| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To keep high braking feeling by reducing the variation in displacement of a piston in releasing braking. <P>SOLUTION: This disk brake device comprises a caliper 21, the pistons 22a, 22b and piston ring 23a, 23b. The caliper 21 is mounted on a front fork and placed to hold a disc rotor, and has a cylinder part having seal grooves 31a, 31b on its inner peripheral face. The piston is at least one member mounted on a cylinder part in a state of being advanced and retracted, and moved in the braking direction by oil pressure to hold the disc rotor. The piston rings are mounted in the seal grooves for sealing a clearance between the cylinder part and the piston, and move the pistons in the braking releasing direction by elastic restoring force. The seal grooves of the cylinder part respectively have movement control parts 35a, 35b for controlling the movement of the piston rings when the pistons are moved in the braking direction, and movement permitting parts 37a, 37b recessed with steps 36a, 36b to the movement control part and permitting the movement of the piston rings, on their side face in the braking direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
