Hub bearing

Abstract

The utility model discloses a hub bearing which comprises an outer ring and an inner ring, a flange plate is connected to the inner ring, a connecting groove is formed in the inner ring, a connecting ring is arranged on the connecting groove in a matched mode, and rolling bodies are arranged between the outer ring and the inner ring and between the outer ring and the connecting ring respectively. A first sealing piece is arranged at the end, close to the flange plate, of the outer ring, a second sealing piece is arranged at the end, away from the flange plate, of the outer ring, one end of the first sealing piece is connected to the inner wall of the outer ring, the other end of the first sealing piece extends towards the inner ring, the first sealing piece is wrapped by a first sealing lip, and a sealing step is formed on the inner ring. A gap is formed between the outer edge of the sealing step and the edge of the outer ring, a plurality of sealing grooves are formed in the side wall of the sealing step, and the first sealing lip extends into the sealing grooves to form a first blocking lip. The sealing device is simple in structure, better in sealing effect, more stable in sealing structure and capable of avoiding early failure of a sealing part.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hub bearings. BACKGROUND

[0002] Hub bearing is one of the key components of automobile, its main role is to bear weight and provide accurate guidance for the rotation of hub. It requires that axial and radial loads can be simultaneously borne. The existing third generation hub bearing generally includes outer ring, inner ring with flange, rolling body and sealing element. Two different sealing elements are usually installed on the third generation hub bearing, including first sealing element and second sealing element. The second sealing element is located on the side of the first sealing element away from the flange. If the sealing performance of the third generation hub bearing is not good, internal lubricating grease leakage, external moisture, dust and other pollutants will invade the bearing in actual use. Make the bearing appear abnormal sound, wear and tear and other problems, affect its service life, and cause the car to lose control in serious cases. Therefore, to ensure the actual service life of the bearing, excellent bearing sealing capacity is required. The existing third generation hub bearing has the following problems: the gap between the opposite faces of the outer ring and the flange is generally 1-2mm, the gap is large, and when the wheel is subjected to abnormal impact (such as mountain road, road shoulder), the rotating part is inclined to one side due to uneven force, so that the sealing element is subjected to uneven force, and local wear and tear is aggravated, which easily causes early failure of the sealing element. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides a kind of hub bearings, it is simple in structure, with better sealing effect, and the sealing structure is more stable, avoid early failure of sealing element, prolong its service life.

[0004] To achieve the above object, the utility model provides a kind of hub bearings, including outer ring and inner ring, the inner ring is connected with flange, the inner ring is formed with connecting groove, the connecting groove is matched with connecting ring, the outer ring and inner ring and the outer ring and connecting ring are respectively provided with rolling body, the outer ring is provided with first sealing element in the end close to flange, the outer ring is provided with second sealing element in the end away from flange, the first sealing element includes one end connection in outer ring inner wall, the other end extends and is provided to inner ring, the first sealing element is covered with first sealing lip, the inner ring is formed with sealing step in the position corresponding to first sealing element, the gap is formed between the outer edge of sealing step and the edge of outer ring, a plurality of sealing grooves are formed on the side wall of sealing step, and the first sealing lip extends first blocking lip in sealing groove.

[0005] The beneficial effect of such an arrangement is that the overall structure does not affect the normal operation of the patent, and when the wheel is subjected to abnormal impact (such as a mountain road, a shoulder), the flange can effectively support the outer ring, offset the abnormal impact force, and prevent the local wear of the sealing element from accelerating to cause early failure of the sealing element. As a preferred embodiment, a pull key can be arranged on the inner wall of the inner ring, which can effectively transmit torque and improve the transmission efficiency of the bearing. Further, the sealing step at the corresponding position of the inner ring and the gap formed by the outer edge of the outer ring seem simple, but in fact have hidden mechanisms. When the wheel hub encounters complex driving environments, such as mud, dust and other pollutants, the first sealing lip can effectively block external impurities from entering, and the sealing grooves on the side wall of the sealing step cooperate with the first blocking lip extending therefrom. This design not only enhances the stability of the seal, but also effectively prevents internal lubricating grease from leaking. The stable retention of lubricating grease is crucial to the normal operation of the rolling element. When the wheel hub rotates at high speed, if the grease leaks, the rolling element will be severely worn due to lack of lubrication, thereby affecting the service life and safety of the entire bearing. The second sealing element is located at the end of the outer ring away from the flange, and cooperates with the first sealing element to form a double protection. This double sealing structure enables the wheel hub bearing to maintain good sealing performance in various harsh working conditions, ensuring smooth operation of the bearing and prolonging the overall service life of the wheel hub bearing.

[0006] As a further arrangement of the present utility model, the first sealing lip extends a second blocking lip towards the side wall of the sealing step, and the first sealing lip further has a third blocking lip arranged at the end close to the inner ring, and the third blocking lip abuts against the outer peripheral wall of the inner ring.

[0007] The beneficial effect of such an arrangement is that the second blocking lip extending from the first sealing lip closely cooperates with the side wall of the sealing step, further reducing the sealing gap. When external fine particles attempt to enter the bearing interior through the sealing gap, the second blocking lip can effectively block them. Meanwhile, the third blocking lip arranged at the end of the first sealing lip close to the inner ring directly abuts against the outer peripheral wall of the inner ring, which not only effectively prevents the lubricating grease from leaking along the inner ring wall, but also resists the intrusion of impurities. During vehicle driving, whether it is sand and dust raised on the road surface or mud splashed due to wading, these impurities are difficult to break through and enter the bearing interior. The second blocking lip and the third blocking lip cooperate with the first blocking lip to strengthen the seal from different angles and positions, greatly improving the reliability of the seal and providing a more solid guarantee for the stable operation of the wheel hub bearing, ensuring that the bearing can still maintain good working condition in complex and harsh working conditions.

[0008] As a further setting of the utility model, the third sealing piece is arranged on the connecting ring corresponding to the position of the second sealing piece, the second sealing piece comprises a first longitudinal part and a first horizontal part connected with each other, the third sealing piece comprises a second longitudinal part and a second horizontal part connected with each other, the first longitudinal part and the first horizontal part and the second longitudinal part and the second horizontal part are combined into L shape respectively, the first horizontal part is connected on the inner wall of the outer ring, the second horizontal part is connected on the outer peripheral wall of the connecting ring, the first longitudinal part end and the second horizontal part and the second longitudinal part end and the first horizontal part form a gap respectively, and the first longitudinal part is arranged closer to the rolling body than the second longitudinal part.

[0009] The beneficial effect of the arrangement is that the arrangement makes the sealing structure closely fit the key parts of the wheel hub bearing, and the second sealing piece and the third sealing piece combine to form a dustproof labyrinth, so that when the external dust, mud and other pollutants attempt to invade the bearing interior, they need to pass through the crisscrossed gaps to enter the bearing interior, thereby increasing the difficulty of the external pollutants entering.

[0010] As a further setting of the utility model, the first longitudinal part is covered with a second sealing lip, and the second sealing lip comprises a fourth blocking lip abutting against the second longitudinal part and a fifth blocking lip abutting against the second horizontal part.

[0011] The beneficial effect of the arrangement is that the fourth blocking lip abuts against the second longitudinal part, effectively filling the possible gap and preventing the pollutants from invading in the longitudinal direction. The fifth blocking lip closely abuts against the second horizontal part, thereby eliminating the entry channel of impurities in the horizontal direction. During the driving of the vehicle, neither the splashed mud nor the raised dust can break through the two lines of defense. The two blocking lips cooperate with each other to form a more rigorous sealing barrier, greatly reducing the risk of pollutants entering the bearing interior, ensuring that the bearing is always in a good working environment, and ensuring the stable operation of the wheel hub bearing.

[0012] As a further setting of the utility model, the second longitudinal part free end extends in the direction of the rolling body and has a first folded edge, and the second horizontal part free end extends in the direction of the outer ring and has a second folded edge.

[0013] The beneficial effect of the arrangement is that the first folded edge can effectively block the dust raised from the rolling body direction, avoid its entry into the bearing interior, and reduce the abrasion of impurities to the rolling body. The second folded edge extends in the direction of the outer ring, preventing the lubricating grease from seeping along the gap between the connecting ring and the outer ring. During the driving of the vehicle, the dust and vibration generated by the complex road conditions can affect the bearing, and the two folded edges cooperate with each other to strengthen the sealing from the edge, ensure the stable operation of the bearing, and prolong the service life of the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1The whole structure schematic view of the embodiment of the utility model;

[0015] Figure 2 The embodiment of the utility model Figure 1 The partial enlarged view of A part in the middle;

[0016] Figure 3 The embodiment of the utility model Figure 1 The partial enlarged view of B part in the middle. Specific implementation

[0017] The utility model provides a kind of embodiment of wheel hub bearing, such as Figures 1 to 3As shown, including the outer ring 2 and the inner ring 1, the flange plate 11 is connected to the inner ring 1, the connecting groove is formed on the inner ring 1, the connecting ring 3 is matched on the connecting groove, the rolling body 4 is arranged between the outer ring 2 and the inner ring 1 and between the outer ring 2 and the connecting ring 3 respectively, the first sealing element 5 is arranged at one end of the outer ring 2 close to the flange plate 11, the second sealing element 7 is arranged at one end of the outer ring 2 away from the flange plate 11, the first sealing element 5 includes one end connected to the inner wall of the outer ring 2 and the other end extending towards the inner ring 1, the first sealing element 5 is wrapped with the first sealing lip, the sealing step 12 is formed on the inner ring 1 corresponding to the position of the first sealing element 5, the gap is formed between the outer edge of the sealing step 12 and the edge of the outer ring 2, a plurality of sealing grooves 13 are arranged on the side wall of the sealing step 12, and the first blocking lip 61 extends into the sealing groove 13 from the first sealing lip. The beneficial effects of such a setting are: such a setting does not affect the normal operation of the patent, and when the wheel is subjected to abnormal impact (such as mountain roads, road shoulders), the flange plate 11 can effectively support the outer ring 2 to offset the abnormal impact force and prevent the local wear of the sealing element from aggravating to cause early failure of the sealing element. As a preferred embodiment, a pull key can be arranged on the inner wall of the inner ring 1 to effectively transmit torque and improve the transmission efficiency of the bearing. Further, the sealing step 12 corresponding to the position of the inner ring 1 and the gap formed between the edge of the outer ring 2 are seemingly simple but actually have hidden tricks. When the hub is in a complex driving environment, such as encountering mud, dust and other pollutants, the first sealing lip can effectively block the foreign matter from entering, and the plurality of sealing grooves 13 on the side wall of the sealing step 12 cooperate with the first blocking lip 61 extending into the first sealing lip. This design not only enhances the stability of the sealing, but also effectively prevents the leakage of internal lubricating grease. The stable retention of lubricating grease is the key to ensuring the normal operation of the rolling body 4. When the hub rotates at high speed, if the grease leaks, the rolling body 4 will be severely worn due to lack of lubrication, thereby affecting the service life and safety of the entire bearing. The second sealing element 7 is located at one end of the outer ring 2 away from the flange plate 11 and cooperates with the first sealing element 5 to form a double protection. Such a double sealing structure enables the hub bearing to maintain good sealing performance in various harsh working conditions, ensures smooth operation of the bearing, and prolongs the overall service life of the hub bearing.

[0018] As a further arrangement of the present embodiment, the first sealing lip extends a second blocking lip 62 towards the side wall of the sealing step 12, and the first sealing lip is further provided with a third blocking lip 63 near one end of the inner ring 1, which abuts against the outer peripheral wall of the inner ring 1. The beneficial effect of such an arrangement is that the second blocking lip 62 extending from the first sealing lip closely cooperates with the side wall of the sealing step 12, further reducing the sealing gap. When external fine particles attempt to enter the bearing interior through the sealing gap, the second blocking lip 62 can effectively block them. At the same time, the third blocking lip 63 provided near one end of the first sealing lip abuts directly against the outer peripheral wall of the inner ring 1, which not only effectively prevents the leakage of lubricating grease along the wall of the inner ring 1, but also resists the intrusion of impurities. During vehicle driving, whether it is the sand and dust raised on the road surface or the mud splashed due to wading, these impurities are difficult to break through and enter the bearing interior. The second blocking lip 62 and the third blocking lip 63 cooperate with the first blocking lip 61 to strengthen the sealing from different angles and positions, greatly improving the reliability of the sealing, providing a more solid guarantee for the stable operation of the hub bearing, and ensuring that the bearing can still maintain a good working state under complex and harsh working conditions.

[0019] As a further arrangement of the present embodiment, the connecting ring 3 is provided with a third sealing member 8 corresponding to the position of the second sealing member 7, the second sealing member 7 comprises a first longitudinal part 71 and a first transverse part 72 connected together, the third sealing member 8 comprises a second longitudinal part 81 and a second transverse part 82 connected together, the first longitudinal part 71 and the first transverse part 72 and the second longitudinal part 81 and the second transverse part 82 are respectively combined into an L shape, the first transverse part 72 is connected to the inner wall of the outer ring 2, the second transverse part 82 is connected to the outer peripheral wall of the connecting ring 3, gaps are respectively formed between the end of the first longitudinal part 71 and the second transverse part 82 and between the end of the second longitudinal part 81 and the first transverse part 72, and the first longitudinal part 71 is arranged closer to the rolling element 4 than the second longitudinal part 81. The beneficial effect of such an arrangement is that such a layout makes the sealing structure closely fit the key parts of the hub bearing, and the second sealing member 7 and the third sealing member 8 are combined to form a dustproof labyrinth, when external dust, mud and other pollutants attempt to intrude into the bearing interior, they need to pass through the crisscross gaps to enter the bearing interior, increasing the difficulty of the external pollutants entering.

[0020] As a further arrangement of the present embodiment, the first longitudinal portion 71 is externally covered with a second sealing lip, which includes a fourth blocking lip 91 abutting against the second longitudinal portion 81 and a fifth blocking lip 92 abutting against the second transverse portion 82. The beneficial effect of such an arrangement is that the fourth blocking lip 91 abuts against the second longitudinal portion 81 tightly, effectively filling the gap that may exist and preventing contaminants from invading from the longitudinal direction. The fifth blocking lip 92 abuts against the second transverse portion 82 tightly, effectively blocking the path for contaminants from the transverse direction. During the driving of the vehicle, neither splashed mud nor raised dust can break through these two lines of defense. The two blocking lips cooperate with each other to form a more stringent sealing barrier, greatly reducing the risk of contaminants entering the bearing interior, ensuring that the bearing is always in a good working environment and ensuring the stable operation of the hub bearing.

[0021] As a further arrangement of the present embodiment, the second longitudinal portion 81 has a first folded edge 811 extending towards the rolling element 4 at the free end, and the second transverse portion 82 has a second folded edge 821 extending towards the outer ring 2 at the free end. The beneficial effect of such an arrangement is that the first folded edge 811 can effectively block the dust raised from the rolling element 4, preventing it from entering the bearing interior and reducing the wear of the rolling element 4 by impurities. The second folded edge 821 extends towards the outer ring 2, preventing the lubricating grease from seeping along the gap between the connecting ring 3 and the outer ring 2. During the driving of the vehicle, the dust and vibration caused by complex road conditions can affect the bearing, and the two folded edges cooperate with each other to strengthen the sealing from the edge, ensuring the stable operation of the bearing and prolonging its service life.

[0022] The above examples are only one of the preferred specific examples of the present application, and the usual changes and replacements made by those skilled in the art within the scope of the technical solutions of the present application are included in the protection scope of the present application.

Claims

1. A wheel hub bearing comprising an outer ring and an inner ring, a flange plate connected to the inner ring, a connecting groove formed on the inner ring, a connecting ring fitted on the connecting groove, and rolling elements arranged between the outer ring and the inner ring and between the outer ring and the connecting ring, characterized in that: The outer ring is provided with a first sealing element at one end close to the flange plate and a second sealing element at one end away from the flange plate, the first sealing element comprises one end connected to the inner wall of the outer ring and the other end extending to the inner ring, the first sealing element is covered with a first sealing lip, the inner ring is formed with a sealing step corresponding to the position of the first sealing element, a gap is formed between the outer edge of the sealing step and the edge of the outer ring, a plurality of sealing grooves are arranged on the side wall of the sealing step, and the first sealing lip extends into the sealing groove with a first blocking lip.

2. The hub bearing according to claim 1, characterized in that: The first sealing lip extends into the sealing step side wall with a second blocking lip, and the first sealing lip is further provided with a third blocking lip close to the inner ring, and the third blocking lip abuts against the outer peripheral wall of the inner ring.

3. The hub bearing of claim 1, wherein: The connecting ring is provided with a third sealing element corresponding to the position of the second sealing element, the second sealing element comprises a first longitudinal part and a first transverse part connected to each other, the third sealing element comprises a second longitudinal part and a second transverse part connected to each other, the first longitudinal part and the first transverse part and the second longitudinal part and the second transverse part are combined into an L shape respectively, the first transverse part is connected to the inner wall of the outer ring, the second transverse part is connected to the outer peripheral wall of the connecting ring, and gaps are respectively formed between the end of the first longitudinal part and the second transverse part and between the end of the second longitudinal part and the first transverse part, and the first longitudinal part is closer to the rolling body than the second longitudinal part.

4. The hub bearing of claim 3, wherein: The first longitudinal part is covered with a second sealing lip, the second sealing lip comprises a fourth blocking lip abutting against the second longitudinal part and a fifth blocking lip abutting against the second transverse part.

5. The hub bearing of claim 4, wherein: The free end of the second longitudinal part extends to the rolling body direction with a first folding edge, and the free end of the second transverse part extends to the outer ring direction with a second folding edge.

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