SINTERED METAL BEARING AND METHOD FOR PRODUCING SAME

摘要

A sintered metal bearing is formed through sintering of a compact obtained through compression molding of raw-material powder. The sintered metal bearing includes chamfered portions that are respectively formed at least along outer rims of both end surfaces of the sintered metal bearing, and a dynamic pressure generating portion formed on an inner peripheral surface of the sintered metal bearing by sizing. An axial dimension of each of the chamfered portions is set smaller than a radial dimension of the each of the chamfered portions, and a difference in axial dimension between the chamfered portions on one end side and another end side in an axial direction of the sintered metal bearing is set larger than a difference in radial dimension between the chamfered portions on the one end side and the another end side in the axial direction.

主权项

1. A sintered metal bearing that is formed through sintering of a compact obtained through compression molding of raw-material powder, the sintered metal bearing comprising:
chamfered portions that are respectively formed at least along outer rims of both end surfaces of the sintered metal bearing; and a dynamic pressure generating portion formed on an inner peripheral surface of the sintered metal bearing by sizing, wherein an axial dimension of each of the chamfered portions is set larger than a radial dimension of the each of the chamfered portions, and wherein a difference in axial dimension between the chamfered portions on one end side and another end side in an axial direction of the sintered metal bearing is set larger than a difference in radial dimension between the chamfered portions on the one end side and the another end side in the axial direction.