Gear Technology Magazine
www.geartechnology.com/articles/20241-high-power-transmission-with-case-hardened-gears-and-internal-power-branching

High Power Transmission with Case-hardened Gears and Internal Power Branching

January 1, 1985
In the field of large power transmission gear units for heavy machine industry, the following two development trends have been highly influential: use of case hardened gears and a branching of the power flow through two or more ways.