Patent ID: 7101305
Filing Date: 2006-09-05
Classification: F16H

Abstract:
1. A planetary-gear-type multiple-step transmission for a vehicle, having a plurality of drive positions which are selectively established, said transmission comprising: a stationary member; an input rotary member; an output rotary member; a first transmission unit which is connected to said input rotary member; and a second transmission unit which is connected to said output rotary member, wherein said first transmission unit is capable of transmitting a rotary motion from said input rotary member to said second transmission unit through first and second intermediate transmitting paths such that a speed of said rotary motion transmitted through said second intermediate transmitting path is lower than a speed of said rotary motion transmitted through said first intermediate transmitting path, wherein said second transmission unit includes three planetary gear sets each having a sun gear, a carrier and a ring gear, said second transmission unit further including first and second brakes, and first, second, third and fourth clutches, wherein said second transmission unit constitutes first, second, third, fourth and fifth rotary elements, each of which is provided by at least one of the sun gears, carriers and ring gears of said three planetary gear sets, wherein said first rotary element is selectively connected to said second intermediate transmitting path through said second clutch, while being selectively connected to said stationary member through said first brake, wherein said second rotary element is selectively connected to said first intermediate transmitting path through said third clutch, wherein said third rotary element is selectively connected to said first intermediate transmitting path through said fourth clutch, while being selectively connected to said stationary member through said second brake, wherein said fourth rotary element is connected to said output rotary member, wherein said fifth rotary element is selectively connected to said second intermediate transmitting path through said first clutch, and wherein said plurality of drive positions are established by selectively engaging and releasing said brakes and said clutches.