Patent ID: 9568058
Date: 2017-02-14
CPC Classifications: F16D

Claim:
1. A disc brake, comprising: a pair of pads arranged on both sides of a rotor in an axial direction of the rotor; a piston configured to press one of the pair of pads against the rotor: a caliper main body including a cylinder in which the piston is movably arranged; an electric motor installed on the caliper main body; and a rotary-to-linear conversion mechanism installed on the caliper main body, which is configured to thrust the piston so as to hold the piston in a braking position, wherein: the rotary-to-linear conversion mechanism comprises: the shaft member comprises a first thread threadedly fitted to the rotation transmission member, which is formed on one end side of the shaft member, and a second thread threadedly fitted to the ball-and-ramp mechanism, which is formed on another end side of the shaft member; and a rotation friction torque of the first thread is larger than a rotation friction torque of the second thread.