Hydraulic valve with an annular filter element secured by a helical spring
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United States of America Patent
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Feb 25, 2014
Grant Date -
Mar 14, 2013
app pub date -
Sep 13, 2011
filing date -
Sep 13, 2011
priority date (Note) -
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Abstract
A wide variety of machines have moveable members that are operated by an hydraulic actuator. For example, an internal combustion engine has a camshaft which is mechanically coupled to rotate with the crankshaft and which opens and closes cylinder intake and exhaust valves. Traditionally the camshaft timing was fixed at a setting that produced the best operation for all engine operating conditions. However, it has been recognized that engine performance can be improved if the valve timing varies as a function of engine speed, engine load, and other factors. Thus a hydraulic actuator is being used on some engines to vary the coupling relationship of the camshaft to the crankshaft. A solenoid operated valve controls the application of pressurized fluid to operate the hydraulic actuator.
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