US 6,294,850 B1Granted

Small-sized motor

AssigneeMabuchi Motor Co., Ltd.

InventorsToshiya Yui, Kenji Furuya

Life of this patent

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Abstract

A small-sized motor includes an insulation holder (16) which is integrally molded from a synthetic resin. The insulation holder (16) includes a cover portion (13) for-covering the casing cover (5) from the outside thereof, and a pair of brush holders (12) which project from the cover portion (13) into the interior of the motor, while passing through cut portions formed in the casing cover (5). Each of the brush holder (12) supports a brush arm (17) and an input terminal (11) connected thereto. The brush arm (17) supports a brush (18). Bearings (3) and (6) for the shaft are respectively supported at the center of the bottom portion of the casing (2) and at the center of the casing cover (5). Thus, it becomes possible to realize stable bearing alignment and to provide insulation outside the motor to thereby enable attachment of an electrical element to the motor without use of any additional insulation means.

Claims2

Dependent claims

A small-sized motor comprising:

a metallic casing having a closed-bottomed cylindrical shape and including a magnet attached to an inner surface thereof;
a metallic casing cover fitted to the casing so as to close an opening portion of the casing;
and a rotor including a shaft, a laminated core, windings wound around the laminated core, and a commutator mounted on the shaft, wherein
the motor further comprises an insulation holder integrally molded from a synthetic resin, the insulation holder having a cover portion for covering the casing cover from the outer side thereof, and a pair of brush holders which project from the cover portion into the interior of the motor, while passing through cut portions formed in the casing cover;
each of the brush holders supports a brush arm and an input terminal connected thereto, the brush arm supporting a brush;
bearings for the shaft are respectively supported at the center of the bottom portion of the casing and at the center of the casing cover.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/491,776Filed 26 Jan 2000
Priority: JP 11-02121329 Jan 1999
Granted: 25 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02K 5/1672
Using sliding-contact or spherical cap bearings: radially supporting the rotary shaft at both ends of the rotor
H02K 5/08
Casings or enclosures characterised by the shape, form or construction thereof: insulating casings
H02K 5/145
For cooperation with commutators: fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
H02K 5/15
Casings or enclosures characterised by the shape, form or construction thereof: mounting arrangements for bearing-shields or end plates

Family

No related US applications are recorded in the indexed filing history.

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Citations

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