Patent ID: 8662785

Claim:
A shaft-gear connection comprising: a shaft ( 2 ) having a generally cylindrical external diameter; and a shrunk-on gear ( 4 ) having an internal diameter with an axial cylindrical first section ( 5 ), which is shrunk-fitted with the cylindrical external diameter of the shaft ( 2 ) by a first shrink-fit bond ( 8 ) and an exterior diameter of the axial cylindrical first section ( 5 ) supporting a plurality of external gear teeth ( 12 ), and an axial cylindrical second section ( 6 ), which is shrunk-fitted with the cylindrical external diameter of the shaft ( 2 ) by a second shrink-fit bond ( 9 ), with the second shrink-fit bond ( 9 ) being tighter than the first shrink-fit bond ( 8 ) so as to enable a greater maximum torque to be transmitted, from the gear ( 4 ) to the shaft ( 2 ), by the second shrink-fit bond ( 9 ) than a maximum torque that can be transmitted by the first shrink-fit bond ( 8 ), wherein the gear ( 4 ) and the shaft ( 2 ) have an axial intermediate section ( 7 ), located between the axial cylindrical first section ( 5 ) and the axial cylindrical second section ( 6 ), shrink-fitted to the shaft ( 2 ) by a third shrink-fit bond ( 10 ), both surface pressures between the shaft ( 2 ) and the gear ( 4 ) at the third shrink-fit bond ( 10 ) and a maximum torque that can be transmitted from the gear ( 4 ) to the shaft ( 2 ) by the third shrink-fit bond ( 10 ) are, respectively, greater than a surface pressure between the shaft ( 2 ) and the gear ( 4 ) at the first shirk-fit bond ( 8 ) and the maximum torque that can be transmitted by the first shrink-fit bond ( 8 ), and both surface pressures between the shaft ( 2 ) and the gear ( 4 ) at the second shrink-fit bond ( 9 ) and a maximum torque that can be transmitted from the gear ( 4 ) to the shaft ( 2 ) by the second shrink-fit bond ( 9 ) are, respectively, greater than the surface pressure between the shaft ( 2 ) and the gear ( 4 ) at the third shrink-fit bond ( 10 ) and the maximum torque that can be transmitted by the third shrink-fit bond ( 10 ).