Thrust ball bearing with self-aligning function

Abstract

A thrust ball bearing with aligning function, which parts include shaft ring, seat ring, steel ball, retainer. The shaft ring is circular ring structure, and the raceway is eccentric convex spherical surface; the seat ring is circular ring structure, the outer raceway surface is plane, the middle part of the raceway surface is annular concave spherical surface groove matched with the curvature of the steel ball, the rotation axis of the annular concave spherical surface groove is coaxial with the rotation axis of the seat ring, the inner raceway surface of the seat ring is plane, which has height difference with the outer raceway surface of the seat ring, and the inner raceway surface of the seat ring is lower than the outer raceway surface of the seat ring; the retainer is circular ring structure, the thickness of the inner diameter side is less than the thickness of the outer diameter side, the lower end surface is plane, the outer side of the upper end surface is plane, and the inner side of the upper end surface of the retainer is annular concave spherical surface matched with the raceway of the shaft ring. The thrust ball bearing with aligning function designed by the application has the advantages of low friction, high rotating speed, automatic compensation of misalignment error of shaft, and allowing to bear radial load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, and mainly relates to a thrust ball bearing with aligning function. BACKGROUND

[0002] The existing thrust ball bearing includes a shaft ring, a seat ring, a steel ball and a retainer, the shaft ring and the seat ring have a groove-shaped raceway matched with the curvature of the steel ball, the retainer is usually made of punched steel plate, nylon or brass material, can only bear pure axial load, and is limited by the structural design, the current thrust ball bearing with a flat seat ring cannot bear any alignment error between the shaft and the bearing seat or the angle error between the supporting surface in the bearing seat and the shaft, but the alignment error between the shaft and the bearing seat and the angle error actually exist generally, therefore, in the actual application of the thrust ball bearing with a flat seat ring, the thrust ball bearing inevitably bears uneven force due to the alignment error between the shaft and the bearing seat, and the bearing is prematurely damaged; the designed thrust ball bearing cannot bear any radial load, and the radial load cannot be completely avoided in the actual application. SUMMARY

[0003] The present application aims to provide a thrust ball bearing with aligning function, the maximum relative inclination angle between the inner and outer rings can reach 5°, the internal structure is changed so that the thrust ball bearing can bear certain radial load, and the thrust ball bearing has the advantages of low friction, high rotating speed, automatic compensation of misalignment of the shaft, and allowance of bearing radial load.

[0004] The present application can be achieved by the following technical scheme: the thrust ball bearing includes a shaft ring, a seat ring, a steel ball and a retainer.

[0005] The shaft ring is a circular ring structure, and the shaft ring raceway is an eccentric convex spherical surface; the seat ring is a circular ring structure, the outer raceway surface of the seat ring is a plane, the middle part of the raceway surface is an annular concave spherical surface groove matched with the curvature of the steel ball, the annular concave spherical surface groove has a coaxial axis with the rotation axis of the seat ring, the ratio of the curvature radius of the annular concave spherical surface groove of the seat ring to the steel ball is 1.02-1.04, the inner raceway surface of the seat ring is a plane, and has a height difference with the outer raceway surface of the seat ring, the inner raceway surface of the seat ring is lower than the outer raceway surface of the seat ring; the retainer is a circular ring structure, the thickness of the inner diameter side of the retainer is smaller than the thickness of the outer diameter side of the retainer, the lower end surface of the retainer is a plane, the outer side of the upper end surface of the retainer is a plane, and the inner side of the upper end surface of the retainer is an annular concave spherical surface matched with the shaft ring raceway.

[0006] The curvature R center of the shaft ring raceway intersects with the rotation center line of the shaft ring at one point.

[0007] The steel ball is made of bearing steel material or ceramic material.

[0008] The holder is a circular ring structure, made of nylon or brass, and is equipped with a steel ball on one side end face.

[0009] The radius of the holder pocket matches the radius of the steel ball, and the ratio is 1.009-1.015.

[0010] The thickness of the outer diameter side of the holder is 1-1.2 times the radius of the steel ball.

[0011] The thickness of the inner diameter side of the holder is 0.6-0.8 times the radius of the steel ball.

[0012] The intersection of the upper end face of the holder and the annular concave spherical surface of the holder coincides with the boundary of the steel ball. BRIEF DESCRIPTION OF DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the existing standard design of the thrust ball bearing.

[0014] Attached Figure 2 It is a schematic diagram of the thrust ball bearing of the present application.

[0015] Attached Figure 3 It is a schematic diagram of the thrust ball bearing ring of the present application.

[0016] Attached Figure 4 It is a schematic diagram of the thrust ball bearing seat ring of the present application.

[0017] Attached Figure 5 It is a schematic diagram of the thrust ball bearing holder and steel ball of the present application.

[0018] In the figure: 1 ring, 1.1 ring raceway, 1.2 ring raceway curvature center, 2 seat ring, 2.1 seat ring outer raceway surface, 2.2 seat ring annular concave spherical surface channel, 2.3 seat ring inner raceway surface, 3 steel ball, 4 holder, 4.1 holder inner diameter, 4.2 holder outer diameter, 4.3 holder lower end face, 4.4 holder upper end face, 4.5 holder annular concave spherical surface, 4.6 holder pocket DETAILED DESCRIPTION

[0019] The specific embodiments of the present application are described in conjunction with the drawings.

[0020] As shown in Figure 2 to Figure 5 The thrust ball bearing of the present application includes a ring 1, a seat ring 2, a steel ball 3, and a holder 4.

[0021] The shaft ring 1 is a circular ring structure, and the shaft ring raceway 1.1 is an eccentric convex spherical surface; the seat ring 2 is a circular ring structure, the outer raceway surface 2.1 of the seat ring is a plane, the middle part of the raceway surface is an annular concave spherical groove 2.2 matched with the curvature of the steel ball 3, the rotation axis of the annular concave spherical groove 2.2 is coaxial with the rotation axis of the seat ring 2, the ratio of the curvature radius of the annular concave spherical groove 2.2 of the seat ring to the curvature radius of the steel ball 3 is 1.02-1.04, the inner raceway surface 2.3 of the seat ring is a plane, which has a height difference with the outer raceway surface 2.1 of the seat ring, and the inner raceway surface 2.3 of the seat ring is lower than the outer raceway surface 2.1 of the seat ring; the retainer 4 is a circular ring structure, the thickness of the inner diameter 4.1 of the retainer is smaller than the thickness of the outer diameter 4.2 of the retainer, the lower end surface 4.3 of the retainer is a plane, the outer side of the upper end surface 4.4 of the retainer is a plane, and the inner side of the upper end surface 4.4 of the retainer is a retainer annular concave spherical surface 4.5 matched with the shaft ring raceway 1.1.

[0022] The curvature center 1.2 of the shaft ring raceway is intersected with the rotation center line of the shaft ring 1 at one point.

[0023] The steel ball 3 is made of bearing steel or ceramic material.

[0024] The retainer 4 is a circular ring structure made of nylon or brass, and the steel ball 3 is assembled on one side of the retainer 4.

[0025] The radius of the retainer pocket 4.6 is matched with the radius of the steel ball 3, and the ratio of the two is 1.009-1.015.

[0026] The thickness of the outer diameter 4.2 of the retainer is matched with the radius of the steel ball 3, and the ratio of the two is 1-1.2.

[0027] The thickness of the inner diameter 4.1 of the retainer is matched with the radius of the steel ball 3, and the ratio of the two is 0.6-0.8.

[0028] The intersection point of the upper end surface 4.4 of the retainer and the retainer annular concave spherical surface 4.5 is coincided with the boundary of the steel ball 3.

[0029] The beneficial effects of the present application are:

[0030] The shaft ring 1 is a circular ring structure, and the shaft ring raceway 1.1 is designed as an eccentric convex spherical surface from the original groove-shaped raceway, so that the shaft ring raceway 1.1 and the steel ball 3 change from the original surface contact to point contact, significantly reduce the friction resistance when the bearing is running, and improve the limit speed of the bearing; on the other hand, the eccentric convex spherical surface of the shaft ring 1 is arranged in cooperation with the upper end surface 4.4 of the retainer, the annular concave spherical surface 4.5 of the retainer and the structure design that the inner raceway surface 2.3 of the raceway and the outer raceway surface 2.1 of the raceway have a height difference, when the shaft has a misalignment error, because of the convex spherical surface of the shaft ring 1, at this time, the assembly composed of the steel ball 3 and the retainer 4 runs in the annular concave spherical surface groove 2.2 of the raceway without any influence, only the shaft ring 1 tilts at an angle with the shaft; the shaft ring raceway 1.1 is arranged on the entire raceway surface, so that a larger tilt angle of the shaft can be allowed; the arrangement of the shaft ring raceway 1.1 concave spherical surface, the thickness of the inner diameter side 4.1 of the retainer being smaller than the thickness of the outer diameter side 4.2 of the retainer, and the inner raceway surface 2.3 of the raceway being lower than the outer raceway surface 2.1 of the raceway, makes the bearing of the design scheme have a certain radial load bearing capacity. In summary, the thrust ball bearing has the advantages of low friction, high speed, automatic compensation of misalignment error of the shaft, and allowing to bear radial load.

Claims

1. A thrust ball bearing with aligning function, parts of which include shaft ring, seat ring, steel ball, retainer; The shaft ring is a circular ring structure, and the shaft ring raceway is an eccentric convex spherical surface; the seat ring is a circular ring structure, the outer raceway surface of the seat ring is a plane, the middle part of the raceway surface is an annular concave spherical groove matched with the curvature of the steel ball, the rotation axis of the annular concave spherical groove is coaxial with the rotation axis of the seat ring, the ratio of the curvature radius of the annular concave spherical groove of the seat ring to the steel ball is 1.02-1.04, the inner raceway surface of the seat ring is a plane, which has a height difference with the outer raceway surface of the seat ring, and the inner raceway surface of the seat ring is lower than the outer raceway surface of the seat ring; the retainer is a circular ring structure, the thickness of the inner diameter side of the retainer is less than the thickness of the outer diameter side of the retainer, the lower end surface of the retainer is a plane, the outer side of the upper end surface of the retainer is a plane, and the inner side of the upper end surface of the retainer is a retainer annular concave spherical surface matched with the shaft ring raceway.

2. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The curvature center of the shaft ring raceway intersects with the rotation center line of the shaft ring at one point.

3. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The steel ball is made of bearing steel or ceramic material.

4. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The retainer is a circular ring structure made of nylon or brass, and the steel ball is assembled from one side end surface of the retainer.

5. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The pocket radius of the retainer matches the radius of the steel ball, and the ratio of the two is 1.009-1.

015.

6. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The ratio of the thickness of the outer diameter side of the retainer to the radius of the steel ball is 1-1.

2.

7. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The ratio of the thickness of the inner diameter side of the retainer to the radius of the steel ball is 0.6-0.

8.

8. The thrust ball bearing with a self-aligning function according to claim 1, characterized in that The intersection of the upper end surface of the retainer and the retainer annular concave spherical surface coincides with the boundary of the steel ball.

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