Screw gears (crossed helical gears) - tec-science

Screw gears or crossed helical gears are hyperboloid gears that allow the skew mating of the gear shafts!

Mechanical power transmission Archive - tec-science

Crossed Helical Gears 45º

Screw gears (crossed helical gears) - tec-science

Involute gear - Wikipedia

Worms and worm gears - tec-science

Bevel gears - tec-science

Full article: Lubrication and Wear Analysis of Planetary Roller Screw Mechanism With Threaded Surface Roughness in Thermal Elastohydrodynamic Lubrication

External and internal toothing of gears - tec-science

How to calculate the gear tooth tangential load - Quora

Mechanical power transmission

Screw Gears - QTC Metric Gears

Screw Gear - Ermaksan Gear

Development of Gear Technology and Theory of Gearing

Screw Gears KHK Gear Manufacturer