Self-lubricating thin-wall angular contact ball bearing applied to low-speed vacuum environment

Abstract

A self-lubricating thin-wall angular contact ball bearing applied to a low-speed vacuum environment comprises an outer ring, an inner ring and rolling balls, lubricating film layers are arranged on the surfaces of raceways of the outer ring and the inner ring, a plurality of partition blocks are evenly distributed between the outer ring and the inner ring, each partition block is of a cylinder structure which is made of a self-lubricating material and provided with a center hole, and the outer ring and the inner ring are connected through a bolt. A rolling ball is distributed in the center hole of each separation block and between any two adjacent separation blocks, a flange slope is arranged at the lower end of the raceway surface of the outer ring, and a locking opening used for locking the rolling balls is formed in the higher end of the flange slope. By the adoption of the technical scheme, the problems that a conventional integral type retainer of a large-size thin-wall bearing for the vacuum environment is relatively low in rigidity and precision, insufficient in retainer strength, increased in friction torque and insufficient in bearing self-lubricating capacity are solved, and the large-size thin-wall bearing can be used for a satellite laser communication pointing mechanism. And the device can also be popularized and applied to various vacuum environment use conditions with self-lubricating requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing structure design technical field, concretely is a kind of self-lubricating thin-wall angular contact ball bearing applied to low-speed vacuum environment. BACKGROUND

[0002] It is known that the existing angular contact ball bearing generally adopts integral cage and has no self-lubricating function, and the satellite laser communication pointing mechanism is affected by space limitation and the like, so that the bearing installed has the characteristics of large size, thin wall thickness and small internal space of bearing, which leads to that the conventional integral cage type angular contact ball bearing is inconvenient to install and use; moreover, the rigidity and precision of conventional integral cage are relatively low, and problems such as insufficient strength of cage and increased friction torque often occur, and the self-lubricating function cannot be realized. SUMMARY

[0003] To solve the above technical problems, the purpose of the utility model is to provide a self-lubricating thin-wall angular contact ball bearing applied to low-speed vacuum environment.

[0004] The technical scheme adopted by the utility model is as follows: a self-lubricating thin-wall angular contact ball bearing applied to low-speed vacuum environment, comprising an outer ring, an inner ring and rolling balls, the raceway surfaces of the outer ring and the inner ring are each provided with a lubricating film layer, a plurality of partition blocks are uniformly distributed between the outer ring and the inner ring, the partition block is a cylindrical structure with a central hole made of self-lubricating material, a rolling ball is distributed in the central hole of each partition block and between any two adjacent partition blocks, and the lower end of the outer ring raceway surface is provided with a stop edge slope, the inclination angle of the stop edge slope is 4-6°, and the higher end of the stop edge slope forms a lock opening for locking the rolling ball.

[0005] As a preferred scheme, the central hole axis of the partition block coincides with the axis of the partition block.

[0006] As a preferred scheme, the partition block is made of modified polytetrafluoroethylene composite material.

[0007] As a preferred scheme, the inclination angle of the stop edge slope is 5°

[0008] As a preferred scheme, the higher end of the stop edge slope forms a lock opening of the outer ring raceway, and the height t of the lock opening satisfies the following formula: grmax / 2 < t < grmin + Demin*△T*k.

[0009] In the formula, grmax is the maximum radial clearance value of the bearing, grmin is the minimum radial clearance of the bearing, Demin is the minimum diameter of the outer ring raceway, △T is the heating temperature difference during assembly, and k is the linear expansion coefficient.

[0010] As a preferred solution, the raceway surfaces of the outer ring and the inner ring are formed with a lubricating film layer by vacuum sputtering.

[0011] The utility model discloses the beneficial effect is:

[0012] Based on the defects of the prior art, the present application provides a self-lubricating thin-wall angular contact ball bearing applied to a low-speed vacuum environment, which is optimized in structure, and a lubricating film layer is arranged on the raceway surface of the outer ring and the inner ring, a plurality of partition blocks are uniformly distributed between the two, the partition block is a cylindrical structure with a central hole made of a self-lubricating material, a rolling ball is distributed in the central hole of each partition block and between any two adjacent partition blocks, and the lower end of the outer ring raceway surface is provided with a stop edge slope, the inclination angle of the stop edge slope is 4-6°, and the higher end of the stop edge slope forms a lock opening for locking the rolling ball.

[0013] Further optimization of the present application, the partition block retainer structure of the modified polytetrafluoroethylene composite material is simultaneously matched with the inner and outer raceways to form a MoS2-based lubricating film layer by vacuum sputtering, further improving the self-lubricating function of the bearing.

[0014] Further optimization of the present application, the inclination angle of the stop edge slope on one side of the outer ring raceway surface is preferably 5°, and the higher end of the stop edge slope forms a lock opening of the outer ring raceway, and the height t of the lock opening satisfies the following formula: grmax / 2<t<grmin+Demin*△T*k, which not only facilitates bearing assembly, but also locks the steel ball at room temperature, ensuring that the bearing is not disassembled. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0016] Figure 1 The utility model discloses the beneficial effect is:

[0017] Figure 2 The Figure 1 The local schematic view along the direction A;

[0018] Figure 3A schematic view of the structure of the partition block;

[0019] Figure 4 A schematic view of the locking of the outer ring raceway surface. DETAILED DESCRIPTION

[0020] In the following, the present application will be described in detail by way of exemplary embodiments. It is to be understood that the elements, structures and features of one embodiment can be beneficially combined with elements, structures and features of other embodiments without further description.

[0021] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by those skilled in the art; the similar words such as "one", "a" or "the" used in the patent application description and claims of the present application do not express the quantity limitation, but express that there is at least one; the similar words such as "include" or "contain" express that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, but do not exclude other elements or objects with the same function;

[0022] In order to more clearly describe the specific structure of the self-lubricating thin-wall angular contact ball bearing applied to the low-speed vacuum environment, the present embodiment is described in detail in combination with the drawings:

[0023] As shown in Figures 1-3 A self-lubricating thin-wall angular contact ball bearing applied to the low-speed vacuum environment is composed of an outer ring 1, an inner ring 2, rolling balls 3 and partition blocks 4, wherein the partition blocks 4 are provided with a plurality of and uniformly distributed between the outer ring 1 and the inner ring 2, the partition block 4 is a cylindrical structure with a center hole made of self-lubricating material, and one rolling ball 3 is distributed in the center hole of each partition block 4 and between any two adjacent partition blocks 4; the following example is described: 50 partition blocks 4 are uniformly arranged between the outer ring 1 and the inner ring 2, 50 rolling balls are arranged in the center hole of the partition block 4, and another 50 rolling balls are arranged between the adjacent two partition blocks, the rolling ball 3 and the inner ring 2 and the outer ring 1 form rolling contact; the rolling ball 3 can be a steel ball, the diameter specification is 4.7625mm, the inner diameter of the partition block 4 is 5.08mm, the gap between the steel ball arranged in the center hole of the partition block 4 and the partition block is 0.3175mm, and the reserved gap ensures the normal rotation of the steel ball in the partition block to avoid being stuck.

[0024] In the embodiment, the center hole axis of the partition block coincides with the axis of the partition block, wherein the partition block is made of self-lubricating material, preferably modified polytetrafluoroethylene composite material, which is composed of polytetrafluoroethylene, molybdenum disulfide, glass fiber and graphite. As a special polymer material, the material has good mechanical strength, high temperature resistance and aging resistance, low friction coefficient, temperature resistance range of-253℃~250℃, stable performance, and is easy to form a self-lubricating transfer layer on the relative friction surface to reduce friction.

[0025] The modified polytetrafluoroethylene composite material described herein is prepared by pressing and sintering after compounding polytetrafluoroethylene with 5% molybdenum disulfide, 15% glass fiber and 1% graphite. After preparation, the surface glass fiber is removed with hydrofluoric acid to ensure that the surface of the partition block is smooth and flat, without naked eye delamination, bubbles, tears and scratches, and the friction coefficient is controlled below 0.25.

[0026] In the embodiment, as shown in Figure 4 The lower end of the raceway surface of the outer ring 1 is provided with a retaining edge slope 11, and the inclination angle of the retaining edge slope 11 is 4-6°. The higher end of the retaining edge slope 11 forms a locking port 12 of the outer ring raceway, and the locking port height t ensures that the steel ball can be locked at room temperature to prevent the bearing from being unsheathed, that is, t>grmax / 2, and at the same time, t should be able to meet the requirement that the inner ring assembly can be assembled into the outer ring locking port after the outer ring is heated during bearing assembly, that is, t<Demin*△T*k; at the same time, the inclination angle α of the retaining edge slope of the outer ring side is selected as the optimal value of 5°, and the retaining edge slope roughness is controlled to Ra0.4 to avoid damage to the steel ball during installation of the steel ball;

[0027] In the above formula: grmax is the maximum radial clearance value of the bearing, grmin is the minimum radial clearance of the bearing, Demin is the minimum diameter of the outer ring raceway, △T is the heating temperature difference during assembly, and k is the linear expansion coefficient.

[0028] In the embodiment, the inner ring and the outer ring and the steel ball are preferably made of stainless steel 9Cr18 material, and a MoS2-based lubricating film layer is formed on the surface of the inner ring and the outer ring raceway by vacuum sputtering. Before sputtering, the bearing inner ring and outer ring raceway are finished to the final state, and molybdenum disulfide and titanium are used as target materials, and high-purity argon gas is used as the sputtering gas source. The sputtering film thickness is 0.001~0.003, the film surface is clean and smooth, and there are no cracks and pinholes and other defects, the film adhesion critical load is ≥20N, the film hardness is ≥3GPa, and the friction coefficient is ≤0.1.

[0029] The part not described in the above embodiment is prior art.

[0030] It should be noted that although the utility model is described through the above embodiments, the utility model can also have other various embodiments. Without departing from the spirit and scope of the utility model, those skilled in the art can obviously make various corresponding changes and modifications to the utility model, but these changes and modifications should all belong to the scope protected by the utility model claims and equivalents thereof.

Claims

1. A self-lubricating thin-walled angular contact ball bearing applied to a low-speed vacuum environment, comprising an outer ring, an inner ring and rolling balls, characterized in that: The raceway surfaces of the outer ring and the inner ring are provided with lubricating film layers, and a plurality of partition blocks are uniformly distributed between the outer ring and the inner ring, the partition blocks are cylindrical structures with central holes made of self-lubricating materials, a rolling ball is distributed in the central hole of each partition block and between any two adjacent partition blocks, the lower end of the raceway surface of the outer ring is provided with a retaining edge slope, the inclination angle of the retaining edge slope is 4-6°, and the higher end of the retaining edge slope forms a locking opening for locking the rolling ball.

2. The self-lubricating thin-walled angular contact ball bearing applied to low-speed vacuum environment according to claim 1, characterized in that: The central hole axis of the partition block coincides with the axis of the partition block.

3. The self-lubricating thin-walled angular contact ball bearing applied to low-speed vacuum environment according to claim 1, characterized in that: The partition block is made of modified polytetrafluoroethylene composite material.

4. The self-lubricating thin-walled angular contact ball bearing according to claim 1, applied to a low-speed vacuum environment, characterized in that: The inclination angle of the retaining edge slope is 5°.

5. The self-lubricating thin-walled angular contact ball bearing according to claim 1, applied to a low-speed vacuum environment, characterized in that: The higher end of the retaining edge slope forms a locking opening of the raceway of the outer ring, and the height t of the locking opening satisfies the following formula: grmax / 2 < t < grmin + Demin*△T*k. In the formula, grmax is the maximum radial clearance value of the bearing, grmin is the minimum radial clearance of the bearing, Demin is the minimum diameter of the raceway of the outer ring, △T is the heating temperature difference during assembly, and k is the linear expansion coefficient.

6. The self-lubricating thin-walled angular contact ball bearing according to any one of claims 1-5, applied to a low-speed vacuum environment, characterized in that: The raceway surfaces of the outer ring and the inner ring are provided with lubricating film layers, and a plurality of partition blocks are uniformly distributed between the outer ring and the inner ring, the partition blocks are cylindrical structures with central holes made of self-lubricating materials, a rolling ball is distributed in the central hole of each partition block and between any two adjacent partition blocks, the lower end of the raceway surface of the outer ring is provided with a retaining edge slope, the inclination angle of the retaining edge slope is 4-6°, and the higher end of the retaining edge slope forms a locking opening for locking the rolling ball.

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