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Aviation History
1917
1917 - 1332.PDF
1,873 c.c, and the total amount of water carried in the engine without radiators equals 30.9 lbs. Two rectangular honeycomb radiators are fitted, one on each side of the machine. The Petrol Pump. The automatic petrol pumps, which have recently been fitted, constitute one of the most interesting DKCIMBER 20, 1917. the lower portion of its cylinder extends nearly to the bottom of a chamber which contains a deter- mined quantity of castor oil. The piston is operated by a small connecting rod, which is driven through worm gears by a spindle forming an extension of the inlet camshaft. Referring to the drawing of the pump and the Fig. 2 3.—Ar- rangement of petrol pump and section through pressure reser- voir. features of the 230 h.p. Benz engines. Its function, of course, is to supply petrol under pressure to the carburettor without the disadvantages of using petrol tanks under pressure. The pump is used in conjunction with a supplementary pressure reservoir inside the main petrol tank, as shown in the diagram- matic sketch (Fig. 25). The system includes an auxiliary petrol tank and semi-rotary hand pump. Constructional details of the device are shown in the general arrangement of the pump (Fig. 23), and the functions and operation of the pump and the supplementary pressure reservoir are explained in the diagram. The petrol pump consists of a small piston of cast iron, 40 mm. diameter, working in a cylinder or sleeve of phosphor-bronze, open at both ends. The piston is arranged below the crank, and diagram, the working principle of the device is asfollows :— Petrol in the main tank enters the petrol pump through the filter at the side of the pump and, on the upward stroke of the piston, with the corres- Flg. 22. — Arrangement of wireless drive friction clutch. Fig. 24,—Component parts of petrol pump. 1332
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