SELF-PROPELLED BOOM CRANE HYDRAULIC DRIVE Russian patent published in 2000 - IPC

FIELD: lifting and transport engineering. SUBSTANCE: proposed hydraulic drive has load moment limiter, supply source, boom telescopic and lifting mechanisms hydraulic cylinders 3, 4, turntable and load winch with brakes hydraulic motors 1, 5 communicating through first distributing unit 7 with one of axial-piston variable-capacity pumps 31 with power regulator and tank. Boom telescoping and lifting mechanisms hydraulic cylinders and load winch hydraulic motor communicate through second distributing unit with other axial-piston variable-capacity pump 32 with power regulator and tank. Pneumohydroaccumulator is installed in main line between control pump and control spaces of three-position distributors. Distributing units include electromagnetically controlled pressure regulators coupled with load moment limiter and manipulators coupled with corresponding electromagnets of pressure regulators of each distributing unit. Additional pump 34 with self-contained motor communicates with pneumohydroaccumulator and with distributing units. EFFECT: enlarged range of operation speed control. 3 cl, 1 dwg