Multi-gear speed changer for planetary gear structure

Abstract

The invention relates to a multi-gear speed changer for a planetary gear structure. The multi-gear speed changer comprises a casing, an input component, an output component, first, second and third planetary gear groups, first, second, third, fourth, fifth, sixth and seventh interconnecting components and first, second, third, fourth, fifth and sixth torque transmission devices, wherein the first, second and third planetary gear groups are sequentially arranged from an input end to an output end, the six torque transmission devices comprise three brakes and three clutches, the first torque transmission device is positioned at the left side of the first planetary gear group and is arranged at the same side as the input component, the second and the third torque transmission devices are positioned between the second and third planetary gear groups in a parallel way and are near the casing, the fourth, fifth and sixth torque transmission devices are positioned between the first and second planetary gear groups, the fourth torque transmission device is near a rotating center, the fourth and sixth torque transmission devices are respectively positioned above the fourth torque transmission device, and all of the components are positioned in the casing. The multi-gear speed changer provided by the invention belongs to a multi-gear speed changer with a compact 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...

AI Technical Summary

Problems solved by technology

[0005] Although there are a lot of introductions in the prior art of automatic transmissions using planetary gear structures, there is still a lot of room for improvement in the prior art considering factors such as the number of gears, transmission ratio range, efficiency, transmission size and weight, etc.

Especially in order to increase the number of gears of the automatic transmission, the number of planetary gear sets, clutches and brakes also increases accordingly, resulting in an oversized transmission, which is not conducive to the arrangement of the transmission in the vehicle drive train

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