By K. Newton
For fifty years this has been thought of a typical textbook for the scholar and practicing engineers within the motor undefined. it is a revised variation.
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Consider a 90 ~ twin engine, that is, one which is provided with two equal cylinders having their centre lines at fight angles to each other in the same plane and both connecting rods driving on to a common crankpin. Suppose ,--t-P Fv =! V --I s , /, ' Fig. 2 Fig. 3 '- . . . . Fv ] ~ Fig. 4 90~ engine % Engine balance 29 that the engine is placed with the centre line of cylinder V vertical as in Fig. 4. The centre line of cylinder H will then be horizontal. ) are already completely balanced by the addition of a suitable balance mass opposite the crankpin, incorporated in the extended crank webs.
10 Torsional vibration Under the combustion impulses the shaft alternately winds and unwinds to a small extent, and as with all types of strain and vibration there is a certain natural frequency of this action. The longer and more slender the shaft and the larger the crank masses incorporated in it, the lower will this natural frequency be, and it may be so low as to equal the frequency of the combustion impulses at some particular engine speed. Resonance will then occur between the forced impulses and the natural frequency of the shaft vibration giving rise to dangerous torsional strain.
The front mounting would be placed high, as near to the principal axis as possible, and would take the balance of the bump loads as determined by the position of the mass centre. In the Chrysler mounting shown in Fig. 15, all reactions are distributed between the front and rear mountings, snubbers only being provided at the flywheel housing. 14 also indicates the centre of percussion, CE The position of the CP is determined by the destribution of the mass relative to the rear suspension or pivot point, which in effect is the centre of suspension, CS.