| 摘要 |
PROBLEM TO BE SOLVED: To easily correct the dynamic balance of a rotor without correcting the rotor even in a roots type dry pump provided with a two-blade rotor. SOLUTION: Mass is increased and decreased in an optional position of a fly wheel 25A (25B) or timing gear 18A (18B) that is a rotor at the end of a rotating shaft 13A (13B). COPYRIGHT: (C)2003,JPO
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