YW SERIES ELECTRO-HYDRAULIC THRUSTER BRAKE

Assembly:

A thruster shoe brake has a pair of cast iron shoes which are lined up with friction pads. The shoe are on main arm side arm of the brake, each of them have a hinge pin fi tted in the base. They are connected to each other on top by a tie rod, which is hinged in the main arm and locked to the swivel block in the side arm, by a lock nut.

A crank lever is hinged on the main arm and the other end is fi xed to the top clevis of the thruster by a hinge pin. A brake spring is fi xed on the main arm and is pre-loaded by a locknut on the lever. The pre-tension in this spring decides the braking torque. The thruster is fi tted on the base by a hinge pin. When the thruster is not energized, the brake shoes are pressed on the brake drum fi tted 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.

As the piston travels upwards the angle lever turns, pushes the brake rod and compresses the brake spring. Simultaneously, the brake lever on the other side of the wheel (Brake Drum) is retracted. When the fi rst lever reaches the stop on the brake base member the brake lever at the thruster begins to move, releasing the brake drum.

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