Dust guard

Details Dust guard Dust guard

1999-07-06

2000-08-01

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 88, H01R 3938, H02K 510

Patent

active

060971282

ABSTRACT:
A dust guard for a universal motor has a body with an aperture for press-fit mounting to a brush holder. A hood extends from the body to give the dust guard a cup-like shape. The edge of the hood is shaped to follow a commutator surface. The hood has a passageway in each lateral side for drawing dust laden air into the flow of cooling air for the motor. Air guides formed on the outside of the dust guard adjacent the exits of the passageways assist in drawing out the dust laden air from the interior of the hood. Oil reservoirs form dust collection sites within the dust guard. The oil reservoirs include recesses filled with closely spaced projections to retain oil in the recesses by capillary action.

REFERENCES:
patent: 1145516 (1915-07-01), Schmid-Roost
patent: 3791774 (1974-02-01), Vonk
patent: 4659950 (1987-04-01), Gotoh
patent: 4959576 (1990-09-01), Horibe et al.
patent: 5185544 (1993-02-01), Takada
patent: 5296772 (1994-03-01), Bradfield et al.
patent: 5424600 (1995-06-01), Ishikawa et al.
patent: 5517072 (1996-05-01), Hildebrandt
patent: 5550418 (1996-08-01), Chung
patent: 5895995 (1999-04-01), Soh
JP 4161036, Abstract, Jun. 4, 1992.

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