Patent ID: 6446768
Filing Date: 2002-09-10
Classification: B60T,F16D

Abstract:
An actuator for actuating a brake device, said brake device including a rotatable body and a friction member, said rotatable body being connected to an axle shaft of a vehicle and integrally rotating with said axle shaft, said friction member being movable between an engaged position where said friction member is biased into engagement with said rotatable body to apply a braking force against said rotatable body and a disengaged position where said friction member is disengaged from said rotatable body, said actuator comprising:a driving motor that rotates forward and backward to generate a driving force to move said friction member between said engaged position and said disengaged position; a driving force transmitting means for transmitting said driving force of said driving motor to said friction member, said driving force transmitting means including: a rotatable element that rotates forward and backward as said driving motor rotates forward and backward, respectively; and an operation shaft that moves said friction member between said engaged position and said disengaged position based on said forward and backward rotation of said rotatable element, respectively; a rotation regulating means that is movable between an engaged position where said rotation regulating means is engaged with said rotatable element and a disengaged position where said rotation regulating means is disengaged from said rotatable element, wherein: while said rotation regulating means is in said engaged position, said rotation regulating means prevents at least one of forward and backward rotations of said rotatable element; and while said rotation regulating means is in said disengaged position, said rotation regulating means allows said at least one of said forward and backward rotations of said rotatable element; and an electric switching means for switching said rotation regulating means between said engaged position and said disengaged position, said electric switching means being energized such that said electric switching means places and holds said rotation regulating means in said disengaged position while said vehicle is running.