Manufacturing method for hollow rack bar and hollow rack bar manufacturing apparatus
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United States of America Patent
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May 14, 2024
Grant Date -
Sep 3, 2020
app pub date -
Nov 15, 2018
filing date -
Nov 21, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A manufacturing method is provided for a hollow rack bar made of a hollow shaft material and including a toothed section which has a rack on an outer surface and a shaft section which is thinner than the toothed section. The manufacturing method includes: (i) drawing the hollow shaft material using a die and a plug, and preforming regions of the hollow shaft material including a toothed section formation region configured to become the toothed section and a shaft section formation region configured to become the shaft section so as to have thicknesses according to the respective regions; and (ii) forming the rack at the toothed section formation region of the hollow shaft material which is preformed.
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