BUILT-IN MOTOR TYPE PUMP DEVICE
Document Type and Number:
Japanese Patent JP2604077
PURPOSE: To reduce noise generated in the vicinity of slit portions of a commutator during operations of a built-in motor type pump device.
CONSTITUTION: A pump unit and a DC motor are enclosed in a casing 1. A gap space 31 is provided between a brush holder 4 provided on one end of the casing 1 and a terminal holder 5 covering the brush holder 4 as a silencing chamber. The gap space 31 is connected to the inner space of the casing 1 through a penetrating hole 32. Thereby fluid intercepting sound generated in the vicinity of slit portions 20 of a commutator 18 of the DC motor can be absorbed in the gap space 31 to reduce noise generated from the whole pump device.
January 29, 1997
September 27, 1991
HONDA MOTOR CO LTD
F02M37/08; F04D5/00; F04D13/08; F02M37/08; F04D5/00; F04D13/06; (IPC1-7): F04D5/00; F02M37/08; F04D13/08