MACHINE HYDRAULIC DRIVE STARTING PREHEATER Russian patent published in 2002 - IPC

FIELD: mechanical engineering. SUBSTANCE: invention relates to road-building machines operating at insignificant travel motions, for instance, excavators, cranes and others where it can be used as counterweight. According to invention, heat engine with liquid heat carrier circulation circuit is coupled with heat accumulator connected from one side with engine exhaust pipe and at other side, with suction line of additional pump. Distributor is installed in pressure line of additional pump. One section of distributor is directly coupled with pump of hydraulic system. Delivery of working liquid prepared for operation to hydraulic system elements provides quick heating of main pump and other elements of drive. Thanks to it, consumption of energy for preparation for operation is reduced and number of failures in operation under below zero temperatures is brought to minimum. EFFECT: simplified design and reliable operation of device at below zero temperatures. 2 dwg