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Paragraph 11 : Claim 1

Claim 1.

A four-stroke internal combustion engine having an intake phase, a compression phase,an expansion phase and an exhaust phase, said engine including :

- reciprocating pistons [6] [8], provided with self-ignition or spark ignition means ;
- two crankshafts, the first crankshaft [4] having a long-stroke crank and the second crankshaft [5] having a crank with a stroke shorter than that of the first crankshaft, said crankshafts [4] [5] being coupled at the same rotational speed via a gear train [19] [20] [21] and a variably timed transmission ;
- a number of cylinders [2] [3], arranged each above one of the two crankshafts [4] [5], said arrangement including small cylinders [3] with a displacement smaller than that of the larger cylinders [2], each larger cylinder communicating with a smaller cylinder [3] via a clearance space [40], so as to form a group of two cylinders [3] [4] in communication with each other, so as to enable gases to flow from one cylinder to the other, irrespective of the position of the pistons [6] [8] in each of said cylinders [2] [3], each piston being associated to a connecting rod [9] coacting with a crank of a crankshaft, the crank of the second crankshaft [5] coacting with the connecting rod [9] of the piston [8] in the smaller cylinder [3], and the crank of the first crankshaft [4] coacting with the connecting rod [7] of the piston [6] in the larger cylinder [2];
- a camshaft in mesh, at half speed, with the first crankshaft [4], so as to connect periodically groups of two cylinders [2] [3] with intake and exhaust pipes [11] [12] via intake and exhaust valves [13] [14], at definite moments of the four-stroke cycle, in which the variably timed transmission has a control mechanism to vary the lead angle between the crank of the second crankshaft [5] and the crank of the first crankshaft [4], by means of a hydraulic force amplifier having a controlled thrustor acting on the transmission, said transmission altering at the end of the compression phase of the piston [6] in the larger cylinder [2], the compression ratio of the engine between a minimum and a maximum, said minimum and maximum compression ratios depending on :

a ) the ratio between the displacement of the larger cylinder [2] and the displacement of the smaller cylinder [3] , and
b ) the ratio between, on the one hand, the total volume of the smaller cylinder and the larger cylinder and between , on the other hand, the volume of the clearance space [40] and an additional volume created in the smaller cylinder [3] at the end of the compression phase of the piston [6] in the larger cylinder [2], the variably timed transmission adjusting the lead angle between the crank of the second crankshaft [5] and the crank of the first crankshaft [4], so as to obtain said compression ratios, said lead angle varying between a maximun so that an angle of at least 90 is obtained between the connecting rod [9] of the piston [8] in the smaller cylinder [3] and the crank of the second crankshaft [5], at the end of the compression phase of the piston [6] in the larger cylinder [2], in order to define the minimum compression ratio, and a minimum so that the lead angle corresponds, at the end of the compression phase of the piston [6] in the larger cylinder [2], to the appropriate position of the piston [8] in the smaller cylinder [3] to create the additional volume required to obtain the maximum compression ratio, the crank of the second crankshaft [5] forming an angle with the connecting rod [9] of the piston [8] in the smaller cylinder [3].

 

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