Hub bearing

Abstract

The utility model provides a hub bearing which comprises an outer ring, an inner ring, a first sealing piece, a second sealing piece and a plurality of rollers, a raceway for the rollers to roll is formed between the outer ring and the inner ring, the inner ring comprises a flange part, the first sealing piece comprises a first sealing lip, a second sealing lip and a third sealing lip, and the second sealing piece comprises a second sealing lip and a third sealing lip. An arc-shaped corner is formed in the position, corresponding to the flange part, of the inner ring, the first sealing lip, the second sealing lip and the third sealing lip elastically abut against the arc-shaped corner, the second sealing piece comprises a sealing ring and a check ring, and the sealing ring is sequentially provided with a first lip part, a second lip part, a third lip part and a fourth lip part in the direction towards the inner ring. The first lip part and the third lip part are in clearance fit with the check ring, and the second lip part and the fourth lip part elastically abut against the check ring. Aiming at the defects in the prior art, the utility model provides the hub bearing which can effectively reduce the friction torque by improving the sealing structure on the premise of ensuring the sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing field especially a wheel hub bearing. BACKGROUND

[0002] Bearing plays the role of support and rotation in mechanical transmission, and the wheel hub bearing is a kind of bearing used on vehicle, and the friction torque directly influences the energy consumption of vehicle in the process of operation of bearing, and the wheel hub bearing is usually the bearing with sealing structure, and the friction torque between sealing ring and sleeve ring is particularly significant to its performance, and with the popularity of new energy vehicles, the requirement of friction torque of bearing is higher and higher, but the prior art usually sets multilayer contact type sealing to ensure sealing effect, which leads to larger friction torque and influences the performance of product. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a wheel hub bearing capable of effectively reducing friction torque under the premise of ensuring sealing by improving sealing structure.

[0004] To achieve the above object, the utility model provides a wheel hub bearing, which comprises an outer ring, an inner ring, a first sealing piece, a second sealing piece and a plurality of rollers, a rolling groove for the plurality of rollers to roll is formed between the outer ring and the inner ring, the inner ring comprises a flange part, the first sealing piece is arranged at one side of the inner ring flange part corresponding to the rolling groove, the second sealing piece is arranged at the other side of the rolling groove, the first sealing piece comprises a first sealing lip, a second sealing lip and a third sealing lip, an arc-shaped corner is formed at the position of the inner ring corresponding to the flange part, the first sealing lip, the second sealing lip and the third sealing lip are elastically abutted against the position of the inner ring corresponding to the arc-shaped corner, the second sealing piece comprises a sealing ring and a retaining ring, the sealing ring is sequentially provided with a first lip part, a second lip part, a third lip part and a fourth lip part in the direction of the inner ring, the first lip part and the third lip part are gap-fitted with the retaining ring, and the second lip part and the fourth lip part are elastically abutted against the retaining ring.

[0005] The advantages of the above technical scheme are that: by arranging the first sealing lip, the second sealing lip and the third sealing lip on the first sealing element, and the arc-shaped corner corresponding to the flange part position of the inner ring, the three sealing lips are elastically abutted at the arc-shaped corner, on the one hand, a multi-stage sealing structure is formed by the multiple sealing lips to ensure the sealing effect, and on the other hand, the three sealing lips can be arranged at different angles to cooperate with the inner ring to form a smooth contact, and a large friction torque is not generated due to excessive extrusion of the inner ring; the first lip and the third lip arranged on the second sealing ring in a gap cooperation do not generate an extra friction force due to over-tight cooperation between the hub and the retainer during rotation of the hub, and the friction torque is greatly reduced, and the second lip and the fourth lip elastically abutted can prevent impurities from entering to a certain extent to ensure the sealing effect, and the abutting force of the elastic abutment is optimized and designed, so that a large friction force is not generated like over-tight rigid connection, a good balance between sealing and reducing friction torque is achieved, and the multi-layer sealing lip arrangement can also ensure the reliability of the sealing.

[0006] The first sealing lip and the second sealing lip can be further arranged to extend in a direction away from the bearing axis, the first sealing lip is elastically abutted on a wall surface extending in a radial direction above the arc-shaped corner, and the second sealing lip is elastically abutted at the middle part of the arc-shaped corner.

[0007] By further arranging the first sealing lip elastically abutted on the wall surface extending in a radial direction above the arc-shaped corner and the second sealing lip elastically abutted at the middle part of the arc-shaped corner, compared with a complete planar contact, the non-planar elastic abutment mode can make the contact stress distribution of the sealing lip and the inner ring more uniform, and the uniform contact stress can avoid excessive friction generated by local stress concentration during rotation of the bearing, thereby effectively reducing the friction torque.

[0008] The third sealing lip can be further arranged to extend in a direction opposite to the second sealing lip, and the third sealing lip is abutted on a wall surface extending in an axial direction.

[0009] By further arranging the third sealing lip extending in a direction opposite to the second sealing lip, the first sealing lip and the second sealing lip form a multi-directional and multi-level sealing structure, the multi-angle sealing layout can more comprehensively prevent impurities from entering the bearing from different directions, and can better prevent internal grease from leaking, further strengthens the sealing effect, and ensures that the raceway and the roller and other components are in a good working environment.

[0010] The utility model discloses further can set up: the radial extension of the baffle ring is provided with the sheltering part, the baffle ring is sheltered in the outer side of sealing washer and is cooperated with the gap, the sheltering part is provided with the bending part that extends to the sealing washer direction, first lip portion is inclined extension setting towards the bending part, and the gap cooperation is between first lip portion and the bending part.

[0011] Further setting, on the basis of guaranteeing the basic sealing effect of the sheltering part, the bending part extending to the sealing washer direction is arranged, further increasing the level of sealing, the existence of the bending part makes the sealing path more complex, prolongs the path of medium penetration, thereby improve the reliability of sealing, the gap cooperation avoids the direct rigid contact and friction between the first lip portion and the bending part, and the setting of the first lip portion can reduce the energy loss and wear caused by friction, under the premise of guaranteeing the sealing effect, effectively reduce the friction torque, improve the service life and operating efficiency of the component.

[0012] The utility model discloses further can set up: the second lip portion is inclined extension setting towards the direction of far away from bearing axis, and the second lip portion interference abuts in the lower place of the corresponding bending part of sheltering part.

[0013] Further setting, the second lip portion interference abuts in the lower place of the corresponding bending part of sheltering part, and the interference fit can ensure that the lip portion and the sheltering part are closely attached, effectively block the entry of external impurities, liquid and the like into the sealing area, and ensure good sealing performance, at the same time, the abutment at the lower place of the bending part further enhances the sealing effect by using the structure of the bending part, making the sealing path more complex and improving the reliability of sealing, which can also play a greater role in preventing leakage.

[0014] The utility model discloses further can set up: the third lip portion is inclined extension towards the root direction of sheltering part and cooperates with the gap between the sheltering part, and the fourth lip portion is inclined extension towards the direction of roller and is elastically abutted on the baffle ring.

[0015] Further setting, the third lip portion and the fourth lip portion are arranged to form a multilayer sealing structure, which can have a superposition effect in ensuring sealing performance and can more effectively block the intrusion of external impurities and liquid, at the same time, since the design of each lip portion fully considers the factor of reducing the friction torque, the multilayer structure will not cause a substantial increase in the friction torque due to the increase in the number of layers when working, on the contrary, the mutual cooperation between the lip portions realizes a low friction torque under the premise of ensuring sealing, which improves the overall performance and operating stability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model discloses further can set up: the radial extension of the baffle ring is provided with the sheltering part, the baffle ring is sheltered in the outer side of sealing washer and is cooperated with the gap, the sheltering part is provided with the bending part that extends to the sealing washer direction, first lip portion is inclined extension setting towards the bending part, and the gap cooperation is between first lip portion and the bending part.

[0017] Figure 2 For the embodiment of the utility model Figure 1 The enlarged view of part a in the middle;

[0018] Figure 3 For the embodiment of the utility model Figure 1 The enlarged view of part b in the middle;

[0019] Wherein: outer ring 1, inner ring 2, flange part 21, arc corner 22, first sealing element 3, first sealing lip 31, second sealing lip 32, third sealing lip 33, second sealing element 4, sealing ring 41, retaining ring 42, shielding part 421, bending part 422, first lip part 43, second lip part 44, third lip part 45, fourth lip part 46, roller 5. Specific implementation

[0020] The embodiment of the utility model discloses a hub bearing, which comprises an outer ring 1, an inner ring 2, a first sealing element 3, a second sealing element 4 and a plurality of rollers 5. Figures 1-3 As shown in the figure: including outer ring 1, inner ring 2, first sealing element 3, second sealing element 4 and a plurality of rollers 5, the outer ring 1 and the inner ring 2 form a raceway for the rolling of the plurality of rollers 5, the inner ring 2 includes a flange part 21, the first sealing element 3 is arranged at one side of the raceway corresponding to the inner ring flange part 21, the second sealing element 4 is arranged at the other side of the raceway, the first sealing element 3 includes a first sealing lip 31, a second sealing lip 32 and a third sealing lip 33, the inner ring 2 forms an arc corner 22 at the position corresponding to the flange part 21, the first sealing lip 31, the second sealing lip 32 and the third sealing lip 33 are elastically abutted at the position of the arc corner 22 of the inner ring 2, the second sealing element 4 includes a sealing ring 41 and a retaining ring 42, the sealing ring 41 is sequentially provided with a first lip part 43, a second lip part 44, a third lip part 45 and a fourth lip part 46 in the direction of the inner ring 2, the first lip part 43 and the third lip part 45 are gap-fitted with the retaining ring 42, and the second lip part 44 and the fourth lip part 46 are elastically abutted with the retaining ring.

[0021] The first sealing lip 31 and the second sealing lip 32 extend obliquely in the direction away from the bearing axis, the first sealing lip 31 is elastically abutted on the radially extending wall surface above the arc corner 22, and the second sealing lip 32 is elastically abutted at the middle part of the arc corner 22.

[0022] The third sealing lip 33 is arranged to extend obliquely in the direction opposite to the second sealing lip 32, and the third sealing lip 33 is abutted at the axially extending wall surface below.

[0023] The blocking circle 42 is provided with a radially extending blocking part 421, the blocking circle 42 is blocked outside the sealing ring 41 and gap matched with the sealing ring 41 through the blocking part 421, the blocking part 421 is provided with a bending part 422 extending towards the sealing ring 41, the first lip part 43 is obliquely extended towards the bending part, and the first lip part 43 and the bending part 422 are gap matched.

[0024] The second lip part 44 is obliquely extended towards the direction away from the bearing axis, and the second lip part 44 is interference abutted below the corresponding bending part 422 of the blocking part 421.

[0025] The third lip part 45 is obliquely extended towards the root of the blocking part 421 and gap matched with the blocking part 421, and the fourth lip part 45 is obliquely extended towards the roller direction and elastically abutted on the blocking circle 42.

[0026] The above examples are only one of the preferred specific examples of the present application, and the usual changes and replacements made by the person skilled in the art within the technical scheme of the present application are all included in the protection scope of the present application.

Claims

1. A wheel hub bearing comprising an outer ring, an inner ring, a first seal, a second seal and a plurality of rollers, a raceway for the plurality of rollers being formed between the outer ring and the inner ring, the inner ring comprising a flange portion, the first seal being disposed at a side of the raceway corresponding to the flange portion of the inner ring, the second seal being disposed at the other side of the raceway, characterized in that: The first seal comprises a first sealing lip, a second sealing lip and a third sealing lip, the inner ring is formed with an arc-shaped corner at a position corresponding to the flange part, the first sealing lip, the second sealing lip and the third sealing lip are elastically abutted against positions of the arc-shaped corner of the inner ring, the second seal comprises a sealing ring and a retaining ring, the sealing ring is sequentially provided with a first lip part, a second lip part, a third lip part and a fourth lip part in the direction of the inner ring, the first lip part and the third lip part are gap-fitted with the retaining ring, and the second lip part and the fourth lip part are elastically abutted against the retaining ring.

2. The hub bearing according to claim 1, characterized in that: The first sealing lip and the second sealing lip are inclinedly extended in a direction away from the bearing axis, the first sealing lip is elastically abutted against a wall surface extending radially above the arc-shaped corner, and the second sealing lip is elastically abutted against a middle part of the arc-shaped corner.

3. The hub bearing of claim 2, wherein: The third sealing lip is inclinedly extended in a direction opposite to the second sealing lip, and the third sealing lip is abutted against a wall surface extending axially below.

4. Hub bearing according to claim 1 or 2 or 3, characterized in that: The retaining ring is provided with a radially extending shielding part, the retaining ring is shielded outside the sealing ring through the shielding part and gap-fitted with the sealing ring, the shielding part is provided with a bending part extending in the direction of the sealing ring, the first lip part is inclinedly extended in the direction of the bending part, and the first lip part is gap-fitted with the bending part.

5. The hub bearing of claim 4, wherein: The second lip part is inclinedly extended in a direction away from the bearing axis, and the second lip part is abutted against below the shielding part corresponding to the bending part in a manner of interference.

6. The hub bearing of claim 5, wherein: The third lip part is inclinedly extended in the direction of the root of the shielding part and gap-fitted with the shielding part, and the fourth lip part is inclinedly extended in the direction of the roller and elastically abutted against the retaining ring.

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