Servo amplification system

Details Servo amplification system Servo amplification system

1983-07-18

1985-12-10

Hershkovitz, Abraham

Motors: expansible chamber type

Working member position feedback to motive fluid control

Plural input signal means for single motor valve

91376R, 91385, 91422, 91460, F15B 1316

Patent

active

045571783

ABSTRACT:
A servo amplification system is created particularly for heavy construction equipment, but has a general utility that is much broader. The system utilizes a hydraulic analog system with a separate subsystem for each dimension of motion. The operator moves the operative element, such as the backhoe bucket, of the analog replica which ordinarily would be situated in the cab of the backhoe or other piece of equipment. A small hydraulic cylinder operative in response to movement at each articulated connection of the backhoe operates a pilot valve which controls a pilot piston mechanically linked to the drive valve of the drive cylinder of the corresponding articulation in the actual backhoe. A feedback system comprising a mechanical link from the actual drive piston to a feedback cylinder and piston delivers hydraulic fluid back to the inlets of the pilot valve in such a way as to cancel the pilot orders from the initial control cylinder. The resulting action is virtually perfect analog simulation by the actual backhoe of the movements of the replica backhoe.

REFERENCES:
patent: 1065323 (1913-06-01), Gottschalk
patent: 2244296 (1941-06-01), Heinrich et al.
patent: 2992633 (1961-07-01), Stiglic et al.
patent: 3125002 (1964-03-01), McCombs, Jr.
patent: 3150489 (1964-09-01), Dewar
patent: 3408897 (1968-11-01), Hoen
patent: 3792872 (1974-02-01), Jones
patent: 4052929 (1977-10-01), Baatrup et al.
patent: 4208951 (1980-06-01), Bacardit

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