| 摘要 |
<p>PURPOSE:To make a piston generate demanded great kinematic energy by making high pressure working liquid act on the piston from the beginning of the going stroke thereof in the reciprocating stroke. CONSTITUTION:A piston 15 is provided with both the first valve mechanisms 20, 21 and 18 which are communicated with a tank side pipe line 22 with the piston 15 in the proximity of its upper limit position, and the second valve mechanism 16 and 12 which are communicated with a pump side pipe line 3 with the piston 15 in the proximity of the lower limit position. A pilot chamber 24 of a three-port two-position-switching valve 8 is connected via a sequence valve 26 to the first valve mechanism 20, and the upstream end of the sequence valve 26 is connected to the second valve mechanism 16. When the piston 15 comes to the upper limit position, the sequence valve 26 is opened and the pilot chamber 24 is then communicated with a tank to change over the threepoort two-position- switching valve 8, on account of which high pressure working liquid may operate on the piston 15 from the beginning of its going stroke, generating great kinematic energy.</p> |
