Desmodromic valve actuation system

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

Patent

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Details

F01L 1/30 (2006.01) F01L 1/34 (2006.01)

Patent

CA 2479292

A desmodromic valve actuation system for opening and closing at least one valve (33/51) of an engine having a cam assemblage (15) and a driving mechanism (35) for reciprocal movement operably connected to the cam assemblage (15). The cam assemblage (15) includes a cam mechanism (11) for rotational movement and the driving mechanism (35) also being operably connected to the at least one valve (33/51) of the engine to move the at least one valve (33/51) between a valve closed position and a valve open position and between the open position and the closed position in a manner directly related to the rotational movement of the cam mechanism (11). In addition, a mechanism (52) is provided for adjustably controlling the movement of the at least one valve (33/51) in order to provide a variable amount of opening of the at least one valve (33/51) in the open position. The opening and closing of the at least one valve (33/51) takes place without the intervention of a spring action.

L'invention concerne un système d'actionnement de soupape desmodromique destiné à ouvrir et fermer au moins une soupape (33/51) d'un moteur pourvu d'un système (15) de cames et d'un mécanisme d'entraînement (35) destiné à créer un mouvement réciproque et connecté de manière opérationnelle au système (15) de cames. Le système (15) de cames comprend un mécanisme (11) à came destiné à créer un mouvement de rotation et le mécanisme d'entraînement (35) qui est également connecté de manière opérationnelle à la/aux soupape(s) (33/51) du moteur pour actionner la/les soupapes (33/51) entre une position de soupape fermée et une position de soupape ouverte, et entre la position ouverte et la position fermée directement en rapport avec le mouvement de rotation du mécanisme (11) à came. En outre, un mécanisme (52) est prévu pour commander de manière réglable la/les soupape(s) (33/51) de façon à donner à la/aux soupape(s) (33/51) un degré d'ouverture variable en position ouverte. L'ouverture et la fermeture de la/des soupape(s) s'effectuent sans l'action d'un ressort.

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