Poly v belts are produced in a monobloc design and made up of multiple v shaped ribs. These ribs run along the inside length of the belt, as appose to across the belt like the teeth on a timing belt. The v shaped ribs are designed to run on a pulley with corresponding grooves, which the ribs fit neatly into. The belt transmits torque by contact of the belt rib flanks and the pulley grooves. The belts one piece structure guarantees an even distribution of tension across the width of the pulley where the belt is in contact.
The poly v belt comprises of a number of ribs made from a compound of high abrasion resistance elastomer, geometrically optimised for maximum contact with the pulley. A polyester or aramid cord runs through the belt for strength whilst the reinforced rubber backing protects the cord and the radial stability of the belt. The rubber backing can also be used to transfer power onto a smooth pulley. This combination of design features and materials allows the poly v belt to counter-bend, enabling a single belt to drive several accessories from both sides of the belt.
A significant benefit of the poly v belt is its compactness. Designed to have a larger contact surface area than that of the traditional V-belt or Flat Belt, the poly v belt can operate at a minimum pulley diameter of just 9mm, compared to a minimum pulley diameter of 50mm with a traditional V-belt. Improved transmission ratio is also possible (Poly V 1:60 vs V-belt 1:20) removing the need for stepped pulleys. In addition to these space saving features, reduced belt width is also possible for a given geometry and the same power transfer. The poly v belt also offers reduced noise and vibration levels. Thanks to the monobloc design, there is no need to match belts like with v-belts, reducing maintenance and eliminating belt differential ‘flapping’. Add to the above the increased lifespan on a poly v belt – which can last up to four times longer than a V-belt – and it is no surprise that the poly v belt is fast becoming the chosen belt for designers, manufacturers and industrial applications.
This article comes from acorn-ind edit released