Damper spring

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12181012
APP PUB NO 20230296152A1
SERIAL NO

17754566

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Abstract

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A damper spring having an excellent fatigue limit is provided. A damper spring according to the present embodiment includes a nitrided layer formed in an outer layer, and a core portion that is further inward than the nitrided layer. The chemical composition of the core portion consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/μm2.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 1008071 ?1008071
NHK SPRING CO LTD3-10 FUKUURA KANAZAWA-KU YOKOHAMA-SHI KANAGAWA 236-0004
AISIN CORPORATION2-1 ASAHI-MACHI KARIYA AICHI 448-8650
NIPPON STEEL SG WIRE CO LTD1-9-1 MARUNOUCHI CHIYODA-KU TOKYO 100-0005

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aono, Michimasa Tokyo, JP 7 3
Kondo, Mitsuhiro Yokohama, JP 33 740
Kozawa, Shuji Tokyo, JP 24 115
Neishi, Yutaka Tokyo, JP 56 65
Nishimoto, Shigekazu Yokohama, JP 3 16
Ochi, Tatsuro Tokyo, JP 32 182
Oi, Yoichi Kariya, JP 42 147
Suzuki, Shoichi Tokyo, JP 628 6863
Takabayashi, Naoki Kariya, JP 15 138
Takahashi, Fumio Yokohama, JP 103 927
Tanaka, Junji Kariya, JP 85 750
Teramoto, Shinya Tokyo, JP 28 24

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