公开(公告)号：US20240077123A1

公开(公告)日：2024-03-07

申请号：US17754667

申请日：2020-10-15

Applicant: NIPPON STEEL CORPORATION ,  NHK SPRING CO., LTD. ,  NIPPON STEEL SG WIRE CO., LTD.

Inventor： Shinya TERAMOTO ,  Yutaka NEISHI ,  Michimasa AONO ,  Shuji KOZAWA ,  Fumio TAKAHASHI ,  Shigekazu NISHIMOTO ,  Mitsuhiro KONDO ,  Tatsuro OCHI ,  Shoichi SUZUKI

IPC: F16F1/02 ,  C21D1/18 ,  C21D1/30 ,  C21D6/00 ,  C21D8/00 ,  C21D9/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C23C8/26

CPC classification number: F16F1/021 ,  C21D1/18 ,  C21D1/30 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D9/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C23C8/26 ,  C22C2202/02 ,  F16F2224/02

Abstract: A valve spring includes a nitrided layer, and a core portion that is further inward than the nitrided layer. A 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%, Ca: 0.0001 to 0.0050%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, and N: 0.0070% or less, 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 per μm2, and in the core portion, a numerical proportion of Ca sulfides with respect to a total number of oxide-based inclusions and sulfide-based inclusions is 0.20% or less.

公开(公告)号：US20230296152A1

公开(公告)日：2023-09-21

申请号：US17754566

申请日：2020-10-15

Applicant: NIPPON STEEL CORPORATION ,  AISIN CORPORATION ,  NHK SPRING CO., LTD. ,  NIPPON STEEL SG WIRE CO., LTD.

Inventor： Shinya TERAMOTO ,  Yutaka NEISHI ,  Michimasa AONO ,  Shuji KOZAWA ,  Yoichi OI ,  Naoki TAKABAYASHI ,  Junji TANAKA ,  Fumio TAKAHASHI ,  Shigekazu NISHIMOTO ,  Mitsuhiro KONDO ,  Tatsuro OCHI ,  Shoichi SUZUKI

IPC: F16F1/02 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46 ,  C21D9/02 ,  C21D8/06 ,  C21D6/00 ,  C21D1/06 ,  C21D1/30 ,  C23C8/26 ,  F16F1/04

CPC classification number: F16F1/021 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C22C38/46 ,  C21D9/02 ,  C21D8/065 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D1/06 ,  C21D1/30 ,  C23C8/26 ,  F16F1/04 ,  C21D2211/008 ,  F16F2224/0208

Abstract: 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, 5: 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.

公开(公告)号：US20190113094A1

公开(公告)日：2019-04-18

申请号：US16088665

申请日：2017-03-30

Applicant: NHK SPRING Co., Ltd.

Inventor： Toshinori WATANABE ,  Hidemasa ITO ,  Noritoshi TAKAMURA ,  Fumio YAMAMOTO ,  Fumio TAKAHASHI

IPC: F16F1/04 ,  F16F1/06

Abstract: The present invention provides a coil spring, in which a corresponding portion is provided at an end portion in a direction of a coil axis, the corresponding portion having a whole size in the direction of the coil axis of the plurality of wire materials adjacent to each other in the direction of the coil axis equal to a maximum value of a gap in the direction of the coil axis between wire materials adjacent to each other in the direction of the coil axis of the coil spring, a gap in the direction of the coil axis between the corresponding portion and a wire material adjacent to the corresponding portion on an inner side in the direction of the coil axis is smaller than a wire height in an active coil portion of the coil spring, and at the end portion of the direction of the coil axis, a gap in the direction of the coil axis between a portion extending around the coil axis from the corresponding portion to a distal end portion side of the wire material and a wire material adjacent to the portion on the inner side in the direction of the coil axis gradually decreases from the corresponding portion toward the distal end portion side of the wire material around the coil axis.