In this case, the actuator can automatically repeat the change rule of the input signal. At the same time, it can also play the role of power amplification to achieve the purpose of follow-up control. The slide valve type hydraulic servo system can be divided into slide valve type and rotary type, and the slide valve type hydraulic servo system can be divided into external type and internal type. The hydraulic servo system slide valve is used in the steering mechanism. When the oil moves to the right, it flows into the large chamber of the steering cylinder, pushing the piston to move to the right, causing the steering wheel to deflect. At this time, the oil in the steering cylinder cavity flows into the feedback cylinder cavity to achieve feedback connection; On the contrary, when the slide valve moves to the left, the pressure oil flows into the small chamber of the feedback cylinder, and its piston discharges the oil in the large chamber to the small chamber of the cylinder, so that the small chamber of the steering cylinder deflects in the opposite direction. To avoid suction, the differential check valve at the end of the piston stroke of each side of the steering cylinder replenishes oil to the small cavities of the steering cylinder and the feedback cylinder. The function of the hydraulic servo system of the slide valve brake is to operate the lever through the spring when stepping on the pedal, so that the left end of the lever presses the spring upward, so that the piston moves upward, and the conical valve is pushed open, so that the oil inlet is connected with the oil chamber. At this time, the high-pressure oil enters the working cylinder through the oil inlet, conical valve and oil outlet for braking. When the pressure generated by the high-pressure oil acting on the piston is much greater than the torque generated by the pin, the piston will move downward and the conical valve will close. If the torque of the former is still higher than that of the latter, the piston will move down again, the conical valve will be separated from the valve seat, and the oil chamber is connected with the oil return port. At this time, part of the oil in the brake system flows back to the oil tank, and the piston returns to normal until the cone valve is closed. When the brake pedal is released, the piston drops, the oil flows from the oil chamber to the oil return port through the oil passage and oil hole, and then returns from the oil tank. At this time, the brake is released. In this case, the actuator can automatically repeat the change rule of the input signal, and at the same time, it can also play the role of power amplification, Cycloidal hydraulic motor of pump truck So as to achieve the purpose of follow-up control. The slide valve type hydraulic servo system can be divided into slide valve type and rotary type, and the slide valve type hydraulic servo system can be divided into external type and internal type. The hydraulic servo system slide valve is used in the steering mechanism. When the oil moves to the right, it flows into the large chamber of the steering cylinder, pushing the piston to move to the right, causing the steering wheel to deflect. At this time, the oil in the steering cylinder cavity flows into the feedback cylinder cavity to achieve feedback connection; Conversely, when the slide valve moves to the left, the pressure oil flows into the small chamber of the feedback cylinder, and the piston discharges the oil in the large chamber, Hydraulic cycloid motor stator Discharge to the cylinder cavity to deflect the steering cylinder cavity in the opposite direction. To avoid suction, the differential check valve at the end of the piston stroke of each side of the steering cylinder replenishes oil to the small cavities of the steering cylinder and the feedback cylinder. The hydraulic servo system of the slide valve brake is used to operate the lever through the spring when stepping on the pedal, so that the left end of the lever presses the spring upward, Bm5 cycloidal hydraulic motor Move the piston upward, push open the conical valve, and connect the oil inlet with the oil chamber. At this time, the high-pressure oil enters the working cylinder through the oil inlet, conical valve and oil outlet for braking. When the pressure generated by the high-pressure oil acting on the piston is much greater than the torque generated by the pin, the piston will move downward and the conical valve will close. If the torque of the former is still higher than that of the latter, the piston will move down again, the conical valve will be separated from the valve seat, and the oil chamber is connected with the oil return port. At this time, part of the oil in the brake system flows back to the oil tank, and the piston returns to normal until the cone valve is closed. When the brake pedal is released, the piston drops, the oil flows from the oil chamber to the oil return port through the oil passage and oil hole, and then returns from the oil tank. At this time, the brake is released.