Disc Spring Washer

Thruster brake has a pairot cast iron shoes which are lined up with friction pads. Ihe shoes are hinged on main arm and side ami of the brake. Each of ihem have a hinge pin fitted in the base. They an* connected to each other on top hyalie rod, which is hinged In the main ami and locked to Ihe swivel block in the side arm, by a lock nut.

A crank lever is hinged on the main arm, and ihe other end is fixed In the top clevis of the thruster by a hinge pin. A brake spring. Is fixed on the main arm and is pre-loaded by a locknut on the lever, prehension in Ihjs spring dec ides the breaking torque. The thruster is filled on Ihe base by a hinge pin. When the thruster is nol energi/ed, the brake shoes are pressed on Ihe brake drum fitted on the drive motor shaft and hold it under the effect of braking force provided by the spring. In such condition, the brake is applied, and the drum cannot rotate. When the thruster motor is energized, ihe thrust provided by the thruster lifts up ihe crank lever which move ihe arms and the shoes away trom the brake drum, there by releasing the braking force.