FIELD: machine building.
SUBSTANCE: working member is presented as pairs of rotors (1, 2) with spiral teeth (8, 11) being engaged. The rotors are placed in the cavities (6 and 7) embracing them. Working areas of the teeth (11) profiles in the engaged pair in the end face section are limited by the sections (12) of a cycloidal curve (13) for one rotor and archs (9) of circles (10) shifted from the second rotor axis eccentrically. Such teeth profile forms eccentric-cycloidal engagement.
EFFECT: increased permissible rotor speeds and expanded range of working media properties.
2 cl, 10 dwg
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