Global Patent Index - EP 1171640 A2

EP 1171640 A2 20020116 - METHOD AND DEVICE FOR HARDENING SURFACES OF A CRANKSHAFT OR CAMSHAFT

Title (en)

METHOD AND DEVICE FOR HARDENING SURFACES OF A CRANKSHAFT OR CAMSHAFT

Title (de)

VERFAHREN UND VORRICHTUNG ZUM HÄRTEN VON FLÄCHEN EINER KURBEL- ODER NOCKENWELLE

Title (fr)

PROCEDE ET DISPOSITIF POUR DURCIR DES SURFACES DE VILEBREQUIN OU D'ARBRE A CAMES

Publication

EP 1171640 A2 20020116 (DE)

Application

EP 00926920 A 20000413

Priority

  • DE 19917241 A 19990416
  • DE 19955670 A 19991119
  • EP 0003354 W 20000413

Abstract (en)

[origin: WO0063447A2] The invention relates to a method and device for hardening surfaces (10, 11, 12; 39, 40, 41) of a crankshaft (K) or camshaft (N), said surfaces being adjacently arranged in axis direction (A). According to the invention, the surfaces (10, 11, 12; 39, 40, 41) to be hardened are inductively heated by an inductor (14, 15, 16; 33, 34, 35) individually allocated thereto and are quenched after heating, whereby at least two adjacently arranged surfaces (10, 11, 12; 39, 40, 41) to be hardened are simultaneously heated. The aim of the invention is to make it possible to simultaneously harden closely adjacent surfaces while decreasing the risk of a defective hardening. To this end, the invention provides that, during simultaneous heating of the surfaces (10, 11, 12; 39, 40, 41) to be hardened, the inductor (14, 15, 16; 33, 34, 35) that is individually allocated to one of the surfaces (10, 11, 12; 39, 40, 41) is operated with a frequency (F1, F2; F3, F4) that differs from that of the inductor (10, 11, 12; 39, 40, 41) allocated to the immediately adjacent surface (10, 11, 12; 39, 40, 41) to be hardened.

IPC 1-7

C21D 1/10; C21D 9/30

IPC 8 full level

F01L 1/04 (2006.01); C21D 1/10 (2006.01); C21D 9/30 (2006.01); F16C 3/02 (2006.01); F16C 3/06 (2006.01); F16H 53/02 (2006.01)

CPC (source: EP)

C21D 1/10 (2013.01); C21D 9/30 (2013.01); Y02P 10/25 (2015.11)

Citation (search report)

See references of WO 0063447A3

Designated contracting state (EPC)

DE ES FR IE IT

DOCDB simple family (publication)

WO 0063447 A2 20001026; WO 0063447 A3 20010329; BR 0009812 A 20020319; EP 1171640 A2 20020116; JP 2002542434 A 20021210

DOCDB simple family (application)

EP 0003354 W 20000413; BR 0009812 A 20000413; EP 00926920 A 20000413; JP 2000612522 A 20000413