Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-02-06
2002-06-04
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S049540, C310S06700R
Reexamination Certificate
active
06400054
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fixing structure for an axle tube of a motor, wherein the axle tube can be fixed easily and a longitudinal central axis of the axle tube is orthogonal to a plane on which the support member for the axle tube locates, thereby providing stable and non-tilt rotation for the rotor.
2. Description of the Related Art
FIGS. 1 and 2
illustrate a conventional motor comprising a metal plate
90
that is punched to form a tube
901
around which a circuit board
91
and a stator bobbin
92
are mounted. An axle tube
93
is extended through the circuit board
91
and the stator bobbin
92
and mounted into the tube
901
. The axle tube
93
includes a bearing
931
mounted therein for rotatably holding a shaft
941
of a rotor
94
. The shaft
941
extending through the bearing
931
is retained in place by a retaining element, such as a C-clip
95
. A distal end of the shaft
94
rests on a bottom wall of an end cap
96
secured in an end of the axle tube
93
.
In such a conventional motor, the tube
901
must be formed by punching. In addition, the tube
901
must be in an extremely tight engagement with the axle tube
93
by powerful punching. This requires highly precise punching device
2
to accomplish the extremely tight engagement between the axle tube
93
and the tube
901
after they are engaged. If the tube
901
is not in extremely tight engagement with the axle tube
93
, the shaft
941
of the rotor
94
supported in the axle tube
93
will wobble while rotating. In addition, the longitudinal axis of the axle tube
93
must be exactly orthogonal to a plane on which the metal plate
90
locates. Otherwise, the rotor
94
cannot rotate in a stable and balanced state and noise is generated and the longevity thereof is shortened. In a case that the tube
901
is made from plastic material, the axle tube
93
and the tube
901
may be loosened from each other or even damaged after they are punched, as the axle tube
93
and the tube
901
are made from different material and thus have different heat-expansion coefficients. In addition, the axle tube
93
and the tube
901
are engaged in a way that is difficult to keep the rotor
94
rotating in a stable state after the rotor
94
is mounted in the bearing
931
in the axle tube
93
.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a fixing structure for an axle tube of a motor, wherein the axle tube can be fixed easily and a longitudinal central axis of the axle tube is orthogonal to a plane on which the support member for the axle tube locates.
A fixing structure for an axle tube of a motor comprises a support member including an assembly hole through which a relatively smaller outer diameter portion of an outer periphery of an end cap extends. The end cap includes a relatively larger outer diameter portion having an end face abutting against a lower side of the support member. The relatively smaller outer diameter portion of the end cap is extended through the assembly hole of the axle tube and engaged with a relatively larger inner diameter portion of an axle tube that further includes a relatively smaller inner diameter portion in which a bearing is secured. An end face of the axle tube abuts against an upper side of the support member while the relatively larger outer diameter portion of the end cap abuts against the lower side of the support member, thereby sandwiching the support member.
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: 4164690 (1979-08-01), Muller et al.
patent: 4987331 (1991-01-01), Horng
patent: 5245236 (1993-09-01), Horng
patent: 5947704 (1999-09-01), Hsieh
patent: 6050785 (2000-04-01), Horng
patent: 6121710 (2000-09-01), Ho
Bacon & Thomas PLLC
Nguyen Tran
NS Motor Technology Co., Ltd.
LandOfFree
Fixing structure for an axle tube of a motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fixing structure for an axle tube of a motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fixing structure for an axle tube of a motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2893380