Desmodromic variable valve actuation

Abstract

The combination of the Fully Variable Valve Actuation or FVVA system with the Desmodromic control results in a fully functional FVVA rid of valve springs and any other kind of the restoring springs of the art.

1 . A desmodromic mechanical valve train system for the control of the motion of a valve of an engine, characterized in that the valve lift profile is variable according the state of at least one control member, thereby a desmodromic variable valve actuation system is provided. 
   
   
       2 . A mechanical variable valve actuation system for the control of a valve of an engine, characterized in that the valve motion is controlled desmodromically. 
   
   
       3 . As in  claim 1  wherein a first control member and a second control member provide independently variable valve lift and valve duration. 
   
   
       4 . As in  claim 2  wherein the variable valve actuation system is a fully variable valve actuation system providing independently variable valve lift and valve duration. 
   
   
       5 . As in  claim 2  wherein an eccentric pin rotates or reciprocates or oscillates in synchronization with the engine, said eccentric pin, via a connecting rod, displaces a roller, said roller is in substantially simultaneous abutment to two control surfaces of a control member, said two control surfaces have form and location such that, in combination with the connecting rod action, force the roller to perform a desmodromic motion, said roller imparts, via another connecting rod, its motion to the valve. 
   
   
       6 . As in  claim 2  wherein an eccentric pin rotates or reciprocates or oscillates in synchronization with the engine, said eccentric pin, via a connecting rod, displaces a roller, said roller is in substantially simultaneous abutment to two control surfaces of a control member, said two control surfaces have form and location such that, in combination with the connecting rod action, force the roller to perform a desmodromic motion, said two control surfaces include a lost motion part and an actuation part, said roller imparts, via another connecting rod, its motion to the valve. 
   
   
       7 . A mechanical constant duration variable valve actuation system for the control of the valve lift of a valve of an engine, characterized in that the valve motion is controlled desmodromically. 
   
   
       8 . As in  claim 7  wherein an eccentric pin rotates or reciprocates or oscillates in synchronization with the engine, said eccentric pin, via a connecting rod, displaces a roller, said roller is in substantially simultaneous abutment to two, substantially immovable relative to the engine, surfaces, said two control surfaces have form and location such that, in combination with the connecting rod action, force the roller to perform a desmodromic motion, said two control surfaces include a lost motion part and an actuation part, said roller imparts, via another connecting rod, its motion to the valve. 
   
   
       9 . As in  claim 2  wherein a reciprocating or rotating or oscillating pin, via a connecting rod, actuates desmodromically a constant duration mechanism which in turn actuates desmodromically a lost motion mechanism, which in turn actuates desmodromically the valve.