TRACTOR HYDRAULIC DRIVE Russian patent published in 1997 - IPC

FIELD: mechanical engineering; agricultural and industrial tractors and other self-propelled machines and vehicles. SUBSTANCE: tractor hydraulic drive has hydrostatic transmission of propelling devices with pump 1, hydraulic motor 2, power and return hydraulic lines 3, 4, hydraulic make-up line 8 and mounted equipment hydraulic system with pump 11, hydraulic distributor 12, hydraulic cylinder 13, filter 15 installed in return line, and hydraulic tank 16. Hydraulic drive has additional hydraulic accumulator 24. Inlet of hydraulic make-up line 8 is connected with working space of hydraulic accumulator 24. Two-line valve controlled from dividing member 25 of hydraulic accumulator is installed at outlet of return hydraulic line 14. This valve is closed in process of charging of hydraulic accumulator 24 and is open in process of discharging. Return hydraulic line 14 communicates with hydraulic make-up line 8 through check valve 29 at section after filter 15. EFFECT: enhanced reliability of operation. 4 cl, 1 dwg