CN106972680B

CN106972680B - Bearing assembly and motor with same

Info

Publication number: CN106972680B
Application number: CN201710330956.1A
Authority: CN
Inventors: 刘思苑; 卢素华; 贾武豪
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2017-05-11
Filing date: 2017-05-11
Publication date: 2023-10-03
Anticipated expiration: 2037-05-11
Also published as: CN106972680A

Abstract

The application provides a bearing assembly and a motor with the same. A bearing assembly, comprising: a bearing part; and the vibration reduction part is connected with the bearing part and is used for being abutted with the mounting foundation. The vibration reduction part is directly arranged in a mode of being connected with the bearing part, so that the vibration reduction part arranged on the bearing part is directly abutted against the mounting foundation, and the problem that the bearing part generates axial movement is effectively avoided. Meanwhile, the situation that the bearing part collides with the installation foundation is avoided, the noise of the motor with the bearing assembly is effectively reduced, and the use experience of a user is improved.

Description

Bearing assembly and motor with same

Technical Field

The application relates to the technical field of motor equipment, in particular to a bearing assembly and a motor with the same.

Background

As the living standard of people increases, the noise requirements of various industries become more stringent. For the three-phase asynchronous motor, the problems of high noise and harshness exist all the time due to high power and high rotating speed, and the physical and psychological health of people is affected. How to reduce motor noise has become the most important process control link and research direction of three-phase asynchronous motors.

The bearing is one of the most important and precise parts of the motor, and has the functions of supporting a mechanical rotating body, reducing the rotation friction coefficient, improving the rotation precision and the like. Bearings are also the most prone to failure, and most motor-generated harshness noise is due to bearing design problems.

In the running process of the three-phase asynchronous motor, the motor rotor is subjected to radial electromagnetic tension generated by the stator winding, axial electromagnetic tension, axial suction generated by fan blade running, axial stress caused by unbalanced assembly and other axial force, axial movement is generated, and the bearing matched with the shaft is in movement, so that the bearing collides with the end cover, and the bearing is damaged. The bearing can conduct vibration to the end cover when colliding with the end cover, so that the end cover is caused to resonate, and noise is increased.

In the prior art, most motor manufacturers are additionally provided with a wave spring washer in a bearing chamber of a front end cover of the motor when the motor is assembled, so that vibration noise of the motor is restrained. However, if the axial machining size deviation of machined parts such as a machine base, an end cover and the like is large, the axial pretightening force of the motor is small, and the motor bearing has large axial movement. While the relaxed wave spring washer is prone to high frequency noise from collisions with the bearing.

Disclosure of Invention

The application mainly aims to provide a bearing assembly and a motor with the same, so as to solve the problem that in the prior art, axial movement of a motor bearing is large.

In order to achieve the above object, according to one aspect of the present application, there is provided a bearing assembly comprising: a bearing part; and the vibration reduction part is connected with the bearing part and is used for being abutted with the mounting foundation.

Further, a vibration damping portion is provided on at least one end face of the bearing portion.

Further, the vibration damping portion includes: the vibration damping body is of a hollow cylindrical structure, and the inner diameter of the first end of the vibration damping body is gradually increased from inside to outside.

Further, a line connecting a projection line of a cross section of the inner wall of the first end in the axial direction of the vibration damping body and the radial direction of the vibration damping body has an angle α, wherein α is 20 ° or more and 60 ° or less.

Further, the length of the vibration damping body is L, and the length of the first end of the vibration damping body is L1, wherein l1=0.5l.

Further, l1= Δi++Δl, where L1 is the length of the first end of the damping body; Δi is the compression of the damping body; Δl is the actual reserved depth.

Further, an annular grease groove is provided on an inner peripheral surface of a second end of the vibration damping body opposite to the first end.

Further, the second end is provided with a shape retaining groove for accommodating the metal gasket, and the minimum inner diameter of the groove wall of the shape retaining groove on one side close to the axis of the vibration reduction body is larger than the maximum inner diameter of the annular fat groove.

Further, the vibration damping portion includes: and the wave spring washer is welded with the bearing part, or the wave spring washer and the bearing part are integrally formed.

Further, the bearing portion includes: a bearing outer ring; the bearing inner ring is sleeved in the bearing outer ring, the bearing inner ring is rotatably arranged relative to the bearing outer ring, and the vibration reduction part is connected with the bearing outer ring.

According to another aspect of the present application there is provided an electrical machine comprising a bearing assembly as described above.

By applying the technical scheme of the application, the vibration reduction part is directly arranged in a form of being connected with the bearing part, so that the vibration reduction part arranged on the bearing part is directly abutted against the mounting base, and the problem of axial movement of the bearing part is effectively avoided. Meanwhile, the situation that the bearing part collides with the installation foundation is avoided, the noise of the motor with the bearing assembly is effectively reduced, and the use experience of a user is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic exploded view of an embodiment of a bearing assembly according to the present application;

FIG. 2 illustrates a schematic diagram of an assembled configuration of the embodiment of the bearing assembly of FIG. 1;

FIG. 3 illustrates a schematic structural view of an embodiment of the bearing assembly and end cap assembly of FIG. 1;

FIG. 4 illustrates a schematic internal structure of an embodiment of the bearing assembly of FIG. 1;

FIG. 5 shows an enlarged schematic view of the structure of FIG. 4 at A;

FIG. 6 is a schematic view showing the structure of the assembly of the vibration damping portion and the iron plate in FIG. 1;

FIG. 7 illustrates a schematic structural view of a bearing assembly according to another embodiment of the present application from a first perspective;

fig. 8 shows a schematic structural view of the bearing assembly embodiment of fig. 7 from a second perspective.

Wherein the above figures include the following reference numerals:

10. a bearing part; 11. a bearing outer ring; 12. a bearing inner ring; 13. steel balls; 14. a retainer; 15. a rivet; 16. a retainer; 17. a seal ring;

20. a vibration damping section; 21. a vibration damping body; 30. an annular fat tank; 40. a shape-retaining groove; 50. a wave spring washer; 60. an end cap; 70. a rotating shaft; 80. iron sheet.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

As shown in connection with fig. 1-8, a bearing assembly is provided according to an embodiment of the present application.

Specifically, the bearing assembly includes a bearing portion 10 and a vibration damping portion 20. The vibration damping portion 20 is connected to the bearing portion 10, and the vibration damping portion 20 is adapted to abut against the mounting base.

In the present embodiment, the vibration damping portion 20 is provided on at least one end surface of the bearing portion 10. This arrangement effectively avoids the problem of loud noise caused by collision of the bearing portion 10 with the mounting base. Wherein the mounting base is an end cap 60.

Specifically, the vibration damping portion 20 includes a vibration damping body 21. The vibration damping body 21 is a hollow cylindrical structure, and the inner diameter of the first end of the vibration damping body 21 gradually increases from inside to outside. As shown in fig. 6, the inner wall surface of the first end of the damper body 21 is formed in a flare shape, which can effectively increase the reliability of the damper portion 20.

Further, a line connecting a projection line of a cross section of the inner wall of the first end in the axial direction of the vibration damping body 21 and the radial direction of the vibration damping body 21 has an angle α, wherein 20 ° or more and 60 ° or less. Referring to fig. 6 again, the length of the damping body 21 is L, the length of the first end of the damping body 21 is L1, where l1=0.5l, and l1= Δi+Δl, where L1 is the length of the first end of the damping body 21, Δi is the compression amount of the damping body 21, and Δl is the actual reserved depth. The front end cover of the standard motor is reserved with a certain gap for placing the wave spring washer according to different base numbers, and the certain gap is the actual reserved depth delta L which is more than or equal to 1.5mm and less than or equal to 2mm. The arrangement is that the wave spring washer is not required to be installed in a certain installation gap when the motor is machined and assembled, and meanwhile, the motor with the bearing assembly has good noise reduction effect.

In order to further enhance the vibration damping effect of the vibration damping portion, an annular grease groove 30 is provided on the inner peripheral surface of the second end of the vibration damping body 21 opposite to the first end. The annular grease groove and the bearing inner ring form a pressure buffer chamber and a storage chamber of grease, so that leakage of the grease can be prevented, and the grease oozing from the bearing or dust and impurities immersed into the bearing from the outside are stored in the annular groove to form an alicyclic ring, so that the sealing effect is enhanced.

Preferably, the second end of the damping body 21 is provided with a shape retaining groove 40. The shape retaining groove 40 is for accommodating a metal gasket, and a minimum inner diameter of a groove wall of the shape retaining groove 40 on a side close to an axis of the vibration damping body 21 is larger than a maximum inner diameter of the annular fat groove 30. The metal gasket can be prevented from being worn by being in direct contact with the rotating shaft 70, and meanwhile, the metal gasket can ensure that the vibration damping body 21 is not easy to deform when being extruded, so that the reliability of the vibration damping body 21 is improved. Preferably, the metal shim may be an iron plate 80.

In another embodiment of the present application, the vibration damping portion 20 includes a wave spring washer 50, and the wave spring washer 50 is welded to the bearing portion 10. Of course, in the case where the wave spring washer 50 is ensured to have a vibration damping effect, the wave spring washer 50 and the bearing portion 10 may be integrally formed. This arrangement can avoid the situation where the wave spring washer 50 separate from the vibration damping body 21 is disposed in the clearance gap to cause increased noise.

As shown in fig. 1, the bearing portion 10 includes a bearing outer ring 11 and a bearing inner ring 12. The bearing inner ring 12 is sleeved in the bearing outer ring 11, the bearing inner ring 12 is rotatably arranged relative to the bearing outer ring 11, and the vibration reduction part 20 is connected with the bearing outer ring 11. This arrangement can prevent the bearing assembly from being moved in the axial direction and causing an increase in noise.

The bearing assembly of the above embodiment may also be used in the technical field of motor equipment, i.e. according to another aspect of the application, an electric motor is provided. The motor includes a bearing assembly, which is the bearing assembly of the above embodiments.

Specifically, in the prior art, the specifications of the wave spring washers used for the motors corresponding to different models are different, and various wave spring washers are required to be purchased and combed. In order to install the wave spring washer, an installation procedure is needed, working hours are wasted, and under the condition that the axial machining size deviation of a machined part is large, the axial pretightening force of a motor is small, so that large axial movement and obvious noise are caused.

By adopting the bearing assembly in the embodiment of the application, the motor is convenient and quick to install, the motor assembly flow is simplified, the bearing is provided with the vibration reduction structure, the bearing can effectively inhibit the axial vibration of the motor, the motor noise is reduced, the motor stably operates, the material types are reduced, and the motor cost is saved.

Specifically, the bearing structure comprises five parts, namely a bearing outer ring 11, rolling bodies, namely steel balls 13, retainers (14 and 16) and a vibration reduction part, wherein the two retainers are connected through rivets 15. The vibration reduction part is made of fluororubber and is arranged on the outer ring of the bearing and acts between the outer ring of the bearing and the end cover, and the vibration reduction part is compressed to generate pretightening force after the motor is assembled, so that the axial movement of the motor is restrained, the natural vibration frequency of the fluororubber is very low, and noise can not be generated even if collision occurs.

As shown in fig. 4 and 5, the rolling element is installed between the outer ring and the inner ring of the bearing, the rolling element is fixed on the raceway through the retainers on both sides, the sealing ring 17 is installed on the dust-proof cover groove of the outer ring of the bearing, the inner lip of the sealing ring forms a seal with the dust-proof groove of the inner ring of the bearing, the vibration damping body is a vibration damping bearing sealing ring with special design, the inner edge of the vibration damping body is installed on the dust-proof cover groove of the outer ring of the bearing, the plane of the inner ring of the bearing forms a seal with the inner ring of the bearing, meanwhile, the front edge is provided with a space grease groove, namely an annular grease groove, the grease groove is 0.5mm deep and 1mm wide, the grease groove and the inner ring form a pressure buffer chamber and a grease storage chamber, the leakage of the grease can be prevented, and the grease oozing from the bearing or dust and impurities immersed into the bearing from the outside are stored in the annular groove, so that the sealing effect is enhanced.

As shown in fig. 6, the ring-shaped iron sheet formed by stamping is sleeved into the vibration damping body made of fluororubber so as to keep the shape of the vibration damping body sealing ring, the thickness h=1-2 mm of the ring-shaped iron sheet, and the thickness of the ring-shaped iron sheet can be set to be inconsistent for motors with different central heights. The inclination angle of the inner peripheral surface of the vibration reduction body is alpha, and alpha is more than or equal to 20 degrees and less than or equal to 60 degrees, so that the vibration reduction body cannot deform inwards to contact with the bearing inner ring when stressed. The vibration damping body has an outer ring diameter D, an inner ring diameter D1, a total height L, and an effective compression portion height l1=l/2.

As shown in fig. 3, the damping body is deformed by the extrusion of the end cap 60 and the bearing outer ring to generate an elastic force, and the damping body is mounted on the bearing outer ring, and the elastic force is reacted on the bearing outer ring to play a role of pre-tightening. Let the compression of damping body be Δi, the elastic modulus of fluororubber be h=7.8mpa, damping body and end cover' S area of contact be S, damping body receives the elastic stress that the extrusion produced to be F, then elastic stress:

wherein:

the method can obtain:

in general, according to different base numbers, the front end cover will reserve a gap of 1.5-2 mm for placing the wave spring washer, so the height l1=Δi+ (1.5-2) of the effective compression part of the vibration damping body can be designed.

Therefore, according to the pretightening force required by standard motors of different types in the standard JB/T7590 of the wave spring gasket and the corresponding structural size of the standard motors of the types, the required compression amount can be calculated, so that different sealing ring sizes can be designed.

By adopting the bearing assembly, a wave spring washer does not need to be installed, the cost of the motor is reduced, the material types of the motor are reduced, the assembly process is simplified, the production efficiency is improved, meanwhile, no other object exists between the bearing and the end cover of the motor, and the motor does not generate additional noise during operation.

As shown in fig. 7 and 8, the wave spring washer can be welded to the bearing outer ring, and the wave spring washer and the bearing outer ring are welded into a whole, so that the wave spring washer and the bearing outer ring have consistent vibration frequency, and high-frequency additional noise cannot be generated when the motor vibrates.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application, as generally described. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the application.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bearing assembly, comprising:

a bearing part (10);

a vibration damping portion (20), wherein the vibration damping portion (20) is connected with the bearing portion (10), and the vibration damping portion (20) is used for abutting against an installation foundation;

the vibration damping portion (20) includes: the vibration damper comprises a vibration damper body (21), wherein the vibration damper body (21) is of a hollow cylindrical structure, and the inner diameter of the first end of the vibration damper body (21) gradually increases from inside to outside; an included angle alpha is formed between a projection line of a cross section of the inner wall of the first end along the axial direction of the vibration reduction body (21) and a connecting line of the vibration reduction body (21) along the radial direction, wherein alpha is more than or equal to 20 degrees and less than or equal to 60 degrees;

an annular grease groove (30) is formed in the inner peripheral surface of a second end, opposite to the first end, of the vibration damping body (21);

the second end is provided with a shape retaining groove (40), the shape retaining groove (40) is used for accommodating a metal gasket, and the minimum inner diameter of the groove wall of the shape retaining groove (40) on one side, close to the axis of the vibration reduction body (21), is larger than the maximum inner diameter of the annular fat groove (30).

2. Bearing assembly according to claim 1, wherein the vibration damping portion (20) is provided on at least one end face of the bearing portion (10).

3. Bearing assembly according to claim 1, wherein the length of the damping body (21) is L and the length of the first end of the damping body (21) is L1, wherein l1=0.5L.

4. The bearing assembly according to claim 3, wherein said l1= Δi+ "Δl, wherein,

the L1 is the length of the first end of the vibration reduction body (21);

the Δi is the compression amount of the vibration damping body (21);

the Δl is the actual reserved depth.

5. Bearing assembly according to claim 1, wherein the vibration reduction portion (20) comprises:

and the wave spring washer (50) is welded with the bearing part (10), or the wave spring washer (50) and the bearing part (10) are integrally formed.

6. Bearing assembly according to claim 1, wherein the bearing portion (10) comprises:

a bearing outer ring (11);

the bearing inner ring (12), the bearing inner ring (12) is sleeved in the bearing outer ring (11), the bearing inner ring (12) is rotatably arranged relative to the bearing outer ring (11), and the vibration reduction part (20) is connected with the bearing outer ring (11).

7. An electric machine comprising a bearing assembly, characterized in that the bearing assembly is a bearing assembly according to any one of claims 1 to 6.