Multi-speed automatic transmission

摘要

An multi-speed automatic transmission providing at least nine forward speeds and one reverse speed, includes four planetary gear sets, six shift control elements, an input shaft, an output shaft, and a transmission case. Each planetary gear set includes a sun gear, a pinion gear set, a carrier that rotatably supports the pinion gear set, and a ring gear. A carrier of a first planetary gear set is connected to the ring gear of a second planetary gear set and a carrier of the second planetary gear set is connected to the ring gear of the first planetary gear set. The first and second planetary gear sets are concentrically arranged in a common plane.

主权项

1. A multi-speed automatic transmission, comprising:
an input shaft; a first planetary gear set including a first sun gear, a first pinion gear set, a first carrier that rotatably supports the first pinion gear set, and a first ring gear, in which the first sun gear meshes with the first pinion gear set, and the first pinion gear set meshes with the first sun gear and the first ring gear; a second planetary gear set including a second sun gear, a second pinion gear set, a second carrier that rotatably supports the second pinion gear set, and a second ring gear, in which the second sun gear meshes with the second pinion gear set, and the second pinion gear set meshes with the second sun gear and the second ring gear; a third planetary gear set including a third sun gear, a third pinion gear set, a third carrier that rotatably supports the third pinion gear set, and a third ring gear, in which the third sun gear meshes with the third pinion gear set, and the third pinion gear set meshes with the third sun gear and the third ring gear; and a fourth planetary gear set including a fourth sun gear, a fourth pinion gear set, a fourth carrier that rotatably supports the fourth pinion gear set, and a fourth ring gear, in which the fourth sun gear meshes with the fourth pinion gear set, and the fourth pinion gear set meshes with the fourth sun gear and the fourth ring gear, wherein the first carrier is connected to the second ring gear, the second carrier is connected to the first ring gear, and the first and second planetary gear sets are concentrically arranged in a common plane, the third carrier is connected to the fourth ring gear, the fourth carrier is connected to the third ring gear, and the fourth sun gear is connected to the second carrier, and each of the first sun gear, the second sun gear, and the third ring gear are independently and releasably connected to the input shaft.