Spline telescopic shaft, method for manufacturing spline telescopic shaft, and vehicle steering apparatus
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United States of America Patent
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Apr 16, 2013
Grant Date -
Feb 10, 2011
app pub date -
Jul 30, 2010
filing date -
Aug 7, 2009
priority date (Note) -
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Abstract
A spline telescopic shaft includes an inner shaft having an outer tooth surface, and a cylindrical outer shaft having an inner tooth surface and arranged to fit to the inner shaft slidably in an axial direction of the inner shaft. Either one of the outer tooth surface and the inner tooth surface includes a first resin coating. The other of the outer tooth surface and the inner tooth surface includes a second resin coating. The second resin coating is formed by processing for sliding an intermediate member for manufacturing the inner shaft and an intermediate member for manufacturing the outer shaft in the axial direction, to transfer a part of a resin material provided in the intermediate member for manufacturing the shaft including the one tooth surface for forming the first resin coating to the intermediate member for manufacturing the shaft including the other tooth surface.
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