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The brake assembly contains of a brake arm, brake shoe, base frame, actuating lever, brake spring and an electro hydraulic thruster. The brake shoe is mounted on the brake arm and the gap between the brake drum and brake pad is adjusted by spring mechanism. A heavy spring suitable to give required braking force, is mounted in a square tube and a graduation scale is provided outside to note the spring force .The spring force can be adjusted suitably by tightening the nut at the bottom of the spring, All the components are mounted on the base frame

This brake is normally in closed condition due to the spring force. The hydraulic thruster is actuated by an electric motor. When the power supply is on, the thruster motor is switched on and hydraulic pressure is developed in the hydraulic thruster. The piston is actuated instantaneously and the brake is released. When the power is cut off, the thruster motor stops thus releasing the hydraulic pressure. The thruster piston is pushed back and the brake pads clamp on to the brake drum. Due to the spring force, brake is applied.

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ADRUM SIZE
[mm]
THRUSTER SIZETORQUE µ=0.4 [N-m]
100K-HT 23/5 K-HT 30/520-50 20-60
160K-HT 23/5 K-HT 30/540-90 40-100
200K-HT 23/5 K-HT 30/540 - 400 50 - 420
250K-HT 23/5 K-HT 30/5 K-HT 50/640 - 230 50 - 425 120 - 800
315K-HT 30/5 K-HT 50/6 K-HT 80/680 - 525 120 - 940 120 - 1610
400K-HT 30/5 K-HT 50/6 K-HT 80/6 K-HT 121/680 - 525 200 - 940 120 - 1610 170 - 2580
500K-HT 50/6 K-HT 80/6 K-HT 121/6 K-HT 201/6250 - 1250 250 - 2080 250 - 3200 300 - 3800
630K-HT 121/6 K-HT 201/6 K-HT 301/6350 - 3200 350 - 5000 350 - 7600
710K-HT 121/6 K-HT 201/6 K-HT 301/6450 - 3600 450 - 5600 450 - 8600