(19)
(11) EP 2 078 831 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.08.2011 Bulletin 2011/34

(43) Date of publication A2:
15.07.2009 Bulletin 2009/29

(21) Application number: 09150266.6

(22) Date of filing: 09.01.2009
(51) International Patent Classification (IPC): 
F01L 1/053(2006.01)
 F01L 1/18(2006.01)
(84) Designated Contracting States:
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 SE SI SK TR
Designated Extension States:
AL BA RS

(30) Priority: 09.01.2008 US 19936

(71) Applicant: Roller Bearing Company of America, Inc.
Oxford, CT 06478 (US)

(72) Inventors:
  • Lugosi, Robert
    Oxford, CT 06478 (US)
  • Parkinson, Steve
    Lakeville, IN 46536 (US)
  • Prescavage, James
    Hainesport, NJ 08036 (US)

(74) Representative: Israelsson, Stefan 
Bjerkéns Patentbyrå KB P.O. Box 5366
102 49 Stockholm
102 49 Stockholm (SE)

   


(54) Surface treated rocker arm shaft


(57) A shaft (2, 19, 24, 124, 224) for a rocker arm assembly (1, 20, 120, 220) is disclosed. The shaft includes a substantially cylindrical outer surface (26, 126, 226) at least a portion (29, 129, 229) of which defines a bearing surface (28, 128, 228) thereon and an interior core portion (32, 132, 232) located radially inward of the bearing surface. The bearing surface (28, 128, 228) has a hardness greater than that of the core portion (32, 132, 232), for providing wear resistance and deterring crack initiation and propagation.







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