A mechanical actuator for a disc brake is disclosed which provides an improved actuating mechanism which is less expensive and more reliable than prior art mechanical disc brake actuators. The actuator includes a lever which is provided with arcuate camming surfaces on opposite sides thereof. One of the camming surfaces is adapted to rollingly engage a substantially flat insert carried by the caliper housing. The camming surface on the opposite edge of the lever is substantially circular and is defined within a recess on the edge of the lever. Opposite ends of the camming surface terminate in depressions which are adapted to receive a spherical force transmitting element. A force transmitting member slidably mounted within the caliper housing interconnects the force transmitting element with the friction pad of the disc brake. The force transmitting element is disposed in one of the depressions when the brake is released. When a brake application is effected, the lever is rocked about the camming surface engaging the substantially flat insert, and consequently drives the spherical force transmitting element out of its depression, across the camming surface, and towards the other depression. As the spherical force transmitting element is rocked across the camming surface, the force transmitting member is urged toward the brake rotor, consequently forcing the corresponding friction elements into frictional engagement with the rotor to effect a brake application. This is a continuation of U.S. Pat. Application Ser. No. 564,507, filed Apr. 2, 1975, and now abandoned.
A brake application mechanism for a disc brake, particularly a sliding-caliper disc brake having an application shaft which extends parallel to the plane of the brake disc, wherein on the side of the shaft (8) which faces the brake disc (2) the shaft is supported against a thrust piece (9) which is movable against the brake disc (2), support being via a circularly arcuate first contour (17) which is rotatably mounted in a suitable bearing seat (18), and on the side of the shaft which faces away from the brake disc, the shaft is supported against an element with respect to which the thrust piece (9) is movable, support being via a second contour (21) which is eccentric with respect to the first contour. The second contour has at least two circular arcs (I, II) with their centers (P1, P2) and radii (R1, R2) chosen so that when the application shaft is rotated the magnitude of any movement of the thrust piece (9) relative to the application shaft (8) in a direction parallel to the plane of the brake disc is minimized.
A device for actuating a piston located in a cylinder of a disk brake. A push rod translationally secured to the piston is connected to a lever through a ball joint. The lever extend through an elongated opening in an end member secured to the cylinder. The end member has an inclined plane which forms a cam surface with respect to an axial plane of the cylinder. A roller member attached to the lever engages the inclined plane at a single point of engagement. An input force applied to the lever causes the roller member to move on the inclined plane and impart pure axial translational movement to the push rod to correspondingly move the piston within the cylinder and correspondingly effect an actuation of the disk brake.
A mechanical actuator for a disc brake assembly comprises a cam shaft and a pair of toggles. The cam shaft is designed with different interfaces for the pair of toggles to minimize travel for the cam shaft and maximize clamping forces during a parking brake application for the disc brake assembly.
A force generating system including a lever mechanism fixed with respect to and interacting with a varying elastic deformation force take-up system and at a force application point of a given lever arm length; an energy-storing force generating device which acts upon the lever mechanism at a changeable position of its lever arm for supplying a portion of the energy stored in it when the lever arm length is increased and for at least partially taking up again the energy taken up by the force take-up system, when the lever arm length is decreased; and an adjusting arrangement for the controllable changing of the position in which the force generating device acts upon the lever arm of the lever mechanism. The force generating system is used in a disk brake system.
A parking-brake operating mechanism is provided with an adjusting spindle, a cam shaft to which a parking lever is connected, and a thrust transmitting assembly disposed between the cam shaft and the adjusting spindle. The thrust transmitting assembly includes a rolling roller which can roll between the cam shaft and the adjusting spindle. Rolling curved surfaces are provided respectively at the cam shaft and the adjusting spindle. The rolling roller is disposed in contact with the rolling curved surfaces.
