Honda CB350 CL350 [56/219] Upper and lower crankcase 45

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3 5 UPPER AND LOWER CRANKCASE strength and service life are mounted in place with dowel pins Further main bearing are held in place by main bearing holder bolts the right and left crankshaft counter weight center crank shaft are individual parts press fitted to make up the crankshaft assembly It is therefore possible to use the roller bearing in the connecting rod large end and also in the main bearings 45 X The crankshaft balance which is so important in providing riding comfort has been designed to a balance of 60 5 X Fig 3 91 Balance CRANKSHAFT BALANCE The balance A is computed by the following equation A m MX100 X m Gyrating mass m is the unbalanced ob tained by subtracting the mass of the crankpin and the connecting rod from the total weight of the counterweight M Reciprocating mass piston piston pin and connecting rod The X X and Y Y axes are shown in Fig 3 91 First consider the case in which the crankshaft is perfectly balanced m 0 The cycle of inertial force applied to the shaft 0 due to the reciprocating mass M in the X X direction develops into engine vibration This is called 0 balance Fig 3 92 Next if a weight equal to 30 of M counter weight is attached to the opposite side of the crankpin the size of the inertial force in the direction of X X is reduced to 0 7 XM However the crankshaft becomes unbalanced m 0 3 and develops a centrifugal force which will produce a vibration in the Y Y direction This is called 30 balance Fig 3 93 In other words the vibration in the X X direction has diminished but increased in the Y Y direction by the like amount This total has been expressed in percentage Fig 3 92 0 Balance X Fig 3 93 30 Balance X If the counterweight is made equal to M the total vibration in the X X direction will be trans ferred to the Y Y direction This is called 100 balance Fig 3 94

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