VARIABLE DISPLACEMENT SWASH PLATE TYPE HYDRAULIC ROTARY MACHINE

摘要

A feedback link (30) which transmits a movement of a servo piston (18) to a control sleeve (26) of a regulator (24) is constituted by a link lever (31) formed of a rigid material and an expansion spring (34) formed of a spring material. The expansion spring (34) is formed by folding a narrow leaf spring substantially into U-shape, and provided with a pair of convexly curved plate portions (34B, 34C) extending forward from a bent portion (34A) as a base end and spread apart from each other in a forward direction. On the other hand, an indented groove (21) which is provided on the servo piston (18) is composed of a parallel groove portion (21A) and a tapered groove portion (21B). The convexly curved plate portions (34B, 34C) are engaged in the parallel groove portion (21A) of the indented groove (21) in a resilient deformed state to transmit a displacement of the servo piston (18) from the expansion spring (34) to the link lever (31).