A high-precision magnetic nano-thin film lubrication device

Abstract

The present invention relates to a high-precision magnetic nano film lubrication device. The device mainly solves the technical problems of excessive operating torque and slow response speed of deep groove ball bearings, which greatly reduce the operating life of the bearings or even make them fail. The technical solution of the present invention is: the device includes a rotating shaft, an end cover, a housing and an elastic retaining ring, and also includes a first permanent magnet, a second permanent magnet, a plurality of needle rollers, an outer ring, an inner ring, a retaining frame, an outer ring pressure cover and an inner ring pressure cover, the first permanent magnet is mounted on a first mounting cavity provided on the outer circumference of the outer ring, the second permanent magnet is mounted on a second mounting cavity provided on the inner circumference of the inner ring, a needle roller mounting cavity is formed between the inner circumference of the outer ring and the outer circumference of the inner ring, the plurality of needle rollers are evenly mounted in the needle roller holes of the retaining frame, the retaining frame and the needle rollers are mounted in the needle roller mounting cavity, the inner ring, the second permanent magnet and the inner ring pressure cover are sleeved on the rotating shaft, and the outer ring, the first permanent magnet and the outer ring pressure cover are arranged in the inner cavity provided in the housing.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering lubrication, and in particular relates to a high-precision magnetic nano-film lubrication device. Background Art

[0002] Magnetic fluid is a new type of nano-intelligent material with superparamagnetism. Magnetic nanoparticles coated with surfactants are evenly dispersed in the carrier liquid. Due to its unique rheological and controllable advantages, it is used in sealing, lubrication and heat dissipation. Magnetic fluid can prevent the loss of lubricant by providing directional lubrication in a fixed magnetic field. At the same time, by adjusting the magnetic field strength, the viscosity of the magnetic fluid will also change, which can adjust the viscosity changes caused by environmental factors such as high temperature to achieve active lubrication.

[0003] In aerospace high-precision optical servo mechanisms, the clearance of deep groove ball bearings is usually reduced to a very small level to improve servo accuracy, which leads to problems such as excessive operating torque and slow response speed, which seriously affects the results of aerospace high-precision optical measurements. Therefore, how to develop a nano-thin film lubrication device with low rotation torque and high operating accuracy has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem that the clearance of deep groove ball bearings is compressed to a very small level, resulting in excessive operating torque, slow response speed, greatly reduced bearing service life or even failure, and to provide a high-precision magnetic nano film lubrication device.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A high-precision magnetic nano-film lubrication device, comprising a rotating shaft, an end cover, a housing and an elastic retaining ring, and further comprising a first permanent magnet, a second permanent magnet, a plurality of needle rollers, an outer ring, an inner ring, a retaining frame, an outer ring pressure cover and an inner ring pressure cover, wherein the first permanent magnet is mounted on a first mounting cavity provided on the outer circumference of the outer ring, the outer ring pressure cover is mounted on an open end of the first mounting cavity provided on the outer ring and fixes the first permanent magnet in the first mounting cavity, the second permanent magnet is mounted on a second mounting cavity provided on the inner circumference of the inner ring, the inner ring pressure cover is mounted on an open end of the first mounting cavity provided on the inner ring and fixes the first permanent magnet in the first mounting cavity One end of the cavity is open and the second permanent magnet is fixed in the second installation cavity, the outer ring and the outer ring pressure cover are correspondingly arranged on the inner ring and the inner ring pressure cover, and a needle roller installation cavity is formed between the inner circumference of the outer ring and the outer circumference of the inner ring, the plurality of needle rollers are evenly installed in the needle roller holes of the retaining frame, the retaining frame and the needle rollers are installed in the needle roller installation cavity, the inner ring, the second permanent magnet and the inner ring pressure cover are sleeved on the rotating shaft and axially fixed with an elastic retaining ring, the outer ring, the first permanent magnet and the outer ring pressure cover are arranged in the inner cavity set in the housing, and are fixed in the inner cavity by an end cover and bolts.

[0007] Furthermore, the outer circumferential surface of the outer ring and the inner circumferential surface of the inner ring are respectively provided with a first cylindrical mounting cavity and a second cylindrical mounting cavity, and the first mounting cavity and the second mounting cavity are both open at one end in the axial direction.

[0008] Furthermore, the first permanent magnet and the second permanent magnet are cylindrical annular permanent magnets, which have the same magnetization direction and are both magnetized in the radial direction.

[0009] Furthermore, the needle roller is a thick-walled cylindrical structure made of permanent magnetic material, and has the same magnetization direction as the first permanent magnet and the second permanent magnet, and is magnetized radially.

[0010] Furthermore, the retaining frame and the outer ring and the inner ring do not contact or collide with each other, and the collision between the retaining frame and the needle roller corrects the movement of the needle roller and separates the needle roller at certain equidistant positions.

[0011] Furthermore, it also includes a magnetic liquid, which is installed in the needle roller installation cavity and is respectively adsorbed into the sealing gap formed by the outer ring and the left side of the inner ring and the sealing gap formed by the outer ring pressure cover and the inner ring pressure cover to play a sealing role.

[0012] The beneficial effects of the present invention are:

[0013] The technical solution adopted by the present invention is to install cylindrical annular permanent magnets in the installation cavities provided in the outer ring and the inner ring respectively, and form a magnetic field loop in combination with a thick-walled cylindrical needle roller made of permanent magnetic material. Under the action of the magnetic field, the magnetic liquid is firmly adsorbed in the clearance between the needle roller and the inner ring and the outer ring, effectively improving the lubrication ability of the bearing. At the same time, the magnetic circuit of the permanent magnet is connected between the inner ring, the outer ring and the outer ring gland, and the inner ring gland, forming a closed circulating magnetic field, so that the magnetic liquid is adsorbed in the gap formed between the inner and outer rings and the outer ring gland, and the inner ring gland, thereby achieving the self-sealing effect of the lubrication device. The technical problem of deep groove ball bearings that the clearance of deep groove ball bearings is compressed to a very small level, resulting in excessive operating torque, slow response speed, and greatly reducing the operating life of the bearing or even failure is solved. Therefore, compared with the background technology, the present invention can significantly improve the lubrication ability of the bearing under a small radial clearance, reduce the friction torque, and achieve the self-sealing effect of the bearing at the same time, and has the advantages of good lubrication performance, small friction torque and high operating precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 yes Figure 1 A magnified view of part A in FIG.

[0016] In the figure: 1-shaft; 2-dustproof ring; 3-end cover; 4-1-first permanent magnet; 4-2-second permanent magnet; 5-magnetic liquid; 6-needle roller; 7-outer ring; 8-inner ring; 9-housing; 10-cage; 11-outer ring pressure cover; 12-inner ring pressure cover; 13-1-first installation cavity; 13-2-second installation cavity; 14-bolt; 15-elastic retaining ring. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 and Figure 2 As shown, a high-precision magnetic nano film lubrication device in this embodiment includes a rotating shaft 1, an end cover 3, a shell 9 and an elastic retaining ring 15, which also includes a first permanent magnet 4-1, a second permanent magnet 4-2, a plurality of needle rollers 6, an outer ring 7, an inner ring 8, a retaining frame 10, an outer ring pressure cover 11 and an inner ring pressure cover 12, the first permanent magnet 4-1 is mounted on a first mounting cavity 13-1 provided on the outer circumferential surface of the outer ring 7, the outer ring pressure cover 11 is mounted on an open end of the first mounting cavity 13-1 provided on the outer ring 7 and fixes the first permanent magnet 4-1 in the first mounting cavity 13-1, the second permanent magnet 4-2 is mounted on a second mounting cavity 13-2 provided on the inner circumferential surface of the inner ring 8, the inner ring pressure cover 12 is mounted on an open end of the second mounting cavity 13-2 provided on the inner ring 8 and fixes the second permanent magnet 4-2 in the second mounting cavity 13-2, the outer ring 7 and the outer ring pressure cover 11 is correspondingly arranged on the inner ring 8 and the inner ring pressure cover 12, and a needle roller installation cavity is formed between the inner circumference of the outer ring 7 and the outer circumference of the inner ring 8. The plurality of needle rollers (6) are evenly installed in the needle roller holes of the retaining frame (10), and the retaining frame (10) and the needle rollers (6) are installed in the needle roller installation cavity. The inner ring 8, the second permanent magnet 4-2 and the inner ring pressure cover 12 are sleeved on the rotating shaft 1 and axially fixed by the elastic retaining ring 15. The inner ring 8 and the inner ring pressure cover 12 are interference fit with the outer circumference of the rotating shaft 1, and the second permanent magnet 4-2 is in contact with the outer circumference of the rotating shaft 1; the outer ring 7, the first permanent magnet 4-1 and the outer ring pressure cover 11 are arranged in the inner cavity set in the shell 9, and are fixed in the inner cavity by the end cover 3 and the bolts 14. The outer ring 7 and the outer ring pressure cover 11 are interference fit with the inner circumference of the inner cavity of the shell 9, and the first permanent magnet 4-1 is in contact with the inner circumference of the inner cavity of the shell 9. A dust ring 2 is provided in the inner hole of the end cover 3. The outer ring 7 and the inner ring 8 are made of magnetic conductive materials. The outer ring gland 11 and the inner ring gland 12 are made of magnetic conductive materials. The elastic retaining ring 15 is made of non-magnetic conductive materials.

[0019] Furthermore, the outer circumferential surface of the outer ring 7 and the inner circumferential surface of the inner ring 8 are respectively provided with a cylindrical ring-shaped first installation cavity 13-1 and a second installation cavity 13-2, and the first installation cavity 13-1 and the second installation cavity 13-2 are both open at one end in the axial direction.

[0020] Furthermore, the first permanent magnet 4 - 1 and the second permanent magnet 4 - 2 are cylindrical annular permanent magnets, which have the same magnetization direction and are both magnetized radially.

[0021] Furthermore, the needle roller 6 is a thick-walled cylindrical structure made of permanent magnetic material. It has the same magnetization direction as the first permanent magnet 4 - 1 and the second permanent magnet 4 - 2 , and is magnetized radially.

[0022] Furthermore, the retaining frame 10 and the outer ring 7 and the inner ring 8 do not contact or collide with each other. The collision between the retaining frame 10 and the needle roller 6 corrects the movement of the needle roller 6, and at the same time separates the needle roller 6 at certain equidistant positions to evenly distribute the rolling elements, thereby evenly distributing the load.

[0023] Furthermore, it also includes a magnetic liquid 5, which is installed in the needle roller installation cavity and is respectively adsorbed into the sealing gap formed by the outer ring 7 and the left side of the inner ring 8 and the sealing gap formed by the outer ring cover 11 and the inner ring cover 12, and plays a sealing role under the action of the magnetic field in the sealing gap.

Claims

1. A high-precision magnetic nano-thin film lubrication device, comprising a rotating shaft (1), an end cover (3), a housing (9) and an elastic retaining ring (15), characterized in that: The invention also includes a first permanent magnet (4-1), a second permanent magnet (4-2), a plurality of needle rollers (6), an outer ring (7), an inner ring (8), a retaining frame (10), an outer ring pressure cover (11) and an inner ring pressure cover (12), wherein the first permanent magnet (4-1) is mounted on a first mounting cavity (13-1) provided on the outer circumferential surface of the outer ring (7), the outer ring pressure cover (11) is mounted on an open end of the first mounting cavity (13-1) provided on the outer ring (7) and fixes the first permanent magnet (4-1) in the first mounting cavity (13-1), the second permanent magnet (4-2) is mounted on a second mounting cavity (13-2) provided on the inner circumferential surface of the inner ring (8), the inner ring pressure cover (12) is mounted on an open end of the second mounting cavity (13-2) provided on the inner circumferential surface of the inner ring (8) and fixes the second permanent magnet (4-1) in the first mounting cavity (13-1), The magnet (4-2) is fixed in the second installation cavity (13-2), the outer ring (7) and the outer ring pressure cover (11) are correspondingly arranged on the inner ring (8) and the inner ring pressure cover (12), and a needle roller installation cavity is formed between the inner circumference of the outer ring (7) and the outer circumference of the inner ring (8), the plurality of needle rollers (6) are evenly installed in the needle roller holes of the retaining frame (10), the retaining frame (10) and the needle rollers (6) are installed in the needle roller installation cavity, the inner ring (8), the second permanent magnet (4-2) and the inner ring pressure cover (12) are mounted on the rotating shaft (1) and axially fixed by an elastic retaining ring (15), the outer ring (7), the first permanent magnet (4-1) and the outer ring pressure cover (11) are arranged in an inner cavity set in the housing (9), and are fixed in the inner cavity by an end cover (3) and bolts (14); The first permanent magnet (4-1) and the second permanent magnet (4-2) are cylindrical annular permanent magnets, and have the same magnetization direction, and are magnetized radially; the needle roller (6) is a thick-walled cylindrical structure, made of permanent magnetic material, and has the same magnetization direction as the first permanent magnet (4-1) and the second permanent magnet (4-2), and are magnetized radially; It also includes a magnetic liquid (5), which is installed in the needle roller installation cavity and is respectively adsorbed into the sealing gap formed by the outer ring (7) and the left side of the inner ring (8) and the sealing gap formed by the outer ring pressure cover (11) and the inner ring pressure cover (12), thereby playing a sealing role.

2. A high-precision magnetic nano-thin film lubrication device according to claim 1, characterized in that: The outer circumferential surface of the outer ring (7) and the inner circumferential surface of the inner ring (8) are respectively provided with a first cylindrical annular installation cavity (13-1) and a second cylindrical installation cavity (13-2), and the first installation cavity (13-1) and the second installation cavity (13-2) are both open at one end in the axial direction.

3. A high-precision magnetic nano-thin film lubrication device according to claim 1, characterized in that: The retaining frame (10) and the outer ring (7) and the inner ring (8) do not contact or collide with each other. The collision between the retaining frame (10) and the needle roller (6) corrects the movement of the needle roller (6) and separates the needle roller (6) at certain equidistant positions.

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