OIL PUMP HAVING TWO ROTORS FOR REDUCING PULSATION OF AUTOMATIC TRANSMISSION

摘要

The present invention relates to an oil pump. More specifically, the present invention relates to a double oil pump for an automatic transmission reducing a pulsation due to high fluctuation pressure generated by a periodic abnormal flow of an outlet of a pump gear. To this end, the present invention is provided to enable a first inner external gear and a second inner external gear to be integrally rotated inside a pump housing, wherein concavities and convexities of outer teeth of the first inner external gear and the second inner external gear are alternately arranged.