Internal gear pump has two kinds of tooth profile namely: involute profile and cycloidaltooth profile.
内啮合齿轮泵有两种齿形即：渐开线齿形和摆线齿形。
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Cycloidaltooth profile of the internal gear pump, also called cycloidal rotor pump, pump the small gear and internal gear only related a tooth, so the internal gear pump do not need to set partition.