Patent ID: 7753178
Filing Date: 2010-07-13
Classification: F16D

Abstract:
1. A disk brake with a parking brake mechanism comprising: a pair of pads disposed on opposite sides of a disk; a caliper in which a piston is slidably provided in a cylinder, such that a hydraulic pressure, when introduced into the cylinder, thrusts the piston to cause the pair of pads to press against the disk, thereby exerting a braking force; and a parking brake mechanism driven by an electric motor when the hydraulic pressure is introduced into the cylinder to press the pads against the disk, and adapted to mechanically hold the piston in a braking position even after the hydraulic pressure is no longer applied to the cylinder, wherein, when the electric motor is in a rotational position for parking brake release, the piston uses a first pressure receiving area to receive a hydraulic pressure applied to the cylinder and presses the pads, and when the electric motor is in a rotational position for parking brake operation, the piston uses a second pressure receiving area to receive the hydraulic pressure applied to the cylinder and presses the pads, the second pressure receiving area being larger than the first pressure receiving area.