CALIPER BRAKE
Disclosed is a caliper brake including a carrier on which a pair of pad plates are installed to advance and retreat, a caliper housing slidably installed on the carrier and provided with a cylinder, a piston installed in the cylinder and provided to advance and retreat toward the pad plates by braking hydraulic pressure, a seal groove formed to be annularly recessed into an inner surface of the cylinder, and a ring-shaped seal member in close contact with an outer surface of the piston and accommodated in the seal groove, wherein the seal groove includes a bottom surface with which an outer circumferential surface of the seal member is in close contact, a first surface facing a front surface of the seal member, a second surface facing a rear surface of the seal member, and a bent surface in contact with the bottom surface and the second surface and provided in an arc shape.
1 . A caliper brake comprising:
a carrier on which a pair of pad plates are installed to advance and retreat;
a caliper housing slidably installed on the carrier and provided with a cylinder;
a piston installed in the cylinder and provided to advance and retreat toward the pad plates by braking hydraulic pressure;
a seal groove formed to be annularly recessed into an inner surface of the cylinder; and
a ring-shaped seal member in close contact with an outer surface of the piston and accommodated in the seal groove,
wherein the seal groove comprises:
a bottom surface with which an outer circumferential surface of the seal member is in close contact; a first surface facing a front surface of the seal member; a second surface facing a rear surface of the seal member; and a bent surface in contact with the bottom surface and the second surface and provided in an arc shape.
2 . The caliper brake according to claim 1 , wherein
the bottom surface is provided parallel to advancing and retreating directions of the piston.
3 . The caliper brake according to claim 2 , wherein
The first surface has a first inclined surface formed to be inclined toward the pad plate, and
the second surface has a second inclined surface formed to be inclined toward the opposite side of the pad plate.
4 . The caliper brake according to claim 3 , wherein
a depth of the first inclined surface is formed to be about 45% to 55% of a depth of the bottom surface.
5 . The caliper brake according to claim 4 , wherein
a depth of the second inclined surface is formed to be about 25% to 35% of the depth of the bottom surface.
6 . The caliper brake according to claim 1 , wherein
the bent surface has a radius of curvature of 0.7 to 2 mm.