Patent ID: 7267630
Filing Date: 2007-09-11
Classification: F16H

Abstract:
1. A multistage transmission comprising: a first transmission portion including a first intermediate output path for outputting rotations of an input member at a fixed transmission ratio determined in advance, and a second intermediate output path for outputting rotations of said input member after reducing the rotations at a greater transmission ratio than said first intermediate output path; and a second transmission portion in which a first rotary element, a second rotary element, a third rotary element, a fourth rotary element and a fifth rotary elements are respectively composed of one of or connected plural of respective sun gears, carriers and ring gears of a second planetary gear set, a third planetary gear set and a fourth planetary gear set each one of the five rotary elements configured to rotate integrally, and each one of the five rotary elements configured to rotate mutually independently with respect to the remaining rotary elements; and in which said first rotary element being selectively brought to a stationary state by a first brake, said second rotary element being selectively brought to a stationary state by a second brake, said third rotary element being selectively brought to a stationary state by a third brake, said fifth rotary element being selectively connected to said second intermediate output path via a first clutch, said first rotary element being selectively connected to said second intermediate output path via a second clutch, said second rotary element being selectively connected to said first intermediate output path via a third clutch directly connected thereto; and having a fourth clutch for causing said five rotary elements to rotate integral with said first intermediate output path by being engaged with said third clutch; and outputting rotations by said fourth rotary element being connected to an output member; wherein a plurality of gear stages are established by changing engagement and disengagement of said clutches and brakes.