Power has to be overcome the restraining forces caused by the deformation of road surfaces and the interaction of friction scrub when tractive effect is applied. Secondary causes of rolling resistance are wheel bearing, oil seal friction and the churning or the oil in the transmission system. It has been found that the flattening distortion of the tyre casing at the road surface interface consumes more energy as the wheel speed increases and there fore the rolling resistance will also rise slightly as shown in figure above. Factors which influence the magnitude of rolling resistance are the laden weight of the vehicle, type of road surface and the design, construction and materials used in the manufacture of tyre. The magnitude of the rolling resistance is dependent upon:
• Tyre construction, ply rating and type of rubber
• Temperature
• Inflation pressure
• Load carried
• Speed
• Slip angle
• Torque transmitted (tractive or braking force)
• Tread thickness
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Sunday, May 16, 2010
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