Power hydraulic propeller working principle, the power hydraulic propeller consists of two parts, driving motor and body (centrifugal pump), the body part is composed of cover, cylinder, piston, impeller and turn. When electrifying, the motor drives the rotating shaft and the impeller on the rotating shaft and produces pressure in the piston. Under the influence of the pressure, the oil is sucked from the upper part of the piston to the lower part of the piston, forcing the piston and the push rod and beam fixed on it to rise rapidly. Mechanical load is generated by lever mechanical compression of load springs (propeller or brake with load springs). When the power is broken, the impeller stops spinning, and the piston is rapidly falling down under the load spring force and its own gravity, forcing the oil to reflow into the upper part of the piston, and it is still in place through the lever mechanism. Electric hydraulic propeller is often used in conjunction with brake rack, and is widely used in braking of various transmission devices.