OIL ENTRY PREVENTION STRUCTURE FOR BRUSH MOTOR UNIT

摘要

PROBLEM TO BE SOLVED: To provide an oil entry prevention structure for a brush motor unit having an output shaft equipped with a helical gear, to prevent grease oil from the helical gear portion from entering the motor housing.;SOLUTION: A one-way fan 109 rotating only in one direction is provided on a rotary shaft 102b in a motor housing 101 of a brush motor 100 having an output shaft 104 equipped with a helical gear 108. The lotus tooth of the helical gear 108 pushes out the grease oil at the helical gear portion in the direction of the brush motor 100 when the helical gear 108 rotates in the direction. The vanes of the one-way fan 109 are arranged to generate wind W toward the gap between the output shaft 104 and a bearing 107 provided on the motor housing 101 and supporting the output shaft 104 when the one-way fan 109 is rotating.;COPYRIGHT: (C)2009,JPO&INPIT