FIELD: mechanical engineering; internal combustion engines, pumps, compressors and other machines. SUBSTANCE: coaxial or connected shafts are installed in housing ring. Ring working chamber is made triangular in cross section, two side walls of chamber being rigidly coupled with shafts and third wall being formed by housing ring. Piston are arranged and secured on side walls. Pistons can be furnished with spring-loaded sealing members installed in piston grooves and made in form of V-shaped strips whose ends are fitted in recesses made in walls. Proposed shape of working chamber and design of sealing members provide sealing of working chamber. EFFECT: enlarged operating capabilities. 3 cl, 2 dwg
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