Structural characteristics of the oil pump

Structure
Simple structure, small size, light weight, and large oil delivery capacity. The cycloidal rotor pump uses an internal and external rotor meshing structure, with few teeth and compact dimensions. It can form a sealed chamber without relying on other isolation elements, and has a small number of parts.
Motion Characteristics
Smooth operation and low noise. The internal and external rotors of the cycloidal rotor pump differ by only one tooth. When they move relative to each other, the sliding speed of the tooth surfaces is low, and the meshing point continuously moves along the tooth profiles of the internal and external rotors, resulting in minimal mutual wear of the rotor tooth surfaces. Due to the large envelope angle of the suction and discharge chambers, close to 145°, both suction and discharge times are sufficient, making the oil flow relatively smooth and the motion stable, with noise significantly lower than that of gear pumps.
High-Speed Characteristics
Good high-speed characteristics. For general involute gear pumps, if the speed is too high, centrifugal force will cause insufficient oil filling in the tooth valleys, creating "cavitation" and reducing pump efficiency. Therefore, their speed rarely exceeds 3000 rpm, with a peripheral speed within 5 to 6 m/s. For cycloidal rotor pumps, the suction and discharge angle range is large, and at high rotational speeds, centrifugal force helps fill the oil in the tooth valleys, preventing harmful "cavitation." Thus, the speed range of cycloidal rotor pumps can be from several hundred to nearly ten thousand rpm.