Drive mechanism for a four wheel drive transverse engine-mounted vehicle

摘要

A differential unit ( 102 ) is provided with a ring gear ( 10 ) that meshes with an output gear ( 21 ) of a transmission ( 101 ), an axle shaft ( 105 ) that is connected to front wheels, and a drive gear ( 11 ) that is fixed by screws to a plurality of boss portions ( 3 e) and spaced apart from the ring gear ( 10 ). A transfer unit ( 103 ) disposed rearward of the differential unit ( 102 ) is provided with a driven gear ( 20 ) that meshes with the drive gear ( 11 ). Drive force is transmitted from the driven gear ( 20 ) to a propeller shaft ( 104 ), and the propeller shaft ( 104 ) transmits the drive force to rear wheels. First material-removed portions ( 12 ) made of concave portions are formed in an inner circumference of a portion of a case ( 1 ) to which the axle shaft ( 105 ) is mounted. Second material-removed portions ( 13 ) made of concave portions that extend in an axial direction of the axle shaft ( 105 ) are formed between the plurality of boss portions ( 3 e).