Patent ID: 7422538
Filing Date: 2008-09-09
Classification: F16H

Abstract:
1. An automatic transmission for a vehicle comprising: a rotatably driven input shaft; a decelerating first planetary gear unit comprising an input rotary component that receives as input the rotation of said input shaft, a decelerated rotary component that rotates at a speed decelerated from the speed of rotation of the input rotary component and an intermediate component for transfer of rotation from said input rotary component to said decelerated rotary component; a second planetary gear unit comprising a first rotary element, a second rotary element, a third rotary element and a fourth rotary element, said second planetary gear unit receiving input of the decelerated rotation of said decelerated rotary component; a first clutch for connecting and disconnecting said input shaft to and from said second rotary element; a second clutch for connecting and disconnecting said input shaft to and from said third rotary element; a third clutch, located between said input shaft and said input rotary component, for operating the rotation of said input rotary component; a first brake for braking said intermediate component; and an output member for outputting the rotation of said fourth rotary element to drive wheels of the vehicle; wherein said automatic transmission provides at least five forward speeds and one reverse speed, and said first clutch and said second clutch are engaged together in fourth speed forward; wherein said first planetary gear unit and said third clutch are located on one axial side of said second planetary gear unit; wherein said first clutch and said second clutch are located on a side of said second planetary gear unit axially opposite said one side; and wherein said output member is disposed between (1) said second planetary gear unit and (2) said first planetary gear unit and said third clutch.