FORK-LIFT TRUCK HYDRAULIC SYSTEM Russian patent published in 2000 - IPC

FIELD: materials handling facilities; hydraulic system of fork-lift trucks and vehicles with hydraulic steering gears. SUBSTANCE: proposed system has lifting and tilting hydraulic cylinders of working circuit load lifting mechanism, hydraulic distributor with mechanism lifting and tilting control sections, pressure hydraulic line with safety-relief valve connected to lifting control section, working circuit pump and steering control circuit. The latter has hydraulic five-line steering mechanism connected to steering circuit pump through pressure hydraulic line furnished with safety valve. Steering circuit pump is connected through steering mechanism and hydraulic communication line to tilting control section and, through this section and check valve, to pressure hydraulic line of working circuit. Hydraulic communication line is connected with drain through pressure valve. Fifth hydraulic line of steering mechanism is connected to pressure hydraulic line of working circuit. Pressure valve is adjusted to pressure corresponding to load lifting mechanism rated load pressure. EFFECT: reduced losses in system at tilting control, provision of rated load capacity at operation on high-viscosity working fluid at cold weather. 2 cl, 3 dwg