JPH09191602A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent idling between the outside diameter of a bearing and the inside diameter of a resin housing without requiring any bonding process by providing a protrusion or recess axially in the inside diameter of housing for fitting a bearing and a recess or protrusion axially in the outer ring of bearing. SOLUTION: At the time of molding, a resin housing 10a is provided a protrusion 11 in the axial direction and a recess 12, to be fitted with the protrusion 11, is made previously in the outer ring of a ball bearing 7a in the axial direction. A rotator, including a rotor, a shaft 6 and an E ring 9, is then inserted into the resin housing 10a through the ball bearing 7a while fitting the protrusion 11 and recess 12 thus blocking the idling of outer ring of ball bearing 7a and preventing the creep phenomenon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor using a ball bearing used for air conditioners and the like.

[0002]

2. Description of the Related Art A rotor is inserted through a stator core around which a stator winding is wound, and a housing for housing a bearing and a frame for supporting the rotor around the stator winding and the stator core are covered with resin or the like. The electric motors are used for ventilation of air conditioners. The structural sectional view is shown in FIG. Further, an enlarged view of the resin housing portion 10 and the ball bearing 7 is shown in FIG.

In FIG. 2, a rotor 3, a shaft 6 and an E ring 9 are shown.
In order to support the rotating body such as the ball bearing 7 through the ball bearing 7, it is preferable to provide the resin housing portion 10 on a part of the stator core 1, the winding 2 and the like which is covered with the resin 4 to support the rotating body. Be taken. At this time, since the inner diameter accuracy of the resin housing portion 10 is worse than the inner diameter accuracy of the iron plate housing or the casting housing, the outer ring of the ball bearing 7 idles in the direction of the arrow in FIG. 3, resulting in the creep phenomenon. It becomes defective. As a countermeasure, the outer diameter of the ball bearing 7 and the resin housing 1
An adhesive material is applied to the minute clearance b portion with the inner diameter of 0 to fix it, and the occurrence of the creep phenomenon is stopped.

[0004]

However, in the prior art, the step of adhering the outer diameter of the ball bearing 7 and the inner diameter of the resin housing portion 10 is required, and further the adhesive is applied inside the ball bearing 7. There is a problem in that a defect that the inner ring and the outer ring of the ball bearing 7 are stuck to each other and stick to each other occurs.

[0005]

SUMMARY OF THE INVENTION The present invention is provided with an axial convex portion or a concave portion on an inner diameter of a bearing fitting housing of an electric motor and an axial concave portion or a convex portion on an outer ring of the bearing.

[0006]

The invention according to claim 1 of the present invention is such that the rotor is inserted through a stator core around which a stator winding is wound, and the rotor is provided around the stator winding and the stator core. In an electric motor in which the bearing fitting housing and frame that support the bearing are covered with resin, etc., the bearing fitting housing inner diameter has an axial convex part and the bearing outer ring an axial concave part, or the reverse combination of the bearing fitting housing inner diameter. One or more sets of an axial concave portion and an axial convex portion are provided on the outer ring of the bearing, and a rotation stopper between the outer shape of the ball bearing and the inner diameter of the resin housing is provided by the uneven fitting portion. Has the effect of.

A mode of one embodiment of the present invention will be described below.
This will be described with reference to the drawings. An enlarged view of the resin housing portion and the ball bearing of the present invention is shown in FIG. In FIG. 1, in order to support the rotating body such as the rotor 3, the shaft 6, and the E ring 9 via the ball bearing 7a, the stator core 1, the winding 2 and the like are made of resin 4.
The method is the same as the conventional example up to the method of supporting the rotating body by providing the resin housing portion 10a on a part of the exterior.

As a countermeasure against the occurrence of the creep phenomenon as a result of the outer ring of the ball bearing 7a idling, the resin housing portion 10
A convex portion 11 in the axial direction is provided on a at the time of molding the resin housing portion 10a. Further, the concave portion 1 having a shape that meshes with the convex portion 11
2 is provided in advance in the axial direction of the outer ring of the ball bearing 7a.
Next, when inserting the rotor 3, the shaft 6, the rotating body such as the E ring 9 into the resin housing portion 10a via the ball bearing 7a,
It is completed by inserting the convex portion 11 and the concave portion 12 together. No gluing is required here.

Here, the convex portion 11 and the concave portion 12 may have opposite shapes such as a concave portion and a convex portion, respectively. Further, there may be a plurality of sets of these convex portions and concave portions.

[0010]

According to the present invention, even if the outer ring of the ball bearing 7a acts to move in the radial direction, the convex portion 11 and the concave portion 12 are formed.
, The outer ring of the ball bearing 7a does not idle and the creep phenomenon does not occur.

Compared with the conventional example, the step of bonding the outer diameter of the ball bearing 7a and the resin housing portion 10a is not required,
Further, the adhesive enters the inside of the ball bearing 7a to penetrate the ball bearing 7a.
The effect of fixing the inner ring and the outer ring to each other is also eliminated, and the effect is extremely large.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a resin housing portion and a ball bearing according to an embodiment of the present invention.

FIG. 2 is a structural cross-sectional view of a conventional example and an electric motor of the present invention.

FIG. 3 is an enlarged view of a conventional resin housing part and a ball bearing.

[Explanation of symbols]

 1 Stator iron core 2 Winding 3 Rotor 4 Resin 5 Bracket 6 Shaft 7, 7a Ball bearing 8 Wave washer 9 E-ring 10, 10a Resin housing part 11 Convex part 12 Concave part b Small clearance

Claims (1)

[Claims] 1. A housing for fitting a bearing and a frame for supporting a rotor on the outer periphery of the stator winding and the stator core, the rotor being inserted through a stator core around which the stator winding is wound, and the frame being covered with resin or the like. In this motor, the inner diameter of the bearing fitting housing is provided with an axial convex portion and the bearing outer ring is provided with an axial concave portion. An electric motor characterized by having one or more sets.