FIELD: machine building.
SUBSTANCE: proposed device comprises elastic tapered ring (12) embracing core (9) with shaped working surface. Aforesaid ring (12) is partly, over it height, arranged in housing (1) furnished with circular ledge on inner surface in contact with outer surface of ring (12). In compliance with the first version, total area of ring bulge surfaces exceeds that of the rings arranged outside the housing provided that total bulge area, when ring deforms inside the housing, exceeds that when the ring deforms outside the housing. In compliance with the second version, each of section, passing through central axis of symmetry of the ring, features resultant force, acting on the former passes through the housing circular ledge.
EFFECT: longer life.
6 cl, 1 dwg
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