It is a kind of hydraulic element which provides pressurized liquid for hydraulic transmission, and is a kind of pump. Its function is to convert mechanical energy (such as electric motors and internal combustion engines) into liquid pressure energy. The working principle of the single plunger pump is shown in the figure. The cam is driven by an electric motor. When the cam pushes the plunger upward, the sealing volume of the plunger and cylinder is reduced, the oil is extruded from the sealing volume, and the check valve is discharged to the desired place. When the cam rotates to the descending part of the curve, the spring forces the plunger downward, forming a certain degree of vacuum, and the oil in the tank enters the seal volume under the action of atmospheric pressure. The cam causes the plunger to continuously rise and fall, the seal volume decreases and increases periodically, and the pump continues to suck oil and drain oil.
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