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Aviation History
1918
1918 - 0687.PDF
JUNE 20, 1918. IT-' O O O O O 0 0 .'.."••••";: Fig. 8.—Sectional view of oil pump. -•'•'''i;"— ••• •"•'" "~ •• ••'•'•" •• O O O O OIIO O oo o o o o o o o o o o o o o oo oo oo o o o o o o o o o unusual. This method is similar to that adopted in the 260 h.p. engines, and is so designed as to allow of a certain amount of vertical adjustment of the bevels. The driving end of the vertical shaft is machined and ground parallel, 21 mm. diameter, and is fitted with a key, which fits in a key- way in the driving bevel; a ground taper on the bottom extension of the bevel, which is split by four saw cuts, and into which screws a ring nut, locks the bevel securely in position on the vertical driving shaft. In the old 160 h.p. Mercedes engines the camshaft driving bevel on the vertical shaft is fixed by two bolts in the split extension of the bevel which is fitted on to a ground taper on the vertical shaft. Referring to the sketch of the vertical shaft, it will be seen that the bottom end of the shaft is carried on a " Skefko " universal bearing, which is mounted inside a steel sleeve, carried at the rear end of the crankcase, and is driven off the floating bevel gear on the rear end of the crankshaft in the usual way. Lubrication. The old 160 h.p. type multiple-plunger oil-pump has been replaced by the larger pump, similar in design to the 260 h.p. Mercedes pump. The oil pump is attached to the bottom of the rear oil sump or reservoir, at the rear end of the base chamber. * The functions of the oil pump are perhaps most clearly demonstrated in the diagrammatic sectional drawing, Fig. 7, and in the sectional sketch of the pump, Fig. 8. Briefly described, the functions of the oil pump and the system of lubrication may be sub-divided into three circuits. (a) The main pressure circuit, in which oil is drawn from the main oil sump at the rear of the base chamber and is forced to the main crankshaft journal-bearings and connecting rod bearings, and also the camshaft bearings. (6) The supplementary pressure system, which works in conjunction with the main high-pressure system, in which two auxiliary plungers of the main oil pump draw a small charge Fig. 9.—Sectional view of water pump. 685
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