Vertical motion impeller-type shot peening device and coil spring
AssigneeNHK Spring Co., Ltd.
InventorsSenri Moriyama, Satoshi Akiyama, Masaya Komazaki, Go Nagayasu, Hideki Okada, Daisuke Yokota
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Abstract
A coil spring includes a helically formed wire having end turn portions at ends thereof, a plurality of first rough surfaces, each including first shot peening indentations formed on a part of a surface of the end turn portions, and a second rough surface including second shot peening indentations formed on the entire surface of the wire except for the first rough surface. The second rough surface has a surface roughness different from that of the first rough surface.
Claims5
A coil spring comprising a helically formed wire and having end turn portions at ends thereof, the coil spring comprising:
- a plurality of first rough surfaces, each including first shot peening indentations formed on a part of a surface of the end turn portions;
- and
- a second rough surface including second shot peening indentations formed on the entire surface of the wire except for the first rough surface, the second rough surface having a surface roughness different from that of the first rough surface.
Dependencies are inferred from the claim text.