Supporting structure for a rotor

Details Supporting structure for a rotor Supporting structure for a rotor

2001-05-04

2002-07-02

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S090000, C310S06700R

Reexamination Certificate

active

06414411

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 has a distal end face supported by a supporting portion of a supporting member, and wherein a permanent magnet and a balance plate attract each other such that the rotor shaft, except the distal end thereof, is not in frictional contact with the axle tube during rotation, thereby reducing the rotational noise and lengthening the longevity of the motor.
2. Description of the Related Art
FIG. 1
of the drawings illustrates 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 always 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.
It is another object of the present invention to provide a supporting structure for a rotor of a motor to thereby reduce the rotational noise and lengthen the longevity of the motor.
The present invention provides a combination of a rotor and a supporting structure for the rotor. The combination comprises an axle, a fixing member securely mounted in the axle tube, a supporting member securely mounted in the lower end of the axle tube, and a rotor having a shaft base and a shaft extending from the shaft base. The shaft includes an engaging groove. The shaft is extended through the fixing member with an end face of a distal end of the shaft rotatably resting on the supporting member and with the fixing member engaging with the engaging groove of the shaft. The shaft further includes an auxiliary supporting section, the auxiliary supporting section and an inner periphery of the axle tube having a minimal gap therebetween.


REFERENCES:
patent: 3513339 (1970-05-01), Harris et al.
patent: 3772544 (1973-11-01), Wrobel
patent: 4130770 (1978-12-01), Wrobel
patent: 4612468 (1986-09-01), Sturm et al.
patent: 5245236 (1993-09-01), Horng
patent: 5258672 (1993-11-01), Wrobel
patent: 5610462 (1997-03-01), Takahashi

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