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Detachable Fastenings for Shaft and Hub
Nomenclature
l working length of a key, mm
T torque, N mm
b key width, mm
d shaft diameter, mm p bearing stress, MPa
F force acting on a key, N [ ] allowable bearing stress, MPa
p
h key height, mm shear stress, MPa
L length of a key, mm [ ] allowable shear stress, MPa
4.1 Keys
4.1.1 Applications, Characteristics and Structure
When power is to be transmitted to, or supplied from a rotating shaft, it is necessary to
attach power transmission elements, such as pulleys, sprockets or gears, to the shaft. The
relative rotation between the shaft and the attached elements are prohibited. Detach-
able retention devices, such as keys, splines and pins, are commonly used to secure the
connection between the hub of power transmission elements and the shaft.
Analysis and Design of Machine Elements, First Edition. Wei Jiang.
© 2019 John Wiley & Sons Singapore Pte. Ltd. Published 2019 by John Wiley & Sons Singapore Pte. Ltd.
Companion website: www.wiley.com/go/Jiang/analysis_of_machine_elements
