Multi-gear speed changer of planet gear structure

Abstract

A multi-gear speed changer of a planet gear structure comprises a shell, an input component, an output component, a first planet gear set, a second planet gear set, a third planet gear set, a first interconnection component, a second interconnection component, a third interconnection component, a fourth interconnection component, a fifth interconnection component, a sixth interconnection component, a seventh interconnection component, a first torque transmission device, a second torque transmission device, a third torque transmission device, a fourth torque transmission device, a fifth torque transmission device and a sixth torque transmission device. The first planet gear set, the second planet gear set and the third planet gear set are sequentially arrayed from the input end to the output end. The six torque transmission devices comprise three brakes and three clutches, and the first torque transmission device is placed over the second planet gear set and is close to the shell. The second torque transmission device is placed between the second planet gear set and the third planet gear set and is close to the shell. The third torque transmission device is placed over the first planet gear set and is close to the shell. The fourth torque transmission device and the fifth torque transmission device are placed between the first planet gear set and the second planet gear set and are close to the shell. The sixth torque transmission device is placed on the right side of the third planet gear set and is close to a rotating center. All the above components are located inside the shell. The multi-gear speed changer 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...

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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