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US 2025/0320902 A1Published application
Coil spring and manufacturing method of the same
AssigneeNHK Spring Co., Ltd.
InventorsKeita TAKAHASHI, Satoshi OKABE, Yoshinobu MINO, Shintaro KUMAI, Tohru SHIRAISHI
Life of this patent
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Abstract
According to an embodiment, a coil spring is formed of a wire wound into a helical shape, and at least part of the wire has a hardness distribution varying in a circumferential direction around an axis of the wire.
Claims12
A coil spring formed of a wire wound into a helical shape, wherein
- at least part of the wire has a hardness distribution varying in a circumferential direction around an axis of the wire.
Dependencies are inferred from the claim text.