FIELD: engine engineering. SUBSTANCE: radial seal has radial sealing member and spring-loaded weight freely mounted in a radial groove of the rotor-piston and kinematically coupled with the sealing member trough ties. The weight is provided with groove having inclined sides and straight part at it ends. The inclined sides is converged in the direction of the rotation axis of the rotor. The end part of the groove is cinematically coupled with the ties. The sealing member is made up of a radial sealing ring. The kinematical connection of the ties and side of the weight groove are made up of rollers. EFFECT: enhanced reliability. 8 dwg
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