Patent ID: 9088185
Filing Date: 2015-07-21
Classification: F16D,H02K

Abstract:
1. An electromechanical actuator, comprising: an electric motor that generates driving force in a rotational direction; a power transmission mechanism that has a nut portion and a screw portion, converts the driving force of the electric motor in a rotation direction into driving force in a linear direction, and transmits the driving force as a result of the nut portion and the screw portion rotating relatively to each other; and an output portion that outputs driving force in a linear direction by being displaced together with one of the nut portion and the screw portion that serves as a linear displacement portion that is displaced in the linear direction, the electromechanical actuator further comprising a power disconnection mechanism capable of breaking connection of a driving force transmission path between the electric motor and one of the nut portion and the screw portion that serves as a rotational portion that rotates upon rotation of the electric motor being transmitted thereto, and disconnecting transmission of power, the power disconnection mechanism comprising: a case portion that has a cylindrical hollow portion and is fixed with respect to, or connected via a gear portion to, one of the rotational portion and the electric motor; an inner shaft portion that has a shaft-like portion and is installed within the case portion and is fixed with respect to, or connected via the gear portion to, the other of the rotational portion and the electric motor; a supporting portion that is installed between the case portion and the inner shaft portion so as to be able to support a load acting in a direction parallel to an axial direction of the case portion and the inner shaft portion, integrated with, or inserted into, one of the case portion and the inner shaft portion, and rollable or slidable with respect to the other of the case portion and the inner shaft portion; and a connecting member that connects the case portion to the inner shaft portion, wherein the other of the case portion and the inner shaft portion is provided with an axial groove along which the supporting portion can roll or slide, and that extends parallel to the axial direction of the case portion and the inner shaft portion, and a circumferential groove along which the supporting portion can roll or slide, and that extends along the circumferential direction of the case portion and the inner shaft portion, and the connecting member breaks connection between the case portion and the inner shaft portion and disconnects transmission of the power when torque of a prescribed amount or larger acts between the case portion and the inner shaft portion.