JP2002078281A - Bearing fixing structure for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an abnormal sound of a bearing by increasing the quantity of grease to the bearings of a motor. SOLUTION: Grease pockets 6 for filling grease 7 are provided in a holding face of a housing 2a which holds ball bearings 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing mounting structure for a motor using a ball bearing.

[0002]

2. Description of the Related Art A conventional motor using a ball bearing will be described with reference to FIG. 3 using a molded motor molded with a molding resin as an example. FIG. 3 is a side sectional view of a conventional molded motor.

In FIG. 3, a mold frame 11 includes:
A tubular stator 14 is formed in a bowl shape by a mold resin 12 and has a winding 13 wound inside. A housing 11a for housing the bearing 15b is formed at the bottom.

[0004] The electric motor 16 comprises a mold frame 11 and
The rotor 1 housed inside the mold frame 11
7 and two ball bearings 15a and 15b for rotatably supporting the rotor 17 and a bearing bracket 18 provided with a housing 18a for accommodating one of the ball bearings 15a. The bearing bracket 18 is fixed to the mold frame 11.

[0005] Further, between the inner peripheral surface of the housing 11a for accommodating the ball bearing 15a formed on the mold frame 11 and the outer peripheral surface of the ball bearing 11b,
A gap of several μm is provided.

[0006] Grease 19 is applied to the gap,
The grease 19 prevents minute vibration occurring between the housing 11a and the ball bearing 11b, thereby preventing generation of abnormal noise.

[0007]

However, if the motor is used for a long time, the grease deteriorates or volatilizes and disappears, and a minute vibration occurs between the housing of the ball bearing and the ball bearing to generate abnormal noise. May be.

[0008]

Therefore, according to the present invention, a grease pocket for filling grease is provided on a housing surface of a housing for housing a ball bearing. I will provide a.

[0009]

[Function] By providing one or several grease pockets on the inner peripheral surface of the housing and filling the pockets with grease, the space between the ball bearing housing and the ball bearing is always filled with grease. , Vibration can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor according to the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of a molded motor according to the present invention. FIG. 2 is an enlarged front view of a ball bearing housing formed on the mold frame of FIG.

In FIG. 1, similarly to a conventional motor, a motor 1 includes a mold frame 2, a rotor 3 housed inside the mold frame 2, and two rotors 3 rotatably supporting the rotor 3. Ball bearings 4a, 4b
And a bearing bracket 5 having a housing 5a for accommodating one of the ball bearings 4a.

The bearing bracket 5 is fixed to the mold frame 2, and the other ball bearing 4 b is housed in a housing 2 a provided at the bottom of the mold frame 2. This ball bearing 4b
A gap is formed between the housing 2a in which is stored and the ball bearing 4b, and when the rotor 3 rotates, the ball bearing 4b rotates at an arbitrary rotation speed in proportion to the rotation.

In FIG. 1 and FIG. 2, one (or several) grease pockets 6 cut in a concave shape are provided on the inner peripheral surface of a housing 2a formed in a mold frame 2. The pocket 6 is filled with grease 7, and when the grease 7 between the housing 2a and the ball bearing 4b decreases,
The grease 7 in the pocket 6 is replenished.

The ball bearing 4b is connected to the rotor 3
, The grease 7 enters the gap D, and the grease 7 is constantly and uniformly applied to the outer periphery of the ball bearing.

[0015]

According to the present invention, by providing a grease pocket in the bearing storage portion, the amount of grease in the bearing portion of the electric motor can be increased, and abnormal noise of the bearing can be prevented.

[0016]

[Brief description of the drawings]

FIG. 1 is a side sectional view of a molded motor according to the present invention.

FIG. 2 is an enlarged front view of a housing of a ball bearing formed on the mold frame of FIG. 1;

FIG. 3 is a side sectional view of a conventional molded motor.

[Explanation of symbols]

 1, 16 ... Electric motor 2, 11 ... Mold frame 3, 17 ... Rotor 4a, 4b, 15a, 15b ... Ball bearing 5, 18 ... Bearing bracket 6 ... Grease pocket 7, 19 ... Grease 12 ... Mold resin 13 ... Winding 14 ... stator

Continued on the front page F term (reference) 5H604 AA05 BB01 BB10 BB14 CC01 CC05 CC16 DB02 5H605 AA05 BB05 CC04 EB10 EB16 EB23 EB31 EC13 GG18 5H615 AA01 BB01 BB07 PP12 PP25 SS19 SS44

Claims (1)

[Claims] 1. A motor bearing mounting structure using a ball bearing, wherein a grease pocket for filling grease is provided on a housing surface of a housing for housing the ball bearing. Construction.