Oil pump of the internal gear type

摘要

An oil pump includes a pump body (1), an inner rotor (2) having outer teeth, and an outer rotor (3) having inner teeth. A maximum partition portion (13) is formed between a trailing end side (11t) of an intake port (11) and a leading end side (12s) of a discharge port (12) in a rotor chamber of the pump body (1). Among cells constituted by the outer teeth of the inner rotor (2) and the inner teeth of the outer rotor (3), a central cell (Sa) positioned in the location of the maximum partition portion (13) and adjacent cells (Sb) positioned before and after the central cell (Sa) in the direction of rotation are sealed by mutual contact of the outer teeth and the inner teeth. The outer teeth and the inner teeth constituting cells (S) other than the central cell (Sa) and adjacent cells (Sb) are not in contact with each other.