Patent ID: 8864480

Claim:
An oil recovery member configured to be coupled to a center of a rotor, the rotor being engaged with an outer circumferential surface of a rotational shaft, the rotational shaft having a bottom end configured to be positioned in oil, such that, when the rotor is operated, the oil rises along the rotor in an axial direction, flows along an outer surface of the oil recovery member and is guided in a radial direction, the oil recovery member comprising: a main body having a funnel shape with a diameter that increases from a lower portion to an upper portion in an axial direction of the main body; a guide portion that extends from a top end of the main body in a a radial direction of the main body; and a mounting portion provided at a bottom end of the main body to be mounted on a top end center of the rotor, wherein a ratio of a diameter (a) of the guide portion to an outer diameter (b) of the bottom end of the main body is maintained to be equal to or larger than 2.85 (a/b≧2.85) and to be equal to or smaller than 3.15 (a/b≦3.15).