Understanding Why Some Trucks Have Tires Hanging in the Air
Have you ever noticed trucks with tires hanging in the
air, seemingly not touching the road? It's not a malfunction but a deliberate
design feature to optimize weight distribution and maneuverability.
Trucks employ extra axles that can move up and down
based on the load they carry. When fully loaded, these trucks lower the axles
to reduce pressure on the road, spreading the load over more axles and tires.
For example, concrete mixer trucks have axles that resemble trailers hanging
off the back, only lowering when loaded. Similarly, large dump trucks have
middle axles that move up and down as needed.
Moreover, some buses feature "tag" axles at
the rear, single-tire axles that pivot when making tight turns, enabling them
to navigate inner-city streets effortlessly. This rear steering, combined with
front steering, enhances maneuverability, especially in crowded areas.
Specialized trucks like fire trucks may also incorporate rear steer axles for
enhanced control.
Weight distribution is key for trucks, which is why
heavy haul trucks and trailers boast numerous axles tailored to the load.
Trailers with more than the standard two axles, seen in milk tanker trucks,
facilitate hauling extra weight efficiently. These axles remain down
consistently to support the load.
In essence, the sight of trucks with tires off the
ground signifies a sophisticated approach to optimizing weight distribution and
maneuverability, ensuring safe and efficient transportation of goods and
passengers.
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