Improved nine-gear transmission

Abstract

The invention provides an improved nine-gear transmission. The improved nine-gear transmission mainly comprises an input shaft, an output shaft, planet gear rows, connecting components and torque transmission devices. All the components are arranged in a transmission shell. Each planet gear row comprises a sun gear, a planet carrier, a planet gear and a gear ring. Each torque transmission device comprises two clutches and four brakes, wherein the two clutches and the four brakes are selectively jointed, and then the sun gears, the planet carriers and the gear rings or one of the four connecting components rotate or are / is fixed; the torque transmission devices can be selectively jointed in a combining form of at least two torque transmission devices; and nine forward gear speed ratios and a reverse gear speed ratio are established between the input shaft and the output shaft, and nine forward gears include the five deceleration gears, one direct gear and the three overspeed gears. The transmission is compact in structure, low in weight and small in size, and is easily arranged on an automobile, and the speed ratio step change between the transmission ratios of all the gears of the transmission meet the requirements of the transmission.

Description

technical field [0001] The invention relates to an improved nine-speed transmission, which belongs to the technical field of vehicle 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 mainly starts from the following two aspects. One is performance, specifically including the range of transmission ratio, responsiveness and smoothness; the other is packaging, mainly reducing size and weight. When the gear is determined, The number of components required to achieve fixed gears is d...

AI Technical Summary

Problems solved by technology

The Chinese invention application "eight-speed transmission" (application number: CN201410829472) and the Chinese invention application "CN201410826601-a transmission with a wider range of speed change" (application number: CN201110094929) both disclose a four-planetary gear train, six An eight-speed transmission composed of a torque transmission device and four connecting members. The above two transmissions both realize eight forward gear ratios and one reverse gear ratio, but there are fewer gears, smaller speed ratios, and lower transmission stability. question

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