ELECTRIC LINEAR ACTUATOR AND ELECTRIC BRAKE DEVICE

摘要

It is an object of the present invention to assemble an electric linear motion actuator easily. The electric linear motion actuator includes an electric motor (30), a drive shaft (27) configured to be rotated by the electric motor (30), a rotation-to-linear motion converting mechanism (50) configured to convert the rotational motion of the drive shaft (27) to the axial linear motion of an axially movably supported outer ring member (22), and an electric locking mechanism (70) incorporated in a reduction gear mechanism (40) in which the rotation of a rotor shaft (33a) of the electric motor (30) is reduced in speed and transmitted to the drive shaft (27). When the electric locking mechanism (70) is energized, the power transmission path (reduction gear mechanism (40))shifts to the locked state in which power cannot be transmitted through the power transmission path, and when the electric locking mechanism (70) is de-energized thereafter, the power transmission path is kept in the locked state. The electric locking mechanism (70) is built in a motor case (31) of the electric motor (30) so that the electric motor (30) and the electric locking mechanism (70) are unitized.