Montblanc installed a large, massy, screw balance in the Heritage Chronométrie ExoTourbillon Minute Chronograph. In a traditional tourbillon construction, this large balance would require a correspondingly large and heavy rotating cage. But the innovative mechanism of the ExoTourbillon solves this problem by isolating the screw balance from the rotating cage https://www.captainthewatch.is.
The cage is smaller than the balance, which oscillates outside the rotating carriage and on a higher plane. The screw balance is borne between two jewels, while the tourbillon is neither cantilevered nor sandwiched between two bridges, but turns in a two-point bearing at the foot of its staff. The advantage of this construction is that a smaller rotating cage has less mass so it needs less energy to support its rotary motion.
The rotating cage per se is also liberated from the weight of the screw balance: this further reduces the amount of necessary energy because the screw balance, which is isolated from the rotating carriage, is not disturbed by the inertia of the carriage. Compared to a traditional tourbillon construction, energy savings of approximatively 30% are achieved, while at the same time increasing the precision. This innovative construction derives its name from the Greek prefix “exo”, which means “outside” or “external”.
The cage is smaller than the balance, which oscillates outside the rotating carriage and on a higher plane. The screw balance is borne between two jewels, while the tourbillon is neither cantilevered nor sandwiched between two bridges, but turns in a two-point bearing at the foot of its staff. The advantage of this construction is that a smaller rotating cage has less mass so it needs less energy to support its rotary motion.
The rotating cage per se is also liberated from the weight of the screw balance: this further reduces the amount of necessary energy because the screw balance, which is isolated from the rotating carriage, is not disturbed by the inertia of the carriage. Compared to a traditional tourbillon construction, energy savings of approximatively 30% are achieved, while at the same time increasing the precision. This innovative construction derives its name from the Greek prefix “exo”, which means “outside” or “external”.
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