Supporting structure for a motor rotor

Details Supporting structure for a motor rotor Supporting structure for a motor rotor

1999-12-02

2001-07-24

Waks, Joseph (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S091000

Reexamination Certificate

active

06265797

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a supporting structure for a motor rotor that includes a support member secured in the axle tube for supporting an end of the rotor shaft, thereby allowing stable rotation of the rotor.
2. Description of the Related Art
Applicant's U.S. patent application Ser. No. 09/366,636 filed on Aug. 4, 1999 discloses positioning structures for a motor rotor, wherein an axle tube
3
is extended through a stator bobbin
1
and a circuit board
2
and includes a bearing
31
mounted in the axle tube for pivotally support a rotor shaft
41
of the rotor
4
. A support element
32
is mounted to a lower end of the axle tube
32
for supporting a lower end of the rotor shaft
41
. Thus, the rotor shaft rotates stably about a fixed axis. Rotational noise of the motor is lowered and life of the motor is lengthened.
Nevertheless, a pressing process is required to securely position the support element
32
in the axle tube
3
to thereby prevent disengagement of the supporting element
32
. During assembly, the axle tube
3
is incapable of resisting the pressure from the support element
32
at pressing process and thus the stator bobbin
1
and the circuit board
2
may be loosen and displaced from the axle tube, which is undesired.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a supporting structure with a support member for a motor rotor, wherein the axle tube is capable of resisting the pressure from the support element to thereby retain the axle tube in place without displacement at pressing process.
It is a secondary object of the present invention to provide a supporting structure with a support member for a motor rotor, thereby providing a better heat dissipating effect and lengthening the life of the motor.
It is another object of the present invention to provide a supporting structure with a support member for a motor rotor, wherein the support element for supporting the rotor shaft provides a better shock-absorbing effect to lower rotational noise of the motor and lengthen the life of the motor.
In accordance with the present invention, the rotor further includes a number of through-holes on a top surface through which posts of a die are extended to thereby allow the posts to bear against an end flange of the axle tube. The die resists the pressure from the support element during pressing of the support element, thereby retaining the axle tube in place. Heat generated during rotation of the rotor and heat from the stator winding can be dissipated via the through-holes on the top surface of the rotor, thereby providing a better heat-dissipating effect. A bottom of the support element has a hole defined therein and covered by a pad that supports an end of the rotor shaft for absorbing the load from the rotor shaft.
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: 4955791 (1990-09-01), Wrobel
patent: 5065060 (1991-11-01), Takahashi et al.
patent: 5093599 (1992-03-01), Horng
patent: 5610462 (1997-03-01), Takahashi
patent: 5831355 (1998-11-01), Oku
patent: 6097121 (2000-08-01), Oku

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