Brush and brush housing arrangement to mitigate hydrodynamic...

Details Brush and brush housing arrangement to mitigate hydrodynamic... Brush and brush housing arrangement to mitigate hydrodynamic...

2006-05-11

2010-10-26

Tamai, Karl I (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

07821178

ABSTRACT:
A direct current electric motor brush and brush housing arrangement which significantly reduces the effect of brush lift in a brushed motor containing viscous fluid. The brush housing enables viscous fluid to avoid momentum transfer into the brushes by providing two or more pressure relief channels that provide the fluid with direct radial exits along the direction of the brush, potentially reducing the brush lift due to the fluid being forced between a rotating commutator and its associated brushes. The pressure relief channels may be located in the housing immediately adjacent to the brush, being radially disposed to the leading face (or leading and trailing faces) of each brush, or in the leading face (or leading and trailing faces) of each brush itself, and may include additional channels in the housing near but not immediately adjacent the brushes.

REFERENCES:
patent: 3171050 (1965-02-01), Gordon
patent: 3353047 (1967-11-01), Buchwald
patent: 4160629 (1979-07-01), Hidden et al.
patent: 4619588 (1986-10-01), Moore, III
patent: 2006/0261701 (2006-11-01), Camwell et al.
patent: 02174533 (1990-07-01), None
Grossman, M.I., et al. Elecktromashinostroenie i Elektrooborudovanie, No. 25, 1977, p. 107-110 and the English translation.

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