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:
Feb. 12, 2013
Filed:
Jul. 22, 2010
Rodney E. Baker, Fenton, MI (US);
Roxann M. Bittner, Bloomfield Hills, MI (US);
Brian W. Geiser, Ortonville, MI (US);
Pamela A. Sinnott, Macomb, MI (US);
Rodney E. Baker, Fenton, MI (US);
Roxann M. Bittner, Bloomfield Hills, MI (US);
Brian W. Geiser, Ortonville, MI (US);
Pamela A. Sinnott, Macomb, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A central direct injection (DI) cylinder head is configured with an intake valvetrain and an exhaust valvetrain separated by an uncovered central DI valley. The uncovered central DI valley limits oil flow from the high side chamber to the low side chamber and PCV transfer. Oil drainage and additional PCV transfer between the intake and exhaust chambers is provided by drain/vent passages integrally cast into the casting of the cylinder head. The drain/vent passages may be of varying configuration, and may be located between an injector port of a first cylinder set and a spark plug port of an adjacent cylinder set, or at either or both ends of the cylinder head. A method is provided to form a casting of the cylinder head as described herein, including casting of a plurality of drain/vent passages between the first chamber and the second chamber of the cylinder head.