Earthmoving machine

Details Earthmoving machine Earthmoving machine

1987-03-17

1988-09-27

Look, Edward K.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60487, 60488, 60494, 404133, F16D 3102, E01C 1938

Patent

active

047732172

ABSTRACT:
An earthmoving machine comprises a first system for moving the machine, a second system for moving a mobile part of the machine, and an actuator device for the first or second system. The actuator device comprises a variable flowrate pump and a mechanism for adjusting the flowrate of the pump. A ram is mechanically coupled to this mechanism, and a hydraulic control circuit controlling the pump comprises a control pressure generator, an actuator member coupled to the generator and a variable ratio pressure divider connected between the generator and the actuator member. The first or second system comprises at least one control member adapted to be actuated by the actuator member when the actuator member has moved a predetermined distance beyond a neutral point.

REFERENCES:
patent: 3964834 (1976-06-01), Paramythioti
patent: 4184334 (1980-01-01), Orth
patent: 4310261 (1982-01-01), Opderbeck
patent: 4400939 (1983-08-01), Moranduzzo et al.
patent: 4458485 (1984-07-01), Seelmann

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