11-10-2012, 04:08 PM
Shafts and Axles
Shafts and Axles.ppt (Size: 2.83 MB / Downloads: 134)
Introduction
In machinery, the general term “shaft” refers to a member, usually of circular cross-section, which supports gears, sprockets, wheels, rotors, etc., and which is subjected to torsion and to transverse or axial loads acting singly or in combination.
An “axle” is a non-rotating member that supports wheels, pulleys,… and carries no torque.
A “spindle” is a short shaft. Terms such as lineshaft, headshaft, stub shaft, transmission shaft, countershaft, and flexible shaft are names associated with special usage.
Considerations for Shaft Design
Deflection and Rigidity
(a) Bending deflection
(b) Torsional deflection
© Slope at bearings and shaft supported elements
(d) Shear deflection due to transverse loading of shorter shafts
Stress and Strength
(a) Static Strength
(b) Fatigue Strength
© Reliability
Static or Quasi-Static Loading on Shaft
The stress at an element located on the surface of a solid round shaft of diameter d subjected to bending, axial loading, and twisting is