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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
Why were remote auxiliary transmissions a bad idea when they had shift linkages?
Susceptible to wear and damaged from falling objects ## Footnote 401Da
26
Why is important to drain the air tanks daily on a truck with an air shift auxiliary transmission?
Air Filter Regulator is susceptible to clogging from mosture and rust ## Footnote 401Da
27
What stops oil from leaking out of the transmission at the input shaft?
Windback seal on the input shaft ## Footnote 401Da
28
On a multiple countershaft transmission, all the gears are the same size on the opposite shaft, except which ones?
PTO gears ## Footnote 401Da
29
Where are the timing marks usually found on multiple counter shaft transmissions?
On the countershaft gears ## Footnote 401Da
30
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
b) precise dowelling ## Footnote 401Da
31
The shift lever direclty moves the _______ in the shift bar housing. a) shift fork b) shift rail c) sliding clutch d) air valve shaft
b) shift rail ## Footnote 401Da
32
In a 5 speed overdrive transmission, what gear would be direct? a) first b) reverse c) fourth d) fifth
c) fourth ## Footnote 401Da

HET4 (39 decks)

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