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Glossary of Terms I-J-K-L A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z ID - inside diameter Idler - a component in a mechanical power transmission system, which simply turns on its shaft without performing any ratio reduction or power transmission, functions. Induction Heat Treating - a process of electrically inducing a magnetic resistance between a work piece and an electrode, causing the work piece to heat rapidly. Quenching (quick cooling) follows the heating process. The final result is a change in the steel's microstructure providing a harder wear surface. Linn Gear Co. has extensive experience with and equipment for hardening its products with this process. Induction hardening allows for hardening teeth only, leaving other areas of a part available for further machining. Involute Profile - The flanks (or sides) of spur, helical, and herringbone gear teeth are generated by hobbing and shaping machines to approximate an involute curve as closely as possible. In simple terms, an involute curve can be created by tying a pencil to the end of a string and wrapping the string around a cylinder. Hold tension in the string as you unwind it from the cylinder. The curve drawn by the pencil as it moves out from the cylinder is an involute curve. The closeness with which the involute profile of an actual gear tooth approximates a theoretically perfect involute curve is one defining element of the quality of a gear. KW or KWY - keyway Keyless Shaft/Hub Connectors - devices designed to attach power transmission components such as gears or sprockets to shafts using expansion and compression forces between the bore and shaft. Linn Gear Co. recommends the B-Loc brand. Keyway - a slot cut into both the bore of a sprocket or gear and the shaft onto which the part will be mounted. A square, steel `key' (straight or tapered) is inserted between the shaft and the sprocket or gear, allowing power to be transmitted between the two components. LTB - length through bore Lead - is the axial advance of a helix for one complete turn, as in the threads of cylinder worms and teeth of helical gears. Length Through Bore - describes the overall width of a sprocket or gear measured axially at the center hole. Lightener Holes - are holes cut into the rim or web of larger sprockets and gears to reduce their weight, without reducing load carrying capacity. Lightener holes reduce shaft loads and shipping costs. LSB Sprocket - a sprocket cut to run on the HTD® belts manufactured by the Gates Rubber Co. |