To provide a worm reduction gear capable of restraining degradation in sealing performance by a cover even when a temperature change occurs, without increasing the number of components.SOLUTION: Linear coefficients of expansion of a material constituting a worm housing part 24 and a material constituting a cover 22d are made different from each other. An outer cylindrical part 46a constituting the cover 22d is loosely-fitted onto a cover mounting-side end part 29a constituting the worm housing part 24, and an inner cylindrical part 49a constituting the cover 22d is tightly-fitted into a cover mounting-side end part 29a.SELECTED DRAWING: Figure 13
【課題】部品点数を増加させることなく、温度変化が生じた場合にも、カバーによる封止性能が低下することを抑制できる、ウォーム減速機の構造を提供する。【解決手段】ウォーム収容部24を構成する材料の線膨張係数と、カバー22dを構成する材料の線膨張係数とを、互いに異ならせる。カバー22dを構成する外側筒部46aを、ウォーム収容部24を構成するカバー装着側端部29aに隙間嵌めで外嵌し、かつ、カバー22dを構成する内側筒部49aを、カバー装着側端部29aに締り嵌めで内嵌する。【選択図】図13
WORM REDUCTION GEAR
ウォーム減速機
2019-11-28
Patent
Electronic Resource
Japanese
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