Explain in detail driving brakes

     drum lifter is an intermittent motion mechanism, it's work is characterized by frequent starting and braking, therefore brake work in Jinan traffic in both devices is the role of the safety device has three brakes: Support, Stop, drop weight.
     Typical driving braking device consists of the bottom plate, brake drum, brake shoes, wheel cylinders, a return spring, the positioning pins and other component parts. Plate mounted in a fixed position on the axle, which is stationary, the above equipped with brake shoes, wheel cylinders, a return spring, the positioning pin, receiving a rotational torque braking. each drum has a pair of brake shoes, with a friction lining on the brake shoes brake drum is mounted on a hub on the wheel is rotated together with the components, which is made of a certain amount of iron, shaped like a drum circle. when braking, the wheel cylinder piston driven compression brake drum brake shoes, brake drum by friction reducer, forcing the wheels stop turning.
     On the brake drum, usually only one wheel cylinder, brake master cylinder from the wheel cylinder by hydraulic, the wheel cylinder to the left and right ends of simultaneously top end of the piston brake shoe hoof, force equal, but because the wheel is rotating, brake drum brake shoe pressure acting on the left-right asymmetry, resulting in their own self-energizing or minus force. Therefore, the industry side of the self-energizing brake shoe called the leading shoe, cut themselves side of the force from the brake shoe called hoof, hoof collar friction torque is 2 to 2.5 times from the hoof, the two brake shoe friction linings wear are not the same.