PISTON OF INTERNAL COMBUSTION ENGINE Russian patent published in 2017 - IPC F02B75/04 F02D15/04 F02F3/28 

FIELD: engines and pumps.

SUBSTANCE: piston of the internal combustion engine comprises a head (1) with grooves (2) for installing piston rings, a cylindrical cavity (6), a skirt (3), bosses with holes (5) for the piston pin and a bottom. The bottom is installed hermetically in cylindrical cavity (6) of the head and is made in the form of a cylindrical cup (7) with an elastically deformed undulating bottom (8) made of heat-resistant, relaxation-resistant spring material. Inside cylindrical beaker (7), there is a conical spring (13) made of heat-resistant, relaxation-resistant spring material. Spring (13) with its upper end abuts against elastically deformed undulating bottom (8) of the beaker. The piston bottom is further provided with a shaped rigid support disc (9) with a cylindrical skirt (10), by means of which support disc (9) is mounted and rigidly fixed to the lower belt of cylindrical beaker (7) of the bottom. A concave circular bed (11) is formed in the center of support disc (9), on which a conical spring (13) is supported by its lower end and is pressed against elastically deformed undulating bottom (8) of beaker by support disc (9). The diameter of elastically deformed undulating bottom (8) of the cylindrical bottom beaker is either equal to diameter (d₁) of the lower belt of cylindrical beaker (7), or greater than the diameter of the lower belt of cylindrical beaker (7). Along the periphery, elastically deformed undulating bottom (8) of the beaker is shaped in the shape of one crimp (14) of the bellows that adjoins the body of piston head (1) near its end and outer diameter. Under the pressure of biased spring (13), elastically deformed undulating bottom (8) of the beaker in the static state is convex. Spring (13) is compressed to such a length that the deformation of elastically deformed undulating bottom (8) of the bottom beaker under the pressure of the gases in the combustion chamber begins at the start of the first combustion phase of the working mixture. At the end of the first phase corresponding to the end of the compression process, the convexity of elastically deformable bottom (8) of the beaker is aligned in its static state under the pressure of biased spring (13), and the volume of the combustion chamber is increased to a volume at which the compression ratio of the charge corresponds to the technical characteristic of the engine. Rigid support disk (9) is made wavy and concave with a deflection along the axis of the piston equal to the maximum allowable deflection of elastically deformable bottom (8) of the beaker along the piston axis from the gas pressure at the end of the second main combustion phase of the working mixture. The undulation of elastically deformable bottom (8) of the beaker and supporting disc (9) is shaped in such a way that when elastically deformable bottom (8) of the beaker is deformed, undulating surface of the bottom (8) of the beaker encircles the undulating surface of the support disc (9). In shaped rigid support disk (9), holes are made to move the air in the deformation of bottom (8) of the cylindrical beaker from the space between support disc (9) and bottom (8) of the cylindrical beaker into the inner cavity of the piston and back.

EFFECT: providing additional turbulence of the charge in the combustion chamber and reducing dynamic loads on parts of the crank mechanism.

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