Manual Transmissions & Transaxles Flashcards
What is the purpose of the transmission?
Multiply engine torque, Lower engine RPM (O/D) and allow change in direction (R)
What is gear pitch?
the number of teeth per given unit of pitch diameter
What is pitch diameter?
distance from the halfway point of 2 furthest apart gear teeth
What is Pitch Circle?
the halfway point of the gear teeth
Where is the Face on a gear?
above the pitch circle (tooth center line)
Where is the Flank on a gear?
below the pitch circle (tooth center line)
What is direct drive?
same size gears
What is underdrive?
a larger drive gear (more torque)
What is overdrive?
a smaller drive gear (more speed)
list the parts and describe the ‘exploded view’ of a synchronizer
A center hub surrounded by 3 [inserts/shifting keys]. These are held together by a [sleeve] and secured with [lock rings/key springs] on either side. This whole assembly is sandwiched between 2 [blocking inserts] making up the entire [Synchronizer]
Describe the flow of power on a Transmission
Power flow enters from the [Input shaft] and then is transferred through the [Clutch gear] to a lower [Countershaft]. Then through the selected [Speed gear] and back up to exit out the [Output shaft].
Only exception is 4th gear where its transferred directly from the [Input shaft] to the [Output Shaft]
Describe the flow of power on a Transaxle
Power flow enters from the [Primary Shaft] and then is transferred through selected [Speed Gear] down to the [Secondary Shaft] and out the [Ring Gear]
What does the shifting interlock feature do?
Prevents engaging 2 gears at once
What do the detents balls and springs do?
Prevents gear from ‘popping out’
What benefit does a Transaxle have over a Transmission?
Its more compact and eliminates the need for high speed drivelines
