Fabryka Elementów Napędowych FENA Sp. z o.o.

Shoe drum brakes are adjusted to co-operate with brake drums on their external surface. The brakes can be equipped with electrohydraulic thrustors (AHH,AHG,AHC,AHT brakes), electromagnetic thrustors (AHM brakes) or electric drives (AHN brakes).

AHH and AHG SHOE BRAKES WITH ELECTROHYDRAULIC THRUSTOR

The braking torque is created by the spring inbuilt in the thrustor body, which through the compound lever causes the brake shoes with friction lining to press to the friction surface of the brake drum. Turning the voltage supplying the thrustor on starts the motor and the pump forcing the oil under the piston of the thrustor, which causes the piston to move up and releases the brake. Turning off the power supply causes the piston to move down (under the influence of the inbuilt spring) and the brake is applied. The value of the braking torque can be adjusted through the change of the brake position on appropriate lever.

AHG brake is equipped with an anti-explosion thrustor, intended for operation in explosion hazard areas.

AHT HOLDING BRAKES

The braking torque is created through the thrust force of the thrustor's piston. Turning the voltage supplying the thrustor on starts the motor and the pump forcing the oil under the piston of the thrustor, what makes the piston move up and through the compound lever causes the brake shoes with friction lining to press to the friction surface of the brake drum. Turning off the supply causes the piston to move down (under the influence of the spring) and releases the brake. The value of the braking torque can be adjusted through the change of the brake position on appropriate lever.

AHC LOAD BRAKES

The baking torque is created through gravitational force of weights placed on the lever, which causes the brake shoes with friction lining to press to the friction surface of the brake drum. Turning the voltage supplying the thrustor on starts the motor and the pump forcing the oil under the piston of the thrustor, what causes the piston to move up and releases the brake. Turning off the power supply causes the piston to move down (under the influence of the weights) and the brake is applied. The value of the braking torque can be adjusted through the change in the number of weights placed on the lever.

AHM SHOE BRAKES WITH ELECTROMAGNETIC THRUSTOR

The braking torque is created by the spring inbuilt in the compound lever, which causes the brake shoes with friction lining to press to the friction surface of the brake drum. Turning the voltage supplying the thrustor on starts the electromagnet and causes the piston to move up and releases the brake. Turning off the supply causes the piston to move down (under the influence of the spring) and the brake is applied. The value of the braking torque can be adjusted through the change in the deflection of the spring.

AHM brake can be also equipped with a fireproof thrustor intended for operation in explosion hazard areas.

AHN BRAKES WITH ELECTRIC DRIVE

The braking torque is created by the thrust force of the electric drive's piston. The movement of the piston causing the shoe to clamp or release the brake drum takes place only when the voltage supply is provided to the brake drive. At the end of the cycle of applying or releasing the brake, the power supply is turned off and the brake remains in this state until the next turning the voltage on in order to change this state. There is no automatic return of the piston when the voltage supply is turned off. In case of no voltage supply there is a possibility of manually applying or releasing the brake with the use of a crank.

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