Eight-gear transmission

Abstract

The invention provides an eight-gear transmission. The eight-gear transmission mainly comprises an input shaft, an output shaft, planetary gear rows, a connecting component and torque transmission devices, wherein all the components are arranged in a transmission shell. Each planetary gear row comprises a sun gear, a gear ring, a planet carrier and a planet gear supported by the planet carrier. The torque transmission devices comprise two clutches and four brakes, wherein the two clutches and the four brakes are selectively connected to enable the sun gears, the planet carriers, the gear rings and one of the five connecting components to rotate or be fixed. Furthermore, at least two of the torque transmission devices can be selectively combined so that eight forward gear speed ratios and a reverse gear speed ratio can be established between the input shaft and the output shaft, and forward gears include five deceleration gears, one direct gear and two overgears. The transmission is compact in structure, lighter and small and can be arranged easily on an automobile. The step speed ratio between the transmission ratios of the gears of the transmission meets the requirement of the transmission.

Description

technical field [0001] The invention relates to an eight-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 a fixed gear is determin...

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 gear train consisting of four planetary gears, 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 problems of small speed ratios and low transmission stability

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