PROBLEM TO BE SOLVED: To efficiently restrain generation of hunting.SOLUTION: A hydraulic circuit having a counter balance valve includes a pressure device for increasing pressure in an oil chamber communicated with a return side oil passage during winding down driving of a hydraulic motor. Further, in the hydraulic circuit, a check valve allowing the flow of pressure oil from a feed side oil passage to the oil chamber and blocking the flow of the pressure oil from the oil chamber to the feed side oil passage is disposed in parallel with a throttle provided in a passage communicated with the oil chamber communicated with the feed side oil passage during winding down driving of the hydraulic motor.SELECTED DRAWING: Figure 2
【課題】ハンチングの発生を、より効果的に抑制する。【解決手段】カウンタバランス弁を備えた油圧回路であって、油圧モータの巻下駆動時の戻り側油路と連通される油室の圧力を上昇させる加圧装置を備えた油圧回路。また、油圧モータの巻下駆動時の送り側油路と連通された油室と連通する通路に設けられた絞りと並列に、送り側油路から油室への圧油の流れを許容し、油室から送り側油路への流れを阻止する逆止弁が設けられた油圧回路。【選択図】図2
HYDRAULIC CIRCUIT
油圧回路
2016-12-28
Patent
Elektronische Ressource
Japanisch