. Automotive industries . hichprovides 1 ft. of chain speed per revolution per minute ofthe engine. For silence, it is undesirable to use fewerthan 18 teeth in the crankshaft sprocket. This, of course,means 36 teeth in the camshaft sprocket to secure thehalf time. A driven sprocket is permissible with as fewas 14 teeth, but not less. The recommendation of theMorse company is that all sprockets of less than 31 teethshould be made of low carbon steel; that is, from 10 percent to 20 per cent carbon O. H. carbonized and hardened1/32 in. deep. Sprockets of more than 30 teeth can bemade of high carb
. Automotive industries . hichprovides 1 ft. of chain speed per revolution per minute ofthe engine. For silence, it is undesirable to use fewerthan 18 teeth in the crankshaft sprocket. This, of course,means 36 teeth in the camshaft sprocket to secure thehalf time. A driven sprocket is permissible with as fewas 14 teeth, but not less. The recommendation of theMorse company is that all sprockets of less than 31 teethshould be made of low carbon steel; that is, from 10 percent to 20 per cent carbon O. H. carbonized and hardened1/32 in. deep. Sprockets of more than 30 teeth can bemade of high carbon steel, heat treated, semi-steel casting,or of a very good grade of cast iron. Another one of the fixed rules in connection with theMorse chain and generally applicable to all chain installa-tions is that it is undesirable to drive any chain withless than 90 per cent chain contact on any of the driven Layout of typi-cal three-wheel,Morse silentchain drive,showing com-putation of cam-shaft lag due tolengthening o sprockets, and not less than 100 deg. contact on the drivingsprockets. The importance of proper adjustment means cannot beexaggerated in the installation of the chain drive. Tosecure the full efficiency of the chain and to reap the ad-vantages, particularly as far as silence is concerned, somemeans of taking up the normal stretch must be accessible chain adjustment equal to one full link mustbe provided, and it must be remembered that this adjust-ment should be accessible or it will not be given the atten-tion necessary. There are several forms of chain adjust-ments, the most suitable means depending upon the typeof layout. For istance, on a triangular drive where thethree points of the triangle are made up by the crank-shaft, camshaft and generator sprocket, a very accessibleand satisfactory adjustment may be provided by the useof the S. A. E. standard generator flange. This is shownin the S. A. E. handbook, Vol. 1, pages B-17 and flang
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
