Wheel loader

E - Fixed Constructions – 02 – F

Patent

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Details

E02F 3/34 (2006.01) E02F 3/42 (2006.01)

Patent

CA 2446908

The lifting structure with Z kinematics of a wheel loader consists of a machine arm (1) hinged to the vehicle frame or the front of the vehicle, said arm having a lifting cylinder (14), and a rockerlike reversing lever hinged to the machine arm (1), the tilting cylinder (9) and the connecting strap (12) being hinged to the ends of said lever to tilt the attachment (4). In order to tilt the attachment (4) with the required torque from a downward tilted position to an upward tilted position without having to reinforce the tilting cylinder (9) when the lifting structure is in raised position, at least one hydraulic cylinder (24,25) is hinged to the lifting structure before the articulation (10) connecting the tilting cylinder (9) to the vehicle frame in the direction of the attachment (4), wherein the connecting rod (28,29) of said cylinder hingedly engages in the pivoting axle (8) connecting the reversing lever (7) to the tilting cylinder (9).

La structure de levage avec cinématique en Z d'une excavatrice sur roues est constituée d'un bras de machine (1) articulé sur le châssis ou sur l'avant du véhicule, comportant un cylindre de levage (14), et d'un levier de renvoi (7) de type bascule, articulé sur le bras de machine (1), le cylindre de basculement (9) et l'éclisse de raccordement (12) étant articulés sur les extrémités dudit levier de renvoi pour le pivotement de l'outil (4). L'invention vise à faire pivoter l'outil (4) en position levée de la structure de levage, avec le couple suffisant, d'une position inclinée vers le bas vers une position inclinée vers le haut, sans amplification du cylindre de basculement (9). A cet effet, au moins un cylindre hydraulique (24, 25) est articulé sur la structure de levage, en direction de l'outil (4), devant l'articulation (10) reliant le cylindre de basculement (9) au châssis, la tige de piston (28, 29) dudit cylindre hydraulique étant en prise articulée avec l'axe de pivotement (8) reliant le levier de renvoi (7) au cylindre de basculement (9).

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