JPS647491A - Ignition plug - Google Patents

Ignition plug

Info

Publication number
JPS647491A
JPS647491A JP16414787A JP16414787A JPS647491A JP S647491 A JPS647491 A JP S647491A JP 16414787 A JP16414787 A JP 16414787A JP 16414787 A JP16414787 A JP 16414787A JP S647491 A JPS647491 A JP S647491A
Authority
JP
Japan
Prior art keywords
central electrode
ignition plug
diameter
tip end
taper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16414787A
Other languages
Japanese (ja)
Other versions
JPH0777157B2 (en
Inventor
Takashi Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Priority to JP62164147A priority Critical patent/JPH0777157B2/en
Publication of JPS647491A publication Critical patent/JPS647491A/en
Publication of JPH0777157B2 publication Critical patent/JPH0777157B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Spark Plugs (AREA)

Abstract

PURPOSE:To lower discharge voltage and reduce dispersion by specifying the diameter of a central electrode at a position of more than a specified distance from the tip end surface of the central electrode and forming it in steps or a taper. CONSTITUTION:The diameter d2 of a central electrode 1 at a position of a distance of at least 1.5mm from the tip end surface 2a of the central electrode is set to be within the range of 1.0-1.5 times the diameter d1 of the tip end to be formed in steps or a taper. This makes it possible to lower discharge voltage of an ignition plug including a platinum tip 2 at least on the discharge surface of the central electrode 1, and stable spark discharge characteristics can be kept for use for a long period. Especially in urban running conditions at 40-60km/h, flame-out of the ignition plug is prevented and stable ignitionability can be obtained.
JP62164147A 1987-06-30 1987-06-30 Spark plug Expired - Fee Related JPH0777157B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62164147A JPH0777157B2 (en) 1987-06-30 1987-06-30 Spark plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62164147A JPH0777157B2 (en) 1987-06-30 1987-06-30 Spark plug

Publications (2)

Publication Number Publication Date
JPS647491A true JPS647491A (en) 1989-01-11
JPH0777157B2 JPH0777157B2 (en) 1995-08-16

Family

ID=15787639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62164147A Expired - Fee Related JPH0777157B2 (en) 1987-06-30 1987-06-30 Spark plug

Country Status (1)

Country Link
JP (1) JPH0777157B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4947374A (en) * 1987-05-12 1990-08-07 Mitsubishi Denki Kabushiki Kaisha Semiconductor memeory device in which writing is inhibited in address skew period and controlling method thereof
DE4414545B4 (en) * 1993-04-28 2004-07-08 Denso Corp., Kariya spark plug
JP2011171102A (en) * 2010-02-18 2011-09-01 Ngk Spark Plug Co Ltd Spark plug
JP2011171305A (en) * 2011-03-31 2011-09-01 Ngk Spark Plug Co Ltd Spark plug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61171080A (en) * 1985-01-24 1986-08-01 日本特殊陶業株式会社 Ingnition plug

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61171080A (en) * 1985-01-24 1986-08-01 日本特殊陶業株式会社 Ingnition plug

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4947374A (en) * 1987-05-12 1990-08-07 Mitsubishi Denki Kabushiki Kaisha Semiconductor memeory device in which writing is inhibited in address skew period and controlling method thereof
DE4414545B4 (en) * 1993-04-28 2004-07-08 Denso Corp., Kariya spark plug
JP2011171102A (en) * 2010-02-18 2011-09-01 Ngk Spark Plug Co Ltd Spark plug
US8841826B2 (en) 2010-02-18 2014-09-23 Ngk Spark Plug Co., Ltd. Spark plug
JP2011171305A (en) * 2011-03-31 2011-09-01 Ngk Spark Plug Co Ltd Spark plug

Also Published As

Publication number Publication date
JPH0777157B2 (en) 1995-08-16

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees