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:
Jan. 10, 1995
Filed:
Dec. 04, 1992
Heinrich-Christian Mader, Bursheid, DE;
Albin Mierbach, Leverkusen, DE;
Wolfgang Schmelter, Leverkusen, DE;
Goetze AG, Burscheid, DE;
Abstract
A piston ring has a gap defined by ring gap faces oriented toward one another and a nominal outer radius assumed by the piston ring in a closed position in which the piston ring is in an installed state in an engine cylinder having a radius equalling the nominal outer radius of the piston ring. The piston ring has first length portions extending from both ring gap faces and having a central angle of at least 15.degree. and less than 25.degree. and second length portions immediately adjoining each respective first length portion and having a central angle of approximately 10.degree.. In the installed state the first length portions have a radius of curvature equalling the nominal outer radius and the radius of curvature of the second length portions is smaller than the nominal outer radius. By virtue of such a ring configuration, a radial pressure distribution of the piston ring in the installed state is substantially zero at the ring gap and increases in opposite directions from the ring gap to a maximum value in the second length portions. The maximum value is in excess of 200% of an average circumferential radial pressure distribution of the piston ring in the installed state.