ELECTRIC ACTUATOR FOR VEHICLE

摘要

PURPOSE: A car electric actuator is provided to improve wear resistance of the external teeth and/or weight balance of a gear by including an electric motor and a step-down gear device. CONSTITUTION: A car electric actuator includes an electric motor (3) and a step-down gear device (4). The electric motor produces rotatory power when being supplied with power. The step-down gear device includes multiple gears which are arranged to amplify the rotatory power which is delivered from the electric motor. The width of the surface of multiple external teeth (6), which are arranged on the front and the rear in the circumferential direction, is changed by the rotational direction of at least one object gear; and the width of the surface is measured along the axial direction of at least one object direction within a teeth section of at least one object gear (5) in the multiple gears of the step-down gear device.