PURPOSE: To restrict a resonance pulsation to only a little amplitude by connecting a volume to a plenum part of a pump discharge part, and providing this volume with a nozzle having a proper length and sectional area.
CONSTITUTION: For reducing a pressure pulsation generated by pressure waves from a pump 1 in an oil passage from a discharge port of a hydraulic pump 1 to a load, a volume 6 having an exhaust valve means 7 which can be closed is installed close to a discharge part 8 of the pump 1, and a nozzle 5 of a predetermined sectional surface extending toward the inside of the volume 6 in a predetermined length is provided at an inlet of the volume 26. The nozzle 5 is directly connected to a plenum part 2 of the pump discharge part 8, the inside of the volume 6 is exhausted till a residual air quantity becomes almost zero, and the inside of the plenum part and the nozzle 5 are both filled with pressure oil. A resonance range for pressure pulsation in tube ways can thus be limited in a very small range close to a starting end, thereby an excessive pressure resonance amplitude can be restricted effectively.
| JP2005522631 | Hydro transformer |
| JPS62174579 | LOW-NOISE AXIAL PLUNGER MACHINE |
OTANI HIDETOSHI
KITAMURA TAKESHI
| JPS60188519A | 1985-09-26 | |||
| JPS57177813A |