Blank and method of manufacturing rack shaft using the same
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United States of America Patent
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Nov 15, 2016
Grant Date -
Jan 1, 2015
app pub date -
Jun 9, 2014
filing date -
Jul 1, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A blank is provided with a first shaft portion, a second shaft portion, and a machining target portion. The machining target portion is formed at a position closer to a shaft end portion of the first shaft portion than a shaft end portion of the second shaft portion. A first large-volume portion is formed at the first end portion of the machining target portion close to the first shaft portion, and a second large-volume portion is formed at the second end portion of the machining target portion close to the second shaft portion, respectively. The volumes per unit length of the first and second large-volume portions are greater than the volume per unit length of the intermediate portion in the axial direction of the machining target portion. Furthermore, the volume of the second large-volume portion is greater than the overall volume of the first large-volume portion.
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