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4th year HET > Driveline fundamentals and service > Flashcards

Driveline fundamentals and service Flashcards

1
Q

what is a drive train

A

the entire arrangement of various major components and connecting drivelines

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2
Q

what is the basic function of a driveline

A

to transmit power from the drive unit to the driven unit

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3
Q

when are single drivelines used

A

if the operating distance between a drive and driven unit is within allowable limits

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4
Q

what determines the limit of the driveline length

A

shaft torque loads - shaft speeds and diameter of the tube

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5
Q

when are multiple drivelines used

A

when using a tandem rear axle

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6
Q

what is a midship bearing

A

a support bearing for a long driveline used to carry the weight of the first shaft and secure its position in relation to the second shaft

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7
Q

driveline construction is usually made up of several different components that must be

A

welded together and balanced

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8
Q

what might be the cause of a slightly bent or twisted driveline tube

A

vibration

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9
Q

what is the purpose of U-joints

A

they allow the transmission of power from one major component to another

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10
Q

what should be remembered when installing the u-joints

A

the grease fitting is installed so it wont interfere with other components and is easily able to be greased

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11
Q

what is a trunnion

A

a highly polished bearing surface at the end of each universal joint cross arm

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12
Q

what is in each bearing cap that fits over the trunnion

A

needle bearings

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13
Q

when installed in the yoke the universal joint bearing cap and trunnion bearing cap allows for

A

a certain amount of pivoting action to occur

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14
Q

yokes are

A

the devices used to make connections to universal joints

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15
Q

what type of yoke would allow the shaft assembly to change in length

A

slip yoke or (sleeve )

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16
Q

what will regular lubrication help provide on a slip yoke

A

control load stress on the splines and enables the splines to smoothly slide together during operation

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17
Q

what is another name for a mid-ship bearing

A

a steady bearing

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18
Q

the center support bearing is

A

a sealed bearing and cannot be lubricated

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19
Q

why should you never wash an old center support bearing with solvents

A

because this would remove the grease from the bearing making it unserviceable

20
Q

what is one way to protect an old center support bearing

A

packing water resistant grease around the outside of the bearing on both sides

21
Q

what is the maximum working angle difference allowable on a parallel drive shaft design

A

1 degree

22
Q

what is a broken back driveline

A

when the major components are to close for a parallel design . so the center line of the drive input and output intersect when extended toward each other over the middle of the driveline

23
Q

what is the purpose of the retaining clips or wire on the bearing caps

A

to prevent them falling off and losing the needle bearings during removal or installation

24
Q

when inspecting the universal joint what damage would you be looking for

A

pitting - end galling - brinelling - spalling

25
Q

what may be caused by heavy work loads resulting in a breakdown of the bearing surface

A

spalling

26
Q

what might be caused by lack of lubrication or incorrect working angle

A

end galling

27
Q

what would having zero working angle or lack of lubrication cause

A

false brinelling

28
Q

what would contaminated lubricant cause

A

pitting

29
Q

how can you make sure the bearing end cap is fully seated after installation

A

tap with a soft face hammer then gently tighten bearing cup retaining screws - loosen screws and retorque to spec

30
Q

why is it important to phase a driveline

A

to ensure the two universal joints on each driveline assembly are correctly aligned with each other

31
Q

how can working angle be measured

A

with a bubble gauge or inclinometer

32
Q

when using a inclinometer it must have

A

a degree scale that is accurate within 1/4 degree

33
Q

when using a bubble gauge to measure phase make sure to

A

always face it in the same direction when reading it . turning it could introduce an error into your measurements

34
Q

if the driveline is in phase but still out of balance what might be the problem

A

the slip joint was installed 180 degrees out of alignment

35
Q

when measuring working angle and the driveline is sloped up this would be considered a

A

negative degree reading

36
Q

when measuring working angle and the driveline is sloped down this would be considered a

A

positive degree reading

37
Q

if a driveline shaft is level when measuring working angle it is considered a

A

zero degree working angle

38
Q

when measuring working angle and both shafts have a positive or negative working angle then in order to find the total working angle of both shafts you must

A

subtract your readings - ( if one was 5 and the other was 3 then 5 - 3 = 2 degrees working angle )

39
Q

when measuring the working angles and one side has a negative and the other has a positive then in order to find the total working angle you must

A

add or readings - ( if one was 2 degrees negative and the other was 1 degree positive then 2 + 1 = 3 the total would be 3 degrees

40
Q

when calculating universal joint working angles you must only work with

A

one driveline at a time

41
Q

what is a single plane working angle

A

when the universal joints will have a working angle in either the horizontal or vertical plane but not both

42
Q

what is a compound working angle

A

when the driveline can be viewed from the top or the side and happens when the transmission and differential are not aligned on both the horizontal and vertical plane

43
Q

universal joint angles must be equal to each other but they must also

A

be correct for the speed they will encounter

44
Q

in order to determine if a vibration is coming from the engine or in the drivetrain you could preform a

A

stationary test

45
Q

what would low speed vibration most likely be

A

wheel/tire or wheel bearing because they turn at about 1/4 speed as the driveshaft

46
Q

at higher speeds a higher pitched sound and vibration will be in a driveshaft how is this confirmed

A

run the unit up through the vibration then let it coast down through the vibration if the noise and vibration are present during the increase and decrease in speed the problem is the driveshaft

4th year HET (31 decks)

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