US 12,009,639 B2 · Spark plug

Abstract

A spark plug that can reduce variation in a discharge point. The spark plug includes: a center electrode; a metal shell insulating and holding the center electrode; and a ground electrode including a base material having one end portion connected to the metal shell, and a tip connected to another end portion of the base material. The tip has a discharge surface opposed to the center electrode with a spark gap therebetween. The discharge surface has a quadrangular shape and is chamfered at four sides thereof. Only a first side which is one of the four sides is provided with a C chamfer.

Claims7

Dependent claims

A spark plug comprising:

a center electrode;
a metal shell insulating and holding the center electrode;
and
a ground electrode including a base material having one end portion connected to the metal shell, and a tip connected to another end portion of the base material, wherein
the tip has a discharge surface opposed to the center electrode with a spark gap therebetween,
the discharge surface has a quadrangular shape and is chamfered at four sides thereof, and
only a first side which is one of the four sides is provided with a C chamfer.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/437,679Filed 17 Nov 2020

Priority

JP 2019-21746129 Nov 2019

Published

US 2022/0166196 A126 May 2022

Granted

11 Jun 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H01T 13/20
Sparking plugs: characterised by features of the electrodes or insulation
H01T 13/32
Characterised by features of the electrodes or insulation: characterised by features of the earthed electrode
H01T 13/06
Details: covers forming a part of the plug and protecting it against adverse environment
H01T 21/02
Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs: of sparking plugs

Spark plug

Life of this patent

Spark plug

Life of this patent

Abstract

Claims7