Multi-stage transmission

Abstract

The multi-speed transmission in planetary design, in particular an automatic transmission for a motor vehicle, comprises an input shaft, an output shaft, four planetary gear sets, which are arranged in a housing, a total of eight rotatable shafts, and six shifting elements, comprising brakes and couplings, whose selective intervening brings about different transmission ratio relationships between the input shaft and the output shaft, such that at least eleven forward gears and one reverse gear are able to be realized.

Description

technical field

[0001] The invention relates to a multi-stage transmission with a planetary gear structure, especially an automatic transmission for motor vehicles. Background technique

[0002] According to the prior art, automatic transmissions, in particular automatic transmissions for motor vehicles, comprise a plurality of planetary gearsets which are shifted by means of friction elements or shifting elements, such as clutches and brakes, and which are usually connected to slipping and selectable It is connected to a starting element, such as a torque converter or a fluid coupling, which is optionally equipped with a clutch.

[0003] Generally speaking, vehicle transmissions of automatically shiftable planetary gear design have already been described extensively in the prior art and are constantly being further developed and improved. These transmissions should require low structural outlay, especially a small number of shifting elements, and should avoid double shifti...

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