公开(公告)号：EP3020841A4

公开(公告)日：2017-03-29

申请号：EP14823237

申请日：2014-07-08

申请人： NHK SPRING CO LTD ,  KK KOBE SEIKO SHO (KOBE STEEL LTD ) ,  SHINKO WIRE CO LTD

发明人： YAMAMOTO FUMIO ,  TSURUGAI KENGO ,  YOSHIHARA NAO ,  MASUMOTO KEI ,  OURA HIROSHI ,  JINBO TETSUO ,  MAEHATA TOSHIO ,  YAMAMOTO YOSHIHARU

IPC分类号： C22C38/00 ,  C21D1/06 ,  C21D1/773 ,  C21D6/00 ,  C21D9/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/34 ,  C22C38/46 ,  C22C38/48 ,  C23C8/22

CPC分类号： 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

摘要： 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 (1/4) × diameter in the depth direction from the surface.

公开(公告)号：EP2688096A4

公开(公告)日：2015-04-01

申请号：EP12758031

申请日：2012-03-15

申请人： NHK SPRING CO LTD

发明人： TAKAMURA NORITOSHI ,  MASUDA MICHIYA ,  SASUGA ICHIRO ,  KATO NOBUHARU ,  TSURUGAI KENGO

IPC分类号： H01L23/40 ,  F16F1/12 ,  F16F1/36 ,  H01L23/433 ,  H01L23/473 ,  H01L25/11

CPC分类号： H01L23/40 ,  H01L23/4012 ,  H01L23/433 ,  H01L23/473 ,  H01L25/112 ,  H01L2924/0002 ,  H02M7/003 ,  H02M2001/327 ,  H01L2924/00

公开(公告)号：EP3159572A4

公开(公告)日：2018-04-04

申请号：EP15808893

申请日：2015-06-19

申请人： NHK SPRING CO LTD

发明人： KATO NOBUHARU ,  TSURUGAI KENGO ,  MORIMOTO MASAFUMI

IPC分类号： F16F1/12 ,  F16F1/04 ,  F16F1/06

CPC分类号： F16F1/06 ,  F16F1/042 ,  F16F1/123 ,  F16F1/125

摘要： Provided is a coiled spring assembly, capable of properly engaging a seat for a coiled spring as a seat member with a coiled spring to prevent forced interference between an end turn of the coiled spring and the seat for the coiled spring and increase durability. The coiled spring (3) has an end turn (9) (11) formed up to a first turn with a reduced diameter and a transition portion (13) (15) with a diameter gradually increasing from the end turn (9) (11) to a body portion (7), the seat (5) for the coiled spring has a seat portion (17), a mounting shaft portion (19), and an enlarged diameter portion (21), the mounting shaft portion (19) has an axial length defining a gap or a zero-gap between the enlarged diameter portion (21) of the seat (5) for the coiled spring and the end turn in a free state in which the end turn (9) (11) is fitted to the mounting shaft portion and the bearing surface (9a) (11a) of the end turn (9) (11) is in contact with the receiving surface (17a) of the seat portion (17), and the transition portion (13) (15) circumvents the enlarged diameter portion (21) while the bearing surface (9a) (11a) of the end turn (9) (11) is in contact with the receiving surface (17a) of the seat portion (17).