A sealing structure of a conical hub bearing of an automobile

Abstract

The utility model relates to a kind of sealing structure of automobile conic wheel hub bearing, belong to wheel hub bearing technical field, including wheel hub flange, bearing outer ring is equipped with and is connected with wheel hub flange on wheel hub flange, a pair of inner ring is equipped with and is distributed in mirror image between bearing outer ring and wheel hub flange, inner ring and bearing outer ring are evenly equipped with retainer between, several conic rollers that are annularly distributed are evenly equipped on retainer, multiple-lip skeleton seal ring is equipped between the front end or both ends of bearing outer ring and wheel hub flange. Multiple-lip skeleton seal ring includes skeleton ring and support ring, sealing ring is equipped on skeleton ring and is covered with skeleton ring, axial main lip and axial vice lip are equipped between sealing ring side and support ring, radial main lip and radial vice lip are equipped between sealing ring lower end and support ring. With compact structure, good sealing and good operating stability characteristics. Four-lip sealing structure is used to improve the sealing performance, durability and reliability of bearing. Can greatly prolong the service life of bearing under harsh road conditions.

Description

Technical Field

[0001] This utility model relates to the field of wheel hub bearing technology, specifically to a sealing structure for an automotive tapered wheel hub bearing. Background Technology

[0002] Wheel bearings are the core components connecting the wheels to the axle (or steering knuckle), responsible for bearing the vehicle's weight and providing precise rotational guidance. Their development has roughly gone through four generations of technological iterations:

[0003] The first generation uses two independent single-row bearings (such as angular contact ball bearings or tapered roller bearings), which require adjustment of clearance during assembly. The structure is simple, but the installation is cumbersome and the sealing performance is poor.

[0004] The second generation integrates the bearing with a flange (usually with an outer flange), which simplifies installation, but still requires an external seal.

[0005] The third generation achieves a high degree of integration, typically featuring an inner flange for connecting the wheels and an outer flange for connecting the suspension, and integrating ABS wheel speed sensors and gear rings. This is currently the mainstream product in the passenger car market.

[0006] Fourth generation: Further integrates constant velocity universal joint with bearing unit, with more compact structure, mainly used for drive wheels, and has higher technical requirements.

[0007] Wheel hub bearings operate in extremely harsh environments, directly exposed to mud, dust, sand, and temperature fluctuations. Seal failure is a major cause of premature bearing damage (such as abnormal noise, wear, and seizing). Summary of the Invention

[0008] This invention primarily addresses the shortcomings of existing technologies by providing a sealing structure for automotive tapered wheel hub bearings. This structure features a compact design, excellent sealing performance, and high operational stability. The four-lip seal structure offers significantly superior protection compared to traditional single-lip or double-lip seals, enhancing the bearing's sealing performance, durability, and reliability. This greatly extends the bearing's service life under harsh road conditions.

[0009] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0010] A sealing structure for an automotive tapered wheel hub bearing includes a hub flange. An outer bearing ring is fitted onto the hub flange. A pair of mirror-image inner rings are positioned between the outer bearing ring and the hub flange. A cage is provided between each inner ring and the outer bearing ring. Each cage has a plurality of annularly distributed tapered rollers. A multi-lip skeleton seal ring is provided between the front end or both ends of the outer bearing ring and the hub flange. The multi-lip skeleton seal ring includes a skeleton ring and a support ring. A sealing ring covering the skeleton ring is provided. An axial main lip and an axial secondary lip are provided between the side of the sealing ring and the support ring. A radial main lip and a radial secondary lip are provided between the lower end of the sealing ring and the support ring.

[0011] The axial primary lip and axial secondary lip contact the support ring along the axial direction (parallel to the axis of rotation). Their main function is to prevent external contaminants from entering from the axial direction. The primary lip provides the main seal, while the secondary lip provides an auxiliary seal or is used to store a small amount of grease.

[0012] The radial main lip and radial secondary lip contact the support ring along the radial direction (perpendicular to the axis of rotation). Their main function is to prevent internal grease leakage and further enhance the barrier against contaminants. The main lip is responsible for the primary seal, while the secondary lip plays a similar auxiliary role.

[0013] Preferably, the inner ring is nested with the hub flange, and the rear of the hub flange is provided with a retaining ring that limits the inner ring and is nested with the hub flange in a slotted manner. The retaining ring axially limits the inner ring to prevent axial movement during operation and ensures the stability of the bearing's internal clearance.

[0014] Preferably, the rear end of the wheel hub flange is equipped with a sensor that is inserted and fixedly connected to the outer ring of the bearing. A gear ring is nested and fixedly connected to the wheel hub flange between the wheel hub flange and the sensor. As the wheel hub flange rotates, the gear ring's teeth alternately pass through the sensor, generating an alternating electrical signal. This achieves the integration of the wheel hub bearing and the wheel speed sensor. The sensor accurately calculates the wheel speed by detecting the signal from the rotating gear ring, providing crucial data for active safety systems such as ABS and ESP (Electronic Stability Program).

[0015] Preferably, the wheel hub flange is provided with a plurality of bolts arranged in a ring at equal intervals and inserted through the wheel hub flange. The bolts are used to fasten the entire wheel hub bearing unit to the wheel hub, which is the standard way to connect the bearing and the wheel.

[0016] Preferably, the wheel hub flange end face is provided with a lightweight groove. While ensuring structural strength, the weight of the wheel hub flange is reduced by removing material from non-critical areas. This helps achieve vehicle weight reduction, thereby reducing fuel consumption, emissions, and improving handling performance.

[0017] This invention can achieve the following effects:

[0018] This invention provides a sealing structure for automotive tapered wheel hub bearings, which, compared with existing technologies, features a compact structure, excellent sealing performance, and superior operational stability. The four-lip seal structure provides protection far exceeding that of traditional single-lip or double-lip seals, improving the bearing's sealing performance, durability, and reliability. It can significantly extend the bearing's service life under harsh road conditions.

[0019] Superior sealing performance: By adopting a four-lip (two axial and two radial) multi-lip skeleton seal ring, a three-dimensional, multi-layered sealing defense is constructed, which can significantly extend the service life of the bearing and adapt to harsh working conditions.

[0020] Highly integrated: It integrates wheel speed sensors and gear rings, meeting the needs of modern automotive electronics and intelligence, and simplifying vehicle assembly.

[0021] Reliable and lightweight structure: Reliable axial positioning is achieved by using retaining rings, and lightweight parts are made lighter by setting lightweight grooves. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a structural cross-sectional view of the present invention.

[0024] Figure 3 This is a schematic diagram of the multi-lip skeleton sealing ring in this utility model.

[0025] In the diagram: Sensor 1, Bearing outer ring 2, Hub flange 3, Bolt 4, Gear ring 5, Tapered roller 6, Cage 7, Lightweight groove 8, Multi-lip skeleton seal 9, Inner ring 10, Snap ring 11, Skeleton ring 12, Seal ring 13, Axial secondary lip 14, Axial main lip 15, Support ring 16, Radial main lip 17, Radial secondary lip 18. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0027] Example: Figure 1 , Figure 2 and Figure 3As shown, a sealing structure for an automotive tapered wheel hub bearing includes a hub flange 3. Five bolts 4, evenly spaced and arranged in a ring, are inserted into the hub flange 3. A lightweight groove 8 is provided on the end face of the hub flange 3. A bearing outer ring 2 is fitted onto the hub flange 3. A sensor 1, which is inserted and fixed to the bearing outer ring 2, is located at the rear end of the hub flange 3. A gear ring 5, nested and fixed to the hub flange 3, is provided between the hub flange 3 and the sensor 1. A pair of mirror-distributed inner rings 10 are provided between the bearing outer ring 2 and the hub flange 3, nested to the hub flange 3. A retaining ring 11, which limits the inner rings 10 and is nested with the hub flange 3, is located at the rear of the hub flange 3. A cage 7 is provided between the inner ring 10 and the bearing outer ring 2. Each cage 7 has 15 tapered rollers 6 arranged in a ring. A multi-lip skeleton seal ring 9 is provided between the front end of the bearing outer ring 2 and the hub flange 3. The multi-lip skeleton sealing ring 9 includes a skeleton ring 12 and a support ring 16. The skeleton ring 12 is provided with a sealing ring 13 that covers the skeleton ring 12. An axial main lip 15 and an axial secondary lip 14 are provided between the side of the sealing ring 13 and the support ring 16. A radial main lip 17 and a radial secondary lip 18 are provided between the lower end of the sealing ring 13 and the support ring 16.

[0028] In summary, the sealing structure of this automotive tapered wheel hub bearing features a compact design, excellent sealing performance, and high operational stability. The four-lip seal structure provides significantly superior protection compared to traditional single-lip or double-lip seals, enhancing the bearing's sealing performance, durability, and reliability. This greatly extends the bearing's service life under harsh road conditions.

[0029] 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.

[0030] 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 sealing structure for an automotive tapered wheel hub bearing, characterized in that: The system includes a hub flange (3), on which a bearing outer ring (2) is fitted. Between the bearing outer ring (2) and the hub flange (3), there is a pair of inner rings (10) arranged in a mirror image. Between the inner ring (10) and the bearing outer ring (2), there is a cage (7). Each cage (7) is provided with several tapered rollers (6) arranged in a ring. A multi-lip skeleton seal ring (9) is provided between the front end or both ends of the bearing outer ring (2) and the hub flange (3). The multi-lip skeleton seal ring (9) includes a skeleton ring (12) and a support ring (16). A seal ring (13) covering the skeleton ring (12) is provided on the skeleton ring (12). An axial main lip (15) and an axial secondary lip (14) are provided between the side of the seal ring (13) and the support ring (16). A radial main lip (17) and a radial secondary lip (18) are provided between the lower end of the seal ring (13) and the support ring (16).

2. The sealing structure of an automotive tapered wheel hub bearing according to claim 1, characterized in that: The inner ring (10) is nested with the hub flange (3), and the rear of the hub flange (3) is provided with a retaining ring (11) that limits the inner ring (10) and is nested with the hub flange (3) in a slot-like manner.

3. The sealing structure of an automotive tapered wheel hub bearing according to claim 1, characterized in that: The rear end of the hub flange (3) is provided with a sensor (1) that is inserted and fixed to the outer ring (2) of the bearing, and a toothed ring (5) is provided between the hub flange (3) and the sensor (1) that is nested and fixed to the hub flange (3).

4. The sealing structure of an automotive tapered wheel hub bearing according to claim 1, characterized in that: The hub flange (3) is provided with several bolts (4) arranged in an equally spaced ring and inserted through the hub flange (3).

5. The sealing structure of an automotive tapered wheel hub bearing according to claim 1, characterized in that: The hub flange (3) is provided with a lightweight groove (8) on its end face.

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