Hub bearing with low friction seal assembly
By designing low-friction sealing components in hub bearings and using technical means such as maze structure and waterproof lip, the problems of fast wear and large rotational torque of the sealing device are solved, and more efficient sealing performance and low torque characteristics are achieved.
Patent Information
- Application Number
- CN202420833304.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-19
AI Technical Summary
The existing hub bearing sealing devices wear quickly under the influence of the environment, which is prone to grinding effects. The multi-lip sealing structure generates a large rotational torque during rotation, which cannot meet the needs of low torque. At the same time, the interference fit causes the sealing ring cover to be axially displaced, resulting in failure.
A hub bearing with a low friction seal assembly is designed, and a low torque seal assembly with relatively rotating flange outer ring and flange. The sealing member forms a maze structure with the sealing ring cover for sealing, and blocks mud and water through the waterproof lip and mud and water lip to reduce the entry of foreign objects.
The maze structure reduces the entry of foreign objects, reduces the wear of the sealing lip, and improves the sealing effect; reduces the rotational torque to meet the needs of low torque; limits the axial movement of the sealing ring cover through the boss to prevent failure.
Smart Images
Figure CN222596583U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a wheel hub bearing with a low-friction sealing component. Background Art
[0002] The wheel hub bearing is one of the key components of an automobile. Its main function is to bear weight and provide precise guidance for the rotation of the wheel hub, which requires it to be able to withstand not only axial loads but also radial loads.
[0003] The disadvantage of the prior art seals is that environmental influences can act directly on the sealing lip from the outside, wherein the material of the sealing lip, which is usually an elastomer, wears very quickly. If foreign matter such as sand or water is introduced, a grinding effect occurs, which wears the sealing lip, creates grooves in the counter-running surface and thus reduces the preload of the sealing lip.
[0004] The sealing devices in the prior art mostly use multi-lip seals. At this time, due to too many contact lips, the rotational torque generated during the rotation process will be very large, which cannot meet the low torque requirements of existing new energy vehicles; the sealing devices in the prior art mostly only use interference fit at the joint with the flange. When the bearing is subjected to large and alternating axial forces, this kind of fit will cause axial displacement of the sealing ring cover, thereby causing failure. Utility Model Content
[0005] In view of the deficiencies of the prior art, the utility model provides a wheel hub bearing with a low-friction sealing assembly.
[0006] To achieve the above-mentioned purpose, the utility model provides a wheel hub bearing with a low-friction sealing assembly, comprising a fixed flange outer ring and a flange plate rotatably arranged relative to the flange outer ring, a low-torque sealing assembly is arranged between the flange plate and the flange outer ring, the low-torque sealing assembly comprises a sealing member arranged on the flange outer ring and a sealing ring cover arranged on the flange plate, the sealing member and the sealing ring cover can rotate relative to each other, a labyrinth structure is formed between the sealing member and the sealing ring cover for sealing, a water retaining lip extending toward the flange plate is arranged on the sealing member, the water retaining lip and the end face of the flange plate form a first gap for retaining mud and water, the sealing member is provided with a mud and water lip extending toward the sealing ring cover and abutting and cooperating to form a single-point contact in the labyrinth structure, a boss is also arranged on the outer peripheral wall of the flange plate corresponding to the sealing ring cover installation, and the axial movement of the sealing ring cover is limited by the boss and it is prevented from falling off.
[0007] Furthermore, the sealing ring cover is provided with a bent section extending toward the outer ring of the flange, the bent section of the sealing ring cover is gap-matched with an end of the sealing member facing radially outward to form a second gap, the bent section is provided with a first labyrinth lip near the water retaining lip, the water retaining lip is provided with a second labyrinth lip forming a gap with the first labyrinth lip, the sealing member is provided with a third labyrinth lip bent in a radially outward direction on the inner side of the second gap, a reflux space is formed between the third labyrinth lip and the sealing ring cover, and the gap between the first labyrinth lip and the second labyrinth lip to the second gap and the reflux space form the labyrinth structure.
[0008] Furthermore, the third labyrinth lip and the sealing ring cover form a radial gap and an axial gap respectively, and the radial gap and the axial gap are 0.4-0.6 mm.
[0009] Furthermore, the sealing component also includes a frame which is interference-fitted with the outer ring of the flange, and the frame is made of SPCC.
[0010] Furthermore, the sealing ring cover is provided with a sealing protrusion near the first labyrinth lip, and the sealing protrusion is in abutment with the flange.
[0011] The beneficial effects of the utility model are as follows: the structure of the utility model is sealed through a flange outer ring, a flange disk that can be driven by a wheel to rotate compared to the flange outer ring, and a relatively rotating seal, a sealing ring cover, and a labyrinth structure formed between the seal and the sealing ring cover. The labyrinth structure is provided with a mud and water lip that extends toward the sealing ring cover and abuts to form a single-point contact. The mud and water performance of the sealing device is ensured by blocking the mud and water lip, and at the same time, the labyrinth structure increases the difficulty of mud and water entering through the gap between the sealing ring cover and the seal, thereby ensuring the sealing performance of the sealing device; a boss is also provided on the outer peripheral wall of the flange disk corresponding to the sealing ring cover, and the boss is used to limit the axial movement of the sealing ring cover and prevent it from falling off. The rotational torque of the product is reduced by reducing the sealing lips abutting between the seal and the sealing ring cover, reducing the assembly weight and processing steps, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the cross-sectional structure in an embodiment of the utility model;
[0013] Figure 2 It is a schematic diagram of the gap cross-section structure in an embodiment of the utility model. DETAILED DESCRIPTION
[0014] The following is a further description of the embodiment of the utility model in conjunction with the accompanying drawings: As shown in the figure, a wheel hub bearing with a low-friction sealing assembly comprises a fixedly arranged flange outer ring 1, a flange 2 rotatably arranged relative to the flange outer ring 1, a low-torque sealing assembly is arranged between the flange 2 and the flange outer ring 1, the low-torque sealing assembly comprises a sealing member 3 arranged on the flange outer ring 1, and a sealing ring cover 4 arranged on the flange 2, the sealing member 3 and the sealing ring cover 4 can rotate relative to each other, a labyrinth structure is formed between the sealing member 3 and the sealing ring cover 4 for sealing, a water retaining lip 5 extending toward the flange 2 is arranged on the sealing member 3, the water retaining lip 5 and the end surface of the flange 2 form a first gap 6 for blocking mud and water, the sealing member 3 is provided with a mud and water lip 7 extending toward the sealing ring cover 4 and abutting and matching to form a single-point contact in the labyrinth structure, and a boss 8 is also arranged on the outer peripheral wall of the flange 2 corresponding to the sealing ring cover 4, and the boss 8 is used to limit the axial movement of the sealing ring cover 4 and prevent it from falling off. The labyrinth structure reduces the entry of sand or water into the bearing, reduces the grinding effect caused by sand or water, reduces the wear of the sealing lip, and improves the sealing effect.
[0015] The sealing ring cover 4 is provided with a bent section 9 extending toward the flange outer ring 1, and the bent section 9 of the sealing ring cover 4 is gap-matched with the radially outward end of the sealing member 3 to form a second gap 10. The bent section 9 is provided with a first labyrinth lip 11 near the water retaining lip 5, and the water retaining lip 5 is provided with a second labyrinth lip 12 that forms a gap with the first labyrinth lip 11. The sealing member 3 is provided with a third labyrinth lip 13 bent in a radially outward direction on the inner side of the second gap 10, and a reflow space 14 is formed between the third labyrinth lip 13 and the sealing ring cover 4, and the gap between the first labyrinth lip 11 and the second labyrinth lip 12 to the second gap 10 and the reflow space 14 form the labyrinth structure. The labyrinth structure starts from the gap between the first labyrinth lip 11 and the second labyrinth lip 12, passes through the second gap 10 formed by the gap between the bent section 9 of the sealing ring cover 4 and the radially outward end of the sealing member 3, and finally passes through the return space 14 formed between the third labyrinth lip 13 and the sealing ring cover 4. It can effectively prevent foreign matter from entering and prevent the mud and water lip 7 located in the middle of the sealing member 3 from excessive wear against foreign matter. The mud and water lip 7 is closer to the axis than the third labyrinth lip 13.
[0016] The third labyrinth lip 13 and the sealing ring cover 4 form a radial gap 16 and an axial gap 17 respectively, and the radial gap and the axial gap are 0.4-0.6 mm. The first gap 6 is generally 0.8-1.2 mm.
[0017] The sealing member 3 also includes a frame which is interference fit with the flange outer ring 1, and the frame is made of SPCC. The sealing ring cover 4 is composed of SUS430 and NBR, and the sealing member 3 is composed of SPCC and NBR.
[0018] The second gap 10 has a certain length and forms a maze with the reflux space 14. At the same time, in order to prevent the sealing ring cover 4 from axial displacement due to force during use, an anti-slip structure is designed at the matching position of the sealing ring cover 4 and the flange 2, that is, a boss 8 is designed at the matching position of the flange 2. Under the premise of ensuring the sealing function and strength, the wheel hub bearing torque is effectively reduced to meet the customer's demand for low torque.
[0019] The sealing ring cover 4 is provided with a sealing convex point 15 near the first labyrinth lip 11, and the sealing convex point 15 is in contact with the flange 2. The muddy and water performance of the sealing device is ensured by blocking the muddy and water lip 7, and at the same time, the interference fit between the sealing convex point 15 and the flange 2 blocks the passage for muddy and water to enter through the matching end surface of the sealing ring cover 4 and the flange 2, thereby ensuring the sealing performance of the sealing device.
[0020] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.
Claims
1. A wheel hub bearing with a low-friction seal assembly, comprising a fixed flange outer ring and a flange plate rotatably arranged relative to the flange outer ring, characterized in that: A low-torque sealing assembly is arranged between the flange and the flange outer ring, and the low-torque sealing assembly includes a sealing member arranged on the flange outer ring and a sealing ring cover arranged on the flange. The sealing member and the sealing ring cover can rotate relative to each other, and a labyrinth structure is formed between the sealing member and the sealing ring cover for sealing. The sealing member is provided with a water retaining lip extending toward the flange, and the water retaining lip and the end face of the flange form a first gap to block mud and water. The sealing member is provided with a mud and water lip extending toward the sealing ring cover and abutting to form a single-point contact in the labyrinth structure. A boss is also arranged on the outer peripheral wall of the flange corresponding to the sealing ring cover, and the axial movement of the sealing ring cover is limited by the boss and it is prevented from falling off.
2. The wheel hub bearing with a low friction seal assembly according to claim 1, characterized in that: The sealing ring cover is provided with a bent section extending toward the outer ring of the flange, the bent section of the sealing ring cover is gap-matched with an end of the sealing member facing radially outward to form a second gap, the bent section is provided with a first labyrinth lip near the water retaining lip, the water retaining lip is provided with a second labyrinth lip that forms a gap with the first labyrinth lip, the sealing member is provided with a third labyrinth lip bent in a radially outward direction on the inner side of the second gap, a reflux space is formed between the third labyrinth lip and the sealing ring cover, and the gap between the first labyrinth lip and the second labyrinth lip to the second gap and the reflux space form the labyrinth structure.
3. The wheel hub bearing with a low friction seal assembly according to claim 2, characterized in that: The third labyrinth lip and the sealing ring cover form a radial gap and an axial gap respectively, and the radial gap and the axial gap are 0.4-0.6 mm.
4. The wheel hub bearing with a low friction seal assembly according to claim 1, characterized in that: The sealing component also includes a frame which is interference-fitted with the outer ring of the flange, and the frame is made of SPCC.
5. The wheel hub bearing with a low friction seal assembly according to claim 2, characterized in that: The sealing ring cover is provided with a sealing protrusion near the first labyrinth lip, and the sealing protrusion is in abutment with the flange.