Patent ID: 7553144

Claim:
A gas compressor comprising: a housing having a suction port and a discharge port; two separate, independent housing heads disposed to define an internal space with the housing; and two rotors that are housed in the internal space, wherein the two rotors are rotatable around their rotary axes to form in the internal space a compression chamber in which gas drawn from the suction port is compressed, the compressed gas is discharged from the discharge port by the rotors, the housing has an inner wall surface opposed to at least outer peripheral surfaces of the two rotors, each of the housing heads is located to correspond to a corresponding one of the rotors and has inner wall surfaces opposed to corresponding end portions of the corresponding one of the rotors, each rotor has a rotary shaft, which has a first end and a second end, wherein the second end is opposite to the first end, and the first end of each rotary shaft is supported by the housing, and the second end of each rotary shaft is supported by one of the housing heads, respectively, each housing head has a first outer peripheral portion corresponding to the inner wall surface of the housing and a second outer peripheral portion, which is larger than the first outer peripheral portion, in each housing head, the first outer peripheral portion is axially adjacent to the second outer peripheral portion, and the first outer peripheral portion of each housing head is constructed to be fitted onto the inner wall surface of the housing.