Pump With A Modular Construction

A pump, such as a transmission oil pump, is disclosed. The pump includes an electric motor having a motor housing with a housing wall, and a pump device having a pump housing. A drive shaft of the electric motor is coupled to the pump device. The pump also includes an electrics housing with a motor controller for controlling the electric motor. The electrics housing is detachably attached to the pump housing on a side of the pump housing that faces away from the electric motor. The housing wall of the motor housing is designed as a bearing plate and is detachably arranged on the motor housing rim of the motor housing in the region of a groove which encircles the rim of the bearing plate. The pump housing is detachably arranged by an edge encircling the inside of the pump housing rim, on the bearing plate of the electric motor.