Bearing assembly and device having the same

Abstract

The present invention provides a bearing assembly and a device having a bearing assembly, wherein the bearing assembly includes: a magnet; at least two bearing inner rings, at least one of which is arranged at one end of the magnet and at least one is arranged at the other end of the magnet, each of which is provided with a first raceway; a bearing outer ring, which is an integrated structure, arranged on the outside of each bearing inner ring and surrounds the outside of the magnet, and a second raceway is provided on the bearing outer ring at a position corresponding to the first raceway; a rolling element, which is installed between the first raceway and the second raceway. Since the bearing outer ring is an integrated structure, the bearing outer ring of the bearing assembly will not be axially offset, thereby extending the life of the bearing assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a bearing assembly and a device having the bearing assembly. Background Art

[0002] The permanent magnet ring of the traditional surface-mounted permanent magnet motor is installed on the rotor shaft and is independent of the shaft bearing. The coaxiality and positioning accuracy of the permanent magnet installed in this way are relatively poor. In addition, due to the magnetic force of the permanent magnet, the outer ring of the bearing will have a slight axial offset, affecting the bearing clearance and thus reducing the bearing life, which does not meet the high-precision and long-life requirements of the motor. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the outer ring of the bearing will undergo axial displacement when subjected to the magnetic force of the permanent magnet core, thereby providing a bearing assembly whose outer ring is not prone to axial displacement and a device having a bearing assembly.

[0004] In order to solve the above technical problems, the present invention provides a bearing assembly, comprising:

[0005] magnet;

[0006] There are at least two bearing inner rings, at least one of which is arranged at one end of the magnet and at least one is arranged at the other end of the magnet, and each of the bearing inner rings is provided with a first raceway;

[0007] The outer ring of the bearing is an integrated structure, which is arranged on the outer side of each inner ring of the bearing and surrounds the outer side of the magnet, and a second raceway is arranged on the outer ring of the bearing at a position corresponding to the first raceway;

[0008] The rolling element is installed between the first raceway and the second raceway.

[0009] The bearing inner ring is symmetrically arranged on both sides of the magnet.

[0010] The bearing inner rings are provided with two.

[0011] The magnet is a permanent magnet.

[0012] The magnet is ring-shaped.

[0013] Both ends of the magnet are in contact with and connected to the end surface of the bearing inner ring.

[0014] The magnet is connected between the two bearing inner rings by interference fit, so that the bearing inner rings exert pre-pressure on the magnet.

[0015] The inner diameter of the bearing outer ring is greater than the outer diameter of the magnet, so that there is a gap between the bearing outer ring and the magnet.

[0016] The rolling element is a deep groove ball.

[0017] The deep groove ball is a ceramic ball.

[0018] The present invention also provides a device with a bearing assembly, comprising the bearing assembly.

[0019] The device is a motor, comprising a rotating shaft and a bearing assembly mounted on the rotating shaft.

[0020] The magnet is connected to the rotating shaft by interference fit.

[0021] The magnet is installed at the middle position of the rotating shaft.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. The present invention provides a bearing assembly, wherein the outer ring of the bearing is arranged on the outside of each bearing inner ring and surrounds the outside of the magnet. When the two sides of the magnet generate magnetic force on the outer rings of the bearings on the corresponding sides respectively, since the outer rings of the bearings are an integrated structure, when the outer ring of the bearings on one side may be axially offset toward the other side due to the magnetic force, the outer ring of the bearings on the other side may also be axially offset toward the opposite side due to the magnetic force. Therefore, the outer rings of the bearings on both sides constrain each other so that neither of them can be axially offset, thereby extending the life of the bearing assembly.

[0024] 2. The present invention provides a bearing assembly, wherein the inner ring of the bearing is symmetrically arranged on both sides of the magnet, so that the force on the left and right sides of the bearing assembly is uniform.

[0025] 3. The present invention provides a bearing assembly, wherein the bearing inner rings are provided with two, and the structure is simple, which facilitates the assembly of the bearing assembly.

[0026] 4. In a bearing assembly provided by the present invention, the magnet is a permanent magnet, which can generate magnetism for a long time, thereby extending the service life of the bearing assembly.

[0027] 5. The present invention provides a bearing assembly, wherein the magnet is annular, generates stable magnetism, and is convenient for assembly with the inner ring of the bearing, and for assembling the bearing assembly onto the motor shaft.

[0028] 6. The present invention provides a bearing assembly, in which both ends of the magnet are contact-connected to the end face of the inner ring of the bearing, and the inner ring of the bearing limits the axial position of the magnet, which can improve the positioning accuracy of the magnet and avoid the axial movement of the magnet during use to affect the bearing clearance.

[0029] 7. The present invention provides a bearing assembly, wherein the magnet is connected between the two bearing inner rings by interference fit, so that the bearing inner rings apply pre-pressure to the magnet, and the bearing inner rings fix the axial position of the magnet, thereby further improving the positioning accuracy of the magnet and preventing the magnet from axial movement.

[0030] 8. In a bearing assembly provided by the present invention, the inner diameter of the bearing outer ring is larger than the outer diameter of the magnet, so that there is a gap between the bearing outer ring and the magnet, which can ensure the normal rotation of the magnet.

[0031] 9. The present invention provides a bearing assembly, wherein the rolling element is a deep groove ball, so that the bearing assembly can be suitable for high-speed rotation.

[0032] 10. In a bearing assembly provided by the present invention, the deep groove ball is a ceramic ball, which has high strength and will not be affected by the magnetic force of a magnet.

[0033] 11. The present invention provides a device with a bearing assembly, which has the above-mentioned bearing assembly. Since the bearing assembly will not have axial deviation, the service life of the device is increased.

[0034] 12. The present invention provides a device with a bearing assembly, including a rotating shaft and a bearing assembly installed on the rotating shaft. The bearing assembly of the motor will not have axial displacement, thereby extending the service life of the motor. In addition, since the magnet is installed on the inner side of the inner ring of the bearing, the length of the rotating shaft can be reduced, which is conducive to reducing the size of the motor.

[0035] 13. The present invention provides a bearing assembly device, wherein the magnet is connected to the rotating shaft by interference fit, thereby ensuring the assembly accuracy and bonding force between the magnet and the rotating shaft. The magnet will not move on the rotating shaft, which is beneficial to the high-speed rotation of the rotating shaft.

[0036] 14. The present invention provides a device with a bearing assembly, wherein the magnet is installed in the middle of the rotating shaft, so that the rotating shafts on the left and right sides of the bearing assembly have the same effect on the bearing assembly, thereby obtaining a better overall supporting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1is a cross-sectional view of a bearing assembly provided in embodiment 1 of the present invention;

[0039] Figure 2 is a cross-sectional view of a device having a bearing assembly provided in Embodiment 2 of the present invention;

[0040] Description of reference numerals:

[0041] 1-bearing inner ring; 2-bearing outer ring; 3-rolling element;

[0042] 4-magnet; 5-rotating shaft. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Example 1

[0048] This embodiment provides a specific implementation of a bearing assembly, including a magnet 4 , a bearing inner ring 1 , a bearing outer ring 2 , and a rolling element 3 .

[0049] The magnet 4 is a permanent magnet and is annular. In an alternative embodiment, the magnet 4 is not annular, for example, it is composed of two or more sector magnets with an arc less than 180°, and two adjacent sector magnets are not in contact and are connected by a fixing frame.

[0050] There are at least two bearing inner rings 1, and at least one is arranged at one end of the magnet 4, and at least one is arranged at the other end of the magnet 4, and each of the bearing inner rings 1 is provided with a first raceway. In this embodiment, there are two bearing inner rings 1, and they are symmetrically arranged on both sides of the magnet 4. This arrangement makes the force on the left and right sides of the bearing assembly uniform. Of course, in an alternative embodiment, the number of bearing inner rings 1 is 4, 6, etc., and they are symmetrically arranged on both sides of the magnet 4. In another alternative embodiment, the number of bearing inner rings 1 is 3, one is arranged on one side of the magnet 4, and 2 are arranged on the other side, or the number of bearing inner rings 1 is 5, 2 are arranged on one side of the magnet 4, and 3 are arranged on the other side, or 1 is arranged on one side, and 4 are arranged on the other side.

[0051] The bearing outer ring 2 is an integrated structure, which is arranged on the outside of each bearing inner ring 1 and surrounds the outside of the magnet 4. A second raceway is provided on the bearing outer ring 2 at a position corresponding to the first raceway, and the rolling body 3 is installed between the first raceway and the second raceway.

[0052] Since the bearing outer ring 2 is an integrated structure, when the bearing outer ring 2 on one side may be axially offset toward the other side due to the magnetic force, the bearing outer ring 2 on the other side may also be axially offset toward the opposite side due to the magnetic force. Therefore, the bearing outer rings 2 on both sides constrain each other so that neither of them can be axially offset, thereby ensuring the life of the bearing assembly.

[0053] In this embodiment, the two ends of the magnet 4 are in contact with the end face of the bearing inner ring 1. During assembly, the magnet 4 is connected between the two bearing inner rings 1 with an interference fit so that the bearing inner ring 1 applies a pre-pressure to the magnet 4. The axial position of the magnet 4 is fixed by the bearing inner ring 1 to improve the positioning accuracy of the magnet 4, so that the magnet 4 will not move axially, and avoid the magnet 4 moving axially during use and affecting the bearing clearance. In an alternative embodiment, the two ends of the magnet 4 do not contact the end face of the bearing inner ring 1. In another alternative embodiment, the two ends of the magnet 4 are connected to the end face of the bearing inner ring 1 by bonding.

[0054] like Figure 1 As shown, the inner diameter of the bearing outer ring 2 is larger than the outer diameter of the magnet 4 , so that there is a gap between the bearing outer ring 2 and the magnet 4 , which can ensure the normal rotation of the magnet 4 .

[0055] In this embodiment, in order to make the bearing assembly suitable for high-speed rotation, deep groove balls are selected as rolling elements 3. Ceramic balls are selected as rolling elements 3 because they have high strength and will not be affected by the magnetic force of magnets 4. Of course, in an alternative embodiment, rollers can be selected as rolling elements 3.

[0056] Example 2

[0057] This embodiment provides a device having a bearing assembly, such as Figure 2 As shown, the device has the bearing assembly provided in the above embodiment. Since the bearing assembly does not have axial displacement and does not affect the bearing clearance, the service life of the device is extended.

[0058] In this embodiment, the device with a bearing assembly is a motor, including a rotating shaft 5 and a bearing assembly mounted on the rotating shaft 5. The bearing assembly of the motor will not be axially offset, thereby extending the service life of the motor, and because the magnet 4 is mounted on the inner side of the bearing inner ring 1, the length of the rotating shaft 5 can be reduced, which is conducive to reducing the size of the motor.

[0059] In this embodiment, the magnet 4 is connected to the shaft 5 by interference fit, which ensures the assembly accuracy and bonding force of the magnet 4 and the shaft 5. The magnet 4 will not move on the shaft 5, which is conducive to the high-speed rotation of the shaft 5.

[0060] The magnet 4 is installed in the middle of the rotating shaft 5 so that the rotating shafts 5 on the left and right sides of the bearing assembly exert a similar force on the bearing assembly, thereby obtaining a better overall supporting effect.

[0061] During installation, first fix the magnet 4 in the middle position of the rotating shaft 5 by means of an interference fit, install the bearing inner ring 1 symmetrically on both sides of the magnet 4, and make the bearing inner ring 1 and the magnet 4 have an interference fit, that is, make the bearing inner ring 1 squeeze the magnet 4, so that the bearing inner ring 1 applies pre-pressure to the magnet 4, then install the bearing outer ring 2 and the rolling element 3, and the bearing assembly is fixed on the rotating shaft 5, and can rotate at high speed with the rotating shaft 5.

[0062] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A bearing assembly, characterized in that: include: Magnet (4); There are at least two bearing inner rings (1), at least one of which is arranged at one end of the magnet (4) and at least one is arranged at the other end of the magnet (4), and each of the bearing inner rings (1) is provided with a first raceway; The bearing outer ring (2) is an integrated structure, arranged on the outside of each of the bearing inner rings (1) and surrounding the outside of the magnet (4), and a second raceway is provided on the bearing outer ring (2) at a position corresponding to the first raceway; The rolling body (3) is installed between the first raceway and the second raceway, and the two ends of the magnet (4) are contact-connected to the end surface of the bearing inner ring (1). The magnet (4) is connected between the two bearing inner rings (1) by interference fit, so that the bearing inner ring (1) applies a pre-pressure to the magnet (4).

2. A bearing assembly according to claim 1, characterized in that: The bearing inner ring (1) is symmetrically arranged on both sides of the magnet (4).

3. A bearing assembly according to claim 2, characterized in that: The bearing inner rings (1) are provided with two.

4. A bearing assembly according to claim 1, characterized in that: The magnet (4) is a permanent magnet.

5. A bearing assembly according to claim 1, characterized in that: The magnet (4) is ring-shaped.

6. A bearing assembly according to claim 1, characterized in that: The inner diameter of the bearing outer ring (2) is greater than the outer diameter of the magnet (4), so that a gap exists between the bearing outer ring (2) and the magnet (4).

7. A bearing assembly according to claim 1, characterized in that: The rolling body (3) is a deep groove ball.

8. A bearing assembly according to claim 7, characterized in that: The deep groove ball is a ceramic ball.

9. A device having a bearing assembly, characterized in that: A bearing assembly according to any one of claims 1 to 8.

10. A device having a bearing assembly according to claim 9, characterized in that: The device is a motor, comprising a rotating shaft (5) and a bearing assembly mounted on the rotating shaft (5).

11. A device having a bearing assembly according to claim 10, characterized in that: The magnet (4) is connected to the rotating shaft (5) by interference fit.

12. A device having a bearing assembly according to claim 11, characterized in that: The magnet (4) is installed at the middle position of the rotating shaft (5).

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