Disclosed is a drivetrain comprising a frame defining a central plane respectively opposite half-spaces, and two driving lines housed in such half-spaces; the driving lines comprise respective torque input elements and torque output elements, and they further comprise at least a cross-plane intermediate element adapted to transmit torque coming from the first or from the second torque input towards the first or to the second torque output and across said central plane.

A case for housing a driving force transmission device includes a wall section defining a through-hole through which a shaft is configured to pass. The wall section, as viewed from an axial direction, includes an annular section surrounding the through-hole, first ribs that extend radially outward from the annular section, a second rib that crosses a vertical line that passes through an axial center of the shaft from one side to the other side, and a recess that opens at a bottom end surface of the wall section, and recessed in a direction along the vertical line. A bottom surface of the recess has a shape such that a side farther from the vertical line is located closer to a bottom end surface side. A region of the wall section in which the recess is provided is connected to one end of the second rib.

A gearbox includes a pair of housings which are respectively provided with a bearing block protruding axially from an inner surface thereof. A radial inner surface of the bearing block defines a bearing chamber for accommodating a bearing. At least one of the housings being provided with a lubricating assembly on the inner surface thereof. The lubricating assembly includes (i) an oil deflector having a radial segment extending from a radial outer surface of the bearing block in a direction away from the radial outer surface, and a circumferential segment extending from the radial segment along the radial outer surface, and (ii) a middle oil guide rib intersecting with the radial outer surface of the bearing block and being provided with, at the intersection, an oil inlet hole providing access to the bearing chamber of the bearing block. The oil inlet hole is located on a lower side of the oil deflector. The circumferential segment extends towards the oil inlet hole. And a portion of the middle oil guide rib adjacent to the oil inlet hole is located on an upper side of the oil inlet hole.