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US 2006/0068964 A1Published application
Countershaft planetary transmissions
AssigneeGeneral Motors Corporation
InventorsDonald Klemen, Arthur Hall
Life of this patent
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Abstract
A multi-speed power transmission includes a countershaft portion and a planetary gearset portion. The countershaft portion is controlled by synchronizer torque-transmitting mechanisms, and the planetary gearset portion is controlled by selectively engageable friction-type torque-transmitting mechanisms. The selective operation of these torque-transmitting mechanisms permit eight forward speed ratios and three reverse speed ratios.
Claims5
A power transmission comprising:
- a countershaft portion;
- a planetary gearset portion;
- an input shaft;
- an output shaft;
- said countershaft portion including a plurality of ratio gearsets connectible with said input shaft by a plurality of selectively engageable mechanical torque-transmitting mechanisms, and an output gearset connectible with a first member of said planetary gearset;
- a second member of said planetary gearset being selectively connectible with said input shaft through a selectively engageable input torque-transmitting mechanism;
- said planetary gearset including a third member continuously connected with said output shaft;
- a first torque-transmitting mechanism selectively interconnecting said first and third members of said planetary gearset;
- a second selectively engageable torque-transmitting mechanism interconnecting said first member of said planetary gearset with a transmission housing;
- and
- a third selectively engageable torque-transmitting mechanism selectively interconnecting said second member of said planetary gearset with said transmission housing.
8 more elements
Dependencies are inferred from the claim text.