Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-07-30
1988-05-24
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310241, 310242, 310244, 310248, H02K 1300
Patent
active
047468297
ABSTRACT:
An improved brush gear assembly for use in a miniature motor. The brush gear assembly is mounted within the interior of the end cap of the motor and basically consists of three parts: a terminal element or fitting, a brush leaf element, and a brush. The terminal element consists of a generally planar brass part, a major part of which is defined as an elongated rectangular portion. One end of the rectangular portion defines a bending end. Near the bending end are disposed three staggered projections arranged generally in line adjacent to a transverse bending line formed on the rectangular portion. The leaf spring is formed from a substantially elongated planar copper strip, which has one end terminating in a bending portion. The remainder of the strip constitutes a spring portion and terminates at its other end in a brush receiving portion, which is reinforced by bending the sides in an upward direction. In a preferred embodiment, the planar part of the distal end of the brush portion is bent at an approximately 20 degree angle relative to the planar part of the proximal end of the brush portion. The bending portion of the brush leaf contains a transverse bending line spaced a predetermined distance from the end of the leaf spring. Defined within the area between the end and the bending line are three apertures offset relative to each other in order to ensure proper orientation of the brush leaf relative to the terminal when the apertures are mated with projections. By a conventional technique, such as by a punch and anvil, the projections are dimpled and their peripheral edges are caused to expand to secure the brush leaf to the terminal. The brush leaf is then bent in the direction of the terminal so that an angle of approximately 71 degrees is provided between the planar surface of the terminal and the planar spring portion of the brush leaf. After this has been accomplished, the terminal portion is bent along the bending line so that an angle of approximately 69 degrees is provided between the bending portion of the planar portion of the terminal. Because the terminal portion has a lesser angle than the brush leaf, the brush leaf will be maintained in intimate contact with the bending portion of the terminal.
REFERENCES:
patent: 4195242 (1980-03-01), Mabuchi
patent: 4254353 (1981-03-01), Matsuda
patent: 4368398 (1983-01-01), Mabuchi
patent: 4431933 (1984-02-01), Mabuchi
patent: 4494029 (1985-01-01), Hoshino
patent: 4574215 (1986-03-01), Mabuchi
Johnson Electric Industry Manufactory, Limited
Skudy R.
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