An actuator unit is equipped with: a rod-side chamber and a piston-side chamber delimited by a piston inside a cylinder; a tank; a direction-control valve which makes it possible to selectively supply a working fluid discharged from a pump to the rod-side chamber and to the piston-side chamber; a first variable relief valve which is provided in a first control channel for connecting the rod-side chamber and the tank, allows the flow of the working fluid heading to the tank from the rod-side chamber by opening when the pressure from the rod-side chamber reaches a valve-opening pressure, and is capable of varying the valve-opening pressure; a second variable relief valve which is provided in a second control channel for connecting the piston-side chamber and the tank, allows the flow of the working fluid heading to the tank from the piston-side chamber by opening when the pressure from the piston-side chamber reaches a valve-opening pressure, and is capable of varying the valve-opening pressure; and a center channel for connecting the tank to the interior of the cylinder.


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    Title :

    Actuator unit


    Contributors:

    Publication date :

    2015-09-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B61F Untergestelle für Schienenfahrzeuge, z.B. Fahrgestellrahmen, Drehgestelle oder Anordnungen der Radsätze , RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES / F16F SPRINGS , Federn



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