Paper 19. Proportions of Automobile Change Speed Gear Teeth

Abstract

Information on the proportions and operating conditions for gear teeth in a range of passenger and commercial vehicle gearboxes is reviewed, and it is explained that such information provides important design data. The operating conditions are considered in terms of sliding velocity, surface contact stress, and root bending stress for the transmission of maximum engine torque. For convenience, methods given by Professor Tuplin have been used for the calculation of tooth stresses, and these have later been combined with a design procedure which may be helpful when considering applications where background experience is limited. The influence of material, production processes, heat treatment, etc., on endurance in terms of root bending fatigue, surface pitting fatigue, and scuffing is discussed, and for this purpose reference is made to past M.I.R.A. research work.