Basic structure and working principle of worm gear
2025-06-30
Structural Composition
The worm wheel, as the larger gear in an intersecting axis gear pair, meshes with the worm (a spiral-like active member). Its pitch surface can be a cylindrical surface, a conical surface, or a toroidal surface; a cylindrical worm wheel is common.
The worm wheel teeth envelop the worm; during meshing, they exhibit line contact, resulting in higher load-bearing capacity than point contact intersecting axis helical gear mechanisms.
Working Principle
When the worm rotates, it drives the worm wheel tooth surface to slide and roll via the helical surface, thus achieving motion transmission. A single-start worm rotates one revolution for each tooth of the worm wheel; a multi-start worm rotates one revolution for multiple teeth of the worm wheel.
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