Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1988-05-17
1989-11-07
Croyle, Carlton R.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
384322, 384399, F04C 1816
Patent
active
048788201
ABSTRACT:
A screw compressor comprises a casing and a pair of male and female rotors respectively having herical teeth and grooves formed in their outer peripheries. The rotors are arranged within the casing in meshing relation to each other through the teeth and grooves. Each rotor is rotatably supported by a pair of first and second radial plain bearings and a thrust plain bearing which is arranged at an end of the rotor shaft and adjacent the second radial plain bearing. Each of the thrust plain bearings is of dynamic-pressure type in which with rotation of a corresponding one of the shafts of the respective rotors, pressure is applied to lubricant by sliding movement of the thrust plain bearing to produce an anti-thrust force. The lubricant for each of the second radial plain bearings and for a corresponding one of the thrust plain bearings is fed to a space between the second radial plain bearing and the thrust plain bearing, and is distributed to the second radial plain bearing more in amount than that fed to the thrust bearing due to a difference between flow resistance with which the lubricant passes through the second radial plain bearing and flow resistance with which the lubricant passes through the thrust plain bearing.
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Doi Motomichi
Izushi Minetoshi
Kawaike Kazuhiko
Urashin Masayuki
Croyle Carlton R.
Hitachi , Ltd.
Thorpe Timothy S.
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