Planetary gear type multistage transmission for vehicle

Abstract

The transmission 10 is constructed so that, in the first transmission portion 36 , the rotation of the input shaft 16 is outputted to the second transmission portion 38 via the first intermediate output path M 1 and the second intermediate output path M 2 accelerated and rotated with respect to the first intermediate output path M 1 , and, in the second transmission portion 38 , the first rotary element RE 1 (S 2 and S 3 ) is selectively connected to the first driven gear CG 1 B via the first clutch C 1 and is selectively connected to the second driven gear CG 2 B via the third clutch C 3 , the second rotary element RE 2 (CA 1 and CA 2 ) are selectively connected to the first driven gear CG 1 B via the second clutch C 2 and are selectively connected to the transmission case 12 operating as a non-rotating member via the first brake B 1 , the third rotary element RE 3 (R 1 , R 2 and CA 3 ) is connected to the output gear 28 operating as an output rotating member, the fourth rotary element RE 4 (S 1 ) is selectively connected to the transmission case 12 via the second brake B 2 , and the fifth rotary element RE 5 (R 3 ) is selectively connected to the second driven gear CG 2 B via the fourth clutch C 4 . A forward multistage transmission can be obtained by engagement operations of the friction engagement devices.

1 . A planetary gear type multistage transmission for vehicles, which is composed so that the transmission is provided with a first transmission portion and a second transmission portion, transmits rotations of an input rotating member, which is positioned at the driving-force source side and is rotatable around a first axial center, to the second transmission portion on a second axial center parallel to the first axial center via the first transmission portion, and outputs the same from an output rotating member rotating around the second axial center;
 wherein the first transmission portion transmits rotations of the input rotating member to the second transmission portion via a first intermediate output path and a second intermediate output path;   the second transmission portion is provided with three planetary gear sets of a first planetary gear set, a second planetary gear set and a third planetary gear set, which are disposed one after another to be concentric with the second axial center, wherein five rotary elements are composed of sun gears, carriers and ring gears of the three planetary gear sets partially connected to each other, at least four rotary elements of the five rotary elements are selectively connected to any one of a first driven member composing the first intermediate output path at the second axial center side, a second driven member composing the second intermediate output path at the second axial center side and a non-rotating member via clutches or brakes;   wherein seven forward speed transmission stages are established by selectively engaging clutches and brakes with each other and disengaging the clutches and brakes from each other.   
   
   
       2 . A planetary gear type multistage transmission for vehicles according to  claim 1 , wherein the first intermediate output path and the second intermediate output path are disposed in parallel to each other; and
 the first planetary gear set, the second planetary gear set and the third planetary gear set are disposed one after another to be concentric with the second axial center so as to be placed between the first intermediate output path and the second intermediate output path.   
   
   
       3 . A planetary gear type multistage transmission for vehicles according to  claim 1 , wherein the first planetary gear set is a single-pinion type planetary gear set provided with a first sun gear, a first carrier and a first ring gear and having a first planetary gear rotatably supported by means of the first carrier; the second planetary gear set is a single-pinion type planetary gear set provided with a second sun gear, a second carrier and a second ring gear and having a second planetary gear rotatably supported by means of the second carrier; and the third planetary gear set is a single-pinion type planetary gear set provided with a third sun gear, a third carrier, and a third ring gear and having a third planetary gear rotatably supported by means of the third carrier;
 the first rotary element includes the first sun gear; the second rotary element includes the second ring gear; the third rotary element includes the second carrier and the third ring gear; the fourth rotary element includes the first carrier, the second sun gear and the third carrier; and the fifth rotary element includes the first ring gear and the third sun gear.