The direct connection between the engine and the road

The direct connection between the engine and the road
The gearbox provides a range of gearing, to multiply the engine's torque to overcome the car's inertia and get it moving, as well as providing it with a reasonable speed capability.
A direct connection between the engine and the road wouldn't provide enough torque at the wheels to get the car moving. And even if it did, the engine would quickly run out of revs. So the gearbox provides a range of gearing, to multiply the engine's torque to overcome the car's inertia and get it moving, as well as providing it with a reasonable speed capability. It also allows the car to do this in a straight line, as well as going round corners.
There are different types of gearbox: such as , Helical Gear box, Bevel Gear Box and any other gearboxes. All of them are widely used in our daily life.