![]() The gears are connected to the corresponding gears of the countershaft. Two gears mounted on the splined main shaft can be slid by the shifter yoke when the shift lever is operated. Three other gears like first speed, second speed, and reverse speed gear are also rigidly fixed to the countershaft or also known as layshaft. It remains always connected to the drive gear of the counter-shaft. The clutch gear is fixed to the clutch shaft. The gear housing and bearing are not shown. ![]() The arrangement of gears is in a neutral position. Read also: 6 Most Common Gearbox Problems Sliding Mesh Type GearBox The vehicle speed is also changed with the help of the transmission keeping the engine speed the same with a certain limit. This is enclosed in a metal box called a gearbox. Hence a device must be provided to permit the engine crankshaft to revolve at a relatively high speed, while the wheels turn at slower speeds. When a vehicle is starting from rest, hill climbing, accelerating, and meeting other resistance, high torque is required at the driving wheels. The purpose of the transmission is to provide high torque at the time of starting, hill climbing, accelerating, and pulling a load. Epicyclic gearbox Purpose of Transmission.Following are the types of gearbox used in modern vehicles:
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