(19)
(11) EP 2 756 971 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
10.12.2014 Bulletin 2014/50

(88) Date of publication A3:
23.07.2014 Bulletin 2014/30

(43) Date of publication:
23.07.2014 Bulletin 2014/30

(21) Application number: 12831876.3

(22) Date of filing: 23.04.2012
(51) International Patent Classification (IPC): 
B60G 9/04(2006.01)
C21D 1/18(2006.01)
F16F 1/14(2006.01)
 C21D 1/09(2006.01)
C21D 9/08(2006.01)
(86) International application number:
PCT/JP2012/002781
(87) International publication number:
WO 2013/038580 (21.03.2013 Gazette 2013/12)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 14.09.2011 JP 2011200297

(71) Applicants:
  • Y-TEC CORPORATION
    Aki-gun Hiroshima 763-0003 (JP)
  • FUJI GIKEN CO., LTD.
    Aichi 470-0371 (JP)

(72) Inventors:
  • EDAHIRO, Takeshi
    Aki-gun Hiroshima 736-0003 (JP)
  • AKUTAGAWA, Norifumi
    Aki-gun Hiroshima 736-0003 (JP)
  • YAMANE, Kyotaro
    Aki-gun Hiroshima 736-0003 (JP)
  • HIRAOKA, Teruhisa
    Aki-gun Hiroshima 736-0003 (JP)
  • YASUDA, Kazumi
    Aki-gun Hiroshima 736-0003 (JP)
  • ANDO, Shigeaki
    Toyota-shi Aichi 470-0371 (JP)
  • HASHIMOTO, Masaru
    Toyota-shi Aichi 470-0371 (JP)
  • ANDO, Yuichi
    Toyota-shi Aichi 470-0371 (JP)
  • TSURUTA, Tetsuya
    Toyota-shi Aichi 470-0371 (JP)

(74) Representative: BRP Renaud & Partner mbB Rechtsanwälte Patentanwälte Steuerberater 
Königstraße 28
70173 Stuttgart
70173 Stuttgart (DE)

   


(54) HOLLOW MEMBER AND METHOD FOR MANUFACTURING HOLLOW MEMBER


(57) A tubular hollow member to which torsion about a center line is applied is characterized in performing a partial heat treatment on part of a peripheral wall of the hollow member to make the hardness of an outer portion of the peripheral wall greater than the hardness before heating and greater than the hardness of an inner portion of the peripheral wall, and reduce a residual stress of the inner portion of the peripheral wall.