Patent ID: 6631657
Filing Date: 2003-10-14
Classification: F01L,Y10T

Abstract:
Peripheral cam for a valve-controlled internal-combustion engine, comprisingan opening flank with a cam contour configured to generate at least one positive acceleration course in a valve opening area, with an opening acceleration course having first and second acceleration curves with acceleration peak values of different amounts spaced by way of an intermediate curve of positive acceleration lower than the first and second acceleration curves, wherein the first acceleration curve has a peak value of approximately 40 to 60% of a peak value of the adjacent second acceleration curve set at 100%, an ascending curve section of the first acceleration curve and a descending curve section of the second acceleration curve each respectively intersecting with a zero acceleration line, and a distance between respective connection points of the descending curve section of the first acceleration curve and of the ascending curve section of the second acceleration curve with the intermediate curve corresponding to an amount of about 10 to 15% of the distance between the intersections at the zero acceleration line of the first and second acceleration curves.