Patent ID: 7819038

Claim:
A gear comprising: a pinion including a cylindrical ring with an external surface and an inner surface; a shaft which is rotatably mounted in a support; and a disc which is mounted between the pinion and the shaft such that the pinion and the shaft are integral, the disc including an external ring, an internal ring and a plurality of cleavable radial arms disposed between the external ring and the internal ring, wherein an outer surface of the external ring of the disc abuts the inner surface of the cylindrical ring of the pinion and an inner surface of the inner ring of the disc is integral with the shaft, wherein the cleavable radial arms are arranged to disengage the pinion from the shaft in case of an overcouple between the pinion and the shaft, and wherein a guiding module of the pinion is arranged to rotatably maintain the pinion inside the support in case of a disengagement of the pinion from the shaft.