The role of the gearbox .
The driving force on the driving wheels of the vehicle depends on the value of the torque developed by the engine, gear ratios in the car drive system and mechanical efficiency of the drive system.
The resistance to motion of a car includes resistance: air, rolling, hills, vehicle road and inertia.
The role of the gearbox, influence of the ratio value on the value of the driving force. The use of a gearbox in a car makes it possible to change the gear ratio between the engine crankshaft and the driving wheels of the vehicle. By changing the gear ratio in the gearbox, it is possible to change the drive on the wheels of the car to a large extent and adapt it to the driving resistance (traffic) car.