A hub bearing unit having an arc face helical tooth ring

Abstract

A kind of hub bearing unit with curved surface helical gear ring.The main problem of traditional hub bearing unit is the insufficient precision and stability of gear ring signal.The hub bearing unit with curved surface helical gear ring is characterized by: the gear ring includes a ring body (51) in a circular ring structure; a plurality of sensing teeth (52) are evenly distributed on the ring body, the angle c between the center line a of the sensing tooth and the center line b of the adjacent sensing tooth is 1°-3°, and the center line b of the adjacent sensing tooth passes through the center of the ring body.The hub bearing unit with curved surface helical gear ring provided by the utility model uses a slight angle to make the signal more stable, and the signal amplitude fluctuation rate is greatly suppressed from ≥25% of traditional flat tooth to ≤6%.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, specifically to a wheel hub bearing unit with an arc-shaped helical tooth ring. Background Technology

[0002] In the third-generation wheel hub bearing unit, the ABS sensor gear ring, which is interference-fitted with the inner flange journal, has long used a stamped L-shaped hollow flat gear structure. This structure, under the increasingly demanding requirements of vehicle performance, has revealed three fundamental flaws:

[0003] Insufficient signal accuracy and stability: The flat tooth structure has no ability to compensate for axial movement during bearing operation, resulting in large fluctuations in the amplitude of ABS sensor signals (usually ≥25%), which becomes the underlying bottleneck restricting the control accuracy of advanced driver assistance systems such as ESP and TCS.

[0004] Poor structural strength and reliability: The thin-walled structure and hollow tooth design of the L-shaped tooth result in weak overall rigidity. It is prone to deformation when subjected to interference fit force and tooth damage due to impact under harsh road conditions.

[0005] Poor assembly processability: The precision limitations (±0.1mm) and low rigidity of the stamped parts themselves make them prone to tilting when pressed into the journal, resulting in a high yield rate. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model provides a hub bearing unit with an arc-shaped helical tooth ring, which mainly solves the problem of insufficient accuracy and stability of the tooth ring signal in traditional hub bearing units.

[0007] The technical solution of this utility model is as follows:

[0008] A hub bearing unit with an arc-shaped helical gear ring includes a flange, an inner ring, and an outer ring. The inner ring is disposed on the flange. A cage is provided between the outer ring and the inner ring, and the cage has rolling balls. A sensing head is mounted on the outer ring, and a gear ring is mounted on the inner ring. The sensing head is disposed opposite to the gear ring. The gear ring includes...

[0009] The ring-shaped body has a circular structure.

[0010] A number of sensing teeth are evenly distributed on the ring body. The angle c between the center line a of the sensing teeth and the center line b of the adjacent sensing teeth is 1° to 3°. The center line b of the adjacent sensing teeth passes through the center of the ring body.

[0011] The side of the sensing tooth is curved.

[0012] The angle c between the centerline a of the sensing tooth and the centerline b of the adjacent sensing tooth is 3°.

[0013] The gear ring is manufactured using metal powder metallurgy.

[0014] The outer ring is provided with a mounting hole, and the sensing head includes a boss with a probe on the boss. The boss is engaged with the mounting hole.

[0015] The outer circumferential wall of the boss is provided with a groove, and a sealing ring is provided in the groove. The sealing ring is in a sealing fit with the inner wall of the mounting hole.

[0016] A skeleton oil seal is also provided between the outer ring and the inner ring.

[0017] The skeleton oil seal includes a skeleton installed on the outer wall of the outer ring, the skeleton is provided with a plurality of sealing lips, at least one of the sealing lips is in sealing engagement with the inner ring, and at least one sealing lip is in sealing engagement with the flange.

[0018] The beneficial effects of this utility model are: This utility model provides a hub bearing unit with an arc-shaped helical tooth ring, which uses a micro-hinged angle to make the signal more stable and significantly suppresses the signal amplitude fluctuation rate from ≥25% of the traditional flat tooth to ≤6%. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of one embodiment of the present invention.

[0020] Figure 2 This is a partial structural diagram of one embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of a gear ring according to an embodiment of the present invention.

[0022] Figure 4 for Figure 3 Enlarged diagram of point E in the middle.

[0023] Figure 5 for Figure 1 Enlarged diagram of point D in the middle. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. A hub bearing unit with an arc-shaped helical toothed ring includes a flange 1, an inner ring 2, and an outer ring 3. The inner ring is disposed on the flange. A cage 4 is provided between the outer ring and the inner ring. A ball 41 is provided on the cage. A sensing head 31 is installed on the outer ring. A toothed ring 5 is installed on the inner ring. The sensing head and the toothed ring are arranged opposite to each other. The toothed ring includes a ring body 51, which has a circular structure. A plurality of sensing teeth 52 are evenly distributed on the ring body. The angle c between the center line a of the sensing teeth and the center line b of the adjacent sensing teeth is 1° to 3°. The center line b of the adjacent sensing teeth passes through the center of the ring body.

[0025] Traditional flat-tooth sensors force the sensor to operate within a critical sensitive region of the magnetic field, making its signal quality extremely sensitive to micron-level axial runout, assembly tolerances, and thermal deformation. The 3° micro-hook angle employed in this design offers the fundamental advantage of reconstructing the magnetic field distribution on the tooth flank, transforming a sharp "magnetic cliff" into a gentle "magnetic slope." This shifts the sensor's sensing area from a binary critical point to a broad linear operating range. The direct result is a significant reduction in signal amplitude fluctuation from ≥25% for traditional flat-tooth sensors to ≤6%, providing the ABS / ESP system with a pure and stable source signal comparable to high-end sensors. This optimized 3° tilt angle is essentially a "system tolerance" design. It does not aim to completely eliminate macroscopic runout, but rather, by creating a smooth transition zone, greatly improves the system's tolerance to unavoidable variables (such as installation tolerances, manufacturing deviations, and high-frequency vibrations). This enables products to achieve extremely high quality consistency in mass production and exhibits outstanding robustness in the face of complex operating conditions throughout their life cycle, achieving a leap from "good enough" to "extremely reliable".

[0026] In this embodiment, as shown in the figure, the side surface of the sensing tooth is arc-shaped. The arc-shaped profile, through its streamlined design, eliminates the stress concentration ridge inherent in straight tooth profiles at the junction of the tooth root and side surface. This not only perfectly addresses press-fit stress but also increases the fatigue strength of the gear ring under impact and vibration loads by more than 40%, ensuring structural durability with the same lifespan as the wheel hub bearing body.

[0027] In this embodiment, as shown in the figure, the angle c between the center line a of the sensing tooth and the center line b of the adjacent sensing tooth is 3°.

[0028] In this embodiment, as shown in the figure, the gear ring is manufactured using metal powder metallurgy. Powder metallurgy offers high precision: the tooth profile manufacturing accuracy can reach ±0.03mm, and the internal hole tolerance is precisely controlled, ensuring the consistency of the interference fit.

[0029] In this embodiment, as shown in the figure, the outer ring is provided with a mounting hole 33, the sensing head includes a boss 311, a probe 312 is provided on the boss, and the boss is engaged with the mounting hole.

[0030] In this embodiment, as shown in the figure, the outer circumferential wall of the boss is provided with a groove, and a sealing ring 313 is provided in the groove. The sealing ring is in a sealing fit with the inner wall of the mounting hole. This prevents leakage and provides a better sealing effect.

[0031] In this embodiment, as shown in the figure, a skeleton oil seal 6 is also provided between the outer ring and the inner ring to enhance the sealing effect.

[0032] In this embodiment, as shown in the figure, the skeleton oil seal includes a skeleton 61 installed on the outer wall of the outer ring. The skeleton has a plurality of sealing lips 62, at least one of which is in sealing engagement with the inner ring, and at least one of which is in sealing engagement with the flange. This enhances the sealing effect.

[0033] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A hub bearing unit with an arc-shaped helical toothed ring, comprising a flange (1), an inner ring (2), and an outer ring (3), wherein the inner ring is disposed on the flange, a cage (4) is provided between the outer ring and the inner ring, the cage is provided with balls (41), a sensor (31) is mounted on the outer ring, and a toothed ring (5) is mounted on the inner ring, the sensor being disposed opposite to the toothed ring; characterized in that: The gear ring includes The ring body (51) has a circular structure; A number of sensing teeth (52) are evenly distributed on the ring body. The angle c between the center line a of the sensing tooth and the center line b of the adjacent sensing tooth is 1° to 3°. The center line b of the adjacent sensing tooth passes through the center of the ring body.

2. A hub bearing unit having an arc face bevelled ring gear according to claim 1, characterised in that: The side of the sensing tooth is curved.

3. A hub bearing unit having an arc face bevelled ring gear according to claim 1, characterised in that: The angle c between the centerline a of the sensing tooth and the centerline b of the adjacent sensing tooth is 3°.

4. A hub bearing unit having an arc face helical gear ring according to claim 1, characterized in that: The gear ring is manufactured using metal powder metallurgy.

5. A hub bearing unit having an arc face bevelled ring gear according to claim 1, characterised in that: The outer ring is provided with a mounting hole (33), the sensing head includes a boss (311), a probe (312) is provided on the boss, and the boss is engaged with the mounting hole.

6. A hub bearing unit having an arc face skew tooth rim according to claim 5, characterized in that: The outer circumferential wall of the boss is provided with a groove, and a sealing ring (313) is provided in the groove. The sealing ring is sealed and fitted with the inner wall of the mounting hole.

7. A hub bearing unit having an arc face conical toothing rim according to any one of claims 1 to 6, characterized in that: A skeleton oil seal (6) is also provided between the outer ring and the inner ring.

8. A hub bearing unit having an arc face skew tooth rim according to claim 7, characterized in that: The skeleton oil seal includes a skeleton (61) installed on the outer wall of the outer ring, and the skeleton is provided with a plurality of sealing lips (62), at least one of the sealing lips is in sealing engagement with the inner ring, and at least one sealing lip is in sealing engagement with the flange.

Images