Manual Transmission Systems - Front Engine Front Wheel Drive

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Questions and Answers

What is the primary difference between a front engine front wheel drive transmission and a front engine rear wheel drive transmission?

The number of shafts

The location of the final drive/differential assembly (correct)

The type of clutch used

The type of gear ratios used

What is the term often used to refer to a front engine front wheel drive transmission?

Final drive transmission

Transaxle (correct)

Front wheel drive transmission

Transverse gearbox

How are some assemblies mounted onto the gearbox shafts?

By being cast directly onto the shaft (correct)

Through the use of synchromesh

By being bolted onto the shaft

Through the use of needle roller bearings

What is the purpose of the output shaft in a front engine front wheel drive transmission?

To mesh directly with the final drive/differential ring gear Signup and view all the answers

In which module can you find more information on propshafts?

LV12 - Drive Shafts Signup and view all the answers

What is the mounting orientation of the transmission in a front engine front wheel drive vehicle?

Transversely Signup and view all the answers

In a front engine front wheel drive transaxle, which gear is typically associated with the sliding mesh?

Reverse gear Signup and view all the answers

What is the purpose of synchromesh mechanisms in manual transmission systems?

To synchronize gear rotation Signup and view all the answers

In a torque flow diagram, what is the primary input component?

Input shaft Signup and view all the answers

What is the primary function of the clutch in a manual transmission system?

To disconnect the engine from the transaxle Signup and view all the answers

In a transaxle design, what is the purpose of the ring gear?

To transmit power to the wheels Signup and view all the answers

What is the typical gear selection sequence in a manual transmission system?

1st, 2nd, 3rd, 4th, 5th Signup and view all the answers

What is the purpose of synchroniser assemblies in a front engine rear wheel drive transmission?

To prevent gear crunching by synchronising gear speeds Signup and view all the answers

What is unique about the reverse idler gear in a front engine rear wheel drive transmission?

It does not use synchromesh Signup and view all the answers

What is the purpose of snap rings and spacers in a front engine rear wheel drive transmission?

To keep assemblies in lateral alignment Signup and view all the answers

What do the gears (except the reverse idler gear) remain in with each other in a front engine rear wheel drive transmission?

Constant mesh Signup and view all the answers

What is the effect of locking individual gears to the shafts in a front engine rear wheel drive transmission?

Gear selection Signup and view all the answers

What is the purpose of the clutch in a front engine rear wheel drive transmission?

To disconnect the engine from the transmission Signup and view all the answers

Study Notes

Front Engine Front Wheel Drive vs. Rear Wheel Drive

Front engine front wheel drive (FFWD) transmissions are typically known as transaxles.
FFWD transmissions have the gearbox and differential integrated into a single unit.
FFWD transmissions have a transverse mounting orientation, with the output shaft pointing towards the side of the vehicle.
FFWD transmissions often use a sliding mesh gear for the reverse gear selection.
FFWD transmissions use an output shaft to transmit power directly to the front wheels.
Rear engine rear wheel drive (FRWD) transmissions have separate gearbox and differential units.
FRWD transmissions have a longitudinal mounting orientation, with the output shaft pointing towards the rear of the vehicle.
FRWD transmissions use a propshaft (driveshaft) to transmit power from the gearbox to the differential.
FRWD transmissions use synchroniser assemblies to facilitate smooth gear changes.
FRWD transmissions utilize snap rings and spacers for precise gear positioning and shaft assembly.
FRWD transmissions typically have a reverse idler gear which rotates in the opposite direction to the main shaft.

Transmission Components and Functions

Synchromesh mechanisms allow for smooth gear changes by synchronizing the speeds of the gears before engagement.
Output shaft transmits power from the gearbox to the differential or directly to the wheels.
Clutch disconnects engine power from the transmission, allowing for gear changes and vehicle start/stop.
Ring gear in a transaxle is part of the differential and is responsible for power distribution to the wheels.
Clutch in a FRWD transmission disconnects engine power from the gearbox.
Reverse idler gear in a FRWD transmission is used to change the direction of rotation for reverse gear operation.
Gear selection sequence in a manual transmission follows a specific pattern for engaging different gears.
Prop shafts are covered in a dedicated module and are used in FRWD transmissions to transfer power to the rear axle.

Assembly and Arrangement

Gearbox shafts are often fitted with bearing assemblies, seals, and other components that allow for smooth rotation and prevent leakage.
Gears in a FRWD transmission (excluding the reverse idler gear) are typically locked to the shafts for power transmission.
Gears in a FRWD transmission can be locked individually to the shafts for specific gear ratios and operation.

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Description

Identify the major components of a manual transmission system in a front engine front wheel drive vehicle. Learn about the transmission case, clutch housing, input shaft, final drive/differential assembly, output shaft, and transmission case cover. Compare with front engine rear wheel drive transmissions.