Rack bar and rack bar teeth forming die
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United States of America Patent
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Apr 19, 2016
Grant Date -
Mar 27, 2014
app pub date -
Jun 20, 2013
filing date -
Jun 21, 2012
priority date (Note) -
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Abstract
A rack bar includes a shaft portion and a rack toothed portion provided on the shaft portion. The rack toothed portion includes a plurality of rack teeth provided side by side in an axial direction of the shaft portion to mesh with a pinion gear. Each of the rack teeth includes a tooth tip portion, a contact face arranged obliquely relative to the axial direction and configured to contact the pinion gear, and a rounded corner portion between the tooth tip portion and the contact face. A first radius defining a central area of the rounded corner portion with respect to a tooth width direction is larger than a second radius defining another area of the rounded corner portion other than the central area.
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