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Automotive Power TrainsMachine Design & CAD - I

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Machine Design & CAD - I

Contents

Power trains1

Power train arrangements2

Transmitting units3

Conclusion 4

Power Trains

The term power train or refers to the group of components that generate power and deliver it to the road surface. This includes the engine, transmission, drive shafts, differentials, and the final wheels, drive.

POWER TRAIN ARRANGEMENT

Front Wheel drive:Is power is transmitted to the front wheel from engine.

Rear Wheel Drive: power is transmitted to the rear wheels from the engine.

PowerTrains

All Wheel drive:All the wheel are powered.

www.themegallery.com

Four Wheel Drivewww.themegallery.com

Secondary Shaft

Differential lock

Engine

Primary Shaft

Differential

Front Wheel Drive:

Characteristic

FWDMore interior spaceLess weightImproved drive train effeciency

RWD Even weight distribution Better braking  Weight transfer during acceleration

AWDMore handling and traction

Engine In an internal combustion engine the expansion of the

high temperature and pressure gases, which are produced by the combustion, directly applies force to a movable component of the engine,

Engine

Classification Numbers of cylinders Cylinders arrangement Cooling methods Fuel used Thermodynamics cycle

Engine cont.

Turbocharger

Turbochargers are forced induction system which has its compressor powered by a gas turbine running off the exhaust gases from the engine.

Purpose of super charging:

To reduce weight per power Maintain the power at high altitudes To improve power in a racing car

Turbo Chargerwww.themegallery.com

Super charger

A supercharger is a "forced induction" system which uses a compressor powered by the shaft of the engine which forces air through the valves of the engine to achieve higher flow. When these systems are employed the maximum absolute pressure at the inlet valve is typically around 2 times atmospheric pressure or more.

Clutch

A clutch is a mechanism which connects or disconnects the transmission of power from one working part to another, i.e. the crankshaft and gear box primary shaft.

Gear Box

Gear set is provided to permit the engine crankshaft to revolve at a relatively high speed while the wheels turns at slower speeds.

Each transmission gear provides a different amount of acceleration and speed. The combination of speed and acceleration is related to the power from the engine.

Driveability

Driveability is a subjective term used to describe the ability to "access" an engine's power. A naturally-aspirated engine with a wide power band will have very good driveability; putting the pedal to the floor at any speed in any gear should yield reasonable acceleration.

Power Shaft

It’s a steel tube having forged steel universal joints at each end. Its only function is to deliver the transmission output torque to the differential input pinion.

Axle assembly

Power from propeller shaft goes to the axle, ultimately to be delivered to the road wheels.

Axle: Live Axle Dead Axle Axle less transmission

Live AxleEither rotates or houses shafts that rotate.

Dead AxleThat does not transmit power like the front axle in a rear wheel drive

Axle LessWhere the wheel are mounted on two separate stub axles without having any axle joining the two wheels.

Wheels

Wheel is to support the load of the vehicle and passengers and to resist the side force, created by turning.

Sources

• www.powertrains.com/merc-us• www.autoform.com• www.wikipedia.org• www.howstuffworks.com• www.http://craig.backfire.ca/pages/autos/hor

sepower

www.themegallery.com

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