HYDRAULIC SERVO-CONTROL OF A SERVO-CONTROLLED GEARBOX
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United States of America Patent
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Issued Date -
Feb 27, 2014
app pub date -
Feb 21, 2013
filing date -
Feb 22, 2012
priority date (Note) -
Abandoned
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Abstract
A hydraulic servo-control of a servo-controlled gearbox comprises hydraulic actuators defining chambers, a storing tank containing control fluid used by the actuators at room pressure, a hydraulic accumulator containing control fluid under pressure, a motor pump drawing the fluid from the tank and feeding it under pressure to the accumulator and solenoid valves selectively connecting the chambers to the tank and accumulator. The accumulator includes an outer housing, a piston arranged and axially slidable and mobile inside the housing and defining there a first variable-volume chamber for a gas and second variable-volume chamber for the fluid under pressure, and a limit stopper arranged at an open end of the housing, acting as a striker for the piston, and having an annular circlip and a perforated plate operatively interposed between the circlip and piston.
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