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INTRODUCTION OF INTERN) FIONAL RIGID SIX-WHEELER
Page 66
Page 67
Page 68
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Six-cylindered Petrol-engined Machine of 15-ton Gross-load Capacity, With Power Divider Combining Auxiliary and Split-drive Transmission in Conjunction With a Five-speed Gearbox IN th.... international 15-ton gross-load, rigid sixwheeler, an example of which has just been introduced into this country, operators will find a machine of proved capabilities, as vehicles of identical design are employed extensively on the heaviest class of service, such as is encountered on oilfields and in mining areas in the United States.
This International vehicle is powered by a six-cylindered petrol engine of 31-in, bore and 41-in. stroke, the rated h.p. being 33.7 and the maximum b.h.p. 93.7 at 2,800 r.p.m. ; the maximum torque of 218-lb.-ft. is given at 1,600 r.p.m.
The drop-forged, seven-bearing crankshaft is both statically and dynamically balanced, and has electrically hardened journals. Main and connecting-rod big-end bearings are of the precision, shell-type, the total projected area of the main bearings being 32.1 sq. ins. A drop-forged camshaft, driven by helical gears, operates the valves via vertical push-rods ; hardened inserts are used for the exhaust-valve seatings.
A gear-type pump, located in the sump and driven by helical gearing from the camshaft, is responsible for oil circulation, which is full pressure feed to main, bigend and small-end bearings and camshaft and rockerarm shaft bearings.
The water pump and four-bladed fan, which are mounted as a unit, are driven from the crankshaft by V-section rubber belts in duplicate. Ignition is by battery and coil, the pressure of the whole of the electrical equipment being 6 volts.
Downdraught carburation is employed, a velocity-type governor being mounted between the carburetter and inlet manifold. A large, oil-bathtype air cleaner is fitted.
Mounted as a unit with the engine is a five-speed gearbox having silent third and fifth speeds, the last named being an overdrive. The box provides ratios 1332 of 6.525, 3.722, 1.925, direct and 0.823 to 1 on the overdrive, with a 6.38 to 1 reverse. A 12-in, diameter, singleplate clutch, fitted with a vibration damper, takes the drive to this unit, from whence a short, universally jointed shaft connects to a power divider, combining auxiliary and split-drive transmission. The ratios in this unit provide for a reduction of 1.107 to 1 and an underdrive of 1.6 to 1.
Incorporated in the power divider is a third differential which, when desired, can be locked, the lever being so designed that it must be held by the driver all the time he wishes to keep the differential out of action. This is a safeguard against his keeping it locked when undesirable. Each axle has an independent offset drive, the first axle being driven by a straight-line tubular shaft and the second by a two-piece shaft. The latter is provided with a centre bearing, pivotally held in a stout cradle bracket riveted to the off-side frame member. The universal joints throughout are of the all-metal rollerbearing type.
One-piece heat-treated casings are used for the driving axles, the shafts of which are fully floating. The reduction provided by the spiral-bevel gears is 7.4 to 1.
Driving and braking torque reaction is taken through the springs, in conjunction with two substantial, balljointed. I-section members anchored to upward extensions of the respective differential housings, being taken forward and backward respectively from these points to a frame cross-member.
Equalizing beams, of double I-section, are pivotally mounted in the centre, on downward extensions of the spring cradles, and, fore and aft, are ball-jointed to brackets built into the axle casings.
The spring assemblies are bracecklaterally by means of a tubular cross-member, with vertical king-pin mountings arranged on suitable extensions of the spring cradle castings.
The sturdy construction of the complete bogie s*embly is in strict keeping with the rated grossload capacity of the machine, and close examination of the unit, while negotiating a hole some two to three feet in depth, served to show that it possesses a high degree of independent flexibility. The vehicle is suspended on semi-elliptic springs, those at the back being pinned forward and slidably mounted at the rear, whilst the front springs are shackled at their forward ends and pinned at the rear. Two damper springs are fitted to each front spring and these take the form of a short bowed leaf, located above the master B33 leaf by the foremost and rearmost main spring clips, respectively.
Malleable steel, six-spoke wheels are fitted, and these are equipped with 36-8 Goodyear tyres with twins on the bogie axles Pedal-operated, booster-assisted, hydraulic brakes of the self-energizing type are employed on all six wheels, the hand lever serving to control external-contracting shoes, which .bear on drums secured (one to each) on the driving shafts of the power divider.
The chassis we inspected, which is known as model D.246.F., has a wheelbase of 161 ins., and, with fuel, oil and water, weighs approximately 3 tons 14 cwt. It is to be fitted with a 12-cubic-yd. body having 13. and E. tipping gear.
We understand from Brunt Motors, Ltd., Waterloo Road, North Circular Road, Cricklewood, London, N.W:2, distributor of International machines for London and part of the home counties, that it proposes to introduce three other models with respective wheelbases of 179 ins., 197 ins. and 215 ins, The price of the 161-in, wheelbase chassis, including the usual accessories, is £1,280.