Special-purpose coupling
A flexible coupling designed and manufactured
for a specific application. It must operate under special
conditions (high torques, angles, axial or speed) or is required to
operate continuously for extended periods. Special-purpose couplings
are critical to the continued operation of the installation.
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Spline bore
A series of parallel keyways formed internal with the
bore and mating with the corresponding grooves cut in a shaft.
Splined hubs and shafts are used when relatively heavy torques are
to be transmitted. The most common splines conform to standards
published by SAE and ANSI and are in the form of involutes or
straight, parallel sides
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Static unbalance
That condition of unbalance in which the central
principal axis of inertia is displaced only parallel to the shaft axis.
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Service factor (S.F.) (Application factor)
A factor that accounts for
unusual and occasional loading.
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Shaft penetration factor
The percentage of the shaft length within
the confines of the hub that is, for the purpose of calculating torsional
rigidity, assumed to be free from restraint at the shaft/hub
interface.
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Shear elastomeric coupling
A coupling that transmiter torque
through an elastomeric element that is principally loaded in shear.
The element may be in the form of a type, a bellows (with one or
more convolutions), or a diaphragm. A single elastomeric element
is usually able to accommodate angular misalignment, parallel
offset, and axial displacement.
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Single-engagement (single flex) coupling
A coupling that has only
one flexing plane. This type of coupling can accommodate angular
misalignment and axial displacement. Certain types of singleengagement
couplings can also accommodate offset misalignment.
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Sliding block coupling
A coupling that consists of two jawed (slotted)
hubs engaged with a mating center member. (“Sliding block”
is the preferred term for what was formerly called an Oldham coupling.)
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Stress Relieving
Heating to a suitable temperature, holding long enough to reduce residual stresses, and then
cooling slowly enough to minimize the development of new residual stresses.
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Subcritical Annealing
A process anneal performed on ferrous alloys at a temperature below Ac1.
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