Timing belts are designed both for applications in diesel and petrol engines, and are fitted both on motorcars and industrial vehicles.
With the use of new materials, the belts can be made in various structures and tooth profiles, to guarantee the performance of modern vehicles.
Nowadays, belts are subject to stresses and working conditions that seemed impossible only a few years ago:
- High fuel injection pressure, which can reach up to 2000 bar in some applications
- Multi-valve engines: double camshaft with higher stresses
- Engines with high power and operating temperatures over 120°C/250°F
They should also guarantee:
- Noise reduction
- Limited dimensional tolerances
- Limited variation of the belt dimensions in operation
- High resistance to cloth abrasion
- Longer service life/mileage
- NR: first generation belts, generally not subjected to high workloads nor to high thermal stress (working temperature 80°C-90°C/175°F-195°C).
- HSN: offer superior resistance to high working temperatures (even up to 110°C/230°F) and to pulsating loads.
- HDT: are foreseen for some particularly heavy applications. To increase resistance to lateral wear, they are equipped with a special fabric on the back, withstanding temperatures up to 115°C/240°F.
- HT: with tooth tissue coated with a PTFE film (highly abrasion-resistant material), designed to minimize wear on tooth tissue. They are mainly used on diesel engines of the latest generation and with high injection pressures: they guarantee maximum life span of the belt on the engines, withstanding temperatures up to 120°C/250°F.
- HK: latest generation product, equipped with aramid-based fibers for superior durability and noiselessness. They resist temperatures up to 120°C/250°F.
- BIO: distribution belts designed to work in an oil bath. They resist the action of additives and the high temperatures of the engine oil.