制动器是具有使运动部件（或运动机械）减速、停止或保持停止状态等功能的装置。是使机械中的运动件停止或减速的机械零件。俗称刹车、闸。制动器主要由制架、制动件和操纵装置等组成。有些制动器还装有制动件间隙的自动调整装置。为了减小制动力矩和结构尺寸，制动器通常装在设备的高速轴上，但对安全性要求较高的大型设备（如矿井提升机、电梯等）则应装在靠近设备工作部分的低速轴上。The brake is a device that has the functions of slowing down, stopping or maintaining the stop state of moving parts (or moving machinery). It is a mechanical part that stops or decelerates the moving parts in the machine. Commonly known as brake and brake. The brake is mainly composed of brake frame, brake parts and control devices. Some brakes are also equipped with automatic adjustment device for brake part clearance. In order to reduce the braking torque and structural size, the brake is usually installed on the high-speed shaft of the equipment, but large equipment with high safety requirements (such as mine hoist, elevator, etc.) should be installed on the low-speed shaft near the working part of the equipment.