Driveline Fundamentals

Question 1

Drivelines

Answer 1

Are the shafts and joints used to connect various major components together.

Question 2

Single driveline

Answer 2

When a single shaft is used with no centre bearing (bus)

Question 3

Multiple drivelines

Answer 3

When multiple shafts are used with no centre bearing (day cab, tandem)

Question 4

Multiple shaft driveline

Answer 4

When multiple shafts are used together with centre bearing(s).

Question 5

Driveline Tube

Answer 5

Tube welded between two end pieces, can have cork type material inside to absorb shocks

Question 6

Universal joint

Answer 6

Are coupling device. Allow the transmission of power from one major component to another (EX. trans to Diff)
Are cross-shaped and have drilled passages for lube purposes

Question 7

Trunnion

Answer 7

A highly polished bearing surface, is located at the end of each U joint cross arm

Question 8

Yokes

Answer 8

Are devices used to make connections to U joints

Question 9

What are the different types of tube yolks (3)

Answer 9

Half round
Full round
Wing

Question 10

Stub shaft

Answer 10

An externally splined shaft welded to the tube, mates with the slip yolk

Question 11

Slip yolk

Answer 11

When yolk is apart of short, internally splined stub tube

Question 12

Centre support bearing

Answer 12

When multiple shafts are used together it carries the weight of the shaft connected to trans. Fits tightly on machined surface of the stub shaft

Question 13

What is a primary coupling shaft?

Answer 13

A shaft that does not act as a slip joint, it simply delivers power from the trans. to a point where the next driveline can connect with it. (2 shafts between trans. and front diff)

Question 14

Parallel shaft arrangement

Answer 14

When the drive unit output shaft and the driven unit input shaft are parallel to one another. The type of driveline used between the 2 components is _____

Question 15

Intersecting angle type driveline

Answer 15

When components shaft lines extended toward each other and intersect over the middle of the driveline.

Question 16

What is the allowable difference in U joint working angles for a shaft

Answer 16

Should be equal, but 1 degree of difference is allowable

Question 17

What are 3 functions of a driveline assembly?

Answer 17

Provides a means of transmitting power
Allows angle changes to occur in the path of power
Allows length changes to occur in the driveline

Question 18

When 2 driveline assemblies are used on a vehicle with a long wheelbase, what type of bearing must also be used?

Answer 18

Centre support bearing, also called midship bearing

Question 19

How can a multiple shaft driveline arrangement can work without using a centre bearing?

Answer 19

Tandem rear axle or AUX trans, reducing distance between major components to only need one shaft in each place

Question 20

What safety precaution should be taken when stationary engines are using any sort of driveline to transmit power to a device?

Answer 20

Use suitable guards around the driveline components, do not work on moving components

Question 21

What common types of damage can be sustained by a driveline tube? (4)

Answer 21

Bends (due to impact)
Twists (Overloading and shock loads)
Impact with objects
Contact with the terrain

Question 22

What checks should be done to a repaired driveline assembly before installation

Answer 22

Length is same
Runout checks (compare to spec)
Balance of assembly