Patent ID: 6405837
Filing Date: 2002-06-18
Classification: F16D

Abstract:
A braking device having service brake and a parking brake, the braking device comprising:a housing including at least a one-piece pressure plate and a cover, the one-piece pressure plate and the cover being arranged in opposition with respect to one another, the one-piece pressure plate defining first and second piston chambers; a shaft that extends at least partially through the housing, the shaft being rotatable relative to the housing about a longitudinal axis; a rotor plate mounted on the shaft, the rotor plate being adapted to rotate in concert with the shaft about the longitudinal axis; a first stator plate positioned between the rotor plate and the one-piece pressure plate; a second stator plate including a plate portion positioned between the cover and the rotor plate; a spring structure mounted between the cover and the second stator plate, the spring structure being arranged and configured to bias the second stator plate against the rotor plate to provide the parking brake; a first piston for releasing the parking brake by forcing the second stator plate away from the rotor plate with sufficient force to overcome the bias of the spring structure, the first piston being mounted within the first piston chamber; and a second piston for actuating the service brake by forcing the first stator plate axially toward the spring structure and against the rotor plate, the second piston being mounted within the second piston chamber.