According to an embodiment, a coil spring is formed of a wire wound in a helical shape, and includes an end turn portion and an effective portion. A surface of the wire in the end turn portion has a first area and a second area softer than the first area. Further, in a circumferential direction around an axis of the wire, the second area is formed over a range wider than that of the first area.
COIL SPRING, SUSPENSION DEVICE, AND COIL SPRING MANUFACTURING METHOD
2025-07-17
Patent
Electronic Resource
English
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