Planetary dual power path transmission with electric motors
View Patent ↗A dual path planetary transmission includes two planetary gearsets each having a sun gear member, a ring gear member, and a planet carrier assembly member. Each of the members of the planetary gearsets are selectively connectible between an input shaft, an output drive mechanism, and a stationary member. Each of the planetary gearsets is effective to provide a reverse ratio and five forward gear ratios. The output mechanism of each of the planetary gearsets includes a different gear ratio between the output mechanism and the transmission output shaft.
1. A planetary transmission comprising:
an engine driven input shaft;
an output mechanism including first and second selectively engageable clutches;
a stationary member;
a first planetary gearset having a first gear member, a second gear member, and a third gear member;
first means for selectively interconnecting each of said first, second, and third members of said first planetary gearset with each of said input shaft, said output mechanism, and said stationary member;
a second planetary gearset having a first gear member, a second gear member, and a third gear member;
second means for selectively connecting each of said first, second, and third members of said second planetary gearset with each of said input shaft, said output mechanism, and said stationary member;
said first means and said first clutch being selectively operable to establish five forward speed ratios between said input shaft and said output mechanism;
said second means and said second clutch being selectively operable to establish five forward speed ratios between said input shaft and said output mechanism; and
said second means being operable to preselect a forward ratio in the operation of an adjacent forward ratio in said first planetary gearset, and said first means being selectively operable to preselect a forward ratio during the operation of an adjacent forward ratio in said second planetary gearset.
2. The planetary transmission defined in claim 1 further comprising:
a first motor/generator drivingly connected with said first clutch; and
a second motor/generator drivingly connected with said second clutch.
3. The planetary transmission defined in claim 2 further wherein said second planetary gearset is also selectively operable to provide a reverse drive ratio.
4. The planetary transmission defined in claim 2 further wherein said output mechanism has an output shaft, a first gear ratio between said first clutch and said output shaft, and a second gear ratio between said second clutch and said output shaft.
5. The planetary transmission defined in claim 2 further wherein said first planetary gearset is also selectively operable to provide a reverse drive ratio.
6. The planetary transmission defined in claim 4 further wherein each of said electric motor/generators is used to facilitate said selective connection of said planetary gearset connected thereto with each of said input shaft, said output mechanism, and said stationary member.
7. A planetary transmission comprising:
an engine driven input mechanism including first and second selectively engageable clutches;
an output shaft;
a stationary member;
a first planetary gearset having a first member, a second member, and a third member;
first means for selectively interconnecting each of said first, second, and third members of said first planetary gearset with each of said input mechanism, said output shaft, and said stationary member;
a second planetary gearset having a first member, a second member, and a third member;
second means for selectively connecting each of said first, second, and third members of said second planetary gearset with each of said input mechanism, said output shaft, and said stationary member;
said first means and said first clutch being selectively operable to establish five forward speed ratios between said input mechanism and said output shaft;
said second means and said second clutch being selectively operable to establish five forward speed ratios between said input mechanism and said output shaft; and
said second means being operable to preselect a forward ratio in the operation of an adjacent forward ratio in said first planetary gearset, and said first means being selectively operable to preselect a forward ratio during the operation of an adjacent forward ratio in said second planetary gearset.
8. The planetary transmission defined in claim 7 further comprising:
a first motor/generator drivingly connected with said first clutch; and
a second motor/generator drivingly connected with said second clutch.
9. The planetary transmission defined in claim 8 further wherein said input mechanism has an input shaft, a first gear ratio between said input shaft and said first clutch, and a second gear ratio between said input shaft and said second clutch.