| 摘要 |
The invention relates to a multi-speed transmission (10) comprising an input shaft (11), a first driveshaft (13) and a second driveshaft (14), each of the two concentric driveshafts (13, 14) having at least two driving gearwheels (G1a, G2a, G3a, G4a, G5a), a second driveshaft (14), having a at least three driving gearwheels (GRa, GLa, G1a, G2a, G3a, G34a, G45a, G56a, G67a), a driven shaft (15) with a plurality of gearwheels (Gb, GLb, G1b, G2b, G3b, G4b, G34b, G45b, G56b, G67b) on it meshing with the driving gearwheels (GRa, GLa, G1a, G2a, G3a, G4a, G34a, G45a, G56a, G67a) on said driveshafts (13, 14), said gearwheels (GRa, GLa, G1a, G2a, G3a, G4a, G34a, G45a, G56a, G67a; Gb, GLb, G1b, G2b, G3b, G4b, G34b, G45b, G56b, G67b) for forward speeds being engageable to said shafts (13, 14; 15, 16) with clutches (C1, C2, C3) forming a power flow from said driveshafts (13, 14) to the driven shaft (15) with different ratios, a controllable lock-up clutch (CL) being arranged between the driveshafts, connecting said driveshafts (13, 14) with each other, an electric machine (17) with a rotor (17a), a planetary gearset (20) with three links (21, 22, 23), a first (21) of said links being connected to the first driveshaft (13) and the input shaft (11), a second link (22) being connected to the second driveshaft (14), and a third link (23) being kinematically connected to the rotor (17a) of said electric machine (17). The speed ratio between the second link (22) and the third link (23) for stopped first link (21) has defined value: i PGS <0. The gear ratio of the first gearing (GL, G1) on the second driveshaft (14) has defined value: i G1 . Tthe gear ratio of the first gearing (G1, G2) on the first driveshaft (13) matches the inequality i G2 < i G1 / (1-(1/i PGS )) The gear ratio of the second gearing (G2, G3, G34) on the second driveshaft (14) matches the inequality i G3 < i G2 . T The gear ratio of the second gearing (G3, G4, G5) on the first driveshaft (13) matches the inequality i G4 < I G3 / (1-(1/i PGS )) and the gear ratio of the third gearing (G45, G56, G67) on the second driveshaft (14) matches the inequality i G5 < i G4 . |
