Integrated electric oil pump and operation method thereof

An integrated electric oil pump, comprising a pump housing, an oil inlet and an oil outlet, and further comprising:

• a fixed shaft provided in the pump housing, wherein a channel for cooling oil to pass through is defined in the fixed shaft;
• an inner gear eccentrically and rotatably connected with the fixed shaft;
• an outer gear coaxially connected with the fixed shaft and rotatably arranged in the pump housing, wherein the outer gear is located at an outer periphery of the inner gear and engaged with the inner gear;
• a motor rotor fixedly connected to an outer periphery of the outer gear;
• and
• a motor stator positioned at an outer periphery of the motor rotor and fixedly connected with the pump housing;
• wherein one end of the channel is in communication with the oil inlet, and an internal circulation of the cooling oil is achieved via the channel,
• wherein an eccentric calibrator for realizing eccentricity between the inner gear and the fixed shaft is provided between the fixed shaft and the inner gear,
• wherein the oil outlet is integrally formed in a circumferential outer wall of the pump housing, and
• wherein a bottom of the pump housing is integrally provided with a base to cover the oil inlet and the oil outlet, an end surface of the base is axially configured with a pressing hole fixedly connected to one end of the fixed shaft, a location hole is formed at one side of the eccentric calibrator and penetrates through the eccentric calibrator, a guide hole for assembly corresponding to the location hole is formed in the base, and the guide hole for assembly is eccentrically arranged relative to the pressing hole.