Variable displacement hydraulic control with override

Details Variable displacement hydraulic control with override Variable displacement hydraulic control with override

1981-10-27

1984-07-24

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Full range correspondence of position of external...

60390, 60444, 60448, F16D 3102

Patent

active

044611471

ABSTRACT:
In the preferred form, the invention disclosed herein provides a single servo control valve to modulate the flow of control fluid to a servo mechanism of a variable displacement pump wherein the single valve is provided with both a manual primary input and an electro-hydraulic secondary input which modulates the primary input. The servo valve is spring biased toward a neutral position with the manual input displacement command being applied to such servo valve through a resilient linkage. Also applied to the servo valve is a hydraulic signal which is electrically controlled to modify the displacement of the servo valve relative to the yieldably applied manual input.

REFERENCES:
patent: 3212263 (1965-10-01), Hann
patent: 3365886 (1968-01-01), Moon
patent: 3603084 (1971-09-01), Okazaki
patent: 3650108 (1972-03-01), Isaac
patent: 3746115 (1973-07-01), Bosch
patent: 3901031 (1975-08-01), Knapp et al.
patent: 3943715 (1976-03-01), Miyao et al.
patent: 3978668 (1976-09-01), Nonmenmacher
patent: 4351152 (1982-09-01), Reynolds
patent: 4364230 (1982-12-01), Holmes

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