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CN-224214579-U - Sealing assembly of hub bearing

CN224214579UCN 224214579 UCN224214579 UCN 224214579UCN-224214579-U

Abstract

The utility model relates to the field of hub bearings, and discloses a sealing assembly of a hub bearing, which comprises a framework and a counter-pressure cover, wherein the framework and the counter-pressure cover are mutually encircling to form a first port and a second port, a first sealing piece is arranged on the framework, a first sealing lip and a second sealing lip which are sealed with the counter-pressure cover are arranged on the first sealing piece, the first sealing lip is sealed at the first port, a first cavity filled with grease is formed among the first sealing lip, the second sealing lip and the counter-pressure cover, a third sealing lip positioned at the second port is arranged at the other end of the first sealing piece, the third sealing lip is sealed with the counter-pressure cover under the action of external pressure, and a first gap is formed between the third sealing lip and the counter-pressure cover under the action of no external pressure. In a normal state, the first gap reduces the contact area of the third sealing lip and the framework, reduces the friction moment of the hub bearing, and when special roads such as wading are used, the external pressure effect enables the third sealing lip and the counter-pressure cover to be tightly sealed, so that impurities such as water, sediment and the like can be effectively prevented from entering the bearing.

Inventors

  • ZHOU SHOUHU
  • ZHANG CHAO
  • YU ZHENHUA
  • XU YUAN

Assignees

  • 浙江兆丰机电股份有限公司

Dates

Publication Date
20260508
Application Date
20250527

Claims (9)

  1. 1. The utility model provides a hub bearing's seal assembly, including skeleton (10) and back pressure lid (11), skeleton (10) are embraced each other with back pressure lid (11) and are formed first port (100) and second port (200), install first sealing member (12) on skeleton (10), be equipped with on first sealing member (12) with back pressure lid (11) sealed first seal lip (121) and second seal lip (122), first seal lip (121) seal in first port (100) department, form first cavity (300) between first seal lip (121), second seal lip (122) and the back pressure lid (11), first cavity (300) intussuseption is filled with grease, its characterized in that: The other end of the first sealing piece (12) is provided with a third sealing lip (123), the third sealing lip (123) is arranged at the second port (200), the third sealing lip (123) is sealed with the back pressure cover (11) under the action of external pressure, and a first gap (400) is formed between the third sealing lip (123) and the back pressure cover (11) under the action of no external pressure.
  2. 2. The hub bearing seal assembly according to claim 1, wherein the inner and outer ends of the first seal member (12) are respectively provided with an inner groove (124) and an outer groove (125), one end of the skeleton (10) is in clamping connection with the inner groove (124), and the other end of the skeleton (10) is in clamping connection with the outer groove (125).
  3. 3. The hub bearing sealing assembly according to claim 1, wherein the outer end portion of the framework (10) is provided with a notch groove (101), the first sealing element (12) is sleeved on the framework (10) and arranged on the notch groove (101), and the first sealing element (12) at the notch groove (101) is provided with an outer ring sealing portion (126) protruding outwards.
  4. 4. A hub bearing seal assembly according to claim 1, wherein the first seal (12) completely covers the inner wall of the skeleton (10).
  5. 5. The hub bearing seal assembly according to claim 1, wherein the first seal member (12) is further provided with a fourth seal lip (127), the fourth seal lip (127) is disposed between the second seal lip (122) and the third seal lip (123), a second chamber (500) is formed between the fourth seal lip (127), the second seal lip (122) and the back pressure cover (11), and grease is filled in the second chamber (500).
  6. 6. The hub bearing seal assembly according to claim 5, wherein the fourth sealing lip (127) and the second sealing lip (122) are both inclined upward, the fourth sealing lip (127) seals with the counter-pressure cover (11) under the action of the external pressure, and the fourth sealing lip (127) forms a second gap (600) with the counter-pressure cover (11) under the action of no external pressure.
  7. 7. The hub bearing seal assembly according to claim 5, wherein the first seal member (12) is provided with a blocking portion (128), the blocking portion (128) is provided between the fourth seal lip (127) and the third seal lip (123), and a third gap is formed between the blocking portion (128) and the back pressure cover (11).
  8. 8. The hub bearing seal assembly according to claim 1, wherein the skeleton (10) and the back pressure cover (11) are annular skeletons, the skeleton (10) has a 7-shaped cross section, the back pressure cover (11) has a U-shaped cross section, and the skeleton (10) and the back pressure cover (11) are surrounded to form a channel (700) having an S-shape.
  9. 9. A hub bearing seal assembly according to any one of claims 1-8, wherein the outer side wall of the counter pressure cover (11) is provided with a second seal (13) for sealing with the inner ring of the bearing, and the lower end of the second seal (13) is provided with an outwardly protruding sealing collar (131).

Description

Sealing assembly of hub bearing Technical Field The utility model relates to the field of hub bearings, in particular to a sealing assembly of a hub bearing. Background In the field of sealing technology for automobile hub bearing units, a conventional sealing structure generally adopts 2-3 sealing lips to realize sealing (as shown in the prior art of publication number CN 203962703U). Although the multi-lip sealing mode can meet the basic sealing requirement, the multi-lip sealing mode has the obvious defect that excessive contact sealing can cause the friction moment of a hub bearing to be obviously increased, and particularly for new energy automobiles, the low-torque design is a key technical index for reducing friction loss and improving the cruising ability, and the traditional sealing element structure limits the improvement of the cruising ability of the new energy automobile to a certain extent due to larger friction moment. In addition, in the prior art, although a part of sealing structure (such as a skeleton labyrinth sealing element of CN 203962703U) is matched with a sealing lip through a counter cover to improve the silt preventing capability, the balance of friction loss and sealing performance is not fully considered. For example, although the waterproof and leak-proof performance is enhanced by adopting the multi-seal lip design, the contact area of the lip and the counter-pressure cover is larger, the friction resistance is higher, and the severe requirement of the new energy automobile on low torque is difficult to meet. Therefore, on the premise of ensuring the sealing reliability, the contact area between the sealing lip and the matched part is reduced, and the friction moment is reduced, so that the sealing technology of the hub bearing of the new energy automobile is improved. According to the technical scheme, the sealing lips with different functions are respectively arranged at the first port and the second port by optimizing the layout of the sealing lips and the pressure response mechanism, and the sealing gap is dynamically adjusted by utilizing external pressure, so that the problem that the friction moment of the traditional multi-lip sealing structure is overlarge is solved, and the performance requirements of a new energy automobile on low energy consumption and long endurance are met. Disclosure of utility model The present utility model addresses the shortcomings in the prior art by providing a seal assembly for a hub bearing. In order to solve the technical problems, the utility model is solved by the following technical scheme: The sealing assembly of the hub bearing comprises a framework and a counter-pressure cover, wherein the framework and the counter-pressure cover are mutually encircling to form a first port and a second port, a first sealing piece is arranged on the framework, a first sealing lip and a second sealing lip which are sealed with the counter-pressure cover are arranged on the first sealing piece, the first sealing lip is sealed at the first port, a first cavity is formed between the first sealing lip, the second sealing lip and the counter-pressure cover, grease is filled in the first cavity, a third sealing lip is arranged at the other end of the first sealing piece, the third sealing lip is arranged at the second port and is sealed with the counter-pressure cover under the action of external pressure, and a first gap is formed between the third sealing lip and the counter-pressure cover under the action of no external pressure. Preferably, the inner end and the outer end of the first sealing piece are respectively provided with an inner groove and an outer groove, one end of the framework is connected with the inner groove in a clamping way, and the other end of the framework is connected with the outer groove in a clamping way. Preferably, a notch groove is formed in the outer end portion of the framework, the first sealing piece is sleeved on the framework and arranged on the notch groove, and an outer ring sealing portion protruding outwards is arranged on the first sealing piece at the notch groove. Preferably, the first seal completely covers the inner wall of the skeleton. Preferably, the first sealing member is further provided with a fourth sealing lip, the fourth sealing lip is arranged between the second sealing lip and the third sealing lip, a second cavity is formed among the fourth sealing lip, the second sealing lip and the back pressure cover, and grease is filled in the second cavity. Preferably, the fourth sealing lip and the second sealing lip are both inclined upwards, the fourth sealing lip seals with the back pressure cover under the action of external pressure, and a second gap is formed between the fourth sealing lip and the back pressure cover under the action of no external pressure. Preferably, the first sealing member is provided with a blocking part, the blocking part is arranged between the fourth sealing lip and the th