Transmission Gears
Transmission Gears
(OP)
I am currently designing an automotive transmission for a high horse power / high RPM application. My question is the gear material (Steel) selection and heat treat process?
Is there a better choice than ASTM 4140 case hardened?
I would truly appreciate any input!
Is there a better choice than ASTM 4140 case hardened?
I would truly appreciate any input!





RE: Transmission Gears
4140, 4340 and ETD150 are good steels for through hardened gears. The highest performance gears are carburized, case hardened, and ground. 9310 is a better choice for carburized gears. Another excellent steel for carburized gears is 17CrNiMo6 - this steel is more widely used in Europe than in the U.S.
RE: Transmission Gears
Torque, rpm and power all contribute to heat build up and wear rates.
Optimum design depends a lot on the application, which is a detail you omitted.
For instance, Drag racers use soft but tough gears as wear is not an issue, but load bearing shock loads and breakages are.
Heavy duty long haul trucks on the other hand need very good load bearing and wear resistance.
Regards
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RE: Transmission Gears
RE: Transmission Gears
RE: Transmission Gears
Stupidity is the basic building block of the universe. F.Z.
RE: Transmission Gears
RE: Transmission Gears
RE: Transmission Gears
The pressure angle of 20 degree is OK. The 25
degree of pressure angle is alos widely used.
RE: Transmission Gears
RE: Transmission Gears
Aerospace Gear and Spline specialist