HYDRAULIC HOLDING DEVICE

PROBLEM TO BE SOLVED: To provide a hydraulic holding device capable of suppressing a load applied from support target equipment from becoming equal to or higher than a constant load and functioning to attenuate the load and reducing vibration of the support target equipment.SOLUTION: Poppet valves 12 and 14 opening by urging valve elements 12A and 14A toward a head-side hydraulic chamber 4A and a rod-side hydraulic chamber 4B, respectively and escape valves 11 and 13 opening by urging valve elements 11A and 13A toward the head-side hydraulic chamber 4A and a rod-side hydraulic chamber 4B, respectively are provided in a flow passage 9 connecting the head-side hydraulic chamber 4A and the rod-side hydraulic chamber 4B, and working pressures of the escape valves 11 and 13 are set higher than those of the respective poppet valves 12 and 14. 【課題】支持対象機器から受ける荷重が一定以上になることを抑制し、かつ、荷重を減衰させ支持対象機器の振動を低減する機能を有する油圧式支持装置を提供すること。【解決手段】ヘッド側油室４Ａとロッド側油室４Ｂとを接続する流通路９に弁体１２Ａ，１４Ａを油室４Ａ，４Ｂに向けてそれぞれ付勢して開弁するポペット弁１２，１４と、弁体１１Ａ，１３Ａを油室４Ａ，４Ｂに向けてそれぞれ付勢して閉弁する逃し弁１１，１３とを設け、ポペット弁１２，１４よりもそれぞれ逃し弁１１，１３の作動圧力を高く設定した。【選択図】図１