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Welcome to Stoffel Polygon Systems, Inc.
Polygon drive connections go back in history to the stone ages,
when shafts and wheels were hand crafted with polygon shapes,
and fitted together for transmitting torque. The polygon drive
connections remained in mind of design engineers, until they were
developed by Austria, during the WWII, then they were transferred
to Germany, and France. In Germany, the DIN Standards included
data for three-and four- sided metric polygon connections (Din
32711 & 32712). These Standards data were converted to inch dimensions,
and introduced to the United States by Stoffel Polygon Systems,
Inc. and were published in the 23rd Machinery's Hand Book and
its later editions. |
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Polygonally shaped shafts and bores present many advantages
in applications calling for fixed or sliding drive connections.
These advantages stem primarily from greater load carrying capacities
for a given length and diameter of connection as compared to splines,
keys, flats, or other common drive connection arrangements. On
sliding drive connections, they provide for smoother movement
with less allowance for sliding clearance, reducing backlash and
being capable of withstanding greater shock loads under extreme
torque reversal conditions, such as occur on brakes, transmissions,
etc
Polygons, The Ultimate Strength of Drive Connections
It will be readily seen that polygon systems provide the highest
torque carrying capacity, within the shaft diameter, of any drive
connection now known. This has been demonstrated by torsion bar
test to the failure point as illustrated in the photo below.
 
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