Title:
【発明の名称】点火栓の電極の製法及び点火栓電極
Document Type and Number:
Japanese Patent JPH05502751
Kind Code:
A
Abstract:
PCT No. PCT/DE90/00864 Sec. 371 Date May 8, 1992 Sec. 102(e) Date May 8, 1992 PCT Filed Nov. 13, 1990 PCT Pub. No. WO91/09438 PCT Pub. Date Jun. 27, 1991.The invention relates to a method for producing a longlife, resistant spark plug for internal combustion engines. The electrode (16), according to the invention, of the spark plug is assembled from a plurality of initial parts: an initial part for a corrosion-resistant shell (31'), an initial part for a core (33') of high thermal conductivity, and an initial part for an erosion-resistant region (32'). These initial parts are jointly impact-extruded to form an electrode blank which is formed into the center electrode (16) by machining its head (51) and its region on the combustion-chamber side. Electrodes which are especially highly stressed are given a fourth initial part, which is also to be impact-extruded, consists of highly erosion-resistant material and is still arranged on the combustion-chamber side in front of the erosion-resistant region (32'). The electrode (16) can be used as a center electrode (16), but can also be used, if necessary, as an earth electrode after an embossing and bending process.
Inventors:
Triber, Jurgen
Noack, liner
Paul, Claus-Dieter
Frank, Villi
Blendic Volker
Hobart, Hans
Noack, liner
Paul, Claus-Dieter
Frank, Villi
Blendic Volker
Hobart, Hans
Application Number:
JP51511790A
Publication Date:
May 13, 1993
Filing Date:
November 13, 1990
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
B21C23/22; H01T13/20; H01T13/39; H01T21/02; (IPC1-7): B21C23/22; H01T21/02
Attorney, Agent or Firm:
Toshio Yano (2 outside)