das Schneckengetriebe

1. 1

   worm drive, worm and wheel — gear arrangement consisting of a screw (the worm) whose thread meshes with a gear wheel to turn the direction of drive through a right angle, typically with a large (1:10 to 1:60) speed reduction and similar torque increase

Forms in lighter type are derived by the standard declension rules from the nominative, genitive and plural.