Belts & Pulleys

Plain metal belts are created by welding together two ends of a metal tape to form an endless belt.High-energy beam-welding techniques, pioneered in the space program, form a high-integrity butt weld that is extremely strong and smooth.Friction drive pulleys are generally flat-faced with no timing element. Crowning pulley faces is not generally recommended. A full radius crown is less stressful on the belt, but is more difficult to machine and, therefore, more costly. The trapezoidal crown is more cost effective, but it should be avoided in applications having high belt tensile loads due to stress risers at the crown’s transition points between angled flats. Blending these points can be helpful but does not eliminate the high-stress risers.

Polyurethane  timing  belts  are  used  across  a  very  wide  range  of  applications  for  the  transmission  of  synchronous  rotary  motion  in  power transmission systems, servo and motion controls, con-veyors  and  transfer  lines.  They  operate  in  a  rotational  speed range of up to 20,000 rpm.

Pulley tooth design versions available

Selecting a special pulley tooth gap can increase the accuracy of the timing belt system by decreasing or eliminating  “play” between the timing belt and the pulley. Linear drives and systems requiring precise positioning and high repeatability or fast settling times can benefit from reduced “play”.  The illustrations show the meshing of the timing belt with the tooth gap designs available for metric pitches. For drive designs using “SE” or “0” – tooth gap pulleys.