Global Patent Index - EP 0718410 B1

EP 0718410 B1 2001-03-28 - Process for producing rocker arms

Title (en)

Process for producing rocker arms

Title (de)

Verfahren zum Herstellen von Kipphebeln

Title (fr)

Procédé pour la fabrication de leviers oscillants

Publication

EP 0718410 B1 (EN)

Application

EP 94309203 A

Priority

  • EP 94309203 A
  • JP 24959593 A

Abstract (en)

[origin: EP0718410A1] In producing a rocker arm (25, 26), the following steps are used: fabricating a rocker arm blank (79) which includes: a rocker arm body (77) having an aperture (36a) therein adapted to be converted to a hole (36) for the insertion of a shaft (24), and which blank (79) is made of a nitrided steel comprising specified amounts of C, Mn, Cr, Al, Si, P, S, Cu, Ni, one of Pb and Bi, and optionally Mo, and, as the balance, substantially Fe; and a slipper surface forming piece (41); subjecting the rocker arm blank (79) to a refining treatment to adjust its hardness; subjecting the apertures (36a) to reaming to form the shaft insertion holes (36); and subjecting the rocker arm blank (79) with the shaft insertion holes (36) formed therein to a nitriding treatment. Thus, it is possible to mass-produce rocker arms (25, 26) for an internal combustion engine, each of which has excellent mechanical properties. <IMAGE>

IPC 1-7 (main, further and additional classification)

C21D 1/78; C21D 9/00

IPC 8 full level (invention and additional information)

C21D 1/78 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C23C 8/26 (2006.01); F01L 1/18 (2006.01); F01L 1/26 (2006.01); C21D 1/18 (2006.01)

CPC (invention and additional information)

C21D 9/0068 (2013.01); C21D 1/78 (2013.01); F01L 1/181 (2013.01); F01L 1/267 (2013.01); C21D 1/18 (2013.01); F01L 2103/00 (2013.01)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family

EP 0718410 A1 19960626; EP 0718410 B1 20010328; JP 3411637 B2 20030603; JP H07102322 A 19950418