【正文】
. At present all kinds of cars used by the brake drum brakes and can be divided into two major categories of disc brakes. Drum brake friction in the rotating ponents of the brake drum, and its work surface for the cylindrical surface of the rotating disc brake ponents for the brake disc, to end the work surface. In addition, under the rotating ponents of the installation of different positions, the brakes can be divided into the wheel brakes and brake two categories. Among them, the rotating wheels, brake ponents installed in the solidwheel or axle, brake torque that is a direct role in both sides of the wheels, respectively, for its general travel brake, and can also be used to brake the second and the car braking。鼓式制動(dòng)器的摩擦副中的旋轉(zhuǎn)元件為制動(dòng)鼓,其工作表面為圓柱面;盤式制動(dòng)器的旋轉(zhuǎn)元件為制動(dòng)盤,以端面為工作表面