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.

The present invention provides an improved swash plate type variable capacity fluid machine which is fluid-tight, simple in structure, quiet in operation, and highly durable, yet without increasing its size, weight, and the amount of power loss.

The swash plate type variable capacity fluid machine (61) comprises: a cone (3); a disk (5); an enclosure wall (9) whose inner spherical surface surrounds the outer circumference of the disk (5); and a partition plate (7) movably fitted in a groove (17) of the cone (3). The cone (3) and the disk (5) are arranged to confront each other on an abutment line (A), thereby defining a plurality of variable capacity compartments (B, C, D). Supplying/discharging holes (31, 33) are provided to communicate with the variable capacity compartments (B, C, D), supplying and discharging a fluid there from. A synchronous mechanism (29) causes the cone (3) and the disk (5) to rotate about their center axis in synchronization.

With respect to a first plane S1 containing a center axis 1a of a screw rotor 1, a second plane S2 orthogonally intersecting with the screw rotor center axis 1a, and a third plane S3 orthogonally intersecting with the first plane S1 and the second plane S2, a gate rotor center axis 2a passes through an intersection point (P) among the first plane S1, the second plane S2 and the third plane S3 and moreover is inclined against the second plane S2 toward the same side as the groove portions 10 of the screw rotor 1, as viewed in a direction perpendicular to the third plane.