Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Cleaning or foaming ability
Patent
1982-05-17
1984-05-01
Goldberg, Gerald
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Cleaning or foaming ability
G01N 1114
Patent
active
044453655
ABSTRACT:
A rotational viscometer or tapered bearing simulator for testing motor oils and other fluids has a stator, a matching rotor fitting into it, and a drive shaft extending axially from the rotor. The shaft is direct-driven by a multispeed synchronous AC motor mounted on a low-friction turntable free to rotate over a limited arc. Torque experienced by the turntable is measured by a strain gage. The turntable rests on a platform which is vertically adjustable by and cantilevered from a fine screw-equipped elevator bracket. For temperature control, the stator is embedded in thermally insulating material and surrounded by an electric heating coil and a passageway through which air may flow. The stator and rotor have closely matched parallel surfaces produced by fine grinding. The rotor may have flats modified with a small fillet to entrap any minute particles in the test fluid. A pre-load assembly including weights applies measured torque to the turntable to calibarate and help stabilize the instrument.
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patent: 2027903 (1936-01-01), Dintilhac
patent: 2305531 (1942-12-01), Hurndall
patent: 2807160 (1957-09-01), Asbeck
patent: 2907563 (1959-10-01), Verde et al.
patent: 3350922 (1967-11-01), Kim et al.
patent: 3456494 (1969-07-01), Zimmer
patent: 4077251 (1978-03-01), Winter
E. M. Barber et al., "A High Rate of Shear Rotational Viscometer", Analytical Chemistry 27, 425-429 (1955).
W. C. Pike et al., "A Simple High Shear Viscometer" etc. Soc. Auto. Engineers (SAE), Publ. 780981 (1978), Reprinted at SAE-SP-343, at p. 47ff.
R. M. Stewart et al., "Proposed Laboratory Methods for Predicting the Low Temperature Pumpability Properties of Crankcase Oils" SAE Publ. 730479 (1973).
Goldberg Gerald
Roskos Joseph W.
Yates William Miller
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