Principle：Two intermeshing gears create vacuum to suck oil and extrude oil via meshing. Classified into external and internal meshing types.
Features：Simple structure, good contamination resistance; low-medium pressure, obvious flow pulsation.
Applications：Agricultural machinery, small construction machinery, lubrication/cooling systems.
Principle：Rotor drives vanes to cling to stator inner wall, oil suction/discharge via chamber expansion/contraction. Classified into single/double-acting types.
Features：Stable operation, low noise, uniform flow; medium pressure, relatively high requirement for oil cleanliness.
Applications：Injection molding machines, forklifts, medium-pressure hydraulic systems of machine tools.
Principle：Piston reciprocation changes chamber volume for oil suction/discharge. Classified into axial/radial piston types.
Features：High pressure and heavy load, high efficiency and precision; complex structure, strict requirement for oil cleanliness.
Applications：Mining machinery, large construction machinery, high-pressure systems in aerospace.
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