FIELD: engine engineering. SUBSTANCE: engine has a housing with the toroidal-cylindrical working surface. A rotor is mounted inside the housing. The rotor has radial grooves wherein blades-pistons are received. The surfaces of the rotor grooves is linear in the zone of toroidal working surface. As the result, contact stresses on the contacting surfaces and their edge friction decrease significantly. EFFECT: enhanced reliability. 8 dwg
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