The most common way of translating azionamento is "drive". It is in the proz glossary and it is also in Marolli and Eurodic uses it in dozens of combinations.
As you don't appear to have any more detail (are they motors, shafts, belts or something else again?) I would have used the formula I offer.
See:

Mechanical Components, Timing Pulleys, Gears
... Quote Request. ... ISO 9001 producers of over 68,000 drive
components shippable overnight worldwide. ...
Description: Need some drive belts, or gears for your rotary gap ? These guys stock what ever you need.
Category: Science > Technology > ... > Commercial Sources > Spark Gaps and Parts
www.sdp-si.com/

"Vibration & Shock Mounts- Drive Components 790-8-1
Home Page 8– 1 8 – Vibration & Shock Mounts PICTORIAL
GUIDE TO VIBRATION AND SHOCK ...
Description: Vibration & Shock Mounts Locator Chart
Category: Business > Environmental and Safety > Noise and Vibration > Products > Control
www.sdp-si.com/herb/spk/sdp-si/D790/HTML2/D790C08001.html

Drive Components!
... 3 or 4 Wheelin | Dress It Up! | Handlebars and Grips | Drive Components Electrical Components | Intake and Exhaust | Security | Tools and Lubricants | Off-Road ...
shop.store.yahoo.com/azmotorsports/drive.html


Tsubaki Automotive Timing Chain & Drive Components
Search Tsubaki's web. ... Tsubaki automotive timing chain & drive
components. Products. timing chain products. ...
www.tsubakimoto.co.jp/english/products/auto

Automotive Front Wheel Drive Axels Drive Train Service of ...
drivetrain doctors, we help you solve the problem!
Front Wheel Drive Components, , New ...
www.drivetrain.com/frtwhl.html

Angela