inner skeleton 210, and seals the hub housing 600 and one end of the first bearing 100.

[0029] Please refer to Figure 3 The first support 220 includes a first outer frame 221 and a first sealing lip 222. The first outer frame 221 and the first sealing lip 222 are assembled together. The outer rings of the first outer frame 221 and the first sealing lip 222 abut against the hub shell 600. The inner ring of the first sealing lip 222 is provided with a first main lip 223 and a first secondary lip 224. The first main lip 223 and the first secondary lip 224 are arranged opposite each other along the axial direction. The first main lip 223 is inclined along the axial direction towards the side closer to the outer end of the first inner ring 110. At the same time, the first main lip 223 fits against the first inner frame 210 to achieve a seal between them. The angle of the first secondary lip 224 is opposite to the tilt angle of the first main lip 223. The first secondary lip 224 tilts towards the rolling element 130 and abuts against the first inner skeleton 210. Adding a first secondary lip 224 opposite to the original first main lip 223 not only prevents dust but also prevents pressure leakage through the first secondary lip 224 of the first seal 200, thus preventing lubricating grease leakage from the first bearing 100. The number of first main lips 223 and first secondary lips 224 is unlimited, as long as at least one set of first main lips 223 and first secondary lips 224 are opposite to each other. Multiple lip structures are arranged sequentially to form a multi-layered sealing barrier. This design not only improves sealing performance but also extends the service life of the seal to a certain extent.

[0030] Please see Figure 2 and Figure 5 In one embodiment of the hub bearing unit of this utility model, the hub bearing unit further includes a second bearing 300 and a second seal 400. The second bearing 300 has the same structure as the first bearing 100 and is coaxially mounted on the rotating shaft 700. The inner ends of the first bearing 100 and the second bearing 300 are connected by a sealing connector. The second bearing 300 is sandwiched between the hub housing 600 and the rotating shaft 700, and the second bearing 300 includes a second inner ring 310.

[0031] Please see Figure 5 The second seal 400 has the same structure as the first seal 200, both being combined sealing structures. The second seal 400 includes a second inner skeleton 410 and a second support 420. The second inner skeleton 410 surrounds and overlaps one end of the second inner ring 310. The second support 420 is sandwiched between the hub shell 600 and the first inner skeleton 210, sealing one end of the hub shell 600 and the second bearing 300. The second support 420 includes a second main lip 421 and a second secondary lip 422 arranged axially opposite to each other, with the second main lip 421 and the second secondary lip 422 respectively abutting against the second inner skeleton 410. The cooperation of the second main lip 421 and the second secondary lip 422 achieves an end seal between the second bearing 300 and the hub shell 600, thus achieving dust prevention, pressure relief prevention, and lubricant leakage prevention.

[0032] Please see Figure 1 , Figure 2 and Figure 4 In one embodiment of the hub bearing unit of this utility model, the first bearing 100 and the second bearing 300 are both sandwiched between the hub housing 600 and the rotating shaft 700, and their ends are sealed by the first sealing element 200 and the second sealing element 400. Therefore, a sealing cavity 500 is formed between the first bearing 100 and the second bearing 300. In one embodiment, a first pressure relief valve 510 is provided on the hub housing 600. The first pressure relief valve 510 is a one-way valve, and it connects the sealing cavity 500 with the outside of the sealing cavity 500, that is, it enables one-way flow from the sealing cavity 500 to the outside of the hub housing 600. When the bearing operates at high speed, the pressure inside the sealing cavity 500 increases, and it can be relieved through the first pressure relief valve 510. In this embodiment, a second pressure relief valve 520 is provided on the second inner ring 310. The second pressure relief valve 520 is a one-way valve, and it enables one-way flow from the outside of the sealing cavity 500 to the inside of the sealing cavity 500. When the bearing is stationary, if the pressure inside the sealing cavity 500 is too low, the pressure can be replenished through the one-way valve on the inner ring of the bearing to ensure that it can maintain stable performance under high-speed operating conditions. However, in other embodiments, the second pressure relief valve 520 can also be provided on the first inner ring 110, which will not be described in detail here.

[0033] Please see Figure 3In one embodiment of the hub bearing unit of this utility model, the first inner frame 210 includes a first overlapping portion 211 and a plurality of first fitting portions 212. The first overlapping portion 211 surrounds and overlaps the outer periphery of the first inner ring 110; the first overlapping portion 211 is coaxially arranged with the rotating shaft 700; a plurality of first fitting portions 212 are arranged around one end of the first overlapping portion 211; a plurality of sets of first fitting portions 212 engage one side of the first inner ring 110. Specifically, in this embodiment, the number of first fitting portions 212 is 20, and the 20 first fitting portions 212 surround and engage with the side of the first inner ring 110, thereby achieving the assembly and fixation between the first inner frame 210 and the first inner ring 110, and preventing the first inner frame 210 from slipping.

[0034] In one embodiment of the hub bearing unit of this utility model, the surface roughness of the first inner skeleton 210 that abuts against the first main lip 223 and the first secondary lip 224 is Ra, where Ra ≤ 0.04 μm. By limiting the surface roughness of the contact between the first inner skeleton 210 and the first support 220, the friction between the first sealing lip 222 and the first inner skeleton 210 is reduced, energy loss is reduced, operating efficiency is improved, and the lifespan of the first seal 200 is increased.

[0035] In one embodiment of the hub bearing unit of this utility model, the first inner skeleton 210 is made of nylon. Using a nylon first inner skeleton 210 instead of a cold-formed steel first inner skeleton 210 reduces the hardness of the nylon material, thus decreasing the hardness difference between the sealing lip and the inner skeleton, thereby reducing the friction between them. It should be noted that the structure of the first inner skeleton 210 in the above embodiment is consistent with the structure of the second inner skeleton 410, and will not be described again here.

[0036] Please see Figure 3 In one embodiment of the hub bearing unit of this utility model, the first inner frame 210 further includes a first extension 213. The first extension 213 is disposed at one end of the first overlapping portion 211 away from the first secondary lip 224. The first extension 213 overlaps and connects to the rotating shaft 700, which serves as a dustproof function.

[0037] The second aspect of this utility model also provides an automobile wheel, which includes the hub bearing unit described in any of the above claims. It should be noted that the automobile wheel described in this embodiment may also include, but is not limited to, conventional components and structures of existing automobile wheels such as tires, brake discs, spokes, and rims, which will not be described in detail here.

[0038] The third aspect of this utility model also provides an automobile, which includes the automobile wheel described in the above embodiments or the wheel hub bearing unit described in any of the above embodiments. It should be noted that the automobile described in this embodiment may also include, but is not limited to, conventional components and structures of existing automobiles such as engines, seats, suspensions, body, and interiors, which will not be described in detail here.

[0039] In the wheel hub bearing unit, automobile wheel, and automobile of this utility model, the wheel hub bearing unit adopts a multi-lip structure design, with a first main lip and a first secondary lip arranged axially opposite to each other. The first main lip and the first secondary lip are arranged opposite to each other and both fit against the first inner skeleton, which can not only achieve dust prevention but also prevent pressure leakage through the first secondary lip of the first seal, thus preventing the leakage of lubricating grease in the first bearing. Multiple lip structures are arranged sequentially to form a multi-layer sealing barrier. This design not only improves the sealing performance but also extends the service life of the seal to a certain extent. Through the optimization of multiple structures, the wheel hub bearing can achieve the goal of lifelong maintenance-free operation. This improves the technical problem of the imperfect sealing system of existing wheel hub bearing units, which easily leads to oil leakage and affects the bearing life. Therefore, this utility model effectively overcomes some practical problems in the prior art and has high utilization value and significance.

[0040] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A hub bearing unit, characterized in that, include: A first bearing is sandwiched between a hub housing and a rotating shaft, and the first bearing includes a first inner ring; The first sealing element includes a first inner skeleton and a first support body; the first inner skeleton surrounds and overlaps one end of the first inner ring; the first support body is sandwiched between the hub shell and the first inner skeleton, and seals the hub shell and one end of the first bearing. The first support includes a first main lip and a first secondary lip arranged opposite each other along the axial direction, with the first main lip and the first secondary lip respectively abutting against the first inner skeleton.

2. The hub bearing unit according to claim 1, characterized in that, The hub bearing unit also includes: The second bearing is sandwiched between the hub shell and the shaft, and is coaxially arranged with the first bearing; the second bearing includes a second inner ring. The second sealing element includes a second inner skeleton and a second support body; the second inner skeleton surrounds and overlaps one end of the second inner ring; the second support body is sandwiched between the hub shell and the first inner skeleton, and seals the hub shell and one end of the second bearing. The second support includes a second main lip and a second secondary lip arranged opposite each other along the axial direction, with the second main lip and the second secondary lip respectively abutting against the second inner skeleton.

3. The hub bearing unit according to claim 2, characterized in that, A sealing cavity is formed between the first bearing and the second bearing; a first pressure relief valve is provided on the hub housing, and the first pressure relief valve connects the sealing cavity to the outside of the sealing cavity; a second pressure relief valve is provided on the first inner ring and / or the second inner ring, and the second pressure relief valve connects the outside of the sealing cavity to the sealing cavity.

4. The hub bearing unit according to claim 3, characterized in that, The first pressure relief valve and the second pressure relief valve are one-way valves.

5. The hub bearing unit according to claim 1, characterized in that, The first internal skeleton includes: The first overlapping portion surrounds and overlaps the outer periphery of the first inner ring; the first overlapping portion is coaxially arranged with the rotating shaft; A plurality of first fitting portions are arranged around one end of the first overlapping portion; a plurality of sets of first fitting portions engage with the first inner ring.

6. The hub bearing unit according to claim 5, characterized in that, The surface roughness of the first inner skeleton that abuts the first main lip and the first secondary lip is Ra, where Ra≤0.04μm.

7. The hub bearing unit according to claim 5, characterized in that, The first inner skeleton is made of nylon.

8. The hub bearing unit according to claim 5, characterized in that, The first inner frame also includes a first extension, which is disposed at the end of the first overlapping portion opposite to the first secondary lip, and the first extension overlaps and connects to the rotating shaft.

9. A type of automobile wheel, characterized in that, Includes the hub bearing unit as described in any one of claims 1 to 8.

10. A car, characterized in that, Including the automobile wheel as described in claim 9.

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