Abstract:
The present invention relates to a turn system actuated by hydraulic cylinders, applied to the four wheels of sugar-cane harvesters, wherein the harvester (80) comprises a rear axle (23) and a front axle (24), with wheel assemblies (9) associated to the axles (23, 24), wherein the rear axle (23) and the front axle (24) have a turn system, the one of the rear axle (23) being actuated by means of a double-action rear hydraulic cylinder (1) and that of the front axle (24) being actuated by means of a double-action front hydraulic cylinder (11), the hydraulic cylinders (1, 11) receiving a flow of oil through at least one flow divider (61) connected to an ortibrol (65) actuated by means of a steering wheel (60) of the harvester (80), the flow of oil received by the flow divider (61) being proportional to a factor related to the turn of the steering wheel (60), the turn system enabling the turn of the wheel assemblies (9) in amplitude ranging from 0.5 to 40 degrees, to the right or to the left, with respect to the longitudinal axis of the harvester (80).
Abstract:
La présente invention se rapporte à un ensemble comprenant:- un châssis pour engin terrestre mobile notamment agricole ou de travaux public; - au moins deux demi-traverses (21 ) montées télescopiques sur le châssis; - des supports de roues (27) montés pivotants sur chacune desdites demi-traverses; - des roues directrices montées rotatives sur lesdits supports; - un dispositif de pilotage de la direction des roues. L'ensemble est remarquable en ce qu'il comprend des moyens (39, 41, 47) conformés, pour une certaine position des deux demi-traverses, pour augmenter l'ouverture relative des roues lorsqu'elles pivotent, par rapport à l'ouverture relative des roues obtenue pour un même pivotement et une autre position des deux demi-traverses.