Actuating mechanism for a sliding-caliper disc brake

An actuating mechanism for a sliding-caliper disc brake having a brake disc, a caliper, an application shaft connected to a brake lever, said shaft being disposed between one side of the brake disc and a part of the caliper, said application shaft having an axis extending transversely to a rotation axis of the brake disc, wherein an approximately semicylindrical first region of said application shaft is supported against said part of the caliper by a first partial rolling bearing for rotation with respect to said part of the caliper produced by swinging the brake lever, further wherein said application shaft has a projection directed toward the brake disc substantially opposite said first semicylindrical region which projection cooperates, through a rolling element and a second partial rolling bearing, with a thrust piece for applying force to the brake disc, said projection having a profile in the form of an involute with a varying swing radius which increases in a brake applying direction, further wherein the axis of the application shaft is displaced with respect to a center plane of the thrust piece such that a line of contact of said projection with said rolling element lies constantly in said center plane as the application shaft is rotated to engage and disengage the brake, further wherein the rolling element has a radius of curvature greater than the largest effective radius of said projection, and still further wherein an interlocking linkage is provided between said rolling element and said projection.