公开(公告)号：US20160160306A1

公开(公告)日：2016-06-09

申请号：US14903975

申请日：2014-07-08

Applicant: NHK SPRING CO., LTD. ,  KABUSHIKI KAISHA KOBE SEIKO SHO(KOBE STEEL, LTD. ,  SHINKO WIRE CO., LTD.

Inventor： Fumio YAMAMOTO ,  Kengo TSURUGAI ,  Nao YOSHIHARA ,  Kei MASUMOTO ,  Hiroshi OURA ,  Tetsuo JINBO ,  Toshio MAEHATA ,  Yoshiharu YAMAMOTO

IPC: C21D9/02 ,  C21D1/773 ,  C21D6/00 ,  C22C38/46 ,  C22C38/00 ,  C22C38/26 ,  C22C38/24 ,  C22C38/06 ,  C22C38/04 ,  C23C8/22 ,  C22C38/34

CPC classification number: C21D9/02 ,  C21D1/06 ,  C21D1/773 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/00 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/34 ,  C22C38/46 ,  C22C38/48 ,  C23C8/22

Abstract: To provide a coil spring having excellent fatigue resistance.Disclosed is a coil spring made of steel, including (in % by mass, the same shall apply for a chemical composition): C: 0.40 to 0.70%; Si: 1.50 to 3.50%; Mn: 0.30 to 1.50%; Cr: 0.10 to 1.50%; V: 0.50 to 1.00%, and Al: 0.01% or less (excluding 0%), with the balance being iron and inevitable impurities, wherein an average crystal grain size number of prior austenite crystals in a depth of 0.3 mm from a surface is 11.0 or more, while a difference in grain size number between the respective prior austenite crystals is in a range of less than 3 from a grain size number observed at the maximum frequency, and wherein a carburized layer is provided in a depth of 0.30 to 1.00 mm from the surface, while an average Vickers hardness is 600 or higher at a position in a depth of (¼)×diameter in the depth direction from the surface.

Abstract translation: 提供具有优异耐疲劳性的螺旋弹簧。 公开了一种由钢制成的螺旋弹簧，其包含（以质量％计，同样适用于化学成分）：C：0.40〜0.70％ Si：1.50〜3.50％ Mn：0.30〜1.50％ Cr：0.10〜1.50％ V：0.50〜1.00％，Al：0.01％以下（不含0％），余量为铁和不可避免的杂质，其中，与表面相距0.3mm的原奥氏体晶体的平均晶粒数为 11.0以上，而各现有奥氏体晶体之间的晶粒尺寸数差距在最大频率下观察到的晶粒数小于3的范围内，并且其中以0.30〜1.00的深度设置渗碳层 mm，而在从表面的深度方向的深度（¼）×直径的位置，维氏硬度的平均值为600以上。

公开(公告)号：US20170152907A1

公开(公告)日：2017-06-01

申请号：US15320187

申请日：2015-06-19

Applicant: NHK SPRING CO., LTD.

Inventor： Nobuharu KATO ,  Kengo TSURUGAI ,  Masafumi MORIMOTO

IPC: F16F1/06 ,  F16F1/04 ,  F16F1/12

Abstract: Provided is a coiled spring assembly having a coiled spring and a seat for the coiled spring, in which the coiled spring has an end turn formed up to a first turn with a reduced diameter and a transition portion with a diameter gradually increasing from the end turn to a body portion, the seat has a seat portion, a mounting shaft portion, and an enlarged diameter portion, the mounting shaft portion has an axial length defining a gap or a zero-gap between the enlarged diameter portion and the end turn in a free state in which the end turn is fitted to the mounting shaft portion and the bearing surface of the end turn is in contact with the receiving surface of the seat portion, and the transition portion circumvents the enlarged diameter portion while the bearing surface is in contact with the receiving surface.