To provide a pressure conversion device allowing simplification of a circuit configuration of a fluid pressure control circuit and improvement of workability of a sliding section.
A pressure conversion device includes: a first piston 30-2 which includes a large diameter section partitioning the inside of a cylinder so as to demarcate a pressure receiving chamber having an opened suction port supplying fluid pressure to the inside of the cylinder and a small diameter section projecting to an opposite side of the pressure receiving chamber in relation to the large diameter section and is slidable in the cylinder; a partition member 30-5 which partitions the inside of the cylinder into a first space where the first piston is disposed and a second space where a discharge port supplying boosted fluid pressure to the outside is opened and includes a recess demarcating a boosting chamber between the recess and the slidably inserted small diameter section, a first flow passage connecting a fluid pressure supply section and the boosting chamber, a first check valve provided in the first flow passage, a second flow passage connecting the second space and the boosting chamber, and a second check valve provided in the second flow passage; and a second piston 30-17 which is slidably provided on the second space side in the cylinder and demarcates a volume variable pressure accumulation chamber between the second piston 30-17 and the partition chamber 30-5.
| JP2011185417A | 2011-09-22 | |||
| JP2012122495A | 2012-06-28 | |||
| JPH04277180A | 1992-10-02 |
| US4152921A | 1979-05-08 |
Hiroyasu Kanai
Koichiro Sakai