Cylinder internal-pressure sensor for engine
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United States of America Patent
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Dec 23, 2014
Issued Date -
N/A
app pub date -
Mar 29, 2012
filing date -
Mar 31, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A cylinder internal-pressure sensor is provided with a housing unit 2 composed of an outer cylinder portion 2e and an inner cylinder portion 2i having elastic portions 2es and 2is having elasticity in an axial direction Fs formed on an intermediate portion Xm in the axial direction Fs; a pressure-receiving ring block portion 3 hermetically fixed between the outer cylinder portion 2e and the inner cylinder portion 2i located on the fronts of the elastic portions 2es and 2is and faced with the rear of the elastic portions 2e and 2i through the elastic portions 2e and 2i and having a front surface 3f as a pressure receiving surface; at least one or more pressure detection elements 5a, 5b, 5c, . . . in contact with one electrode portion 4 provided on a rear surface 3r of this pressure-receiving ring block portion 3, given the internal pressure Pc by the pressure-receiving ring block portion 3 and arranged at predetermined positions in a peripheral direction Ff; and a support ring block portion 6 fixed between the outer cylinder portion 2e and the inner cylinder portion 2i, having a front surface 6f as a support surface supporting the pressure detection elements 5a . . . and serving also as the other electrode 7.
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