Patent ID: 6846163

Claim:
A rotary fluid machine comprising: at least a first energy-converting portion and a second energy-converting portion, said rotary fluid machine being capable of functioning as an expander for unifying and outputting mechanical energies generated respectively by the first and second energy-converting portions by inputting a working fluid having a pressure energy into the first and second energy-converting portions to convert said pressure energy into a mechanical energy, said rotary fluid machine being capable of functioning as a compressor for unifying and outputting pressure energies of the working fluid generated respectively by the first and second energy-converting portions by inputting a mechanical energy into the first and second energy-converting portions to convert said mechanical energy into the pressure energy, said first energy-converting portions including cylinders supported radially in a rotor rotatably accommodated in a rotor chamber, and pistons slidably supported in said cylinders, and said second energy-converting portions including vane grooves defined radially in the rotor, and vanes slidably supported in said vane grooves with outer peripheral surfaces thereof being in sliding contact with an inner peripheral surface of the rotor chamber, wherein said rotor includes a rotor core which is supported on a rotary shaft and in which said cylinders are accommodated, and rotor segments separated in a circumferential direction from and formed separately from said rotor core and fixed to surround an outer periphery of said rotor core, each of said vane grooves for slidably supporting the vanes therein being defined between adjacent ones of the rotor segments.