Nine-gear transmission

Abstract

The invention discloses a nine-gear transmission. The nine-gear transmission comprises a transmission housing, an input shaft, an output shaft, a planetary gear row group, a coupling member group anda torque transmitting device, wherein the input shaft, the output shaft, the planetary gear row group, the coupling member group and the torque transmitting device are mounted in the transmission housing; each planetary gear row comprises a gear ring, a sun wheel, a planet carrier and a planet wheel supported by the planet carrier; the torque transmitting device comprises two clutches and four brakes, and the two clutches are selectively jointed with the four brakes, so that one of the sun wheels, the planet carriers, the gear rings or four coupling members rotates or is fixed, besides, the torque transmitting device can be selectively jointed in the form of combining at least two of the sun wheels, the planet carriers, the gear rings or the four coupling members, nine forward gear speed ratios and a back gear speed ratio are established between the input shaft and the output shaft, and the nine forward gear speed ratios comprise five decelerating gears, a direct gear and three overspeed gears. The nine-gear transmission disclosed by the invention is compact in structure, light in weight, small in volume, and easy to arrange on an automobile; and the phase step of a speed ratio between the transmission ratio of each gear of the transmission meets the requirements 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 gear arrangements, and fixed interconnects to achieve multiple gear ratios. The number and physical arrangement of planetary gear sets are generally dictated by packaging, cost, and desired speed ratios. While current transmissions fulfill their intended purpose, the need for new and improved transmission configurations is essentially constant as automobiles become more commonplace. [0003] The improvement of the transmission configuration mainly starts from the following two aspects, one is the performance, which specifically includes the angle of the range of transmission ratio, responsiveness and smoothness; the other is the packaging, mainly reducing the size and weight, when the gear is determined, The number of compon...

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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