Screw shaft and method for producing same, and electric position-adjusting device for steering wheel
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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May 7, 2024
Grant Date -
Dec 21, 2023
app pub date -
Oct 11, 2021
filing date -
Oct 13, 2020
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Provided is a screw shaft in which shape accuracy of a male threaded portion is sufficiently secured. A screw shaft includes a large-diameter shaft portion, medium-diameter shaft portions and small-diameter shaft portions. The large-diameter shaft portion has a male threaded portion along its entire axial length on its outer peripheral surface. The medium-diameter shaft portions are arranged axially adjacent to the large-diameter shaft portion and have an outer diameter smaller than an outer diameter of the large-diameter shaft portion. The small-diameter shaft portions are axially arranged adjacent to the medium-diameter shaft portions on sides opposite to the large-diameter shaft portion, have an outer diameter smaller than the outer diameter of each of the medium-diameter shaft portions, and do not have rolling traces having a helical shape on their outer peripheral surfaces.
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