Variable displacement hydraulic control with override
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United States of America Patent
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Jul 24, 1984
Grant Date -
N/A
app pub date -
Oct 27, 1981
filing date -
Oct 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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