POSITIVE DISPLACEMENT FLUID MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a low-cost, highly reliable positive displacement fluid machine by reducing the power loss of an oil feeding pump to improve compression performance. SOLUTION: This positive displacement fluid machine is provided with: a mechanism part for compressing and feeding a working fluid or for extracting dynamic energy from the working fluid; a shaft for extracting output by driving the mechanism part; a bearing member; and the oil feeding pump. The oil feeding pump 20 is provided with: the bearing member 21 for rotatively supporting the shaft 14; an oil channel 21a formed along the circumferential surface of the shaft 14; an oil feeding passage 21b having one end connected to the front edge side in the shaft rotation direction of the oil channel 21a and having the other end formed on the circumferential surface of the shaft so as to be opened to an oil storing chamber 22; and an oil feeding port 14a formed in the shaft 14, having one end connected to the rear edge side in the shaft rotation direction of the oil channel 21a and having the other end communicating with a slide part for feeding the oil.