Difference between open belt drive and cross belt drive

 


Open Belt DriveCross Belt Drive
In open belt drive, the belt proceeds from the top of one pulley to the top of another pulley without crossing.In cross belt drive, the belt proceeds from the top of one pulley to the bottom of another pulley and thus crosses itself.
Here the entire belt remains in same plane in every rotation.Here belt bends in two different planes in every rotation.
Here driver and driven shafts rotate in same direction.Here driver and driven shafts rotate in opposite direction.
Angle of wrap or contact angle between belt and pulley is always below 180°.Angle of wrap is always above 180°.
Due to smaller wrap angle, power transmission capability is also lower.Due to larger wrap angle, power transmission capability is also higher.
Length of the belt in open belt arrangement is comparatively shorter.For same pulley size and centre distance, cross belt drive requires longer belt.
Here belt does not touch itself. So no rubbing takes place. Thus belt exhibits longer life.Due to crossing between two pulleys, belt rubs against itself and thus undergoes gradual wear. Thus belt has shorter life.
In between two pulleys, belt vibrates (whips) when centre distance is more.Cross belt arrangement is free from such vibration.

 


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