Patent ID: 6458058
Filing Date: 2002-10-01
Classification: F16H,Y10T

Abstract:
A speed reducer in a portable electric tool, comprising:a gear box, a motor, and an end planetary gear set driven by the motor, and a output shaft with two ends; characterized in that the output shaft provides an end thereof with an internal gear disk, the internal gear disk further provides a plurality of internal circular teeth; the end planetary gear set provides a plurality of planetary gears and each planetary gear extends outward two oppositely parallel positioned over pins from a lateral end face thereof with respect to an axial center thereof; the over pins provide a rotational radius smaller than a radius of each planetary gear respectively and each one of the over pins is disposed at two of the internal circular teeth; whereby, as soon as the motor is started to run, the output shaft can rotate by way of being driven by the planetary gear set.