Patent ID: 7823474

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