AT131 Automatic Transmission I

Student Activities WEB  Copy

 

Course Syllabus

Lesson 1: Intro To Transmissions and Transaxles

Lesson 2: Planetary Gear Sets And Power Flow

Lesson 3: Hydraulic Basics

Lesson 4: Transmission Pumps

Lesson 5: Hydraulic Controls

Lesson 6: Apply Devices

Lesson 7: Torque Converters

Lesson 8: Automatic Transmission Fluids, Filters & Coolers

 

 

AT131 Automatic Transmission I

Spring 2003

Instructor: Darrell Hanan

Office:  Room 3101………………….Phone:441-4228

Office Hours:  3:00-4:00   Mon.-Fri.

E-mail:  dhanan@eicc.edu

Web:  http://faculty.eicc.edu/dhanan/

Text:  Automatic Transmissions and Transaxles 2nd Ed. By Birch & Rockwood

 

 

COURSE DESCRIPTION: This course is designed to provide basic knowledge in the diagnosis and repair of the automatic transmission. The student will develop skills necessary to perform in-car automatic transmission service. The student will also develop an understanding of the operation and service of torque converters, planetary gear trains and hydraulic components used in automatic transmissions. In-car service, as well as, removal-installation and overhaul procedures will be stressed in the lab portion of this course.

 

GENERAL COURSE GOALS:

In this course the student will develop skills necessary to perform in-car automatic transmission service. The student will also develop an understanding of the operation and service of torque converters, planetary gear trains and hydraulic components used in automatic transmissions. In-car service as well as Removal-installation and overhaul procedures will be stressed in the lab portion of this course.

 

POLICIES ON ACADEMIC DISHONESTY CAN BE FOUND IN THE EICCD STUDENT CODE OF CONDUCT PUBLISHED IN THE STUDENT HANDBOOK.

 

Final grade will be based on five areas:

Final Test...........……….......10%

Quiz scores..............…...…..25%

Lab Work Performance .......45%

Lab Log………………….…..10%

Employee Characteristics….10%

 

Final Grading Scale:

A > 90 - 100%

B > 80 - 89%

C > 70 - 79%

D > 60 - 69%

F > 59% or below

 

FINAL TEST: All students are required to take the comprehensive final test.

No unit tests will be given in this course.

 

Quizzes: A quiz may be given every other day. A missed quiz cannot be made up. Each student may be required to write 5 quiz questions as part of their quiz score. These are due before the quiz and will not be accepted late. The lowest quiz score will be dropped.

 

LAB WORK PERFORMANCE: Work performance will be evaluated based on weekly lab worksheets. Worksheets will be collected weekly as the work is completed. All worksheets must be turned in by Wednesday, March 17th.

 

LAB LOGS: A weekly lab log will be kept by each student.  The student will record his/her lab activity for the week.  A weekly grade will be determined from the students log.  The log must be turned in two school days after the last lab period for the week.  A log not turned in on time will result in a zero for the weekly lab grade.

The log entry must include the following: Name, Day & Date, Description of the lab activity for each day (minimum of five sentences), Five things learned that week, Difficulties experienced that week and Description of the best part of the lab activity for the week.

 

EMPLOYEE CHARACTERISTICS: Students will receive a weekly grade based on their demonstration of basic employee characteristics expected by employers. These include Dependability, Punctuality, Teamwork, Communication, Safety, and Cleanup. The instructor will rate each characteristic weekly on a scale

of 0 to 4:         0 - Unacceptable

                        1 - Occasionally meets minimum requirements

                        2 - Consistently meets minimum requirements

                        3 - Occasionally exceeds minimum requirements

                        4 - Consistently exceeds minimum requirements

 

 

COURSE COMPETENCIES/OUTCOMES:

Upon the completion of this course the student be able to;

 

·        Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, and calibration decals). P-1

·        Diagnose fluid usage, level, and condition concerns; determine necessary action. P-1

·        Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles. P-1

·        Inspect, adjust or replace throttle valve (TV) linkages or cables; manual shift linkages or cables; transmission range sensor; check gear select indicator (as applicable). P-1

·        Service transmission; perform visual inspection; replace fluids and filters. P-1

·        Inspect, adjust or replace (as applicable) vacuum modulator; inspect and repair or replace lines and hoses. P-3

·        Inspect, repair, and replace governor assembly. P-3

·        Inspect and replace external seals and gaskets. P-2

·        Inspect extension housing, bushings and seals; perform necessary action. P-3

·        Inspect, leak test, flush, and replace cooler, lines, and fittings. P-2

·        Inspect and replace speedometer drive gear, driven gear, vehicle speed sensor (VSS), and retainers.   P-2

·        Inspect, replace, and align powertrain mounts. P-2

·        Remove and reinstall transmission and torque converter (rear-wheel drive). P-2

·        Remove and reinstall transaxle and torque converter assembly. P-1

·        Disassemble, clean, and inspect transmission/transaxle. P-1

·        Inspect, measure, clean, and replace valve body (includes surfaces and bores, springs, valves, sleeves, retainers, brackets, check-balls, screens, spacers, and gaskets). P-2

·        Inspect servo bore, piston, seals, pin, spring, and retainers; determine necessary action. P-3

·        Inspect accumulator bore, piston, seals, spring, and retainer; determine necessary action. P-3

·        Assemble transmission/transaxle. P-1

·        Inspect converter flex plate, attaching parts, pilot, pump drive, and seal areas. P-2

·        Measure torque converter endplay and check for interference; check stator clutch. P-2

·        Inspect, measure, and reseal oil pump assembly and components. P-1

·        Measure endplay or preload; determine necessary action. P-1

·        Inspect, measure, and replace thrust washers and bearings. P-2

·        Inspect oil delivery seal rings, ring grooves, and sealing surface areas. P-2

·        Inspect bushings; determine necessary action. P-2

·        Inspect and measure planetary gear assembly (includes sun, ring gear, thrust washers, planetary gears, and carrier assembly); determine necessary action.  P-2

·        Inspect case bores, passages, bushings, vents, and mating surfaces; determine necessary action.    P-2

·        Inspect and reinstall parking pawl, shaft, spring, and retainer; determine necessary action. P-3

·        Inspect clutch drum, piston, check-balls, springs, retainers, seals, and friction and pressure plates; determine necessary action. P-2

·        Measure clutch pack clearance; determine necessary action. P-1

·        Air test operation of clutch and servo assemblies. P-1

·        Inspect roller and sprag clutch, races, rollers, sprags, springs, cages, and retainers; replace as needed. P-1

·        Inspect bands and drums; determine necessary action. P-2

 

            Note: P-1, P-2 & P-3 indicate the NATEF task priority level.

 

 

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AT131 Automatic Transmission I

Approximate Lesson Sequence

Reading Assignment Topics

 

Week              Discussion Topic                                                      Chapter; page

1          Into to Automatic Transmissions & Transaxles                  1; 1-30

2          Planetary Gear Operation And Power Flow                                  3; 51-96

3          Hydraulic Fundamentals                                                                   4; 97-121

4          Pumps & Control Devices                                                               5; 129-133,   

                                                                                                                            138-158    

            Apply Devices                                                                                   2; 31-50

                                   

5          Fluid Couplings & Torque Converters                                            7; 187-200

                                                                                                                        5:133-137

6          Transmission Fluids                                                             4; 123-128

7          Filters and Coolers                                                                           5; 137-138

8          FINAL EXAMS

 

 

AT131 Automatic Transmission I

Lab Assignments

q      RWD removal & installation

q      FWD removal and installation

q      Transmission fluid, filter change and band adjustment

q      RWD disassembly and reassembly

q      Shift linkage inspection and adjustment

q      Throttle valve linkage inspection and adjustment

q      Speedometer gear removal and installation

q      Governor removal, inspection and installation

q      Valve body and servo removal, inspection and installation

q      Transmission mount removal & installation

q      Vacuum modulator removal, inspection and installation

 

 

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Automatic Transmissions I

Lesson 1

Intro. To Transmissions and Transaxles

 

What components make up the vehicles drivetrain?

 

 

 

 

How does the engine create torque?

 

 

 

 

What is the function of the transmission?

 

 

 

 

What does the differential do?

 

 

 

 

What is the purpose of constant velocity joints?

 

 

 

What is torque?

 

 

 

What pushes the car forward?

 

 

Gear Train Theory

 

 

Underdrive –  torque multiplication and speed reduction

 

 

Overdrive – torque reduction and speed multiplication

 

 

Gear ratio –  factor of torque multiplication and speed reduction

 

 

Gear Ratio = Driven Gear Teeth

                      Drive Gear Teeth

 

Gear Ratio of multiple gear sets

 

Ratio of first x ratio of second

 

Final drive ratio = Transmission ratio x differential ratio

 

How does the final drive ratio affect vehicle acceleration and speed?

 

Engine torque = 200 ft-lbs.

Engine speed = 1800 rpm

Tire size = 36 in.

Differential ratio = 4:1

 

First gear ratio = 3:1

Second gear ratio = 1.5:1

Third gear ratio = 1:1

 

 

 

Automatic Transmission Basics

 

Transmission Gear Ranges

 

        Park – Neutral gear, output shaft locked by a parking pawl.

 

        Reverse – ratio about 1.8:1

       

        Neutral – neutral gear

 

        Overdrive – normal forward gear ranges, automatic shifting through all forward gears

 

        Drive – normal shifting without overdrive

 

                        See shift schedule – p. 270

       

        Manual Second – second only or 1-2 shift, used for engine braking

 

        Manual low – first gear only at start-up, may upshift to second, provides engine braking

 

                                Downshift to second if selected at high speed

 

 

 

 

 

 

 

 

 

 

 

Torque Converter

 

Fluid coupling that delivers engine power to the transmission.

 

        Components –

                Impeller or pump – connected to engine crankshaft

 

                Turbine – connected to transmission input shaft

               

 

                Stator – redirects flow of fluid from the turbine to the  impeller. Mounted on a one-way roller clutch.

 

        Function –

                - Automatically engage and disengage engine to transmission.

 

-         Absorb shock while changing gears

 

-         Multiples torque under load

 

 

Planetary gear set

 

        Compoments –

 

-         Sun gear

-         Planetary pinion gears and carrier

-         Internal ring gear

 

 

http://auto.howstuffworks.com/automatic-transmission2.htm

 

 

 

Function –

 

-         Provide underdrive, overdrive, direct drive and reverse   in one gear unit.

-         When one member is held torque and/ or direction is affected.

-         When two members are held direct drive is achieved.

 

 

What is the purpose of transmission fluid?

 

-         lubricate

-         cool

-         apply hydraulic force

-         transfer torque

 

 

Transmission Controls

 

Hydraulic – transmission fluid is controlled to apply a force which controls the action of the planetary gear set

 

Valves –

-         pressure regulating – controls transmission pressures

-         flow directing – feed pressure to the correct apply device (clutch, servo)

-         shift-point control – work together to determine shift- points

 

Electronic – TCM controls solenoids and force motors which affect the ATF flow to achieve better shift quality

 

 

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Automatic Transmissions I

Lesson 2

Planetary Gear Sets And Power Flow

 

Panetary gear set types

       

-         Simple

-         Simpson

-         Ravigneaux

 

        Simple –   One sun, one carrier, one ring gear: can provide underdrive (reduction), overdrive, direct drive, reverse or neutral.

                        See page 53.

 

Action

Ratio

Input

Held (reaction)

Output

U.D.

3.33:1

Sun

Ring

Carrier

U.D.

1.43:1

Ring

Sun

Carrier

O.D.

0.33:1

Carrier

Ring

Sun

O.D.

0.7:1

Carrier

Sun

Ring

R.-U.D.

2.33:1

Sun

Carrier

Ring

R.-O.D.

0.43:1

Ring

Carrier

Sun

Direct

1:1

Any two members locked together, no reaction

Neutral

NA

No member held

 

                       

        Simpson Gear Train

 

-         Two planetary gear sets with a common sun gear;

     consists of one sun, two planet carriers and two

     ring gears

-         Provides first and  second underdrive, direct drive

     and reverse.

 

Simpson Gear Train Ratios

Gear range

Ratio

Input

Held (reaction)

Output

First 

2.7:1

Front ring

Front carrier

Sun

 

 

Sun

Rear carrier

Rear ring

Second 

1.5:1

Front ring

Sun

Front carrier

Third

1:1

Front ring and sun

None

Front carrier

Reverse

1.9:1

Sun

Rear carrier

 Rear ring

 

 

Ravigneaux Gear Train

 

-         Provides underdrive, overdrive, direct and reverse

-         More compact than the Simpson gear train

-         Capable of more torque transfer

-         Three output members

 

Components

 

-         Large sun gear

-         Small  sun gear

-         Long pinion – engaged to large sun gear, short pinion and ring gear

-         Short pinion – engaged to small sun gear and long pinion

-         Planet carrier – holds both sets of pinions

-         Ring gear

 

 

 

http://auto.howstuffworks.com/automatic-transmission3.htm

 

 

          Ravigneaux Gear Ratios

Gear range

Ratio

Input

Held (reaction)

Output

Idler

Free

First 

2.4:1

Small sun