1. The teeth on the belt keep the camshaft drive pulleys indexed. 2. At cruising speed, the drive pulley widens and acts like a high gear. 3. On acceleration, for instance, the drive pulley will have a narrow diameter for more torque, like a low gear. 4. External sources of shaft voltage include other coupled machines, and electrostatic charging due to rubber belts rubbing on drive pulleys . 5. The aircraft had been flying at when the drive pulley to the propeller drive-shaft bolts failed in flight, reversing propeller thrust. 6. Any Vee belt's ability to drive pulleys depends on wrapping the belt around a sufficient angle of the pulley to provide grip. 7. A belt conveyor system consists of two or more pulley is called the drive pulley while the unpowered pulley is called the idler pulley. 8. The engine was modified for the enclosed scooter by having a drive pulley on the crankshaft driving a fan by means of a Vee belt. 9. An unusual feature of this system is that it incorporates " floating " inlet cam drive pulleys that are not directly keyed to the shafts. 10. The ratio was changed by expanding and contracting the drive pulley , with a low ratio of approximately 18 : 1 and a high ratio of approximately 7 : 1.
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