Double-inner-ring low-friction coded disc bearing

Abstract

The invention discloses a double-inner-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 outer ring on an existing coded disc bearing, the bearing is clamped in the operation process, and therefore the bearing is abraded is solved. Two inner rings are symmetrically arranged in parallel, annular conical surfaces are machined on the edges of the opposite end faces of the two inner rings, an outer ring is arranged on the outer surfaces of the two inner rings in a sleeving mode, an annular roller path is machined in the inner wall of the outer ring in the circumferential direction, and a plurality of rolling bodies are evenly arranged in the annular roller path in the circumferential direction. The internal structure is a full-ball four-point contactor bearing, the number of rolling bodies is increased, the internal bearing capacity of the bearing is improved, when force smaller than 3.5 N is applied to the friction face of the outer ring on the coded disc bearing, the bearing can run smoothly, and the phenomenon of clamping stagnation caused by too large bearing capacity in the running process of the bearing is avoided. 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 inner 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 outer 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 inner 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 outer ring of the existing code disc bearing, the bearing may get stuck during operation, thereby causing the bearing to wear.

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

[0007] The two inner rings 2 are arranged in parallel and symmetrically, and the edges of the opposite end faces of the two inner rings 2 are processed with annular conical surfaces. An outer ring 1 is sleeved on the outer surfaces of the two inner rings 2. The inner wall of the outer ring 1 is processed with annular raceways 1-6 along the circumferential direction, and the inside of the annular raceways 1-6 is evenly provided with multiple rolling bodies 3 along the circumferential direction.

[0008] Furthermore, the cross section of the annular raceway 1-6 is an isosceles right triangle;

[0009] Furthermore, an annular boss is machined on the outer surface of one end of the outer ring 1, and a plurality of positioning holes 1-1 are evenly machined on the end surface of the annular boss along the circumferential direction;

[0010] Furthermore, one end surface of the outer ring 1 is uniformly processed with a plurality of threaded holes 1-2 along the circumferential direction;

[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 annular raceways 1-6 on the outer ring 1 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 and adopts two inner rings that are arranged in parallel and symmetrically, and annular cones are processed on the edges of the opposite end faces of the two inner rings. An outer ring is sleeved on the outer surface of the two inner rings, and an annular raceway is processed on the inner wall of the outer ring along the circumferential direction, and a plurality of rolling bodies are evenly arranged inside the annular raceway along the circumferential direction. The internal structure is a full-ball four-point contactor bearing, which increases the number of rolling bodies and the internal load-bearing capacity of the bearing. When a force less than 3.5N is applied to the friction surface of the outer ring on the code disk bearing, the bearing can run 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 to improve the stability of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main cross-sectional view of a double inner ring low friction code disc bearing according to the present invention;

[0018] Figure 2 It is a cross-sectional view of the outer ring of a double inner 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 inner ring low friction code disc bearing in the present embodiment comprises an outer ring 1, two inner rings 2 and rolling elements 3;

[0020] The two inner rings 2 are arranged in parallel and symmetrically, and the edges of the opposite end faces of the two inner rings 2 are processed with annular conical surfaces. An outer ring 1 is sleeved on the outer surfaces of the two inner rings 2. The inner wall of the outer ring 1 is processed with annular raceways 1-6 along the circumferential direction, and the inside of the annular raceways 1-6 is evenly provided with multiple rolling bodies 3 along the circumferential direction.

[0021] In this specific implementation, two inner rings are arranged in parallel and symmetrically, and annular cones are processed on the edges of the opposite end faces of the two inner rings. An outer ring is sleeved on the outer surface of the two inner rings, and an annular raceway is processed on the inner wall of the outer ring along the circumferential direction, and a plurality of rolling elements are evenly arranged inside the annular raceway along the circumferential 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 driving friction surface 1-3 of the outer ring on the code disk bearing, the bearing can operate smoothly to avoid the phenomenon of bearing jamming 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 inner ring low friction code disc bearing described in this embodiment, the cross section of the annular raceway 1-6 is an isosceles right triangle.

[0023] In this specific implementation, the cross-section of the annular raceway 1-6 is an isosceles right triangle, and the edges of the opposite end faces of the two inner rings 2 are both machined with annular cones, which can reduce the friction resistance to a minimum. The piezoelectric drive ceramic input driving force point 1-4 is designed to be located on the extension line of the ball and raceway contact point line 1-5 to ensure stability. The contact angle is 45°. This structural bearing is named a 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 inner ring low-friction code disc bearing described in this embodiment, an annular boss is machined on the outer surface of one end of the outer ring 1, and a plurality of positioning holes 1-1 are evenly machined on the end surface of the annular boss along the circumferential direction;

[0025] In this specific embodiment, an annular boss is machined on the outer surface of one end of the outer ring 1, and a plurality of positioning holes 1-1 are evenly machined on the end surface of the annular boss along the circumferential direction to facilitate fixation with the frame housing and the end cover, thereby improving the bearing stability.

[0026] Specific implementation method four: Combination Figure 1and Figure 2 To explain this embodiment, this embodiment is a further limitation of the bearing described in the specific embodiment three. This embodiment describes a double inner ring low friction code disc bearing, in which one end face of the outer ring 1 is evenly processed with multiple threaded holes 1-2 along the circumferential direction.

[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 inner 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 inner 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 inner 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 inner ring low friction code disc bearing is described. The number Z of rolling elements 3 inside the annular raceway 1-6 on the outer ring 1 is Where P is the diameter of the pitch circle where the center of the sphere is located.

Claims

1. A double inner ring low friction code disc bearing, Features: It comprises an outer ring (1), two inner rings (2) and rolling elements (3); The two inner rings (2) are arranged in parallel and symmetrically, and the edges of the opposite end faces of the two inner rings (2) are both processed with annular conical surfaces. An outer ring (1) is sleeved on the outer surfaces of the two inner rings (2), and an annular raceway (1-6) is processed on the inner wall of the outer ring (1) along the circumferential direction, and a plurality of rolling bodies (3) are evenly arranged inside the annular raceway (1-6) along the circumferential direction.

2. A double inner ring low friction code disc bearing according to claim 1, Features: The cross section of the annular raceway (1-6) is an isosceles right triangle.

3. A double inner ring low friction code disc bearing according to claim 1, Features: An annular boss is machined on the outer surface of one end of the outer ring (1), and a plurality of positioning holes (1-1) are evenly machined on the end surface of the annular boss along the circumferential direction.

4. A double inner ring low friction code disc bearing according to claim 3, Features: One end surface of the outer ring (1) is uniformly processed with a plurality of threaded holes (1-2) along the circumferential direction.

5. A double inner ring low friction code disc bearing according to claim 1, Features: The outer ring (1) and the inner ring (2) are both made of Si 4 N 3 .

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

7. A double inner ring low friction code disc bearing according to claim 6, Features: 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 inner ring low friction code disc bearing according to claim 7, Features: The number Z of rolling elements (3) inside the annular raceway (1-6) on the outer ring (1), Where P is the diameter of the pitch circle where the center of the sphere is located.

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