Vehicle bearing and bearing raceway structure thereof

Abstract

The utility model relates to the technical field of bearings, in particular to a vehicle bearing raceway structure which comprises a raceway part and a shoulder part, the raceway part and the shoulder part are arranged at a corner, the raceway part comprises an arc section and a linear section in the circumferential direction of a ball, the linear section is located between the arc section and the shoulder part, and the shoulder part is located between the arc section and the shoulder part. The angle between the tangent line, located at the intersection point of the straight line section and the arc section, of the ball and the straight line section is larger than or equal to 0 degree and smaller than or equal to 10 degrees. By adopting the technical scheme, the raceway part is divided into the arc section and the linear section, and the arc section is far away from a ball quadrant point through the arrangement of the linear section, so that the problem of stress concentration is relieved; meanwhile, by controlling the angle of the linear section, the supporting effect can be achieved when the balls and the arc section are pressed and deformed, and therefore excessive stress concentration can be further avoided through compensation.

Description

Technical Field

[0001] The present application relates to the technical field of bearings, and in particular to a vehicle bearing and a bearing raceway structure thereof. Background Art

[0002] In modern automobile design, the wheel hub unit is a key component that bears the weight of the vehicle body and transmits power. The reliability of its performance is crucial to ensure the safety and driving experience of the vehicle. The bearings in the wheel hub unit play an important role in the vehicle steering process. However, the bearings often face a key problem in practical applications - stress concentration.

[0003] For example, Chinese patent publication number CN1837630A discloses a wheel hub bearing unit for a motor vehicle wheel, in which a bearing unit is mounted around a tubular portion and has a set of double-row balls radially located between a stationary outer bearing race and two inner bearing races, the outer bearing race forming an outer raceway, and the two inner bearing races are adjacent to each other and form an inner raceway.

[0004] Specifically, stress concentration refers to the axial force generated on the bearing due to the sudden change of torque and load during the vehicle steering process. In order to ensure that there is sufficient contact area between the raceway surface and the ball on the inner and outer rings of the bearing, the existing bearing design usually places the contact surface between the raceway surface and the shaft ball close to the end point of the ball along the axial direction of the bearing. This design results in more concentrated stress at the position closer to the end point.

[0005] In the prior art, this stress concentration phenomenon has the following adverse effects:

[0006] 1. Accelerated bearing wear: Since the stress concentration area is subjected to excessive stress, the wear between the bearing raceway surface and the ball will increase, thereby shortening the service life of the bearing.

[0007] 2. Causing premature failure of bearings: Excessive stress concentration may cause fatigue damage to the internal structure of the bearing, leading to premature failure of the bearing, which in turn affects the safety and driving experience of the vehicle.

[0008] 3. Increased maintenance costs: Premature bearing failure means more frequent replacement and repair, which not only increases maintenance costs but may also affect the normal operation of the vehicle.

[0009] In order to solve this problem, it is necessary to optimize the existing bearing design, reduce stress concentration, and thus improve the performance and reliability of the bearing. Utility Model Content

[0010] In order to improve the safety and driving experience of a vehicle during steering, the present application provides a vehicle bearing and a bearing raceway structure thereof.

[0011] On the one hand, the present application provides a vehicle bearing raceway structure, which adopts the following technical solution:

[0012] A vehicle bearing raceway structure comprises a raceway portion and a shoulder portion, wherein a corner is arranged between the raceway portion and the shoulder portion, wherein the raceway portion comprises an arc segment and a straight segment along the circumferential direction of a ball, wherein the straight segment is located between the arc segment and the shoulder portion, and wherein an angle between a tangent line of the ball located at an intersection of the straight segment and the arc segment and the straight segment is arranged to be greater than or equal to 0 degrees and less than or equal to 10 degrees.

[0013] By adopting the above technical solution, when the vehicle turns, the wheel hub bearing will bear the axial force. At this time, the ball mainly generates force with the area near the shoulder of the raceway, and the closer the area is to the ball quadrant point, the more concentrated the stress is. The reason is that the closer it is to the ball quadrant point, the more it tends to be tangent to the ball. Therefore, the raceway is divided into arc segments and straight segments. The straight segment is set to make the arc segment away from the ball quadrant point, thereby alleviating the problem of stress concentration; at the same time, by controlling the angle of the straight segment, it can also play a supporting effect when the ball and the arc segment are deformed under pressure, so that excessive stress concentration can be further avoided through compensation.

[0014] In one embodiment, the arc angle of the arc segment is greater than or equal to 70 degrees and less than or equal to 80 degrees.

[0015] By adopting the above technical solution, the arc angle of the arc segment determines the contact area between the arc segment and the ball. A setting greater than or equal to 70 degrees can avoid the contact area being too small, while a setting less than or equal to 80 degrees is to control the position of the straight line segment to ensure that it can achieve the corresponding effect.

[0016] In one embodiment, the angle formed by the two ends of the raceway portion and the center of the ball is less than 90 degrees.

[0017] By adopting the above technical solution, when the raceway portion is too long, it will lead to increased production difficulty and the problem of being unable to assemble.

[0018] In one embodiment, the angle formed by the two ends of the raceway portion and the center of the ball is greater than or equal to 84 degrees and less than or equal to 86 degrees.

[0019] By adopting the above technical solution, it is ensured that there is enough length to ensure the contact area with the ball, while at the same time it is not too long to cause problems such as excessive stress concentration or inability to install.

[0020] In one embodiment, one end of the straight line segment away from the arc segment is located in the area formed between two adjacent quadrant points on the ball.

[0021] By adopting the above technical solution, the length can be controlled by controlling the endpoints. Since the angle of the straight line segment is very small and tends to be vertical, if the length is too long, the difficulty of grinding will increase.

[0022] In one embodiment, one end of the arc segment away from the straight line segment is located at the quadrant point of the ball.

[0023] By adopting the above technical solution, the arc segment can be set to be the longest without changing the position of the straight segment, thereby ensuring the maximum contact area with the ball.

[0024] On the other hand, the present application provides a vehicle bearing, which adopts the following technical solution:

[0025] A vehicle bearing comprises a bearing inner ring and a bearing outer ring, both of which are provided with the above-mentioned bearing raceway structure.

[0026] In one embodiment, the bearing raceway structures on the bearing inner ring and the bearing outer ring are symmetrically arranged around the center of the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a vehicle bearing in this embodiment;

[0028] Figure 2 Schematic diagram of the bearing raceway structure in this embodiment.

[0029] In the figure, 100, inner ring of the bearing; 200, outer ring of the bearing; 300, raceway portion; 310, arc segment; 320, straight line segment; 400, shoulder portion; 500, ball. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0032] A vehicle bearing, such as Figure 1 As shown, it includes a bearing inner ring 100 and a bearing outer ring 200 , and a bearing raceway structure is provided on the bearing inner ring 100 and the bearing outer ring 200 .

[0033] The bearing raceway structure includes a raceway portion 300 and a shoulder portion 400, and a corner is arranged between the raceway portion 300 and the shoulder portion 400. Figure 2 The angle α formed between the two ends of the raceway portion 300 and the center of the ball 500 is less than 90 degrees. Preferably, the angle α formed between the two ends of the raceway portion 300 and the center of the ball 500 is greater than or equal to 84 degrees and less than or equal to 86 degrees.

[0034] See attached Figure 2 The raceway portion 300 includes an arc segment 310 and a straight segment 320 along the circumferential direction of the ball 500. For easy distinction, the arc segment 310 is represented by a red line and the straight segment 320 is represented by a green line in the figure.

[0035] The straight line segment 320 is located between the arc segment 310 and the shoulder 400. Since there are both a bearing inner ring 100 and a bearing outer ring 200 in the figure, there are a raceway portion 300 and a shoulder 400 of the bearing inner ring 100 and a raceway portion 300 and a shoulder 400 of the bearing outer ring 200. In this embodiment, no specific distinction is made between them, and they are collectively referred to as the raceway portion 300 and the shoulder 400.

[0036] The straight segment 320 is inclined toward the outside of the ball 500 at the intersection of the straight segment 320 and the arc segment 310, so that the tangent of the ball 500 at the intersection of the straight segment 320 and the arc segment 310 is set at an angle γ with the straight segment 320, wherein the angle γ is greater than or equal to 0 degrees and less than or equal to 10 degrees.

[0037] The arc angle β of the arc segment 310 is set to be greater than or equal to 70 degrees and less than or equal to 80 degrees.

[0038] For the convenience of explanation, the quadrant points of the ball 500 are represented by ABCD, and in order to make the intersection of the straight line segment 320 and the arc segment 310 as far away from the quadrant point of the ball 500 as possible, one end of the straight line segment 320 away from the arc segment 310 is located in the area formed between two adjacent quadrant points on the ball 500. Specifically, the straight line segment 320 of the bearing inner ring 100 is between two adjacent quadrant points C and D, and the straight line segment 320 of the bearing outer ring 200 is between two adjacent quadrant points A and B.

[0039] At the same time, in order to ensure that the arc segment 310 is set to be the longest, the end of the arc segment 310 away from the straight segment 320 is located at the quadrant point of the ball 500. Specifically, the end of the arc segment 310 of the bearing inner ring 100 is located at the quadrant point C, and the end of the arc segment 310 of the bearing outer ring 200 is located at the quadrant point A.

[0040] In addition, the bearing raceway structures on the bearing inner ring 100 and the bearing outer ring 200 are symmetrically arranged around the center of the ball 500.

[0041] In addition, it should be noted that when the minimum distance between the plane where the shoulder 400 is located and the end point of the raceway portion 300 away from the shoulder 400 is less than the radius of the ball 500, Figure 2 When the bearing raceway structure on the inner ring 100 of the middle bearing is used, the corner where the straight portion and the shoulder 400 are located can be designed with a small chamfer, which can be a right angle or a rounded chamfer.

[0042] When the minimum distance between the plane where the shoulder 400 is located and the end point of the raceway portion 300 away from the shoulder 400 is greater than the radius of the ball 500, it is Figure 2 When the bearing raceway structure on the outer ring 200 of the middle bearing is formed, the corner between the straight portion and the shoulder 400 needs to be designed with a large right-angle chamfer, so as to reduce the length of the straight section 320 by the large right-angle chamfer.

[0043] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vehicle bearing raceway structure, comprising a raceway portion (300) and a shoulder portion (400), wherein a corner is provided between the raceway portion (300) and the shoulder portion (400), wherein: The raceway portion (300) comprises an arc segment (310) and a straight segment (320) along the circumferential direction of the ball (500); the straight segment (320) is located between the arc segment (310) and the shoulder (400); and the angle between the tangent of the ball (500) at the intersection of the straight segment (320) and the arc segment (310) and the straight segment (320) is greater than or equal to 0 degrees and less than or equal to 10 degrees.

2. The vehicle bearing raceway structure according to claim 1, characterized in that: The arc angle of the circular arc segment (310) is set to be greater than or equal to 70 degrees and less than or equal to 80 degrees.

3. The vehicle bearing raceway structure according to claim 1 or 2, characterized in that: The angle formed by the two ends of the raceway portion (300) and the center of the ball (500) is less than 90 degrees.

4. The vehicle bearing raceway structure according to claim 3 is characterized in that: The angle formed by the two ends of the raceway portion (300) and the center of the ball (500) is greater than or equal to 84 degrees and less than or equal to 86 degrees.

5. The vehicle bearing raceway structure according to claim 4, characterized in that: One end of the straight line segment (320) away from the arc segment (310) is located in a region formed between two adjacent quadrant points on the ball (500).

6. The vehicle bearing raceway structure according to claim 5, characterized in that: One end of the arc segment (310) away from the straight segment (320) is located at the quadrant point of the ball (500).

7. A vehicle bearing, comprising a bearing inner ring (100) and a bearing outer ring (200), characterized in that: The bearing inner ring (100) and the bearing outer ring (200) are both provided with the bearing raceway structure described in claim 1.

8. The vehicle bearing according to claim 7, characterized in that: The bearing raceway structures on the bearing inner ring (100) and the bearing outer ring (200) are symmetrically arranged around the center of the ball (500).

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