| 摘要 |
A bearing supporting arrangement is provided for a turbocharger having a turbine shaft provided with turbine and compressor wheels. The bearing supporting arrangement includes first and second cylindrical oil film damper members, each of which is supported in a floating state through an oil film to the inner peripheral surface of a bearing housing thereby constituting an oil film damper. First and second annular ball bearings are coaxially fixedly supported respectively to the first and second oil film damper members. A generally cylindrical thrust receiving member is interposed between the first and second oil film damper members to be contactable with the first and second oil film damper members. The thrust receiving member is fixed at an axially intermediate portion to the bearing housing by a pin fixed to the bearing housing so as to be movable to make contact with the bearing housing. A first clearance (C1) is defined between the bearing housing and the thrust receiving member, while a second clearance (C2) is defined between the bearing housing and each of the first and second oil film damper members. In the above arrangement, a first ratio (C1/L1), of the first clearance (C1) relative to the axial length (L1) of the thrust receiving member, is set smaller than a second ratio (C2L2) of the second clearance relative to the distance (L2) between the axially outside end face of the first oil film damper member and the axially outside end face of the second oil film damper member.
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