发明名称 |
Shaft seal structure for vacuum pump |
摘要 |
A vacuum pump has a housing accommodating a rotary shaft and a gas transferring assembly driven by the rotary shaft. The housing has an exhaust passage for exhausting gas outside the housing. The gas transferring assembly creates a vacuum. A lip seal for shaft seal is disposed between a pump chamber communicating with the exhaust passage and a region in which oil exists so as to slide relative to a circumferential surface of the rotary shaft. The lip seal has a back pressure surface in a back pressure region facing the pump chamber and a pressure surface facing the region in which the oil exists. A communicating passage in the housing intercommunicates the back pressure region and the exhaust passage for applying at least substantially the pressure in the exhaust passage to the back pressure surface. <IMAGE> |
申请公布号 |
EP1227246(A3) |
申请公布日期 |
2003.07.02 |
申请号 |
EP20010129965 |
申请日期 |
2001.12.17 |
申请人 |
KABUSHIKI KAISHA TOYOTA JIDOSHOKKI |
发明人 |
YAMAMOTO, SHINYA;SUZUKI, YOSHINARI;IDA, MASAHIRO;KAWAGUCHI, MASAHIRO |
分类号 |
F04C23/00;F04C25/02;F04C27/00;F04C29/00 |
主分类号 |
F04C23/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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