DOUBLE-ROW BALL BEARING AND BEARING DEVICE FOR SUPPORTING PINION SHAFT

摘要

A double-row ball bearing rotatably supports a pinion shaft having a pinion gear at its one end. The double-row ball bearing includes an outer ring member having a large diameter raceway surface and a small diameter raceway surface; an inner ring member having a large diameter raceway surface and a small diameter raceway surface corresponding respectively to the large diameter raceway surface and the small diameter raceway surface of the outer ring member; a large diameter-side ball row interposed between both large diameter raceway surfaces; a small diameter-side ball row interposed between both small diameter raceway surfaces; a large diameter-side retainer for retaining the large diameter-side ball row; and a small diameter-side retainer for retaining the small diameter-side ball row. Of both ball rows, the ball row, opposed to the pinion gear receives the load before the pinion gear-side ball row receives it.