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HET4 > 401Da: Transmission Fundamentals > Flashcards

401Da: Transmission Fundamentals Flashcards

1
Q

What are the three basic functions of a transmission?

A
  • Multiply Torque
  • Reverse
  • Neutral

401Da

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2
Q

If input torque is 1000ft/lbs and gear ratio is 2:1, what is the output torque?

A

2000ft/lb

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3
Q

What is the formula to find output speed if given the input speed and gear ratio?

A

Input Speed ÷ Gear Ratio = RPM

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4
Q

What are two primary considerations when selecting a transmission for a vehicle?

A

Horsepower and torque curves

401Da

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5
Q

If a transmission has a 35% ratio step between gears, does it have a smaller or larger step between each gear as compared to a 20% ratio step?

A

Larger ratio step

401Da

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6
Q

What is another name for the transmission input shaft?

A

Clutch shaft

401Da

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7
Q

What are the other names for a transmission input shaft gear?

A
  • Transmission drive gear
  • Main drive gear

401Da

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8
Q

Is neutral a gear position?

A

No

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9
Q

How many gear ratios does a transmission usually use at the same time?

A

2 gear ratios

Except direct drive

401Da

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10
Q

What is used to control axial thrust on a transmission’s floating mainshaft gears?

A

Thrust washers with snap rings or lock pins

401Da

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11
Q

What is the purpose of synchronizers in a transmission?

A
  • Match the speed of the mainshaft gear with the mainshaft durring a shift
  • Connect the selected mainshaft gear with the mainshaft

401Da

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12
Q

What are three types of transmission synchronizers?

A

Block - Automotive use
Pin - Heavy duty use
Plate & Disc - On Mack trucks

401Da

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13
Q

How are the inserts in the block type synchronizer hub held out?

A

Spring force

401Da

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14
Q

What is the function of the insert in a block type synchronizer?

A
  • Holds shift collar in centered position
  • Allow blocker ring to line up the two gears, before joining together

401Da

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15
Q

What are the 3 stages/phases of synchronizing?

A
  1. Braking/Energizing
  2. Synchronization
  3. Engagement

401Da

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16
Q

What is used on some pin type synchronizers to provide spring-loaded resistance?

A

Split pins

401Da

17
Q

Is a shift lever generally a one or two piece design?

A

Two piece

401Da

18
Q

What is used in a shift lever to reduce transmission noise and vibration from entering the cab?

A

Isolator

401Da

19
Q

What would be the purpose of a spring-loaded plunger on the first/reverse shift block?

A

To ensure that the operator is making a conscious effort to select first or reverse.

401Da

20
Q

What is the purpose of an interlock?

A

To prevent operator from selecting more than one gear at the same time

401Da

21
Q

Where is an interlock pin located?

A

In the shift rails

401Da

22
Q

What is used in a transmission to help hold the shift rail in the selected position?

A

Detents

401Da

23
Q

What is an advantage of a multiple countershaft transmission?

A
  • Bearings can be smaller & lighter
  • Housing can be lighter

401Da

24
Q

By using a multiple countershaft transmission design, what type of gears can be used?

A
  • Spur gears can be used
  • Gears can be narrower
  • No neeed for thrust washers

401Da

25
Q

Why were remote auxiliary transmissions a bad idea when they had shift linkages?

A

Susceptible to wear and damaged from falling objects

401Da

26
Q

Why is important to drain the air tanks daily on a truck with an air shift auxiliary transmission?

A

Air Filter Regulator is susceptible to clogging from mosture and rust

401Da

27
Q

What stops oil from leaking out of the transmission at the input shaft?

A

Windback seal on the input shaft

401Da

28
Q

On a multiple countershaft transmission, all the gears are the same size on the opposite shaft, except which ones?

A

PTO gears

401Da

29
Q

Where are the timing marks usually found on multiple counter shaft transmissions?

A

On the countershaft gears

401Da

30
Q

Multiple countershaft transmissions can use several housings. How are these housings kept in allignment?

a) shoulder bolts
b) precise doweling
c) tapered plugs
d) floating cap screws

A

b) precise dowelling

401Da

31
Q

The shift lever direclty moves the _______ in the shift bar housing.

a) shift fork
b) shift rail
c) sliding clutch
d) air valve shaft

A

b) shift rail

401Da

32
Q

In a 5 speed overdrive transmission, what gear would be direct?

a) first
b) reverse
c) fourth
d) fifth

A

c) fourth

401Da

HET4 (44 decks)

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