WHAT IS THE FUNCTION OF GEAR BOX IN THE AUTOMOBILE


Major components of automobile comprises of parts, components and accessories for all kinds of common automotive vehicles, such as cars, light commercial vehicles, heavy commercial vehicles, buses, trucks and trailers; note that motorcycles and bicycles are excluded.

 

 

List of the components of automobile:

 

The automobile can be considered to consist of five basic components:

 

(a) The Engine or Power Plant: It is source of power.

(b) The Frame and Chassis: It supports the engine, wheels, body, braking system, steering, etc.

(c) The transmission system which transmits power from the engine to the car wheels. It consists of clutch, transmission, shaft, axles and differential.

(d) The body.

(e) Accessories including light, air conditioner/hearer, stereo, wiper, etc.
Introduction:

            There are various components of an automobile and each component has a specific function to drive the automobile.

Functions:

Chassis and Frame

The chassis is formed by the frame with the frame side members and cross members.
The frame is usually made of box, tubular and channel members that are welded or riveted together. In addition to this, it comprises of the springs with the axles and wheels, the steering system and the brakes, the fuel tank, the exhaust system, the radiator, the battery and other accessories.
Along with this the frame supports the body.
 

Engine or power plant

The engine is the power plant of the vehicle. In general, internal combustion engine with petrol or diesel fuel is used to run a vehicle. An engine may be either a two-stroke engine or a four-stroke engine.
An engine consists of a cylinder, piston, valves, valve operating mechanism, carburetor (or MPFI in modern cars), fan, fuel feed pump and oil pump, etc.
 

Transmission System (Clutch and Gear Box)

 The power developed by the engine is transferred to the wheels by transmission system. Transmission system must do three jobs:

It must provide varying gear ratios. Number of gear ratios is equal to number of gears in a vehicle.
It must provide a reverse gear for moving vehicle in reverse direction.
It must provide a neutral or disconnecting arrangement so that the engine can be uncoupled from the wheels of the vehicle. In a conventional transmission system, there is a clutch, a manually operated transmission (gear box), a propeller shaft and a differential or final drive.
 

Clutch

The purpose of the clutch is to allow the driver to couple or decouple the engine and transmission. When clutch is in engaged position, the engine power flows to the transmission through it (clutch).
When gears are to be changed while vehicle is running, the clutch permits temporary decoupling of engine and wheels so that gears can be shifted.
In a scooter, the clutch is operated by hand where as in a car the clutch is operated by foot. It is necessary to interrupt the flow of power before gears are changed. Without a clutch, it will be very difficult.
 

Final Drive

Final drive is the last stage in transferring power from engine to wheels. It reduces the speed of the propeller shaft (drive shaft) to that of wheels. It also turns the drive of the propeller shaft by an angle of 90 degree to drive the wheels.
 

Braking System

Brakes are used to slow down or stop the vehicle. Hydraulic brakes are generally used in automobiles, where brakes are applied by pressure on a fluid. Mechanical brakes are also used in some vehicles. These brakes are operated by means of leavers, linkages, pedals, cams, etc.
 Hand brake or parking brake is usually a mechanical brake. These are used for parking the vehicles on sloppy surfaces and also in case of emergency.
 

Gear Box

Gear box contain gearing arrangement to get different speeds. Gears are used to get more than one speed ratios. When both mating gears have same number of teeth, both will rotate at same number speed. But when one gear has fewer teeth than other, the gear with less number of teeth will rotate faster than larger gear.
In a typical car, there may be six gears including one reverse gear. First gear gives low speed but high torque. Higher gears give progressively increasing speeds. Gears are engaged and disengaged by a shift lever.

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