Electric oil pump apparatus

DETAILED DESCRIPTION OF THE INVENTION An oil pump apparatus 10 (an electric oil pump apparatus) according to an embodiment of the present invention is described hereinbelow with reference to the attached drawings.
As especially seen in FIG.
1, the oil pump apparatus 10 is provided, for example for a vehicle engine (not shown) and functions to electrically feed oil being applied with pressure and accumulated in an oil pan to lubricating devices of the engine.
An outer shape of the-oil pump apparatus 10 is formed with a pump housing (a pump housing) 11 made of metal such as aluminum, a resin-made motor housing (a motor housing) 12, and a bearing plate (a pump housing) 13 which is made of metal such as aluminum and is disposed between the pump housing 11 and the motor housing 12.
The pump housing 11, the motor housing 12, and the bearing plate 13 are all assembled as a single unit by means of bolts 14.
O-rings 13d are disposed between the pump housing 11 and the bearing plate 13 and between the motor housing 12 and the bearing plate 13.
The bearing plate 13 is arranged to cover an opening substantially axially opening in a direction of the motor housing 12, i.
e.
in a left-hand side in FIG.
1.
An oil chamber 15 is then defined in an inner space between the pump housing 11 and the bearing plate 13.
The pump housing 11 is provided with an oil suction port (a suction port) 16 for inhaling the oil into the oil chamber 15 and an oil discharging port (a discharging port) 17 for discharging the oil.
The pump housing 11 including the oil chamber 15, the suction port 16 and the discharging port 17 are illustrated in FIG.
3 in more details.
The bearing plate 13 is provided with a bearing opening portion (a drive side communicating portion and a bearing portion) 13a for disposing a metal-made shaft (shaft) 31 which is one of assembled members of a motor 30 (described later) therein.
In other words, the shaft 31 extends in the pump housing 11 and the motor housing 12 via the bearing opening 13a.
The bearing opening 13a functions for bearing the shaft 31 and further for rotating the shaft 31 around an axis thereof