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About: Fifth-wheel coupling     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.org associated with source document(s)

Type: yago:WikicatTrucksyago:Artifact100021939yago:Container103094503yago:Conveyance103100490yago:Instrumentality103575240yago:MotorVehicle103791235yago:Object100002684yago:PhysicalEntity100001930yago:Self-propelledVehicle104170037yago:Truck104490091yago:Vehicle104524313yago:WheeledVehicle104576211yago:Whole100003553 New Facet based on Instances of this Class

The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin, a 2-or-3+1⁄2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with the kingpin at the center) rotates against the upward-facing surface of the fixed fifth wheel, which does not rotate. To reduce friction, grease is applied to the surface of the fifth wheel. The configuration is sometimes called a turn-table in Australia and New Zealand, especially if it is a rotating ball-race-bearing type. The a