FLUID PRESSURE CYLINDER
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United States of America Patent
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app pub date -
Jan 29, 2016
filing date -
Feb 10, 2015
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Abstract
A hydraulic cylinder includes: a cylindrical cushion bearing that is clamped between a piston and a step portion of a piston rod; a cushion passage that is formed between the cushion bearing and a bearing receiving portion and that imparts resistance to the flow of the working oil passing therethrough; and a check seal that is provided between the inner circumference of the cushion bearing and the outer circumference of the piston rod. The check seal shuts off the flow of the working fluid from a connection gap between the piston rod and the piston towards the rod side chamber through the annular gap and allows the flow of the working fluid from the annular gap towards the bottom-side chamber through the connection gap.
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