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. 28, 2000
Filed:
Feb. 16, 1999
Bernd-Eric Lubbing, Eberbach, DE;
Rudiger Schafer, Mutterstadt, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
In a cylinder with a cylinder surface receiving a piston the cylinder surface has at least two zones with different oil retention capabilities; sectors having a relatively high oil retention capability are disposed in areas of the cylinder surface which are subjected to relatively high radial pressure forces while the other areas have only a relatively low oil retention capability. The oil retention sectors have a width which changes over their axial length so as to provide only a surface area with increased oil retention capability as needed to accommodate high radial pressure forces of the piston while the rest of the cylinder surface has a low oil retention capability to eliminate unnecessary oil consumption and engine emissions.