| 摘要 |
#CMT# #/CMT# The plug has an insulator (2) arranged in a body (1) that is made of base metallic materials, and an earth electrode (4) emanating from the body. A molded part (6) is welded to the earth electrode and is turned towards a central electrode (3), where the molded part is made from a set of noble metals. A spacer (9) is provided between the molded part and the earth electrode and is welded to the molded part and the earth electrode. The spacer is formed as a socket and has a thermal expansion co-efficient, which differs from the thermal expansion co-efficient of the earth electrode. #CMT# : #/CMT# An independent claim is also included for a method for reinforcing an earth electrode. #CMT#USE : #/CMT# Spark plug. #CMT#ADVANTAGE : #/CMT# The molded part made of noble metals is welded to the earth electrode, and the thermal expansion co-efficient of the spacer differs from the thermal expansion co-efficient of the earth electrode, which emanates from the body made of base metallic materials, thus reducing thermal stress in a connecting zone between the earth electrode and the spacer, and hence avoiding detachment of the spacer from the earth electrode. The spark plug thus avoids cracks in the connecting zone, and hence increasing service life of the spark plug. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a diagonal, perspective view of a tip of a spark plug. 1 : Body 2 : Insulator 3 : Central electrode 4 : Earth electrode 6 : Molded part 9 : Spacer #CMT#INORGANIC CHEMISTRY : #/CMT# The molded part is made of platinum or platinum-base alloy that consists of a set of elements such as iridium, rhodium, ruthenium, palladium, tungsten, nickel and osmium, and of iridium or iridium-base alloy that consists of a set of elements such as rhodium, platinum, nickel, chromium, palladium and rhenium. The molded part contains oxides of elements such as zirconium, yttrium, hafnium, cerium, titanium, magnesium, barium and lanthanum. |
