Mechanical brake is composed of brake cylinder, friction plate, separation plate and brake spring. The internal spline of the friction plate is sheathed on the external spline of the cylinder body, and is relatively fixed with the cylinder body, and the teeth of the separation plate are embedded in the tooth groove of the shell. The friction plate and separation plate are alternately stacked together, and the pre compressed spring force of the brake spring is pressed on the housing through the brake cylinder. Friction is produced between the friction plate and the shell, the separator plate and the brake cylinder. Depending on the friction, the drive shaft is limited to ensure long-term and reliable braking when parking.
Mechanical brake is generally spring force on brake, hydraulic release brake. In order to prevent the mechanical brake spring from braking too hard and reduce the impact between the ring gear and gears during braking, it is required that the mechanical brake will not start to work until the hydraulic motor is braked, and the delay time is about a few seconds. Therefore, the requirement for the mechanical brake is to release the brake quickly, so that the system can be put into operation quickly and reduce the energy loss of the hydraulic system. When braking, the hydraulic cylinder of the brake is required to delay the return oil when the spring is on the brake, so as to delay the combination of the mechanical brake.
There are three ways to control the delayed return oil of brake hydraulic cylinder: hydraulic control, electric control and microcomputer control. Among them, the hydraulic control is divided into two parts: the brake hydraulic cylinder returns oil through the throttle hole to play a damping role and the flow valve to return oil, so as to keep the return oil of the brake hydraulic cylinder in a small range of stable flow value.
