Underfloor-engined Bus for 130 Passengers
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WilTH the same general chassis YV specification as the Type 12,00 uoods vehicle, the new Bussing threeaxled underfloor-engined double-deck bus has a capacity for 75 sitting passengers and 55 standing, The average frame height has been reduced to a minimum by upsweeping the side members over the engine and rear axles, and the height of the bus has been kept to 13 ft. ins. This is approximately J. ins, higher than the bus with a vertical power unit.
The overall length of the chassis is 39 ft. 44 ins. (12 tn.), which corresponds to the maximum permitted length of the body. It is equipped with 14.00 by 22-in. tyres and the loadcarrying capacity is apparently the same as that of the goods-vehicle chassis, which is rated at 15 tons 14 cwt.
13.5 Litres: 180 b.h.p. .
The chassis is powered by a sixcylindered indirect-injection oil engine developing 180 b.h.p. at 1,600 r.p.m., which has a bore of 51ins, and a stroke
of 6 ins., giving a total displacement of 13.5 litres. The unit is cooled by a forward-mounted radiator, and automatic clutch control of the fan may be specified as an extra.
The drive is transmitted by a twinplate dry clutch to an overdrive-top five-speed gearbox, in unit with the engine, and an air-operated auxiliary box, which provide 10 forward and two reverse ratios. The overdrive ratio is 0.697 to 1 and, in the higher range, this enables a lop speed of about 38 m.p.h. to be attained.
Two propeller shafts are employed far the drive from the• auxiliary gearbox to the two double-reduction rear axles, the hand-operated transmission brakes being also duplicated. The foot brakes are hydraulically actuated with compressed-air assistance.
Some of the chassis are destined for Berlin, and to compensate for the inferior quality of the available. brake facings, the shoes are recessed at the rivet points to increase the width of material between the friction surface and rivet heads.
A feature of the triple-spring rear
suspension units is the use of rubber blocks at the end contact faces of the upper springs. These give a helperspring characteristic with more progressive application than the normal type. Shackles at the front and rear are rubber-bushed.
Other features of interest include airassisted steering, a built-in engine hoist, one-shot chassis lubrication, a tyreinflating device and non-oscillating flexible engine suspension.