Protective bellows and transmission joint provided with such a bellows

A protective boot, in particular for at least partial protection of the male element and female element of a transmission joint, said boot being in the form of a tubular body that is open at each of its ends, said body having two zones of different sections, with one of the zones, of smaller section, called the small base of the body and the other zone, of larger section, called the large base of the body, said protective boot comprising:

• a deformable external radial wall of said body separating said zones from one another, this deformable external radial wall extending transverse to the longitudinal axis of said body,
• wherein the deformable external radial wall, the small base and the large base of the body are made in one piece, in that the deformable external radial wall of said body, which has a face turned toward the small base of the body, is provided at its zone for connection to the large base of the body with an external peripheral groove with an external radial opening,
• in that this groove comprises at least two flanks and a bottom,
• in that the flanks of the groove extend one on one side and the other on the other side of a plane that is perpendicular to the longitudinal axis of the body and passes through the bottom of the groove,
• in that one of the flanks and the bottom of the groove protrude from the face of the deformable external radial wall that is turned toward the small base of the body so as to form a reinforcing rib, and
• in that the deformable external radial wall is a pleated wall comprising one or more pleats, the one or more pleats extending on the same side of the plane that is perpendicular to the longitudinal axis of the body and passes through the bottom of the groove, this side of the plane corresponding to the side of the plane that is turned toward the large base of the body.