| 摘要 |
With respect to a first plane S1 containing a center axis 1a of a screw rotor 1, a second plane S2 which intersects orthogonally with the screw rotor center axis 1a, and a third plane S3 which intersects orthogonally with the first plane S1 and the second plane S2, the center axis (2a) of the gate rotor 2 is on the third plane S3, and the tooth portions 20 of the gate rotor 2 do not overlap with the first plane S1 as viewed in a direction orthogonal to the third plane S3. |
