Study On Design Of At With Planetary Gear Institutions

Automatic transmission can give automobile comfortable driving and gear shifting,smooth starting and convenient operation . It is a very important Invention in the development of transmission technology for vehicle. Planetary gear-box is widely used in AT for its many virtues. Automatic transmission meanly use hydraulic torque converter and planetary gear-box, which is called hydraulic automatic transmission (AT). It can power transmission, realize shifting and larger torque converter area, which also has reverse and empty gear shift, large shifting ratio, comfortable operation and small volume. The fatal weakness of AT is the low efficiency which is obviouslylower than manual transmission. It's the product of efficiency for planetary gear-box and hydraulic torque converter.For trying to improve hydraulic automatic transmission, and improve the transmission efficiency of dynamic performance, this paper mainly to hydraulic transmission planet gear mechanism as the research object, its transmission principle, transmission scheme, the transmission efficiency are analyzed, and the planetary gear transmission part design research institutions. The research content as follows:1) according to the commonly used planetary gear shift agencies of automatic transmission characteristics of a dual planetary platoon type 4 files Simpson type automatic transmission as the research object. And analyzes it in each gear power transmission line when.2) according to the automatic transmission gear planets in the variable speed characteristic, take 2 k-h type planetary gear mechanism as the research object, the paper analyzes the different transmission scheme, to a different transmission ratio, different braking torque transmission efficiency and were analyzed.3) in order to improve the dynamic properties of hydraulic automatic transmission, focuses on the hydraulic automatic transmission gear planets in as the research object, the institutions of the planet gear meshing transmission efficiency are analyzed, the calculation formula is their planet mechanism of transmission, the acc, slowing down the transmission efficiency were analyzed.4) in hydraulic automatic transmission mechanical transmission in according to different kinds of constraint conditions, as well as the planet mechanism, and the calculation formula of the transmission efficiency of 2 k-h type planetary gear transmission design optimization, so as to improve the planet mechanism in the automatic transmission transmission efficiency.