The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 1979
Filed:
Jun. 10, 1976
Applicant:
Inventor:
Jean S Rouam, Marly la Ville, FR;
Assignee:
Societe d'Etudes de Machines Thermiques S.E.M.T., Saint Denis, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324219 ; 324228 ; 73-7 ; 73120 ; 33DI / ; 340 / ;
Abstract
A method for determining the degree of the wear condition of a piston ring in sliding contact with a cylinder wall of an internal combustion engine. The piston ring has a defined magnetic property which property in sliding contact with the wall may be varied by a chromium plating. The reluctance of a magnetic field of an inductive sensor located in the cylinder wall is varied as the piston ring reciprocates and wears. The reluctance variation is compared with a predetermined reference level of the magnetic property for an acceptable degree of wear for the ring.