Archimedes worm and worm wheel
Transmission of Mul-ti-Head Worm and Worm Wheel
worm and worm wheel mechanism
annular enveloping worm
double enveloping worm gearing
enveloping worm gear pair
Enveloping Worm with Straight Line Generatrix
enveloping worm-gear reducer
Planar Double-Enveloping Worm
Planar double-enveloping worm gearing design
planar quadratic and annular enveloping worm
plane double-enveloping worm gear
toroid enveloping worm with cone generatrix