Patent ID: 8397881

Claim:
A parking brake apparatus, comprising: a parking brake actuator that has a housing that is fixed to a transmission case and a piston including a piston rod, wherein the piston is mounted in the housing to reciprocate along the housing; a lever pivotally coupled to the transmission case, wherein one end portion of the lever is pivotally connected to the piston rod; a sprag rod that is pivotally connected to the other end portion of the lever; and an operational elastic member that is disposed around a rotary shaft of the lever and elastically supports the lever in one rotational direction against the transmission case, wherein the rotary shaft is rotatably coupled to the transmission case; wherein the parking brake actuator has a hydraulic chamber enclosed by the housing and the piston and moves the piston to unlock a parking gear by using hydraulic pressure supplied to the hydraulic chamber and the housing has a release port to selectively supply the hydraulic pressure to the hydraulic chamber, the housing of the parking brake actuator is fixed to a valve body of the transmission case to be fixed with respect to the transmission housing, and the operational elastic member is configured to provide elastic force to the lever to move the piston of the parking brake actuator to lock the parking gear when the hydraulic pressure in the hydraulic chamber is removed.