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The Rocom’s one piece, double taper, multi overlapping, curved beam flexible coupling is the patented result of years of testing. The beams are double tapered so that they are thick at the OD and thin at the ID in ratio to the circumferential lengths. They are thick at the hub end of the beam and thin at the circumferential center forcing the flexing to the center of their lengths, instead of the end where the highest stress would occur. The thick OD increases strength without sacrificing life.
The space between the beams is calculated and cut to allow
the beams to flex without touching each other at their
maximum misalignment rating. All thru bore couplings have
an inside diameter relief in the flexible area. If the
misalignment rating is not exceeded the shaft cannot touch
the flexible beams which otherwise could cause them to
fail.
This design is continually self-compensating. When the
coupling is in a misaligned condition, one set of three
beams flex toward each other without touching, and are at
their maximum load capability. On the other side of the
coupling, the second set of beams are spread apart to
their minimum load carrying capability. The second set of
beams are 180° out of phase with the first set. This
continually averages the torque load and velocity between
all six beams and does not allow the coupling to have a
sine wave output on each revolution. Tests by our
customers show when these couplings are installed
correctly they have a constant velocity.
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TORQUE AND TORSIONAL STIFFNESS
The torque rating is based on the buckling point not on
the breaking point of the beam. Once the material exceeds
its elastic limits (the buckling point) it will fatigue
and fail. The beams are less than 360° long at the ID.
Beam length, thickness and height (OD to ID), plus
material determines the torque and torsional stiffness.
The beam designs can be modified for special requirements.
MANUFACTURING
The method of cutting six short overlapping double tapered
curved flexible beams is complex and took several years to
develop. Six steel hollow ground jeweler saws must all be
bent into exactly the same compound curve, all cut at the
same time and hold a tolerance of .025 mm, .001 inch
thickness beam to beam. The thickness of the blades range
from .20 to .90 mm, .008 to .035 inch, depending on the
size of the couplings.
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