This paper discusses the influence of tip relief, root relief, load modification, end relief and their combinations on gear stresses and transmission errors due to shaft deflections.
Instances of damage to discontinuous form ground and surface-hardened gears, especially of large scale, have recently increased. This may be attributed partly to a faulty grinding process with negative effects on the surface zones and the surface
properties.
Surface coatings or finishing processes are the future technologies
for improving the load carrying capacity of case hardened gears. With
the help of basic tests, the influence of different coatings and finishing
processes on efficiency and resistance to wear, scuffing, micropitting,
and macropitting is examined.