Three-planet-row automatic transmission and vehicle

Abstract

The invention relates to the field of automobiles, and discloses an three-planet-row automatic transmission and a vehicle. The transmission comprises an input component, an output component, a first planet row, a second planet row, a third planet row, a first clutch, a second clutch, a third clutch, a first brake, a second brake and a third brake, wherein the input component is fixedly connected with a second sun gear, and the output component is fixedly connected with a third planet carrier; and a second planet carrier is fixedly connected with a third gear ring, a first gear ring is fixedlyconnected with the third planet carrier, and a third sun gear is fixed. According to the three-planet-row automatic transmission, the first brake is closed to brake a first rear sun gear, the second brake is closed to brake a first front sun gear, and the third brake is closed to simultaneously brake the first planet carrier and a second gear ring; and the first rear sun gear is connected with theinput component through the first clutch, the first planet carrier is connected with the second sun gear through the second clutch, and the first planet carrier is connected with the second gear ringthrough the third clutch.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a three-planetary automatic transmission and a vehicle. Background technique [0002] The gear train mechanism of the electronically controlled hydraulic transmission generally includes multiple planetary arrays, and the engine power is transmitted to the planetary gear transmission mechanism through the hydraulic torque converter for gear shifting and then output. The volume, weight, efficiency and carrying capacity of the automatic transmission are directly related to the layout of the planetary row structure. The more gears of the automatic transmission drive train, the lower the fuel consumption of the car and the better the economy. However, as the number of gears increases, the number of planetary rows and the number of operating clutches and brakes also increase, and it is even more difficult to achieve a design that satisfies the theoretical step ratio. [0003] At present, t...

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Problems solved by technology

[0004] However, the Shengrui horizontal SR8AT-300 scheme includes four pairs of fixed-shaft constant mesh gears on the intermediate shaft, which increases the number of transmission components and is not conducive to the compact structure; Aisin's eight-speed TR-80SD scheme and Hyundai Power The Thai eight-speed A8L / TR1 schemes all adopt the Lavina structure, and the structure of the double planetary gear set appears, which makes the structure of the transmission too complicated, which is not conducive to the lightweight design of the transmission

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