AUTOMATIC TRANSMISSIOS IN

AUTOMOBILES

BY; PRAVEEN KUMAR.V III-MECHANICAL ENGINEERING AAA COLLEGE OF ENGINEERING AND TECHNOLOGY VIRUDHUNAGAR

INTRODUCTION AUTOMATIC TRANSMISSION IN TODAYS

AUTOMOBILES IS VERY A COMPLICATED ONE

AUTOMATIC TRANSMISSION CONTAINS 1. MECHANICAL SYSTEMS,2. HYDRAULIC SYSTEMS,3. ELECTRICAL SYSTEMS AND4. COMPUTER SYSTEMS.

WHAT IS TRANSMISSION Transmission is the device that is

connected to the back of the engine and send the power from the engine to the drive wheel.

Purpose of the transmission is to provide high torque at the time of starting and moving the vehicle, at the time of hill climbing.

TYPES OF AUTOMATIC TRANSMISSION

REAR WHEEL DRIVE

FRONT WHEEL DRIVE

REAR WHEEL DRIVE In most of the vehicles transmission is

mounted on the rear wheels

POWER FLOW ON THIS SYSTEM IS SIMPLE AND STRAIGHT FORWARD GOING FROM THE ENGINE, THROUGH THE TORQUE CONVERTER, THEN ALSO THROUGH THE DRIVE SHAFT UNTIL IT REACH THE FINAL DRIVE WHERE IT SPLIT AND SENT TO THE TWO REAR WHEEL.

FRONT WHEEL DRIVE On a front wheel car, the transmission

is combined with engine itself and is called as transaxle.

TRANSAXIL Transaxil is a device setup in the

transmission gear box, clutch, finaldrive, which all are into a single unit.

AUTOMATIC TRANSMISSION COMPONENTS

Planetary gear sets Hydraulic systems

1. Oil pump2. Valve body3. Clutches4. Band

Seals and gaskets Torque converters Governor Computer controls

PLANETARY GEAR SETS All gear set in which all of

the gears are in one planet.

The control gear is called as sun gear, in mesh with the circular grouping of gears called planet gears

SIDE VIEW OF THE PLANETARY GEARS

CLUTCH PACKS A clutch is a machanical device for the

transmission power from one component to another.

BANDS A band is a steel strap with friction material

bonded to the inside surface A flexible metal ring fits around the outside

of the clutch hosing. It tichtends to engage the gears, and loosens to release them.

TORQUE CONVERTOR

TORQUE CONVERTORA torque convertor is

a fluid coupling that is used to transfer rotating power from a prime mover, such as an internal combustion engine or electric motor to a rotating driven load

COMPUTER CONTROLSThe computer uses sensor on the

engine and transmission to detect such things as throttle position ,vehicle speed, engine load, break pedal position, etc…

Once the computer receives this information then it will sends signal to a solenoid pack inside the transmission

AFTER FITTING ALL AUTOMATIC TRANSMISSION COMPONENTS,

ORDINARY CAR’S GEAR

AUTOMATIC TRANSMISSION CAR’S

GEAR

AUTOMATIC TRANSMISSION IN FOUR WHEEL DRIVE

CONCLUSIONAll the cars in india are changing to automatic transmission. They are better than the manual transmission both in performance and pickup in normal roads and in hill climbing…

ANY QUESTIONS