HYDRAULIC UNIT AND HYDRAULIC SYSTEM

To provide a hydraulic unit capable of improving energy saving performance.SOLUTION: A hydraulic circuit (10) of a hydraulic unit (1) includes a delivery flow passage (14) connecting a hydraulic pump (12) and a hydraulic actuator (3), a valve (15) blocking the flow of working fluid in the delivery f...

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Bibliographische Detailangaben
Hauptverfasser: INOUE MINEO, NAKAMURA HIROICHI, SEGAWA HITOSHI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a hydraulic unit capable of improving energy saving performance.SOLUTION: A hydraulic circuit (10) of a hydraulic unit (1) includes a delivery flow passage (14) connecting a hydraulic pump (12) and a hydraulic actuator (3), a valve (15) blocking the flow of working fluid in the delivery flow passage (14), and a leakage flow passage (17) fluidically connecting a flow passage portion (14a) between the valve (15) and the hydraulic pump (12) and a working fluid tank (11). A control device (20) adjusts a flow rate of the working fluid flowing through the leakage flow passage (17) when a first rotational frequency of the hydraulic pump (12) in execution of pressure control in the state in which the valve (15) allows the flow of the working fluid is higher than a first determination rotational frequency and when a second rotational frequency of the hydraulic pump (12) in execution of the pressure control in the state in which the valve (15) blocks the flow of the working fluid is lower than a second determination rotational frequency.SELECTED DRAWING: Figure 1 【課題】省エネ性を改善できる油圧ユニットを提供する。【解決手段】油圧ユニット(1)の油圧回路(10)は、油圧ポンプ(12)と油圧アクチュエータ(3)とを接続する吐出流路(14)と、吐出流路(14)の作動油の流れを遮断するバルブ(15)と、バルブ(15)と油圧ポンプ(12)との間の流路部分(14a)と作動油タンク(11)とを流体的に接続する漏らし流路(17)とを備える。制御装置(20)は、バルブ(15)が作動油の流れを許容している状態で圧力制御を実行した場合の油圧ポンプ(12)の第1回転数が第1判定回転数を上回っているとき、かつ、バルブ(15)が作動油の流れを遮断している状態で圧力制御を実行した場合の油圧ポンプ(12)の第2回転数が第2判定回転数を下回っているときに、漏らし流路(17)を流れる作動油の流量を調整する。【選択図】図1