What Is the CAD on a 4 Wheel Drive?
The CAD, short for "Center Axle Disconnect," is a mechanical system put into place on Dodge and Jeep 4x4 vehicles. These axle systems have been implemented in all newer models of their all-wheel drive vehicles, replacing older locking hub systems.
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How the CAD System Works
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The CAD system utilizes two axle shafts on the front axle of the vehicle. The left end of the axle is connected to the wheel much like a standard four-wheel drive system, while the right end is connected into the vehicle's differential as well as the wheel. The four-wheel drive engages through a vacuum motor which locks together the two components of the front-right axle while the front drive shaft begins rotating to lock its grooves into place.
Vacuum System
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The CAD system is operated by a vacuum-controlled motor, which creates pneumatic pressure to activate and deactivate the front axle. While the overall CAD and vacuum system causes less wear and tear on the mechanics of the vehicle, there are risks involved in potential damage to the vacuum motor, causing mechanical failure.
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Fuel Efficiency
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In comparison to the locking hub axle system, Center Axle Disconnect systems generate higher fuel efficiency performance than comparative non-disconnecting axle systems. Because the front axle becomes disengaged with a CAD system, less energy is required to operate the vehicle while it is in two-wheel drive. Traditional 4x4 systems constantly have the front axle engaged, and therefore uses more energy during operation.
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References
- Photo Credit pickup 4x4 car from above image by alma_sacra from Fotolia.com
