ANALYSIS OF THE LOAD ON EACH TOOTH OF A 4-CYCLE GASOLINE-ENGINE CAM PULLEY

Synchronous drive belts are used in driving car engine camshafts and o ther mechanisms. Load was measured on each tooth root of a cam pulley engaged with a synchronous drive belt with rounded teeth used with a f our-cycle gasoline engine, and then was the dimensionless load distrib ution ratio calculated by dividing the tooth root load distribution by the belt tension load. Thus, the relationship between the distributio n ratio with engagement position load and the belt tension load was an alyzed. As the result of this study, the following conclusion reached : When material properties, tooth profiles and other specifications ar e the same, under both dynamic and static loads, the tooth load distri bution ratios of pulleys with rounded teeth used to drive engine camsh afts are almost the same as the speed range adopted in the operation o f production car engines.