JP2551374B2 - Electric motor assembly method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling an electric motor composed of a rotor and a stator.

[0002]

2. Description of the Related Art Conventionally, when assembling an electric motor having a structure in which a rotating shaft of a rotor is supported by a stator through a pair of bearings, the rotor is placed on a workbench with the rotating shaft facing vertically upward. The so-called vertical assembly method, in which the stator is assembled from above, is often used.

FIG. 2 shows a method of vertically assembling an electric motor. In this example, a stator frame 2 having a cylindrical boss portion 2a having a through hole 1 in the center thereof, and a tip outer periphery of the boss portion 2a are provided. The stator 4 is fixed to the annular laminated core 3
And a yoke 5 formed in a bowl shape and its peripheral wall portion 5
a permanent magnet 6 fixed to the inner periphery of a and the bottom wall portion 5 of the yoke 5
The rotor 7 is constituted by the rotating shaft 9 attached at the center of b. Both ends of the through hole 1 at the center of the boss portion 2a of the stator are bearing support hole portions 1A and 1B having a larger diameter than the other portions of the through hole, and inside the bearing support hole portions 1A and 1B. A pair of bearings 8 and 10 are fitted in the gap, and the rotating shaft 9 of the rotor is connected to the stator 4 via both bearings.
It is supposed to be supported by.

When assembling the electric motor, the rotor 7 is arranged with the rotary shaft 9 oriented vertically upward, the bearing 10 is supported on the base of the rotary shaft of the rotor, and the boss portion 2a is provided above the rotor. The bearing 8 is supported in the bearing support hole portion 1A on the upper side of the stator 4 which is arranged with its tip facing downward. In this state, a step of inserting the rotating shaft 9 into the through hole 1 of the boss portion 2a and fitting the tip of the rotating shaft 9 into the inside of the bearing 8 is performed, and the rotating shaft 9 is inserted through the bearings 8 and 10 into the stator. Assemble the electric motor supported by 4.

However, in such an assembling method, since both bearings 8 and 10 are separately assembled to the boss portion 2a and the rotary shaft 9, the assembling of the bearings 8 and 10 must be performed in a separate process, which is troublesome. However, there was a problem that the assembly work was troublesome due to the trouble. In order to improve this, as shown in FIG. 3, a method has been proposed in which the bearing 10, which will be located below during assembly, is also supported in advance in the bearing support hole 1B below the boss portion 2a. , In this case,
In order to prevent the lower bearing 10 from falling off the boss portion 2a during assembly, it is necessary to caulk the tip of the boss portion 2a to form the inward projecting portion 2A.

As shown in FIG. 3, 1 for supporting the rotating shaft
If the pair of bearings 8 and 10 are attached to the boss portion 2a in advance, both bearings 8 and 10 can be assembled in the same step, which is an advantage that no labor is required.

[0007]

However, when the vertical assembly method as shown in FIG. 3 is adopted, a troublesome caulking step must be added to prevent the lower bearing 10 from falling. was there.

An object of the present invention is to provide a method of assembling an electric motor, which enables both the bearings to be supported by a stator without performing a troublesome caulking process, thereby facilitating the assembling of the electric motor. To do.

[0009]

As shown in FIG. 1 showing an embodiment of the present invention, a bearing support hole portion having both ends of an inner through hole larger in diameter than other portions of the through hole. 1A,
1B, a stator frame 2 having a tubular boss portion 2a, and a laminated core 3 fixed to the outer periphery of the tip portion of the boss portion 2a in a state of protruding partially from the tip of the boss portion 2a.
And bearing supporting hole portions 1A and 1 at both ends of the through hole of the boss portion.
A stator 4 provided with a pair of bearings 8 and 10 each fitted in a space in B, and a rotor 7 having a rotating shaft 9 protruding from the center of a bowl-shaped yoke 5 having a magnet attached to the inner circumference thereof are prepared. The rotor 7 with the rotary shaft 9 facing vertically upward.
And a pair of bearings 8 and 1 with the tip of the boss portion 2a of the stator 4 arranged above the rotor 7 facing downward.
The present invention relates to a method of assembling an electric motor in which an electric motor in which the rotating shaft 9 is supported by the stator 4 via a pair of bearings 8 and 10 is assembled by performing a step of fitting the rotating shaft 9 inside 0.

In the present invention, the boss portion 2 of the stator 4 is
On the inner peripheral portion of the laminated core 3 protruding from the tip of a, a stopper portion 12 protruding inward in the radial direction is formed by a core piece 11 that constitutes the laminated core, and by the stopper portion 12,
The pair of bearings 8 and 10 is prevented while preventing the bearing 10 fitted in the bearing support hole portion on the tip end side of the boss portion 2a from falling off.
The step of fitting the rotary shaft 9 inside is performed.

[0011]

With the above arrangement, with the pair of bearings 8 and 10 both supported by the boss portion 2a of the stator, the bearing 10 located on the lower side falls off from the bearing support hole portion 1B of the boss portion 2a. The vertical assembly method prevents the stator 4
Since the rotor and the rotor 7 can be assembled with each other, the stator and the rotor can be compared with the case where the process of mounting the bearing separately on the rotary shaft 9 and the boss portion 2a and fitting the rotary shaft and the bearing is performed. The assembly work of can be facilitated.

Further, since the stopper portion 12 provided on the inner peripheral portion of the laminated core can be easily formed when punching out the core piece constituting the laminated core, as shown in FIG. 3, the tip of the boss portion 2a is caulked. Compared with the case, the number of assembling steps can be reduced and the manufacturing cost can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG.

The electric motor assembled in this embodiment is the same as that shown in FIGS. 2 and 3, and the stator 4 is
A stator frame 2 having a boss portion 2a having a through hole 1 in the center thereof, and a laminated core 3 fixed to the tip of the boss portion 2a in a state in which a part of the boss portion 2a protrudes from the tip of the boss portion.
And bearings 8 and 10 which are fitted in the bearing support hole portions 1A and 1B formed at both ends of the through hole of the boss portion 2a. The rotor 7 includes a bowl-shaped yoke 5, a magnet 6 fixed to the inner circumference of the yoke 5, and a bottom wall portion 5 of the yoke 5.
and a rotating shaft 9 fixed to the center of b.

In the case of the assembling method of the present invention, the stopper portion 12 is provided on the inner peripheral portion of the portion of the laminated core 3 protruding from the tip of the boss portion 2a. The stopper portion 12 is formed by projecting the inner peripheral portion of the core piece 11 forming the laminated core inward in the radial direction, and the stopper portion 12 allows the bearing to be positioned on the lower side during assembly. 10 is prevented from falling out of the bearing support hole portion 1B.

The stopper portion 12 may be formed by making the inner diameter of the core piece 11 smaller than the others, or by forming a part of the inner peripheral edge of the core piece 11 so as to project inward. Good. In any case, the stopper portion 12 can be easily formed when punching out the core piece 11.

When assembling the electric motor, the rotor 7 is
The stator 4 having the rotating shaft 9 oriented vertically upward and supporting the bearings 8 and 10 in the bearing support hole portions 1A and 1B inside the boss portion 2a is provided in the boss portion 2a.
Is placed above the rotor 7 with its tip facing downward. In this state, the lower bearing 1 is stopped by the stopper portion 12.
The step of fitting the rotating shaft of the rotor into the inside of the bearings 10 and 8 is performed while preventing the falling of 0, and
And 8 to complete the assembly of the electric motor.

[0018]

As described above, according to the present invention, both the pair of bearings are fitted in the bearing support hole inside the boss portion of the stator with a gap, and the stopper is provided on the inner peripheral portion of the laminated core. Since the part prevents the lower bearing from falling off, the step of fitting the rotor rotation shaft inside the bearing is performed.
There is an advantage that the electric motor can be efficiently assembled without performing a troublesome process of crimping the tip of the boss portion of the stator, and the cost required for assembling the electric motor can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state when assembling an electric motor in an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which an electric motor is assembled by a conventional method.

FIG. 3 is a vertical cross-sectional view showing a state in which an electric motor is assembled by another conventional method.

[Explanation of symbols]

 1 Through Hole 2 Stator Frame 2a Boss Section 3 Laminated Core 4 Stator 5 Yoke 7 Rotor 1A, 1B Bearing Support Hole Section 8, 10 Bearing 9 Rotating Shaft 11 Core Piece 12 Stopper Section

Claims (1)

(57) [Claims] 1. A stator frame having a tubular boss portion in which both end portions of an inner through hole are bearing supporting hole portions having a diameter larger than that of other portions of the through hole, and a part of the stator frame. A laminated core fixed to the outer periphery of the tip end portion of the boss portion in a state of protruding from the tip end of the boss portion, and a pair of bearings fitted in the bearing support hole portions at both ends of the through hole of the boss portion, respectively. A stator provided and a rotor having a rotation shaft protruding from the center of a bowl-shaped yoke having a magnet attached to the inner periphery thereof are prepared, and the rotor is arranged with the rotation shaft facing vertically upward.
By performing the step of fitting the rotary shaft inside the pair of bearings with the tip of the boss portion of the stator arranged above the rotor facing downward, the rotary shaft is inserted through the pair of bearings. A method of assembling an electric motor supported on a stator, comprising: a core forming a laminated core having a stopper portion protruding inward in a radial direction on an inner peripheral portion of the laminated core protruding from a tip of a boss portion of the stator. The pair of bearings are formed by a piece, and the stoppers prevent the bearings fitted in the bearing support holes on the tip end side of the boss portion from falling off while fitting the rotary shaft inside the pair of bearings. A method of assembling an electric motor, which comprises performing steps.