- published: 01 Jun 2014
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A gear train is formed by mounting gears on a frame so that the teeth of the gears engage. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, this provides a smooth transmission of rotation from one gear to the next.
The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism of Greece and the South Pointing Chariot of China. Illustrations by the renaissance scientist Georgius Agricola show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.
Some important features of gears and gear trains are:
Gear teeth are designed so that the number of teeth on a gear is proportional to the radius of its pitch circle, and so that the pitch circles of meshing gears roll on each other without slipping. The speed ratio for a pair of meshing gears can be computed from ratio of the radii of the pitch circles and the ratio of the number of teeth on each gear.
Yoko Shimomura (下村 陽子, Shimomura Yōko?, born October 19, 1967) is a Japanese video game composer. She has been described as "the most famous female video game music composer in the world". She has worked in the video game music industry since graduating from Osaka College of Music in 1988. From then until 1993, she worked for Capcom, where she composed wholly or in part the scores for 17 games, including Final Fight and Street Fighter II.
From 1993 to 2002 Shimomura worked for Square (now Square Enix), where she composed for a further eight games, including the popular Super Mario RPG, Legend of Mana, and Kingdom Hearts games. Since then she has worked as a freelance composer, writing for over a dozen titles. Her works have gained a great deal of popularity, and have been performed in multiple video game music concerts, including one, Sinfonia Drammatica, that was focused half on her "greatest hits" album, Drammatica: The Very Best of Yoko Shimomura, and half on the music of a previous concert. Music from several of her games has been published as arranged albums and as piano scores.