Patent ID: 7582994
Filing Date: 2009-09-01
Classification: A61H,B25J,H02K,Y10T

Abstract:
1. An electric actuator, comprising: an electric motor; and a speed reducer connected to the electric motor, wherein the speed reducer is a wave gear speed reducer comprising an internal gear, a flexible annular external gear, and a wave generator which elliptically flexes the external gear so as to partially mesh the external gear with the internal gear, the wave generator being connected to a rotor of the electric motor, one of the internal gear and the external gear being secured to a case of the speed reducer, and the other gear being rotatively decelerated as the wave generator rotates, and wherein the wave generator has an elliptical cam with a plurality of through-holes opened in an axial direction with intervals provided in a circumferential direction, the elliptical cam including a vane portion for blowing air in the axial direction that is formed by a partitioning portion between the through-holes, said partitioning portion being inclined in the circumferential direction with respect to the axial direction of the wave generator, and air is blown in by the vane portion, thereby air-cooling the electric motor.