Patent ID: 7104772

Claim:
A screw compressor comprising: screw rotors; suction-side rotor shafts of said screw rotors; a suction-side bearing casing, said suction-side bearing casing covering said suction-side rotor shafts; a suction-side angular ball bearing, said suction-side angular ball bearing rotatably supporting said suction-side rotor shafts and being held so as to be movable in a thrust direction within said suction-side bearing casing, wherein there is no cylindrical roller bearing at said suction side rotor shafts; discharge-side rotor shafts of said screw rotors; a discharge-side bearing casing, said discharge-side bearing casing covering said discharge-side rotor shafts; and a discharge-side angular ball bearing, said discharge-side angular ball bearing rotatably supporting said discharge-side rotor shafts and being held immovably within said discharge-side bearing casing.