Belt Auction

Regarding V-belts and drive, why V-belts is better?

1. What are the advantages and disadvantages of V-belts drives over flat belt drive? I have observed that V-belts drives is commonly used rather than flat belt drive. 2. As for the selection of a particular drive for power transmission, what would be important parameters are required ?

Public Comments

1. V-belt drives are more common because the driving wheel pulls the v-belt into the vee section of the pulley wheels, wedging the belt in and creating a much tighter grip. Flat belt drives may be used where power transmission is low, or on low speed large diameter wheels, or in applications where belt slippage on overload may be necessary. Flat belts can also have advantages of lower wear rate, easier alignment, and easier interchangeability.
2. A v-belt by its shape, puts more surface area in a smaller space width wise. It also is less likely to track (or wander) off the pulley when running. It's wedging action may put more force on the friction surfaces and permit more force to be handled. The amount and type of load make a difference in what kind of drive is used. Very high RPM favor gears and chain drives. Very high initial loads from starting favor gear and chain drives. Very high temperatures favor gear and chain drives. The need for very precise control favors gear drives. Belt drive are best in relatively clean environments or where it is difficult to provide lubrication. A chain drive on a table saw with all the saw dust would not be a good choice. In general for endurance, a gear is best followed by a chain and then a belt drive. Belts on a pulley system tend to stretch and that is a consideration.
3. V-belts have less tendency to slip away from the pulley than flat belts Parameters needed: length of belt, pulley diameter, speed of motor