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4th year HET > Drive axle assembly fundamentals > Flashcards

Drive axle assembly fundamentals Flashcards

1
Q

what are the four functions of a drive axle assembly

A

1 - withstand and support the weight of the vehicle and load that has been passed through the suspension 2 - provides the last gear reduction in basic powertrain 3 - must change direction of torque by 90 degrees 4 - must transfer torque between the two wheels wile allowing a difference of speed between the two

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2
Q

the weight rating that refers to how much each axle can carry is called the ?

A

gross axle weight rating GAWR

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3
Q

the gross combination weight rating refers to the ?

A

the total combined gross axle weight rating for a vehicle and its trailers

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4
Q

why would a drive axle be added to the rear of a truck rather than a non driving (tag or pusher )

A

increase traction

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5
Q

the percentage of grade at which a drivetrain system can start a moving vehicle is called

A

startability

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6
Q

what components are attached to the drive axle housing

A

suspension - wheels tires and hubs - carrier housing

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7
Q

what is the main function of the carrier housing

A

hold the internal gear components

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8
Q

is the pinion bearing cage always a removable component of the carrier housing

A

false it can be a removable piece of the carrier housing or a integral component

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9
Q

how is the over hung pinion different from the straddle mount pinion design

A

the overhung pinion has a flat surface at the and of the pinion gear and the straddle mount has a short stub shaft that extends past the end of the pinion gear

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10
Q

the input drive pinion is in constant mesh with the

A

bevel gear

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11
Q

what is the main purpose of the thrust screw

A

prevents the bevel gear from deflecting away from the input pinion during heavy torque loads

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12
Q

the bevel gear is bolted directly to the

A

flanged case half

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13
Q

the differential pinions are driven by the

A

cross shafts

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14
Q

what is the most common differential carrier system used today

A

single speed reduction

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15
Q

what is the path of power in a single speed single reduction carrier assembly starting with the input shaft yoke and end with the wheel assemblies

A

input shaft yoke - input drive pinion - bevel gear - differential case - differential cross shaft - differential pinions - axle Side gears - axle shafts - wheel assemblies

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16
Q

what is the components that drives the helical drive gear on a two speed double reduction carrier assembly

A

shift collar

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17
Q

how is low gear achieved in a planetary differential carrier assembly

A

when the sun gear is locked to the retainer plate

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18
Q

the torque available to the wheel with good traction in a wheel spin condition is

A

the same as the spinning wheel

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19
Q

when a vehicle is turning a corner the differential assembly will allow

A

the outer drive wheel to rotate faster than the inner drive wheel

20
Q

where is the inter-axle differential physically located

A

in the front drive axle assembly

21
Q

what does the input shaft drive with a set of splines

A

the differential shaft

22
Q

what are the interaxle differential cross shafts driven by

A

the input shaft

23
Q

what two components are locked by the inter-axle differential lockout assembly

A

the input shaft and helical drive gear

24
Q

who is a semi floating axle removed

A

the vehicle weight must be supported and the wheels must be off the ground

25
Q

what is the input member of the planetary system on a drive axle assembly using a planetary final drive system

A

the sun gear

26
Q

what are the two main drive axle lubrication methods

A

splash lubrication and combination splash / pressure lubrication

27
Q

how are drive axles filtered

A

with spin on filters and magnetic plugs and screens

28
Q

does a differential assembly equipped with a no-spin assembly allow for normal differential action when a vehicle turns a corner ?

A

yes

29
Q

when the operator activates the driver controlled differential lock, the operator is mechanically locking what two components together

A

one axle shaft to the differential case

30
Q

as the weight of the vehicle increases what will have to bee added to stay within the weight limitations of the road

A

the number of axles will have to be increased

31
Q

what do the numbers stamped on the pinion and bevel gear relate to

A

used to calculate the reduction gear ratio of that particular gear set

32
Q

what is another name for the drive axle housing

A

banjo housing

33
Q

the construction of the axle housing directly relates to the

A

weight carrying capability of the axle

34
Q

what is the bowl of a axle housing

A

the opening with a machined mounting surface in the middle in which the carrier assembly is installed and a flange where the braking components are

35
Q

what are the two removable caps at the rear of the housing used to secure

A

the differential case bearings and adjusters

36
Q

what are the two basic drive pinions used

A

overhung mount and straddle mount

37
Q

how is the overhung mount pinion supported

A

by two tapered roller bearings

38
Q

what is the purpose of the stub shaft bearing on a straddle mount design

A

to prevent the pinion gear from deflecting away from the bevel gear during periods of heavy torque loads

39
Q

how is the straddle mount pinion design supported

A

with two tapered roller bearings on the long pinion shaft and a single roller or ball bearing on the stub shaft

40
Q

what type of pinion mount design is more suitable fore heavy torque loads

A

straddle mount design

41
Q

how is the thrust screw positioned

A

exactly opposite the pinion gear

42
Q

why is the thrust screw positioned exactly opposite the pinion gear

A

because this is the area where the maximum deflection and thrust loads will occur

43
Q

what are the two halves of the differential case

A

flanged and plain

44
Q

how are the two halves of the differential case connected and supported

A

bolted together and supported by a tapered roller bearing on either end

45
Q

what are some of the drive axle carrier assembly configurations

A

single speed single reduction
single speed double reduction
two speed double reduction
planetary two speed

46
Q

how is the driver controlled wheel lock operated

A

air applied and spring released

4th year HET (31 decks)

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