F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
F02D 13/02 (2006.01)
Patent
CA 2526183
An engine valve operating system is provided that includes a variable valve lift mechanism in which, when there is a possibility that the rotational speed of the engine might increase beyond an allowed rotational speed due to a downshift error in a manual transmission, etc., the amount of valve lift is decreased without changing the opening angle of the valve (19). By so doing, the curvature at the top of the curve of lift of the valve (19) is reduced, the inertial force applied to the valve (19) is reduced, and improper movement of the valve (19) can be prevented. Moreover, it is possible to prevent any increase in the intake air volume due to a decrease in the amount of lift of the valve (19), and prevent the effectiveness of engine braking from being degraded, thus enabling the rotational speed of the engine to be decreased and thereby preventing improper movement of the valve (19) from being promoted.
Selon l'invention, lorsqu'une erreur de rétrogradation d'un sélecteur de vitesses manuel ou autre entraîne une augmentation de la vitesse du moteur éventuellement supérieure à la vitesse admissible, un dispositif de déplacement de soupape d'un moteur doté d'un mécanisme de variation du poussoir à soupape réduit la hauteur du soulèvement sans modifier l'angle d'ouverture d'une soupape (19). Une courbure du vertex d'une courbe de soulèvement de la soupape est rendue plus petite afin de réduire la force d'inertie agissant sur la soupape (19), ce qui permet d'empêcher le mouvement irrégulier de la soupape. En outre, on empêche une augmentation du volume d'air d'admission par la hauteur réduite du soulèvement de la soupape (19) ainsi que l'inefficacité du frein moteur, ce qui réduit la vitesse du moteur et ne favorise pas le mouvement irrégulier.
Fujii Noriaki
Nakamura Katsunori
Yonekawa Akiyuki
Honda Motor Co. Ltd.
Smart & Biggar
LandOfFree
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