388 TECHNICAL INFORMATION Abnormal Phenomena Cause Measures Abnormal Wear of Belt Side Faces · Pulley misalignment · Pulley shafts misalignments · Bent pulley flanges · Realign · Correct shaft misalignments · Correct bent pulley flanges Tooth Contact Pressure Surface Abnormal Wear · Overload · Belt tension too high, too low · Redesign with a wide belt or use larger belt pitch · Adjust initial belt tension Belt abnormal wear on pulley contacting area · Pulley tooth shape incorrect · Belt tension too high · Adjust initial belt tension · Try to recreate belt systems by taking note of tooth tip radius Broken/missing tooth · Pulley diameter too small · Small pulley meshing 6 teeth or less · Shock loading exists · Redesign · Increase small pulley tooth mesh or redesign · Avoid shock loading on belt · Increase belt width Severed Core Wire · Overload · Core wire decreased elasticity or corrosion · Induction of foreign matter · Excessive temperature · Redesign · Check belt storage and shipping history/condision · Avoid shocks · Provide a belt cover · Lower environment temperature Cracks on Backing Rubber · Usage in low temperature · Pulley diameter too small · Raise environment temp. · Increase pulley diameter Heat Degradation of Rubber · Rubber degradation due to high enviroment temperature · Lower environment temperature Rubber Swelling · Contact with oils · Contact with water · Avoid oil from contacting · Avoid water from contacting Abnormal Wear of Pulley Teeth · Overload · Belt tension too high · Pulley material too soft · Redesign · Adjust initial belt tension · Apply surface hardening treatment on pulley or change pulley material Pulley Circumference Wear · Pulley service life has been reached · Belt tension too high (core wire visible on belt back side) · Replace with a new pulley · Replace with new pulley and belt, and use lower belt tension Abnormal Sound · Belt tension too high · Overload · Pulley diameter too small · Pulley tooth shape incorrect · Realign · Adjust initial belt tension · Redesign · Correct pulley tooth geometry Apparent Belt Stretch · Shaft center distance too small · Loose machine base · Adjust to correct shaft distance · Reinforce machine base Q Early failures and countermeasures Q About Pulley Alignments Misaligned pulleys may cause early belt failure and flange damages. Align as show below В В Belt width (mm) ≤20 20 40 tan 6/1000 3/1000 Belt width (mm) ≤30 tan 5/1000 Belt width (mm) 10 20 30≤ tan 5/1000 3/1000 2/1000 t.9- 9- - ) 4@. .54@. 5 4FSJFT t1@. 61@. t@(5 &7 (5 &7 :6 Timing Belt Synchronous Belt Reference Information
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