High-reliability automotive wheel hub bearings with anti-disengagement seal structure

Abstract

This utility model relates to a highly reliable anti-disengagement sealing structure for automotive wheel bearings, belonging to the field of automotive parts technology. It includes a wheel hub, with a drive shaft fitted inside the hub, and a wheel bearing positioned between the drive shaft and the hub. The wheel bearing includes an outer ring, within which are a pair of mirror-symmetrically distributed inner rings. Sealing ring assemblies are provided between the outer ring and the inner rings at both ends. The sealing ring assembly includes an outer skeleton fitted with the outer ring, an inner skeleton fitted with the inner ring between the outer skeleton and the inner ring, a sealing lip II that is fixedly connected to the outer skeleton at its front end, and a sealing lip I that is fixedly connected to the outer skeleton at its front end. This design features highly reliable sealing, an anti-disengagement design, extended service life, and improved driving safety. It significantly improves the reliability of the seal and the stability of the structure, effectively preventing the seal from disengaging, thereby extending the service life of the wheel bearing and ensuring driving safety.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an automotive wheel hub bearing with a highly reliable anti-disengagement sealing structure. Background Technology

[0002] Wheel hub bearing units are components used in automotive wheel hubs to bear weight and provide precise guidance for wheel hub rotation. They withstand both axial and radial loads, making them a crucial part of a vehicle's load-bearing and rotational systems. Existing tapered roller bearing wheel hub units typically consist of an outer ring with double raceways, two inner rings with single raceways, a roller assembly secured by two rows of nylon cages, and seals. Currently, this product is prone to the following problems in practical applications within rear axle wheel hub housings: 1. After the sealing ring assembly is assembled, it may come detached. After reassembly, the lip may turn upside down, causing poor sealing, leading to water ingress or grease leakage, and ultimately bearing failure.

[0003] 2. After the sealing ring assembly is pressed into the bearing, the inner and outer sealing rings may separate during packaging, transportation, etc., due to the relative movement of the inner and outer rings of the bearing.

[0004] The current solutions are to add an inner plug to the bearing's inner diameter or a ferrule to the inner ring's small flange. Using an inner plug requires removing it before installation, while using a ferrule necessitates additional checks to ensure no ferrules are missing or over-installed. Both solutions increase costs and operational steps.

[0005] 3. After the sealing ring is press-fitted, the assembly operators spend a lot of time checking whether the sealing ring is qualified. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a highly reliable anti-disengagement sealing structure for automotive wheel hub bearings. It features high-reliability sealing, anti-disengagement design, extended service life, and improved driving safety. By improving the structural design of the sealing ring assembly, the reliability of the seal and the stability of the structure are significantly enhanced, effectively preventing the seal from disengaging, thereby extending the service life of the wheel hub bearing and ensuring driving safety.

[0007] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions: A high-reliability anti-disengagement sealing structure for automotive wheel bearings includes a wheel hub, a drive shaft fitted inside the wheel hub, and a wheel bearing positioned between the drive shaft and the wheel hub. The wheel bearing includes an outer ring, within which are a pair of mirror-symmetrically distributed inner rings. Sealing ring assemblies are provided between the outer ring and the inner rings at both ends. Each sealing ring assembly includes an outer skeleton fitted with the outer ring, an inner skeleton fitted with the inner rings between the outer skeleton and the inner rings, a sealing lip II that is fixedly connected to the outer skeleton via a snap-fit ​​connection between the front end of the outer skeleton and the inner skeleton, and a sealing lip I that is fixedly connected to the front end of the inner skeleton via a snap-fit ​​connection between the inner skeleton and the outer skeleton.

[0008] Preferably, a retainer is provided between the outer ring and the inner ring, and the retainer is provided with a plurality of rollers arranged in a ring and rolled and engaged with the retainer.

[0009] Preferably, the sealing lip II has a bent ring integrated with the inner skeleton on its side.

[0010] Preferably, the sealing lips I and II have a "Y"-shaped structure, and the included angle between the two radial lips on sealing lip I and sealing lip II is 90° to 110°. This angle range can effectively reduce frictional torque and wear while ensuring sufficient sealing contact pressure.

[0011] Preferably, the rear end of the wheel hub bearing is provided with a pair of retaining rings with a semi-circular structure that are inserted into the drive shaft in a slotted manner.

[0012] Preferably, a hub flange is provided between the hub and the hub bearing, and is bolted to the hub for fixing.

[0013] This invention can achieve the following effects: This invention provides a highly reliable anti-disengagement sealing structure for automotive wheel hub bearings. Compared with existing technologies, it features highly reliable sealing, anti-disengagement design, extended service life, and improved driving safety. By improving the structural design of the sealing ring assembly, the reliability of the seal and the stability of the structure are significantly enhanced, effectively preventing the seal from disengaging, thereby extending the service life of the wheel hub bearing and ensuring driving safety.

[0014] High-reliability seal: By setting up independent sealing lips I and sealing lips II that are respectively embedded and fixed to the inner and outer skeletons, a two-way, multi-layer sealing barrier is formed, which greatly improves the sealing performance and effectively prevents grease leakage and external contaminant intrusion.

[0015] Anti-disengagement design: The sealing lip and the skeleton are fixed by a snap-fit, especially the integrated bending ring design on the side of sealing lip II, which forms a mechanical interlocking structure. Even under severe vibration and impact, the seal is not easy to shift or disengage, ensuring the long-term stability of the sealing structure.

[0016] Extended service life: Excellent sealing performance and structural stability effectively protect the rolling elements and raceways inside the bearing, reducing wear and corrosion, thereby significantly extending the overall service life of the hub bearing.

[0017] Enhancing driving safety: Reliable wheel bearings are essential for safe driving. This invention indirectly improves the overall driving safety and stability of the vehicle by increasing the reliability of the bearings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a cross-sectional view of the hub bearing in this utility model.

[0020] Figure 3 This is a structural schematic diagram of the sealing ring assembly in this utility model.

[0021] In the diagram: 1. Hub 2. Hub flange 3. Hub bearing 4. Drive shaft 5. Snap ring 6. Inner ring 7. Outer ring 8. Roller 9. Sealing ring assembly 10. Cage 11. Outer skeleton 11. Sealing lip I 12. Sealing lip II 13. Bending ring 14. Inner skeleton 15. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] Example: Figure 1 , Figure 2 and Figure 3As shown, a high-reliability anti-disengagement sealing structure for automotive wheel bearings includes a wheel hub 1, a drive shaft 4 fitted inside the wheel hub 1, a wheel hub bearing 3 between the drive shaft 4 and the wheel hub 1, and a wheel hub flange 2 bolted to and fixed between the wheel hub 1 and the wheel hub bearing 3. The rear end of the wheel hub bearing 3 has a pair of semi-circular retaining rings 5 ​​that are slotted into the drive shaft 4. The wheel hub bearing 3 includes an outer ring 7, inside which are a pair of mirror-symmetrically distributed inner rings 6. A cage 10 is provided between the outer ring 7 and the inner rings 6, and 20 annularly distributed rollers 8 are provided on the cage 10 and rolled and engaged with it. Sealing ring assemblies 9 are provided between the two ends of the outer ring 7 and the inner rings 6. The sealing ring assembly 9 includes an outer frame 11 that fits into the outer ring 7, an inner frame 15 that fits into the inner ring 6 between the outer frame 11 and the inner ring 6, a sealing lip II 13 that is snap-fitted and fixedly connected to the outer frame 11 between the front end of the outer frame 11 and the inner frame 15, and a bent ring 14 integrally formed with the inner frame 15 on the side of the sealing lip II 13. A sealing lip I 12 that is snap-fitted and fixedly connected to the inner frame 15 between the front end of the inner frame 15 and the outer frame 11. The sealing lips I 12 and II 13 have a "Y" shaped structure, and the included angle between the two radial lips on the sealing lip I 12 and the sealing lip II 13 is 100°.

[0024] In summary, this high-reliability anti-disengagement sealing structure for automotive wheel bearings features high-reliability sealing, anti-disengagement design, extended service life, and improved driving safety. By improving the structural design of the sealing ring assembly, the reliability of the seal and the stability of the structure are significantly enhanced, effectively preventing seal detachment, thereby extending the service life of the wheel bearing and ensuring driving safety.

[0025] The bearing seal assembly is designed with an anti-disengagement structure, so that the seal assembly will not disengage during the movement and pressing process after assembly.

[0026] The axial lip of the outer sealing ring was changed to a radial lip. Experiments have verified that this can further improve the sealing performance of the sealing ring assembly and prevent issues such as grease leakage and water ingress.

[0027] It replaces inner plugs and ferrules, reducing accessory costs and simplifying operation steps and testing items.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A high-reliability anti-disengagement sealing structure for automotive wheel hub bearings, characterized in that: The system includes a hub (1), a drive shaft (4) fitted inside the hub (1), and a hub bearing (3) between the drive shaft (4) and the hub (1). The hub bearing (3) includes an outer ring (7), and a pair of inner rings (6) arranged in a mirror-symmetrical pattern inside the outer ring (7). Sealing ring assemblies (9) are provided between the two ends of the outer ring (7) and the inner rings (6). The sealing ring assembly (9) includes an outer frame (11) fitted with the outer ring (7), and an inner frame (15) fitted with the inner rings (6) is provided between the outer frame (11) and the inner rings (6). The outer frame (11) is provided with a sealing lip II (13) that is fixedly connected to the outer frame (11) by snapping between the front end of the outer frame (11) and the inner frame (15). The side of the sealing lip II (13) is provided with a bending ring (14) that is integrated with the inner frame (15). The front end of the inner frame (15) is provided with a sealing lip I (12) that is fixedly connected to the inner frame (15) by snapping between the front end of the inner frame (15) and the outer frame (11). The sealing lip I (12) and the sealing lip II (13) are in a "Y" shape. The included angle between the two radial lips on the sealing lip I (12) and the sealing lip II (13) is 90° to 110°.

2. The high-reliability anti-come-apart sealed automobile hub bearing according to claim 1, characterized in that: A retainer (10) is provided between the outer ring (7) and the inner ring (6). The retainer (10) is provided with a number of rollers (8) arranged in a ring and rolled and engaged with the retainer (10).

3. The high reliability anti pull out seal structure automotive hub bearing of claim 1, wherein: The rear end of the hub bearing (3) is provided with a pair of retaining rings (5) that are semi-circular in structure and are inserted into the drive shaft (4) in a slotted manner.

4. The high reliability anti pull out seal structure automotive hub bearing of claim 1, wherein: The hub (1) and the hub bearing (3) are provided with a hub flange (2) that is bolted to the hub (1).

Images