| CPC F16D 55/226 (2013.01) [F16D 65/183 (2013.01); F16D 2055/0016 (2013.01); F16D 2121/04 (2013.01); F16D 2125/08 (2013.01)] | 15 Claims |
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1. A caliper brake, comprising:
a carrier in which a pair of pad plates are installed to move forward and backward toward a disk;
a caliper housing slidably installed on the carrier and provided with a cylinder;
a piston installed in the cylinder and configured to move forward and backward toward the pair of pad plates by a braking hydraulic pressure;
a seal groove formed to be recessed in an annular shape on an inner surface of the cylinder; and
a seal member accommodated in the seal groove, the seal member including a front surface located in a forward direction of the piston, a rear face located in a backward direction of the piston, an inner circumferential surface in close contact with an outer circumferential surface of the piston, and an outer circumferential surface in close contact with a seating surface of the seal groove;
wherein the front surface is provided with a protrusion from which at least a part thereof protrudes,
wherein the seal groove is divided into a first space formed below the protrusion, a second space formed above the protrusion, and
wherein the second space is formed with a smaller volume than the first space, the second space is filled before the first space by elastic deformation of the seal member when the piston moves forward,
wherein the seal groove comprises the seating surface on which the outer circumferential surface of the seal member is seated, a front braking surface facing the front surface of the seal member, and a front inclined surface inclined from the front braking surface in the forward direction of the piston,
wherein at least a part of the protrusion is provided in close contact with both the front braking surface and the front inclined surface of the seal groove when the piston moves forward.
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