초록 ▼

A utility vehicle, such as a grape harvester (1), comprises a straddling frame (2), supported at its front and rear ends by double-acting hydraulic cylinders (17, 18 and 23, 24), which can be extended or retracted for levelling the frame (2). During horizontal or uphill travel, the rear cylinders (2

A utility vehicle, such as a grape harvester (1), comprises a straddling frame (2), supported at its front and rear ends by double-acting hydraulic cylinders (17, 18 and 23, 24), which can be extended or retracted for levelling the frame (2). During horizontal or uphill travel, the rear cylinders (23, 24) are blocked for providing the vehicle (1) with a fixed rear axle (55), while the front cylinders (16, 17) are hydraulically interconnected in order to let them extend or retract in opposition to each other for providing the vehicle (1) with an oscillating front axle (56). During downhill travel the front cylinders (17, 18) are blocked for fixing said front axle (56) to the frame (2) and the rear cylinders (23, 24) are hydraulically interconnected for letting the rear axle (55) oscillate to the frame (2). The rear and front oscillation is controlled by an inclination sensor (91). This control system on the one hand provides improved stability to the vehicle (1) when working on sloping ground and on the other hand ensures full ground contact for all wheels.

대표청구항 ▼

[ Having thus described the invention, what is claimed is:] [1.] A utility vehicle (1) comprising:a generally horizontal, rectangular frame (2) with opposed sides and opposed ends;two first ground-engaging members (3) at a first end of said frame (2) and two second ground-engaging members (4) at an

[ Having thus described the invention, what is claimed is:] [1.] A utility vehicle (1) comprising:a generally horizontal, rectangular frame (2) with opposed sides and opposed ends;two first ground-engaging members (3) at a first end of said frame (2) and two second ground-engaging members (4) at an opposite, second end thereof;first suspension means, supportingly mounted between said frame (2) and said first ground-engaging members (3) and comprising first oscillation means (27) for accomplishing movement of one first ground-engaging member (3) in opposition to the movement of the other first ground-engaging member (3);suspension control means (26, 49), comprising first oscillation control means (85), operatively linked to said first oscillation means (27) and changeable between an enabling and an inhibiting state, wherein said movement of the first ground-engaging members (3) is permitted and obstructed respectively; andsecond suspension means, supportingly mounted between said frame (2) and said second ground-engaging members (4)characterized in that:said second suspension means comprise second oscillation means (77) for accomplishing movement of one second ground-engaging member (4) in opposition to the movement of the other second ground-engaging member (4); andsaid suspension control means (26, 49) further comprise second oscillation control means (85), operatively linked to said second oscillation means (77) and changeable between an enabling and an inhibiting state, wherein said movement of the second ground-engaging members (4) is permitted and obstructed respectively.