Mounting structure for electric oil pump

Abstract

A mounting structure for electric oil pump is provided to allow the electric oil pump to be mounted without through a communication pipe. The electric oil pump includes a pump unit having an inscribed gear pump, and a motor unit disposed adjacent to the pump unit and having a sensorless brushless DC motor for rotating the inscribed gear pump. A transmission accommodates the electric oil pump and includes a transmission case having an oil pan. The electric oil pump is attached to the transmission case with at least a through hole for supplying working oil to the pump unit being submerged in the working oil reserved in the oil pan.

1 . A mounting structure for electric oil pump comprising:
 an electric oil pump including   a pump unit having a pump,   a motor unit disposed adjacent to the pump unit and including a motor for rotating the pump,   a motor case for housing at least part of the motor unit, and   an intake opening formed in the motor case or the pump unit for supplying working oil to the pump unit; and   a transmission case including an oil pan for housing the electric oil pump,   wherein the electric oil pump is attached to the transmission case with at least the intake opening being submerged in the working oil reserved in the oil pan.   
     
     
         2 . The mounting structure according to  claim 1 , wherein
 the electric oil pump further comprises a driver unit for controlling rotating speed of the motor, and   wherein the driver unit is disposed outside the transmission case and located opposite to the motor unit across the transmission case.   
     
     
         3 . The mounting structure according to  claim 1 , wherein a strainer screen is attached to the intake opening. 
     
     
         4 . The mounting structure according to  claim 1 , wherein
 the pump unit includes an inner rotor, an outer rotor meshed with the inner rotor to rotate with rotation of the inner rotor, and a housing for accommodating the inner rotor and the outer rotor,   wherein the inner rotor and the outer rotor are made of different materials from each other, and   wherein the outer rotor is made of a material having a linear expansion coefficient greater than that of a material forming the housing.   
     
     
         5 . The mounting structure according to  claim 1 , wherein
 the electric oil pump further comprises a driver unit for controlling rotating speed of the motor,   wherein the driver unit receives a first signal which is outputted from the motor and corresponds to the rotating speed of the motor, and outputs the signal to an upper ECU as a second signal,   wherein the ECU determines whether the rotating speed of the motor falls within a normal range, and   wherein the driver unit corrects the received first signal to a signal falling within the normal range when the first signal indicates that the motor rotates with a rotating speed outside the normal range and within a predetermined range of rotating speed outside the normal range, and outputs the corrected signal to the ECU as the second signal.   
     
     
         6 . The mounting structure according to  claim 5 , wherein the first signal is corrected when the first signal indicates lower rotating speed than the normal range. 
     
     
         7 . The mounting structure according to  claim 1 , wherein
 the intake opening is provided opposite to the pump unit across the motor unit, and   wherein the working oil flows within the motor unit and is supplied to the pump unit.   
     
     
         8 . The mounting structure according to  claim 1 , wherein
 the pump unit includes a pump housing and a pump cover, which are disposed adjacent to each other,   wherein the pump housing and the motor unit are integrally attached to an inner wall of the transmission case, and   wherein the pump cover is formed in the transmission case.   
     
     
         9 . The mounting structure according to  claim 8 , wherein
 a recess is formed in an outer wall of the transmission case, and   wherein the driver unit is housed in the recess.