This is only a part of the story. States also have as mentioned axle weight limits. So the image below shows a typical flatbed setup with max legal weight limits listed. If you add all those weights up you get 80, lbs. For example you might have 80, lbs total on your trailer like the image below, but you are over the legal limit on the drive tandem. Not to over simplify this process, but typically an item can be adjusted in the case above you might move the product toward the back of the flatbed so the weight is evenly distributed on both the drive and trailer tandem axles.
In contrast to leaf spring axles, torsion provides suspension support by the compression of the rubber cords. They are installed directly to the trailer frame by welding or bolts to create more stability. Lift axles are another type of semi-trailer axle. They are non-powered and installed ahead of or behind the driving tandem axles.
Most lift axles use airbags to carry weight and either air bags or springs are used to raise and lower the axle. Drivers easily control lift axles with electric switches or air valves. Certain large trucks and heavy haul semi-trailers have triple axle configurations.
A common configuration includes a tandem drive axle with an air-lift third axle. This third axle allows for greater axle load capacity and enables heavy trucks to drive across soft ground.
The third axle distributes the weight over a greater area and prevents the truck from sinking into the ground.
In the same way, heavy capacity semi-trailers use third axles to displace load weight across more axles. This enables the semi-trailer to comply with roadway weight restrictions. As with dump trucks, third axles in semi-trailers allow heavily-loaded trailers to successfully drive across soft ground. Although very market-specific, quad axles are another type of semi-trailer axle. They generally consist of two powered axles and two non-powered axles. Much like the triple-axle configuration, quad axles enable heavy trucks and semi-trailers to operate on soft ground without sinking or causing deep ruts.
In the case that non-powered axles are lift axles, tandem drive axles are placed in the rear while two air-lift axles are positioned ahead. If a semi-trailer is carrying a light load or no load at all, the two air-lift axles will operate in a raised position.
This lessens the effect on fuel consumption and spares tires from unnecessary drag. Certain semi-trailers such as lowboys give you the option of adding additional axles to take on more weight. These other types of trailer axles come in the form of flip axles, pin-on axles, or stingers. The flip axle is a complete axle assembly that flips up, down, or is removed depending on when it is needed.
Hinge plates and pins connect this axle to the rear of the frame. Another type of semi-trailer axle that can be added to accommodate more weight is a pin-on axle. This type of axle is attached to the rear of the semi-trailer and held in place with pins. Designed in , the stinger axle is an extendable axle that can be installed farther away from the rear drive axle.
While a conventional tag axle is mounted 52 to 60 inches behind the rear drive axle, a stinger axle is installed up to inches farther back. This extension is what allows the axle to spread a heavy load and meet federal bridge laws. Ohio also allows triple trailer 18 wheelers. Southern Hills Blvd. Call Us Chat Now. Factors in the length of time needed to stop an 18 wheeler include load weight, bobtailing and road conditions.
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