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You see them every day on the highway. Tractor trailers, also known as semi-trailers, move a whopping 68% of goods delivered in the U.S. More than 5.6 million are registered in the U.S, and there are 3.2 million truck drivers in the U.S, who collectively drive about 140 billion miles a year to get goods to their destinations. But what do you know about the different kinds of tractor trailers? You might be surprised to find out that there are several types of tractor trailers.
Box Trucks This is the most common kind of tractor trailer. The trailer is in the shape of a wedge, meaning that it is taller in the back than in the front. These trailers come in 28-foot as well as 45-foot sizes. A 45-foot wedge has a capacity of about 3,000 cubic feet. Container Trucks These trucks carry containers that can be shipped overseas on container ships. These containers have about half the capacity of a box truck, at 1,172 cubic feet.
Refrigerated Trucks Also known as “reefer trucks,” these trucks are essentially box trucks that also have a refrigeration unit behind the cabin of the truck in order to keep the contents of the trailer cool. Flatbed Truck Flatbed trucks are used to transport things of odd or oversize dimensions that would not fit in a normal trailer. Tanker Trucks Tanker trucks carry liquids, and range in capacity from 1,000 to 9,000 gallons.
They can carry food grade and toxic grade liquids, and often require a special license to transport the latter. Evan Transportation was founded in 1992 by Jerry Wolfarth, who at the time had over 25 years of experience in the trucking and transportation industry. The initial operation consisted of a few trucks and drivers who were dedicated and professional. The goal of the company was to provide excellent, dependable service.
If you need materials and products moved in the Mid Atlantic region, contact Evan Transportation. We hire professional drivers with excellent driving records, and maintain a fleet of trailers and vehicles that are reliable and ready to roll. Contact us today for all of your freight shipment needs or call us at 443-673-3365 Before you hit the road, check us out on Facebook, Twitter, Google+, LinkedIn and YouTube! Sources http://www.
ehow.com/info_8035737_kinds-tractor-trailers.html http://www.popularmechanics.com/cars/news/pictures/10-things-you-didnt-know-about-semi-trucks#slide-10 Tags: semi trailers, tractor trailers This entry was posted on Tuesday, July 30th, 2013 at 8:39 pm and is filed under Tractor Trailers. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.
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A tractor unit pulling a semitrailer A truck pulling a semitrailer using a trailer dolly A semi-trailer is a trailer without a front axle. In the US, the term is also used to refer to the combination of a truck and a semi-trailer, a tractor-trailer. A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer.
A semi-trailer is normally equipped with landing gear (legs which can be lowered) to support it when it is uncoupled. Many semi-trailers have wheels that are capable of being totally dismounted and are also relocatable (repositionable) to better distribute load to bearing wheel weight factors. Semi-trailers are more popular for transport than full trailers, which have both front and rear axles.
Ease of backing is cited as one of the semi's chief advantages. A road tractor coupled to a semi-trailer is often called a semi-trailer truck or "semi" in North America & Australia, and an articulated lorry or "artic" in the UK. Semi-trailers with two trailer units are called B-doubles (Australian English) or tandem tractor trailers,tandem rigs, or doubles (American English). Other terms used are "B-train" or (when there are three or more trailers) "road train".
A double-trailer combination is possible with the use of a dolly, or "converter dolly" (Australian and American English), essentially one to three additional axles placed under the front of a second semi-trailer. The first semi-trailer is connected to the power unit using the tractor's fifth wheel coupling while the converter dolly, already attached to the second semi-trailer, is connected to the first semi-trailer with a drawbar.
In Australian English, the tractor unit is called a "prime-mover", and the combination of a prime-mover and trailer is known as a "semi-trailer", "semi" or single. Properties A 1920 advertisement for semi-trailers In road haulage, semi-trailers predominate over full trailers because of their flexibility. The trailers can be coupled and uncoupled quickly, allowing them to be shunted for loading and to be trunked between depots.
If a power unit fails, another tractor can replace it without disturbing the cargo. Compared with a full trailer, a semi-trailer attached to a tractor unit is easier to reverse, since it has only one turning point (the coupling), whereas a full trailer has two turning points (the coupling and the drawbar attachment). Special tractors known as shunt trucks or shuttle trucks can easily maneuver semi-trailers at a depot or loading and unloading ferries.
These tractors may lift the coupling so the trailer legs clear the ground. A rigid truck and full trailer are articulated inside the cargo area length, so a semi-trailer can have a longer continuous cargo area. Because of this, a semi-trailer can haul longer objects (logs, pipe, beams, railway track). This depends on the legislation; in some European countries, a full trailer can be as long as a semi-trailer.
However, since a rigid truck is longer than a semi-tractor, this increases the overall length of the combination, making it less maneuverable. Couplings The two types of couplings are fifth wheel coupling and automatic. In some applications, no separable coupling is fitted, and the trailer is bolted to the tractor unit, using a bearing, and rocker feet as are used under a fifth wheel skid plate. Fifth wheel coupling The towing vehicle has a wide coupling plate known as a fifth wheel coupling bolted onto its chassis on which the semi-trailer rests and pivots.
As the tractor reverses under the trailer, a kingpin under the front of the trailer slides into a slot in the skidplate, and the jaws of the fifth wheel close onto it. The driver has to raise the trailer legs manually, and couple the airbrake lines and electrical cables. Automatic couplings Many years ago, automatic couplings predominated, but are now quite rare. Automatic couplings were generally used for payloads of 12 short tons (11 t) or less, e.
g. on the Scammell mechanical horse. No coupling plate is used on the tractor; a turntable is permanently fixed to the underside of the trailer. This locks to the chassis of the tractor. When the tractor reverses under the trailer, its legs rise and the brake and electrical connections are made automatically. Almost the entire coupling and uncoupling procedure is operated by the driver from inside the cab, except that he or she has to descend to release (or apply) the trailer parking brake.
Types Different types of semi-trailers are designed to haul different cargoes. Common widths are 8 ft (2.44 m), and 2.6 metres (102.36 in). Box or van trailers are the most common type. Standard lengths in North America are 28 ft 0 in (8.53 m), 32 ft 0 in (9.75 m), 34 ft 0 in (10.36 m), 36 ft 0 in (10.97 m), 40 ft 0 in (12.19 m), 45 ft 0 in (13.72 m), 48 ft (15 m), 53 ft 0 in (16.
15 m) and 57 ft 0 in (17.37 m). Bus-bodied trailers are hitched to a tractor unit to form a trailer bus, a simple alternative to building a rigid bus. Car carrier trailers carry multiple cars, usually new cars from the manufacturer. In the US and elsewhere, car carriers often carry used vehicles as well. Similar variants can carry fork lift trucks, light commercial vehicles and agricultural tractors.
Conestoga trailers are a special form of flatbed trailer with a flexible retractable roof and siding used to carry large pieces of equipment that can only be lifted by an overhead crane, but which also need protection from the weather during transit. Curtain siders or Tautliners are similar to box trailers except the sides are movable curtains made of reinforced fabric coated with a waterproof coating.
They generally have a restraining system of straps and buckles every foot (30cm) or so to keep the curtain tight and adverse to the elements. Also some have removable gates mounted into the trailer, to help reinforce the load and prevent bulges. The purpose of a curtain sider is to combine the security and weather resistance of a box trailer with the ease of loading of a flatbed. Drop-deck trailers (or Step-frame Trailer) have a floor that drops down a level once clear of the tractor unit; the most common types of drop-deck trailers are flatbeds and curtain siders.
Double deckers or deckers have either a fixed, hinged, or moveable second floor to enable them to carry more palletised goods. In general, a double decker can carry 40 pallets, as opposed to 26 for a standard trailer. Double deck trailers are generally a step-frame construction with the majority being either box or curtain siders, with box trailers having either a fixed or movable (floating) deck, and curtain sides having either a fixed or hinged second deck; this hinged second deck generally swings into a position down the length of the trailer, and can be divided into two or three sections to allow greater load flexibility.
In Australia, they are known as mezzanine trailers or mezz-decks for short. Dry bulk ("British" Powder tankers) trailers resemble big tankers, but are used for cement, sand, barite, flour, and other dry powder materials. Dump trailers ("British" Tippers) are trailers in which one end can be raised to allow the cargo (often building materials or Agricultural produce) to slide out the other end. Commonly, they are hinged at the rear and raised at the front, but side-unloading dump trailers also are used.
Flatbeds consist of just a load floor and removable side rails and a bulkhead in front to protect the tractor in the event of a load shift. They can haul almost anything that can be stacked on and strapped down. Hopper bottoms are usually used to haul grain, but can be used to haul other materials. Intermodal trailers are similar in frame design to box trailers, but without any sort of integral cargo-carrying ability as they are designed to carry a variety of standard Intermodal containers Live bottom trailers have a conveyor belt on the bottom of the trailer tub that pushes the load material out of the back of the trailer.
The tub does not have to be raised to deposit the materials. Livestock trailers are used to haul livestock such as cattle, horses, pigs, sheep, etc. Commonly, they have two levels (or three for hogs) to maximize capacity. Lowboy ("British/Australian" Low-loader) trailers are a type of flatbed in which the load floor is as close to the ground as possible, most commonly used to haul heavy equipment, cranes, bulldozers, etc.
Refrigerator trailers are box trailers with a heating/cooling unit (reefer) attached, used for hauling produce, frozen foods, meat, flowers, etc. No quite as common but they are also produced in tautliner models with thicker curtains to sustain the fluctuating temperatures. Refrigerator tank trailers are well insulated or refrigerated to haul bulk liquid foods, such as liquid sugar, water, wine, milk or juices.
Sidelifter semi-trailers have hydraulic cranes mounted at both ends of the chassis allowing for the loading and unloading of shipping containers without the need of a forklift or other container-handling equipment. Also known as a Sideloader. Tank chassis trailers are used for hauling liquids such as gasoline and alcohol. some are designed with a lowered centre of gravity to ensure greater stability.
Generally bottom loaded with the ability to recover any waste vapor for safety reasons. A "frac" tank trailer has a single and fixed axle, and is typically used during hydraulic fracturing at oil wells or for petrochemical industries. It is shaped like a wedge, and when it is unhitched, its bottom side lies flat on the ground. "Wing" is one of the box trailer which used in Japan. Both side panels are opened like a Gull-wing door by motor power.
Trailer types Box trailer (US) Curtain sider trailer (EU) Semi dump trailer (EU) Auto transporter (Brazil) Flatbed trailer (Iran) Live bottom trailer (US) Lowboy (US) Refrigerated trailer (UK) Sidelifter (New Zealand) Tank trailer (Japan) "Wing" van (Japan) STAA double pup 28.5 foot trailers See also Air brake (road vehicle) Articulated lorries Articulated vehicle Brake Cargo Fifth-wheel coupling Fruehauf Corporation Gladhand connector Globe Trailers Jackknifing Long combination vehicle Refrigerated container Refrigerator truck Semi-trailer truck Shunt truck Swap body Tank chassis Teardrop trailer (truck) Trailer Trailer skirt Trailer tail Vehicle category References ^  ^ http://www.
bigtruckguide.com/know-how-to-slide-your-tandems/%20 ^ http://www.truckingtruth.com/cdl-training-program/page113 ^  ^ "Any transport transportations from the Tandem-Trans ??? recheck the link". Tandem-Trans. Retrieved 2011-01-01. ^ a b "Federal Size Regulations for Commercial Motor Vehicles". US Department of Transportation, Federal Highway Administration. Retrieved 2011-01-01. External links Media related to Semi-trailers at Wikimedia Commons Semi trailers' manufacturers and sellers at DMOZ Retrieved from "https://en.
Title: Different Types Of Tractor Trailers