Patent ID: 8662050

Claim:
An elastic fixing for a piston ( 2 ) of a variable compression ratio engine ( 10 ), said piston ( 2 ) being securely attached in its bottom part to a transmission member ( 3 ) which cooperates on the one hand with a guiding device with rolling bearing ( 4 ), and on the other hand with a toothed wheel ( 5 ) securely attached to a link rod ( 6 ) in order to ensure the transmission of the movement between said piston ( 2 ) and said link rod ( 6 ), characterized in that it consists of at least one metal rod ( 15 ) kept under tension between said piston ( 2 ) and said transmission member ( 3 ) and which applies a strong contact pressure between the base of said piston ( 2 ) and the top face of said transmission member ( 3 ), said piston ( 2 ) being on the one hand tightened according to a previously calculated angle enabling the metal rod ( 15 ) consisting of a stud ( 16 ) to be subjected to a desired tension force and the tightening prestress to be reached between said piston ( 2 ) and the transmission member ( 3 ) and on the other hand indexed in rotation relative to the transmission member ( 3 ), by an additional tightening which does not significantly increase the tightening prestress, said stud ( 16 ) continuing to elongate with the same tension force by plastic deformation.