Ninth-gear transmission

Abstract

The invention discloses a ninth-gear transmission. The ninth-gear transmission comprises a transmission outer shell, an input shaft, an output shaft, a planetary gear row set, a coupling component setand a torque transmitting device, wherein the input shaft, the output shaft, the planetary gear row set, the coupling component set and the torque transmitting device are installed in the transmission outer shell; each planetary gear row comprises a gear ring, a sun gear, a planetary frame and a planetary gear supported by the corresponding planetary frame; the torque transmitting device comprises two clutches and four brakes, the two clutches and the four brakes are connected selectively to enable one of the sun gears, the planetary gears, the gear rings or four coupling components to rotateor be fixed; and the torque transmitting device can be selectively connected by at least two combination modes to establish nine forward gear speed ratios and one reverse gear speed ratio between theinput shaft and the output shaft, wherein the nine forward gear ratios comprise five reduction gears, one direct gear and three over drives. The ninth-gear transmission is compact in structure, lightin weight, small in size, is easy to arrange on a vehicle, and phase steps of the speed ratios between the transmission ratios of the gears of the transmission meet the requirement of the transmission.

Description

technical field [0001] The invention relates to the technical field of vehicle transmission, in particular to a nine-speed transmission. Background technique [0002] A typical multi-speed transmission uses a combination of friction clutches, planetary gearing, and fixed interconnections to achieve multiple gear ratios. The number and physical arrangement of planetary gear sets is usually dictated by packaging, cost and desired speed ratios. While current transmissions have served their intended purpose, the need for new and improved transmission configurations is virtually constant as automobiles proliferate. [0003] The improvement of the transmission configuration is mainly from the following two aspects, one is performance, specifically including the range of transmission ratio, responsiveness and smoothness; the other is packaging, mainly the reduced size and weight, when the gear is determined, The number of components required to achieve a fixed gear is determined ...

AI Technical Summary

Problems solved by technology

The Chinese invention application "nine-speed automatic transmission" (application number: CN201510519055.8) and the Chinese invention application "nine-speed automatic transmission" (application number: CN201210002826.2) both disclose a four-planetary gear train, six torque A nine-speed transmission composed of a transmission device and five coupling members. The above two transmissions both realize nine forward gear ratios and one reverse gear ratio, but there are problems of small speed ratios and large volumes.

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