The Monaco V4 integrates the first drivebelt transmission in a watch movement.
In 2009, TAG Heuer again turns watchmaking fundamentals inside out with the invention of the drivebelt transmission. The revolution rests on two innovations. The first replaces the pinions of traditional mechancial movement with a relay of five notched belts. The second innovation reinvents the classic circular winding system with a radical new design. Instead of rotating, the linear weight moves up and down along a circuit of V cylinders, echoing the design of high-performance racecar engines.
A revolutionary belt-driven transmission
The patented belt-driven transmission is a high-yield relay of 5 notched micro drive-belts whose tension is controlled by 2 turnbuckles. The transmission belts in polyether block amide have a 0.07mm section, and are 10 times smaller than any belt ever manufactured.
Reinventing energy and automatic winding systems
A second patent was granted for the innovative linear mass, replacing the classic oscillating mass. Mounted on the word’s smallest ball bearings, the 12g tungsten ingot moves up and down between 2 pairs of V-shaped barrels (hence the name V4). The barrels are angled at +/- 13 degrees, like the cylinders of a high performance racing engine.
With its square shape and automatic chronograph, the Monaco V4 recalls the original Monaco series. But with its complex design clearly visible through sapphire glass in the front and back, the Monaco V4 shows how truly evolved watchmaking can become.