Rotary oil pump with pulsation reducing external rotor

摘要

In order to reduce the pulsation of the rotating oil pump, a hole (4) is formed in the second half of the tooth shape of the outer rotor (3). The second half of the tooth profile of the outer rotor (3) and the first half of the tooth profile of the inner rotor (3) are intermittent with each other, and the huge compression force plays a role in the rotating operation, but the kind of compression force is accepted in the hole (4) formed in the outer rotor (3), so the pulsation of the whole oil pump is reduced.