Delphi France Automotive Systems

Gm Global Technolgoy Operations, Inc.

Roland Mathis

Marc Andres

Pierre Adolf

A powertrain has a planetary transmission having a planetary gear arrangement and six torque transmitting mechanisms that are controlled to provide six forward ratios and a reverse ratio. The planetary gear arrangement includes two sun gear members, two ring gear members, and a planet carrier assembly member that are disposed in three axially spaced planes of gear mesh. The planet carrier member has a short pinion gear member, meshing (first plane) with one sun gear member, a first long pinion gear member having a small gear section, meshing (first plane) with the small pinion gear member and one ring gear member, and a large gear section, meshing(second plane) with the other sun gear member, and a second long pinion gear member, meshing (second and third planes) with both the large gear section (second plane) and the second ring gear member (third plane). The second long pinion gear member permits the pitch diameter of the second ring gear member to be radially inward of the pitch diameter of the first ring gear member.

Six speed planetary transmission with two overdrive ratios

An automatic transmission comprising a housing (12); a planetary gear train (14) mounted within the housing; an input drive shaft (16) for providing input drive to the planetary gear train; an output drive shaft (18) connected with an output drive from the planetary gear train; a first clutch (C1) connected between the input drive shaft and a first drive input (22) to the planetary gear train; a second clutch (C2) connected between a first reaction input (28) to the planetary gear train and the housing; a third clutch (C3) connected between a second reaction input (30) to the planetary gear train and the housing; a fourth clutch (C4) connected between a third reaction input (32) to the planetary gear train and the housing; and a fifth clutch (C5) connected between a second drive input (24) to the planetary gear train and the input drive shaft; wherein for first forward gear ratio the first and second clutches are engaged; for second forward gear ratio the first, second and third clutches are engaged; for third forward gear ratio the first, second, third and fourth clutches are engaged; and for fourth forward gear ratio the first, second, third, fourth and fifth clutches are engaged. Allows gear shift by the operation of a single clutch.

Automatic transmission requiring operation of single friction device for

An automatic transmission (10) comprising a housing (12); a planetary gear train (14) mounted within the housing; an input drive shaft (16) connectable to main drive means (38) to provide input drive to the planetary gear train; an output drive shaft (18) from the planetary gear train; and an auxiliary drive means (E) for providing a variable auxiliary drive input (34) to the planetary gear train; wherein the planetary gear train includes a first planetary gear set (40) and a second planetary gear set (42); the first planetary gear set including a sun gear (44) having a drive input (26) connectable to the input drive shaft and a reaction input (28) connectable to the housing, a pinion gear (46) interengaging with the sun gear, and a pinion carrier (48) on which the pinion gear is rotatably mounted, the pinion carrier having a drive input (24) connectable to the input drive shaft and a reaction input (30,32) connectable to the housing, and being connected with the auxiliary drive input; the second planetary gear set including a sun gear (50) having a drive input (22) connectable with the input drive shaft; and wherein the output drive shaft is driven by a ring gear (54) of the first planetary gear set or the second planetary gear set. Provides an automatic transmission with first and second constant forward gear ratios with a continuously variable gear ratio therebetween.

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Ribeauville, France

Roland Mathis