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Berna . . 72
Page 6
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THE Berne petrol-engined 0-tonner in its latest form is the main feature on this stand, and beside it is seen the Berna oil engine.
The 6-tonner is a sturdily built chassis and embodies an interesting form of final drive which, although not different in principle from that seen in the old Berne models, has just recently been greatly improved.
An important feature is the doublereduction type of final drive. A dead load-carrying axle is employed for the rear wheels, and exposed shafts from the bevel drive at the centre extend to the wheels, carrying at their ends four pinions which engage in internally toothed rings in the wheels. This internal-gear drive has been entirely redesigned so that it is now properly enclosed as a separate unit, and works in an oil bath. Although two pairs of brake shoes are fitted in each drum, the brake mechanism is entirely separate from the final-drive compartment. The main advantage of this is that oil cannot escape on to the brake surfaces.
D16 The brakes, it may be mentioned, are operated hydraulically, the actuating cylinders being mounted at the centre of the axle and operating upon the cam-spindle levers. In this position the cylinders are accessible for adjustment or inspection, whilst being far removed from the frictional source of heat in the brake drums.
The engine, which is automatically governed, is a four-cylindered overheadvalve unit of 115 mm. bore and 170 ram. stroke and it develops about 75 b.h.p. The cylinder block is cast in one. The crankcase and sump cover are of aluminium, as are the pistons. Lubrication is by means of a pair of pumps working in tandem, and on the new model the exhaust manifold is made in two parts. On the Berns., as users of this make will know, a multi-plate clutch has been one of the features. This unit is retained in the latest models, as it proves to be satisfactory, and the four-speed gearbox is separately mounted amidships, thus enhancing accessibility.
The appearance of the model now on show is improved becausk a higher radiator has been adopted. The tyres, fitted to Simplex wheels, are 40-in. by 8-in, pneumatics, twins being fitted at the rear.
An example of the Deutz oil engine is shown on this stand.—Lawson Pigott Motors, 320, King Street, London, W.O.