| CPC F16D 65/0006 (2013.01) [F16D 55/226 (2013.01); F16D 65/095 (2013.01); F16D 65/18 (2013.01); F16D 2121/04 (2013.01)] | 7 Claims |
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1. A disk brake apparatus comprising:
a caliper body positioned on an outer circumference of a disk;
a piston member positioned in the caliper body and configured to move when a hydraulic pressure is applied to the piston member;
a brake pad pressed toward the disk by the piston member; and
a shim plate having a plate shape, positioned between the piston member and the brake pad, and abutting on a piston contact part positioned on a surface of the piston member and facing the brake pad,
wherein the shim plate comprises:
a cover shim in contact with the piston contact part; and
a pad shim stacked on a surface of the cover shim, facing the brake pad, and having a region at least partially overlapping the piston contact part and having an opening, and
wherein:
the piston contact part is a ring-shaped piston contact part,
the opening has an arc-shape around a center of the ring-shaped piston contact part,
an inner diameter of the opening is greater than an inner diameter of the ring-shaped piston contact part and less than an outer diameter of the ring-shaped piston contact part,
an outer diameter of the opening is greater than the outer diameter of the ring-shaped piston contact part so that the opening extends over the outer diameter of the ring-shaped piston contact part and so that no opening portion is provided in the pad shim within an area of the pad shim overlapping an area of the piston member which is within the inner diameter of the ring-shaped piston contact part, and
the cover shim is located between the opening in the pad shim and the ring-shaped piston contact part so that the opening in the pad shim is separated from the ring-shaped piston contact part by the cover shim.
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