Disc brake with variable width caliper and powered actuation

摘要

The disc brake with variable width caliper and powered actuation comprises first and second bridge members (14, 15) connected to two movable members (20, 30) extending over the periphery of the rotor (51). An inboard end of each movable member includes threads having threadably mounted thereon a nut (28, 29). The nut has ratchet teeth on one axial end which engage ratchet teeth (10A, 11A) of an associated actuator sleeve (10, 11) disposed slidably about the movable member. Each sleeve includes gear teeth (10C, 11C) about its circumference. The second bridge member is mounted slidably upon the movable members. The teeth of the sleeves are engaged by a rack member (110). A piston (117) includes an arm (125) connecting the piston with a rack (130) of the rack member so that hydraulic pressure effect displacement of the piston and a lateral displacement of the rack. The lateral movement of the rack thereby effects rotation of the sleeves which, through the engaged ratchet teeth (10A, 11A) causes the nuts to rotate and effect translational movement of the movable members. The nuts (28, 29) translate along the movable members, displace the second bridge member and a friction lining mechanism (16) against the rotor, and by reaction, the movable members bring a friction lining of the first bridge member into engagement with the other face of the rotor.