York designs for next centun
Page 14
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YORK TRAILERS' engineers have developed a tipping trailer which they say is designed to meet the needs of the top-weight long-haul market for the next 20 years.
The York Magnum 27, is claimed to have a higher payload, lower overall height, and better fuel consumption, than conventional tipping trailers, as well as improving stability and safety when tipping.
The step-frame tri-axle semi-trailer provides for a 27tonne payload and 43.8m (57 yd3) capacity.
Stiff hexagonal crossmembers, extend through the deep Below: York Trailers is tooled up to produce 20 a week of its new low-weight, low-height, maximum-cube brelker semitrailer. 450mm 1-section mainrails by 277mm.
A wider than normal I,345mm spring base improves roll stability.
Triaxle Magnum 27 models are equipped with 15R 22.5 tyres as standard while the tandem version is shod with 16.5R 22.5 wide singles.
York's TST tri-axle and tandem rocker beam suspension is standard equipment, but trailing arm air suspension is available.
All of the surfaces which face forward, including the shallow rain housing, are angled rearward at between 20 and 45 degrees.
To achieve a clean discharge, the ram housing is mounted externally and bending loads on the swan neck are small as the ram thrust is transmitted directly through the kingpin.
Ahead of the landing legs, chassis mainrails taper in depth to only 150min and, using 2.3m longitudinal body floor members and only 6nmi-thick transverse wearing strips in the front portion, the body platform can be lowered to within 19 of the kingpin rubbing plate.
The tailgate, braced by a deep horizontal rib at midheight, is very rigid.
Modern high-strength materials have been used throughout. Unusually high-tensile steel is specified for the 1-beam web and 130nun flanges. It is said to be 3(1 per cent stronger in yield than steel commonly used for trailer frames.
The body is fabricated entirely from N8-grade sheet aluminium apart from the side wall top rails.
Folded ribs and floor crossbearers are stronger and easier to repair than equivalent extrusions.
The flat folded panels in 6nim sheet eliminate welding at critical stress points. Side panels are manufactured from 4n iii material reinforced by 140min-wide vertical pillars.
Exteiisive fuel consumption tests over the past few months, showed improvements of 11.5 per cent, say York.