Geometrical instruments – Area integrators – Electrical
Patent
1983-02-18
1984-10-02
Little, Willis
Geometrical instruments
Area integrators
Electrical
33147K, 33149J, 33180AT, G01B 714
Patent
active
044739508
ABSTRACT:
A remote reading crankshaft alignment tool utilizes a differential transformer and live centers to measure the deflection of crankshaft webs as a function of crankshaft angle. The tool is positioned between adjacent webs to measure the difference in spacing between preset points on the crankshaft webs as the crankshaft is rotated, with any misalignment resulting in a difference in output as the crankshaft is rotated. The live centers are in the form of conical-shaped feelers mounted in bearings, with the live centers fitting into punch marks in opposing webs. In one embodiment, one feeler is fixed with respect to the tool body and the other is spring-loaded and slidably mounted in the tool body. An extension of the slidably mounted feeler includes a ferromagnetic coupling slug which is initially centered in a split-winding differential transformer within the tool. Web deflections are measured by the differential output from the transformer as the crankshaft is rotated, with the tool being maintained in a vertical orientation by a weighted arm or handle mounted perpendicular to the longitudinal axis of the tool. The angular orientation of the crankshaft is measured through the utilization of a magnetically held plate which surrounds the fixed feeler, with the magnets securing the plate to one of the webs. The plate is mounted to a shaft which is rotably mounted to the tool housing. As the crankshaft is rotated and the tool is maintained upright by the weighted arm, the shaft rotates relative to the tool housing, with the measured shaft angle correlating to the angular position of the crankshaft. In one embodiment, the shaft is that of a potentiometer, to which a voltage is applied. The rotation of the shaft causes a proportional change in the voltage at the arm of the potentiometer.
REFERENCES:
patent: 2313989 (1943-03-01), Caldwell et al.
patent: 3820386 (1974-06-01), Grikscheit et al.
patent: 3877151 (1975-04-01), Roberts
patent: 3927476 (1975-12-01), Martin
patent: 3937271 (1976-02-01), Akiba et al.
patent: 4338726 (1982-07-01), Swailes
Finn Albert E.
Wilde Leon G.
Little Willis
The Indikon Company
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