GB2032516A – Sparking plug
– Google Patents
GB2032516A – Sparking plug
– Google Patents
Sparking plug
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Info
Publication number
GB2032516A
GB2032516A
GB7848402A
GB7848402A
GB2032516A
GB 2032516 A
GB2032516 A
GB 2032516A
GB 7848402 A
GB7848402 A
GB 7848402A
GB 7848402 A
GB7848402 A
GB 7848402A
GB 2032516 A
GB2032516 A
GB 2032516A
Authority
GB
United Kingdom
Prior art keywords
electrode
sparking
plug
earth
earth electrode
Prior art date
1978-10-25
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.)
Withdrawn
Application number
GB7848402A
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.)
1978-10-25
Filing date
1978-12-13
Publication date
1980-05-08
1978-12-13
Application filed by Individual
filed
Critical
Individual
1980-05-08
Publication of GB2032516A
publication
Critical
patent/GB2032516A/en
Status
Withdrawn
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H01T13/46—Sparking plugs having two or more spark gaps
H01T13/467—Sparking plugs having two or more spark gaps in parallel connection
Abstract
A sparking plug comprises a disc- shaped earth electrode (8) having a central aperture into which the end of a central electrode (7) extends, leaving a gap (9) between the electrodes across which sparking occurs in a radial direction. The innermost edge of the earth electrode (8) may be circular as shown, or shaped so as to produce tongues which extend towards the central electrode (7).
Description
SPECIFICATION
Sparking plug with circular earth electrode
In the known type of sparking plug the earth electrode is a metal strip bent inwardly beneath the central electrode with a certain gap, the size of which is calculated according to the fuel mixture, across which sparking occurs. Since the metal strip electrode has a relatively small tip it is readily coated with carbon ash and other dust which can interfere with regular sparking of the sparking plug after a certain period of sparking and must be eliminated for efficient further use. In addition, the limited size of the strip results in poor heat emission from the electrode, producing temperature rises which might affect regular sparking of the sparking plug.
In the present invention, the sparking plug has a disc-shaped earth electrode around the end of the central electrode which extends into an aperture in the disc-shaped electrode so that there is an annular gap between the central electrode and the earth electrode across which sparking occurs. The inner edge of the earth electrode may be shaped so as to adjust the nature or size of the gap and to increase the area of the earth electrode onto which a spark will be attracted.
Thus, according to this invention there is provided a sparking plug having, a central electrode extending longitudinally through the plug and an earth electrode, the earth electrode defining a central aperture into which the central electrode extends.
Preferably the aperture of the earth electrode is shaped so as to provide one or more tongues which extend inwardly towards the central electrode further than the sections of the innermost edge which interconnect these portions.
The relatively larger area of disc-shaped earth electrode makes carbon deposits more thinly distributed over the electrode surface so that the electrical resistance to sparking rises only slowly, enabling the sparking plug to maintain regular sparking over a much longer period. Furthermore, larger size of the earth electrode facilitates the emission of heat so that the temperature of the earth electrode as held constant thereby encouraging regular sparking of the plug.
An embodiment of the invention will now be described with reference to the accompanying drawings wherein,
Fig. 1 is a side elevation partly in cross-section of a sparking plug with a plan view of its
lowermost surface as seen from below and
Figs. 2 and 3 show plan views of the lower
most surface of a sparking plug having modified earth electrodes.
As seen in Fig. 1 , the sparking plug has a body portion, a screw-threaded portion 6, with a washer 10 and a central electrode 7 which extends through the plug and beyond the end of the screw-threaded portion. The body portion comprises a screw cap 1, ceramic insulation 2, hexagonal nut 4 and metal body 5, all essentially as found in a conventional sparking plug.
The earth electrode is the disc-shaped element 8 which is secured to the end of the screwthreaded portion 6 and which has a central aperture into which extends the central electrode 7 so that it is surrounded by a gap 9. The.disc- shaped element 8 is in electrical contact with the screw-threaded portion 6 so that, on sparking, current created can pass through the screwthreaded portion 6 and metal body 5 of the plug to the engine block and ultimately to earth.
The spark gap 9 provides an adequate volume for a proper interchange of fuel/gas mixture before ignition.
Fig. 2 shows a modified earth electrode in which the inner most edge of the disc-shaped element 8 is shaped so as to provide three tongues 12 which extend inwardly towards the central electrode 7 further than the interconnecting sections of the innermost edge.
Qn sparking, the current takes the path of least electrical resistance and in this case the spark will cross from the central electrode 7 to a nearest part of the earth electrode 8 which is the inner most end of any of the tongues 12.
Fig. 3 shows an earth electrode which is similarly modified to produce four tongues 13.
With a conventional strip-shaped earth electrode’the end of the electrode which is axially spaced from the central electrode, and to which the spark will cross, is small and therefore quickly coated with carbon, making its electrical resistance much higher and therefore preventing regular sparking; this problem is avoided in the sparking plug described, in which sparking occurs radially. Furthermore, the relatively larger surface area of the disc-shaped earth elecrode will allow better dissipation of the heat formed in the electrode due to sparking so that any effect that a temperature rise in the electrode might have on the regularity and efficiency of the sparking is reduced.
1. A sparking plug having, a central electrode extending longitudinally through the plug and an earth electrode, the earth electrode defining a central aperture into which the central electrode extends.
2. A sparking plug according to claim 1 wherein the earth electrode is a disc-like element secured at one end of a body of the plug.
3. A sparking plug according to claim 1 or claim 2 wherein the aperture of the earth electrode is shaped so as to provide one or more tongues
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Sparking plug with circular earth electrode In the known type of sparking plug the earth electrode is a metal strip bent inwardly beneath the central electrode with a certain gap, the size of which is calculated according to the fuel mixture, across which sparking occurs. Since the metal strip electrode has a relatively small tip it is readily coated with carbon ash and other dust which can interfere with regular sparking of the sparking plug after a certain period of sparking and must be eliminated for efficient further use. In addition, the limited size of the strip results in poor heat emission from the electrode, producing temperature rises which might affect regular sparking of the sparking plug. In the present invention, the sparking plug has a disc-shaped earth electrode around the end of the central electrode which extends into an aperture in the disc-shaped electrode so that there is an annular gap between the central electrode and the earth electrode across which sparking occurs. The inner edge of the earth electrode may be shaped so as to adjust the nature or size of the gap and to increase the area of the earth electrode onto which a spark will be attracted. Thus, according to this invention there is provided a sparking plug having, a central electrode extending longitudinally through the plug and an earth electrode, the earth electrode defining a central aperture into which the central electrode extends. Preferably the aperture of the earth electrode is shaped so as to provide one or more tongues which extend inwardly towards the central electrode further than the sections of the innermost edge which interconnect these portions. The relatively larger area of disc-shaped earth electrode makes carbon deposits more thinly distributed over the electrode surface so that the electrical resistance to sparking rises only slowly, enabling the sparking plug to maintain regular sparking over a much longer period. Furthermore, larger size of the earth electrode facilitates the emission of heat so that the temperature of the earth electrode as held constant thereby encouraging regular sparking of the plug. An embodiment of the invention will now be described with reference to the accompanying drawings wherein, Fig. 1 is a side elevation partly in cross-section of a sparking plug with a plan view of its lowermost surface as seen from below and Figs. 2 and 3 show plan views of the lower most surface of a sparking plug having modified earth electrodes. As seen in Fig. 1 , the sparking plug has a body portion, a screw-threaded portion 6, with a washer 10 and a central electrode 7 which extends through the plug and beyond the end of the screw-threaded portion. The body portion comprises a screw cap 1, ceramic insulation 2, hexagonal nut 4 and metal body 5, all essentially as found in a conventional sparking plug. The earth electrode is the disc-shaped element 8 which is secured to the end of the screwthreaded portion 6 and which has a central aperture into which extends the central electrode 7 so that it is surrounded by a gap 9. The.disc- shaped element 8 is in electrical contact with the screw-threaded portion 6 so that, on sparking, current created can pass through the screwthreaded portion 6 and metal body 5 of the plug to the engine block and ultimately to earth. The spark gap 9 provides an adequate volume for a proper interchange of fuel/gas mixture before ignition. Fig. 2 shows a modified earth electrode in which the inner most edge of the disc-shaped element 8 is shaped so as to provide three tongues 12 which extend inwardly towards the central electrode 7 further than the interconnecting sections of the innermost edge. Qn sparking, the current takes the path of least electrical resistance and in this case the spark will cross from the central electrode 7 to a nearest part of the earth electrode 8 which is the inner most end of any of the tongues 12. Fig. 3 shows an earth electrode which is similarly modified to produce four tongues 13. With a conventional strip-shaped earth electrode’the end of the electrode which is axially spaced from the central electrode, and to which the spark will cross, is small and therefore quickly coated with carbon, making its electrical resistance much higher and therefore preventing regular sparking; this problem is avoided in the sparking plug described, in which sparking occurs radially. Furthermore, the relatively larger surface area of the disc-shaped earth elecrode will allow better dissipation of the heat formed in the electrode due to sparking so that any effect that a temperature rise in the electrode might have on the regularity and efficiency of the sparking is reduced. CLAIMS
1. A sparking plug having, a central electrode extending longitudinally through the plug and an earth electrode, the earth electrode defining a central aperture into which the central electrode extends.
2. A sparking plug according to claim 1 wherein the earth electrode is a disc-like element secured at one end of a body of the plug.
3. A sparking plug according to claim 1 or claim 2 wherein the aperture of the earth electrode is shaped so as to provide one or more tongues
which extend inwardly towards the central
electrode further than the sections of the innermost edge which interconnects these
portions.
4. A sparking plug essentially as herein described with reference to and as illustrated in the accompanying drawings.
GB7848402A
1978-10-25
1978-12-13
Sparking plug
Withdrawn
GB2032516A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US95501178A
1978-10-25
1978-10-25
Publications (1)
Publication Number
Publication Date
GB2032516A
true
GB2032516A
(en)
1980-05-08
Family
ID=25496248
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7848402A
Withdrawn
GB2032516A
(en)
1978-10-25
1978-12-13
Sparking plug
Country Status (5)
Country
Link
DE
(1)
DE2854251A1
(en)
FR
(1)
FR2440100A1
(en)
GB
(1)
GB2032516A
(en)
IT
(1)
IT7947549D0
(en)
NL
(1)
NL7900091A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3934012A1
(en)
*
1988-10-26
1990-05-03
Ryohei Kashiwara
SPARK PLUG FOR USE IN COMBUSTION ENGINES AND IGNITION METHOD FOR THEIR USE
EP0408089A2
(en)
*
1984-02-27
1991-01-16
Hensley Plasma Plug Partnership dba HDI Research
Apparatus for initiating combustion of fuel-air mixtures in an internal combustion engine
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE102015114453B4
(en)
2014-09-01
2023-06-29
Denso Corporation
Spark plug for an internal combustion engine and method of manufacturing a spark plug
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR486864A
(en)
*
1917-09-18
1918-05-15
Guiseppe Antonio Pariani
Improvements made to spark plugs for combustion or internal combustion engines
FR498814A
(en)
*
1918-12-12
1920-01-23
Ets De Dion Bouton
Improvement in electric candles
GB1486560A
(en)
*
1973-11-29
1977-09-21
Ass Eng Ltd
Ignition devices
1978
1978-12-13
GB
GB7848402A
patent/GB2032516A/en
not_active
Withdrawn
1978-12-15
DE
DE19782854251
patent/DE2854251A1/en
active
Pending
1979
1979-01-05
NL
NL7900091A
patent/NL7900091A/en
not_active
Application Discontinuation
1979-01-05
FR
FR7900217A
patent/FR2440100A1/en
not_active
Withdrawn
1979-01-05
IT
IT4754979A
patent/IT7947549D0/en
unknown
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP0408089A2
(en)
*
1984-02-27
1991-01-16
Hensley Plasma Plug Partnership dba HDI Research
Apparatus for initiating combustion of fuel-air mixtures in an internal combustion engine
EP0408089A3
(en)
*
1984-02-27
1991-03-20
Hensley Plasma Plug Partnership Dba Hdi Research
Apparatus for initiating combustion of fuel-air mixtures in an internal combustion engine
DE3934012A1
(en)
*
1988-10-26
1990-05-03
Ryohei Kashiwara
SPARK PLUG FOR USE IN COMBUSTION ENGINES AND IGNITION METHOD FOR THEIR USE
Also Published As
Publication number
Publication date
DE2854251A1
(en)
1980-04-30
IT7947549D0
(en)
1979-01-05
FR2440100A1
(en)
1980-05-23
NL7900091A
(en)
1980-04-29
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Legal Events
Date
Code
Title
Description
1981-02-18
WAP
Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)
