Harvester with hydraulically driven, flow-compensated rotary...

A - Human Necessities – 01 – D

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Details

A01D 34/66 (2006.01) A01D 34/80 (2006.01)

Patent

CA 2189440

A crop harvester (10) is provided with a rotary type cutter bed (30) in which a series of rotary cutters (32a-32j) extend across the path of travel of the machine for rotation about individual upright axes. A hydraulic drive for the cutter bed includes a variable volume pump (210) driven by the output shaft of an engine (208) associated with the harvester. The operating circuit of the hydraulic drive pumps oil through the circuit at a certain rate of flow, depending upon the engine speed and the position of a swash plate (260) within the pump. A control circuit communicating with the operating circuit (228) is capable of sensing load in the operating circuit tending to lug down and reduce the speed of the engine (208), which would normally reduce the flow rate and hence the cutter speed. However, in response to detecting such increased load, the control circuit compensates by adjusting the position of the swash plate (260) so as to correspondingly pump more oil at the lower engine speed, thus maintaining the cutter speed essentially constant.

Moissonneuse (10) comportant une barre de coupe rotative (30) dans laquelle une série de têtes de coupe rotatives (32a, 32j) s'étend à travers le trajet de déplacement de la machine, pouvoir pivoter autour d'axes verticaux individuels. Un système d'actionnement hydraulique de la barre de coupe comprend une pompe à volume variable (210) commandée par l'arbre de sortie d'un moteur (208) associé à la moissonneuse. Le circuit du système hydraulique pompe de l'huile à un certain débit en fonction de la vitesse du moteur et de la position d'un disque oscillant (260) à l'intérieur de la pompe. Un circuit de commande communiquant avec le circuit hydraulique (228) peut détecter dans ce dernier une charge susceptible de ralentir et de faire caler le moteur (208), ce qui normalement limiterait le débit et, par conséquent, la vitesse de la tête de coupe. Cependant, en réaction à la détection de l'augmentation de la charge, le circuit de commande effectue une compensation par réglage de la position du disque oscillant (260), de manière à pomper davantage d'huile lorsque le moteur tourne à une vitesse minimum, ce qui permet de maintenir constante la vitesse de la tête de coupe.

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