Valve operating system in internal combustion engine

Details Valve operating system in internal combustion engine Valve operating system in internal combustion engine

F - Mech Eng,Light,Heat,Weapons

01

L

F01L 1/18 (2006.01) F01L 1/26 (2006.01)

Patent

CA 2221548

A valve operating system includes a connection switch- over device provided in a plurality of cam followers. The connection switch-over device has a piston moved in response to a change in hydraulic pressure in a hydraulic pressure chamber. A roller shaft is disposed on at least one of the cam followers and has a roller carried thereon to come into rolling contact with a valve operating cam. In this valve operating system, the hydraulic pressure chamber and a communication passage, which permits an oil supply passage to communicate with the hydraulic pressure chamber, are defined in a particular one of all the cam followers, which moves a smallest amount when the connection switch-over device is in its disconnecting state. The roller shaft, having the roller rotatably carried thereon, is mounted on the cam follower other than the particular one cam follower. Thus, it is possible to avoid an increase in size of the particular one cam follower, and avoid a complicated assembling operation and passage construction. Moreover, the valve operating load is reduced to a minimum by using the roller.

Système de commande de soupape comprenant un dispositif de connexion/commutation et interagissant avec plusieurs galets de came. Ce dispositif comporte un piston qui se déplace en réaction à un changement de pression hydraulique dans la chambre de pression. Au moins un des galets de came est muni d'un arbre porte-galet sur lequel est monté un cylindre venant en contact roulant avec une came commandant l'ouverture et la fermeture de la soupape. Dans le présent système, la chambre de pression hydraulique et un canal, assurant la communication entre le canal d'alimentation en huile et ladite chambre de pression, sont définis dans un des galets de came en particulier, lequel subit le plus faible mouvement lorsque le dispositif est en position d'interruption. L'arbre porte-galet, sur lequel est articulé le cylindre, est monté sur un galet de came, autre que celui définissant la chambre de pression et le canal de communication, ce qui permet de limiter la dimension du galet de came à faible mouvement et facilite l'assemblage du système de même que la construction du canal. De plus, l'utilisation du cylindre réduit au minimum la charge exercée sur la soupape.

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