Hollow coil spring and suspension device for vehicle
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United States of America Patent
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Jun 27, 2023
Grant Date -
Feb 10, 2022
app pub date -
Oct 26, 2021
filing date -
Mar 30, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A method of manufacturing a hollow coil spring which is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.
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