W .D.
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Four-wheel Drive Tractors. Power-operated Tipping Trailer.
STAND No. 92.
TF.W.D., or four-wheel drive, 1 chassis is being shown not only complete with tip body, but also in the stripped form, and provides an excellent opportunity to' those who have' not atudied the method by which driving on all four wheels is attained to do so. It will be seen that Cha engine is placed to one side of the chassis, and farther to the rear than is aqua] v ith_ordinaryi petrol vehicle design, coming actually. partly behind the line of Llietfront axle" The power is taken through a dutch to a three-speed gearbox, and then to the distributing gear below and to the loft
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of it, whence by universal jointed shafts it is taken forward to the differential gear on the frorittaxle, and rearward to the differential gear on the back axle. Each axle is equipped with torque stays. Steering is in no wise affected, and, the driver being placed actually beside the engine, the whole of the space behind the engine is available for load. In addition to theahalf-elliptic springs to the rear axle, -there is an auxiliary transaverse spring supported on a stiff double cross-member of the frame.
Brought to thesoutside of the central
differential casing are two bell-crank levers, which are clearly shown in the drawing which accompanies this notice. By turning either lever, the differential gear to the driving shaft•on that side is locked. All wheels can thus be locked solid to the shaft, or either pair can be driven separately.
The trailer device for the F.W.D. has the Ackermann steering, and is equipped with a tipping body with hinged sides, the tipping gear consisting of a single hydraulic ram operated from the towing vehicle; a flexible pipe being used between the two vehicles. By this means both the towing vehicle and the trailer can be tip vehicles, either vehicle being tipped at one time and to either side or rear; hut, of course, both bodies could not be tipped at one time—it is obviously hardly ever likely to be neces
sary so to do. The chassis is equipped with Belgrave cable cord tyres 40 ins. by 8 ins., whilst the two complete vehicles shown have solid tyres on artillery wheels.