ELECTRIC PARKING BRAKE MOTOR GEAR UNIT [(E)]

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Without Mazda M Hybrid System

Purpose/function

•  The electric parking brake motor unit operates the built-in motor to press out the disc pads using the torque increased by the gear reduction to maintain the rear disc plate in a clamped condition. When the electric parking brake is released, the motor rotates in the opposite direction.

Construction

•  The electric parking brake motor gear unit is located on the rear brake caliper.

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•  The electric parking brake motor gear unit is built into the motor and the planetary gear.

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Operation

When operating electric parking brake

1.  When motor operation current flows from the DSC HU/CM, the electric parking brake motor gear unit operates the built-in motor.

2.  The motor speed/torque is transmitted to the spindle by decelerating the speed using the built-in 2 stage worm gear and increasing the torque.

3.  When the spindle bolt rotates, the spindle nut moves to the brake piston side and it contacts the brake piston.

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4.  The contacted spindle nut moves the brake piston to the disc pad side and the brake piston is pressed against the disc pad.

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5.  The disc pads are pressed against the rear disc plate and the rear disc plate is held engaged.

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When releasing electric parking brake

1.  When motor operation current flows from the DSC HU/CM, the electric parking brake motor gear unit operates the built-in motor.

2.  The motor rotates in the opposite direction of the electric parking brake operation.

3.  The motor speed/torque is transmitted to the spindle by decelerating the speed using the built-in 2 stage worm gear and increasing the torque.

4.  When the spindle bolt rotates, the spindle nut moves to the motor side and separates from the brake piston.

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5.  The brake piston separates from the disc pad by the piston seal force to release the engaged the rear disc plate.

am3zzn00008334

With Mazda M Hybrid System

Purpose/Function

•  The electric parking brake motor unit operates the built-in motor to press out the disc pads using the torque increased by the gear reduction to maintain the rear disc plate in a clamped condition. When the electric parking brake is released, the motor rotates in the opposite direction.

Construction

•  The electric parking brake motor gear unit is located on the rear brake caliper.

am3zzn00007918

•  The electric parking brake motor gear unit is built into the motor and the planetary gear.

am3zzn00008329

Operation

When operating electric parking brake

•  When motor operation current flows from the electronically controlled brake unit, the electric parking brake motor gear unit operates the built-in motor.

•  The motor speed/torque is transmitted to the spindle by decelerating the speed using the built-in 2 stage worm gear and increasing the torque.

•  When the spindle bolt rotates, the spindle nut moves to the brake piston side and it contacts the brake piston.

am3zzn00008330

•  The contacted spindle nut moves the brake piston to the disc pad side and the brake piston is pressed against the disc pad.

am3zzn00008331

•  The disc pads are pressed against the rear disc plate and the rear disc plate is held engaged.

am3zzn00008332

When releasing electric parking brake

•  When motor operation current flows from the electronically controlled brake unit, the electric parking brake motor gear unit operates the built-in motor.

•  The motor rotates in the opposite direction of the electric parking brake operation.

•  The motor speed/torque is transmitted to the spindle by decelerating the speed using the built-in 2 stage worm gear and increasing the torque.

•  When the spindle bolt rotates, the spindle nut moves to the motor side and separates from the brake piston.

am3zzn00008333

•  The brake piston separates from the disc pad by the piston seal force to release the engaged the rear disc plate.

am3zzn00008334