A clearance-compensated deep groove ball bearing

Abstract

This utility model discloses a clearance-compensated deep groove ball bearing, relating to the field of bearing technology. It includes an inner ring, an outer ring, and several circumferentially distributed rolling elements. Both sides of each rolling element are provided with annular dust covers. Independent isolation blocks, which are solid lubricating blocks, are provided between adjacent rolling elements. No lubricating grease is present in the area enclosed by the inner ring, outer ring, and dust covers. Notches for filling the isolation blocks are provided on the outer edge of the first side of the inner ring and the inner edge of the first side of the outer ring. This utility model uses independent solid lubricating isolation blocks. During use, the powder particles generated by the wear of the isolation blocks can act as solid lubricants. The lubricating powder particles are distributed within the bearing and, as the rolling elements rotate, can be evenly distributed in the raceway and ball contact area, forming a lubricating film and greatly reducing the coefficient of friction. The notches on one end face of the inner and outer rings facilitate the filling of the isolation blocks and the assembly of the bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to a clearance-compensated deep groove ball bearing. Background Technology

[0002] The technological development of high-temperature vacuum deep groove ball bearings has formed a multi-dimensional innovation system in structural design and lubrication methods. At the structural design level, the core focuses on thermal deformation compensation and operating condition adaptation: C3 to C5 group designs with increased clearance are commonly used to prevent seizing at high temperatures. In extreme high-temperature scenarios, cageless structures have become mainstream, combined with hybrid ceramic designs using silicon nitride ceramic rolling elements, enabling stable operation at 1200℃. Regarding lubrication methods, the focus is mainly on long-term stability under high temperature and vacuum conditions. In some scenarios, polyimide cages are used in conjunction with high-temperature composite grease; others employ solid lubrication methods, typically of two types: one is the direct addition of molybdenum disulfide or graphite powder particles as lubricant, and the other is the use of vapor-deposited molybdenum disulfide coating. Some products also incorporate honeycomb oil reservoir structures or plastic oil curing technology to adapt to high-speed operating conditions with rapid temperature changes, further expanding the application boundaries of bearings.

[0003] High-temperature deep groove ball bearings still suffer from multiple technical shortcomings. The lubrication system is a core pain point; under high-temperature conditions, grease is prone to oxidation and decomposition, producing carbon deposits, or drying out due to accelerated evaporation in a vacuum environment. Even high-end products like perfluoropolyether grease struggle to maintain lubrication film stability over long periods at high temperatures. Structural design faces a balancing challenge. While large clearances (C3-C5 group) mitigate thermal deformation, excessive clearance under extreme temperature differences can still lead to increased vibration. Furthermore, lubrication failure and structural defects can create a vicious cycle: insufficient lubrication causes temperature rise, accelerates material degradation and structural deformation, further damaging the lubrication environment, ultimately leading to bearing wear failure or seizure. Moreover, current monitoring technologies struggle to accurately predict lubrication degradation and material fatigue under high-temperature vacuum conditions. Utility Model Content

[0004] The purpose of this invention is to solve the problems of abnormal noise, large torque fluctuation, and easy failure of ordinary grease lubrication in deep groove ball bearings under large temperature differences, and to provide a clearance-compensated deep groove ball bearing.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A clearance-compensated deep groove ball bearing includes an inner ring, an outer ring, and a plurality of circumferentially distributed rolling elements; each rolling element has an annular dust cover on both sides; each adjacent rolling element has an independent isolation block, which is a solid lubricating block; there is no lubricating grease in the area enclosed by the inner ring, outer ring, and dust covers; and the outer edge of the first side of the inner ring and the inner edge of the first side of the outer ring have notches for filling the isolation blocks.

[0006] Furthermore, the size of the isolation block is smaller than that of the rolling element.

[0007] Furthermore, both the outer ring side of the bearing inner ring and the inner ring side of the bearing outer ring are provided with grooves to accommodate rolling elements, and the inner end of the notch extends into the groove.

[0008] Furthermore, the depth of the groove is greater than the depth of the notch.

[0009] Furthermore, the dust cover is provided with a retaining spring on the outside, the outer ring of the bearing is provided with annular grooves on both sides to accommodate the retaining spring, and the inner ring of the bearing is provided with annular steps on both outer edges.

[0010] Preferably, the isolation block is a graphite block.

[0011] Preferably, the isolation block contains molybdenum disulfide particles and graphite particles.

[0012] Furthermore, the isolation block is formed by powder metallurgy of molybdenum disulfide particles and graphite particles.

[0013] Furthermore, the rolling element comes into frictional contact with the isolation block, and lubricating particles fall off the isolation block.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention employs an independent solid lubrication isolation block. During use, the powder particles generated by the wear of the isolation block provide solid lubrication. These lubricating powder particles are distributed within the bearing, achieving a near-uniform distribution in the contact area between the raceway and the spherical rolling elements as the rolling elements rotate, forming a lubricating film. This significantly reduces the coefficient of friction, greatly expands the bearing's applicability, and lowers operating costs. By using the isolation block and reducing the initial ball-rolling clearance, a compensatory design is achieved, allowing the bearing to automatically adjust the ball clearance according to actual operating conditions. Notches on one end face of the inner and outer rings facilitate the installation of the isolation block and bearing assembly. Attached Figure Description

[0015] Figure 1 This is an assembly diagram of the present invention.

[0016] Figure 2 This is an exploded view of the present invention.

[0017] In the diagram: 1. Inner ring of bearing; 2. Outer ring of bearing; 3. Rolling element; 4. Spacer block; 5. Dust cover; 6. Snap ring; 7. Groove; 8. Notch; 9. Annular groove; 10. Step. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0019] Specific embodiments of the clearance-compensated deep groove ball bearing provided by this utility model: Please see Figure 1 and Figure 2 The clearance-compensated deep groove ball bearing includes an inner ring 1, an outer ring 2, and several circumferentially distributed rolling elements 3, the rolling elements 3 being steel balls; annular dust covers 5 are provided on both sides of the rolling elements 3; retaining rings 6 are provided on the outer side of the dust covers 5; annular grooves 9 for accommodating retaining rings 6 are provided on both sides of the outer ring 2; and annular steps 10 are provided on both outer edges of the inner ring 1.

[0020] Each adjacent rolling element 3 is provided with an independent isolation block 4. The isolation block 4 is a solid lubricating block. There is no lubricating grease in the area enclosed by the bearing inner ring 1, the bearing outer ring 2 and the dust cover 5. The first outer edge of the bearing inner ring 1 and the first inner edge of the bearing outer ring 2 are provided with notches 8 for filling the isolation block 4.

[0021] The size of the isolation block 4 is smaller than that of the rolling element 3. Grooves 7 for accommodating the rolling element 3 are provided on the outer ring side of the bearing inner ring 1 and the inner ring side of the bearing outer ring 2. The inner end of the notch 8 extends into the groove 7. The groove 7 is an annular groove with an arc-shaped cross-sectional profile at each point of the annulus. The cross-sectional profile of the notch 8 perpendicular to the bearing axis is also arc-shaped. The center depth of the groove 7 is greater than the center depth of the notch 8. The rolling element 3 and the isolation block 4 are in frictional contact, and lubricating particles are shed from the isolation block 4.

[0022] In this embodiment, the spacer block 4 is formed by powder metallurgy of molybdenum disulfide particles and graphite particles, and the spacer block 4 contains molybdenum disulfide particles and graphite particles. In some other embodiments, the spacer block 4 is a graphite block.

[0023] The spacer block 4 is made of molybdenum disulfide and graphite, and its size is slightly smaller than that of the rolling element 3. During bearing installation, a deep groove ball filling scheme is used, with a filling angle of less than 185°. After the rolling elements 3 are fully loaded, a spacer block 4 is inserted between every two rolling elements 3 through the ring filling notch 8. After completion, dust covers 5 are installed on both sides of the bearing and secured with retaining rings 6.

[0024] When the bearing is running, the rolling element 3 contacts and rubs against the spacer block 4. A suitable ball socket is ground on the end face of the spacer block 4 to accommodate the different clearances of the rolling element 3 in the bearing raceway under temperature differences of several hundred degrees. At the same time, the position of the ball socket can limit the contact between the spacer block 4 and the rolling element 3 during operation, preventing the spacer block 4 from colliding with the filling notch 8.

[0025] In the initial stage of bearing operation, the gap between the bearing rolling element 3 and the spacer block 4 is extremely small. As the rolling element 3 rotates and comes into contact with the spacer block 4, ball joints and dimples appear on the spacer block 4. As the gap increases, the spacer block 4 stops wearing. This gap compensation method can prevent the bearing from jamming due to the thermal expansion and contraction of the bearing rings caused by high and low temperature differences, and the sudden change in friction torque.

[0026] The bearing does not require grease lubrication. The graphite and molybdenum disulfide particles (or powder) that wear off after the isolation block 4 is distributed in the bearing as the rolling element 3 rotates. They can be basically evenly distributed in the contact area between the raceway groove 7 and the rolling element 3, forming a lubricating film that greatly reduces the coefficient of friction.

[0027] The design of dust covers 5 and snap rings 6 on both sides of the bearing can ensure that solid lubricating powder is always kept in the raceway, preventing the lubricating powder from leaking out and also preventing external dust from entering the raceway.

[0028] The bearing race has a notch 8 on one side, which is only large enough to allow the installation and removal of the spacer block 4. This prevents the rolling elements 3 from interfering with the filling notch 8 and causing abnormal noise. The bearing is also designed for horizontal installation, with the side with the notch 8 facing upwards, so it has no impact on bearing rotation.

[0029] This embodiment solves the problems of abnormal noise, large torque fluctuations, and easy failure of ordinary grease lubrication at high temperatures in deep groove ball bearings under conditions of large high and low temperature differences. By using molybdenum disulfide and graphite powder metallurgy to fabricate an isolation block 4, and reducing the initial clearance between the rolling elements 3, a compensatory design is achieved where the bearing automatically generates a suitable clearance between the rolling elements 3 according to actual operating conditions. Simultaneously, the powder generated by the wear of the isolation block 4 during use can also serve as solid lubrication, greatly expanding the bearing's applicability and reducing bearing operating costs.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A clearance-compensated deep groove ball bearing, comprising an inner ring (1), an outer ring (2), and a plurality of circumferentially distributed rolling elements (3); wherein each rolling element (3) is provided with an annular dust cover (5) on both sides; characterized in that, Each of the adjacent rolling elements (3) is provided with an independent isolation block (4). The isolation block (4) is a solid lubricating block. There is no lubricating grease in the area enclosed by the bearing inner ring (1), bearing outer ring (2) and dust cover (5). The first outer edge of the bearing inner ring (1) and the first inner edge of the bearing outer ring (2) are provided with a notch (8) for filling the isolation block (4).

2. The clearance-compensated deep groove ball bearing according to claim 1, characterized in that, The size of the isolation block (4) is smaller than that of the rolling element (3).

3. The clearance-compensated deep groove ball bearing according to claim 2, characterized in that, The bearing inner ring (1) and the bearing outer ring (2) are both provided with grooves (7) to accommodate rolling elements (3), and the inner end of the notch (8) extends to the groove (7).

4. The clearance-compensated deep groove ball bearing according to claim 3, characterized in that, The depth of the groove (7) is greater than the depth of the notch (8).

5. The clearance-compensated deep groove ball bearing according to claim 1, characterized in that, The dust cover (5) is provided with a retaining ring (6) on the outside, and the outer ring (2) of the bearing is provided with annular grooves (9) on both sides to accommodate the retaining ring (6). The inner ring (1) of the bearing is provided with annular steps (10) on both sides of the outer edge.

6. The clearance-compensated deep groove ball bearing according to claim 1, characterized in that, The isolation block (4) is a graphite block.

7. The clearance-compensated deep groove ball bearing according to claim 1, characterized in that, The isolation block (4) contains molybdenum disulfide particles and graphite particles.

8. The clearance-compensated deep groove ball bearing according to claim 7, characterized in that, The isolation block (4) is formed by powder metallurgy of molybdenum disulfide particles and graphite particles.

9. The clearance-compensated deep groove ball bearing according to claim 6, 7, or 8, characterized in that, The rolling element (3) comes into frictional contact with the isolation block (4), and lubricating particles fall off the isolation block (4).

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