Bearing structures for a motor rotor

Details Bearing structures for a motor rotor Bearing structures for a motor rotor

1999-12-28

2001-10-30

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C384S100000, C384S107000

Reexamination Certificate

active

06310415

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to bearing structures for a motor rotor, wherein a bearing structure with an axle hole is pressed and tightly fitted into an axle tube without causing deformation in an inner periphery defining the axle hole. A shaft of the rotor pivotally supported in the axle holes of the bearing may rotate smoothly without deviation.
2. Description of the Related Art
FIGS. 1 and 2
of the drawings illustrate a conventional motor rotor having a shaft
91
, a bearing
92
, and an axle tube
93
. The bearing
92
is generally an oil-pregnant copper bearing or non-ball type bearing. The bearing
92
is pressed into an interior of the axle tube
93
so as to be tightly engaged to an inner periphery of the axle tube
93
. The inner periphery radial deformation occurs during forced fitting of the bearing
92
. Adverse affection to rotation of the shaft
91
of the rotor occurs even though the deformation is very minor. As a result, rotational noise is generated and the motor operating life is shortened. More specifically, the length of the inner periphery of the bearing
92
is approximately the same as that of the outer periphery of the bearing
92
such that when the bearing is forced fitting into the axle tube
93
, the inner periphery
94
defining the axle hole of the bearing
93
resulted in irregular deformation. As a result, smooth surface of the shaft
91
becomes in contact with deformed inner periphery
94
of the axle hole of the bearing
92
. Accordingly, noise is generated during rotation of the shaft
91
and the motor operating life is shortened.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a bearing structure that solves the above-mentioned problems. This object is achieved by means of reducing deformation of the bearing in the axle tube, thereby providing smooth rotation for the shaft of the rotor.
A bearing structure in accordance with the present invention includes an outer periphery with an engaging portion tightly engaged to an inner periphery of an axle tube. The bearing structure further includes an axle hole for pivotally supporting a shaft of the motor rotor. A longitudinal length of the axle hole is greater than that of the engaging portion. Thus, when the bearing is engaged into the axle tube, minor deformation is generated in the inner periphery of the bearing corresponding to the engaged area between the inner periphery of the axle tube and the engaging portion, thereby providing smooth rotation for the central axle of the rotor.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 5715116 (1998-02-01), Moritan et al.
patent: 6023114 (2000-02-01), Mori et al.
patent: 6084328 (2000-07-01), Yamashita et al.
patent: 6147424 (2000-11-01), Gomyo et al.

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