Automotive Transmission System
-
Upload
aalekh-prajapati -
Category
Documents
-
view
227 -
download
2
Transcript of Automotive Transmission System
-
7/28/2019 Automotive Transmission System
1/35
AUTOMOTIVETRANSMISSION SYSTEM
-
7/28/2019 Automotive Transmission System
2/35
CONTENTS
Introduction
Process
Types of Transmission System (Rear & Front)
Components of Transmission in Automobiles
1. Hydraulic System
1. Oil Pump
2. Valve Body
3.Clutch Packs
4. Bands
2. Seals and Gaskets
3. Torque Converter4. Governor, Vacuum Modulator, Throttle Cable
5. Computer Controls
-
7/28/2019 Automotive Transmission System
3/35
INTRODUCTION
The transmission is a device that is connected to the back of theengine and sends the power from the engine to the drive wheels.
The main aim of an automotive transmission system is to providehigh torque at the time of starting the engine, hill climbing,accelerating and pulling the engine at high loads.
The job of the transmission is to change the speed ratio betweenthe engine and the wheels of an automobile.
-
7/28/2019 Automotive Transmission System
4/35
POSITION OF TRANSMISSION
-
7/28/2019 Automotive Transmission System
5/35
T
R
A
N
S
M
I
S
S
I
O
N THE 6L50 TRANSMISSION IS A HYDRA-MATIC SIX-SPEALL-WHEEL DRIVE AUTOMATIC TRANSMISSION PROD
SEE MORE TRANSMISSION
S
Y
S
T
E
M
-
7/28/2019 Automotive Transmission System
6/35
PROCESS
An automobile engine runs at its best at a certain RPM range and itis the transmission's job to make sure that the power is delivered tothe wheels while keeping the engine within that range.
The transmission uses a range of gears -- from low to high
To make more effective use of the engine's torque as drivingconditions change.
The gears can be engaged manually or automatically.
-
7/28/2019 Automotive Transmission System
7/35
TYPES
Rear wheel drive
Front wheel drive
-
7/28/2019 Automotive Transmission System
8/35
REAR WHEEL DRIVE
The transmission is usually mounted to the back of the engine.
Power flow on this system is simple and straight forward goingfrom the engine, through the torque converter , then through thetransmission and drive shaft until it reaches the final drive where itis split and sent to the two rear wheels .
-
7/28/2019 Automotive Transmission System
9/35REAR WHEEL DRIVE LAYOUT
-
7/28/2019 Automotive Transmission System
10/35
FRONT WHEEL DRIVE
On a front wheel drive car, the transmission is usually combined with the finform what is called a transaxle.
Transaxle is a device set up in the transmission gear box, clutch, final drive,in a single unit.
Front wheel drive layouts are those in which the wheels of the vehicle are
Front axles are connected directly to the transmission to provide power to wheels.
This layout is typically chosen for its compact packaging.
-
7/28/2019 Automotive Transmission System
11/35FRONT WHEEL DRIVE LAYOUT
-
7/28/2019 Automotive Transmission System
12/35
COMPONENTS OF TRANSMISSIONSYSTEM
Planetary Gear Sets Hydraulic System
Oil Pump
Valve Body
Clutches
Band
Seals and Gaskets Torque Converter Governor
Computer Controls
http://www.familycar.com/Transmission.htmhttp://www.familycar.com/Transmission.htmhttp://www.familycar.com/Transmission.htmhttp://www.familycar.com/Transmission.htmhttp://www.familycar.com/Transmission.htm -
7/28/2019 Automotive Transmission System
13/35
PLANETARY GEAR SETS
A gear set in which all of the gears are in one plane, grouped aroundeach other like the planets around the sun.
The central gear is called the "sun gear". In mesh with it is a circular
grouping of gears, called "planet gears", mounted on a rotating carrier.
The planet gears also engage teeth on the inner periphery of the "ringgear".
By holding any one of the three gear elements motionless, differentratios can be produced between the other two. Planetary gear sets arecommon in automatic transmissions.
-
7/28/2019 Automotive Transmission System
14/35
-
7/28/2019 Automotive Transmission System
15/35
-
7/28/2019 Automotive Transmission System
16/35
SIDE VIEW
-
7/28/2019 Automotive Transmission System
17/35
A clutch is a mechanical device which provides for the transmission of power (therefore usually motion) from one component (the driving member) to anothdriven member).
The simplest application clutches are employed in devices which have two rotshafts.
CLUTCH PACKS
-
7/28/2019 Automotive Transmission System
18/35
-
7/28/2019 Automotive Transmission System
19/35
BANDS
A band is a steel strap with frictionmaterial bonded to the insidesurface.
One end of the band is anchoredagainst the transmission case whilethe other end is connected to aservo.
A flexible metal ring fits aroutside of the clutch housto engage the gears, and release them.
-
7/28/2019 Automotive Transmission System
20/35
-
7/28/2019 Automotive Transmission System
21/35
TORQUE CONVERTER
-
7/28/2019 Automotive Transmission System
22/35
TORQUE CONVERTER
A torque converter isa fluid coupling that
is used to transferrotating power froma prime mover, suchas an internalcombustion engine orelectric motor, to arotating driven load.
http://en.wikipedia.org/wiki/Fluid_couplinghttp://en.wiktionary.org/wiki/prime_moverhttp://en.wikipedia.org/wiki/Internal_combustion_enginehttp://en.wikipedia.org/wiki/Internal_combustion_enginehttp://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Internal_combustion_enginehttp://en.wikipedia.org/wiki/Internal_combustion_enginehttp://en.wiktionary.org/wiki/prime_moverhttp://en.wikipedia.org/wiki/Fluid_coupling -
7/28/2019 Automotive Transmission System
23/35
-
7/28/2019 Automotive Transmission System
24/35
HYDRAULIC SYSTEM
The Hydraulic system is a complex maze of passages andtubes that sends transmission fluid under pressure to allparts of the transmission and torque converter
It works with some components.
Oil Pump
Valve Body
-
7/28/2019 Automotive Transmission System
25/35
OIL PUMP
The transmission oil pump(not to be confused with the pump
element inside the torque converter) is responsible for producingall the oil pressure that is required in the transmission. The oil pumpis mounted to the front of the transmission case and is directlyconnected to a flange on the torque converter housing.
-
7/28/2019 Automotive Transmission System
26/35
VALVE BODY
The valve body is the control center of the automatic
transmission. It contains a maze of channels and passages thatdirect hydraulic fluid to the numerous valves which then activatethe appropriate clutch pack or band servo to smoothly shift tothe appropriate gear for each driving situation
-
7/28/2019 Automotive Transmission System
27/35
-
7/28/2019 Automotive Transmission System
28/35
COMPUTER CONTROLS
The computer uses sensors on the engine and transmission tdetect such things as throttle position, vehicle speed, enginespeed, engine load, brake pedal position, etc. to control exashift points as well as how soft or firm the shift shouldbe. Once the computer receives this information, it then sesignals to a solenoid pack inside the transmission
-
7/28/2019 Automotive Transmission System
29/35
NON-COMPUTERIZED
TRANSMISSIONS
Governor
Vacuum Modulator
Throttle Cable
Seals and Gaskets
-
7/28/2019 Automotive Transmission System
30/35
SEALS & GASKETS
An automatic transmission has many seals and gaskets to controlthe flow of hydraulic fluid and to keep it from leaking out. Thereare two main external seals:
The front seal
The rear seal.
-
7/28/2019 Automotive Transmission System
31/35
FRONT & REAR SEAL
The front seal seals the point where the torque converter mountsto the transmission case.
This seal allows fluid to freely move from the converter to the
transmission but keeps the fluid from leaking out. The rear seal keeps fluid from leaking past the output shaft.
A gasket is a type of seal used to seal two stationary parts thatare fastened together.
-
7/28/2019 Automotive Transmission System
32/35
GOVERNOR, VACUUM MODULATOR& THROTTLE CABLE
These three components provide the inputs that tell the transmission when toshift.
Governor regulates the mean speed of the engine.
The Throttle Cable simply monitors the position of the gas pedal through acable that runs from the gas pedal to the throttle valve in the valve body.
The Vacuum Modulator monitors engine vacuum by a rubber vacuum hosewhich is connected to the
engine.
-
7/28/2019 Automotive Transmission System
33/35
-
7/28/2019 Automotive Transmission System
34/35
-
7/28/2019 Automotive Transmission System
35/35