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A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm wheel (which is similar in appearance to a spur gear). Its main purpose is to translate the motion of two perpendicular axes or to translate circular motion to linear motion (example: band type hose clamp ).The two elements are also ...
fig.1. A duplex worm or dual lead worm is a worm gear set where the two flanks are manufactured with slightly different modules and/or diameter quotients. As a result of this, different lead angles on both tooth profiles are obtained, so that the tooth thickness is continuously increasing all over the worm length, while the gap between two threads is decreasing.
Dynamic loads on gear teeth. American society of Mechanical Engineers, New York, 1931. Dimensions and tolerances for mass production. Industrial Press, New York, 1954. Design of worm and spiral gears: A manual for the design and manufacture of all-recess-action worm and spiral gear drives. Industrial Press, New York, c.1960. (With Henry H. Ryffel)
A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.
The main scientific developments of Prof. V.I. Goldfarb consisted of the classification and study of spatial gear schemes, rational structuring of the process of computer-aided design of worm gears, the development of a "non-differential" method for finding surfaces formed by enveloping, and the study of a variety of spiroid gears.
The worm gear is similar in design to a ball screw; the threads are filled with steel balls that recirculate through the gear and rack as it turns.The balls serve to reduce friction and wear in the gear, and reduce slop.
The slewing drive is a modernized take on the worm drive mechanism, which dates back many centuries and was widely used during the Renaissance Era. Pappus of Alexandria (3rd century AD), a Greek mathematician, is credited with an early version of the endless screw, which would later evolve into the worm drive. [1]
In 1913, they established a joint venture in America with Timken for Radicon worm drive units. By the end of World War I the workforce had increased from 200 to 1,000 as they started building propulsion units for warships, and drive mechanisms for armaments. By 1921 the company was the largest worm gear manufacturer in the world. [2]
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