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Home> Learn> Automotive Articles -Transmission Gear Box


Transmission Gear Box


 




 
 

 

 

 The gearbox provides a range of gearing, to multiply the engine's torque to overcome the car's inertia to get moving, as well as providing it with reasonable speed capability.

 

A direct connection between the engine and the road wouldn't provide torque at the wheels to get the car moving and even if it did it would quickly run out of revs. So the gearbox provides a range of gearing, to multiply the engines torque to overcome the car's inertia and get it moving, as well as providing a reasonable speed capability. It also allows the car to do this in a straight line, as well as going around corners.

 

There are three main types of gearbox:

Front engine - front wheel drive

Front engine - rear wheel drive

Rear engine - rear wheel drive

 

The typical FWD unit is compact and will house the gears (known as the gear set, kit or cluster), the final drive and the differential. Typically, there will be two shafts with gears on them- an input shaft and below it, an output shaft. each pair of gears is constantly meshing, but only one pair is fixed to the shafts at any time.

 

A typical RWD gearbox will have three shafts - input, lays half and output. The input and output shafts run in line with each other but are mechanically separated. The lay shaft sits beneath the two and overlaps them. The input shaft constantly drives the lay shaft through a pair of meshing gears this is "constant mesh". The lay shaft and output shaft have a pair of gears rotating on them and from the constant mesh gearing onwards it behaves in a similar way to the FWD gearbox. The main extra aspect is that if the box features a direct ratio, usually fourth, there will be a system to lock the two shafts together, bypassing the gear cluster.

 

 

 


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