Temperature driven winding system

A drive system for energizing a timepiece, comprising:

• a substantially U-shaped closed reservoir, a fluid within the reservoir expanding or contracting as a function of a temperature differential, and a bellows disposed within the U-shape of the U-shaped closed reservoir, and the bellows in fluid connection with the reservoir providing axially motion in response to the expansion or contraction of the fluid.

A self-winding timepiece comprising:

• a casing, a movement, a main spring for driving the movement and a winding mechanism for the main spring in the casing, and an energy source for driving the winding mechanism which comprises a substantially C-shaped, closed reservoir, a fluid within the reservoir expanding or contracting as a function of a temperature differential, and a bellows disposed within the C-shape of the C-shaped reservoir, the bellows being in fluid connection with the reservoir and providing axially motion in response to the expansion or contraction of the fluid.

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