Double-outer-ring low-friction coded disc bearing

Abstract

The invention discloses a double-outer-ring low-friction coded disc bearing and relates to the technical field of bearings. The problem that when force smaller than 3.5 N is applied to the friction face of an inner ring on an existing coded disc bearing, the bearing is clamped in the operation process, and therefore the bearing is abraded is solved. An inner ring raceway is machined on the outer surface of an inner ring in the circumferential direction, a plurality of rolling bodies are evenly arranged in the inner ring raceway in the circumferential direction, the outer surface of the inner ring is evenly sleeved with two outer rings in the length direction, the inner structure is a full-ball four-point contactor bearing, the number of the rolling bodies is increased, and the inner bearing capacity of the bearing is improved; when force smaller than 3.5 N is applied to the friction face of the inner ring on the coded disc bearing, the bearing can run smoothly, and the phenomenon that the bearing is clamped due to the fact that bearing force is too large in the running process of the bearing is avoided. The positioning holes, the threaded holes and the positioning grooves in the two sides of the bearing are fixed to the rack and the end cover, and the stability of the bearing is improved. The invention is applicable to the technical field of bearings.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to a double outer ring low-friction code disc bearing. Background Art

[0002] Low-orbit satellite systems generally refer to large satellite systems composed of multiple satellites that can process information in real time, which can make up for the country's shortcomings in low-orbit satellite systems. As a completely independently created product, the technical indicators and experience for reference in the design and production of related parts are basically zero, and the same is true for the code disk bearings used in it. However, after continuous design verification and correction, it finally passed the routine test, strength test, temperature test and environmental test.

[0003] The basic structure of the code disk bearing is a full ceramic double half outer ring low friction four-point contact ball bearing. The bearing is fully loaded with rolling elements, the double half outer ring and the bearing seat are transitionally matched, and the disc spring is used to compress the bearing in the axial direction. The bearing is fixed in the bearing seat, which is equivalent to the bearing being preloaded at a constant pressure; then the piezoelectric ceramic drive device performs linear reciprocating motion, drives the inner ring to rotate through the friction plate, and then drives the code disk to rotate, and the actual rotation state is pulsating. Although the normal working speed of the inner ring is less than 60r / min, the input to make the bearing rotate is low, so the bearing needs to have a lower starting friction.

[0004] In summary, when a force less than 3.5N is applied to the friction surface of the inner ring of the existing code disk bearing, the bearing may become stuck during operation, thereby causing the bearing to wear. Summary of the invention

[0005] The present invention proposes a double outer ring low friction code disc bearing to solve the problem that when a force less than 3.5N is applied to the friction surface of the inner ring of the existing code disc bearing, the bearing may get stuck during operation, thereby causing the bearing to wear.

[0006] A double outer ring low friction code disc bearing of the present invention comprises two outer rings 1, an inner ring 2 and rolling elements 3;

[0007] The outer surface of the inner ring 2 is processed with an inner ring raceway 2-5 along the circumferential direction, and a plurality of rolling bodies 3 are evenly arranged inside the inner ring raceway 2-5 along the circumferential direction. Two outer rings 1 are evenly sleeved on the outer surface of the inner ring 2 along the length direction.

[0008] Furthermore, the cross section of the inner ring raceway 2-5 is an isosceles right triangle;

[0009] Furthermore, the lower portion of the outer surface of the inner ring 2 is processed with an annular shoulder, and a plurality of threaded holes 2-6 are processed on the end surface of the annular shoulder along the circumferential direction;

[0010] Furthermore, an annular protrusion is processed on the upper part of the inner surface of the inner ring 2, and a plurality of positioning holes 2-4 are evenly processed on the end surface of the annular protrusion along the circumferential direction, and a positioning groove 2-7 is processed between every two positioning holes 2-4;

[0011] Furthermore, the outer ring 1 and the inner ring 2 are both made of Si4N3;

[0012] Furthermore, the rolling body 3 is a ceramic ball;

[0013] Furthermore, the diameter D of the rolling element 3 is W , D W =KT; T is the external component assembly height, K is the coefficient;

[0014] Furthermore, the number Z of rolling elements 3 inside the inner ring raceway 2-5 on the inner ring 2 is Where P is the diameter of the pitch circle where the center of the sphere is located.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention overcomes the shortcomings of the prior art. The outer surface of the inner ring is processed with an inner ring raceway along the circumferential direction. A plurality of rolling elements are evenly arranged inside the inner ring raceway along the circumferential direction. Two outer rings are evenly sleeved on the outer surface of the inner ring along the length direction. The internal structure is a full-ball four-point contactor bearing, which increases the number of rolling elements and the internal load-bearing capacity of the bearing. When a force less than 3.5N is applied to the friction surface of the inner ring of the code disk bearing, the bearing can operate smoothly, avoiding the phenomenon of the bearing being stuck due to excessive load-bearing capacity during operation. The bearing is fixed to the frame and the end cover through the positioning holes, threaded holes and positioning grooves on both sides of the bearing, thereby improving the stability of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a double outer ring low-friction code disc bearing according to the present invention;

[0018] Figure 2 It is a cross-sectional view of a double outer ring low-friction code disc bearing described in the present invention. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1 and Figure 2 The present embodiment is described as follows: a double outer ring low friction code disc bearing in the present embodiment comprises two outer rings 1, an inner ring 2 and rolling elements 3;

[0020] The outer surface of the inner ring 2 is processed with an inner ring raceway 2-5 along the circumferential direction, and a plurality of rolling bodies 3 are evenly arranged inside the inner ring raceway 2-5 along the circumferential direction. Two outer rings 1 are evenly sleeved on the outer surface of the inner ring 2 along the length direction.

[0021] In this specific implementation, the outer surface of the inner ring is processed with an inner ring raceway along the circumferential direction, and a plurality of rolling elements are evenly arranged inside the inner ring raceway along the circumferential direction. Two outer rings are evenly sleeved on the outer surface of the inner ring along the length direction. The internal structure is a full-ball four-point contactor bearing, which increases the number of rolling elements and the internal load-bearing capacity of the bearing. When a force less than 3.5N is applied to the friction surface 2-1 of the inner ring of the code disk bearing, the bearing can operate smoothly to avoid the phenomenon of the bearing being stuck due to excessive load-bearing capacity during operation; the bearing is fixed to the frame and the end cover through the positioning holes, threaded holes and positioning grooves on both sides of the bearing to improve the stability of the bearing.

[0022] Specific implementation method 2: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the first embodiment. In the double outer ring low friction code disc bearing described in this embodiment, the cross section of the inner ring raceway 2-5 is an isosceles right triangle.

[0023] In this specific implementation, the cross-section of the inner ring raceway 2-5 is an isosceles right triangle to minimize friction resistance. The piezoelectric drive ceramic input driving force point 2-3 is designed to be located on the extension line of the ball and raceway contact point line 2-2 to ensure stability. The contact angle is 45°. This structural bearing is named full ceramic double half outer ring low friction four-point contact ball bearing.

[0024] Specific implementation method three: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the first embodiment. In the double outer ring low friction code disc bearing described in this embodiment, the lower part of the outer surface of the inner ring 2 is processed with an annular shoulder, and the end surface of the annular shoulder is processed with a plurality of threaded holes 2-6 along the circumferential direction;

[0025] In this specific implementation, a plurality of threaded holes 2-6 are processed on the end surface of the annular shoulder on the outer surface of the inner ring 2 to facilitate connection with the frame housing and the end cover for fixing, thereby effectively improving the stability of the bearing.

[0026] Specific implementation method four: Combination Figure 1 and Figure 2To explain this embodiment, this embodiment is a further limitation of the bearing described in the specific embodiment three. This embodiment describes a double outer ring low friction code disk bearing, in which an annular protrusion is processed on the upper inner surface of the inner ring 2, and a plurality of positioning holes 2-4 are evenly processed along the circumferential direction on the end face of the annular protrusion, and a positioning groove 2-7 is processed between every two positioning holes 2-4.

[0027] Specific implementation method five: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the first embodiment. In this embodiment, a double outer ring low friction code disc bearing is described. The outer ring 1 and the inner ring 2 are both made of Si4N3.

[0028] In this specific implementation method, material selection is performed based on the bearing operating temperature, force estimation, self-lubrication and vacuum environment requirements. From the operating temperature of -20 to 60°C, ordinary bearing steel can be used, but when used in a vacuum environment, cold welding will occur between metals, so metal materials are not applicable. At the same time, there is a self-lubrication requirement, so ceramic materials are the best choice, which can both self-lubricate and avoid metal cold welding, and have excellent mechanical properties. There are currently two commonly used ceramic bearing materials, one is ZrO2 and the other is Si4N3. Both ceramic materials can meet the bearing material requirements of this article. Due to the requirement of weight reduction, Si4N3 is selected for the bearing. Si4N3 material has a low density and a higher hardness than ZrO2, which can improve the reliability of the bearing.

[0029] Specific implementation method six: Combination Figure 1 and Figure 2 The present embodiment is described as a further limitation on the bearing described in the first embodiment. The present embodiment describes a double outer ring low friction code disc bearing, wherein the rolling element 3 is a ceramic ball.

[0030] Specific implementation method seven: Combination Figure 1 and Figure 2 This embodiment is a further limitation of the bearing described in the sixth embodiment. In this embodiment, a double outer ring low friction code disc bearing is described. The diameter D of the rolling element 3 is W , D W =KT; T is the assembly height of the external components, and K is the coefficient.

[0031] Specific implementation method eight: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the seventh embodiment. In this embodiment, a double outer ring low friction code disc bearing is described. The number of rolling elements 3 inside the inner ring raceway 2-5 on the inner ring 2 is Z. Where P is the diameter of the pitch circle where the center of the sphere is located.

Claims

1. A double outer ring low friction code disc bearing, characterized in that: It includes two outer rings (1), an inner ring (2) and rolling elements (3); The outer surface of the inner ring (2) is processed with an inner ring raceway (2-5) along the circumferential direction, and a plurality of rolling bodies (3) are evenly arranged inside the inner ring raceway (2-5) along the circumferential direction. Two outer rings (1) are evenly sleeved on the outer surface of the inner ring (2) along the length direction.

2. A double outer ring low friction code disc bearing according to claim 1, characterized in that: The cross section of the inner ring raceway (2-5) is an isosceles right triangle.

3. A double outer ring low friction code disc bearing according to claim 1, characterized in that: The lower part of the outer surface of the inner ring (2) is processed with an annular shoulder, and a plurality of threaded holes (2-6) are processed on the end surface of the annular shoulder along the circumferential direction.

4. A double outer ring low friction code disc bearing according to claim 3, characterized in that: An annular protrusion is machined on the upper inner surface of the inner ring (2), a plurality of positioning holes (2-4) are evenly machined on the end surface of the annular protrusion along the circumferential direction, and a positioning groove (2-7) is machined between every two positioning holes (2-4).

5. The double outer ring low friction code disc bearing according to claim 1, characterized in that: The outer ring (1) and the inner ring (2) are both made of Si4N3.

6. A double outer ring low friction code disc bearing according to claim 1, characterized in that: The rolling body (3) is a ceramic ball.

7. A double outer ring low friction code disc bearing according to claim 6, characterized in that: The diameter D of the rolling element (3) W , D W =KT; T is the assembly height of the external components, and K is the coefficient.

8. A double outer ring low friction code disc bearing according to claim 7, characterized in that: The number Z of rolling elements (3) inside the inner ring raceway (2-5) on the inner ring (2), Where P is the diameter of the pitch circle where the center of the sphere is located.

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