Patent ID: 6669596
Filing Date: 2003-12-30
Classification: F16H

Abstract:
A powertrain including a power transmission comprising:an engine; a power input shaft continuously connected with said engine; a power output shaft; a first selectively engageable input clutch operatively connected with said input shaft; a second selectively engageable input clutch operatively connected with said input shaft; a first planetary gear means including a first member continuously connected with said power output shaft, a second member, and a third member; a second planetary gear means including a first gear member continuously connected with said power output shaft, a second member, a third member, and a fourth member; a first mechanical clutch selectively connectible between said first input clutch and said second member of said first planetary gear means; a second mechanical clutch operable to individually selectively connect said second input clutch with said third member of said first planetary gear means and with said second member of said first planetary gear means; a third mechanical clutch operable to connect said first input clutch and said first mechanical clutch selectively, individually with a fifth mechanical clutch and said second member of said second planetary gear means; a fourth mechanical clutch selectively connecting a first brake mechanism individually with said third member of said second planetary gear means and with a member of a group consisting of said second member of said second planetary gear means and said fourth member of said second planetary gear means; said fifth mechanical clutch selectively individually connecting said third member of said first planetary gear means with said fourth member of said second planetary gear means and said second member of said first planetary gear means with said fourth member of said second planetary gear means; a second brake mechanism selectively connectible with said fourth member of said second planetary gear means when said fourth mechanical clutch is connectible with said second member of said second planetary gear means and selectively connectible with said second member of said second planetary gear means when said fourth mechanical clutch is connectible with said fourth member of said second planetary gear means; and said input clutches, said mechanical clutches, and said brake mechanisms being selectively engaged in a plurality of combinations to establish at least six forward speed ratios and one reverse speed ratio between said input shaft and said output shaft.