There are no means of distributing or transferring load from the third axle to the tandem axles other than through the trailer structure.Īxle, Tridem: A three-axle assembly having a means of equalizing weight between the three axles, which are equally spaced.Īxle, Trunnion: A short axle pivoted at or near its mid-point about a horizontal axis transverse to its own centerline. Third axle separated ahead or behind the tandem axles. A list of common semi-trailer terms and definitions commonly used in the freight, transportation, and trucking industries in the United States.Īir Control System, Suspension: An arrangement of valves and tubing connected to the trailer air system, which is designed to regulate the ride height (or mounting height) of an air suspension.Īir Leveling Valve: (See Valve, Air Leveling)Īuto Transporter: (See Trailer, Auto Transporter)Īxle: A beam with a spindle or spindles about which wheels rotate.Īxle, Air Lift: A single air operated axle which when lowered will convert a vehicle into a multi-axle unit and provide the vehicle with a greater load carrying capacity.Īxle, Camber: The controlled convexity of a trailer axle designed to compensate for deflection of the axle under load, to compensate for the curvature or crown of certain roads and to minimize tire wear thereby.Īxle, Drop: An axle in which the centerline of the beam portion is lower than the centerline of the spindles.Īxle, Flip or Removable: A frame and axle which can be rigidly pinned or pivoted at the rear of a trailer or an axle assembly that can be flipped up and onto the rear of the trailer to which it is attached.Īxle, Multi: A grouping of axle along the length of a trailer designed to distribute the load over as large an area of road surface as possible.Īxle, Single: The machine steel journal or shaft (usually heat treated and hardened) at each end of an axle, which is contoured to accept wheel bearings and seals, and around which the wheels rotate.Īxle, Spindle: One axle mounted independently of any other axle.Īxle, Spread Tandem: A two-axle assembly in which the axles are separated beyond the spacing of a normal tandem assembly in order to qualify for maximum axle loads allowed by regulations.Īxle, Tandem: A two-axle assembly having a means of distributing or transferring weight between the two axles.Īxle, Tri: A three axle configuration consisting of tandem or spread tandem axles at the rear and a single, liftable.
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