CN210468985U

CN210468985U - Motor bearing pretightening force loading structure and motor

Info

Publication number: CN210468985U
Application number: CN201921962071.4U
Authority: CN
Inventors: 尹凌飞
Original assignee: Suzhou Runhao Motor Co ltd
Current assignee: Suzhou Runhao Motor Co ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-05-05
Anticipated expiration: 2029-11-13

Abstract

The utility model discloses a motor bearing pretightning force loading structure and motor, the motor includes support and bearing, sets up the bearing room in the support, and the bearing is installed in the bearing room, sets up the breach of at least three confession to bearing loading pretightning force on the interior terminal surface of bearing room, and the bearing includes the bearing inner race, the bearing inner race with the interior fixed surface of bearing room after the corresponding pretightning force of bearing loading. The utility model discloses a set for the pretension value in advance on the bearing after fixed with the bearing to for the bearing provides accurate bearing pretightning force, make the motor can be at reliable operation under higher rotational speed.

Description

Motor bearing pretightening force loading structure and motor

Technical Field

The utility model relates to a motor especially relates to a motor bearing pretightning force loading structure and motor.

Background

Along with the improvement of the energy consumption standard of the industry of dust collectors and the demand of consumers on the miniaturization of portable dust collectors, the sound requirement of the consumers on the dust collectors is higher and higher, so that how to enable the electric fan of the dust collectors to meet the requirements of small volume and silence and improve efficiency becomes a great technical problem of research in the industry.

Researches find that the vibration and noise generation of the motor have a great relationship with the pretightening force of the bearing, and the proper pretightening force of the bearing can ensure that the motor has small vibration, low noise and long service life.

The loading mode of the pre-tightening force of the existing motor bearing is realized by installing a wave washer in the motor, as shown in fig. 1a and fig. 1b, after the screw is fastened, the end surface of the wave washer 70 is pressed against the end surface of the bearing outer ring, so that the wave washer 70 can provide axial pre-tightening force for the bearing 40 after being compressed, and the value of the pre-tightening force is ensured by the compression amount of the wave washer 70.

However, practice proves that the scheme has the defects that the bearing pretightening force cannot be accurately guaranteed, the vibration and noise of the motor exceed standards, the qualified rate is low, and the like, and the condition that the wave-shaped gasket is not installed easily occurs during assembly.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a motor bearing pretightning force loading structure and motor.

In order to achieve the above object, the utility model provides a following technical scheme: the motor comprises a support and a bearing, a bearing chamber is arranged in the support, the bearing is installed in the bearing chamber, at least three notches for loading the bearing with pretightening force are formed in the inner end face of the bearing chamber, the bearing comprises a bearing outer ring, and the bearing outer ring is fixed with the inner surface of the bearing chamber after the bearing is loaded with the corresponding pretightening force.

Preferably, the notch is arranged on the inner end face of the bearing chamber corresponding to the position of the bearing outer ring.

Preferably, the notch is matched with a pressure head of the bearing pretightening force tool, and the pressure head of the bearing pretightening force tool is propped against the end face of the bearing outer ring through the notch.

Preferably, the notch is formed by extending and protruding outwards from the inner end surface of the bearing chamber.

Preferably, the notch is a square notch with three sides being right-angle sides.

Preferably, a plurality of the notches are evenly distributed along the circumferential direction of the inner end surface of the bearing chamber.

Preferably, the bearing outer race is adhesively secured to the inner surface of the bearing chamber.

The invention also provides another technical scheme: a motor comprises the motor bearing pretightening force loading structure.

Preferably, the bracket comprises a lower bracket in which the bearing chamber is disposed.

Preferably, the bracket further comprises an upper bracket, and the upper bracket and the lower bracket are fixed through screws.

The utility model has the advantages that:

1. the bearing is fixed after the pre-tightening force value is set on the bearing in advance, so that accurate pre-tightening force of the bearing is provided for the bearing, and the motor can reliably run at a higher rotating speed.

2. Reduce vibration and noise when the motor runs at high speed, and improve the qualification rate of products.

3. Because the wave washer is not needed, the parts are reduced, and therefore, the cost is reduced.

Drawings

FIG. 1a is a schematic structural diagram of a loading manner of a pre-tightening force of a bearing of a conventional motor;

FIG. 1B is a schematic cross-sectional view taken along line B-B of FIG. 1 a;

fig. 2a is a schematic structural diagram of the present invention;

FIG. 2B is a schematic cross-sectional view along the direction B-B of the present invention;

fig. 3a and 3b are schematic structural diagrams of the front and back sides of the lower bracket of the present invention, respectively.

Reference numerals:

10. the bearing pre-tightening device comprises an upper support, 20 parts of a lower support, 21 parts of a bearing chamber, 22 parts of a notch, 30 parts of a stator, 40 parts of a bearing, 50 parts of a bearing pre-tightening tool, 60 parts of a screw, 70 parts of a wave washer.

Detailed Description

The technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.

The utility model discloses a motor bearing pretightning force loading structure and motor is fixed the bearing through setting for the pretightning force value on the bearing in advance after to for the bearing provides accurate bearing pretightning force, make the motor can be reliable operation under higher rotational speed, and reduced vibration and noise when the motor high-speed operation, improve the qualification rate of product, reduce product cost. The brushless motor is mainly used for the dust collector.

Referring to fig. 2a and 2b, the embodiment of the present invention discloses a motor, which includes an upper bracket 10, a lower bracket 20 and a stator 30, wherein the upper bracket 10 and the lower bracket 20 are respectively fixed on the upper and lower sides of the stator 30, when in use, the upper and

lower brackets

10 and 20 can be fixedly connected by screws, and the lower bracket 20 is provided with a motor bearing pretightening force loading structure, of course, in other embodiments, the upper bracket 10 can also be provided with a motor bearing pretightening force loading structure, or the upper and

lower brackets

10 and 20 are both provided, which is not limited herein.

In this embodiment, as shown in fig. 3a and 3b, a bearing chamber 21 for accommodating the bearing 40 is provided in the lower bracket 20, and the bearing 40 is installed in the bearing chamber 21.

At least 3 notches 22 are formed in the inner end face of the bearing chamber 21, and the notches 22 are used for being matched with a pressure head of the bearing pre-tightening force tool 50. The notch 22 is arranged on the inner end surface of the bearing chamber 21 corresponding to the position of the bearing outer ring, and the pressure head of the bearing pre-tightening force tool 50 with the pre-tightening force value set is pushed onto the end surface of the bearing outer ring through the notch 22, so that proper pre-tightening force is provided for the bearing 40.

Each notch 22 is formed by extending and protruding outwards from the inner end surface of the bearing chamber 21, in this embodiment, 3 notches 22 are arranged on the inner end surface of the bearing chamber 21, each notch 22 is a square notch with three sides being right-angle sides, and the 3 notches 22 are evenly distributed along the circumferential direction of the inner end surface of the bearing chamber 21. Of course, in other embodiments, the number, shape, and arrangement of the indentations 22 may not be limited to those defined herein.

After the bearing pre-tightening force tool 50 applies a preset pre-tightening force to the bearing 40, the bearing 40 and the bearing chamber 21 are fixed, so that the pre-tightening force applied to the bearing 50 is fixed to a fixed value. In this embodiment, the bearing outer race and the inner surface of the bearing chamber 21 are fixed by gluing. Specifically, after the bearing outer ring is coated with glue and the lower bracket 20 is fastened by the screw 60, the bearing pre-tightening force tool 50 is kept for a certain time, after the glue is cured, the bearing outer ring is adhered to the inner surface of the bearing chamber 21 of the lower bracket 20, the bearing pre-tightening force is fixed to a proper value, the bearing pre-tightening force tool 50 is removed, and the motor assembly is completed. In other embodiments, other means of attachment may be used in addition to gluing.

The technical contents and features of the present invention have been disclosed as above, however, those skilled in the art can still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention, therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications without departing from the present invention, and should be covered by the claims of the present patent application.

Claims

1. The utility model provides a motor bearing pretightning force loading structure, the motor includes support and bearing, set up the bearing room in the support, the bearing install in the bearing room, its characterized in that, set up the breach that supplies to bearing loading pretightning force on the inner end face of bearing room, the bearing includes the bearing inner race, the bearing inner race with after the bearing loading corresponding pretightning force with the internal surface of bearing room is fixed.

2. The motor bearing preload loading structure as claimed in claim 1, wherein the notch is disposed on an inner end surface of the bearing chamber corresponding to the position of the outer race of the bearing.

3. The motor bearing preload loading structure as claimed in claim 2, wherein the notch is engaged with a pressure head of the bearing preload tool, and the pressure head of the bearing preload tool is pressed against an end face of the bearing outer ring through the notch.

4. The motor bearing preload force loading structure as claimed in claim 2, wherein said notch is formed by outwardly projecting and extending from an inner end surface of said bearing housing.

5. The motor bearing preload force loading structure as claimed in claim 4, wherein said notch is a square notch with three sides being right-angled sides.

6. The motor bearing preload force loading structure as claimed in claim 1, wherein the plurality of notches are circumferentially and uniformly distributed along the inner end surface of the bearing chamber.

7. The motor bearing preload force loading structure as claimed in claim 1, wherein said bearing outer race is adhesively secured to an inner surface of said bearing housing.

8. An electric machine, characterized in that the electric machine comprises the bearing preload loading structure of the electric machine as claimed in any one of claims 1 to 7.

9. The electric machine of claim 8, wherein the bracket comprises a lower bracket, the bearing chamber being disposed within the lower bracket.

10. The electric machine of claim 9, wherein the bracket further comprises an upper bracket, the upper and lower brackets being secured by screws.