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:
Sep. 24, 1991
Filed:
Jul. 20, 1990
Applicant:
Inventors:
Winfried Distelrath, Stuttgart, DE;
Roland-Dieter Zebli, Wurmberg, DE;
Assignee:
Dr. Ing. h.c.F. Porsche AG, , DE;
Primary Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123 / ; 1231 / ; 123432 ;
Abstract
A flow duct, particularly an intake duct in an intake system and a cylinder head of an internal-combustion engine has a defined flow profile by means of which the flow rate of the gas flow is accelerated continuously, specifically until it reaches a cross-sectional transition area of the intake duct which--viewed in the flow direction--is situated upstream of a valve stem. After that, the flow rate of the gas flow is reduced whereby a lower approach flow speed of the valve is achieved. This causes an optimized volumetric efficiency which has a favorable effect on the power and the consumption of the internal-combustion engine.