AUTONOMOUS PISTON OF BINARY INTERNAL COMBUSTION ENGINE Russian patent published in 2009 - IPC F02B75/28 

FIELD: engine and pumps.

SUBSTANCE: elastic element is excluded from composition of autonomous piston elements. Pressing of orifice to butt shelf for isolation of chambers and orifice transfer into suspended position for communication of chambers are realised due to difference of areas open for impact of actuating mediums of every chamber on both sides of orifice, when it is located on shelf on the side of discharge chamber. Orifice return to shelf in process of combustion is provided by selection of channels diameter and length, and also extent of orifice perforation. At that diameter of D orifice and bore of casing butt shelf from the side of discharge chamber D_cb are related to pressure drop Δp_av in chambers, at which chambers start communicating, provided that: Δp_av=(p_DC-p_CC)≥p_DC{(D/D_CC)²-1.0}, where: p_cc - pressure of medium that fills combustion chamber prior to transition of autonomous piston from isolation mode into mode of chambers communication. Besides, total area of channels cross sections s that perforate the orifice is selected based on the following condition: 0.01≤s/S<0.4, where S is orifice area.

EFFECT: reduction of axial size and mass of autonomous piston and is aimed at higher efficiency of binary internal combustion engine operation.

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