| 摘要 |
The present invention is provided with: a feed screw mechanism (13a) to push, on the basis of rotation of an electric motor (9a), a piston (12a) to the outer side until a gap between an inner pad (2a) and a rotor side face is eliminated; a ball ramp mechanism (22) to push, on the basis of the rotation of the electric motor (9a), the piston (12a) to the outer side after the gap is eliminated; and a self-servo mechanism (69) to generate, on the basis of a brake tangential force that acts on the inner pad (2a) by way of the inner pad (2a) pressing into the rotor by operation of the ball ramp mechanism (22), an axial force in the direction in which the inner pad (2a) is pressed into a rotor. In addition, a second thrust ball bearing (53) is provided to receive the reactive force of the axial force generated by the self-servo mechanism (69). |
