FIELD: power-plant engineering. SUBSTANCE: machine has rotor unit including first part of rotor with first pair of pistons and second part of rotor with second pair of pistons which are mounted in spherical housing forming four working chambers. They move in pairs in swinging manner backward and forward relative to first pair of pistons. Machine is also provided with fixed guide device and guide member for second part of rotor. First part of rotor is connected with swivel shaft and second part of rotor is rigidly connected with its first part. Surface of both part are spherical. Guide device is centrally located in housing in rotor unit. It is made in form of elongated stator whose one end is rigidly secured in housing. EFFECT: enhanced reliability. 14 cl, 27 dwg
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