Electronic oil pump

An electronic oil pump comprising:

• a lower case having one side where the suction passage and discharge passage of a fluid are formed and the other side where a gerotor seating part is formed;
• an upper case having one side open, having a cooling space formed therein, and having a lower case coupled to an open surface of the one side;
• a gerotor installed on the seating part, and including an internal rotor and an external rotor engaged with each other to be eccentrically rotated for its one side to communicate with the suction passage and the other side to communicate with the cooling space;
• an electric motor installed in the cooling space, and including a shaft for transmitting a rotational force to the gerotor;
• and
• a flexible seal sealing the other side of the gerotor, and opened by an internal pressure of the gerotor to supply the fluid pumped by the gerotor to the cooling space,
• wherein the cooling space communicates with the discharge passage for the fluid exchanging heat with the electric motor to be discharged through the discharge passage, wherein the lower case includes:
• a bottom plate having an upstream end of the suction passage and a downstream end of the discharge passage formed in its one surface;
• a body extending from the other surface of the bottom plate to the other side, and having a diameter smaller than a diameter of the bottom plate;
• and
• the seating part spaced apart from a circumference of the body inward in a radial direction and recessed from the other surface to its one side, and
• the suction passage and the discharge passage are formed in the body,
• a downstream end of the suction passage passes through the seating part to communicate with the gerotor, and
• an upstream end of the discharge passage passes through the circumference of the body to communicate with the cooling space,
• wherein the body includes:
• a discharge groove formed therein by a certain distance from the other end of the body to its one side and recessed inward from an outer surface of the body in the radial direction;
• and
• a discharge hole passing through the body in the radial direction for one end of the discharge groove and the upstream end of the discharge passage to communicate with each other, and
• the discharge passage communicates with the cooling space through the discharge groove and the discharge hole.