Synthesis planetary-layshaft transmission with single transition shifts

International Conference of Young Scientists and Students "Topical Problems of Mechanical Engineering 2018"

Salamandra, Konstantin B^1

Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN), Maliy Kharitonievsky per., 4, Moscow

101990, Russia^1

关键词: Automatic transmission;    Gear ratios;    Planetary gear sets;    Speed ratio;    Transition shifts;    Transmission design;    Transmission speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/489/1/012061/pdf
DOI  :  10.1088/1757-899X/489/1/012061

来源: IOP

【 摘 要 】

The more speeds in the automatic transmission, the better the fuel economy and the vehicle drivability. More speeds in conventional transmissions consisting only of planetary gear sets or only of gears with fixed axles lead to increase gears and shifting elements, which complicating the transmission design and growing the overall dimensions and weight. One of the ways to obtain simple transmission designs providing a great number of speeds with a relatively small number of gears and shifting elements is to use combinations of planetary gear sets and gears with fixed axles (planetary-layshaft transmissions). The main disadvantage that limits the use of planetary-layshaft transmissions is the presence of double and triple transition shifts in which 2 or 3 pairs of shifting elements are switched on and off at the same time. The problem to find out a set of speed ratios realized by the transmission with single transition shift sequences is solved in the paper on example of a planetary-layshaft transmissions consisting of two differentials and three sets of gears with fixed axles. The gear ratios magnitudes which satisfying obtained set of transmission speed ratios were found.