Transmission housing and wheeled vehicle provided with such a transmission housing

A transmission housing comprising:

• a body formed by at least two shells that when assembled about a parting line form an enclosure that can be at least partially filled with lubricant,
• this housing comprising, seated at least partially inside the housing, at least one rotary input shaft with a longitudinal axis and an output shaft to which the rotational movement of the or of the at least one of the input shafts can be transmitted,
• this rotary input shaft comprising a drive end that is accessible from outside the housing to enable said input shaft to be driven in rotation and a threaded portion to form a worm screw,
• said input shaft having a bearing comprising a coaxial inner ring surrounding said input shaft and a coaxial outer ring, and bearing members arranged between said rings,
• said bearing being arranged on the input shaft between the threaded portion and the drive end of said input shaft, said housing including a space for receiving this bearing and a space for receiving the threaded portion inside the enclosure,
• wherein the housing comprises a barrier arranged between said spaces, this barrier extending continuously or discontinuously about said input shaft forming an access passage for the input shaft from one space to the other space, this barrier comprising at least two parts, one of said parts being carried by one of the shells and the other of said parts being carried by the other of the shells, each barrier part being integral with the related shell, at least one of the barrier parts being shaped to form one or more deflectors, the or at least one of the deflectors being at least partially formed by a surface sloping downwards from the body of the housing towards the input shaft, when the input shaft is positioned vertically and the bearing is arranged above the threaded portion of the input shaft.