To provide an electrically-driven hydraulic actuator capable of securely discharging working fluid in the hydraulic actuator without using a solenoid valve.SOLUTION: An electrically-driven hydraulic actuator includes: a pump 7 using power of a motor 3; a hydraulic actuator 5 reciprocating between a first state and a second state while energized to become the first state; a reservoir 4; and a fluid circuit for controlling the hydraulic actuator by using a hydraulic pressure. The fluid circuit includes: a pressurization flow passage 201 for supplying fluid from the pump to the hydraulic actuator; a discharge flow passage 300 for discharging the fluid from the hydraulic actuator through an unloading valve 61 to the reservoir; a pilot flow passage 301 branched in the middle of the pressurization flow passage and supplying the fluid pressurized to a pilot pressure to the unloading valve; a mechanism 27 that generates the pilot pressure during an operation of the pump; and a check valve 26 for causing the fluid to pass from the pump only to a direction of a hydraulic cylinder. When the pump is operated, a transition to the second state is made, and when the pump is stopped, the state returns to the first state.SELECTED DRAWING: Figure 4

    【課題】電磁弁を用いずに液圧アクチュエーター内の作動流体を確実に排出することができる電動液圧アクチュエーターを提供する。【解決手段】モーター3を動力とするポンプ7、第1状態となるように付勢されつつ第1状態と第2状態とを往復運動する液圧アクチュエーター5、リザーバー4、液圧アクチュエーターを液圧で制御する流体回路を備え、流体回路は、流体をポンプから液圧アクチュエーターに供給する加圧用流路201、流体を液圧アクチュエーターからアンロードバルブ61を介してリザーバーへ排出させる排出用流路300、加圧用流路の途上で分岐してアンロードバルブにパイロット圧に加圧された流体を供給するパイロット流路301、ポンプの動作中にパイロット圧を発生させる機構27、流体をポンプから液圧シリンダーへの方向にのみ通過させる逆止弁26を備え、ポンプが動作すると第2状態に移行し、ポンプが停止すると第1状態に復帰する。【選択図】 図4


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    Title :

    ELECTRICALLY-DRIVEN HYDRAULIC ACTUATOR AND BRAKE DEVICE


    Additional title:

    電動液圧アクチュエーター、及びブレーキ装置


    Contributors:

    Publication date :

    2024-12-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF



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