Hydraulic cylinder end member arrangement for a piston position sensing system
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United States of America Patent
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-
Jan 5, 1999
Grant Date -
N/A
app pub date -
Feb 14, 1997
filing date -
Dec 19, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piston position sensing system with improved accuracy and reliability is achieved by electromagnetic wave coupling using the combination of: a mechanical structure that in addition to supporting the rod, provides an extension of the resonance cavity, supports the electromagnetic wave couplers and a hydraulic fluid input-output port into the extended cavity and a piston travel stop; an electronic circuitry shielded package having a high frequency section with coaxial shielded input and output conductors on opposing package sides and a lower frequency counting section having a piston position output shielded conductor and a fluid dielectric property change monitor input conductor separated from the high frequency section conductors; and, the positioning of the electronic package on the mechanical structure with the coaxial shielded input and output conductors respectively adjacent to the input and output couplers and with the hydraulic fluid input-output port positioned elsewhere around the periphery of the cylinder. The structure assures minimal high frequency conductor length, with electrical and physical damage.
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