Patent ID: 7090467

Claim:
A fan drive attachment assembly for a motor vehicle fan, comprising: a drive hub having an outwardly extending tapered drive shank; a fan drive having a fan shaft; the fan shaft having a mouth, and an inner wall extending inwardly from the mouth and defining an axial bore, the inner wall being tapered and frictionally engaging the drive shank; the drive shank further comprises: a tapered first portion; and a second portion tapered at a second pitch less than the taper of the first portion; the inner wall further comprises: a tapered proximal end proximal to the mouth; and an distal end distal to the mouth and tapered at a second pitch less than the taper of the proximal end; a gap forms between the drive hub and drive shaft when the inner wall frictionally engages the drive shank; and wherein the second portion and the distal end are threaded.