Hub bearing

Abstract

The utility model provides a hub bearing, and particularly relates to the field of bearings. The hub bearing comprises a hub shell and a bearing body installed in the hub shell, the bearing body comprises a bearing inner ring and a bearing outer ring, and a step for positioning the bearing outer ring is arranged on the hub shell. The hub bearing further comprises a first sealing piece and a second sealing piece, the first sealing piece is fixedly connected with the step, and the first sealing piece and the bearing are coaxially arranged. The second sealing piece is fixed with the inner ring of the bearing and is coaxially arranged with the bearing; the first sealing piece and the second sealing piece form a labyrinth sealing structure used for preventing lubricating grease from flowing out of the bearing. When the hub bearing is used, the filling amount of the lubricating grease is reduced, the utilization rate of the lubricating grease can be increased, the maintenance time of a vehicle is prolonged, and the whole hidden danger can be effectively reduced.

Description

Technical Field

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

[0002] The wheel hub bearing is a part that connects the tire, brake disc and steering knuckle. Its main function is to reduce friction for the rotating pair and also transmit torque. The wheel hub bearing can not only bear axial load but also radial load. The inner ring of the automobile wheel hub bearing is mainly connected to the half shaft, and the outer ring of the bearing is connected to the wheel hub shell.

[0003] In order to improve the performance of the bearing and extend its service life, grease needs to be injected into the wheel hub bearing before use. The commonly used grease filling method is to fill the wheel hub shell cavity with grease, and further fill the bearing installed in the wheel hub shell with grease. This filling method has the following problems: a large amount of grease filling can easily lead to poor heat dissipation of the bearing, increased resistance, increased temperature, and accelerated grease deterioration; the grease expands due to heat and easily squeezes the oil seal. Furthermore, the grease that flows out flows onto the brake shoe, causing brake failure and accidents. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the utility model provides a wheel hub bearing to improve the problem of excessive grease filling and potential safety hazards.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a wheel hub bearing, the wheel hub bearing comprises a wheel hub shell and a bearing installed in the wheel hub shell, the bearing comprises a bearing inner ring and a bearing outer ring, and the wheel hub shell is provided with a step for positioning the bearing outer ring. The wheel hub bearing also comprises a first seal and a second seal, the first seal is fixedly connected to the step and is coaxially arranged with the bearing; the second seal is fixed to the bearing inner ring and is coaxially arranged with the bearing; wherein the first seal and the second seal form a labyrinth seal structure for preventing grease from flowing out of the bearing.

[0006] In an example of the present invention, the first sealing member includes a sealing plate and a first fixing portion fixedly connected to the step, the sealing plate and the first fixing portion are both annular shapes coaxially arranged with the bearing, and the inner periphery of the first fixing portion is fixedly connected to the outer periphery of the sealing plate.

[0007] In an example of the present invention, the second sealing member includes a first sealing portion and a second sealing portion, the first sealing portion extends along the axial direction of the bearing inner ring and is circumferentially distributed along the central axis of the bearing inner ring, the second sealing portion is a circular ring coaxially arranged with the first sealing portion, one end of the first sealing portion is fixedly connected to the bearing inner ring, and the other end of the first sealing portion is fixedly connected to the inner periphery of the second sealing portion.

[0008] In an example of the present invention, a sealing cavity is provided on the second sealing portion, an opening is provided at one end of the sealing cavity away from the first sealing portion, the sealing sheet extends into the sealing cavity through the opening and forms the labyrinth sealing structure with the sealing cavity.

[0009] In an example of the present invention, a second fixing portion fixedly connected to the bearing inner ring is provided at one end of the first sealing portion close to the bearing inner ring, and the fixing portion extends along the end surface of the bearing inner ring.

[0010] In an example of the present invention, the first sealing member is detachably connected to the step, and the fixing portion is detachably connected to the bearing inner ring.

[0011] In an example of the present invention, the material of the first sealing member and the second sealing member is 65Mn spring steel.

[0012] In an example of the present invention, a first rib and a second rib are provided on the inner ring of the bearing, and the first rib and the second rib are respectively located at two ends of the inner ring of the bearing.

[0013] In an example of the present invention, the first rib and the second rib are integrally formed with the bearing inner ring.

[0014] In an example of the present invention, avoidance grooves are provided on the inner sides of the first rib and the second rib of the bearing inner ring, the avoidance grooves are arc surfaces, and the avoidance grooves are distributed circumferentially around the bearing inner ring.

[0015] The wheel hub bearing provided by the utility model seals the grease in the bearing through the labyrinth seal structure formed by the first seal and the second seal, thereby reducing the leakage of the grease into the cavity of the wheel hub shell. The wheel hub bearing of the present application does not need to inject grease into the entire cavity of the wheel hub shell, thus reducing the filling amount of the grease, which can not only improve the utilization rate of the grease, extend the maintenance of the vehicle, but also effectively reduce the overall hidden dangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a schematic diagram of the installation of the hub bearing of the utility model in one embodiment;

[0018] Figure 2 for Figure 1 A partial enlarged schematic diagram of area A in the middle.

[0019] 100, wheel hub shell; 110, step; 200, bearing; 210, bearing inner ring; 211, first rib; 212, second rib; 213, avoidance groove; 220, bearing outer ring; 230, rolling element; 300, first sealing member; 310, sealing sheet; 320, first fixing part; 400, second sealing member; 410, first sealing part; 411, second fixing part; 420, second sealing part; 421, sealing cavity. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] See also Figure 1 and Figure 2The utility model provides a wheel hub bearing, which includes a wheel hub shell 100 and a bearing 200 installed in the wheel hub shell 100, wherein the bearing 200 includes a bearing inner ring 210 and a bearing outer ring 220, and the wheel hub shell 100 is provided with a step 110 for positioning the bearing outer ring 220. In order to improve the performance of the wheel hub bearing and extend its service life, grease needs to be injected into the wheel hub bearing before use. However, excessive grease injection may easily lead to poor heat dissipation of the bearing 200, and even grease leakage to the brake pad may cause brake failure and cause an accident. Therefore, the present application sets a sealing assembly in the wheel hub bearing, and injects grease between the bearing 200 and the sealing assembly to ensure the good operation of the bearing 200. There is no need to inject grease into the entire cavity of the wheel hub shell 100, thereby reducing the filling amount of grease and effectively reducing safety hazards.

[0023] The above-mentioned sealing assembly includes a first seal 300 and a second seal 400. The first seal 300 is fixedly connected to the step 110, and the first seal 300 is coaxially arranged with the bearing 200; the second seal 400 is fixed to the bearing inner ring 210, and the second seal 400 is coaxially arranged with the bearing 200; the first seal 300 and the second seal 400 form a labyrinth sealing structure for preventing grease from flowing out of the bearing 200.

[0024] See also Figure 1 and Figure 2The first sealing member 300 includes a sealing sheet 310 and a first fixing portion 320 fixedly connected to the step 110. The sealing sheet 310 and the first fixing portion 320 are both annular in shape and coaxially arranged with the bearing 200. The inner periphery of the first fixing portion 320 is fixedly connected to the outer periphery of the sealing sheet 310. The second sealing member 400 includes a first sealing portion 410 and a second sealing portion 420. The first sealing portion 410 extends along the axial direction of the bearing inner ring 210 and is circumferentially distributed along the central axis of the bearing inner ring 210. The second sealing portion 420 is annular in shape and coaxially arranged with the sealing sheet 310. One end of the first sealing portion 410 is fixedly connected to the bearing inner ring 210, and the other end of the first sealing portion 410 is fixedly connected to the inner periphery of the second sealing portion 420. The second sealing part 420 is provided with a sealing cavity 421, and an opening is provided at one end of the sealing cavity 421 away from the first sealing part 410. The sealing sheet 310 extends into the sealing cavity 421 through the opening and forms a labyrinth sealing structure with the sealing cavity 421. During operation, the first sealing member 300 is in a stationary state, and the second sealing member 400 rotates synchronously with the bearing inner ring 210. The sealing sheet 310 and the sealing cavity 421 rotate relative to each other. The grease enters the sealing cavity 421 from the side close to the bearing 200, and is blocked by the sealing sheet 310 in the sealing cavity 421 to the side of the sealing cavity 421 away from the bearing 200. The sealing sheet 310 effectively blocks the flow of the grease and reduces the leakage of the grease. The sizes of the first sealing member 300 and the second sealing member 400 are not limited here, and are adjusted according to the use requirements.

[0025] Preferably, the first sealing portion 410 is provided with a second fixing portion 411 fixedly connected to the bearing inner ring 210 at one end thereof close to the bearing inner ring 210, and the second fixing portion 411 extends along the end surface of the bearing inner ring 210, which is conducive to increasing the contact area between the second fixing portion 411 and the bearing inner ring 210 and enhancing the stability of the second sealing member 400. The first sealing portion 410 and the second sealing portion 420 can be fixedly connected by any means, such as welding or integral molding. In this embodiment, the first sealing portion 410 and the second sealing portion 420 are integrally molded.

[0026] See also Figure 1 and Figure 2In this application, there is no restriction on the materials of the first seal 300 and the second seal 400. The first seal 300 and the second seal 400 only need to have good oil resistance. In one embodiment, the material of the first seal 300 and the second seal 400 is preferably 65Mn spring steel. 65Mn spring steel not only has good oxidation resistance and corrosion resistance, but also has certain flexibility and plasticity. When grease is not injected, the first seal 300 and the second seal 400 are in a straight state. As the amount of grease injected increases, the first seal 300 and the second seal 400 are deformed. The first seal 300 and the second seal 400 are bent toward the cavity side of the wheel hub shell 100 (as shown by the dotted line in the figure), and the distance between the sealing sheet 310 and the sealing cavity 421 is reduced. The grease in the sealing cavity 421 can reduce the friction between the sealing sheet 310 and the sealing cavity 421 due to its own deformation. As the wheel hub bearing runs, the grease is continuously consumed, and the first seal 300 and the second seal 400 gradually restore their initial state under the action of their own elasticity. In this process, under the action of the first seal 300 and the second seal 400, the grease of the bearing 200 can be automatically compensated.

[0027] In the present application, there is no restriction on the fixing method of the first seal 300 and the step 110, and there is no restriction on the fixing method of the second seal 400 and the bearing inner ring 210, and the fixing methods include but are not limited to riveting, welding and detachable connection. In this embodiment, the first seal 300 is detachably connected to the step 110, and the second seal 400 is detachably connected to the bearing inner ring 210. As the use time of the wheel hub bearing increases, the flexibility of the first seal 300 and the second seal 400 deteriorates, which facilitates the replacement of the first seal 300 and the second seal 400.

[0028] See also Figure 1 The bearing 200 further includes a rolling body 230, and the bearing outer ring 220 is rotatably connected to the bearing inner ring 210 through the rolling body 230. In one embodiment, the bearing inner ring 210 is provided with a first rib 211 and a second rib 212, which are respectively located at two ends of the bearing inner ring 210, and are used to support and guide the rolling body 230 and keep it in the bearing 200. The first rib 211 and the second rib 212 can be fixedly connected with the bearing inner ring 210 in any manner, such as welding or integral molding, and the first rib 211 and the second rib 212 are integrally molded with the bearing inner ring 210. Preferably, the bearing inner ring 210 is provided with an avoidance groove 213 on the inner side of the first rib 211 and the second rib 212, and the avoidance groove 213 is an arc surface, and the avoidance groove 213 is distributed around the circumference of the bearing inner ring 210, which is convenient for processing the bearing inner ring 210, and can also be used to store lubricating substances when in use.

[0029] The wheel hub bearing provided by the utility model seals the grease in the bearing through the labyrinth seal structure formed by the first seal and the second seal, thereby reducing the leakage of the grease into the cavity of the wheel hub shell. The wheel hub bearing of the present application does not need to inject grease into the entire cavity of the wheel hub shell, which reduces the filling amount of grease, can not only improve the utilization rate of grease, extend the maintenance of the vehicle, but also effectively reduce all hidden dangers. Therefore, the utility model effectively overcomes some practical problems in the prior art and has a high utilization value and use significance.

[0030] 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, comprising a wheel hub shell and a bearing installed in the wheel hub shell, the bearing comprising a bearing inner ring and a bearing outer ring, the wheel hub shell being provided with a step for positioning the bearing outer ring, It is characterized in that Also includes: A first sealing member, fixedly connected to the step and coaxially arranged with the bearing; A second sealing member is fixed to the inner ring of the bearing and is coaxially arranged with the bearing; The first seal and the second seal form a labyrinth seal structure for preventing grease from flowing out of the bearing.

2. The wheel hub bearing according to claim 1, It is characterized in that The first sealing member includes a sealing sheet and a first fixing portion fixedly connected to the step. The sealing sheet and the first fixing portion are both annular shapes coaxially arranged with the bearing. The inner periphery of the first fixing portion is fixedly connected to the outer periphery of the sealing sheet.

3. The wheel hub bearing according to claim 2, It is characterized in that The second sealing member includes a first sealing portion and a second sealing portion, wherein the first sealing portion extends along the axial direction of the bearing inner ring and is circumferentially distributed along the central axis of the bearing inner ring, and the second sealing portion is a circular ring coaxially arranged with the first sealing portion, one end of the first sealing portion is fixedly connected to the bearing inner ring, and the other end of the first sealing portion is fixedly connected to the inner periphery of the second sealing portion.

4. The wheel hub bearing according to claim 3, It is characterized in that A sealing cavity is provided on the second sealing portion, and an opening is provided at one end of the sealing cavity away from the first sealing portion. The sealing sheet extends into the sealing cavity through the opening and forms the labyrinth sealing structure with the sealing cavity.

5. The wheel hub bearing according to claim 4, It is characterized in that A second fixing portion fixedly connected to the bearing inner ring is disposed at one end of the first sealing portion close to the bearing inner ring, and the fixing portion extends along the end surface of the bearing inner ring.

6. The wheel hub bearing according to claim 5, It is characterized in that The first sealing member is detachably connected to the step, and the fixing portion is detachably connected to the bearing inner ring.

7. The wheel hub bearing according to claim 1, It is characterized in that The first sealing member and the second sealing member are made of 65Mn spring steel.

8. The wheel hub bearing according to claim 1, It is characterized in that The bearing inner ring is provided with a first rib and a second rib, and the first rib and the second rib are respectively located at two ends of the bearing inner ring.

9. The wheel hub bearing according to claim 8, It is characterized in that The first rib and the second rib are integrally formed with the bearing inner ring.

10. The wheel hub bearing according to claim 8, It is characterized in that The inner ring of the bearing is provided with avoidance grooves on the inner sides of the first rib and the second rib. The avoidance grooves are arc surfaces and are distributed around the circumference of the inner ring of the bearing.

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