Zf Active Safety US Inc.

Aaron Wahlfors

Kraig Eric Gerber

An electrically actuated parking brake has a single electric motor producing a torque, a first torque limiting device with a first spring force, and a second torque limiting device with a second spring force. The first torque limiting device fully transmits a first portion of the torque to a first spindle until a first clamp force overcomes the first spring force and the second torque limiting device fully transmits a second portion of the torque to a second spindle until a second clamp force overcomes the second spring force. When the first clamp force overcomes the first spring force and the second spring force overcomes the second clamp force, the first portion of the torque that exceeds the first spring force is transmitted to the second spindle by the second torque limiting device.

Electric parking brake having a gearing with a torque limiting device

An electric parking brake for a vehicle brake system includes a caliper, a piston, a spindle, an adjuster nut, a ring-like member affixed to the piston, and a biasing member. The piston may be disposed within a cavity of the caliper. The spindle is configured to drive the axial movement of the adjuster nut between a retracted position and an extended position via a threaded engagement wherein the adjuster nut is disposed within the piston. The biasing member may be disposed between the ring-like member and the adjuster nut so that, as the adjuster nut moves from an extended position to a retracted position which corresponds to a control signal, the biasing member urges the piston away from the rotor.

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Hartland, MI, United States of America

Aaron Wahlfors