TRACTOR HITCH Russian patent published in 1997 - IPC

FIELD: tractor building, in particular, equipment for hitching agricultural tools to tractor. SUBSTANCE: tractor hitch has upper and lower tie-rods pivotally mounted on tractor frame, pneumohydraulic device connected with pneumatic system of tractor and formed as main cylinder 7 with floating piston 10 separating pneumatic and hydraulic cavities, piston 8 with stem 9 and overflow valve formed as auxiliary cylinder 13 with hydraulic and pneumatic cavities. Pneumatic cavity of cylinder 13 is connected with pneumatic cavity of main cylinder 7 and its hydraulic cavity is communicated with hydraulic stem cavity of cylinder 7. Stem and piston cavities of main cylinder 7 are connected with hydraulic system of tractor via adjustable throttles 15 and 16. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 2 cl, 2 dwg