Valve drive for an internal combustion engine

Details Valve drive for an internal combustion engine Valve drive for an internal combustion engine

F - Mech Eng,Light,Heat,Weapons

01

L

F01L 1/02 (2006.01) F01L 1/14 (2006.01) F01L 1/24 (2006.01)

Patent

CA 2423231

A valve drive for an internal combustion engine with an elongated securing device or anti-rotation bridge which is referred to as a mounting aid (1), which device or bridge has receptacle spaces (4), arranged at intervals one behind the other, for valve tappets, a valve tappet which is embodied as a roller tappet (5) being arranged in each receptacle space (4). Said valve tappet is secured with a tappet roller directed at a cam of a camshaft and in such a way that said valve tappet can be displaced longitudinally in the receptacle space (4) at right angles to the longitudinal axis of the camshaft, and is secured against rotation by means of two parallel planar key faces (8, 9), formed on its outer surface, bearing against corresponding inner surfaces (7) of the mounting aid (1). According to the invention, the mounting aid (1) has both receptacle spaces with a relatively small interval dimension of the two inner surfaces for bearing the key faces of standard roller tappets and receptacle spaces (4) with a relatively large interval dimension (11) of the two inner surfaces (7) for bearing the key faces (9) of switchable roller tappets (5).

Commande de soupape pour moteur à combustion interne doté d'un dispositif de fixation allongé, ou pont antirotation (dispositif de fixation) (1), qui comporte des espaces récepteurs (4) placés à distance l'un de l'autre pour loger les poussoirs de soupape, ainsi que d'un poussoir de soupape, en l'occurrence un poussoir à galet (5) placé dans chaque espace récepteur (4). Chaque poussoir de soupape est maintenu par un galet de poussoir orienté vers la came d'un arbre à cames de façon à ce que le poussoir de soupape se déplace longitudinalement dans l'espace récepteur (4), perpendiculairement à l'axe longitudinal de l'arbre à cames, et la rotation du poussoir est évitée grâce à deux clavettes planes parallèles (8, 9) sur la surface externe qui sont placées contre les surfaces internes correspondantes (7) du dispositif de fixation (1). Le dispositif de fixation (1) comprend des espaces récepteurs dont l'écart est relativement faible entre les deux surfaces internes de façon à fournir un appui à des clavettes de poussoirs standards ainsi que des espaces récepteurs (4) dont l'écart est relativement grand (11) entre les deux surfaces internes (7) pour fournir un appui à des clavettes (9) de poussoirs commutables (5).

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