CN210499684U

CN210499684U - Electric tool

Info

Publication number: CN210499684U
Application number: CN201921389373.7U
Authority: CN
Inventors: 吴威
Original assignee: Jiangsu Dongcheng M&e Tools Co ltd
Current assignee: Jiangsu Dongcheng M&e Tools Co ltd
Priority date: 2019-08-24
Filing date: 2019-08-24
Publication date: 2020-05-12
Anticipated expiration: 2029-08-24

Abstract

A power tool, comprising: casing, install motor in the casing, by motor drive's output shaft and the bearing assembly who supports the output shaft, bearing assembly includes: the bearing seat is formed by enclosing a first end face and a second end face and the bearing is arranged in the bearing seat, the bearing comprises a bearing outer ring abutted against the first end face, the bearing assembly comprises a wave washer and a first middle layer, the wave washer and the first middle layer are positioned between the second end face and the bearing outer ring, the first middle layer is positioned between the wave washer and the bearing outer ring, the wave washer is abutted against the second end face, the bearing outer ring is in compression joint with one side of the first middle layer, and the wave washer is abutted against the other side of the first middle layer. The utility model discloses a set up wave washer and first intermediate level between the second terminal surface of bearing frame and bearing inner race, utilize wave washer's elasticity for first intermediate level tightly supports and leans on in the bearing inner race, frictional force between the first intermediate level of greatly increased and the bearing inner race, and simple structure prevents that the bearing from running the outer lane.

Description

Electric tool

[ technical field ]

The utility model relates to an electric tool, in particular to an electric tool for decoration and building occasions.

[ background art ]

An electric tool is a power machine driven by a motor, and plays an increasingly important role in the industries of construction, decoration and the like. When the electric tool is driven by the motor, the bearing is needed to assist and cooperate, and the bearing is used for supporting the output shaft of the motor so as to reduce the motion friction and improve the rotation precision. In the electric tool in the prior art, the bearing comprises a bearing inner ring and a bearing outer ring, when the motor is driven, the bearing inner ring and the motor output shaft are fixed and synchronously rotate, and the bearing outer ring is fixed and fixed. However, in actual operation, the bearing outer ring also rotates due to a fitting tolerance or machining accuracy, and this phenomenon is called "outer ring running". The bearing outer race has great influence on the machine, so that the abrasion of parts is aggravated, and the precision of the machine is reduced; in addition, a large amount of energy is converted into useless heat energy and noise, and the working efficiency of the motor is reduced.

In order to solve the bearing outer ring running phenomenon, a wave washer is added between the bearing and the bearing chamber, and the wave washer and the bearing outer ring generate friction force to prevent the bearing from running the outer ring. However, the outer ring of the bearing may occasionally rotate due to insufficient friction. Please refer to chinese utility model patent No. 201220155163.3, which was announced in 2012, 10, 31, and discloses a novel motor including a rotor, a stator, a rotating shaft and a commutator, wherein the rotating shaft is sleeved with a front and a rear bracket and a front and a rear bearing, the commutator is located between the rotor and the rear bearing, a wave-shaped gasket is arranged between the commutator and the rear bearing, red paper gaskets are arranged between the wave-shaped gasket and the commutator, the rear bearing, and the red paper gaskets are sleeved on the rotating shaft. Because the red light paper is more wear-resisting, so whole motor is durable in use, but this structure still does not solve the bearing and runs the easy wearing and tearing of part, short service life and the motor work efficiency low problem that the outer lane brought.

Accordingly, there is a need for an improved power tool that overcomes the deficiencies of the prior art.

[ contents of utility model ]

To the not enough of prior art, the utility model aims to provide an electric tool that long service life and work efficiency are high.

The utility model provides a prior art problem can adopt following technical scheme: a power tool, comprising: a housing, a motor mounted within the housing, an output shaft driven by the motor, and a bearing assembly supporting the output shaft, the bearing assembly comprising: the bearing comprises a bearing seat and a bearing, wherein the bearing seat is formed by a first end face and a second end face in a surrounding mode, the bearing is arranged in the bearing seat, the bearing comprises a bearing outer ring abutted against the first end face, the bearing assembly comprises a wave washer and a first middle layer, the wave washer and the first middle layer are located between the second end face and the bearing outer ring, the first middle layer is located between the wave washer and the bearing outer ring, the wave washer is abutted against the second end face, the bearing outer ring is in compression joint with one side of the first middle layer, and the wave washer is abutted against the other side of the first middle layer.

The further improvement scheme is as follows: the first middle layer is a plastic body integrally formed on the wave washer, and the first middle layer covers the surface of the wave washer.

The further improvement scheme is as follows: the plastic body in first intermediate level divide into a plurality of independent plastic piece, plastic piece interval distribution in the peripheral surface of wave washer.

The further improvement scheme is as follows: the bearing assembly also includes a second intermediate layer between the wave washer and the second end face, the second intermediate layer having one side abutting the wave washer and another side abutting the second end face.

The further improvement scheme is as follows: the friction coefficients of the materials of the first intermediate layer and the second intermediate layer are both larger than the friction coefficient of the material of the wave washer.

The further improvement scheme is as follows: the wave washer is made of a steel material, and the first intermediate layer and the second intermediate layer are made of a rubber material.

The further improvement scheme is as follows: the first middle layer and the second middle layer are integrally formed plastic bodies, and the plastic bodies wrap the outer surface of the wave washer.

The further improvement scheme is as follows: the plastic body is divided into a plurality of independent plastic blocks, and the plastic blocks are distributed on the periphery of the wave washer at intervals.

The further improvement scheme is as follows: the bearing comprises a bearing inner ring for supporting the output shaft, the bearing outer ring is fixed relative to the bearing seat, and the bearing inner ring is driven by the output shaft to rotate relative to the bearing seat.

The further improvement scheme is as follows: the electric tool comprises a fan blade positioned between the bearing assembly and the motor, the fan blade is arranged on the output shaft, and the bearing inner ring is abutted against the fan blade.

Compared with the prior art, the utility model discloses following beneficial effect has: the wave washer and the first intermediate layer are arranged between the second end face of the bearing seat and the bearing outer ring, and the first intermediate layer is tightly abutted against the bearing outer ring by utilizing the elasticity of the wave washer, so that the friction force between the first intermediate layer and the bearing outer ring is greatly increased, the structure is simple, and the bearing is prevented from running out of the outer ring; a second intermediate layer is arranged between the second end surface of the bearing seat and the wave washer, so that the friction force between the bearing seat and the wave washer is ensured, and the bearing is effectively prevented from running out of the outer ring; meanwhile, the friction coefficient of the material of the middle layer is set to be larger than that of the material of the wave washer, so that the friction force between the middle layer and the bearing seat and between the middle layer and the outer ring of the bearing is increased, and the bearing is further prevented from running out of the outer ring.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a schematic view of a first embodiment of an electric tool according to the present invention;

FIG. 2 is an enlarged partial view of circle A of the power tool of FIG. 1;

FIG. 3 is a schematic view of a power tool according to another embodiment of the present invention;

FIG. 4 is an enlarged partial view of circle B of the power tool of FIG. 2;

fig. 5 is a schematic view of a preferred construction of the gasket and intermediate layer of the alternate embodiment of fig. 3.

The meaning of the reference symbols in the figures:

200. electric tool 100, bearing assembly 101, shell 102, motor 103, output shaft 104, fan blade 105, work head 1, bearing seat 11, first end face 12, second end face 2, bearing 21, bearing outer ring 22, bearing inner ring 3, wave washer 4, first intermediate layer 5, second intermediate layer 5

[ detailed description of the invention ]

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, the electric tool 200 according to the first embodiment of the present disclosure includes a housing 101, a motor 102 installed in the housing 101, an output shaft 103 driven by the motor 102, a bearing assembly 100 supporting the output shaft 103, and a blade 104 and a working head 105 fixedly connected to the output shaft 103. The fan blade 104 is located between the bearing assembly 100 and the motor 102, the output shaft 103 protrudes outside the housing 101, and the working head 105 is mounted at the end of the output shaft 103 protruding from the housing 101. When the electric tool 200 works, a power supply is switched on, the motor 102 is started, the motor 102 drives the output shaft 103 to rotate, and drives the fan blade 104 and the working head 105 to rotate so as to perform grinding and polishing operations, wherein the fan blade 104 is used for dissipating heat of the electric tool 200.

Referring to fig. 3, the bearing assembly 100 includes: the bearing seat comprises a bearing seat 1 formed by enclosing a first end face 11 and a second end face 12, a bearing 2 arranged in the bearing seat 1, and a wave washer 3 and a first intermediate layer 4 which are positioned between the bearing seat 1 and the bearing 2. The bearing 2 comprises a bearing outer ring 21 abutting against the first end face 11 and a bearing inner ring 22 supporting the output shaft 103, one end of the bearing inner ring 22 abuts against the fan blade 104, and the other end of the bearing inner ring 22 is not in contact with the wave washer 3 and the first intermediate layer 4. When the power tool 200 is operated, the bearing outer race 21 is fixed with respect to the bearing housing 1, and the bearing inner race 22 is rotated with respect to the bearing housing 1 by the output shaft 103. The wave washer 3 and the first intermediate layer 4 are located between the second end face 12 of the bearing seat 1 and the bearing outer ring 21 of the bearing 2, specifically, the first intermediate layer 4 is located between the wave washer 3 and the bearing outer ring 21, the wave washer 3 abuts against the second end face 12, the bearing outer ring 21 is in crimping connection with one end of the first intermediate layer 4, and the wave washer 3 abuts against the other end of the first intermediate layer 4. Through set up wave washer 3 and first intermediate level 4 between second terminal surface 12 and the bearing inner race 21 at bearing frame 1, utilize wave washer 3's elasticity for first intermediate level 4 tightly supports and leans on in bearing inner race 21, frictional force between the first intermediate level 4 of greatly increased and the bearing inner race 21, simple structure prevents that the bearing from running the outer lane.

In the present embodiment, the first intermediate layer 4 is a plastic body integrally formed on the wave washer 3, and the first intermediate layer 4 covers the surface of the wave washer 3. Preferably, the plastic body of the first intermediate layer 4 is divided into a plurality of independent plastic blocks, and the plastic blocks are distributed on the peripheral surface of the wave washer 3 at intervals.

Referring to fig. 2 and 4, in another embodiment of the present invention, the bearing assembly 100 'includes a second intermediate layer 5' between the wave washer 3 'and the second end surface 12', one side of the second intermediate layer 5 'abuts against the wave washer 3', and the other side abuts against the second end surface 12 'of the bearing seat 1'. By providing the second intermediate layer 5 'between the second end face 12' of the bearing seat 1 'and the wave washer 3', the friction between the bearing seat 1 'and the wave washer 3' is ensured, effectively preventing the bearing from running out of the outer ring.

In the present embodiment, the first intermediate layer 4 ' and the second intermediate layer 5 ' are integrally formed plastic bodies, and the plastic bodies are wrapped around the outer surface of the wave washer 3 '. Referring to fig. 5, preferably, the plastic body is divided into a plurality of independent plastic blocks, and the plastic blocks are spaced around the periphery of the wave washer 3'.

In the present invention, the friction coefficient of the material of the first intermediate layer 4 ' and the second intermediate layer 5 ' is greater than the friction coefficient of the material of the wave washer 3 '. Preferably, the wave washer 3 ' is made of a steel material and the first intermediate layer 4 ' and the second intermediate layer 5 ' are made of a rubber material. The friction coefficient of the material of the middle layer is set to be larger than that of the material of the wave washer 3 ', so that the friction force between the middle layer and the bearing seat 1 ' and between the middle layer and the bearing outer ring 21 ' is increased, and the bearing is further prevented from running out of the outer ring.

The utility model discloses a set up wave washer 3 and first intermediate level between second terminal surface 12 of bearing frame 1 and bearing inner race 21, utilize wave washer 3's elasticity for first intermediate level 4 tightly supports and leans on in bearing inner race 21, frictional force between the first intermediate level 4 of greatly increased and the bearing inner race 21, and simple structure prevents that the bearing from running the outer lane. A second intermediate layer is arranged between the second end face 12 of the bearing seat 1 and the wave washer 3, so that the friction force between the bearing seat 1 and the wave washer 3 is ensured, and the bearing is effectively prevented from running out of the outer ring. Meanwhile, the friction coefficient of the material of the middle layer is set to be larger than that of the material of the wave washer 3, so that the friction force between the middle layer and the bearing seat 1 and between the middle layer and the bearing outer ring 21 is increased, and the bearing is further prevented from running out of the outer ring.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many other alternatives to the power tool may be made without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. A power tool, comprising: a housing, a motor mounted within the housing, an output shaft driven by the motor, and a bearing assembly supporting the output shaft, the bearing assembly comprising: the bearing frame that is put by first terminal surface and second terminal surface are enclosed and settle the bearing in the bearing frame, the bearing includes to support by the bearing inner race that leans on in the first terminal surface, its characterized in that: the bearing assembly comprises a wave washer and a first middle layer, wherein the wave washer and the first middle layer are located between the second end face and the bearing outer ring, the first middle layer is located between the wave washer and the bearing outer ring, the wave washer abuts against the second end face, the bearing outer ring is in compression joint with one side of the first middle layer, and the wave washer abuts against the other side of the first middle layer.

2. The power tool of claim 1, wherein: the first middle layer is a plastic body integrally formed on the wave washer, and the first middle layer covers the surface of the wave washer.

3. The power tool of claim 2, wherein: the plastic body in first intermediate level divide into a plurality of independent plastic piece, plastic piece interval distribution in the peripheral surface of wave washer.

4. The power tool of claim 1, wherein: the bearing assembly also includes a second intermediate layer between the wave washer and the second end face, the second intermediate layer having one side abutting the wave washer and another side abutting the second end face.

5. The power tool of claim 4, wherein: the friction coefficients of the materials of the first intermediate layer and the second intermediate layer are both larger than the friction coefficient of the material of the wave washer.

6. The power tool of claim 5, wherein: the wave washer is made of a steel material, and the first intermediate layer and the second intermediate layer are made of a rubber material.

7. The power tool of claim 4, wherein: the first middle layer and the second middle layer are integrally formed plastic bodies, and the plastic bodies wrap the outer surface of the wave washer.

8. The power tool of claim 7, wherein: the plastic body is divided into a plurality of independent plastic blocks, and the plastic blocks are distributed on the periphery of the wave washer at intervals.

9. The power tool of claim 1, wherein: the bearing comprises a bearing inner ring for supporting the output shaft, the bearing outer ring is fixed relative to the bearing seat, and the bearing inner ring is driven by the output shaft to rotate relative to the bearing seat.

10. The power tool of claim 9, wherein: the electric tool comprises a fan blade positioned between the bearing assembly and the motor, the fan blade is arranged on the output shaft, and the bearing inner ring is abutted against the fan blade.