Rolling bearing arrangement

摘要

A rolling bearing arrangement for a turbocharger is comprised of a bearing housing relative to which a rolling bearing is supported. The rolling bearing is securely provided with an outer sleeve which is disposed to surround the periphery of the rolling bearing. The rolling bearing is supported through the outer sleeve on the bearing housing. A first annular space is defined between the outer sleeve and the inner periphery of the bearing housing. An oil inlet opening is opened at the inner periphery of the bearing housing so that lubricating oil is supplied through the oil inlet opening to the first annular space. An oil film damper clearance is formed between the outer sleeve and the bearing housing inner periphery and located adjacent the first annular space in the axial direction of the outer sleeve so that the entire flow of lubricating oil supplied to the first annular space passes through the oil film damper clearance. A second annular space is defined between the outer sleeve and the bearing housing inner periphery so that at least a part of the lubricating oil passed through the oil film damper clearance is supplied to the second annular space. An oil supply passage is so formed that lubricating oil from the second annular space is introduced to the rolling bearing. Additionally, an oil bypass passage is so formed that lubricating oil from the second annular space is introduced to an oil outlet opening through which the lubricating oil is discharged out of the bearing housing.