Design and materials selection for power-transmitting gears

Abstract

The great majority of all power gears are manufactured in hardened or case-carburized steel, with a smaller number manufactured from cast iron and from non-metallic materials such as thermoplastics and laminated bonded wood, fabric and paper materials. The choice of material depends on the power to be transmitted and the running speed. Following an introduction to the principles of gear design, the selection of appropriate gear materials - their fatigue strength and permissible stress levels - is discussed.