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Relay valve. A relay valve is an air-operated valve typically used in air brake systems to remotely control the brakes at the rear of a heavy truck or semi-trailer in a tractor-trailer combination. Relay valves are necessary in heavy trucks in order to speed-up rear-brake application and release, since air takes longer to travel to the rear of ...
Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence.The two major types of device in use are trailer skirts (or side skirts), affixed to the underside of trailers, and trailer tails (or boat tails, or rear fairings), affixed to the rear.
A cab over semi-tractor. Tractor with an end-dump trailer. A FAW semi-trailer truck in China. A semi-trailer truck[1] (also known by a wide variety of other terms - see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.
Semi-trailer. A tractor unit pulling a semi-trailer. A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). [1]
An articulated (jointed) combination vehicle, often composed of a 10-wheeled (three axle) tractor and a 4-wheeled (two axle) trailer. There are also two axle tractors, single axle trailers, and occasionally combinations with extra lift axles. In some applications a semi can pull additional full trailers (doubles and triples) with the use of a ...
Jackknifing is the folding of an articulated vehicle so that it resembles the acute angle of a folding pocket knife. If a vehicle towing a trailer skids, the trailer can push the towing vehicle from behind until it spins the vehicle around and faces backwards. This may be caused by equipment failure, improper braking, or adverse road conditions ...
Air suspension is used in place of conventional steel springs in heavy vehicle applications such as buses and trucks, and in some passenger cars. It is widely used on semi trailers and trains (primarily passenger trains). The purpose of air suspension is to provide a smooth, constant ride quality, but in some cases is used for sports suspension.
The first 170 vehicles were all delivered by December 2004. They were delivered on a one-for-one basis with Oshkosh 635NL five-axle semi-trailers. By late 2009 around 249 systems had been ordered. [4] An award for M1070A1 to Egypt is pending. [9] Iraq (60 M1070A0 delivered) Iraq had received 60 M1070 with 635NL semi-trailers by May 2011. [4]