The rotation of the input shaft drives the pump bladder to rotate, and the pump bladder rotates with the plunger. Since the swash plate does not rotate, and forms an inclined surface in contact with the sliding shoe of the plunger, the plunger will perform a reciproing piston movement in the pump bladder (like The pump is the same, I don’t know if you can imagine it) Start to absorb oil at the end of the sliding shoe from the pump (the pump is pressed to the bottom and then lift up to start pumping) The sliding shoe is farthest from the pump and starts to discharge oil (the pump is Pull to the top and press down to start exhaust), the valve plate determines the oil inlet and outlet (for example, the inhalation of the pump is from the upper end of the pump, and the exhaust naturally comes out of the pipe), the control mechanism controls the slope Disk angle (the larger the swash plate angle, the more oil it can absorb, just like a pump, the higher you lift it, the greater its air output will be. On the contrary, if you only lift a little, its air output will definitely be smaller)