Belts for reverse bends

Polydrive from Fenner Power Transmission is a new family of shallow aspect ribbed belts. Offering greater efficiency than conventional V-belts, these are able to provide reduction ratios up to 5.62:1 with compact, relatively low cost pulleys.

Because of its high width to thickness ratio, Polydrive not only works with small, low mass pulleys, it also dissipates very little energy in hysteresis when flexing the belt. This also permits reverse bends for serpentine drives, and allows power to take off from the back of the belt.

According to the company, compared with a conventional V-belt for the same power, Polydrive has only 70% of the belt mass. Benefits include reduced inertion of the drive, reduced tension needed for a given power, and so improved bearing life.

Fenner Power Transmission. Tel: 01254 674171