End face spline type hub bearing
Through the design of end-face spline type hub bearings, the problems of difficult assembly, poor reliability and low torque transmission efficiency of traditional hub bearings are solved, and efficient torque transmission, improved NVH performance and lightweight effects are achieved.
Patent Information
- Application Number
- CN202422408438.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-30
AI Technical Summary
Traditional hub bearings are difficult to assemble internal and external splines, have high manufacturing costs, poor reliability, low torque transmission efficiency and have problems with abnormal driving noise.
The end-face spline type hub bearing is adopted, and the end-face spline teeth and flange bolts are connected, and the tooth angle, the edge angle and the tooth radial dimensional relationship is designed to achieve the effective contact area of the tooth surface, and the self-centered guide is achieved through the angle design of the round table and the center line of the end-face spline teeth.
It improves driving torque, improves the NVH performance of the entire vehicle, simplifies the assembly and disassembly process, reduces the weight of the hub bearing, achieves lightweight, and eliminates driving clearance and abnormal noise.
Smart Images
Figure CN223049252U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of hub bearings, and particularly to an end-face spline type hub bearing. Background Art
[0002] A hub bearing is an automotive component that bears weight and provides precise guidance for the rotation of the hub. With the rapid development of the automotive industry, traditional hub bearings have been gradually phased out due to the difficulties in assembling internal and external splines, high manufacturing costs, poor reliability, low torque transmission efficiency, and problems such as driving abnormal noises. Currently, there is an urgent need for a new hub bearing unit structure with rationalized assembly process, lightweight, and miniaturization. Content of the Utility Model
[0003] The utility model aims to overcome the deficiencies existing in the prior art and provides an end-face spline type hub bearing, which has the advantages of compact structure, high installation accuracy, long service life, smooth power transmission, good sealing performance, and excellent safety performance.
[0004] To achieve the above purpose, the utility model adopts the following technical scheme: An end-face spline type hub bearing includes an outer ring of the hub bearing, a flange inner ring, and a drive shaft. The left end of the flange inner ring is provided with a curled edge, and a small inner ring is positioned and installed on the left side of the flange inner ring through the curled edge. An outer raceway is provided between the root of the flange disk journal of the flange inner ring and the outer ring, and together with the inner raceway arranged between the small inner ring and the outer ring, it forms a double-row raceway. Steel balls and a cage are arranged in the raceway. A flange end-face spline is provided on the left end face of the flange inner ring, and a shaft end-face spline that meshes with the flange end-face spline is provided on the right end face of the drive shaft. The included angle α0 between the center line of the meshing of the flange end-face spline and the shaft end-face spline and the axis is 74.58°. A middle hole is provided at the center of the middle part of the right end of the drive shaft, and an internal thread is provided on the wall of the middle hole. A stepped hole is provided at the right end of the flange inner ring, and a flange bolt connected to the middle hole is inserted through the stepped hole. The head of the flange bolt is integrally formed with a flat pressure plate that contacts the stepped surface. The tooth profile angle α1 of both the shaft end-face spline teeth and the flange end-face spline teeth is 27.5°, and a chamfer angle α2 of 17° is provided at the tooth root of both the shaft end-face spline teeth and the flange end-face spline teeth.
[0005] Preferably, as an improvement, 4 - 5 longitudinal raceways in the spherical surface middle hole on one side of the drive shaft are connected to a constant velocity joint device; the other side end face is processed into annular shaft end-face spline teeth for directly connecting to the flange end-face spline and forming the meshing of the end-face teeth. The radial dimension of the shaft end-face spline teeth is smaller than that of the flange end-face spline teeth.
[0006] Preferably, as an improvement, a groove is provided at the middle part of the right end of the drive shaft and inside the shaft end-face spline. A round platform protruding towards the right is provided at the center of the groove, and the middle hole is concentrically arranged in the middle of the round platform. The outer conical surface of the round platform plays a role of central alignment in the connection of the end-face spline.
[0007] Preferably, as an improvement, the end faces of the flange end face spline and the shaft end face spline are both flat surfaces.
[0008] The principle and advantages of this solution are as follows: In practical applications, the hub bearing and the drive shaft are connected through the end face spline teeth and the flange bolts. The end face spline tooth structure is designed by considering the tooth profile angle, the relief angle, the relationship of the radial dimensions of the tooth profile, etc., so as to eliminate the interference of the tooth root and the tooth tip during meshing when the shaft end face spline meshes with the flange end face spline, and ensure the effective contact area of the tooth profile surface. The design of the round table on the drive shaft and the angle α0 between the center line of the end face spline teeth and the axis enables the center alignment to be completed automatically during the connection process of the end face spline, ensuring the connection accuracy and reliability between the hub bearing and the drive shaft.
[0009] In this end face spline drive structure, the hub bearing and the drive shaft are connected through the end spline teeth, and are used as a transmission device to transmit torque, improving the drive torque. Compared with the existing internal and external spline transmissions, the drive torque is significantly increased, effectively improving the vehicle's NVH performance, enhancing the convenience of assembly and disassembly during the vehicle production and maintenance processes, reducing the weight of the hub bearing, achieving lightweight, and the hub bearing with end face spline teeth can effectively eliminate the drive clearance and eliminate the drive abnormal noise. Description of the Drawings
[0010] Figure 1 is a longitudinal sectional view of an embodiment of the present invention.
[0011] Figure 2 is an assembly schematic diagram of an embodiment of the present invention.
[0012] Figure 3 is a tooth profile diagram of the end face spline teeth in an embodiment of the present invention. Detailed Description of the Invention
[0013] The following is a further detailed description through specific embodiments:
[0014] The reference numerals in the accompanying drawings of the specification include: drive shaft 1, groove 2, flange end face spline 3, crimp 4, small inner ring 5, outer ring 6, round table 7, stepped hole 8, pressure plate 9, flange bolt 10, flange inner ring 11, outer seal 12, steel ball 13, inner seal 14, shaft end face spline 15, middle hole 16, tooth profile angle α1, relief angle α2.
[0015] The embodiment is basically as shown in the attached Figure 1 、 Figure 2As shown: An end face spline type hub bearing includes an outer ring 6 of the hub bearing, a flange inner ring 11, and a drive shaft 1. The left end of the flange inner ring 11 has a curled edge 4. A small inner ring 5 is positioned and installed on the left side of the flange inner ring 11 through the curled edge 4. An outer raceway is provided between the root of the flange disc journal of the flange inner ring 11 and the outer ring 6, and together with the inner raceway provided between the small inner ring 5 and the outer ring 6, it forms a double-row raceway. Steel balls 13 and a cage are provided in the raceway. An outer seal 12 is provided outside the outer raceway, and an inner seal 14 is provided inside the inner raceway. An annular flange end face spline 3 is provided on the left end face of the flange inner ring 11. Four to five longitudinal raceways in the spherical middle hole 16 on the left side of the drive shaft 1 are connected to a constant velocity joint device. The right end face is machined into an annular shaft end face spline 15 for directly connecting to the flange end face spline 3 and forming the meshing of end face teeth. The included angle α0 between the center line of the meshing of the flange end face spline 3 and the shaft end face spline 15 and the axis is 74.58°. Combining Figure 3 As shown, the tooth profile angle α1 of the teeth of the shaft end face spline 15 and the flange end face spline 3 is 27.5°. A chamfer angle α2 of 17° is provided at the tooth root of the teeth of the shaft end face spline 15 and the flange end face spline 3. The radial dimension of the teeth of the shaft end face spline 15 is smaller than that of the teeth of the flange end face spline 3. The end faces of the flange end face spline 3 and the shaft end face spline 15 are both flat. A middle hole 16 is provided at the center of the middle part of the right end of the drive shaft 1. The inner wall of the middle hole 16 has an internal thread. A groove 2 is provided at the middle part of the right end of the drive shaft 1 inside the shaft end face spline 15. A round table 7 protruding to the right is provided at the center of the groove 2. The middle hole 16 is concentrically arranged in the middle of the round table 7. The outer conical surface of the round table 7 plays a role of central alignment in the end face spline connection.
[0016] The specific implementation process is as follows: In actual application, the hub bearing is connected to the drive shaft 1 through end face spline teeth and flange bolts 10. The end face spline tooth structure is designed by considering the tooth profile angle α1, chamfer angle α2, tooth profile radial dimension relationship, etc., so that when the shaft end face spline 15 meshes with the flange end face spline 3, the interference at the tooth root and tooth tip during meshing is eliminated, and a gap of 0.05 mm is formed between the tooth root and the tooth tip to ensure the effective contact area of the tooth profile surface. The design of the round table 7 on the drive shaft 1 and the included angle α0 between the center line of the end face spline teeth and the axis enables the central alignment to be completed automatically during the end face spline connection, ensuring the connection accuracy and reliability between the hub bearing and the drive shaft 1.
[0017] For this end face spline drive structure, the hub bearing and the drive shaft 1 are connected through end spline teeth and used as a transmission device to transmit torque, enhancing the drive torque. Compared with the existing internal and external spline transmissions, the drive torque is significantly increased, effectively improving the vehicle's NVH performance, enhancing the convenience of assembly and disassembly during vehicle production and maintenance, reducing the weight of the hub bearing to achieve lightweighting, and the hub bearing with end face spline teeth can effectively eliminate the drive clearance and drive noise.
[0018] The above are only embodiments of the present invention, and specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.
Claims
1. A face spline wheel hub bearing, characterized in that: It includes the outer ring of the hub bearing, the inner ring of the flange, and the drive shaft. The left end of the inner ring of the flange is provided with a curling edge, and a small inner ring is positioned and installed on the left side of the inner ring of the flange through the curling edge. An outer raceway is arranged between the flange journal root of the inner ring of the flange and the outer ring, and a double-row raceway is formed with the inner raceway arranged between the small inner ring and the outer ring. Steel balls and retainers are arranged in the raceway. A flange end face spline is arranged on the left end face of the inner ring of the flange, and a shaft end face spline meshing with the flange end face spline is arranged on the right end face of the drive shaft. The angle between the center line meshing with the shaft end face spline and the axis is 74.58°. A center hole is provided in the center of the right end of the drive shaft, and an internal thread is provided on the wall of the center hole. A step hole is provided on the right end of the inner ring of the flange, and a flange bolt connected to the center hole is passed through the step hole. A flat pressure plate in contact with the step surface is integrally formed on the head of the flange bolt. The tooth profile angle α1 of the shaft end face spline teeth and the flange end face spline teeth are both 27.5°, and a trim angle α2 of 17° is provided at the tooth root of the shaft end face spline teeth and the flange end face spline teeth.
2. The end face spline type wheel hub bearing according to claim 1, characterized in that: 4-5 longitudinal raceways in the hole on the spherical surface of one side of the drive shaft are connected to the ball cage device; the end face of the other side is processed into a ring-shaped shaft end face spline tooth for directly connecting to the flange end face spline and forming mutual meshing of the end face teeth, and the radial dimension of the shaft end face spline tooth is smaller than the radial dimension of the flange end face spline tooth.
3. The end face spline type wheel hub bearing according to claim 2, characterized in that: A groove is provided in the middle of the right end of the drive shaft, which is located inside the shaft end face spline. A truncated cone protruding to the right is provided in the center of the groove. The center hole is concentrically arranged in the middle of the truncated cone. The outer conical surface of the truncated cone plays a center guiding role in the end face spline connection.
4. The end face spline type wheel hub bearing according to claim 3, characterized in that: The end faces of flange end splines and shaft end splines are both flat.