A rolling bearing

Abstract

This utility model discloses a rolling bearing, including an outer ring, an inner ring, a plurality of rolling elements, and a cage connected to and guiding the rolling elements. Seals are respectively fitted between the two end faces of the outer ring and the inner ring. Each seal includes a sealing cap and a sealing ring. The sealing cap is fixedly disposed at the end of the inner ring, and a gap is left between the inner side of the sealing cap and the end face of the outer ring. An annular flange protrudes outward from the inner side of the sealing cap and is arranged along its central axis. Grooves are respectively recessed at both ends of the outer ring. The annular flange is located within the groove, and a sealing cavity is formed between it and the groove. The sealing ring is interference-fitted onto the annular flange, and the sealing ring has a first sealing lip and a second sealing lip protruding outward. The first sealing lip and the second sealing lip respectively seal against the inner side of the sealing cavity.

Description

Technical Field

[0001] This utility model specifically relates to a rolling bearing. Background Technology

[0002] As a key component in mechanical transmission systems, rolling bearings often operate in environments contaminated with dust, moisture, impurities, and other pollutants. Simultaneously, the bearing's internal structure requires grease to maintain proper lubrication between the rolling elements and raceways. Poor sealing performance allows contaminants to easily penetrate the bearing, leading to grease contamination and loss, accelerating wear on the rolling elements and raceways, and severely impacting the bearing's service life and operational stability. Conversely, adequate internal grease can also leak due to seal failure, reducing lubrication effectiveness. Utility Model Content

[0003] In view of the defects of the existing technology, the technical problem to be solved by this utility model is to provide a rolling bearing.

[0004] A rolling bearing includes an outer ring, an inner ring, a plurality of rolling elements, and a cage connected to and guiding the rolling elements. Seals are respectively fitted between the end faces of the outer ring and the inner ring. Each seal includes a sealing cap and a sealing ring. The sealing cap is fixedly disposed at the end of the inner ring, with a gap between the inner side of the sealing cap and the end face of the outer ring. An annular flange protrudes from the inner side of the sealing cap and is centered on it. Grooves are recessed at both ends of the outer ring. The annular flange is located within the grooves, forming a sealing cavity between it and the grooves. The sealing ring is interference-fitted onto the annular flange, and the sealing ring has a first sealing lip and a second sealing lip protruding from it. The first and second sealing lips respectively seal against the inner side of the sealing cavity.

[0005] In one embodiment, the first sealing lip and the second sealing lip are respectively coplanar with the contact surfaces of the sealing cavity.

[0006] In one embodiment, the first sealing lip and the second sealing lip are respectively not coplanar with the contact surfaces of the sealing cavity.

[0007] In one embodiment, an L-shaped flange is provided in the groove, and the L-shaped flange forms a cavity with the sidewall of the groove. The second sealing lip is located in the cavity and does not contact the L-shaped flange.

[0008] In one embodiment, the first sealing lip is provided in two or more spaced outwards from the center of the sealing ring.

[0009] In one embodiment, the interference fit between the first sealing lip and the second sealing lip and the sealing cavity is 0.10 mm.

[0010] In one embodiment, the height of the annular flange is less than the depth of the groove.

[0011] In one embodiment, the diameter of the sealing cap is smaller than the diameter of the bearing outer ring.

[0012] In one embodiment, the width of the gap is 0.1 mm to 0.3 mm.

[0013] In summary, the advantages of this utility model compared to the prior art are as follows: The sealing element of this utility model adopts a combination structure of a sealing cap and a sealing ring. The first sealing lip and the second sealing lip on the sealing ring respectively seal against the inner side of the sealing cavity, forming multiple sealing barriers, which can effectively block the intrusion of external contaminants and prevent internal grease leakage, significantly improving the sealing performance of the bearing. The sealing cap is fixed to the end of the inner ring of the bearing, and the annular flange and the groove of the outer ring of the bearing cooperate to form a sealing cavity. The sealing ring is interference-fitted onto the annular flange to ensure that the sealing element will not loosen or shift during the operation of the bearing, ensuring the long-term stability of the sealing structure. In addition, there is a gap between the inner side of the sealing cap and the end face of the outer ring of the bearing to avoid wear caused by direct friction between the sealing cap and the outer ring. The sealing lip of the sealing ring adopts a reasonable interference fit design, which reduces excessive wear of the sealing lip while ensuring the sealing effect, and extends the service life of the sealing element. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of a rolling bearing in one embodiment of the present invention;

[0015] Figure 2 As one embodiment of this utility model Figure 1 Enlarged view of point A;

[0016] Figure 3 This is a perspective view of a rolling bearing in one embodiment of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0018] like Figures 1 to 3The present invention preferably provides a rolling bearing, including an outer ring 1, an inner ring 2, a plurality of rolling elements 3, and a cage 4 connected to and guiding the rolling elements 3 to rotate. A sealing element 5 is respectively fitted between the two end faces of the outer ring 1 and the inner ring 2. The sealing element 5 includes a sealing cap 6 and a sealing ring 7. The sealing cap 6 is fixedly disposed at the end of the inner ring 2, and a gap 8 is left between the inner side of the sealing cap 6 and the end face of the outer ring 1. An annular flange 9 protrudes outward from the inner side of the sealing cap 6 and is arranged along its central axis. Grooves 10 are respectively recessed at both ends of the outer ring 1. The annular flange 9 is located within the groove 10, and a sealing cavity is formed between it and the groove 10. The sealing ring 7 is interference-fitted onto the annular flange 9, and a first sealing lip 11 and a second sealing lip 12 protrude outward from the sealing ring 7. The first sealing lip 11 and the second sealing lip 12 respectively seal against the inner side of the sealing cavity.

[0019] Specifically, the seal adopts a combination structure of a sealing cap and a sealing ring. The sealing cap is made of metal and is fixed to the end of the bearing inner ring by interference fit, welding, or sealant, rotating synchronously with the bearing inner ring. A gap is left between the inner side of the sealing cap and the end face of the bearing outer ring. This gap can prevent direct friction between the two during bearing operation, reducing wear. The first and second sealing lips on the sealing ring respectively seal against the inner side of the sealing cavity, forming multiple sealing barriers, which can effectively prevent external contaminants from entering and prevent internal grease leakage, significantly improving the sealing performance of the bearing. The sealing cap is fixed to the end of the bearing inner ring, and the annular flange fits with the groove of the bearing outer ring to form a sealing cavity. The sealing ring is interference-fitted onto the annular flange to ensure that the seal will not loosen or shift during bearing operation, ensuring the long-term stability of the sealing structure. The sealing lip of the sealing ring adopts a reasonable interference fit design, which reduces excessive wear of the sealing lip while ensuring the sealing effect, extending the service life of the seal.

[0020] In one embodiment, the first sealing lip 11 and the second sealing lip 12 are coplanar with the contact surfaces of the sealing cavity. That is, the contact portions of the first sealing lip and the sealing cavity, and the contact portions of the second sealing lip and the sealing cavity are on the same plane. This design allows for a more uniform distribution of contact stress between the sealing lip and the sealing cavity, avoiding premature wear of the sealing lip due to excessive local stress, and also facilitates the processing and shaping of the sealing cavity.

[0021] In another embodiment, the first sealing lip 11 and the second sealing lip 12 are not coplanar with the contact surfaces of the sealing cavity. That is, the contact plane of the first sealing lip and the contact plane of the second sealing lip form a certain angle. This structure allows the two sealing lips to form a staggered sealing barrier inside the sealing cavity. When external contaminants break through the first sealing lip, the second sealing lip can further block them, improving the redundancy of the seal, which is especially suitable for harsh environments with a large amount of contaminants.

[0022] Furthermore, an L-shaped flange 13 is provided within the groove 10, and the L-shaped flange 13 forms a cavity with the sidewall of the groove 10. The second sealing lip 12 is located within the cavity and does not contact the L-shaped flange 13. The L-shaped flange can provide initial blocking for contaminants entering the sealing cavity.

[0023] Furthermore, two or more first sealing lips 11 are spaced outwards from the center of the sealing ring 7. These multiple first sealing lips are arranged sequentially along the inner wall of the sealing cavity, forming multiple lines of defense. When external contaminants attempt to intrude, they must overcome the obstruction of multiple first sealing lips in sequence, significantly reducing the probability of contaminants entering the bearing and further enhancing the sealing effect. The gaps between adjacent first sealing lips also serve a certain function of contaminant storage, reducing wear on the sealing lips.

[0024] Furthermore, the interference fit between the first sealing lip 11 and the second sealing lip 12 and the sealing cavity is 0.10 mm. This interference fit ensures that the sealing lip fits tightly against the inner wall of the sealing cavity, forming an effective seal, while avoiding excessive interference fit that could lead to excessive deformation of the sealing lip and increased frictional resistance. The 0.10 mm interference fit is within the elastic range of the rubber material, allowing the sealing lip to maintain a good fit throughout the bearing's operation, balancing sealing performance and operational flexibility.

[0025] Furthermore, the height of the annular flange 9 is less than the depth of the groove 10. This design allows the annular flange to be completely contained within the groove, preventing rigid collisions between the two when the bearing is subjected to axial force, and providing a certain buffer space for the axial assembly of the bearing. Simultaneously, it ensures that the sealing cavity has sufficient volume, providing ample space for the installation of the sealing ring and the deformation of the sealing lip, thus guaranteeing the stability of the sealing structure.

[0026] Furthermore, the diameter of the sealing cap 6 is smaller than the diameter of the bearing outer ring 1. This structural design avoids the sealing cap protruding beyond the outer side of the bearing outer ring, reducing the risk of collision or interference between the sealing cap and external components during bearing installation and use, and making the overall bearing structure more compact, adapting to the installation requirements of confined spaces.

[0027] Furthermore, the width of the gap 8 is 0.1mm to 0.3mm. This gap width effectively prevents frictional contact between the sealing cover and the outer ring end face of the bearing, while also preventing excessively large gaps from allowing contaminants to easily enter the sealing cavity. The range of 0.1mm to 0.3mm balances the needs for friction prevention and initial dust prevention. During normal bearing operation, the air within the gap can form a certain airflow barrier, further blocking the intrusion of minute contaminants.

[0028] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rolling bearing, comprising an outer ring (1), an inner ring (2), a plurality of rolling elements (3), and a cage (4) connected to and guiding the rolling elements (3) to rotate, wherein seals (5) are respectively fitted between the two end faces of the outer ring (1) and the inner ring (2), characterized in that: The sealing element (5) includes a sealing cover (6) and a sealing ring (7). The sealing cover (6) is fixedly disposed at the end of the inner ring (2) of the bearing, and a gap (8) is left between the inner side of the sealing cover (6) and the end face of the outer ring (1) of the bearing. The inner side of the sealing cover (6) has an annular flange (9) arranged with the central axis thereon. The two ends of the outer ring (1) of the bearing are respectively recessed with grooves (10). The annular flange (9) is located in the groove (10) and a sealing cavity is formed between it and the groove (10). The sealing ring (7) is interference-fitted onto the annular flange (9), and the sealing ring (7) has a first sealing lip (11) and a second sealing lip (12) respectively protruding outward. The first sealing lip (11) and the second sealing lip (12) respectively seal against the inner side of the sealing cavity.

2. A rolling bearing according to claim 1, characterized in that: The first sealing lip (11) and the second sealing lip (12) are respectively coplanar with the contact surface of the sealing cavity.

3. A rolling bearing according to claim 1, characterized in that: The first sealing lip (11) and the second sealing lip (12) are respectively not coplanar with the contact surfaces of the sealing cavity.

4. A rolling bearing according to claim 3, characterized in that: An L-shaped flange (13) is provided in the groove (10). The L-shaped flange (13) and the side wall of the groove (10) form a cavity. The second sealing lip (12) is located in the cavity and does not contact the L-shaped flange (13).

5. A rolling bearing according to claim 1, characterized in that: The first sealing lip (11) is provided in two or more spaced outwards from the center of the sealing ring (7).

6. A rolling bearing according to claim 1, characterized in that: The interference fit between the first sealing lip (11) and the second sealing lip (12) and the sealing cavity is 0.10 mm.

7. A rolling bearing according to claim 1, characterized in that: The height of the annular flange (9) is less than the depth of the groove (10).

8. A rolling bearing according to claim 1, characterized in that: The diameter of the sealing cap (6) is smaller than the diameter of the bearing outer ring (1).

9. A rolling bearing according to claim 1, characterized in that: The width of the gap (8) is 0.1 mm to 0.3 mm.

Images