Nomenclature5 ME350 Pitch Circle(节圆) The pitch circle is a theoretical circle upon which all calculations are usually based.Pitch circles of a pair of mating gears are tangent to each other. .Pitch Diameter,d The diameter of the pitch circle.It depends on the spacing between gear centers and is not an intrinsic dimension of an individual gear. .Pinion Smaller of the two mating gears Gear Larger of the two mating gears 31
ME 350 31 Nomenclature 5 •Pitch Circle(节圆 ) ¾ The pitch circle is a theoretical circle upon which all calculations are usually based. Pitch circles of a pair of mating gears are tangent to each other. •Pitch Diameter, d ¾ The diameter of the pitch circle. It depends on the spacing between gear centers and is not an intrinsic dimension of an individual gear. •Pinion ¾ Smaller of the two mating gears •Gear ¾ Larger of the two mating gears
Nomenclature5 ME350 .Number of Teeth,N Circular Pitch(节距)，p The distance,measured on the pitch circle,from a point on one tooth to a corresponding point on the adjacent tooth Equal to the sum of the tooth thickness and the width of the space. >Pitch of the two gears in the mesh must be identical. 32
ME 350 32 Nomenclature 5 •Number of Teeth, N •Circular Pitch(节距), p ¾ The distance, measured on the pitch circle, from a point on one tooth to a corresponding point on the adjacent tooth = Equal to the sum of the tooth thickness and the width of the space. ¾ Pitch of the two gears in the mesh must be identical
Tooth Nomenclature5 ME350 Face width Top land Addendum circle Face Addendum Circular pitch Tooth Width Pitch Dedendum thickness Flank of space circle Bottom land Clearance 《《 Fillet radius Dedendum circle Clearance 33 circle
ME 350 33 Tooth Nomenclature 5
Nomenclature5 ME350- ndondp p= NG Np pP=π 'p circular pitch .P=diametral pitch dG gear pitch diameter .NG Number of gear teeth dp=pinion pitch diameter .N.Number of pinion teeth 34
ME 350 34 Nomenclature 5 •p = circular pitch •P = diametral pitch • d G = gear pitch diameter • N G = Number of gear teeth • d p = pinion pitch diameter • N p = Number of pinion teeth p p G G N d N d p π π == pP = π
Nomenclature5 ME350— Module(模数)，m The ratio of the pitch diameter to the number of teeth. Customary unit of length used is the millimeter. The module is the index of tooth size in SI. d m N 35
ME 350 35 Nomenclature 5 •Module(模数), m ¾ The ratio of the pitch diameter to the number of teeth. ¾ Customary unit of length used is the millimeter. ¾ The module is the index of tooth size in SI. N d m =