GEAR BOX

                                                        GEAR BOX

                       In simple words gear boxes are used to vary the speed and torque.When driving a vehicle  usually there will be slops,curves or sudden breaking situations.So there will be a speed variation occurs.To overcome these type of situation the shifting is used.In straight roads we need accurate speed and low torque & when the vehicle slows down the speed is low and the torque need to be high.

WORKING

   Gear box has a series of gears and shaft to vary the speed and torque of the output shaft compared to the engine speed.Commonly there are two parellel shafts known as layshaft and main shaft.They are connected with a series of gears.The main shaft is a joined form of another two shafts whose ends are in geared form.These formation is used to maintain the maximum speed(top gear).The main drive from engine is  straightly connected through the lay shaft.There are a series of gears in varying size.In first gear position the smaller gear of the layshaft will meshed with the larger gear in the main shaft,and maintain the lower speed and higher torque,respectively 2^nd,3^rd gears also meshed with their pairs.In the top gear position the drive

shaft will directly meshed to the driven shaft.The gears may be spurgear or bevelgear.

Types of gear boxes

*Sliding mesh gearbox

*constant mesh gearbox

*Epicyclic gearbox

How a gearbox works?-Video-https://www.youtube.com/watch?v=Gf5tQfEBj0M