Patent ID: 7490703
Filing Date: 2009-02-17
Classification: F16D

Abstract:
1. A disc brake actuating apparatus comprising: a caliper; a piston slidably supported by the caliper and containing an adjuster mechanism; and a parking-brake operating mechanism provided at one end portion of the caliper, wherein the parking-brake operating mechanism includes: a second thrust transmitting assembly provided between the cam shaft and the caliper on a side of the cam shaft facing away from a rotor, and wherein the first thrust transmitting assembly includes: a first rolling roller that rolls between the cam shaft and the adjusting spindle, while the first rolling roller rotates about its axis; and first rolling curved surfaces provided respectively at the cam shaft and the adjusting spindle, wherein the first rolling roller is cylindrical, and is disposed in contact with the first rolling curved surfaces, wherein the second thrust transmitting assembly includes: a second rolling roller that rolls between the cam shaft and the caliper, while the second rolling roller rotates about its axis; and second rolling curved surfaces provided respectively at the cam shaft and the caliper, wherein the second rolling roller is cylindrical, and is disposed in contact with the second rolling curved surfaces, wherein the first rolling curved surface on the cam shaft and the second rolling curved surface on the cam shaft are arranged symmetrically with respect to a rotating axis of the cam shaft, wherein a center of curvature of the first rolling curved surface of the cam shaft is spaced a predetermined distance from the rotating axis of the cam shaft, a center of curvature of the second rolling curved surface of the cam shaft is spaced the predetermined distance from the rotating axis of the cam shaft, the center of curvature of the first rolling curved surface is spaced the predetermined distance from the rotating axis in a first direction, and the center of curvature of the second rolling curved surface is spaced the predetermined distance from the rotating axis in a second direction opposite to the first direction.