What is Gear Box? What are Main Components of Gear Box?

In a gear box, the counter shaft is mashed to the clutch with a use of a couple of gear. So the counter shaft is always in running condition. When the counter shaft is bring in contact with the main shaft by use of meshing gears, the main shaft start to rotate according to the gear ratio. When want to change the gear ratio, simply press the clutch pedal which disconnect the counter shaft with engine and change connect the main shaft with counter shaft by another gear ratio by use of gearshift lever. In an gear box, the gear teeth and other moving metal must not touch. They must be continuously separated by a thin film of lubricant. This prevents excessive wear and early failure. Therefor a gearbox runs partially filled with lubricant oil.

Also Read: Differential Gear & Its Working

Function of transmission box (gear box) in automobile:

The transmission box which is also known as the gear box is the second element of the power train in an automobile. It is used to change the speed and torque of vehicle according to variety of road and load condition. Transmission box change the engine speed into torque when climbing hills and when the vehicle required. Sometimes it is known as torque converter. Main functions of a gear box is as follow:

  1. Provide the torque needed to move the vehicle under a variety of road and load conditions. It does this by changing the gear ratio between the engine crankshaft and vehicle drive wheels.
  2. Be shifted into reverse so the vehicle can move backward.
  3. Be shifted into neutral for starting the engine.

Watch video below – Gear box operation with clutch 




  1. محمد ابو النصر November 19, 2017
  2. محمد ابو النصر November 19, 2017
  3. Asfaw January 24, 2018
  4. Priya March 9, 2018
  5. Santhosh July 22, 2018

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