Patent ID: 7013849

Claim:
A mechanical transmission device for a variable cylinder capacity engine comprising: at least one cylinder; a transmission member; a piston movable within said cylinder, said piston being secured at a lower part to said transmission member, said transmission member having a first small-sized rack that collaborates with a rolling guide device and a first large-sized rack that collaborates with a toothed wheel, said toothed wheel being connected to a connecting rod; a control member comprising a second large-sized rack collaborating with the toothed wheel; fixing means for fixing the piston onto the transmission member, said fixing means provide clamping preload and center the piston; connecting means that stiffen at least one of the transmission and the control member and that increase the bending strength of the teeth of the first and second large-sized racks; and lightening means for lightening the toothed wheel while preserving the rigidity and the load-bearing capacity of the toothed wheel.