Motor and manufacturing method thereof

Details Motor and manufacturing method thereof Motor and manufacturing method thereof

2000-03-30

2001-06-05

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C029S596000, C074S60600R, C310S07500D, C310S089000

Reexamination Certificate

active

06242824

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATION
The present invention is related to Japanese patent application No. 2000-25197, filed Feb. 2, 2000, the contents of which are incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to a motor and, more particularly, to a motor having a speed reducer and a method for assembling the motor's speed reducer to the motor's body.
BACKGROUND OF THE INVENTION
In the prior art, a motor used in a power window device or the like has a motor body and a speed reducer. The motor body has a yoke housing, wherein a spindle having an armature is rotatably supported. The speed reducer has a gear housing, wherein a worm shaft and a worm wheel are housed. The worm wheel is meshed with the worm shaft. The yoke housing and the gear housing are assembled by moving them in the axial direction. Moreover, the spindle and the worm shaft are coupled on a common axis before the yoke housing and the gear housing come into abutment.
When the spindle of the motor body is rotationally driven, the worm shaft is rotated according to the rotational direction of the spindle. As the worm shaft rotates, the worm wheel rotates at a speed lower than that of the worm shaft but with high torque. Then, the output shaft, coupled to the worm wheel, rotates to transmit its rotating force to an external load.
However, when the yoke housing and the gear housing of the motor are assembled, the mounting area for the spindle and the mounting area for the worm shaft must be aligned (or fitted) while being accurately held on the common axis. This is troublesome and difficult.
On the other hand, the spindle mounting area and the worm shaft mounting area have to be made such that they can be fitted (or connected) in the axial direction when their relative rotational positions are at predetermined positions. As such, they engage in the rotational direction and cannot rotate relative to each other when they are fitted (or connected). For this requirement, the connection portions have a D-shaped fitting bulge and a D-shaped fitting recess. When the yoke housing and the gear housing are assembled, however, the bulge and recess have arbitrary rotational positions. As such, it is also troublesome to position the bulge and recess in the proper rotational direction for their connection (or fitting). As a result, assembly time is increased. The present invention was developed in light of these drawbacks.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a motor housing being easily capable of being coupled to a gear housing.
A motor is provided wherein a spindle of a motor body and a worm shaft of a speed reducer are easily coupled. When a yoke housing and a gear housing are to be assembled, first engaging bulges and on the side of the yoke housing and second engaging bulges and on the gear housing are engaged to position a spindle and a worm shaft on a common axis. If the relative rotational positions of a two-plane width bulge of the spindle and a two-plane width hole of a clutch coupled to the worm shaft fail to be located at predetermined positions, the two-plane width bulge is fitted in the two-plane width hole by driving the spindle rotationally while urging the yoke housing and the gear housing in the assembled direction.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.


REFERENCES:
patent: 1945361 (1934-01-01), Ball
patent: 2306233 (1942-12-01), Smith
patent: 3269204 (1966-08-01), Schleicher
patent: 4227104 (1980-10-01), Hamman
patent: 5015897 (1991-05-01), Inagaki et al.
patent: 5041751 (1991-08-01), Yokozuka
patent: 5056213 (1991-10-01), Behnke et al.
patent: 5216307 (1993-06-01), Hosoya

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