Patent ID: 7458442
Filing Date: 2008-12-02
Classification: F16D

Abstract:
1. In an electromagnetic braking system comprising a brake stack, a ram shiftable in a first linear direction toward and against the brake stack and a second liner direction opposite the first linear direction, and a motor having an output shaft mechanically connected to the ram and rotatable in a first rotation direction for moving the ram in the first linear direction and in a second rotation direction for moving the ram in the second linear direction, a method for performing a park brake operation with the electromagnetic braking system and limiting the force exerted by a cooling brake stack on the motor comprising the steps of: providing at least one friction member having a friction surface adjacent to the motor output shaft; moving the at least one friction surface against the motor output shaft in a non-locking manner; and holding the at least one friction surface against the output shaft with a predetermined force to perform the park brake operation; whereby the predetermined force is low enough to allow the motor output shaft to slip relative to the friction surface when a force on the output shaft exceeds a predetermined level, so that