Pumps – Motor driven – Electric or magnetic motor
Patent
1990-12-04
1992-04-14
Bertsch, Richard A.
Pumps
Motor driven
Electric or magnetic motor
418 63, F04B 3500, F04C 1702
Patent
active
051042975
ABSTRACT:
A rotary compressor has an electric motor and a compression mechanism drivingly connected thereto by a crank shaft including an eccentric portion having flangelike thrust bearing sections and an eccentric pin section on which a rolling piston is mounted for eccentric rotation in a cylinder bore. The eccentric pin section has formed therein at least one axial through-hole for reducing the mass unbalance of the pin section. The crank shaft has formed thereon coaxial sections each concentric to the axis of rotation of the crank shaft and disposed between the eccentric pin section and one of the thrust bearing sections to decrease the axial dimensions thereof and of the eccentric pin section for thereby decreasing the total mass unbalance of the eccentric portion of the crank shaft whereby crank shaft deflection due to mass unbalance is remarkably reduced particularly at a high speed operation.
REFERENCES:
patent: 1543163 (1925-06-01), Johnson et al.
patent: 1983997 (1934-12-01), Rolaff
patent: 2153371 (1939-04-01), Hubacker
patent: 4730996 (1988-03-01), Akatsuchi et al.
patent: 4881879 (1989-11-01), Oritz
Sekiguchi Koichi
Serizawa Yukio
Bertsch Richard A.
Cavanaugh David L.
Hitachi , Ltd.
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