High-strength three-fork bearing structure

Abstract

The utility model discloses a high-strength three-fork bearing structure which comprises a three-pivot shaft, a shaft head is arranged in an inner cavity of a roller, a connecting hole is formed in the three-pivot shaft, and an inner spline is arranged on the inner wall of the three-pivot shaft; in the internal splines, the spline close to the shaft heads is a neck spline, and the spline between the two shaft heads is a shoulder spline; the neck spline and the shoulder spline are directly connected or connected through a connecting spline; a plurality of spline teeth are uniformly distributed on the neck spline and the shoulder spline; the connecting spline is of a combined spline tooth structure or a canceled spline tooth structure. According to the high-strength three-fork bearing structure provided by the utility model, the structure of the neck spline of the three-fork bearing is improved, so that the strength of the neck spline of the three-fork bearing is increased, the shaft neck is prevented from being cracked due to large stress, the strength of the three-fork bearing is further improved, and the service life of the three-fork bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of three pivots, in particular to a high-strength tripod bearing structure. Background Art

[0002] The automotive sliding constant velocity joint is one of the core components of the automotive chassis drive system, and the three-pivot shaft is an important component on the mobile constant velocity joint. It is the main component that affects the strength and life of the drive shaft. With the continuous expansion of the new energy vehicle market, the requirements for strength and life are becoming more and more stringent.

[0003] In the prior art, the invention patent with patent number CN201910655365.0 discloses a high-strength and compact three-pivot universal joint, which includes three pivots and rollers. The shaft heads on the three pivots are rotatably placed in the inner cavity of the rollers. The inner walls of the three pivots are provided with internal splines. The ratio of the outer diameter of the roller to the diameter of the roller's distribution circle is 0.915 to 0.935; the ratio of the width of the roller to the outer diameter of the roller is 0.21 to 0.25; and the ratio of the platform height of the three pivots to the major diameter of the internal spline is 0.55 to 0.65. This invention patent adjusts the relevant dimensions of the internal components of the three-pivot universal joint. Without changing the maximum outer diameter of the external components of the universal joint, it improves the strength of the original weak components and makes the internal components more compact, thereby meeting the high strength requirements of electric vehicles and improving the comfort of electric vehicles.

[0004] However, the existing three-pivot still has certain defects. The existing sliding constant velocity universal joint is composed of a sliding sleeve and a tripod bearing. The tripod bearing can slide in the sliding sleeve. During the movement of the sliding constant velocity universal joint, the tripod bearing splines rotate in coordination with the shaft splines. During the torsional fatigue strength test, the tripod bearing is prone to breakage at the root of the neck splines. A tripod bearing structure with improved strength and life is needed. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a high-strength tripod bearing structure. By improving the structure of the tripod bearing neck spline, the strength of the tripod bearing neck spline is increased, avoiding cracking of the shaft neck due to high force, thereby improving the strength and life of the tripod bearing.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a high-strength three-pronged bearing structure, including three pivots, the three pivots including a shaft body and a shaft head, the shaft head is placed in the inner cavity of the roller, a connecting hole is opened in the three pivots, and an internal spline is provided on the inner wall of the three pivots; among the internal splines, the part close to the shaft head is the neck spline, and the part between the two shaft heads is the shoulder spline; the neck spline and the shoulder spline are directly connected to each other or connected through a connecting spline; a number of key teeth are evenly distributed on the neck spline and the shoulder spline; the connecting spline is a combined key tooth structure or a key tooth structure is cancelled.

[0007] Furthermore, at least one of the two sides of the neck spline corresponding to each shaft head is connected to the shoulder spline through the connecting spline.

[0008] Furthermore, both sides of the neck spline corresponding to each shaft head are connected to the shoulder spline through the connecting spline.

[0009] Furthermore, the merged key tooth structure is formed by merging at least two adjacent key teeth, and in the merged key tooth structure, the tooth valleys between adjacent key teeth are filled; and the height of the merged key tooth structure is the same as the tooth peak height of the key teeth.

[0010] Furthermore, the cancelling key tooth structure is formed by eliminating at least two adjacent key teeth, and in the cancelling key tooth structure, the tooth peaks of the key teeth are eliminated; the height of the cancelling key tooth structure is the same as the tooth valley height of the key teeth.

[0011] Furthermore, the arc of the connecting spline is in the range of 10.3° to 20.6°.

[0012] The beneficial effect of the present invention is that compared with the prior art, the present invention provides a high-strength tripod bearing structure. When the universal joint swings during movement, the stress at the easily breakable part of the inner spline neck is dispersed due to the design of merging the key tooth structure on both sides of the neck spline or canceling the key tooth structure, thereby increasing the neck spline strength of the tripod bearing and improving the strength and life of the tripod bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the tripod bearing structure provided in Example 1.

[0014] Figure 2 This is a schematic structural diagram of the internal spline in the tripod bearing structure provided in Example 1.

[0015] Figure 3 This is a schematic structural diagram of the tripod bearing structure provided in Example 2.

[0016] Figure 4This is a schematic structural diagram of the internal spline in the tripod bearing structure provided in Example 2.

[0017] Among them, 1-shaft head; 2-roller; 3-three-pivot; 4-merged key tooth structure; 5-neck spline; 6-shoulder spline; 7-tooth peak; 8-tooth valley; 9-connecting hole; 10-cancelled key tooth structure. DETAILED DESCRIPTION

[0018] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0019] Example 1

[0020] like Figure 1 and 2 As shown, a high-strength three-prong bearing structure includes a three-pivot shaft 3, which comprises a shaft body and a shaft head 1. The shaft head 1 is placed in the inner cavity of a roller 2. A connecting hole 9 is formed in the three-pivot shaft 3, and an internal spline is provided on the inner wall of the three-pivot shaft 3. The internal spline is located near the shaft head 1 as a neck spline 5, and between the two shaft heads 1 as a shoulder spline 6. Both sides of the neck spline 5 corresponding to each shaft head 1 are connected to the shoulder spline 6 via the connecting spline. Several teeth are evenly distributed on the neck spline 5 and the shoulder spline 6. The connecting spline is a combined tooth structure 4, of which there are six. The combined tooth structure 4 is formed by merging two adjacent teeth. The valley 8 between the adjacent teeth is filled in. The height of the combined tooth structure 4 is the same as the height of the tooth peak 7 of the teeth. The arc of the combined tooth structure 4 ranges from 10.3° to 20.6°.

[0021] When the universal joint swings during movement, the splines inside the tripod bearing rotate in coordination with the shaft splines. During the torsional fatigue strength test, the stress on the four combined key tooth structures on both sides of the neck spline is dispersed compared to the ordinary key tooth structure, thereby increasing the strength of the neck spline of the tripod bearing and improving the strength and life of the tripod bearing.

[0022] Example 2

[0023] like Figure 3 and 4As shown, a high-strength three-prong bearing structure includes a three-pivot shaft 3, which includes a shaft body and a shaft head 1. The shaft head 1 is placed in the inner cavity of the roller 2. A connecting hole 9 is formed in the three-pivot shaft 3, and an internal spline is provided on the inner wall of the three-pivot shaft 3. The internal spline is located near the shaft head 1 as a neck spline 5, and between the two shaft heads 1 as a shoulder spline 6. One side of the neck spline 5 corresponding to each shaft head 1 is connected to the shoulder spline 6 via the connecting spline. Several key teeth are evenly distributed on the neck spline 5 and the shoulder spline 6. The connecting spline is a canceled key tooth structure 10, and there are three canceled key tooth structures 10, each of which is evenly distributed on the internal spline. The canceled key tooth structure 10 is formed by eliminating two adjacent key teeth. In the canceled key tooth structure 10, the tooth peak 7 of the key tooth is eliminated, and the height of the canceled key tooth structure 10 is the same as the tooth valley 8 of the key tooth. The arc of the cancellation key tooth structure 10 is in the range of 10.3° to 20.6°.

[0024] When the universal joint swings during movement, the two adjacent teeth at the junction of the tripod bearing shaft neck spline and the shoulder spline are eliminated. Therefore, when conducting a torsional fatigue test, the force at the position where the key tooth structure 10 is eliminated is small, which can avoid cracking of the shaft neck due to high force, thereby increasing the strength of the tripod bearing neck spline, and improving the strength and life of the tripod bearing.

[0025] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the scope of patent protection of the present invention shall be defined by the claims.

Claims

1. A high-strength three-prong bearing structure, comprising three pivots, each comprising a shaft body and a shaft head, the shaft head being disposed in the inner cavity of a roller, a connecting hole being formed in the three pivots, and an internal spline being provided on the inner wall of the three pivots; characterized in that: In the internal spline, the part close to the shaft head is the neck spline, and the part between the two shaft heads is the shoulder spline; the neck spline and the shoulder spline are directly connected or connected through a connecting spline; a number of key teeth are evenly distributed on the neck spline and the shoulder spline; the connecting spline is a combined key tooth structure or a cancelled key tooth structure.

2. A high-strength tripod bearing structure according to claim 1, characterized in that: At least one side of the two sides of the neck spline corresponding to each shaft head is connected to the shoulder spline through the connecting spline.

3. A high-strength tripod bearing structure according to claim 2, characterized in that: Both sides of the neck spline corresponding to each shaft head are connected to the shoulder spline through the connecting spline.

4. A high-strength tripod bearing structure according to claim 1, characterized in that: The merged key tooth structure is formed by merging at least two adjacent key teeth. In the merged key tooth structure, the tooth valleys between the adjacent key teeth are filled; the height of the merged key tooth structure is the same as the tooth peak height of the key teeth.

5. The high-strength tripod bearing structure according to claim 1, characterized in that: The cancelling key tooth structure is formed by eliminating at least two adjacent key teeth. In the cancelling key tooth structure, the tooth peaks of the key teeth are eliminated; the height of the cancelling key tooth structure is the same as the tooth valley height of the key teeth.

6. The high-strength tripod bearing structure according to claim 1, characterized in that: The arc angle of the connecting spline is in the range of 10.3° to 20.6°.

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