Inner shaft for extendable and contractible shaft and manufacturing method thereof
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United States of America Patent
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Feb 14, 2017
Grant Date -
Jul 30, 2015
app pub date -
May 23, 2014
filing date -
May 27, 2013
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Abstract
Provided is construction and a manufacturing method of an inner shaft for an extendable and contractible shaft for which finishing for forming a synthetic resin coating layer 19a on the outer-circumferential surface of a male spline section 14b is performed, while at the same time an increase in weight thereof is suppressed. A concave groove 22 that extends in the axial direction is provided on the outer-circumferential surface of the male spline section in a state so as to be continuous in the axial direction with one male spline groove 23 of the male spline grooves 23 of the male spline section 14b. A portion of the concave groove 22 that is separated in the axial direction from the male spline section 14b is used to perform phase alignment of a cutting tool for performing a finishing process of a coating layer 19a and unevenness in the circumferential direction of the male spline section 14b.
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