Patent ID: 6058896
Filing Date: 2000-05-09
Classification: F01L

Abstract:
A variable valve control for a valve operating mechanism of an internal combustion engine including at least one inlet valve and at least one outlet valve, an inlet-outlet cam shaft including an inlet valve opening cam for controlling the opening time of the inlet valve and an outlet valve operating cam for operating the outlet valve, an inlet valve closing camshaft whose angular position relative to the inlet-outlet camshaft is adjustable, said inlet valve closing camshaft having an inlet valve closing cam for controlling the closing time of said inlet valve, an inlet valve operating lever pivotally supported adjacent said inlet valve opening cam and said inlet valve closing cam to operate said inlet valve, and an outlet valve operating lever pivotally supported adjacent said outlet valve operating cam for transmitting the control motion of the outlet valve operating cam to said outlet valve, said inlet valve closing cam and said outlet valve operating cam having center planes spaced from each other by a distance which is smaller than the sum of half the width of said outlet valve operating cam and half the width of said inlet valve closing cam, and said outlet valve operating and said inlet valve closing cams having overlapping top portion circles that is circles centered on the respective cam axis and extending through the highest radial portion of the respective cam, said outlet valve operating cam and said inlet valve closing cam being so arranged that the highest radial portions of one of said outlet valve operating cam and said inlet valve closing cam is directed toward the other cam when the highest radial portion of the other cam is directed away from the one cam, and said outlet valve operating cam being dimensioned so that, in an axial projection of the cam shaft, said outlet valve operating cam is disposed within the contour of said inlet valve opening cam.