(19)
(11) EP 1 329 727 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
08.10.2003 Bulletin 2003/41

(43) Date of publication:
23.07.2003 Bulletin 2003/30

(21) Application number: 02023216.1

(22) Date of filing: 16.10.2002
(51) International Patent Classification (IPC)7: G01P 3/44, G01P 21/02, G08C 17/02, B60C 23/00
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 18.10.2001 JP 2001320629
12.11.2001 JP 2001346521
21.11.2001 JP 2001356399
21.11.2001 JP 2001356076
08.07.2002 JP 2002198703

(71) Applicant: NSK LTD
Shinagawa-ku, Tokyo (JP)

(72) Inventors:
  • Morita, Kouichi, c/o NSK Ltd.
    Fujisawa-shi, Kanagawa-ken (JP)
  • Sakatani, Ikunori, c/o NSK Ltd.
    Fujisawa-shi, Kanagawa-ken (JP)
  • Endo, Shigeru, c/o NSK Ltd.
    Fujisawa-shi, Kanagawa-ken (JP)
  • Miyazaki, Hiroya, c/o NSK Ltd.
    Fujisawa-shi, Kanagawa-ken (JP)
  • Sakamoto, Junshi, c/o NSK Ltd.
    Fujisawa-shi, Kanagawa-ken (JP)
  • Nakamura, Yuji, c/o NSK Ltd.
    Fujisawa-shi, Kanagawa-ken (JP)

(74) Representative: Brown, John David 
FORRESTER & BOEHMERT Pettenkoferstrasse 20-22
80336 München
80336 München (DE)

   


(54) Rotation-speed sensor device


(57) A rotation-speed sensor device is provided to comprise an encoder supported by a rotating race of a rolling bearing unit for vehicle wheel support to be concentric with the rotating race and having a detected portion the characteristics of which are alternately changed in a circumferential direction, a rotation detection sensor supported by a non-rotating member on the vehicle chassis side and having a detecting portion facing the detected portion to produce a detection signal, a wireless transmission device for sending the detection signal from the rotation detection sensor to a controller provided on the vehicle chassis side, and a self-diagnosis circuit to judge whether there is an error or not in the rotation detection sensor.