Patent ID: 7926625
Filing Date: 2011-04-19
Classification: F16D

Abstract:
1. A disk braking device comprising: a disk plate fixed to a wheel; a pad unit arranged to generate a frictional force between the pad unit and the disk plate, the pad unit including at least a first pad unit portion and a second pad unit portion; a piston mechanism arranged to move the pad unit into pressure contact with the disk plate, the piston mechanism including at least a first piston portion including at least one piston and a second piston portion including at least one piston, and all of the pistons have a same cylinder area; and a caliper body arranged to hold the piston mechanism; wherein each of the first and second pad unit portions includes: the first pad unit portion has a total friction member area corresponding to a total cylinder area of the first piston portion, and the second pad unit portion has a total friction member area corresponding to a total cylinder area of the second piston portion; the first piston portion includes fewer pistons than the second piston portion such that the total cylinder area of the first piston portion is less than the total cylinder area of the second piston portion, and the total friction member area of the first pad unit portion is less than the total friction member area of the second pad unit portion; and the single base plate of the first pad unit portion is not connected to the single base plate of the second pad unit portion such that the single base plate of the first pad unit portion acts independently of the single base plate of the second pad unit portion.