Importance

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Abstract

A parking brake assembly includes a brake mechanism, a coupling mechanism and an apply mechanism. The brake mechanism includes a piston that clamps brake pads against a rotor. The coupling mechanism couples the apply mechanism to the brake mechanism. The coupling mechanism includes a first member having a first end and a second end. The first end is configured to engage the piston. The second end includes a pocket. The coupling mechanism includes a second member having a first end and a second end. The first end of the second member defines a roller surface. The roller surface has a ramp portion. The coupling mechanism includes a rolling member held by the pocket and disposed between the pocket and the roller surface. The rolling member travels along the roller surface when the first member moves a first distance increment along a first axis and the second member moves a second distance increment along a second axis. The first and second axes are not collinear and a ratio based on the first distance increment and the second distance increment varies based on a position of the rolling member along the roller surface.

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First Claim