US2586864A - Spark plug electrode - Google Patents

Spark plug electrode Download PDF

Info

Publication number
US2586864A
US2586864A US180885A US18088550A US2586864A US 2586864 A US2586864 A US 2586864A US 180885 A US180885 A US 180885A US 18088550 A US18088550 A US 18088550A US 2586864 A US2586864 A US 2586864A
Authority
US
United States
Prior art keywords
spark
plug
electrode
gap
platinum
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.)
Expired - Lifetime
Application number
US180885A
Inventor
John J Rose
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US180885A priority Critical patent/US2586864A/en
Application granted granted Critical
Publication of US2586864A publication Critical patent/US2586864A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00Sparking plugs
    • H01T13/46Sparking plugs having two or more spark gaps
    • H01T13/467Sparking plugs having two or more spark gaps in parallel connection

Definitions

  • This invention relates to spark plugs for internal combustion engines and particularly to certain improvements in the electrodes thereof, whereby the spark gap is maintained for a amended April 30, 1928; 370 0. G. 757) greatly extended period,'tl1e performance of the spark in igniting the fuel charge, is greatl improved, and high-cost material used in the ele,c trodes is conserved.
  • any'feature of design which gives the spark gap an increased life, and any configuration which fully unmasks the spark, i. e., a configuration which exposes substantially all of the spark to the firing chamber of the engine, is an important consideration in aircraft spark plug design.
  • spark plugs now in general use on aircraft engines are provided with electrodes of the best material available for long spark gap life.
  • the two materials most commonly used for the electrodes are nickel and platinum alloy.
  • a nickel alloy is used for both the ground and thecenter electrode.
  • two parallel platinum wires are used for. the electrodes.
  • the material in this type has a low erosionrate but the sparking gap surfaces are very small and thus the life of the gap surfaces are very short.
  • This type of construction is conducive to good ignition because of the open configuration of the gap, whereby there is absence of shielding of the spark.
  • the high cost of these materials makes it important that a minimum of the material be used and that it be formed so as to provide the largest possible area having the largest sparking surface exposed to the firing chamber, and that a minimum of the sparking surface be masked.
  • the primary object of my invention is to provide an electrode configuration using platinum wire in which the sparkin will take place openly, i. e., with the least shielding of the spark and which will give the largest gap area with minimum use of costly material.
  • Another object is to provide an electrode configuration which will extend the spark gap into the combustion chamber with good means for conducting the electrode heat back to less heated surfaces of the spark plug.
  • My improved design provides large opening into the nose section for reconditioning in the service.
  • Fig. 1 is a longitudinal axial section taken at
  • Fig. 2 is an end view of the spark plug shown in Fig. 1
  • Fig. 3 is a fragmentary longitudinal axial section taken at *3-3 of Fig 4 through a second type of spark plug also currently used to a considerable extent.
  • Fig. 4 is an end view of the spark plug shown in Fig. 3.
  • Fig. 5 isa fragmentary longitudinal axial section taken at 55 of Fig. 6 through my improved spark plug.
  • Fig. 6 is an end view of the spark plug shown in Fig. 5.
  • the plug body 10 made of nickel steel'or other suitable metal, is screw threaded at the forward end as at I2 for connection to an engine cylinder.
  • a core M of porcelain, or other suitable dielectric is concentrically positioned in and closely fitted into the plug body.
  • the main electrode 16 usually of round platinum wire, passes centrally through the core l4 and is held concentrically positioned thereby.
  • the grounded electrodes [8 consist of two axially transverse parallel platinum wires preferably of square cross section extending across the nose of the plug and having one end of each wire welded to the nose of the plug, the spacing between the parallel wires being such as to leave a spark gap 20 between the main electrode I6 and the grounded electrodes l8.
  • Figs. 3 and 4 show a fragmentary axial section and an end view respectively of another conventional type of spark plug known in the art as "massive electrode type or cloverleaf type.
  • the plug body Ill usually of a nickel steel alloy or like low cost conductive material is threaded at l2 for connection into the cylinder.
  • the nose of the plug body is somewhat frusto-conical, being smaller at the extreme end.
  • the core M has an outer diameter to fit the plug interior and an inner diameter to receive the main electrode 16 which may, like the plug body be made of a suitable grade of nickel steel alloy where an inexpensive plug is called for, but may preferably be made of platinum or platinum alloy if the diameter is kept small.
  • the core l4 may be made of porcelain, mica, or other suitable nonconductive material.
  • the nose I5 of the plug body is bored enough larger than the main electrode 16 to provide the gap 20, then three openings I9 in a clover-leaf pattern are cut longitudinally through the nose [5 leaving three grounded electrodes 22 which are an integral part of the body l.
  • the plug body or shell the threaded portion I2", the core [4" and the main electrode W are all conventional in configuration being substantially like those parts shown and described with reference to Figs. 3 and 4.
  • the nose 24 is first provided with a considerably enlarged bore as at 26, then counterbored to a shoulder as at 28.
  • the three clover-leaf openings l9 are formed to extend lengthwise through the shell, leaving three equally spaced electrode supports 22, which are then fitted with a platinum ring 30 which is pressed into the bore up to the shoulder and welded to the three inner ends of the supports.
  • the platinum ring 30 is preferably afterward divided into three segmental electrodes the dividing being done either before or after the welding operation or, the ring may be left whole where no adjustment of the spark gap in service is contemplated.
  • the main electrode 16 may if desired be made of nickel alloy, but may profitably be made of platinum if the diameter of the wire used is not too large, a diameter being determined upon which will leave a proper gap 34 between the outside of the main electrode l6 and the bore of the ring 30.
  • lhe ring 39 is preferably made relatively narrow, measured in an axial direction and the bore 28 of relatively large diameter, which insures that the spark will be concentrated in the gap 34 at the forward end of the plug between the platinum segments of the ring 30 and the main electrode Hi". It may be seen that with this construction, all electrodes are of platinum yet no great amount of the precious metal is required, and no considerable amount of the platinum is wasted when the plug has reached the end of its usable life. This arrangement, therefore, not only conserves platinum but localizes the spark at the forward end of the plug so that a minimum of masking is caused. Thus a massive electrode type of plug is provided having all the advantages of the conventional massive electrode plug without the disadvantage of masking pointed out with reference to the plug shown in Figs. 3 and 4.
  • An improved spark plug which comprises a hollow cylindrical body of steel or similar low cost metal, externally threaded at one end for connection to an ignition chamber, a central electrode, a series of circumferentially spaced grounded electrode supporting arms, each an integral part of said hollow cylindrical body extending from the threaded end radially inward and axially away from the threaded end, thus providing a nose on the plug which is both outside and inside somewhat in the form of a frustum of a cone, the said frustum being provided at the extreme outer end with a bore larger than the central electrode thereby leaving a spark gap and a counterbore larger than the bore, thereby providing a shoulder on the inside of each electrode supporting arm, a narrow ring of platinum or the like externally fitted to said counterbore and welded to said shoulders, the inside diameter of said ring being larger than said central electrode to provide a spark gap, and said ring being composed of as many spaced apart segments as there are elec trode supporting arms, whereby the spark gap is adjustable.

Description

Feb. 26, 1952 J. J. ROSE SPARK PLUG ELECTRODE Filed Aug. 22, 1950 INVENTOR. JOHN J. 0.55
Patented Feb. 26, 1952 UNITED STATES PATENT Y OFFICE 1 Claim.
1 The invention described herein may be manufactured and used by or for the United States government for governmental purposes without payment to me of any royalty thereon.
This invention relates to spark plugs for internal combustion engines and particularly to certain improvements in the electrodes thereof, whereby the spark gap is maintained for a amended April 30, 1928; 370 0. G. 757) greatly extended period,'tl1e performance of the spark in igniting the fuel charge, is greatl improved, and high-cost material used in the ele,c trodes is conserved.
As is well known in the art, any'feature of design which gives the spark gap an increased life, and any configuration which fully unmasks the spark, i. e., a configuration which exposes substantially all of the spark to the firing chamber of the engine, is an important consideration in aircraft spark plug design.
Spark plugs now in general use on aircraft engines are provided with electrodes of the best material available for long spark gap life. The two materials most commonly used for the electrodes are nickel and platinum alloy. In the somewhat lower cost construction a nickel alloy is used for both the ground and thecenter electrode. In another high cost spark plug type two parallel platinum wires are used for. the electrodes. The material in this type has a low erosionrate but the sparking gap surfaces are very small and thus the life of the gap surfaces are very short. This type of construction, however, is conducive to good ignition because of the open configuration of the gap, whereby there is absence of shielding of the spark. The high cost of these materials makes it important that a minimum of the material be used and that it be formed so as to provide the largest possible area having the largest sparking surface exposed to the firing chamber, and that a minimum of the sparking surface be masked.
The primary object of my invention is to provide an electrode configuration using platinum wire in which the sparkin will take place openly, i. e., with the least shielding of the spark and which will give the largest gap area with minimum use of costly material.
Another object is to provide an electrode configuration which will extend the spark gap into the combustion chamber with good means for conducting the electrode heat back to less heated surfaces of the spark plug. My improved design provides large opening into the nose section for reconditioning in the service.
,Another object is to provide a spark plu wherein the construction is rugged, the fabrication simple, and the cost low both in manufacturing and in service.
Other objects of the invention will appear from the following detailed description, reference being had to the drawing, wherein:
Fig. 1 is a longitudinal axial section taken at |-I of Fig. 2 through a conventional spark plug of a type which is in extensive use but which has faults which the present invention aims to rectify.
Fig. 2 is an end view of the spark plug shown in Fig. 1
Fig. 3 is a fragmentary longitudinal axial section taken at *3-3 of Fig 4 through a second type of spark plug also currently used to a considerable extent.
Fig. 4 is an end view of the spark plug shown in Fig. 3.
Fig. 5 isa fragmentary longitudinal axial section taken at 55 of Fig. 6 through my improved spark plug.
Fig. 6 is an end view of the spark plug shown in Fig. 5.
Like reference characters refer to like parts throughout the several views.
Referring now to the conventional plug shown in Figs. 1 and 2 the plug body 10, made of nickel steel'or other suitable metal, is screw threaded at the forward end as at I2 for connection to an engine cylinder. A core M, of porcelain, or other suitable dielectric is concentrically positioned in and closely fitted into the plug body.
The main electrode 16, usually of round platinum wire, passes centrally through the core l4 and is held concentrically positioned thereby. The grounded electrodes [8 consist of two axially transverse parallel platinum wires preferably of square cross section extending across the nose of the plug and having one end of each wire welded to the nose of the plug, the spacing between the parallel wires being such as to leave a spark gap 20 between the main electrode I6 and the grounded electrodes l8.
From a consideration of Figs. 1 and 2 it is obvious that from the nature of the gap, the spark is concentrated over a very small area of the electrodes. and while there is no shielding of the spark, the life of the electrodes is very short thus wasting all but a small part of the precious metal used.
Figs. 3 and 4 show a fragmentary axial section and an end view respectively of another conventional type of spark plug known in the art as "massive electrode type or cloverleaf type. The plug body Ill usually of a nickel steel alloy or like low cost conductive material is threaded at l2 for connection into the cylinder. The nose of the plug body is somewhat frusto-conical, being smaller at the extreme end. The core M has an outer diameter to fit the plug interior and an inner diameter to receive the main electrode 16 which may, like the plug body be made of a suitable grade of nickel steel alloy where an inexpensive plug is called for, but may preferably be made of platinum or platinum alloy if the diameter is kept small. The core l4 may be made of porcelain, mica, or other suitable nonconductive material.
The nose I5 of the plug body is bored enough larger than the main electrode 16 to provide the gap 20, then three openings I9 in a clover-leaf pattern are cut longitudinally through the nose [5 leaving three grounded electrodes 22 which are an integral part of the body l.
While the design shown in Figs. 3 and 4 is conducive to economical manufacture, there is a quite serious fault in that the .spark may localize at the front or at the rear of the gap 20 or in between, whereby a considerable portion of the spark is hidden or masked; which results in unsatisfactory ignition.
Turning now to the present invention which is shown in Figs. 5 and 6, the plug body or shell the threaded portion I2", the core [4" and the main electrode W are all conventional in configuration being substantially like those parts shown and described with reference to Figs. 3 and 4.
In the present invention, however, the nose 24 is first provided with a considerably enlarged bore as at 26, then counterbored to a shoulder as at 28. The three clover-leaf openings l9 are formed to extend lengthwise through the shell, leaving three equally spaced electrode supports 22, which are then fitted with a platinum ring 30 which is pressed into the bore up to the shoulder and welded to the three inner ends of the supports. The platinum ring 30 is preferably afterward divided into three segmental electrodes the dividing being done either before or after the welding operation or, the ring may be left whole where no adjustment of the spark gap in service is contemplated. The main electrode 16 may if desired be made of nickel alloy, but may profitably be made of platinum if the diameter of the wire used is not too large, a diameter being determined upon which will leave a proper gap 34 between the outside of the main electrode l6 and the bore of the ring 30.
lhe ring 39 is preferably made relatively narrow, measured in an axial direction and the bore 28 of relatively large diameter, which insures that the spark will be concentrated in the gap 34 at the forward end of the plug between the platinum segments of the ring 30 and the main electrode Hi". It may be seen that with this construction, all electrodes are of platinum yet no great amount of the precious metal is required, and no considerable amount of the platinum is wasted when the plug has reached the end of its usable life. This arrangement, therefore, not only conserves platinum but localizes the spark at the forward end of the plug so that a minimum of masking is caused. Thus a massive electrode type of plug is provided having all the advantages of the conventional massive electrode plug without the disadvantage of masking pointed out with reference to the plug shown in Figs. 3 and 4.
Having described one embodiment of my invention, I claim:
An improved spark plug which comprises a hollow cylindrical body of steel or similar low cost metal, externally threaded at one end for connection to an ignition chamber, a central electrode, a series of circumferentially spaced grounded electrode supporting arms, each an integral part of said hollow cylindrical body extending from the threaded end radially inward and axially away from the threaded end, thus providing a nose on the plug which is both outside and inside somewhat in the form of a frustum of a cone, the said frustum being provided at the extreme outer end with a bore larger than the central electrode thereby leaving a spark gap and a counterbore larger than the bore, thereby providing a shoulder on the inside of each electrode supporting arm, a narrow ring of platinum or the like externally fitted to said counterbore and welded to said shoulders, the inside diameter of said ring being larger than said central electrode to provide a spark gap, and said ring being composed of as many spaced apart segments as there are elec trode supporting arms, whereby the spark gap is adjustable.
2 JOHN J. ROSE.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,128,580 Brown Feb. 16, 1915 1,325,439 Dinger Dec. 16, 1919 2,109,029 Nowosielski Feb. 22, 1938 2,208,030 Holmes a July 16, 1940 2,356,102 Tognola Aug. 15, 1944 2,391,456 Hensel Dec. 25, 1945
US180885A 1950-08-22 1950-08-22 Spark plug electrode Expired - Lifetime US2586864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US180885A US2586864A (en) 1950-08-22 1950-08-22 Spark plug electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US180885A US2586864A (en) 1950-08-22 1950-08-22 Spark plug electrode

Publications (1)

Publication Number Publication Date
US2586864A true US2586864A (en) 1952-02-26

Family

ID=22662088

Family Applications (1)

Application Number Title Priority Date Filing Date
US180885A Expired - Lifetime US2586864A (en) 1950-08-22 1950-08-22 Spark plug electrode

Country Status (1)

Country Link
US (1) US2586864A (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957099A (en) * 1959-09-18 1960-10-18 Hastings Mfg Co Spark plugs
US3017532A (en) * 1956-02-27 1962-01-16 Gen Am Transport Electrical elements
US3597648A (en) * 1966-12-02 1971-08-03 Toyo Kogyo Co Combination of spark plug and combustion chamber having connected conical and cylindrical sections
FR2468234A1 (en) * 1979-10-22 1981-04-30 Champion Spark Plug Co IGNITION CANDLE
DE3008963A1 (en) * 1980-03-08 1981-09-24 Robert Bosch Gmbh, 7000 Stuttgart Spark plug electrode assembly - has long reach for high heat conductivity and heat dissipation of electrode
US4354136A (en) * 1979-03-08 1982-10-12 Nissan Motor Company, Limited Ignition plug for internal combustion engine
US5408961A (en) * 1993-08-09 1995-04-25 Innovative Automative Technologies Int. Ltd. Ignition plug
US5612586A (en) * 1994-06-30 1997-03-18 Robert Bosch Gmbh Spark plug for internal combustion engines
US20110146227A1 (en) * 2009-12-23 2011-06-23 Brendon Francis Mee Apparatus and assembly for a spark igniter
US8584648B2 (en) * 2010-11-23 2013-11-19 Woodward, Inc. Controlled spark ignited flame kernel flow
US8839762B1 (en) 2013-06-10 2014-09-23 Woodward, Inc. Multi-chamber igniter
US9172217B2 (en) 2010-11-23 2015-10-27 Woodward, Inc. Pre-chamber spark plug with tubular electrode and method of manufacturing same
US9385510B2 (en) 2014-09-01 2016-07-05 Denso Corporation Spark plug for internal combustion engine and method of manufacturing spark plug
US9476347B2 (en) 2010-11-23 2016-10-25 Woodward, Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
US9653886B2 (en) 2015-03-20 2017-05-16 Woodward, Inc. Cap shielded ignition system
US9765682B2 (en) 2013-06-10 2017-09-19 Woodward, Inc. Multi-chamber igniter
US9793687B2 (en) 2015-09-15 2017-10-17 Denso Corporation Spark plug for internal combustion engine, having an annular ground electrode facing an outer circumference of a center electrode
US9825432B2 (en) 2015-09-11 2017-11-21 Denso Corporation Spark plug for internal combustion engine and production method thereof
US9840963B2 (en) 2015-03-20 2017-12-12 Woodward, Inc. Parallel prechamber ignition system
US9856848B2 (en) 2013-01-08 2018-01-02 Woodward, Inc. Quiescent chamber hot gas igniter
US9890689B2 (en) 2015-10-29 2018-02-13 Woodward, Inc. Gaseous fuel combustion
US9948066B2 (en) 2015-07-01 2018-04-17 Federal-Mogul Ignition Gmbh Spark plug
US20180363592A1 (en) * 2015-12-01 2018-12-20 Delphi Technologies Ip Limited Gaseous fuel injectors
US20190181620A1 (en) * 2017-12-12 2019-06-13 Denso Corporation Spark plug for internal combustion engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1128580A (en) * 1912-03-14 1915-02-16 Willis S Brown Spark-plug.
US1325439A (en) * 1919-12-16 Spark-plug
US2109029A (en) * 1937-01-18 1938-02-22 Eclipse Aviat Corp Ignition apparatus
US2208030A (en) * 1939-11-06 1940-07-16 Holmes Induction Deviees Inc Spark plug
US2356102A (en) * 1940-07-09 1944-08-15 Bendix Aviat Corp Ignition apparatus and method of making the same
US2391456A (en) * 1944-01-29 1945-12-25 Mallory & Co Inc P R Spark plug electrode

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1325439A (en) * 1919-12-16 Spark-plug
US1128580A (en) * 1912-03-14 1915-02-16 Willis S Brown Spark-plug.
US2109029A (en) * 1937-01-18 1938-02-22 Eclipse Aviat Corp Ignition apparatus
US2208030A (en) * 1939-11-06 1940-07-16 Holmes Induction Deviees Inc Spark plug
US2356102A (en) * 1940-07-09 1944-08-15 Bendix Aviat Corp Ignition apparatus and method of making the same
US2391456A (en) * 1944-01-29 1945-12-25 Mallory & Co Inc P R Spark plug electrode

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017532A (en) * 1956-02-27 1962-01-16 Gen Am Transport Electrical elements
US2957099A (en) * 1959-09-18 1960-10-18 Hastings Mfg Co Spark plugs
US3597648A (en) * 1966-12-02 1971-08-03 Toyo Kogyo Co Combination of spark plug and combustion chamber having connected conical and cylindrical sections
US4354136A (en) * 1979-03-08 1982-10-12 Nissan Motor Company, Limited Ignition plug for internal combustion engine
FR2468234A1 (en) * 1979-10-22 1981-04-30 Champion Spark Plug Co IGNITION CANDLE
DE3008963A1 (en) * 1980-03-08 1981-09-24 Robert Bosch Gmbh, 7000 Stuttgart Spark plug electrode assembly - has long reach for high heat conductivity and heat dissipation of electrode
US5408961A (en) * 1993-08-09 1995-04-25 Innovative Automative Technologies Int. Ltd. Ignition plug
US5612586A (en) * 1994-06-30 1997-03-18 Robert Bosch Gmbh Spark plug for internal combustion engines
US20110146227A1 (en) * 2009-12-23 2011-06-23 Brendon Francis Mee Apparatus and assembly for a spark igniter
EP2339706A1 (en) * 2009-12-23 2011-06-29 Unison Industries LLC Apparatus and assembly for a spark plug
US8534041B2 (en) 2009-12-23 2013-09-17 Unison Industries, Llc Apparatus and assembly for a spark igniter having tangential embedded pins
US20170044970A1 (en) * 2010-11-23 2017-02-16 Woodward, Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
US9172217B2 (en) 2010-11-23 2015-10-27 Woodward, Inc. Pre-chamber spark plug with tubular electrode and method of manufacturing same
US9476347B2 (en) 2010-11-23 2016-10-25 Woodward, Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
US8584648B2 (en) * 2010-11-23 2013-11-19 Woodward, Inc. Controlled spark ignited flame kernel flow
US11674494B2 (en) 2010-11-23 2023-06-13 Woodward, Inc. Pre-chamber spark plug with tubular electrode and method of manufacturing same
US10907532B2 (en) * 2010-11-23 2021-02-02 Woodward. Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
US9893497B2 (en) 2010-11-23 2018-02-13 Woodward, Inc. Controlled spark ignited flame kernel flow
US9856848B2 (en) 2013-01-08 2018-01-02 Woodward, Inc. Quiescent chamber hot gas igniter
US10054102B2 (en) 2013-01-08 2018-08-21 Woodward, Inc. Quiescent chamber hot gas igniter
US8839762B1 (en) 2013-06-10 2014-09-23 Woodward, Inc. Multi-chamber igniter
US9765682B2 (en) 2013-06-10 2017-09-19 Woodward, Inc. Multi-chamber igniter
US9385510B2 (en) 2014-09-01 2016-07-05 Denso Corporation Spark plug for internal combustion engine and method of manufacturing spark plug
US9653886B2 (en) 2015-03-20 2017-05-16 Woodward, Inc. Cap shielded ignition system
US9843165B2 (en) 2015-03-20 2017-12-12 Woodward, Inc. Cap shielded ignition system
US9840963B2 (en) 2015-03-20 2017-12-12 Woodward, Inc. Parallel prechamber ignition system
US9948066B2 (en) 2015-07-01 2018-04-17 Federal-Mogul Ignition Gmbh Spark plug
US9825432B2 (en) 2015-09-11 2017-11-21 Denso Corporation Spark plug for internal combustion engine and production method thereof
US9793687B2 (en) 2015-09-15 2017-10-17 Denso Corporation Spark plug for internal combustion engine, having an annular ground electrode facing an outer circumference of a center electrode
US9890689B2 (en) 2015-10-29 2018-02-13 Woodward, Inc. Gaseous fuel combustion
US20180363592A1 (en) * 2015-12-01 2018-12-20 Delphi Technologies Ip Limited Gaseous fuel injectors
US10683829B2 (en) * 2015-12-01 2020-06-16 Delphi Technologies Ip Limited Gaseous fuel injectors
US20190181620A1 (en) * 2017-12-12 2019-06-13 Denso Corporation Spark plug for internal combustion engine
US10476238B2 (en) * 2017-12-12 2019-11-12 Denso Corporation Spark plug for internal combustion engine

Similar Documents

Publication Publication Date Title
US2586864A (en) Spark plug electrode
US8278808B2 (en) Metallic insulator coating for high capacity spark plug
US4023058A (en) Spark plug
US3842818A (en) Ignition devices
US4771209A (en) Spark igniter having precious metal ground electrode inserts
US6329743B1 (en) Current peaking sparkplug
US3567987A (en) Spark plug construction
US9564740B2 (en) Spark plug for a gas-powered internal combustion engine
US2616407A (en) Spark plug
EP2922158B1 (en) Spark plug and ignition system
US4015160A (en) Spark plug having electrodes shaped to produce a hollow spark column
US2506768A (en) Glow plug for internal-combustion engines
US8729784B2 (en) Fouling resistant spark plug
US4307316A (en) Self cleaning spark plug
CA1053523A (en) Ignition devices for internal combustion engines
US2262769A (en) Spark plug
US2874321A (en) Igniter plug
US2870376A (en) Electrical apparatus
US4007391A (en) Igniters
USH1598H (en) Liquid propellant igniter
US5297510A (en) Volume ignition system
US3004184A (en) Surface discharge multiple gap sparking plug
US3014151A (en) Electrical apparatus
US1216139A (en) Spark-plug for internal-combustion engines.
US3872338A (en) Spark plug