Patent ID: 8292512

Claim:
A supporting construction comprising: a ball bearing to which lubricating oil is fed from an axial direction so that the ball bearing is forcibly lubricated and which supports a rotational shaft on a housing, wherein the ball bearing comprises: an inner ring fitted on the rotational shaft from outside; an outer ring fitted in the housing from inside; a plurality of balls rotatably provided between the inner ring raceway and the outer ring raceway; and a crown resin cage for retaining the balls at equal intervals in a circumferential direction, and wherein the crown cage comprises: an annular rim portion; a plurality of pillar portions disposed on an axial end face of the rim portion at predetermined intervals in the circumferential direction; and pockets formed between the pillar portions for retaining the balls rotatably; wherein the rim portion of the crown cage is disposed on a flow-in-side from which the lubricating oil flows thereinto such that the pockets are opened on a flow-out side of the balls.