Patent ID: 8925690
Filing Date: 2015-01-06
Classification: F16D

Abstract:
1. A disc brake apparatus which comprises a disc rotor attached to a rotating member and rotating unitarily with the rotating member, a caliper attached to a support body in such a manner as to straddle a partial circumference of the disc rotor, a pair of brake pads disposed in such a manner as to be able to nip the disc rotor, and supported via a support shaft by the caliper in such a manner as to be movable in an axial direction of the disc rotor, and pistons attached to the caliper and adapted to press the brake pads toward the disc rotor, and which is configured such that the pistons press back plates of the brake pads, whereby linings of the brake pads are slidably pressed against braking surfaces of the disc rotor, thereby braking the disc rotor, V-shaped radially inner torque reception surfaces being located at positions corresponding to radially inner, circumferentially central portions of the linings with respect to radial and circumferential directions of the disc rotor, radially outer torque reception surfaces being located at positions corresponding to radially outer, circumferentially intermediate portions of the linings with respect to the radial and circumferential directions of the disc rotor, wherein the brake pads are biased inward with respect to a radial direction of the disc rotor by biasing members, the support shaft is composed of a single radially inner support shaft provided unitarily with the caliper and engaged with the V-shaped radially inner torque reception surfaces of the back plates at two locations on each of the V-shaped radially inner torque reception surfaces, and a radially outer support shaft provided unitarily with the caliper and engaged with the radially outer torque reception surfaces of the back plates at one location on each of the radially outer torque reception surfaces, and the brake pads are attached to the radially inner support shaft in such a manner as to be rotatable by a predetermined amount about an axis of the radially inner support shaft, an inner shim and an outer shim intervene between each of the back plates and each of the pistons in such a manner that the inner and outer shims are disposed toward the back plate and the piston, respectively, and a friction coefficient between the back plate and the inner shim and a friction coefficient between the piston and the outer shim are higher than a friction coefficient between the inner shim and the outer shim, the inner shim is attached to the back plate in such a manner as to be movable unitarily with the back plate in the radial direction of the disc rotor and in the circumferential direction of the disc rotor, and to be movable relative to the back plate in the axial direction of the disc rotor, and the outer shim is attached to the back plate in such a manner as to be movable unitarily with the back plate in the radial direction of the disc rotor and in the circumferential direction of the disc rotor, to be movable relative to the back plate in the axial direction of the disc rotor, and to be rotatable by a predetermined amount about the axis of the radially inner support shaft.