Chapter 8 Dynamics of Vehicles Sectionl Traveling Principle Since the torque T:acting on the wheels is produced by the engine and transmitted to the wheels through the driven system,therefore: T:=Tigigion T--Engine torque ig--Transmissi on ratio; io--Final drive ratio; --Mechanical efficiency of transmiss ion. The above equation should be included corresponding gear ratio and mechanical efficiency for vehicles with devices such as transfer case,wheel reduction and dydraudynamic drive unit,thus the driving force is: Ta●ig●i●n 械电子工程学 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 8 Dynamics of Vehicles Since the torque Tt acting on the wheels is produced by the engine and transmitted to the wheels through the driven system, therefore: Final drive ratio Mechanical efficiency of transmiss ion . Engine torque Transmissi on ratio 0 0 − − − − − − − − = • • • T t q g t t q g T i T i T T i i   ； ； ； The above equation should be included corresponding gear ratio and mechanical efficiency for vehicles with devices such as transfer case, wheel reduction and dydraudynamic drive unit, thus the driving force is: r T i i F t q g T t • • • = 0 Section1 Traveling Principle