Supporting structure for a rotor

Details Supporting structure for a rotor Supporting structure for a rotor

2001-04-04

2004-04-13

Le, Dang (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R

Reexamination Certificate

active

06720694

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a supporting structure for a rotor, wherein the rotor shaft and the supporting member of the supporting structure have the smallest contact area while providing stable and non-skew rotation for the rotor.
2. Description of the Related Art
FIGS. 1 and 2
of the drawings illustrate a conventional motor structure that comprises a metal axle tube
90
, a stator
91
mounted around the axle tube
90
, a circuit board
92
, and a balance plate
98
. An oily bearing
93
is tightly engaged in the axle tube
90
for rotatably supporting a shaft
95
of a rotor
94
. A distal end of the shaft
95
is rotatably supported by a support member
96
. The rotor
94
rotates stably by means of mutual attraction between a permanent magnet
97
on the rotor
94
and the balance plate
98
.
In such a conventional motor, the rotor
94
could not rotate smoothly, as the lubricating oil in the oily bearing
93
leaks after the oily bearing
93
has been used for a period of time. In addition, the shaft
95
of the rotor
94
and the oily bearing
93
have a relatively large contact area therebetween. As a result, a relatively large friction exists and a larger noise is generated during rotation of the rotor
94
. Furthermore, the cost for processing and manufacturing such a conventional motor is high.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a supporting structure for a rotor. The supporting structure can be manufactured conveniently. In addition, the shaft of the rotor and the supporting member for the shaft have a relatively smaller contact area therebetween.
In accordance with the present invention, a supporting structure is provided for the rotor and includes a metal axle tube, a holding member securely mounted in the axle tube, a supporting member securely mounted in the axle tube and including a supporting portion, and a fixing member securely mounted in the axle tube and including an opening. The holding member includes a hole and an inner flange is formed on an inner periphery defining the hole.
A shaft is provided to a center of the rotor and includes an engaging groove. The shaft is extended through the hole of the holding member and the opening of the fixing member with an end face of a distal end of the shaft rotatably resting on the supporting portion of the support member and with the fixing member engaging with the engaging groove of the shaft, whereby the shaft and the inner flange of the holding member have a slight contact therebetween.
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: 4620139 (1986-10-01), Egami et al.
patent: 4922162 (1990-05-01), Shiraki et al.
patent: 5258672 (1993-11-01), Wrobel
patent: 5274289 (1993-12-01), Wrobel
patent: 5363003 (1994-11-01), Harada et al.
patent: 5715116 (1998-02-01), Moritan et al.
patent: 5942823 (1999-08-01), Higuchi et al.
patent: 6000919 (1999-12-01), Hsieh
patent: 6183221 (2001-02-01), Hsieh
patent: 6267567 (2001-07-01), Hsieh
patent: 6318976 (2001-11-01), Hsieh
patent: 6356408 (2002-03-01), Nii et al.
patent: 6455961 (2002-09-01), Higuchi
“Merriam-Webster's Collegiate Dictionary”, Tenth Edition, p. 1194.

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