Differential reducer including means for collecting oil in the two directions of rotation

A motor vehicle differential reducer comprising:

• a substantially longitudinal differential mechanism comprising at least one ring gear of which a lower portion is intended to be immersed in lubricating oil;
• a reduction mechanism comprising a secondary shaft and a primary shaft, a pinion of the primary shaft being driven by the ring gear via a pinion of the secondary shaft;
• a case which contains the differential mechanism and the reduction mechanism, the differential mechanism and the primary and secondary shafts each being borne in the case by an associated pair of opposite bearings, the case comprising, on the one hand, a first half-case of which an internal transverse wall comprises three housings which each receive a first bearing of each pair, and, on the other hand, a second half-case of which an internal transverse wall comprises three housings which each receive a second bearing of each pair,
• the rotation of the ring gear in a first direction of rotation being capable of spraying oil substantially transversely from the top of the ring gear in the direction of the primary and secondary shafts, each internal transverse wall having first means for collecting and guiding the oil sprayed by the ring gear rotating in the first direction of rotation to the housings;
• wherein each internal wall comprises second means for collecting the oil sprayed substantially transversely by rotation of the ring gear in a second direction of rotation from the bottom of the ring gear in the direction of the primary and secondary shafts.