Poly Belts / Ribbed Belts

What is a poly belt?

The Poly Belt, or Ribbed Belt, has longitudinal v-shaped ribs running along the inside of the belt. These ribs provide a larger contact area, increasing friction force between the pulley and the belt. This enables the belt to transmit more power when compared to an identically sized flat belt or rubber belt.

The compact nature of the belt makes it ideal for high speed drives which are limited in terms of space. These belts also have a high level of efficiency, reducing the amount of energy that is lost within the drive.

Invented by Hutchinson Belt Drive Systems, the Poly belt comprises 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 belt to counter-bend, enabling a single belt to drive several accessories from both sides of the belt.

Benefits of a poly belt

A significant benefit of the Poly belt is its compactness. With a larger contact surface area than that of the traditional V-belt or Flat Belt, the Poly 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 belt also offers reduced noise and vibration levels. Thanks to the monobloc design, there is no need to match belts like with belts, reducing maintenance and eliminating belt differential ‘flapping’.

Add to the above the increased lifespan of a Poly belt - up to four times longer than a V-belt, and it is no surprise that the Poly belt is fast becoming the chosen belt for designers, manufacturers and industrial applications.

What options are available for poly-belts?

A number of different options are also possible:

1. Aramid cord

2. Resistant compounds to oil, ozone, or high temperature

3. Special hardness (61, 67, 73 shore A)

4. Extra thickness overbackings

5. Profiles available: PH, PJ, PK, PL and PM

6. Double-sided Poly belts can also be manufactured upon request.

Applications for a poly belt

Applications where the Poly belt excels include: Mines & Quarries, Pumps, Paper Industry, Energy, Aerospace, Timber industry, Escalators, Industrial engines, Refrigeration ventilation, Gardening equipment, and fitness equipment.

Contact your nearest Acorn branch for further details.

Poly-V® is a registered trademark.

Why choose Acorn for Poly belts?

Acorn Industrial Services is one of the UK’s leading suppliers of industrial components, with a team of experts, ready to provide advice on Poly belts alongside our broader selection. 

Need support?  Our specialists are available for all your needs. Check out our reviews for more information.

Poly Belts / Ribbed Belts FAQs