Electric power steering system
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United States of America Patent
Stats
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Feb 28, 2017
Grant Date -
Jan 14, 2016
app pub date -
Jun 30, 2015
filing date -
Jul 9, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric power steering system includes an electric motor and a worm speed reducer. The worm speed reducer includes a worm shaft, a worm wheel, and a ring member. The worm wheel includes an annular tooth portion and an annular support formed of a material that is softer than a material of a shaft. The ring member includes an outer periphery press-fitted with the annular support so as to form plastically deformed portions in part of the annular support, and an inner periphery with which the shaft is press-fitted. The ring member is formed of a material with a hardness equivalent to a hardness of the material of the shaft.
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