Four-Wheel-Drive Systems Fill-in-the-Blank Questions

Some vehicles use a planetary gear set to couple the front and rear axles. This gear set functions as a _____.

differential

An IFS 4WD axle has the _____ housing mounted solidly to the vehicle's frame and uses short _____ to connect the differential to the wheels.

differential, drive shafts

occurs when the drive axles are rotating at different speeds on dry pavements or when the vehicle is turning a corner.

driveline wind-up

Common ways of connecting and disconnecting the front axles on a 4WD vehicle include having locking hubs, _____ motors, _____ motors, and mechanical _____.

electric, vacuum, linkage

A typical car has _____ wheels, _____ of which can deliver power; therefore, they could be designated as 4X2 vehicles. A 4WD vehicle is designated as a 4X4 because it has _____ wheels and power can be applied to all _____ wheels.

four, two, four, four

To provide for _____ suspension, some vehicles have one half shaft and one solid axle for the front drive axle.

independent front

are not used on full-time 4WD systems because the axles and hubs are always driven by the transfer case.

locking hubs

In a typical planetary gear set, speed reduction is provided when the _____ gear is held stationary.

ring

A simple planetary gear set is made up of three gears. In the center of the gear set is the _____ gear. Meshing with this gear are three or four _____ gears. These are held together by the _____. This holds the gears in place while allowing them to rotate around their shafts. On the outside of the planetary gear set is the _____ gear. This gear has teeth around its inside circumference.

sun, pinion, planetary carrier, ring

Two-speed transfer cases typically have four positions: _____, which engages only the rear axle and is used for all dry-road driving; _____, which engages both axles and is used at any speed on slippery surfaces; _____, which disengages both axles; and _____, which engages both axles and lowers the ratios of the entire driveline, and should only be used at low speeds and on very demanding terrain.

two-wheel drive high, four-wheel drive high, neutral, four-wheel drive low