JPH0956114A - Bearing structure for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bearing structure for a motor in which vibration-proof and sound-proof performance of metal bearing is enhanced. SOLUTION: The bearing structure for a motor comprises a bracket 3 having a central through hole 3a penetrating a rotary shaft 28 with a bearing holding part 3a1 being defined in the center by an annular recess 3a2, a substantially disc-like thrust receiving plate 8 abutting against the end face of the rotary shaft, a metal bearing 6, a metal retainer 5 serving as a preload spring, and a substantially tubular bottomed metal cover 4 containing an oil pad 4b. A substantially annular resilient member 9a is interposed between the metal cover and metal retainer and a substantially disc-like metal receiving plate 7 having a cup-shaped recess 7a and a central through hole for inserting the thrust receiving plate is provided. A corresponding resilient member 9b is disposed at the lower part of metal receiving plate and a metal bearing is clamped at the bearing holding part through the resilient member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure for an electric motor, and more particularly to a noise and vibration preventing structure for a metal bearing.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an annular recess 3a2 is formed in the center of which a through hole 3a for inserting a rotary shaft 2a is formed.
Bracket 3 in which the bearing holding portion 3a1 is formed in the center by
A thrust elastic member 10, a substantially disk-shaped thrust receiving plate 8 that contacts the end surface of the rotating shaft, and a metal bearing 6.
And a metal retainer 5 serving as a preload spring, and a substantially bottomed tubular metal cover 4 having an oil pad 4b therein. Then, the metal cover tubular portion 4c is superposed on the bracket in this order, and the metal cover tubular portion 4c is fitted to the outer periphery thereof from the inside of the recess to form the bearing structure of the electric motor shown in FIG.

As shown in FIG. 4, in the bearing structure of this electric motor, in order to prevent the rotating shaft 2a from coming into contact with the bracket 3, a thrust receiving plate 7 provided below the metal bearing 6 and the bracket are provided. The elastic member 10 is inserted between them. However, the elastic member is not inserted in a portion where the rotary shaft comes into contact with the bracket through the metal bearing, and thus vibration and soundproofing properties are insufficient. In this case, there is a problem that the vibration of the bearing structure of the electric motor is easily transmitted to the outside.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and prevents vibration and noise transmitted to a bracket through a metal bearing of a bearing structure of an electric motor to prevent vibration and noise. An object of the present invention is to provide a bearing structure for an electric motor with improved soundproofing.

[0005]

To achieve the above object, a bracket having a through hole through which a rotary shaft is inserted is formed in the center, and a bearing holding portion is formed in the center by an annular recess, and a thrust elastic member, A substantially circular plate-shaped thrust receiving plate that contacts the end surface of the rotating shaft, a metal bearing, a metal retainer that serves as a preload spring, and a substantially bottomed tubular metal cover having an oil pad inside, In a bearing structure of an electric motor which is superposed on the bracket in this order and fitted with the metal cover tubular portion from the inside of the recess to the outer periphery thereof, a substantially annular elastic member is provided between the metal cover and the metal retainer. Under the metal bearing, a member is formed in the center with a bowl-shaped recess corresponding to the metal bearing and a through hole for inserting the thrust receiving plate, and a substantially circular shape having an outer diameter substantially the same as the inner circumference of the cylindrical portion. Plate-shaped A metal receiving plate and elastic members corresponding to the lower part of the metal receiving plate, respectively, and the metal bearing is sandwiched between the metal cover and the bearing holding portion of the bracket through the elastic member. It is characterized by being done.

The material of the elastic member is rubber. Further, the material of the metal receiving plate is a steel plate.

Further, the metal receiving plate and the elastic member are integrally formed.

Alternatively, the metal retainer and the elastic member are integrally formed.

[0009]

According to the above construction, the through hole for inserting the rotary shaft is formed in the center, the bracket having the bearing holding portion formed in the center by the annular recess, the thrust elastic member, and the end face of the rotary shaft are abutted. A substantially circular disk-shaped thrust receiving plate to be contacted, a metal bearing, a metal retainer to be a preload spring, and a substantially bottomed cylindrical metal cover having an oil pad inside are provided on the bracket in this order. In a bearing structure of an electric motor, which is formed by stacking and fitting the metal cover tubular portion from the inside of the recess to the outer periphery thereof, a substantially annular elastic member is provided between the metal cover and the metal retainer. Below, a bowl-shaped recess corresponding to the same metal bearing and a through hole for inserting the thrust receiving plate are formed in the center,
A substantially disk-shaped metal receiving plate having an outer diameter substantially the same as the inner circumference of the cylindrical portion, and elastic members corresponding to the lower portion of the metal receiving plate are disposed below the metal receiving plate, and the metal is interposed via the elastic member. The bearing is sandwiched between the metal cover and the bearing holding portion of the bracket.

The elastic member is made of rubber, the metal receiving plate is made of steel plate, and the metal receiving plate and the elastic member are integrally formed. Alternatively, or because the metal retainer and the elastic member are integrally formed, vibration and noise of the motor bearing structure are transmitted to the outside through the metal bearing of the motor bearing structure. It can be suppressed from being transmitted.

[0011]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same parts as in the related art. FIG. 1 is a sectional view of an embodiment of a bearing structure for an electric motor according to the present invention. Further, FIG. 2 is an enlarged cross-sectional view of a main part of a bearing structure for an electric motor according to the present invention, and FIG. 3 is an exploded perspective view.

In the bearing structure of the electric motor according to the present invention, the through hole 3a for inserting the rotary shaft 2a is formed in the center, and the bracket 3 in which the bearing holding portion 3a1 is formed in the center by the annular recess 3a2, the thrust elastic member 10 and , A substantially disk-shaped thrust receiving plate 8 abutting against the end face of the rotating shaft, a metal bearing 6, a metal retainer 5 serving as a preload spring, and a substantially bottomed cylindrical metal having an oil pad 4b therein. And a cover 4.

Then, the bearing structure of the electric motor is constructed by stacking the metal cover tubular portion 4c on the bracket in this order and fitting the metal cover tubular portion 4c from the inside of the recess to the outer periphery thereof. In addition, 1 is a stator core and 2 is a rotor. Here, a substantially annular elastic member 9a is arranged below the metal bearing between the metal cover and the metal retainer.

A bowl-shaped recess 7a corresponding to the same metal bearing and a through hole 7b into which the thrust receiving plate is inserted are formed in the center, and a substantially disk-shaped metal receiving member having an outer diameter substantially the same as the inner circumference of the cylindrical portion is formed. A plate 7 is provided. An elastic member 9b corresponding to the lower part of the metal receiving plate is arranged below it. The elastic member 9b
In addition, the thrust elastic member 10 may be integrated as in this embodiment.

The metal bearing is sandwiched between the metal cover and the bearing holding portion of the bracket through the elastic member. The elastic member is made of rubber. The material of the metal receiving plate is a steel plate.

Further, the metal receiving plate and the elastic member may be integrally formed. Alternatively,
The metal retainer and the elastic member may be integrally formed.

[0017]

As described above, in the present invention, the through hole for inserting the rotary shaft is formed in the center, and the bracket having the bearing holding portion formed in the center by the annular recess, the thrust elastic member, and the rotary shaft. A substantially circular disk-shaped thrust receiving plate, a metal bearing, a metal retainer that serves as a preload spring, and a substantially bottomed cylindrical metal cover having an oil pad inside. In a bearing structure of an electric motor which is superposed on a bracket and in which the metal cover tubular portion is fitted to the outer periphery from the inside of the recess, a substantially annular elastic member is provided between the metal cover and the metal retainer. Under the metal bearing, a bowl-shaped recess corresponding to the metal bearing and a through hole into which the thrust receiving plate is inserted are formed in the center, and a substantially disc-like shape having an outer diameter substantially the same as the inner circumference of the tubular portion is formed. Metal backing plate , And elastic members corresponding to the lower part of the metal receiving plate are disposed below the metal receiving plate, and the metal bearing is sandwiched between the metal cover and the bearing holding portion of the bracket via the elastic member. I chose

The elastic member is made of rubber, the metal receiving plate is made of steel plate, and the metal receiving plate and the elastic member are integrally formed. Or, since the metal retainer and the elastic member are integrally formed, vibration and noise transmitted to the bracket are prevented through the metal bearing of the bearing structure of the electric motor, It is possible to provide a bearing structure for an electric motor with improved vibration damping and soundproofing.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a bearing structure for an electric motor according to the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing an embodiment of a bearing structure for an electric motor according to the present invention.

FIG. 3 is an exploded perspective view showing an embodiment of a bearing structure for an electric motor according to the present invention.

FIG. 4 is an enlarged sectional view of an essential part showing an example of a bearing structure of a conventional electric motor.

FIG. 5 is an exploded perspective view showing an example of a conventional bearing structure of an electric motor.

FIG. 6 is a sectional view showing an example of a conventional bearing structure of an electric motor.

[Explanation of symbols]

 1 Stator core 2 Rotor 2a Rotating shaft 3 Bracket 3a Through hole 3a1 Bearing holding part 3a2 Recess 4 Metal cover 4b Oil pad 4c Cylindrical part 5 Metal retainer 6 Metal bearing 7 Metal receiving plate 7a Bowl-shaped recess 7b Through hole 8 Thrust receiving Plate 9a Elastic member 9b Elastic member 10 Thrust elastic member

Claims (5)

[Claims] 1. A bracket having a through hole for inserting a rotary shaft formed at the center and a bearing holding portion formed at the center by an annular recess, a thrust elastic member, and a substantially circular shape abutting against an end face of the rotary shaft. A plate-shaped thrust receiving plate, a metal bearing, a metal retainer that serves as a preload spring, and a substantially bottomed tubular metal cover having an oil pad inside, are stacked in this order on the bracket, In a bearing structure of an electric motor configured by fitting a cover tubular portion from the inside of the recess to the outer periphery thereof, a substantially annular elastic member is provided between the metal cover and the metal retainer, and a metal ring is provided under the metal bearing. A bowl-shaped recess corresponding to the bearing and a through hole into which the thrust receiving plate is inserted are formed in the center, and a substantially disk-shaped metal receiving plate having an outer diameter substantially the same as the inner circumference of the cylindrical portion is provided under the same. Under the metal backing plate A bearing structure for an electric motor, characterized in that elastic members corresponding to the respective parts are respectively arranged, and the metal bearing is sandwiched between the metal cover and the bearing holding portion of the bracket via the elastic member. 2. The bearing structure for an electric motor according to claim 1, wherein the material of the elastic member is rubber. 3. The bearing structure for an electric motor according to claim 1, wherein the material of the metal receiving plate is a steel plate. 4. The metal receiving plate and the elastic member,
The bearing structure for an electric motor according to claim 1, wherein the bearing structure is integrally formed. 5. The bearing structure for an electric motor according to claim 1, wherein the metal retainer and the elastic member are integrally formed.