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Strain wave gearing is a special type of mechanical gear system that can improve certain characteristics compared to traditional gearing systems such as helical gears or planetary gears. It was invented in 1957 by C.W. Musser while he was a research advisor at United Shoe Machinery (USM). The advantages include: no backlash, compactness and light weight, high gear ratios, reconfigurable ratios within a standard housing, good resolution and excellent repeatability when repositioning inertial loads, high torque capability, and coaxial input and output shafts. High gear reduction ratios are possible in a small volume (a ratio from 30:1 up to 320:1 is possible in the same space in which planetary gears typically only produce a 10:1 ratio). Disadvantages include a tendency for 'wind-up' (a torsional spring rate) in the low torque region. Strain wave gears are typically used in industrial motion control, machine tool, printing machine, robotics and aerospace, for gear reduction but may also be used to increase rotational speed, or for differential gearing. ==History== The basic concept of strain wave gearing (SWG) was introduced by C.W. Musser in his 1955 patent while he was an advisor at United Shoe Machinery Corporation (USM). The electrically-driven wheels of the Apollo Lunar Rover included strain wave gears. Also, the winches used on Skylab to deploy the solar panels were powered using strain wave gears. Both of these system were developed by The Harmonic Drive division of United Shoe Machinery Corp.(needed ) The most notable manufacturers using this gear technology is the Harmonic Drive group of companies located in Japan, USA and Germany.〔http://www.harmonicdrive.com〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Strain wave gearing」の詳細全文を読む スポンサード リンク
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