A Worm Shaft is a cylindrical mechanical shaft that contains a worm gear and transmits rotational motion and power to a worm wheel. The worm is a screw-like gear with helical teeth created around the shaft that engage with the teeth of the worm wheel. When the worm shaft rotates, its helical threads press against the teeth of the worm wheel, turning the shaft's high-speed rotating action into a slower, higher-torque motion. Worm-drive shafts are often positioned at a 90-degree angle to one another.
A worm shaft is commonly made of carbon steel, alloy steel, or hardened steel, depending on the needed load, speed, and working circumstances. Important characteristics include the worm shape, pitch, lead angle, shaft diameter, bearing seats, keyways, threads, and overall dimensional precision.
The worm surface is frequently toughened or carefully polished to increase wear resistance and service life. Because the worm and worm wheel have extensive sliding contact, precise machining and alignment are required. Proper lubrication is also essential to prevent friction, heat production, and tooth wear.
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