A multi-speed transmission with planetary gear structure

Abstract

A multiple-gear transmission with a planetary gear structure comprises a housing, an input member, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a first interconnection member, a second interconnection member, a third interconnection member, a fourth interconnection member, a fifth interconnection member, a sixth interconnection member, a seventh interconnection member, a first torque transfer device, a second torque transfer device, a third torque transfer device, a fourth torque transfer device, a fifth torque transfer device and a sixth torque transfer device, wherein the first planetary gear set, the second planetary gear set and the third planetary gear set are sequentially arranged from the input end to the output end, the first torque transfer device, the second torque transfer device, the third torque transfer device, the fourth torque transfer device, the fifth torque transfer device and the sixth torque transfer device include three brakes and three clutches, and the first torque transfer device, the second torque transfer device and the third torque transfer device are located between the second planetary gear set and the third planetary gear set and are parallelly close to the housing. The fourth torque transfer device, the fifth torque transfer device and the sixth torque transfer device are located between the first planetary gear set and the second planetary gear set, the fourth torque transfer device is close to a rotation center, the fifth torque transfer device and the sixth torque transfer device are parallelly located above the fourth torque transfer device, and all the members are located in the housing. The multiple-gear transmission is compact in structure.

Description

technical field [0001] The invention relates to a multi-speed transmission with a planetary gear structure, in particular to an automatic transmission applied to motor vehicles, and belongs to the technical field of motor vehicle transmissions. Background technique [0002] The planetary gear structure is widely used in the field of automotive automatic transmissions due to its advantages of compact structure and large load capacity. An automatic transmission with a planetary gear structure needs to achieve different forward and reverse gears by combining different shifting elements such as brakes and clutches. [0003] In addition, on May 30, 2004, US 6,712,731 B1 disclosed a multi-degree-of-freedom automatic transmission power transmission system with seven forward gears and one reverse gear. This series of transmissions contains three planetary gear sets with six power shift elements, and two fixed structural connections. The powertrain includes an engine and a torque c...

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