This standard provides an acceptable practice for
the design and selection of components for enclosed
gear drives. Fundamental equations provide for the
proper sizing of shafts, keys, and fasteners based on
stated allowable stresses. Other components are
discussed in a manner to provide an awareness of
their function or specific requirements. This standard
applies to the following types of commercial and
industrial enclosed gear drives, individually or in
combination: spur, helical, herringbone, bevel and
worm.
1.1 Exceptions
The equations in this standard are not applicable
when gear drives are subjected to vibratory conditions
where there may be unpredictable fatigue
failure.
The procedure for design or selection of the specific
gear components is varied and complex and is
beyond the scope of this standard. Designers must
refer to the specific rating or enclosed drive
standards for this aspect of drive design.
1.2 Intended use
The equations and values presented provide a
general approach to design. Deviations from the
methods and values stated in this standard may be
made when justified by experience, testing, or more
specific analysis. It is intended for use by
experienced gear designers capable of selecting
reasonable values based on their knowledge of the
performance of similar designs and the effect of such
items as lubrication, deflection, manufacturing tolerances metallurgy, residual stresses, and system
dynamics. It is not intended for use by the
engineering public at large.