To provide a hydraulic servo device configured so that inconvenience that a servo cylinder operates greatly can be suppressed even if an electromagnetic control valve breaks down.SOLUTION: The hydraulic servo device comprises: a pair of control passages 11 individually communicating with two oil chambers 10s of a servo cylinder 10; a pair of electromagnetic control valves 20 that individually supply the pair of control passages 11 with hydraulic oil from a hydraulic oil pump 12; a pair of on-off valves 30 that individually control flowing of the hydraulic oil through the control passages 11; and drain passages 13 communicating with the pair of control passages 11. The on-off valves 30 close the control passages 11 when pressure of the control passages 11 is less than a set value, and open the control passages 11 when the pressure reaches the set value or more. The on-off valves 30 close the drain passages 13 communicating with the other control passages 11 accompanying the closing, and the on-off valves 30 open the drain passages 13 communicating with the other control passages 11 accompanying the opening.SELECTED DRAWING: Figure 1
【課題】電磁制御弁が故障してもサーボシリンダが大きく作動する不都合を抑制できる油圧サーボ装置を構成する。【解決手段】サーボシリンダ10の2つの油室10sに個別に連通する一対の制御流路11と、一対の制御流路11に作動油ポンプ12からの作動油を個別に供給する一対の電磁制御弁20と、制御流路11での作動油の流れを個別に制御する一対の開閉弁30と、一対の制御流路11に連通するドレン流路13とを有している。開閉弁30は、制御流路11の圧力が設定値未満にある際に制御流路11を閉塞し、圧力が設定値以上に達した際に制御流路11を開放し、開閉弁30は閉塞に伴い他方の制御流路11に連通するドレン流路13を閉塞し、開閉弁30は開放に伴い他方の制御流路11に連通するドレン流路13を開放する。【選択図】図1
HYDRAULIC SERVO DEVICE
油圧サーボ装置
2021-01-14
Patent
Electronic Resource
Japanese
IPC: | B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES |