To provide a hydraulic cylinder with a booster capable of simplifying a constitution by dispensing with a pilot operation check valve for preventing the leakage of a hydraulic fluid of a cap side cylinder chamber of a work cylinder.
A work cylinder body 2 and a boosting cylinder body 13 are fluid-tightly connected to a connection hole 4 of the work cylinder body 2 by inserting a boosting piston rod 17 projected from the boosting cylinder body 13. An annular seal member 23 sealing the cap side cylinder chamber 9 by slidingly contacting with the outer peripheral surface of the boosting piston rod 17 is arranged at the inner periphery of the connection hole 4. A supply-discharge passage 22 supplying the hydraulic fluid to the cap side cylinder chamber 9 via a part between the seal member 23 and the outer peripheral surface of the boosting piston rod 17 is arranged in a state of separating the seal member 23 from the outer peripheral surface of the boosting piston rod 17. Thus, the constitution can be simplified by preventing the leakage of the boosted hydraulic fluid of the cap side cylinder chamber 9 by the seal member 23.
BEPPU KUNINORI
YAMAGUCHI KUNIO
| JPS60256606A | 1985-12-18 | |||
| JP2000009104A | 2000-01-11 | |||
| JPS6097402U | 1985-07-03 |
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