Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

HET Third Year Powertrain SAIT > 190303jA > Flashcards

190303jA Flashcards

Drive Axle and Carrier Fundamentals and Service- Part A

1
Q

What is sprung vs unsprung weight?

A

sprung weight: anything supported by suspension
unsprung weight: anything not supposed by suspension

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

an off road assembly must withstand and support the weight of the equipment and load that has been passed through the suspension system to drive axle assemblies
T or F

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

off road equipment must be able to handle the loads and stresses applied by _____________ and the extreme applications the machines are designed for

A

working conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

the rear axle assembly must be able to withstand the forces applied while the box is _______

A

raised

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

the drive axle changes the direction of power flow by how many degrees?

A

90 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what provides the final gear reduction in the powertrain?

A

the drive axle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what does GAWR stand for?

A

gross axle weight rating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the GAWR?

A

manufacturer says how much an axle can safely carry

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

gross axle weight refers to the weight the axle must be able to carry. what does it not refer to?

A

the weight it must propel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what determines the construction of the housings, bearings, axles, and wheel ends?

A

the gross axle weight rating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what torque ratio does the drive axle provide?

A

reduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

how does the drive axle change the path of power to 90 degrees?

A

with bevel gears

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is the path of power in a single reduction drive axle diff?

A

input pinion
crown (bevel) gear
diff case halves
cross shaft (spider)
diff pinion gear (spider gears)
axle side gears
axle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is the math equation to find bevel rpm?

A

left rpm + right rpm / 2= bevel rpm
you won’t lose speed in a differential

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

if the machine travelled in a straight line, there would be no need for a speed difference between the?

A

wheel ends

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ways traction control can be activated?

A

by operator manually
automatic differential
limited slip differential

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what do the automatic/limited slip differentials allow the diff to do?

A

auto lock when traction is bad on one side of the machine, but allows diff to work normal while cornering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Function of the carrier housing (differential case)?

A

hold the internal gear components (pinion, bevel, diff case, diff assembly)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

carrier must be able to handle?

A

all torque created through the engine and powertrain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

why does the carrier have 2 removable caps at the rear?

A

to secure diff case bearings and adjusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

where is the differential carrier located?

A

in rear axle housing behind tranny

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what does the differential thrust pin do?

A

prevent diff movement during high thrust loads

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what type of equipment runs an integral input pinion?

A

smaller equipment, limits torque applied to carrier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what type of equipment runs a carrier mounted pinion?

A

large equipment, need breakout torque forces. torque multiplies through differentials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Characteristics of a full floating axle shaft?

A

only transmits torque, does not carry machine weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

what is the main function of a full floating axle shaft?

A

drive the final drive and hub assembly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

on a full floating axle, how is the weight and load transmitted?

A

through the drive axle housing, bearing arrangement, hub assembly, wheels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

benefit of a full floating axle while disassembling?

A

can remove the axle while keeping the vehicle weight on the tires

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

characteristics of a semi floating axle shaft?

A

transmits torque and carries weight of machine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what is the common arrangement for planetary final drives?

A

inout on sun, output on carrier, ring held, carrier turns sun, carrier output, ring held

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

what can a machine produce while using double reductions?

A

great amounts of breakout torque, axle component stress minimal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

what axle design is the only application that can handle extreme forces created at the wheel end?

A

full floating axle design

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

what is the drive axle housing made form?

A

cast steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

what does the axle housing provide?

A

frame for mounting carrier assembly and attached components

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

what is the opening called in the middle of the drive axle housing?

A

the bowl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

what is the carrier housing made from

A

cast steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

what is the main function of the carrier housing?

A

hold internal gear components

38
Q

the carrier must be sturdy enough to support components and withstand what forces?

A

forces trying to separate the gears

39
Q

what does th opinion bearing cage house?

A

bearings that support the pinion

40
Q

why are tapered roller bearings on the pinion put under preload?

A

to keep pinion located properly, ensure bearings rotate while under torque

41
Q

what determines bearing preload?

A

selective spacer, designated thickness

42
Q

how can you adjust pinion depth?

A

with shims between pinion bearing cage and carrier housing

43
Q

what prevents lube from escaping?

A

input pinion seal

44
Q

what provides the final gear reduction in the powertrain?

A

the pinion and bevel gear

45
Q

what does an overhung pinion look like?

A

has a flat surface at the end of the pinion gear

46
Q

where does the pinion sit in an abmoid pinion position?

A

above centreline

47
Q

what is the better pinion mount, overhung or straddle?

A

straddle is stronger than overhung

48
Q

what does a straddle mount pinion look like?

A

short stub shaft extends past the end of the pinion gear. has a bearing at the end

49
Q

what design of pinion mount is better for high torque loads?

A

straddle mount

50
Q

what does the stub shaft prevent the pinion from doing?

A

deflect away from bevel gear in high torque situations

51
Q

where does a hypoid pinion set in relation to the centreline?

A

below the centreline

52
Q

where does the spiral bevel pinion sit in relation to the centreline?

A

at the centreline

53
Q

where does the bevel gear bolt to?

A

the differential case, diff case rotate when bevel gear rotates

54
Q

what drive assembly does the drive pinion and bevel gear set act as?

A

an angle drive assembly

55
Q

according to the book, can you swap out the drive pinion or bevel gear individually?

A

no, must be used in matched sets

56
Q

where is the gear ratio stated on a pinion?

A

at the threaded end of the pinion, opposite the gear end

57
Q

where is the pinion position number found on a pinion?

A

on the stub shaft/ at the head of the gear on the pinion

58
Q

what does 39-6 mean on a gear?

A

the gear ratio, 39/6

59
Q

what is used to prevent the bevel gear from deflecting away from the pinion in high torque load?

A

a thrust screw

60
Q

where does the thrust screw sit and why does it sit there?

A

exactly opposite the pinion gear, on back side of bevel gear. sits bc that’s where max thrust load and deflection is

61
Q

what’s another name for the differential cross shaft?

A

spider

62
Q

what is the last component that makes up the diff case assembly?

A

the axle side gears

63
Q

in a differential what gears can rotate at a different speed than the case?

A

the axle side gears

64
Q

what are the 2 functions of a differential assembly?

A

split torque evenly to each shaft
deliver torque while allowing for difference in wheel speed side to side

65
Q

what does the differential assembly act like?

A

a torque divider

66
Q

torque is a function of resistance to?

A

movement

67
Q

since the differential delivers the same amount of torque to each axle, the wheel that has good traction will only receive the amount of torque required to rotate the wheel with poor traction, because it goes off of resistance and it will take the path of least resistance

A

there is no answer that’s just good info

68
Q

can speed or RPM of the axles be lost?

A

no, what comes in goes out. or is transferred to other side

69
Q

while travelling straight ahead over even terriain, what is the differential gears doing?

A

all turning together

70
Q

what happens to the wheels when you make a turn?

A

outer wheel goes faster than inner wheel, needs to travel a farther distance

71
Q

when travelling in a straight line with uneven tire size or uneven terrain, what will happen?

A

diff gears will act like machine is cornering as one side will have to make up for the other side

72
Q

when can extreme speed differences occur in a differential?

A

with really bad traction

73
Q

how many differentials would a single motor scraper and single axle haul truck have?

A

one differential

74
Q

what does a transfer case do?

A

drop flow of power down form tranny and then divide the power between the front and rear shafts

75
Q

what does a transfer gear do?

A

split power to each axle group

76
Q

how is a range shift collar actuated?

A

air pressure and solenoid valves

77
Q

what does an interaxle differential help with?

A

splitting torque equally between front and rear drive shafts

78
Q

how can you eliminate differential action to ensure both axles rotate at the same speed?

A

by locking the differential carrier to one axle side gear

79
Q

what style of traction control provides more torque to the wheel with the greatest traction?

A

limited slip and no-spin

80
Q

what traction controls don’t lock the carrier and axle to the extent that the locking differential does?

A

limited slip and no spin

81
Q

what is a disadvantage of a locking differential?

A

shitty cornering

82
Q

what are 2 types of diff locks?

A

jaw (dog) clutch
disc/plate clutch

83
Q

how does a jaw style clutch work?

A

shift collar moves up and down with air, locks together to eliminate diff action

84
Q

how can you limit damage when using a dog clutch?

A

operator low engine speed, travel straight ahead, don’t engage it when moving

85
Q

on a plate and disc clutch diff lock, what is the normal position?

A

clutch released, oil applied spring released

86
Q

what does a limited slip differential provide?

A

equal power and torque rot both shafts in normal conditions

87
Q

if one wheel loses traction in a limited slip diff, where does the torque go?

A

to the wheel with more traction

88
Q

how does the no-spin differential operate?

A

normally engaged and drives both wheels at same speed all the time, but when cornering it will unlock and allow that wheel to go faster

89
Q

the bevel gear is bolted directly to the:

A

flanged case half

90
Q

the differential pinions are driven by the:

A

cross shafts

91
Q

the most common differential carrier assembly used today is the

A

single speed single reduction

HET Third Year Powertrain SAIT (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions