Internal-combustion engine

1. An Internal-combustion engine, the crank mechanism of which comprising:

a cylinder block, as a fixed part, that consists of cylinder banks and a crankcase;

pistons with a piston pin, one per cylinder, as an initial segment of the crank mechanism, moving progressively due to thermal energy of combustion of fuel inside the cylinders;

a crankshaft as a terminal segment of the crank mechanism, rotating in bearings in the crankcase of the cylinder block;

guides and duplex guides that are rigidly secured to the lower plane of the cylinder banks of the cylinder block and are lined up face to face lengthwise the cylinder bank;

connecting rods, each one coming with each corresponding piston, with the aid of which the progressive motion is converted to the rotation of the crankshaft;

sliders, each one coming with each corresponding piston, that are piston-actuated, move in the corresponding guides and duplex guides coaxially with the said pistons, actuate the corresponding connecting rods and are assigned to take lateral force from the said connecting rods;

auxiliary connecting rods (AC-rods), each one coming with each corresponding piston, to connect the said pistons with the corresponding sliders.

2. The Internal-combustion engine as defined in claim 1 , in which the guides have one face and one back surface and are positioned at the ends of the cylinder bank beyond the end cylinders.

3. The Internal-combustion engine as defined in claim 1 , in which the duplex guides have two oppositely oriented faces and are positioned between two adjacent cylinders of the cylinder bank.

4. The Internal-combustion engine as defined in claim 1 , in which the guides and duplex guides have a square shoot on the faces of the guides and duplex guides and the said square shoot extends along the longitudinal axis of the cylinder.

5. The Internal-combustion engine as defined in claims 1 - 4 , in which the slider is a hollow pin and has needle bearings on its both ends, and the said slider rolls by the said couple of needle bearings in the square shoots of the corresponding guide and- duplex guide pair in the case the said slider corresponds to end cylinder piston, and rolls in the square shoots of the corresponding couple of duplex guides in the case the said slider corresponds to between cylinder piston.

6. The Internal-combustion engine as defined in claim 5 , in which the slider taking a lateral force during each stroke abuts and rolls by each of two needle bearings on one of two parallel opposite side planes of the square shoot of the corresponding duplex guide, and guide, without touching the other side plane as there is a clearance between a needle bearing and the said two parallel opposite side planes.

7. The Internal-combustion engine as defined in claim 6 , in which the said clearance between the needle bearing and the said two parallel opposite side planes is small enough not to involve lateral displacement of the slider and, consequently, not to create lateral loads on the piston.

8. The Internal-combustion engine as defined in claim 1 , in which the AC-rod is pivotally connected to the piston pin and pivotally connected to the slider.

9. The Internal-combustion engine as defined in claim 1 , in which the connecting rod is pivotally connected to the slider and pivotally connected to the journal of the crankshaft.

10. The Internal-combustion engine as defined in claim 1 , in which due to the absence of the lateral component of the force on the piston, the latter is made in a lightened version without a skirt and with two compressing rings in one groove.