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Double reduction axle 1) Vehicle rear axle with gearing (ie crown wheel and pinion – differential) designed to provide normal and lower drive ratio. Also double reduction hubs – in heavy goods vehicle to reduce stress on differential and half- (ie drive) shafts. See also Hub reduction. Double-manned 1) Vehicle with two-man driving crew (usually) for long-distance/ international operations). EU law makes provision for this by way of reduced rest periods for such operations. Double-drive/bogie 1) On heavy vehicles with two or more rear axles, where at least two of the axles forming a bogie are driven (as opposed to trailing axle/s which is/are not driven). This gives improved traction (eg for use on rough/steep terrain). Double deep racking 1) Pallet racks with frames for two pallets deep using standard automatic pallet racking thereby reducing the number of gangways. Requires a modified fork-lift truck using double length forks. Selecting and putting away stock is slower than single pallet operations. Double-decker 1) As in double-deck bus (ie with an upper deck carrying additional passengers) - common in the Double bottom 1) Form of articulated combination with two semi-trailers, the first mounted on the tractive unit, the second on a towing dolly. |
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