Unlock instant, AI-driven research and patent intelligence for your innovation.

Spark plug

A technology of spark plug and spark discharge, which is applied in the direction of spark plugs, electrical components, circuits, etc., and can solve problems such as insufficient melting

Inactive Publication Date: 2003-05-14
NGK SPARK PLUG CO LTD
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the research of the inventors of the present invention, it has been found that the essential cause is not that the melting is insufficient.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Spark plug
  • Spark plug
  • Spark plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A noble metal sheet for forming the noble metal wear-resistant portion of the ground electrode was fabricated as follows. First, Pt-Pd-Ru alloys and Pt-Pd alloy ingots having various compositions were prepared by mixing and dissolving 10 mass % of Pd and 0 to 20 mass % of Ru in a predetermined amount of Pt. The alloy is hot-forged at 1500°C, then hot-rolled and hot-formed at 1300°C, and then hot-drawn at 1200°C to obtain alloy wires with a diameter of 0.5-1.6mm. By cutting it in the longitudinal direction, a disk-shaped piece having a diameter of 0.5 to 1.6 mm and a thickness of 0.4 mm was obtained. Use these pieces, and then resistance weld them to the side surface (2.7mm wide) of the ground electrode base material made of Inconel alloy 601, and it is completed. figure 1 (b) The joint structure of the ground electrode of the shown form. The conditions for resistance welding were energizing current value 900A and pressurized load 2.45MPa.

[0039] In order to measure...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

A spark plug is provided which, even when the ground electrode base material is a heat resistant alloy having an increased amount of a component with improved corrosion resistance such as Cr or Al, can fully ensure peeling resistance of a noble metal wear resistant portion joined to the ground electrode base material and, accordingly, can be used reliably over a long period of time even under a severe use environment. In the spark plug (100), at least one side face of the ground electrode (4) is made of an electrode base material comprising an Ni alloy containing 21-25% by mass of Cr, 1-2% by mass of Al, 7-20% by mass of Fe and 58-71% by mass of Ni. The noble metal wear resistant portion (32) is joined to the electrode base material via a welding portion (W). When linear expansion coefficients at 800 K of noble metal constituting the noble metal wear resistant portion (32) and the electrode base material are represented by alpha 1 and alpha 2 respectively, DELTA alpha IDENTICAL alpha 2- alpha 1 is adjusted to be 4.55x10<-6> / K or less. The outer diameter of the noble material wear resistant portion (32) is made to be 0.6 mm to 1.5 mm.

Description

technical field [0001] The invention relates to a spark plug for an internal combustion engine. Background technique [0002] In general, in the above-mentioned spark plug, in order to improve the spark wear resistance, there are many proposals to form a wear-resistant portion by welding a noble metal piece mainly composed of Pt or Ir to the tip of the electrode. In particular, the wear-resistant part of the center electrode, which is often set to negative polarity during spark discharge, is easily worn due to the strong attack of sparks, so research on noble metallization has been developed. [0003] On the other hand, in recent years, with the stringent exhaust regulations of internal combustion engines, the lean burn seen in direct injection engines has been developed. In addition, in order to obtain the best combustion, the spark discharge gap of the spark plug is set to a ratio Structures that protrude further into the combustion chamber in the past. As a result, the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/32H01T13/39
CPCH01T13/39
Inventor 杉山芳久杉浦义孝
Owner NGK SPARK PLUG CO LTD