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Paragraph 12 : Claim 2


Claim 2.

A four-stroke internal combustion engine according to claim 1, for which the crank of the first crankshaft [4] passes through a top dead center and a bottom dead center during its rotation, in which the paired cylinders [2] [3] with parallel and close positions and the two crankshafts [4] [5] are arranged to define a minimum working space of the two crankshafts, so that a minimum compression ratio between the paired cylinders [2] [3] is obtained, and in which the variably timed transmission travels between a start-of-travel position and an end-of-travel position, the minimum compression ratio of the paired cylinders [2] [3] being obtained at the end-of-travel of the variably timed transmission and calculated according to thefollowing forrmula :

(V1 + [ V2 - Vr (α maximum) ] + ve)
(ve + Va (α maximum))
= P minimum in which
V1 = displacement of the larger cylinder [2] of the paired cylinders [2] [3].
V2 = displacement of the smaller cylinder [3] of the paired cylinders [2] [3].
ve = volume of the clearance space [40] of the paired cylinders [2] [3] required for gas transfer between the cylinders [2] [3], without excessive lamination.
(α maximum) = lead angle of the crank of the second crankshaft [5], at the end-of-travel of the variably timed transmission.
Vr (α maximum) = compressed air volume at the end-of-travel of the variably timed transmission, defined by the lead angle of the crank of the second crankshft [5], when the crank of the first crankshaft [4] is located at its bottom dead center, at the end of the intake phase.
Va (α maximum) = additional volume added to the clearance space volume [40], at the end-of-travel of the variably timed transmission, defined by the lead angle of the crank of the second crankshaft [5], when the crank of the first crankshaft [4] is located at its top dead center, at the end of the compression phase.

 

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