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3.6 Tapered Bush
All the types of tapered bushes produced as standard by many manufacturers work by converting axial movement into a clamping force. The type illustrated is perhaps most common, although double tapered rings which are forced together axially are also common. Tapered bushes should be regarded as similar to clamping in most respects but will provide much larger torque. Stress concentration effects are similar to those quoted for press and shrink fits with kf = 1.34. One further type of connection, the tapered shaft, is commonly used for fixing flywheels on engines.
There are a large variety of types of bushes that grip the shaft and hub using a taper.One patented type consists of an inner and outer sleeve with matching opposite tapers. The inner sleeve is threaded, and a single nut, when turned, causes the unit to expand. The advantages of this type over other keyless bushings include speed of installation and self-centring since its axial length is greater than its outside diameter and the tightening motion is perpendicular to the shaft so it is easier.