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Foden 8-tonner has Nine Speeds
Page 66
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A LIGHT 8-ton chassis, Weighing 31
tons complete with a compositeconstruction cab and drop-sided body, is to be added to the Foden range and a prototype will be exhibited at Earls Court. It will have a Foden 2.72-litre four-eylindered two-stroke supercharged oil engine, nine-speed gearbox and a hypoid-driven axle.
Equipped with dual-marked 36 by 8-in./9.00-20-in, tyres, its permissible gross weight will be 12 tons in this country, but its overseas laden weight is reduced to 101tons, thus providing for a 7-ton payload.
This chassis is the first to incorporate the four-cylindered version of the Roden two-stroke engine, which develops a maximum of 84 b.h.p. at 2.000 r.p.m. and a torque peak of 235 lb.-ft. at 1,500 r.p.m. It works on the same principle as the six-cylindered unit, incorporating the Kadenacy system in which a low-pressure blower delivers air to a chest, where it is passed into the cylinders through targential ports to promote swirl.
Wet cylinder liners are used and the five-bearing crankshaft has steel-backed white-metal-lined shells. Other unusual details include cast-iron pistons and a hydraulically governed fuel-injection pump mounted on the blower.
The engine, which is a short and shallow unit, is carried low in the chassis, occupying a position between the seats in the cab, with the top almost below floor level. The fan drive passes through a cross-member, and with the radiator almost below frame level, the cab' floor is unimpeded, except by the fan tunnel, and the floor well extends the full width of the cab. This is unusual in a forward-control 'lorry having the engine in the normal vertiCal• poSi-. lion, and provision could he made for two loaders to be seated in the cab. ..
A 14-in.-diameter clutch is used, and attaehed as a unit with the engine is a Short three-seed gearbox Which includes, at the rear, a compound epieyclic train of gears, affording overdrive, direct and reduction ratios to the three main gears. In addition to the main gear lever, another control is placed alongside to operate the auxiliary gear.
Although the main gears are dogengaged, the auxiliary portion employs spring-loaded dogs, providing a pre. selective action. When the auxiliary lever is moved, the dog slides towards the position for engagement, but the change is not made until the load is
reversed on the gear teeth or the clutch pedal is depressed.
Light-alloy castings are provided for the integral crankcase and cylinder block and for the two sections of the gearbox. Cross-shafts are arranged in the gear-selector linkage and the levers can be placed for rightor left-hand control. The main gearbox has ratios of 3.0, 1.8 and 1 to 1 forward and the epicyclic gear provides an overdrive of 0.745 to 1, direct drive and 3.416 to 1 underdrive. The overall gear spread is 10.995, affording a speed range of 144 m.p.h. to 47.4 m.p.h. at :2,000 r.p.m. engine speed.
The transmission includes a hypoid final drive, and employs Hardy Spicer shafts with a centre 'bearing pivoted on two rubber hushes attached to the frame. A pump is incorporated in the Kirkstall axle. The braking system embodies two-leading-shoe units actuated by Lockheed hydraulic equipment, with assistance from a Foden enginedriven booster. Cast-iron brake drums
16 ins, in diameter are fitted, the shoes at the front being 3 ins, wide and at the-rear, 44 ins.
Fox lightweight springs, which are relieved on the lower side of the leaves.
help to reduce weight. The frame, 9 ins, deep, in. thick and having a 31-in, flange, is parallel, with full-depth cross-members, four of which coincide in position with the spring brackets. The 8-tonner has a 12-ft. 6-in.
wheelbase. The body, which overhangs the rear axle by 4 ft. 9 ins., is 17 ft. long and 7 ft. 5 ins. wide. The length of the vehicle 'from front bumper to tail chock is 22 ft. 41 ins.