| 摘要 |
The rolling contact bearings (12, 13) of an exhaust gas turbocharger shaft (10) are seated in axially displaceable damping bushes (14, 15) and are axially clamped by hydrodynamic forces, these forces increasing with the rotational shaft speed. The forces are produced by lubricating oil flowing in through oil feed holes (29, 30) in a bearing bush (5) into annular ducts (31, 32) between this bearing bush (5) and the damping bushes (14, 15), which takes plase as a result of the banking up of the lubricating oil in the annular ducts (31, 32) in front of the oil feed holes (33, 34) in the damping bushes (14, 15). A part of the lubricating oil passes through oil feed holes (24, 25) in the bearing bush (5) into very narrow annular gaps between the cylindrical circumferential faces of larger bush parts (16, 17) of the damping bushes (14, 15) and holes in the bearing bush (5). These lubricating oil fractions in the annular gaps damp vibrations of the shaft and of the bearing arrangement excited by the operational loading.
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