. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ing engines an allowance of 1200 lbs. is too high. Thefollowing rule, however, may be followed where P is the maximum load onthe piston, d is the diameter and I the total length of gudgeon or crossheadarms in inches, and R the revolutions per minute. , , _ P X VR -J- 100 ^ 12:500— Then for any engine Diameter of crosshead = —, ^ y^^ —• 12,500 X I Of course, the maximum load on the crosshead is really the reaction of theconnecting-rod, but, to avoid any complication of the calculation, it is
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ing engines an allowance of 1200 lbs. is too high. Thefollowing rule, however, may be followed where P is the maximum load onthe piston, d is the diameter and I the total length of gudgeon or crossheadarms in inches, and R the revolutions per minute. , , _ P X VR -J- 100 ^ 12:500— Then for any engine Diameter of crosshead = —, ^ y^^ —• 12,500 X I Of course, the maximum load on the crosshead is really the reaction of theconnecting-rod, but, to avoid any complication of the calculation, it is sufficientto take the load on the piston. tlSTON-ROD CROSSHEADS AND GUDGEONS. 171 AVheu the diameter of the crosshead journal is calculated by the first rule,the length is usually made equal to it. Direct-acting engines have usually a gudgeon secured to the connecting-rod (fig. 52), which works in a bearing in the piston-rod end (figs. 45and 46); or have the gudgeon at the piston-rod end (figs. 47, 48, and 49),and connecting-rod (figs. 53 and 53a) swung on it by brasses, &.C., on cither. P=(
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