Spur Gear Selection - Cross & Morse

Tel +44 121 360 0155 Fax +44 121 325 1079 Email For a required centre distance and gear ratio a suitable pair of spurgears can be selected used and assessed by the following numbers of teeth in gears and module (pitch). gear Ratio i = Shaft centre distance in mm = sum gear teeth xpitch= (Z1+ Z2) PFrom this initial Selection each gear can be assessed for strength andwear using the following formulae. The least of the four calculatedpowers is the capacity of the gear set. The capacity required isdetermined by multiplying actual power by a service factor relativeto driver and driven equipment, refer page 3. If calculated power isbelow required capacity increase pitch or face width of gears, adjustteeth sizes accordingly, and reassess drive. If calculated power issubstantially in excess of required capacity a lower Module couldbe considered. Strength capacity Ps= XbxSbxYSxF xN xZ xP2kw19,100 x103 Wear capacity Pw = Xc x Scx YZx Fx Nx Zx ,000 x103 Where:- F = Face width mmN = gear shaft speed = gear pitch, Module Bending stress for gear material (see below)Sc = Surface stress for gear material (see below)Xb= Speed factor for strength - see table 1Xc= Speed factor for wear - see table 2YS= Strength factor - see table 3YZ= Zone factor - see table 4Z= Number of teethSpur gear Selection9 Factors Sb

Tel +44 121 360 0155 Fax +44 121 325 1079 Email sales@crossmorse.com For a required centre distance and gear ratio a suitable pair of spur

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