Patent ID: 9695845
Date: 2017-07-04
CPC Classifications: F01B,F15B

Claim:
1. A fluid pressure cylinder of which a piston rod fastened to a piston is provided capable of reciprocating in a cylinder tube, comprising: a closing member adapted to close an end opening portion of the cylinder tube; a working chamber defined between the closing member and the piston; a supply/discharge port formed in the closing member and communicating with the working chamber; and a cushion mechanism adapted to decelerate the piston rod in the vicinity of a stroke end when a working fluid in the working chamber is discharged through the supply/discharge port and the piston rod makes a stroke, wherein the cushion mechanism includes: a cylinder portion fitted with an inner peripheral surface of the cylinder tube; an annular holder fastened to an end surface of the cylinder portion; a plurality of fastening bolts each adapted to fasten the holder to the cylinder portion; an annular entry portion provided annularly on the piston rod and advancing into the holder and the cylinder portion in the vicinity of the stroke end; a discharge port formed in the cylinder portion and communicating with the supply/discharge port; a cushion passage formed by penetrating at least one of the plurality of fastening bolts and allowing the working chamber and the discharge port to communicate with each other and leading the working fluid in the working chamber to the discharge port when the annular entry portion enters into the holder and the cylinder portion; and an orifice portion provided in the cushion passage and applying resistance to a flow of the working fluid.