Two row tapered roller bearing with oil supply through a spacer of a split inner ring

摘要

Fretting wear at the locations of contact between rolling elements and an inner ring is prevented even in the case where the outer ring and the inner ring of a roller bearing are rotating in synchronization. In a roller bearing (9) oil feed device in which a plurality of rolling elements (23) are arranged in a plurality of rows in the axial direction between this outer ring (21) and inner ring (22), the inner ring being divided for each row of the rolling elements (23) and a ring-shaped spacer (40) being interposed at the position of this division, the inner rings (22) and spacer (40) being fitted onto a rotary shaft (3), a circumferential groove (31) is provided in the inner peripheral section of the spacer (40) and oil feed holes (30) communicating with the circumferential groove (31) are provided in the rotary shaft (3) and an oil feed passage (47) having an inlet (48) opening into the circumferential groove (31) and an outlet (51) opening to a corner on at least one side in the axial direction of the spacer (40) is provided in the spacer (40). Since the outlet (51) of the oil feed passage (47) opens in a position which is immediately next to the locations of contact of the rolling elements (23) and inner ring (22) of each row, an ample amount of oil is distributed to these locations of contact and fretting wear can thus be prevented.