CYLINDER-AND-PISTON GROUP OF TWO-STROKE ENGINE Russian patent published in 2021 - IPC F02B75/30 F02B33/04 F01L5/20 

FIELD: engine building.

SUBSTANCE: invention relates to propulsion engineering, namely, to two-stroke engines with asymmetric gas distribution phases. Cylindrical piston group of two-stroke engine comprises cylinder (1), ring piston (2) installed in cylinder (1) with internal piston (3) arranged in it and equipped with bottom (4) and trunk (5). Each piston (2), (3) is connected to corresponding crank pin (6), (7) with possibility of displacement relative to cylinder (1) and coinciding at that direction of pistons (2), (3) movement, at least on part of its stroke. Pistons (2), (3) divide cylinder (1) into working and under piston cavities (15), (16). In cylinder (1) there are outlet openings (14). Ring piston (2) is connected to crank pin (6) by means of hinge, the location of which in annular piston (2) is offset from geometrical longitudinal axis (13) of cylinder, with possibility of additional reciprocal-rotary motion of annular piston (2) around geometrical longitudinal axis (13) of cylinder. Working cavity (15) is communicated with under-piston cavity (16) by blowing channels (17) made in annular piston (2), and bypass openings (18) made in trunk (5) of internal piston (3). Changing section of bypass openings (18) is performed at movement of pistons (2), (3) from lower dead point due to rotation of annular piston (2). Outlet openings (14) are arranged to change their cross-section by annular piston (2) edge.

EFFECT: technical result is higher efficiency of engine due to reduced losses of charge during blowing.

1 cl, 3 dwg