Integral-type disk brake

An integral-type disk brake comprising:

• a caliper assembly which further comprises a caliper body, an inner pad held to a piston via a spring member within the caliper body, and an outer pad held opposite to the inner pad and kept at a certain distance from the inner pad via a spring member;
• a pair of arms circumferentially spaced a certain distance from each other along the outer periphery of a disk rotor mounted on a support, the caliper assembly being disposed between the arms so as to extend over the outer periphery of the disk rotor;
• a pair of protrusions extending radially outwardly from opposite ends of metal back plates attached to the inner and outer pads, the opposite ends being at the side of the outer periphery of the disk rotor, the protrusions being in engagement with the arms on the support, and the caliper assembly being held to the support in such a way that it can slide axially of the disk rotor;
• and
• a pair of spring members mounted at opposite ends of the metal back plate attached to the outer pad, the opposite ends being at the side of the axis of the disk rotor, the spring members extending toward the outer periphery of the disk rotor and being capable of being circumferentially deflected toward and away from each other, front ends of the pair of spring members being in resilient contact with bottom surfaces of the arms which are at the side of the axis of the disk rotor wherein the bottom surfaces of the arms with which the front ends of the pair of spring members are in resilient contact incline circumferentially outwardly as said bottom surfaces move toward the axis of the rotor each of the pair of spring members further comprise leaf spring means which include a U-shaped mounting portion, a bent portion formed like a loop, a flat plate portion extending from the front end of the bent portion in such a way that a front end thereof engages with a respective one of the inclined surfaces of the arms, the mounting portion having a pair of fingers which resiliently grip the side ends of the metal back plate attached to the outer pad on axially opposite sides of the disk rotor, the bent portion extending from the side end of the mounting portion which is at the side of the axis of the disk rotor and to which the fingers of the mounting portion are attached and wherein the bent portions of the spring members are spaced apart a distance less than the distance between the arms such that said caliper assembly is insertable between said pair of arms in a radially inward direction.