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Aviation History
1918
1918 - 0041.PDF
JANUARY IO, 1918 •CHt! the serrated bore of the driven bevel gear. When the compression stroke, and to close it 44 degrees befort -u^xx :„ A ,„ +^ ;*r i;m;+ *vf mAvomont tnwarHtf ton rlparl f-pntrp The hardened steel rollers on thecamshaft is drawn to its limit of movement towards the rear, the half compression cam is drawn into line with the roller end of the exhaust valve rocker arm, thus giving a slight lift to the exhaust valve as top "dead centre. The hardene the cam rocker arms are bevelled off •. at 45 degrees on one side to allow of f~ j easy engagement of the half corn- Fig. 13.—Arrange- ment of camshaft and half-compres- sion gear. Fig. 12.—Details of camshaft driving pinion on top end of vertical driving shaft. the camshaft rotates. The half compression cam is so positioned on the camshaft as to open the exhaust valve 12 degrees after bottom dead centre on the I I - -> ^^i^S^sMy* -xx Fig 14.—Details of connecting rod. pression cam, which is also bevelled at 45 degrees. The details of this gear are clearly shown in the scale longitudinal sectional drawing of the rear end of the camshaft driving gear (Fig. 10). Connecting Rods.—The connecting rods are ot normal design, and are of H section forgings machined from steel forgings, and measure 326 mm. between centres. The total weight of the complete connecting rod including the small end bush, is 7 lb. The weight of the big end complete is 4 lb. 14 oz., and the weight of the small end 2 lb. 2 oz. The thickness of the centre web of the H section is 2.5 mm., and that of the two outer webs is 3.5 mm. The diameter of the big end bearings is 64 mm., and the length 80 mm. These are split in the usual manner and held by four 12-mm. bolts. The distinctive feature of the connecting rods is the floating gudgeon pin bush, the design of which is similar to that used on the ibo h.p. Mercedes. The bush is of hardened steel ground 2.5 mm. in thickness, the outside diameter being 42 mm., and the inner diameter 37 mm. The bush is a perfect working fit in the small end, and also on the gudgeon pin ; and is lubricated by 14.5 mm. holes drilled radially in the bush, oil being supplied by a 6-mm. pipe leading upwards from the big end bearing. The pipe, which is of soft mild steel, is attached to the central web ot the connecting rod by two riveted clips. Details of the connecting rods and floating gudgeon pin bush are given in Fig. 13. (To be continued.)
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