Gear Nomenclature

Appendix D: Gear Nomenclature Symbol Definition C Cp CH Cf CL, KL Cm, K m C o, K o C R, K R Cs, Ks Cs, Ks Cv, Kv d E F h J mN NG NP np Pd S Sac Sat Sc St Tb Tf Ti

Center distance (inches). Influence coefficient, depending upon the elastic properties of the materials. Hardness ratio factor. Surface condition factor. Life factor. Load distribution factor. Overload factor. Safety factor. Size factor. Temperature factor. Dynamic factor. Diameter, pitch, operating pinion (inches). Young’s modulus. Face width, effective (inches). Film thickness, minimum (inches). Geometry factor (bending fatigue). Ratio, loading sharing. Number of teeth, gear Number of teeth, pinion Revolutions per minute, pinion number. Diametral pitch transverse, operating. Surface finish, RMS, (after running in). Contact stress number. Bending stress number. Contact stress number, calculated. Tensile stress number, calculated. Temperature, gear blank. Flash temperature index (
F). Temperature, initial (
F). 725