Hydraulic excavator machine having self-contained electrohydraul

Details Hydraulic excavator machine having self-contained electrohydraul Hydraulic excavator machine having self-contained electrohydraul

1978-05-17

1980-03-18

Paperner, L. J.

Material or article handling

Vertically swinging load support

Shovel or fork type

60DIG10, 92146, E02F 922

Patent

active

041937333

ABSTRACT:
A large mobile self-propelled excavator machine comprises an upper section on which a plurality of movable components, such as a boom, stick, and shovel, are mounted. A plurality of self-contained independently operable electrohydraulic power units are provided, one for each movable component, and each power unit comprises a housing, a pair of hydraulic rams mounted on the housing, means for pivotally connecting the housing and the ram piston rods to their associated components, a fluid reservoir in the housing, a reversible main pump in the reservoir for supplying the rams, auxiliary pumps on the housing, an electric motor on the housing for driving the pumps, and solenoid valve control means on the main pump. Each power unit is supplied with electric power for its electric motor by a cable from a generator on the upper section of the excavator machine. The solenoid valve control means on each main pump is operatively connected by a cable to the operator's control station on the upper section of the excavator machine.

REFERENCES:
patent: 1690181 (1928-11-01), Sederholm
patent: 2517813 (1950-08-01), Wallace
patent: 2756563 (1956-07-01), Bohlman et al.
patent: 3608742 (1971-09-01), Adolfsson
patent: 3840132 (1974-10-01), Howells et al.
patent: 3902318 (1975-09-01), Becker et al.
patent: 3928969 (1975-12-01), Picker
patent: 3940930 (1976-03-01), Rosander
patent: 3979909 (1976-09-01), Meyer et al.
patent: 4041703 (1977-08-01), Knapp

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