FLUID PRESSURE GENERATOR

摘要

PURPOSE:To provide a fluid pressure generator having excellent durability by forming an additional liquid flow toward a discharge port from a supply port in a pressure chamber. CONSTITUTION:The inside of a cylinder 2 is partitioned into a pressure chamber 4 to which additional liquid is supplied by a freely reciprocating piston 3 and an oil pressure chamber 5 to/from which oil pressure to drive the piston 3 is supplied/discharged. A supply port 4a to supply the additional liquid and a delivery port 4b to deliver the additional liquid are respectively opened at intervals in the pressure chamber 4. A slide ring 6 to lubricate a part between it and the cylinder 2 is arranged on a circumferential surface of the piston 3. Therefore, generation of water scale or the like because of the additional liquid stay in the pressure chamber 4 can be prevented. Strength of friction between the piston 3 and the cylinder 2 can be restrained to the minimum extent by the slide ring 6, and seizure of the piston 3 can be prevented.