| 摘要 |
A disc brake comprising a caliper configured to straddle a rotor and retain first and second brake pads in at least an inboard-outboard direction, a piston (15) slidable within the caliper, for applying a force to the first brake pad (12) to move it towards the rotor during a brake operation, the piston comprising an inner portion (15b) restrained from rotating and a rotatable outer portion (15a), the inner and outer portions being in threaded engagement, such that rotation of the outer portion of the piston causes the inner portion of the piston to move axially relative to the outer portion of the piston, an operating shaft (21) for applying an actuating force to advance the piston when the operating shaft is actuated, a wear adjustment mechanism (30) for adjusting the clearance between the inboard brake pad and the rotor, to account for wear of the brake pads and rotor, and a transmission path of the wear adjustment mechanism, from the operating shaft to the outer piston, wherein the transmission path comprises a one-way clutch (44) that directly engages the outer portion (15a) of the piston, such that when adjustment of the clearance is required, applying the operating shaft causes the one-way clutch (44) to engage the outer portion of the piston and cause the outer portion of the piston to rotate, and the inner portion to advance in the direction of the rotor. |
