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Aviation History
1922
1922 - 0008.PDF
V • . • Side elevation, section, C-6,6-c which general of the yl. aero in V part Curtiss en £ine, is similar in detail CD-X2. to • the flanged and bolted to the upper half at the centre line of the crankshaft. This case carries the oil-pump drive shaft and the oil reservoir, which is separated from the crank-chamber by a sheet-aluminium partition. The suction pumps are piped to each end of the case into small sumps, so that the crank-case cannot be flooded when the engine is out of normal position. An oil gauge of the cork-float type, with a dial on the outside of the crank-case, is fitted. On the anti-propeller end of the engine is mounted a casting which carries all the shafts necessary for driving the oil pump, water pump, revolution counter, electric starter, magnetos, generator, synchronisers and camshaft drive-shafts. This assembly consists of one unit and can be removed as such. All shafts and gears are put together with stud-toothed splines. The camshafts are driven through two drive-shafts by mitre gears. This is made possible by the use of a short vertical shaft extending from the crankshaft up to the point where lines from the exhaust camshafts form the prepe r angle for mitre gears. The generator drive is taken off the top of this vertical shaft, and the synchroniser drives are taken from the two camshaft drive-shafts by forming bevel gears on these shafts at approximately their centre. The tachometer drive is taken from a lower vertical shaft from bevel gears. This lower vertical shaft drives a water pump through a squared floating coupling, and also drives the oil pump through bevel and helical gearing, which is mounted on the top of the oil pump. A pad is formed on the gear-case to take the Bijur starter, which was developed for the Liberty engine. The magnetos are driven through flexible couplings and bevel gears from the upper vertical shaft. All the shafts in this gear-case run at one and a half crankshaft speed. Connecting rods are of I-beam section of the articulated Sectional tions of C-12 aero * end eleva- the Curtiss engine, which varies but slightly from the CD-12. " ^Tri. ;LCKIH ~T«RO' PISTON. SS.CTIOW TW WPilT PW, 8
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