ELECTROHYDRAULIC FOLLOW-UP DRIVE Russian patent published in 2015 - IPC F15B9/03 G05B11/60 

FIELD: electricity.

SUBSTANCE: drive comprises a hydraulically close-looped axial-piston hydraulic motor and a variable-capacity axial-piston pump with a piston cam plate and hydraulic bearings, an electrohydraulic control mechanism, a drive motor, a mechanical transmission, a controlled facility, an auxiliary pump, a safety valve, the first and second feeding valves, a replenishing tank, the first and second summators, the first and second angle transmitters, at that the pumping line of the auxiliary pump is connected to inputs of the first and second feeding valves, which outputs are connected to main lines connecting the variable-capacity pump and the hydraulic motor, the input of the safety valve is connected to the pumping line of the auxiliary pump and the hydraulic input of the control mechanism, an input of the auxiliary pump and output of the safety valve are connected to the replenishing tank, the shaft of the drive motor is coupled kinematically to input valves of the variable-capacity pump and auxiliary pump, the first angle transmitter is coupled kinematically to the output valve of the mechanical transmission and by its electric output to the second output of the first summator, which first input is the control input of the drive, the second angle transmitter is coupled kinematically to the piston cam plate of the variable-capacity pump and by its electric output it is connected to the second output of the second summator, which first input is connected to the output of the first summator, the output of the second summator is coupled to the electric input of the control mechanism, the shaft of the hydraulic motor through the mechanical transmission is coupled kinematically to the controlled facility, at that the hydraulic motor is made with the piston cam plate and hydraulic bearings.

EFFECT: reduced dead zone of the drive.

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