Drive Belts - Industrial and Bearing Supplies

Bosch | A 7Improved Cog Belt DesignImproved Cog belt design for 11A and 13A belt series to reduce resonant noise.Bosch is successfully introducing the new cog profile into the market to widen the range of cogged drive belts.The new design features a change from a uniform tooth profile and flat pitch to a unified profile and random pitch(across approximately 5 teeth).The new design is considerably quieter and does not produce the common resonant peak in the noise level which insome applications can be annoying to customers.ACTypical belt layoutAC = Air-conditionerALT = AlternatorCR = CrankID = IdlerTEN = TensionerWP = Water PumpALTWPIDTENVery low noise at this critical pointusing Bosch new tooth profileCRComparative DiagramsOld Tooth ProfileNew Tooth ProfileNoise outputNoise outputAs can be seen from the comparative diagrams, random cog belts do not produce a resonant peak in the noiseoutput. The peak noise is usually located on the shortest span whereas longer sections tend to have a dampeningeffect.2008 | 2009 Bosch Automotive Aftermarket