FIELD: mechanical engineering. SUBSTANCE: pressure accumulator of the engine has seat whose shape coincides with inertia type spool valve member connected to discharge hole for communication of the pressure accumulator with combustion chamber after closing the exhaust ports and two spool valve member travel limiters. Spool valve member is made for motion between limiters at acceleration of stepped piston. Seat is located in upper portion of pressure accumulator and is made in form of cylinder located in parallel with stepped piston axis. Spool valve member is made in form of cylindrical bush for reciprocating. Height of cylindrical bush is equal to 1.2 to 1.5 of height of discharge hole. Cylindrical bush is made in form of split flexible ring. EFFECT: enhanced efficiency. 3 cl, 11 dwg
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