Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device

Abstract

The invention relates to a position control device for a hydraulic actuator, such device comprising a hydraulic circuit comprising a pump supplying the two chambers of the actuator from a hydraulic tank or reserve by means of a servovalve, each outlet of the servovalve being connected to a chamber of the actuator by means of a non return valve. This such device is characterized in that at least one of the outlets of the servovalve connected a chamber of the actuator is also connected to the hydraulic tank by a calibrated nozzle upstream of the non return valve. The invention also relates to an interface plate for a servovalve allowing such a device to be implemented. The invention can namely be applied to the open loop and/or closed loop servo control of the laying of a gun barrel.

1 . A position control device for a hydraulic actuator, such device comprising a hydraulic circuit comprising a pump supplying the two chambers of said hydraulic actuator from a hydraulic tank or reserve by means of a servovalve, each outlet of said servovalve being connected to one of said chambers of said actuator by means of a non return valve, wherein at least one of said outlets of said servovalve connected one of said chambers of said actuator is also connected to said hydraulic tank by a calibrated nozzle upstream of said non return valve.  
   
   
       2 . A position control device according to  claim 1 , wherein said device comprises a calibrated nozzle connecting said each outlet of said servovalve to said hydraulic tank.  
   
   
       3 . An interface plate for a servovalve implemented in the device according to one of  claim 1 , said plate incorporating at least four transversal drill holes intended to cooperate with four hydraulic openings or ports of said servovalve, thus to supply with pressurised fluid via a pump, an outlet to said tank, a first control path for a first chamber of said actuator and a second control path for a second chamber of said actuator, wherein said plate incorporates at least one leak circuit connecting one of said control paths to said tank outlet, said circuit in which is positioned a calibrated nozzle.  
   
   
       4 . An interface plate for a servovalve according to  claim 3 , wherein said plate incorporates two leak circuits comprising a calibrated nozzle, each said circuit connecting said first or second control path to said tank outlet.  
   
   
       5 . An interface plate for a servovalve according to  claim 4 , wherein said leak circuits is advantageously made in the form of holes perpendicular to one another and to said transversal drill holes corresponding to said first and second paths.  
   
   
       6 . An interface plate for a servovalve according to  claim 5 , wherein the outward opening of said each hole is stopped by a plug.  
   
   
       7 . An interface plate for a servovalve according to  claim 3 , wherein said nozzles are made in the form of screws having a calibrated axial orifice.  
   
   
       8 . An interface plate for a servovalve according to  claim 4 , wherein said nozzles are made in the form of screws having a calibrated axial orifice.  
   
   
       9 . An interface plate for a servovalve according to  claim 5 , wherein said nozzles are made in the form of screws having a calibrated axial orifice.