FIELD: engine engineering. SUBSTANCE: piston unit has a piston made of outer 4 and inner 9 sleeves. Sleeve 9 is pivotally connected to rod 5 of the piston and provided with longitudinal passages 14 for communication of space 12 with pulsating source of compressed air, i. e. under-piston space of the engine. Bottom of the outer sleeve from the side of space 12 can be provided with ribs. EFFECT: improved design. 3 cl, 1 dwg
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