Driveline Fundamentals Flashcards
Drivelines
Are the shafts and joints used to connect various major components together.
Single driveline
When a single shaft is used with no centre bearing (bus)
Multiple drivelines
When multiple shafts are used with no centre bearing (day cab, tandem)
Multiple shaft driveline
When multiple shafts are used together with centre bearing(s).
Driveline Tube
Tube welded between two end pieces, can have cork type material inside to absorb shocks
Universal joint
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
Trunnion
A highly polished bearing surface, is located at the end of each U joint cross arm
Yokes
Are devices used to make connections to U joints
What are the different types of tube yolks (3)
Half round
Full round
Wing
Stub shaft
An externally splined shaft welded to the tube, mates with the slip yolk
Slip yolk
When yolk is apart of short, internally splined stub tube
Centre support bearing
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
What is a primary coupling shaft?
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)
Parallel shaft arrangement
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 _____
Intersecting angle type driveline
When components shaft lines extended toward each other and intersect over the middle of the driveline.
What is the allowable difference in U joint working angles for a shaft
Should be equal, but 1 degree of difference is allowable
What are 3 functions of a driveline assembly?
Provides a means of transmitting power
Allows angle changes to occur in the path of power
Allows length changes to occur in the driveline
When 2 driveline assemblies are used on a vehicle with a long wheelbase, what type of bearing must also be used?
Centre support bearing, also called midship bearing
How can a multiple shaft driveline arrangement can work without using a centre bearing?
Tandem rear axle or AUX trans, reducing distance between major components to only need one shaft in each place
What safety precaution should be taken when stationary engines are using any sort of driveline to transmit power to a device?
Use suitable guards around the driveline components, do not work on moving components
What common types of damage can be sustained by a driveline tube? (4)
Bends (due to impact)
Twists (Overloading and shock loads)
Impact with objects
Contact with the terrain
What checks should be done to a repaired driveline assembly before installation
Length is same
Runout checks (compare to spec)
Balance of assembly
