Device for fixing a rotor on a rotatable shaft

Claim 1

In a model internal combustion engine having a crankcase and a crankshaft which protrudes from said crankcase, the improvement which comprises a tapped bore in the end of the crankshaft protruding from the crankcase, a sleeve surrounding said protruding end of the crankshaft, means defining a stepped bore in said sleeve with a larger diameter portion receiving said crankshaft and a smaller diameter portion, a shoulder between said larger and smaller diameter portions of the stepped bore abutting the end face of the crankshaft at the protruding end thereof, means defining a conical outer surface on said sleeve, means defining a slit extending longitudinally through said sleeve and extending between the stepped bore and conical outer surface thereof, a ring carried on said sleeve and having a conical bore conforming to and engaging the conical outer surface of said sleeve, a washer, a propeller received between said ring and washer, a screw extending through said washer, propeller, ring, smaller diameter portion of said sleeve and received in threaded engagement with said tapped bore to compress the propeller between said ring and washer and to thereby apply to the ring axial forces compressing and securing same against said sleeve whereby said sleeve, ring, propeller, washer, screw and crankshaft are rotatable in unison, and spacer means disposed in a clearance space between said sleeve and the crankcase to limit the bending deflection of the crankshaft portion that protrudes from the crankcase.