Bearing and screw compressor

A screw compressor comprising:

• a casing;
• a pair of female and male screw rotors meshed with each other and housed within said casing;
• radial bearings mounted in sliding contact with rotor shafts of said pair of female and male screw rotors to undergo radial forces transmitted thereto from said rotor shafts;
• and
• thrust bearings disposed on both sides of a disc-like thrust member, said disc-like thrust member being fitted on one of the rotor shafts of each of said pair of female and male screw rotors, to undergo a thrust force transmitted from the associated screw rotor to said thrust member,
• wherein said thrust bearings each comprise:
• a resin bearing, said resin bearing comprising a backing strip and a slide member formed by a resin layer and bonded to said backing strip;
• a metallic bearing, said metallic bearing comprising a backing strip and a sliding metallic member bonded to said backing strip;
• a temperature sensor for measuring a temperature corresponding to the temperature of said sliding metallic member, said temperature sensor being fitted in a hole formed in said backing strip of said metallic bearing;
• and
• a bearing holding member,
• wherein a plurality of bearing fitting recesses are formed at equal intervals on a circle having a radius centered on the center of said bearing holding member, and said resin bearing and said metallic bearing are fitted mixedly in said bearing fitting recesses.

A screw compressor comprising:

• a casing;
• a pair of female and male screw rotors meshed with each other and housed within said casing;
• radial bearings mounted in sliding contact with rotor shafts of said pair of female and male screw rotors to undergo radial forces transmitted thereto from said rotor shafts;
• thrust bearings disposed on both sides of a disc-like thrust member, said disc-like thrust member being fitted on one of the rotor shafts of each of said pair of female and male screw rotors, to undergo a thrust force transmitted from the associated screw rotor to said thrust member;
• and
• an oil supply means for supply oil after separation and recovery from discharge gas compressed by said screw rotors as lubricating oil to said radial bearings and said thrust bearings,
• wherein at least one of surfaces of said radial bearings opposed to the rotor shafts and surfaces of said thrust bearings opposed to said thrust member are covered with a resin material.