CA2044622C - Spark plug with ring shaped ground electrode - Google Patents
Spark plug with ring shaped ground electrode Download PDFInfo
- Publication number
- CA2044622C CA2044622C CA002044622A CA2044622A CA2044622C CA 2044622 C CA2044622 C CA 2044622C CA 002044622 A CA002044622 A CA 002044622A CA 2044622 A CA2044622 A CA 2044622A CA 2044622 C CA2044622 C CA 2044622C
- Authority
- CA
- Canada
- Prior art keywords
- ground electrode
- spark plug
- electrode
- plug according
- ring
- 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 - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/46—Sparking plugs having two or more spark gaps
- H01T13/467—Sparking plugs having two or more spark gaps in parallel connection
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- Spark Plugs (AREA)
Abstract
Abstract Spark plug for an internal combustion engine having a metal shell (20) enclosing a ceramic insulator (16) containing a conductive centre electrode (18) having a bottom end (58) exiting from the insulator.
The bottom end of the centre electrode is spaced apart from a groud electrode ( 12) attached to the metal shell by at least one support member or mounting post (38) . The ground electrode is ring/open-ring shaped and its interior diameter ranges from equal to the exterior diameter of the centre electrode to a multiple of the size of the interior diameter of the centre electrode.
Fig. 1
The bottom end of the centre electrode is spaced apart from a groud electrode ( 12) attached to the metal shell by at least one support member or mounting post (38) . The ground electrode is ring/open-ring shaped and its interior diameter ranges from equal to the exterior diameter of the centre electrode to a multiple of the size of the interior diameter of the centre electrode.
Fig. 1
Description
SF~ARK PLUG WITH A RI1NG/OF~N~.RING SHAFED GROUND
ELECTRODE
This invention relates to a spark plug for an internal combustion engine having a metal shell at least partially enclosing an insulator the containing a conductive centre electrode, the centre electrode having a bottom end exiting from the insulator at a bottom end of spark plug, the bottom end off the eentre electrode being spaced spar t Pram a ground electrode attached to the metal shell by at least one support member.
Commercial internal combustion engine spark plugs in current wide spread use have characteristically had a centre electrode with an exposed end in its base that is spaced apart from a ground electrode. The ground electrode is usually a single arm welded to an edge of the plug and bent over towards the centre electrode at substantially a right angle. Although these plugs work satisfactorily, it has been determined that their design substantially detracts from a complete burn cycle in an internal combustion engine's combustion chamber. This results in the overheating of plug parts, incomplete combustion and the production of oxides of nitrogen in the combustion chamber.
Attempts at improving plug firing and achi.e~i.ng a more complete combustion chamber burn has received little research effort compared to other methods of reducing oxides of nitrogen automotive emissions .
U . S , Patent 2, 487, 535 describes an annular tapered curved f ork as a spark plug ground electrode for the purpose of "conducting excessive heat away". Column 1, lines 50-51. The central electrode terminates in a position on a plane with the ground electrode sa that the spark is substantially perpendicular to the longitudinal plane of the spark plug. Such a spark geometry does not provide for a large surface area to promote active combustion.
U . S . Patents 2, 874,162 and 4, 2~8, 774 describe ground electrodes having diverging prongs. Such a configuration increases the spark _2_ surface area and improves combustion chamber burning. However, substantial further improvement in burning efficiency in the combustion chamber due to spark generation could be made.
In accordance with the invention, an internal combustion engine spark plug has a metal housing at least partially enclosing an insulator containing a conductive centre electrode. The centre electrode has a bottom portion in the form of a solid cylinder with a planar surface at an end distal from the insulator and extends from the insulator at the bottom end of the spark plug. T'he bottom end of the centre electrode is vertically spaced by about .89 to 1.22 mm from the ground electrode which is attached to the metal housing. The ground electrode has an ring shaped firing portion attached to the metal housing by at least one integral mounting post, the ring shaped firing portion has a gap from zero to 2.5 mm. The top of the firing portion of the ground electrode is fixed at a distance from and is positioned parallel to the bottom planar surface of the centre electrode. The inner annular circumference of the ground electrode is concentric with the centre electrode. The ground electrode inner diameter is substantially equal to the exterior diameter of the centre electrode and the firing pattern of the spark plug from the centre electrode forms an annular ring pattern around the top of the ground electrode firing portion.
In a preferred embodiment of the invention the inner diameter of the ground electrode is from 1 to 1.1 times the outer diameter of the centre electrode.
In a further preferred embodiment of the invention, the mounting post for the ring shaped ground electrode is a substantially L-shaped supporting bracket. In further preferred embodiment of the invention the ring shaped ground electrode is attached to the metal shell of the spark plug by at least three spaced mounting posts.
It has been established that an uniform diameter ring shaped ground electrode mounted to a mounting post attached to a mounting ring or spot welded to a side of the spark plug produces multiple spark arcs around the inner top surface of the ground electrode from the central electrode. These multiple sparks result in a more complete fuel burning in the combustion chamber and thereby an increase in engine horse power together with a reduction of oxides of nitrogen emissions from the engine exhaust system.
The ring shaped ground electrode provides the maximal ignition area of any possible ground electrode design. The tests prove that the spark plug of the invention runs 10 to 15° cooler than standard plugs and that it continues firing under more pressure per square-inch than any other spark plug available on the market.
The invention may be best understood by those having ordinary skill in the art by reference to the following detailed description when considered in conjunction with the accompanying drawings in which:
Fig. 1 is an isometric view of one embodiment of the spark plug of this invention.
Fig. 2 is an exploded view of the ground electrode component in relation to the bottom of the spark plug of Fig . 1.
Fig. 3 is an isometric view of the ground electrode mounted within a spark plug cup of the spark plug of Fig. 1. ' Fig. 4 is an isometric view of the ground electrode in the spark plug cup of Fig. 3 showing the method of locking the ground electrode in place.
Fig. 5 is a bottom plan view of the spark plug of Fig. 1.
Fig . 6 is an exploded view of an alternate ground electrode component in relation to a spark plug cup.
Fig. 7 is an i$ometric view of the ground electrode component of Fig.
6 welded in place.
Fig. 8 fs an elevation view of the spark plug of Fig. 1.
Fig. 9 is an isometric view of another embodiment of the spark plug according to the invention.
Fig. 10 is a bottom plan view of the spark plug of Fig. 9, Fig. 11 is a plan view of a stamped blank of a ring/open-ring shaped electrode and the attached mounting posts.
Fig. 12 is an elevation view of the ring/open-ring shaped electrode and the attached mounting post realized with the stamped blank of Fig. 11.
Throughout the following detailed description, the same reference numerals refer to the same elements in all figures. The spark plug has been shown in a base up position in the drawings fax ease of description. However, the base is considered 1n its usual lower position for purposes of the description that follows.
Spark plug 10 shown in );ig. 1 is a conventional internal combustion engine spark plug except for the xing/open-ring shaped ground electrode 12 substituted for the rod like ground electrode seen in conventional spark plugs. The spark plug 10 shown in Fig. 1 has a terminal element 14 Connected to a coil wire (not shown) . A high quality insulator such as a cer amic material 16 encapsulates a central electrode which terminates at the bottom of the spark plug 10 as exposed central electrode 18, The ceramic material could be substituted with a high temperature resistant copolymer. The bottom portion of the spark plug 10 has a metal shell 20 and a nut portion 22. The shell 20 terminates in a shank 24 which has a shank skirt 26. The interior portion of the shank 24 is in the shape of a cup 28.
The centre electrode 18 is located in the centre of the cup 28. In addition, the interior surface of the shank skirt 26 has an inwardly protruding annular shelf 30.
The ground electrode 12 of the invention is ring/open-ring shaped and has a gap 36 defined by two arms 32 and 36 having two substantially parallel edges 36a and 36b. The distance between the parallel edges 36a and 36b is of about 0 to .09$ of an inch or 0 to 2.~ mm. bistal from the gap 36 is a mounting post 3$ attached at a first end 40 to the back end of the ring/open-.r9ng shaped ground electrode 12 and at a second end 42 to a mounting ring 44.
In constructing the spark plug of the invention the ground electrode component 46 consisting of the mounting ring 44, the mounting post 38 and the ring~open-ring shaped electrode 12 is preferably cast frpm a high quality metal such as a nickel/chromium alloy, platinum alloy and the like. The sharp right angle 48 of mounting post 38 is important to enhance the spark qualities to be discussed hereafter.
The ground electrode component 46 is dropped on top of shelf 30 as shown in Fig. 2 with the spark plug 10 in an inverted position.
Notches 50 are vertically cut in the edge 52 of shank skirt 26. The metal sections 54 between notches 50 are bent or crimped as shown in Fig. 4, over the mounting ring 44 to insure a fixed mounting position of the component 46 within the bottom of the spark plug 10. The distance 60 between the ground electrode 12 top surface 56 and the bottom surface 58 of centre electrode 18 is ,035 to .o1,5 of an inch ar p.89 to 1.22 mm. See Fig. 8. Greater or lesser spacing may be required for combustion chambers of unusual design or fuels substituted far gasoline such as propane, methanol or ethanol.
Upon firing, the electrical spark moves from the centre electrode 18 along the top surface 56 of electrode 12. The angle of the spark from electrode 18 to the top surface 5f of electrode 12 is less than thirty degrees and preferably is less than fifteen degrees from the longitudinal axis of the spark plug .
The ring/open-ring shaped ground electrode 12 of the invention will generate six to eight firing patterns so that the flame spread around the periphery of the ground electrode is enhanced. Such an uniform flame spread produces up to twenty percent added horsepower for a given amount of fuel and approximately three to six miles per gallon increased fuel economy. In addition, there is a reduction of twenty-five to thirty-five percent in hydro-carbons and a reduction in carbon monoxide, carbon dioxide and oxides of nitrogen in the exhaust gasses. As a further advantage, the spark plug life is at least doubled aver a conventional spark plug since the distribution of the spark along the arms 32 and 3l~ prevent the single type burn which occurs an a conventional ground electrode. Combustion chamber smoulder time is reduced more than 50 %.
py casting the electrade 12, greater variability in the metal usage can be achieved to obtain the optimum longevity of the electrode 12.
Alternatively, the wlectrode 12 can be stamped o«t or ground ont from a piece of m~~.al.
An alternative embodiment of the invention ie shown in Fi~a 6 and 7 wherein the mounting ring 44 is not used and the ~roun~i electrode 12a is merely mounted nt a right angle 48a to a mountins post 38a which is spot welded to the edge 52a of a spark plug skirt 26a at the second end 42a. The first end 40a of post 38a is attached to the back end of Around electrode 12a.
The spark plug of Fibs 9 and 10 comprises a ground electrod~~
component 46 consisting of the rin~/open-rind shaped ground electrode 12 and three mounting posts 70 which are welded on the end surface of the shank skirt 26. Preferably the number of mounting posts 70 is three but this number may be decreased or increased.
According to the embodiment shown by Fi~a. 11 and 12, the component 66 is stamped out from n metal plate an3 the free end portions 71 of the mounting posts are slightly curved to be located in a plane parallel to the plane of the ring/open-ring ahape3 ground electrode.
The improved spark plug of this invention can be used in conventional internal combustion engines for automobiles, boats, r.irplanes, ia:~n-mowers and like articles ef manufacture. It also improves horsepower ir, dual plug cylinders and in combustion chambers with enhanced turbulence.
ELECTRODE
This invention relates to a spark plug for an internal combustion engine having a metal shell at least partially enclosing an insulator the containing a conductive centre electrode, the centre electrode having a bottom end exiting from the insulator at a bottom end of spark plug, the bottom end off the eentre electrode being spaced spar t Pram a ground electrode attached to the metal shell by at least one support member.
Commercial internal combustion engine spark plugs in current wide spread use have characteristically had a centre electrode with an exposed end in its base that is spaced apart from a ground electrode. The ground electrode is usually a single arm welded to an edge of the plug and bent over towards the centre electrode at substantially a right angle. Although these plugs work satisfactorily, it has been determined that their design substantially detracts from a complete burn cycle in an internal combustion engine's combustion chamber. This results in the overheating of plug parts, incomplete combustion and the production of oxides of nitrogen in the combustion chamber.
Attempts at improving plug firing and achi.e~i.ng a more complete combustion chamber burn has received little research effort compared to other methods of reducing oxides of nitrogen automotive emissions .
U . S , Patent 2, 487, 535 describes an annular tapered curved f ork as a spark plug ground electrode for the purpose of "conducting excessive heat away". Column 1, lines 50-51. The central electrode terminates in a position on a plane with the ground electrode sa that the spark is substantially perpendicular to the longitudinal plane of the spark plug. Such a spark geometry does not provide for a large surface area to promote active combustion.
U . S . Patents 2, 874,162 and 4, 2~8, 774 describe ground electrodes having diverging prongs. Such a configuration increases the spark _2_ surface area and improves combustion chamber burning. However, substantial further improvement in burning efficiency in the combustion chamber due to spark generation could be made.
In accordance with the invention, an internal combustion engine spark plug has a metal housing at least partially enclosing an insulator containing a conductive centre electrode. The centre electrode has a bottom portion in the form of a solid cylinder with a planar surface at an end distal from the insulator and extends from the insulator at the bottom end of the spark plug. T'he bottom end of the centre electrode is vertically spaced by about .89 to 1.22 mm from the ground electrode which is attached to the metal housing. The ground electrode has an ring shaped firing portion attached to the metal housing by at least one integral mounting post, the ring shaped firing portion has a gap from zero to 2.5 mm. The top of the firing portion of the ground electrode is fixed at a distance from and is positioned parallel to the bottom planar surface of the centre electrode. The inner annular circumference of the ground electrode is concentric with the centre electrode. The ground electrode inner diameter is substantially equal to the exterior diameter of the centre electrode and the firing pattern of the spark plug from the centre electrode forms an annular ring pattern around the top of the ground electrode firing portion.
In a preferred embodiment of the invention the inner diameter of the ground electrode is from 1 to 1.1 times the outer diameter of the centre electrode.
In a further preferred embodiment of the invention, the mounting post for the ring shaped ground electrode is a substantially L-shaped supporting bracket. In further preferred embodiment of the invention the ring shaped ground electrode is attached to the metal shell of the spark plug by at least three spaced mounting posts.
It has been established that an uniform diameter ring shaped ground electrode mounted to a mounting post attached to a mounting ring or spot welded to a side of the spark plug produces multiple spark arcs around the inner top surface of the ground electrode from the central electrode. These multiple sparks result in a more complete fuel burning in the combustion chamber and thereby an increase in engine horse power together with a reduction of oxides of nitrogen emissions from the engine exhaust system.
The ring shaped ground electrode provides the maximal ignition area of any possible ground electrode design. The tests prove that the spark plug of the invention runs 10 to 15° cooler than standard plugs and that it continues firing under more pressure per square-inch than any other spark plug available on the market.
The invention may be best understood by those having ordinary skill in the art by reference to the following detailed description when considered in conjunction with the accompanying drawings in which:
Fig. 1 is an isometric view of one embodiment of the spark plug of this invention.
Fig. 2 is an exploded view of the ground electrode component in relation to the bottom of the spark plug of Fig . 1.
Fig. 3 is an isometric view of the ground electrode mounted within a spark plug cup of the spark plug of Fig. 1. ' Fig. 4 is an isometric view of the ground electrode in the spark plug cup of Fig. 3 showing the method of locking the ground electrode in place.
Fig. 5 is a bottom plan view of the spark plug of Fig. 1.
Fig . 6 is an exploded view of an alternate ground electrode component in relation to a spark plug cup.
Fig. 7 is an i$ometric view of the ground electrode component of Fig.
6 welded in place.
Fig. 8 fs an elevation view of the spark plug of Fig. 1.
Fig. 9 is an isometric view of another embodiment of the spark plug according to the invention.
Fig. 10 is a bottom plan view of the spark plug of Fig. 9, Fig. 11 is a plan view of a stamped blank of a ring/open-ring shaped electrode and the attached mounting posts.
Fig. 12 is an elevation view of the ring/open-ring shaped electrode and the attached mounting post realized with the stamped blank of Fig. 11.
Throughout the following detailed description, the same reference numerals refer to the same elements in all figures. The spark plug has been shown in a base up position in the drawings fax ease of description. However, the base is considered 1n its usual lower position for purposes of the description that follows.
Spark plug 10 shown in );ig. 1 is a conventional internal combustion engine spark plug except for the xing/open-ring shaped ground electrode 12 substituted for the rod like ground electrode seen in conventional spark plugs. The spark plug 10 shown in Fig. 1 has a terminal element 14 Connected to a coil wire (not shown) . A high quality insulator such as a cer amic material 16 encapsulates a central electrode which terminates at the bottom of the spark plug 10 as exposed central electrode 18, The ceramic material could be substituted with a high temperature resistant copolymer. The bottom portion of the spark plug 10 has a metal shell 20 and a nut portion 22. The shell 20 terminates in a shank 24 which has a shank skirt 26. The interior portion of the shank 24 is in the shape of a cup 28.
The centre electrode 18 is located in the centre of the cup 28. In addition, the interior surface of the shank skirt 26 has an inwardly protruding annular shelf 30.
The ground electrode 12 of the invention is ring/open-ring shaped and has a gap 36 defined by two arms 32 and 36 having two substantially parallel edges 36a and 36b. The distance between the parallel edges 36a and 36b is of about 0 to .09$ of an inch or 0 to 2.~ mm. bistal from the gap 36 is a mounting post 3$ attached at a first end 40 to the back end of the ring/open-.r9ng shaped ground electrode 12 and at a second end 42 to a mounting ring 44.
In constructing the spark plug of the invention the ground electrode component 46 consisting of the mounting ring 44, the mounting post 38 and the ring~open-ring shaped electrode 12 is preferably cast frpm a high quality metal such as a nickel/chromium alloy, platinum alloy and the like. The sharp right angle 48 of mounting post 38 is important to enhance the spark qualities to be discussed hereafter.
The ground electrode component 46 is dropped on top of shelf 30 as shown in Fig. 2 with the spark plug 10 in an inverted position.
Notches 50 are vertically cut in the edge 52 of shank skirt 26. The metal sections 54 between notches 50 are bent or crimped as shown in Fig. 4, over the mounting ring 44 to insure a fixed mounting position of the component 46 within the bottom of the spark plug 10. The distance 60 between the ground electrode 12 top surface 56 and the bottom surface 58 of centre electrode 18 is ,035 to .o1,5 of an inch ar p.89 to 1.22 mm. See Fig. 8. Greater or lesser spacing may be required for combustion chambers of unusual design or fuels substituted far gasoline such as propane, methanol or ethanol.
Upon firing, the electrical spark moves from the centre electrode 18 along the top surface 56 of electrode 12. The angle of the spark from electrode 18 to the top surface 5f of electrode 12 is less than thirty degrees and preferably is less than fifteen degrees from the longitudinal axis of the spark plug .
The ring/open-ring shaped ground electrode 12 of the invention will generate six to eight firing patterns so that the flame spread around the periphery of the ground electrode is enhanced. Such an uniform flame spread produces up to twenty percent added horsepower for a given amount of fuel and approximately three to six miles per gallon increased fuel economy. In addition, there is a reduction of twenty-five to thirty-five percent in hydro-carbons and a reduction in carbon monoxide, carbon dioxide and oxides of nitrogen in the exhaust gasses. As a further advantage, the spark plug life is at least doubled aver a conventional spark plug since the distribution of the spark along the arms 32 and 3l~ prevent the single type burn which occurs an a conventional ground electrode. Combustion chamber smoulder time is reduced more than 50 %.
py casting the electrade 12, greater variability in the metal usage can be achieved to obtain the optimum longevity of the electrode 12.
Alternatively, the wlectrode 12 can be stamped o«t or ground ont from a piece of m~~.al.
An alternative embodiment of the invention ie shown in Fi~a 6 and 7 wherein the mounting ring 44 is not used and the ~roun~i electrode 12a is merely mounted nt a right angle 48a to a mountins post 38a which is spot welded to the edge 52a of a spark plug skirt 26a at the second end 42a. The first end 40a of post 38a is attached to the back end of Around electrode 12a.
The spark plug of Fibs 9 and 10 comprises a ground electrod~~
component 46 consisting of the rin~/open-rind shaped ground electrode 12 and three mounting posts 70 which are welded on the end surface of the shank skirt 26. Preferably the number of mounting posts 70 is three but this number may be decreased or increased.
According to the embodiment shown by Fi~a. 11 and 12, the component 66 is stamped out from n metal plate an3 the free end portions 71 of the mounting posts are slightly curved to be located in a plane parallel to the plane of the ring/open-ring ahape3 ground electrode.
The improved spark plug of this invention can be used in conventional internal combustion engines for automobiles, boats, r.irplanes, ia:~n-mowers and like articles ef manufacture. It also improves horsepower ir, dual plug cylinders and in combustion chambers with enhanced turbulence.
Claims (14)
1. An internal combustion engine spark plug comprising;
a metal housing at least partially enclosing an insulator containing a conductive centre electrode, which has a bottom portion in the form of a solid cylinder with a planar surface at an end distal from the insulator and extends from the insulator at a bottom end of the spark plug, the bottom end of the centre electrode being vertically spaced by about 0.89 to 1.22 mm from a ground electrode attached to the metal housing, said ground electrode having an open ring shaped firing portion attached to the metal housing by at least one integral mounting post, said portion having a gap of 0-2.5 mm, a top of the firing portion of the ground electrode is fixed at a distance from and parallel to the bottom planar surface of the centre electrode, an inner annular circumference of the ground electrode is concentric with the centre electrode, the ground electrode inner diameter is substantially equal to the exterior diameter of the centre electrode, and a firing pattern from the centre electrode forms an annular ring pattern around the top of the ground electrode firing portion.
a metal housing at least partially enclosing an insulator containing a conductive centre electrode, which has a bottom portion in the form of a solid cylinder with a planar surface at an end distal from the insulator and extends from the insulator at a bottom end of the spark plug, the bottom end of the centre electrode being vertically spaced by about 0.89 to 1.22 mm from a ground electrode attached to the metal housing, said ground electrode having an open ring shaped firing portion attached to the metal housing by at least one integral mounting post, said portion having a gap of 0-2.5 mm, a top of the firing portion of the ground electrode is fixed at a distance from and parallel to the bottom planar surface of the centre electrode, an inner annular circumference of the ground electrode is concentric with the centre electrode, the ground electrode inner diameter is substantially equal to the exterior diameter of the centre electrode, and a firing pattern from the centre electrode forms an annular ring pattern around the top of the ground electrode firing portion.
2. A spark plug according to claim 1 wherein the ground electrode and the mounting post is integral with a mounting ring, which is in a plane parallel to the ground electrode and vertically spaced by at least one mounting post.
3. A spark plug according to claim 2, wherein the metal housing has a shank skirt at the lower end crimped over the mounting ring to position the ground electrode over the mounting ring.
4. A spark plug according to claim 1, wherein the insulator is a ceramic material.
5. A spark plug according to claim 1, wherein the inner diameter of the ground electrode is from 1 to 1.1 times the outer diameter of the centre electrode.
6. A spark plug according to claim 1, wherein three mounting posts are attached to the ground electrode.
7. A spark plug according to claim 1, wherein said gap has two parallel edges.
8. A spark plug according to claim 1, characterized in that the gap has two radial edges.
9. A spark plug according to claim 1, wherein each of the at least one integral mounting post is an L-shaped supporting bracket.
10. A spark plug according to claim 9, characterized in that one leg of the L-shaped supporting bracket is located in the plane of the ring shaped ground electrode.
11. A spark plug according to claim 1, characterized in that the ring shaped ground electrode is integral with and at a sharp right angle to each of the at least one integral mounting post, the mounting post being integral with a mounting ring at an end distal from the ground electrode, the mounting ring being in a plane parallel to the ring shaped ground electrode.
12. A spark plug according to claim 1, wherein the metal shell further comprises a lower end and a mounting ring attached to the lower end of the metal shell to hold the ground electrode in position.
13. A spark plug according to claim 1, wherein a back end of the ring shaped ground electrode is integral at a sharp right angle with a first end of each of the at least one integral mounting post, and where each of the at least one mounting post is integral with a mounting ring at a second end.
14. A spark plug according to claim 12, wherein the gap is diametrically opposite to one of the at least one integral mounting post.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42117289A | 1989-10-13 | 1989-10-13 | |
| US421,172 | 1989-10-13 | ||
| PCT/EP1990/001738 WO1991006142A1 (en) | 1989-10-13 | 1990-10-13 | Spark plug with a ring/open-ring shaped ground electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2044622A1 CA2044622A1 (en) | 1991-04-14 |
| CA2044622C true CA2044622C (en) | 2000-12-26 |
Family
ID=23669464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002044622A Expired - Fee Related CA2044622C (en) | 1989-10-13 | 1990-10-13 | Spark plug with ring shaped ground electrode |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0451264B1 (en) |
| JP (1) | JPH04503731A (en) |
| AT (1) | ATE132304T1 (en) |
| CA (1) | CA2044622C (en) |
| DE (1) | DE69024480T2 (en) |
| WO (1) | WO1991006142A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19705372C2 (en) * | 1997-02-12 | 2002-06-27 | Beru Werk Ruprecht Gmbh Co A | Spark plug for an internal combustion engine |
| DE102004011588A1 (en) * | 2004-03-10 | 2005-09-29 | Robert Bosch Gmbh | Sparking plug, has V-slot on lateral surface of ground/earth electrode |
| TW201001854A (en) * | 2008-06-26 | 2010-01-01 | chen-jun Liao | Spark plug |
| US8584648B2 (en) | 2010-11-23 | 2013-11-19 | Woodward, Inc. | Controlled spark ignited flame kernel flow |
| 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 |
| KR101227903B1 (en) | 2011-08-29 | 2013-02-06 | 우진공업주식회사 | Spark plug for internal combustion engine |
| US9856848B2 (en) | 2013-01-08 | 2018-01-02 | Woodward, Inc. | Quiescent chamber hot gas igniter |
| US9765682B2 (en) | 2013-06-10 | 2017-09-19 | Woodward, Inc. | Multi-chamber igniter |
| US8839762B1 (en) | 2013-06-10 | 2014-09-23 | Woodward, Inc. | Multi-chamber igniter |
| US9653886B2 (en) | 2015-03-20 | 2017-05-16 | Woodward, Inc. | Cap shielded ignition system |
| EP3271561B1 (en) | 2015-03-20 | 2018-12-12 | Woodward, Inc. | Parallel prechamber ignition system |
| US9890689B2 (en) | 2015-10-29 | 2018-02-13 | Woodward, Inc. | Gaseous fuel combustion |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2298504A (en) * | 1940-06-10 | 1942-10-13 | Frederick A Ost | Spark plug |
| FR945476A (en) * | 1941-10-11 | 1949-05-05 | Bendix Aviat Corp | Spark plug and its manufacturing process |
| FR1134688A (en) * | 1955-11-07 | 1957-04-16 | Floquet | Spark plug |
| EP0167687A1 (en) * | 1984-07-10 | 1986-01-15 | Wen-Tu Wang | A spark plug with a ring-shaped ground electrode |
| FR2612346A1 (en) * | 1987-03-13 | 1988-09-16 | Bernies Francis | Conversion of a conventional sparkplug into an adjustable, enclosed 7,8 semi-annular sparkplug |
-
1990
- 1990-10-13 AT AT91900245T patent/ATE132304T1/en not_active IP Right Cessation
- 1990-10-13 EP EP91900245A patent/EP0451264B1/en not_active Expired - Lifetime
- 1990-10-13 DE DE69024480T patent/DE69024480T2/en not_active Expired - Fee Related
- 1990-10-13 CA CA002044622A patent/CA2044622C/en not_active Expired - Fee Related
- 1990-10-13 JP JP3500623A patent/JPH04503731A/en active Pending
- 1990-10-13 WO PCT/EP1990/001738 patent/WO1991006142A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| DE69024480D1 (en) | 1996-02-08 |
| EP0451264A1 (en) | 1991-10-16 |
| JPH04503731A (en) | 1992-07-02 |
| ATE132304T1 (en) | 1996-01-15 |
| DE69024480T2 (en) | 1996-05-15 |
| EP0451264B1 (en) | 1995-12-27 |
| CA2044622A1 (en) | 1991-04-14 |
| WO1991006142A1 (en) | 1991-05-02 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |