Feedback link for swash plate-type variable displacement hydraulic rotary machine
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United States of America Patent
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Oct 19, 2010
Grant Date -
Feb 21, 2008
app pub date -
Apr 14, 2006
filing date -
May 30, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A feedback link which transmits a movement of a servo piston to a control sleeve of a regulator is constituted by a link lever formed of a rigid material and an expansion spring formed of a spring material. The expansion spring is formed by folding a narrow leaf spring substantially into U-shape, and provided with a pair of convexly curved plate portions extending forward from a bent portion as a base end and spread apart from each other in a forward direction. On the other hand, an indented groove which is provided on the servo piston is composed of a parallel groove portion and a tapered groove portion. The convexly curved plate portions are engaged in the parallel groove portion of the indented groove in a resilient deformed state to transmit a displacement of the servo piston from the expansion spring to the link lever.
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