Planetary gear train for an automatic transmission of a vehicle

Abstract

The present invention provides a planetary gear train for an automatic transmission of a vehicle, which includes: an input shaft and an output shaft, first to fifth planetary gear sets, a first shaft, a second shaft, a third shaft, and a fourth shaft , the fifth shaft, the sixth shaft, the seventh shaft, the eighth shaft and the ninth shaft; the first to fifth planetary gear sets respectively have the first to third, fourth to sixth, seventh to ninth, and The tenth to twelfth and thirteenth to fifteenth rotation elements; the first shaft is connected to the second rotation element and the input shaft; the second shaft is connected to the fourteenth rotation element and the output shaft; the third shaft is connected to the ninth rotation The element is connected with the thirteenth rotation element; the fourth shaft is connected with the tenth rotation element and the fifteenth rotation element; the fifth shaft is connected with the third and seventh rotation elements; the sixth shaft is connected with the sixth rotation element; the seventh The shaft is connected with the fifth, eighth and eleventh rotation elements; the eighth shaft is connected with the first and fourth rotation elements; and the ninth shaft is connected with the twelfth rotation element.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2017-0058305 filed on May 10, 2017, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an automatic transmission for a vehicle. Background technique [0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0005] In the field of automatic transmissions, more diverse gear shifting techniques are useful for improving fuel consumption and drivability of vehicles. [0006] By improving the uniformity of acceleration before and after the shift, etc., the realization of more shift gears helps to improve the performance and efficiency of vehicles in the trend of so-called engine downsizing, and the step ratio of the shift gears The more linearization improves the drivability of th...

AI Technical Summary

Problems solved by technology

[0011] In addition, we have found that even though the ratio range may be raised above 9.0 steps, the eight-speed automatic transmission may become less linear in shifting gear ratios

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