Excavator and a machine for material transfer

a material transfer and excavating machine technology, applied in mechanical devices, couplings, constructions, etc., can solve problems such as failures with limitations, and achieve the effects of less power, less energy to be removed, and high working speed

Inactive Publication Date: 2009-03-19
LEIBHERR HYDRAULIKBAGGER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an excavator or machine for material transfer that can store and reuse energy for subsequent work cycles. This is achieved by adding one or more additional hydraulic cylinders to the movable elements, which are connected to their own hydraulic accumulator. The accumulator compensates for the weight of the equipment, reducing the energy required for lifting. The additional hydraulic cylinders can be connected at different positions, and can be connected to the main hydraulic circuit or a switchable valve. This results in higher efficiency, lower fuel consumption, and lower operating costs. The bearing strains of the hydraulic cylinders can be distributed onto more bearing positions, and the processes of feeding energy into the additional hydraulic cylinder(s) are possible at any pressure level. This also provides system redundancy.

Problems solved by technology

However, this is only successful with limitations since the infeed pressure must always be larger than the system pressure in the main circuit.

Method used

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  • Excavator and a machine for material transfer
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  • Excavator and a machine for material transfer

Examples

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Embodiment Construction

[0021]A detail of a hydraulic excavator is shown with reference to FIG. 2 by way of example for an excavator and machines for material transfer. Here, a boom 12 is pivotably hinged to a rotating deck 10, with the pivoting up and down of the boom 12 taking place via hydraulic cylinders 14. In addition to the hydraulic cylinders 14, an additional hydraulic cylinder 16 is arranged centrally. It can be seen from the hydraulic circuit diagram in accordance with FIG. 2a that the hydraulic cylinders 14 are connected to one another in a similar manner to that already known from the prior art (cf. FIG. 1a). In addition to the hydraulic cylinders 14, an additional hydraulic cylinder 16 is provided whose piston side 18 is connected to a hydraulic accumulator 20 which can, for example, be a piston accumulator or a bladder accumulator.

[0022]As can be seen from the hydraulic circuit in accordance with FIG. 2a, the additional hydraulic cylinder 16 is independent of the hydraulic cylinders 14. The ...

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Abstract

The invention relates to an excavator or to a machine for material transfer comprising an element movable via at least one hydraulic cylinder. In accordance with the invention, one or more hydraulic cylinders are additionally hinged to the element, with the additional hydraulic cylinder(s) being connected to one or more hydraulic accumulators.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001]The present application is a continuation of co-pending U.S. application Ser. No. 11 / 175,753 filed Jul. 6, 2005.BACKGROUND OF THE INVENTION[0002]The invention relates to excavators and to machines for material transfer comprising an element movable via at least one hydraulic cylinder.[0003]With excavators and machines for material transfer such as excavators, wheel-mounted loaders and similar plant, a boom and / or a shaft are moved e.g. via two parallel hydraulic cylinder pairs. In the case of an excavator, an attachment tool is then attached to the shaft and the good to be loaded is transferred with it. Both the boom and the shaft and the attachment tools naturally have masses. This means that only a small part of the energy used for the lifting work benefits the lifting of the load. The much greater part must be used for the lifting of the equipment and of the attachment tool.[0004]A detail of an excavator and of machines for material ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F15B1/04F15B11/16
CPCE02F9/2217F15B21/14F15B1/024
InventorASAM, DIRKMIEGER, ROLFWACHTER, ROLANDWAGER, BERND
OwnerLEIBHERR HYDRAULIKBAGGER GMBH