PARKING BRAKE DEVICE OF DISK BRAKE
Disclosed is a parking brake device of a disk brake. The parking brake device includes a caliper housing including a finger unit and a body part to push pad plates, which are installed at both sides of a disk, to closely make contact with the disk, a cylinder provided in the body part of the caliper housing, a piston slidably provided in the cylinder to move the pad plates toward the disk by using driving force generated from hydraulic pressure or mechanical thrust force, a cam unit provided at a rear portion of the cylinder to transform rotation motion of a parking brake lever into linear motion of the piston, and including an operating shaft, a ramp, and a ball, and a push rod which delivers linear motion of the cam unit into the piston. A flange part of the push rod is coupled to an open front end of the ramp having a cylindrical shape by using grooves or protrusions, so that the push rod is easily prevented from rotating.
1 . A parking brake device of a disk brake, the parking brake device comprising:
a caliper housing including a finger unit and a body part to push pad plates, which are installed at both sides of a disk, to closely make contact with the disk;
a cylinder provided in the body part of the caliper housing;
a piston slidably provided in the cylinder to move the pad plates toward the disk by using driving force generated from hydraulic pressure or mechanical thrust force;
a cam unit provided at a rear portion of the cylinder to transform rotation motion of a parking brake lever into linear motion of the piston, and including an operating shaft, a ramp, and a ball; and
a push rod which delivers linear motion of the cam unit into the piston,
wherein the push rod is coupled with the ramp such that the push rod is prevented from rotating.
2 . The parking brake device of claim 1 , wherein the push rod comprises a body part and a flange part, the flange part is provided with at least one groove or protrusion, and the ramp is provided with at least one restriction protrusion or restriction groove coupled with the at least one groove or protrusion of the flange part, respectively.
3 . The parking brake device of claim 1 , wherein the ramp has a cylindrical shape, and has a rear surface detachable from a body of the ramp.