Engine valve operating system

F - Mech Eng,Light,Heat,Weapons – 01 – L

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F01L 1/255 (2006.01) F01L 1/18 (2006.01) F01L 13/00 (2006.01)

Patent

CA 2527942

In an engine in which a lift amount of a valve can be changed continuously, an engine valve operating system including a valve lift-changing mechanism is capable of increasing and decreasing the lift amount of the valve without changing an opening angle for the valve and capable of decreasing a tappet clearance in accordance with a decrease in lift amount of the valve. Thus, it is possible to prevent the ratio of the tappet clearance to the lift amount at a low valve lift from being increased to minimize the influence of the dispersion of the tappet clearance and to reduce the seating speed of the valve at the low valve lift to prevent the generation of a noise. It is also possible to prevent a reduction in performance of the engine at a high valve lift due to the dispersion of the tappet clearance and to decrease the seating noise of the valve at the low valve lift.

Selon l'invention, dans un moteur dans lequel une force de levée de soupape peut varier continuellement, un dispositif de déplacement de soupape pour moteur, pourvu d'un mécanisme de variation de levée de soupape, permet d'augmenter et de réduire la force de levée de soupape sans modifier l'angle d'ouverture de soupape. Ce dispositif permet également de réduire le jeu du poussoir, en fonction de la réduction de la force de levée de soupape. Cela permet d'empêcher une augmentation du rapport jeu de poussoir force de levée de soupape dans une situation de faible levée de soupape, ce qui réduit au minimum les effets de la variation du jeu de poussoir ainsi que la vitesse d'appui de soupape dans une situation de faible levée de soupape, de sorte à empêcher la production de bruit. La réduction des performances du moteur dans une situation de forte levée de soupape, provoquée par la variation du jeu de poussoir est ainsi empêchée, et le bruit d'appui de soupape dans une situation de faible levée de soupape est réduit.

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