| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing sealing device for a rotor shaft to be lubricated during stop, having improved sealing performance for sealing a bearing housing of an exhaust driven supercharger against introduced lubricant in the axial direction. SOLUTION: A first seal 11 such as a gap, a labyrinth or a piston ring and a second seal 12 such as a small gap 33 or a labyrinth are provided on the rotor shaft 1. Between the first and second seals 11, 12, oil discharge passages 13, 14 extending to the periphery of the rotor shaft 1 is formed to be closed up. The discharge passages 13, 14 are formed by a housing side oil discharge groove 13 and a shaft side oil discharge groove 14 arranged at the coaxial position. At the radially free end of the rotor shaft 1 in the oil discharge passage 13, 14, an annular seal tongue piece 15 is provided protruding into the annular oil discharge passages 13, 14. The tongue piece 15 serves as a barrier which operates on the lubricant entering into the oil discharge passages in the axial direction. COPYRIGHT: (C)2006,JPO&NCIPI
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