SCROLL FLUID MACHINE

摘要

Provided is a scroll fluid machine that, by using a crankshaft manufactured by cold forging and a needle bearing, can sufficiently exhibit the performance of a variable circling radius mechanism, can provide a sufficient reliability on a bearing portion of the crankshaft, and can be manufactured inexpensively. For this purpose, in a crankshaft (60) used for a driving force transmission system, a reinforced shaft unit (63) and a circular column-like large diameter unit (61) are formed at an end of a rotating shaft (16), a material is produced by a cold forging process so that an eccentric shaft (62) projects from the circular column-like large diameter unit (61), the circular column-like large diameter unit (61) is rotatably coupled to a housing 11 via a needle bearing (64), and the variable circling radius mechanism is stably operated with rigidity increased by the reinforced shaft unit (63).