Patent ID: 9205825
Filing Date: 2015-12-08
Classification: B60T,F16D

Abstract:
1. An electric brake apparatus for a vehicle, comprising: a brake rotation body which rotates together with a wheel; an electric caliper which includes a piston for pressing a brake friction member, facing a frictional sliding surface of the brake rotation body, toward the frictional sliding surface, a cylinder accommodating the piston such that the piston can advance and retract, and electric drive means for applying to the piston a pressing force for pressing the brake friction member; free rotation permission means for permitting free rotation of an electric motor which constitutes the electric drive means and which generate the pressing force for advancing the piston; and retraction means including reversing means for reversing the pressing force applied to the piston by the electric drive means so as to provide a reverse force which acts in a retraction direction of the piston, wherein when free rotation of the electric motor generating the pressing force is permitted by the free rotation permission means, the retraction means retracts the piston having advanced so as to press the brake friction member, through use of the reverse force provided by the reversing means, the piston is composed of a force transmission portion to which the pressing force generated by the electric drive means is transmitted, and a pressing portion which presses the brake friction member; the reversing means is disposed between the force transmission portion and the pressing portion; and the retraction means is configured such that, when free rotation of the electric motor generating the pressing force is permitted by the free rotation permission means, the retraction means unitarily retracts the force transmission portion and the pressing portion, which have advanced so as to press the brake friction member, by applying to the force transmission portion the reverse force provided by the reversing means.