FOUR-WHEEL-DRIVE VEHICLE TRANSMISSION

摘要

A four−wheel−drive vehicle transmission (1) having a drive torque input shaft (8) rotated by the vehicle engine (2) about a first axis of rotation (A); a front output shaft (10) connected to the front axle (3) of the vehicle; a rear output shaft (12) connected to the rear axle (4) of the vehicle; an auxiliary tubular shaft (14) mounted alongside the input shaft (8) to rotate about a second axis of rotation (D) parallel to the first axis of rotation (A); a number of groups of gears (15, 16) for selectively connecting the auxiliary tubular shaft (14) mechanically to the input shaft (8); a first countershaft (17) mounted for rotation about the second axis of rotation (D) inside the auxiliary tubular shaft (14); a second countershaft (18) mounted for rotation about the second axis of rotation (D) opposite the first countershaft (17); a planetary gear train (19) for mechanically connecting the auxiliary tubular shaft (14) to the first (17) and second (18) countershaft; and a first (25) and a second (26) cascade gear set for mechanically connecting the second countershaft (18) to the rear output shaft (12), and the first countershaft (17) to the front output shaft respectively (10).