Research status of mechanical transmission of vehicle transmission
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Fund Project: Hunan Provincial Department of Education Funding Project (05D026), Hunan Chemical Vocational and Technical College Research Funding Project (Hnh2y2005B102) 71994-2015cMm Banner Jaenub male Hunan Hunan Hunan Vocational College of Chemical Technology Associate Professor fti master ssl. Mechanical design. And research. Bookmark2 1 Transmission Overview The transmission has a great influence on the power, economy and comfort of the vehicle. The transmission can be divided according to the way of operation.
There are three types of automatic transmissions: hydraulic mechanical automatic transmission Hydraulic mechanical automatic transmission (HMT) consists of a torque converter and a mechanical transmission, which are widely used in cars, buses, heavy vehicles and commercial vehicles. The torque converter is a transmission component that changes the torque by changing the momentum moment of the liquid. The hydraulic transmission has the capability of continuously variable speed and torque change, the transmission force is soft, and the vibration is absorbed. The external load is good. The automatic adjustment and adaptability make the vehicle start smoothly, accelerate quickly and evenly, and its damping effect reduces the dynamic load and torsional vibration of the drive train, prolongs the service life of the drive train, improves ride comfort, driving safety, Passivity and the average speed of the vehicle are currently the mainstream of AT.
The mechanical automatic transmission (AMT) is based on a mechanical transmission with a microcomputer-controlled electro-hydraulic servo-operated shifting mechanism that enables automatic shifting and is currently only used on some trucks.
A continuously variable automatic transmission (CVT) enables continuous variation of the transmission ratio. The CVT is available in four types: mechanical, hydraulic, static and electric. The current CVT is a mechanical push-pull metal V-belt electronically controlled AT, which has begun trial production in cars; hydromechanical transmission has the advantages of good maneuverability and high transmission efficiency, and has been used in military vehicles and engineering vehicles. Applications, but due to problems such as efficiency, noise, weight and speed limitations, have not been widely used in automobiles; electric power is used in electric vehicles (ElectricVehicle).
2 Research Status of Transmission Scheme Design Generally, mechanical and hydraulic mechanical transmissions are often in the form of fixed-axis and planetary gear transmissions.
2.1 Fixed-shaft transmission The fixed-shaft power shift transmission often adopts a multi-degree-of-freedom scheme to increase the gear position, that is, by adopting a multi-transmission series connection method; it can reduce the number of shifting clutches, and at the same time, a plurality of clutches are combined at the same time. The number of idling clutches is small.
On this basis, the dynamics simulation program of the planetary transmission with clutch only is compiled by inputting the basic characteristic matrix, and the shifting process of the Allison-T series planetary transmission 3 gears and 4 gears is calculated. Beijing: National Defense Industry Publishing house, 2 丨 å¦ å¦ ã€‚. Automotive automatic transmission - structural principle. Beijing: Mechanical Industry Press, 1999. 3 丨 Sun Dagang. Computer-aided design of the planetary gear transmission transmission diagram 4 Automotive Engineering Book Editorial Board. The transmission device of the automobile M Beijing: Mechanical Industry Press, 1993. 5 Cheng Cheng Ruiting. N-degree-of-freedom gearbox motion mathematical model|J Bu Automotive Engineering, 6丨 Xie Daipeng. BMW car five-speed automatic transmission 丨J Bu Shanghai Automobile, 2000 7 Li Qing, Huang Zongyi, Li Xinghua, and so on. Application of Leverage Method in Analysis of Planetary Transmission Schemes J. Journal of Tongji University, 199927(5) 581-586. 8丨黄宗益. The gearbox shift process dynamics model is 丨1丨. Tongxing University studied 9 丨 Li Xinghua. Computer Aided Analysis and Research of Vehicle Transmission System | D Bu Shanghai: Ph.D thesis of Tongji University, 2001 10 Xie Daipeng, Huang Zongyi. Mathematical model of hydraulic dynamic calculation of hydraulic mechanical automatic transmission 丨 J. Journal of Tongji University, 199826 (6) 691-695. 11丨 Liu Wei, Zhan Yonghong, Huang Zongyi, et al. Gearbox computer-aided analysis 12丨 Li Xinghua, Ye Wei, Liu Wei, et al. Mathematical model for dynamic calculation of hydraulic mechanical automatic transmission 丨 J. Journal of Tongji University, 200331 () 576-580.