Optics: measuring and testing – Oil testing
Patent
1977-05-04
1979-10-02
Corbin, John K.
Optics: measuring and testing
Oil testing
73 64, 73432PS, G01N 3328, G01N 1504
Patent
active
041696778
ABSTRACT:
A method and apparatus are described for diagnosing the condition of oil-wetted parts subject to wear, wherein a specimen of the used oil from the part is extracted, and a plurality of samples are separated according to the different mobility rates of its particles through a liquid medium during the centrifuging of the specimen through the liquid medium for a predetermined period of time. The samples are then analyzed to determine their compositions, thereby providing an indication of the identities of the wearing parts and their rates-of-wear. In one described embodiment, the specimen is centrifuged for a sufficiently long predetermined time to stratify the particles according to size and density; and in a second described embodiment, the specimen is centrifuged for a plurality of short predetermined time periods during each of which a sample of the particles passing the complete length of the liquid medium is removed and analyzed. In both embodiments, the samples are separated by passing them through a large mesh screen at the bottom end of the holder in which the centrifuging is effected.
REFERENCES:
patent: 1232104 (1917-07-01), Sharples
patent: 2450603 (1948-10-01), Lomasney
patent: 2817970 (1957-12-01), Whitby
patent: 2956434 (1960-10-01), Donoghue
patent: 3091124 (1963-05-01), Hindman
patent: 3955423 (1976-05-01), Ohringer
patent: 3981584 (1976-09-01), Guymer
ASTM "1965 Book of ASTM Standards" Part 17, ASTM Designation: D893-607, Tentative Method of Test for Insolubles in Used Lubricating Oils, pp. 362-366.
Spinco, "An Introduction to Density Gradient Centrifugation" Spinco Tech Reviews, 1960, Beckman Inst. Co. Spinco Div., Palo Alto, Calif. pp. 1-27.
Barish Benjamin J.
Corbin John K.
Panel Laboratories Ltd.
Punter Wm. H.
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