Improvements in four-wheel drive transmission systems for motor vehicles.

摘要

A four-wheel drive transmission system for motor vehicles having a front engine and gear-box disposed transversely with respect to the longitudinal direction of the motor vehicle, including a front differential (3) and an intermediate differential (18) both contained in a casing rigidly secured to the gear-box casing, with the intermediate differential (18) disposed within a portion (9a) of the said gear-box casing and the front differential (3) contained in a separate casing (9b) fixed to the gear-box casing (9a). The planet carriers (10,19) of the front differential (3) and the intermediate differential (18) have respective tubular hubs (10b,19c) coaxial with one of the half-shafts (6b) of the front wheels of the vehicle connectible together for rotation by means of a slip-limiting device (26) of the intermediate differential. This slip-limiting device (26) is housed in a casing (27) fixed to the said separate casing (9b) and having a quick-release axial cover (28) disposed at the outer end of the said half-shaft (6b).