| 摘要 |
A motor vehicle powertrain (10, 210, 310) having a rear driveline module (RDM) (20) for driving a pair of rear wheels (14a, 14b) and a method of assembly can include a hydraulically actuatable rear axle coupling clutch (28) operable to transmit rotary power between an input pinion shaft (22, 222) and a rear differential case (30, 230) and a hydraulic actuating assembly (16). The powertrain (10, 210, 310) can include a hydraulically actuatable differential control clutch (34) mounted coaxial to the rear axle coupling clutch (28) and a power take-off unit (PTU) (36) having a hydraulically actuatable PTU coupling clutch (42). The differential control clutch (28) can provide for speed differentiation between the rear differential case (30, 230) and a half axle shaft (26a, 26b) drivingly connected to a pair of rear wheels (14a, 14b). The PTU coupling clutch (42) can transmit rotary power between an input shaft operable to receive rotary power from a front differential case and an output pinion shaft (40) interconnected with the input pinion shaft (22, 222) through a driveshaft (18) in an all-wheel drive mode. |
| 主权项 |
1. In a motor vehicle powertrain (10) including a secondary drive split axle for driving a pair of wheels (14a, 14b), the improvement of the motor vehicle powertrain (10) comprising:
a rear driveline module (RDM) (20, 320) including:
a planetary gear assembly having a ring gear (112) defining a differential axis;a common planetary gear carrier supporting a first set and a second set of planetary gears (118a, 118b) for rotation about the differential axis, the first and second sets of planetary gears (118a, 188b) rotatable independently of one another;first and second sun gears (126a, 126b) connected to the pair of wheels (14a, 14b), respectively, the first sun gear (126a) meshing with the first set of planetary gears (118a) for driving one of the pair of wheels (14a) and the second sun gear (126b) meshing with the second set of planetary gears (118b) for driving another of the pair of wheels (14b);a lubrication delivery system (50) for lubricating the ring gear (112), the first and second sets of planetary gears (118a, 118b), and the first and second sun gears (126a, 126b);a hydraulically actuated coupling clutch (28) mounted on the differential axis interposed between the pair of wheels (14a, 14b);a single fluid pump (66) providing a source of pressurized fluid; anda hydraulic control system (16) for selectively providing fluid communication from the single fluid pump (66) with the coupling clutch (28) for actuating the coupling clutch (28) and with the lubrication system (50) for lubricating the ring gear (112) and the first and second sets of planetary gears (118a, 118b) and the first and second sun gears (126a, 126b) on-demand with a dry sump eliminating shearing of fluid by the ring gear (112) for increased efficiency. |
