| 摘要 |
A flat type wave gear device is realized having a much improved load capacity. When d is an amount of radial flexing at a major axis location of a rim neutral circle of the flexible external gear of a flat type wave gear device flexed into an elliptical shape and t is the rim thickness of the flexible external gear, then <?in-line-formulae description="In-line Formulae" end="lead"?>(0.5237 Ln(R)-1.32)d<=T<=(0.8728 LN(R)-2.2)d <?in-line-formulae description="In-line Formulae" end="tail"?> when the reduction ratio R of the wave gear device is less than 80, and <?in-line-formulae description="In-line Formulae" end="lead"?>(1.5499 Ln(R)-5.8099)d<=T<=(2.5832 LN(R)-9.6832)d <?in-line-formulae description="In-line Formulae" end="tail"?> when the reduction ratio R of the wave gear device is 80 or more. Using this setting makes it possible to increase the tooth root fatigue limit strength of the flexible external gear, thereby making it possible to improve the load capacity of the flexible external gear.
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