A six-speed planetary automatic transmission

Abstract

The invention discloses a six-gear automatic planetary gearbox which comprises an input component, an output component, five driving components, four brakes, two clutches and four planetary gear trains. The gearbox is provided with four planetary gear trains, four brakes and two clutches, so that six forward gears and one reverse gear are achieved, a third planet carrier is integrally connected with a fourth planet carrier, so that the whole structure is more compact, power output of the six forward gears and one reverse gear can be achieved, the four planetary gear trains are single simple planetary gear trains, k values of the four planetary gear trains range from 1.5 to 3.5, so that compactness of the whole structure of the gearbox is facilitated, the size of the gearbox is shortened, the weight of the gearbox is lightened, light weight of the gearbox is achieved, and the gearbox has advantages of uniform transmission ratio, excellent performance and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission, in particular to a six-speed planetary automatic transmission. Background technique [0002] The transmission system is one of the basic components of the vehicle. It is used to transmit the engine power, and can change the speed and traction of the vehicle as required when driving in a straight line. The transmission system also realizes the reversing and parking of the vehicle. The transmission is a very important part of the transmission system. At present, the seven-speed planetary automatic transmission for mainstream road vehicles has a relatively large speed ratio between the first gear and the second gear, which is reflected in the output speed. The fluctuation of the output speed is relatively large. During the running process, it is easy to produce shifting shock, unstable work, etc., that is, there will be a great shifting frustration when shifting from the first gear ...

AI Technical Summary

Problems solved by technology

At present, the seven-speed planetary automatic transmission for mainstream road vehicles has a relatively large speed ratio between the first gear and the second gear, which is reflected in the output speed. The fluctuation of the output speed is relatively large. During the running process, it is easy to produce shifting shock, unstable work, etc., that is, there will be a great shifting frustration when shifting from the first gear to the second gear or from the second gear to the first gear, which seriously affects the comfort and fuel economy. sex

For example, the speed ratios of the five gears of the planetary gear transmission mechanism of the HT750DRD hydraulic transmission produced by the U.S. ALLISON company are i1=7.97, i2=3.19, i3=2.07, i4=1.4, i5=1, and one of the speed ratios is the same as The speed ratio of the second gear has a large difference, which is not conducive to the operation of some working machines that need to switch between high and low speeds frequently

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