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US 2008/0303336 A1Published application
Dump truck
AssigneeLiebherr Mining Equipment Company
InventorsJames Arthur Whitfield, Michael Kelly Yates
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AssigneeLiebherr Mining Equipment Company
InventorsJames Arthur Whitfield, Michael Kelly Yates
Estimating the term…
The present invention relates to a dump truck or large mining truck, comprising a dump body for the transport of overburden or the like, a first hydraulic circuit having a first pump device for the actuation of the dump body as well as a second hydraulic circuit having a second pump device for the actuation of a steering and/or of a braking device of the dumper truck chassis and/or an auxiliary truck element. In accordance with the invention, the said first, second and/or a further hydraulic circuit having are connected to one another by a valve device which is controlled by a control device such that the plurality of hydraulic circuits cooperate in an unloading mode and actuate the dump body together and, on the other hand, the hydraulic circuits work separately in a travel mode so that the second hydraulic circuit and/or any further hydraulic circuit is separated from the dump body and its actuator device. The performance of the pump devices are added so-to-say by the combination of the hydraulic circuits, whereby a fast unloading of the dump body can be achieved despite the huge load. On the other hand, the valve device can uncouple the hydraulic circuits from one another, whereby the second hydraulic circuit can be utilized specifically only for the steering and/or the braking device in the travel mode.
A dump truck, in particular a large mining truck, comprising a dump body (2) for the transport of overburden, a first hydraulic circuit (8) having a first pump device (9) for the actuation of the dump body as well as a second hydraulic circuit (10) having a second pump device (11) for the actuation of a steering (6) and/or of a braking device (7) of the dumper truck chassis (4), characterized in that the two hydraulic circuits (8, 10) are connected to one another by a valve device (12) which is controlled by a control device (13) such that, on the one hand, the two hydraulic circuits (8, 10) work together in a discharge mode and actuate the dump body (2) together and, on the other hand, the two hydraulic circuits (8, 10) work separately in a travel mode so that the second hydraulic circuit (10) is disconnected from the dump body (2) and its actuator device (14).
A dump truck in accordance with claim, wherein the at least one flow control valve (18) and the at least one switching valve (15, 16, 17) of the valve device (12) are controlled in different manners by the control device (13) in the unloading mode to achieve different speeds.
A dump truck in accordance with claim, wherein, at least one of the pump devices (9, 11) has a variable delivery pump with an adjustable pump flow, with the pump flow of the variable delivery pump being controlled by the control device (12), and
Dependencies are inferred from the claim text.