CPC F16D 65/18 (2013.01) [B60T 8/17613 (2013.01); B60T 13/741 (2013.01); B60T 13/746 (2013.01); B60T 8/1755 (2013.01); F16D 2121/24 (2013.01); F16D 2125/40 (2013.01); F16D 2125/50 (2013.01)] | 23 Claims |
1. An electric brake for a wheel rotor having a brake pad associated therewith, comprising:
a housing defining a passage;
a piston assembly provided in the passage and including a spindle and a piston aligned with the brake pad, the spindle being rotatable to cause the piston to move axially relative to the brake pad; and
a drive assembly comprising:
a motor;
a gear train for transferring torque between the motor and the spindle;
a coupling mechanism coupled to the gear train and having a first condition locking a portion of the gear train against rotation for enabling torque transmission from the motor to the spindle for axially moving the piston to apply braking force to the brake pad, the coupling mechanism having a second condition permitting rotation of the portion of the gear train for disabling torque transmission from the motor to the spindle which permits the piston to retract and reduce the braking force on the brake pad without stopping or reversing the motor.
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