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

FIELD: electricity.

SUBSTANCE: drive comprises an interclosed hydraulically axial-piston motor and an adjustable axial-piston pump with a piston cam plate and hydrostatic bearings, an electrohydraulic control mechanism, a drive motor, a mechanical transmission, a controlled system, an auxiliary pump, a safety valve, the first and second feeding valves, a feeding tank, the first and second summators, the first and second angle-data transmitters. The pump line of the auxiliary pump is connected to inputs of the first and second feeding valves, which outputs are connected to the main lines connecting the adjustable pump and the hydraulic motor, an input of the safety valve is connected to the pump 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 feeding tank, the shaft of the drive motor is coupled kinematically to input shafts of the adjustable pump, the first angle-data transmitter is coupled kinematically to the output shaft of the mechanical transmission and by its electrical output its connected to the second input of the first summator, which first input is the control input for the drive, the second angle-data transmitter is coupled kinematically to the piston cam plate of the adjustable pump and by its electrical output it is connected to the second input of the second summator, the output of the second summator is connected to the electrical input of the control mechanism, the shaft of the hydraulic motor through the mechanical transmission is coupled kinematically to the controlled system, at that the hydraulic motor is made with the piston cam plate and hydrostatic bearings.

EFFECT: reduced dead zone of the drive.

5 dwg