Timepiece barrel with improved transmission of force

A timepiece barrel comprising:

• at least one mainspring cooperating at an inner end thereof with a core pivoting about a pivot axis, and at an outer end thereof with an inner track of a barrel drum by way of a resilient sliding bridle,
• wherein said inner track and said resilient sliding bridle are each of non-circular shape, and said resilient sliding bridle is nested inside said inner track in a free state of said resilient sliding bridle, and said inner track and said resilient sliding bridle are arranged such that at least one outwardly radially projecting raised portion comprised in said resilient sliding bridle is abuttingly engaged with at least one inwardly radially projecting sill comprised in said inner track when torque applied to said resilient sliding bridle is less than a torque limit value,
• wherein said resilient sliding bridle includes a plurality of said raised portions and forms a closed contour an outer periphery of which is dimensionally similar to said inner track, and
• wherein said at least one raised portion of said resilient sliding bridle is subjected to a radial constriction when the torque applied to said resilient sliding bridle is greater than said torque limit value, to allow said raised portion to pass over said sill and to allow said bridle to travel angularly under an effect of said torque until a next encounter between said sill and another of said raised portions.