Miniature motor unit

Details Miniature motor unit Miniature motor unit

2000-02-10

2001-04-10

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S089000, C310S091000

Reexamination Certificate

active

06215208

ABSTRACT:

BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a miniature motor unit which has a configuration wherein a miniature motor is integrated with a motor mounting member.
b) Description of the Prior Art
Permanent-magnet field type miniature DC motors have conventionally been widely used for various types of compact appliance, portable appliances in particular, since these motors can be driven with batteries and have large torques for compact sizes of the motors. To mount these miniature motors on appliances to be driven with the motors, it is general to attach the motors to motor mounting members with screws.
FIGS. 1A and 1B
show an outside casing of a conventional miniature motor;
FIG. 1A
being a front view of a bottom of the casing and
FIG. 1B
being a side sectional view of the casing.
FIG. 2
is a partially sectional side view showing a condition where the motor using the outside casing is attached to a motor mounting member.
In
FIGS. 1A and 1B
, a reference numeral
1
represents the outside casing of the motor composed of an iron plate which is formed by drawing work or the like into a cup consisting of a cylindrical portion
1
a
and a bottom surface portion
1
b
. Outside a center of the bottom surface portion
1
b
, a bearing accommodator
2
is formed by drawing work to accommodate a bearing for an output shaft of a rotor. A reference numeral
3
designates a center hole to accommodate the bearing. Reference numeral
4
a
and
4
b
denote holes which are tapped inside and embossed inward at locations of the bottom surface portion which are apart 180° and symmetrical with regard to the center.
In
FIG. 2
, a reference symbol M represents a motor which uses the outside casing
1
, a reference numeral
5
designates a cover casing which is fitted over the outside casing
1
and made of an insulating material, a reference numeral
6
denotes a terminal for connection to a power source and a reference numeral
7
represents a rotor shaft. A reference numeral
8
designates a motor mounting member of an appliance (compact pump or the like) which is to be driven with the motor; the motor mounting member consisting, like the outside casing, of a cylindrical portion and a bottom surface portion, and having holes formed in the bottom surface portion at locations corresponding to the tapped holes
4
a
and
4
b
formed in the outside casing
1
. In addition, a center hole is formed in the bottom surface portion of the motor mounting member
8
to insert the bearing accommodator
2
.
The motor M is attached to the motor mounting member
8
by bringing the motor M into contact with the motor mounting member
8
so that the bottom surface portion of the outside casing is brought into contact with the bottom surface portion of the motor mounting member
8
, and tightening screws
9
a
and
9
b
into the tapped holes
4
a
and
4
b
of the outside casing
1
.
However, the conventional miniature motors such as that described above require screw tightening in narrow spaces of the motor mounting member and have a large number of defects including a defect that the motors hardly allow assembling works to be automated.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a miniature motor unit consisting of an outside casing of a motor which has a planar metal plate composing an output shaft side end of the motor and having a center hole or an output shaft side end made of a metal plate, and a motor mounting plate which has a planar plate portion having a center hole, wherein a plurality of mounting holes having fixing claws are formed in the output shaft side end of the outside casing of the motor, and at least two bosses are formed on the planar plate portion of the motor mounting plate at locations corresponding to the mounting holes formed in the outside casing so that the motor is fixed by tightening the bosses with the fixing claws in a condition where the output shaft side end of the motor is combined with the motor mounting member when the bosses of the motor mounting member are pressed into the mounting holes.
Another object of the present invention is to provide a miniature motor unit consisting of an outside casing of a motor which is made of a metal plate and has an output shaft side end having a center hole, and a motor mounting member which has a planar plate portion having a center hole, wherein a plurality of mounting holes are formed in the output shaft side end of the outside casing and at least two bosses are formed on a bottom surface portion of the motor mounting member at locations corresponding to locations of mounting holes formed in the outside casing so that the outside casing and the motor mounting member are fixed by thermally caulking or welding the bosses after combining the outside casing with the motor mounting member so that the bosses are inserted into the mounting holes formed in the motor mounting member.


REFERENCES:
patent: 4806811 (1989-02-01), Mayumi et al.

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