Measuring and testing – Fluid pressure gauge – Electrical
Patent
1982-05-03
1984-02-14
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Electrical
73119A, 73DIG4, G01L 908, G01M 1500
Patent
active
044308990
ABSTRACT:
To provide a high output signal, a strain bolt (12, 12a) is screwed (13, 13a) into a tapped bore extending through the housing wall (10), the bolt having a bore (14) extending therethrough, and a region or zone (18) of reduced outer diameter to form a comparatively thin-walled tubular or sleeve-like region which, upon application of fluid, typically liquid fuel pressure within the housing, tends to elongate the portion of the bolt of reduced wall thickness; a piezo-ceramic transducer assembly, preferably formed of two oppositely polarized disks (23, 24) is clamped between an integral head (FIG. 1: 19) or a separate clamping nut (FIG. 2: 31) and the outer wall of the housing, or an abutment surface formed by the upper surface of an intermediately positioned tightening nut (FIG. 2: 19a) so that, upon application of fluid pressure, and straining of the thin-walled portion (18) of the bolt, the bias pressure on the piezo-ceramic disks (23, 24) changes, thus providing an output signal available from a central terminal (25a).
REFERENCES:
patent: 3151258 (1964-09-01), Sonderegger et al.
patent: 3835523 (1974-09-01), Stansfield
patent: 4109518 (1978-08-01), Dooley et al.
Robert & Bosch GmbH
Woodiel Donald O.
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