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Aviation History
1918
1918 - 1032.PDF
SEPTEMBER 12, 1918. Figs. 23 and 24.—Top half of crank-case, and below, inside view of crank-case, top half. of each crank-web and led through a channel into the hollowcrank-pins, thence through a small hole bored radially in each crank-pin to the connecting-rod big-end bearings. Fromthe big-end bearings the oil is forced upwards to the small- end bearings, with their floating gudgeon pin bushes of castiron, through the steel pipe fixed in the centre of the con- necting-rods. Details of this design have already been given.Fig. 31 is a detail sketch of one of the aluminium oil scoops, which are bolted in pairs to the crank-webs by a bolt whichpasses through the centre of the end crankpin. From the front end of the main oil pipe a steel pipe isconnected by a union, which leads to a hole drilled in the crankcase casting, and serves to lubricate the bearings ofthe camshaft intermediate gears. A restricting plug is fitted into the end of this oil lead, and a similar restriction is pro-vided in the end of the main oil lead back into the crank chamber, as shown in the lubrication diagram. A check valve, it will be noticed, is fitted in the main oilsupply system. This check valve, together with a small spring-loaded pressure relief valve, is situated inside a smalldetachable valve chamber, which is attached to the bottom of the crank chamber just beneath the main oil pump. Itwill be noticed in the lubrication diagram that the excess oil pressure is delivered back into the oil pipe on the supply sideof the pump. An oil pressure gauge is connected to the main oil lead as shown, and small oil pipes are also takenfrom the main pressure pipe to the small crank chamber of the petrol pump, and also to the water pump driving spindle. The two scavenger oil pumps, situated one at either endof the base chamber, are designed so as to draw off the return oil which collects in the small detachable oil sumpsin the bottom of the oil base, and to return it to the tank from either end. •These scavenger pumps are connected together by a steel .\ Fig. 25*—View of base chamber showing oil pumps. 10*2
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