Hydraulic control circuit for working machine

E - Fixed Constructions – 02 – F

Patent

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Details

E02F 3/43 (2006.01) E02F 9/20 (2006.01) E02F 9/22 (2006.01)

Patent

CA 2276148

The invention intends to realize that when a working implement comes close to a cab during works, the works can be continued while the working implement is avoided from interfering with the cab. To that end, a pilot pump oil line (P) capable of supplying pilot pressurized oil to a solenoid proportional pressure reducing valve (34) in a state where a control member is not manipulated, is provided in a stick contraction-side pilot oil line. When the working implement enters an interference prevention area, a stick is automatically moved out so that the works can be continued while avoiding the interference prevention area.

Ce circuit de commande hydraulique d'un engin de travail permet que lorsque la portion de travail se rapproche de la cabine du conducteur, lors d'une manoeuvre, cette portion soit empêchée d'entrer en contact avec la cabine mais continue cependant à fonctionner. On a monté un passage (P) d'huile de pompe de commande, dans un passage d'huile de commande latéral et de réduction, destiné à la manette de commande, afin d'alimenter en huile à pression de commande une soupape à solénoïde (34) de réduction proportionnelle de pression, quand un dispositif de déplacement n'est pas commandé. Il s'ensuit que, lorsque la portion de travail entre dans une zone empêchant tout contact avec la cabine, la manette de commande est automatiquement déplacée vers l'extérieur afin de permettre la continuation du travail et en même temps éviter ladite zone.

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