Motor cooling device

A motor cooling device, comprising:

• an annular member that is fixed to an outer circumference of a shaft of a motor and configured to rotate with the shaft inside a casing;
• and
• an oil catch unit that has a groove-shaped cross-section and is disposed inside the casing along an outer circumference of the annular member, with a groove of the oil catch unit facing an outer circumferential surface of the annular member,
• wherein the oil catch unit extends from a lower side of the annular member in a direction of gravity toward a backward side in a rotation direction of the annular member so as to form an arc shape,
• wherein the oil catch unit includes a closure plate and an oil spout hole, the closure plate being located on a forward side in the rotation direction and covering the groove at an end in a circumferential direction, the oil spout hole being bored near the closure plate so as to open toward a rotor of the motor, and
• wherein the annular member includes a protrusion that is provided on the outer circumferential surface of the annular member, and that is configured to move inside the groove of the oil catch unit toward the closure plate, on a radially inner side of the closure plate, when the annular member rotates with the shaft.