GB2031514A - Sparking plugs - Google Patents
Sparking plugs Download PDFInfo
- Publication number
- GB2031514A GB2031514A GB7848403A GB7848403A GB2031514A GB 2031514 A GB2031514 A GB 2031514A GB 7848403 A GB7848403 A GB 7848403A GB 7848403 A GB7848403 A GB 7848403A GB 2031514 A GB2031514 A GB 2031514A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gasket
- plug
- body portion
- apertures
- sparking
- 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.)
- Withdrawn
Links
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 239000000446 fuel Substances 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- H01T13/02—Details
- H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Spark Plugs (AREA)
Abstract
A sparking plug is designed to overcome the problems resulting from insufficient air flow into a combustion cylinder, such as carbon deposits, knocking, high fuel consumption, by including a specially shaped gasket 3 between the main body portion 1 and the screw- threaded portion 2, and apertures 11, 31 respectively in either or both of the body portion 1 and gasket 3. When the plug is in an operative position these apertures allow atmospheric air to be drawn into the combustion cylinder through the leak paths adjacent the thread of the screw-threaded portion 2 whereas when the gas within the cylinder is compressed escape of the gas does not occur. <IMAGE>
Description
SPECIFICATION
Sparking plug
The sparking plug is an important machine part in the present industrial society, being required in a large proportion of all automobiles, motorcycles, power engines etc. The widespread use and development of such engines has resulted in numerous attempts to develop and improve the conventional sparking plug.
The structure of the sparking plug has an important effect on the efficient generation of power; the ignition gap, length of the screwthreaded portion, nature of the electrodes and materials for making the spark plug body can all directly or indirectly affect the effectiveness of the plug. Sparking plug malfunctions such as absence of ignition or inadequate ignition leading to incomplete combustion, accumulated carbon deposit, undesirable cylinder operation, reduced power, knocking and short engine life are frequently encountered.
In order to better the above-mentioned drawbacks, the spark plug manufacturers have deliberatively studied various structures of new model spark plug but their achievement leaves much to be desired.
It is well-known that the fuel in the cylinder has to be completely burnt to achieve maximum engine power. Thus, if the fuel in the cylinder is completey burnt, there is no carbon deposited, knocking can be avoided, fuel is saved and the engine life is prolonged. In order to achieve complete combustion, there must be adequate air in the combustion chamber. The drawback of sparking plugs in general is that only an extremely small quantity of air can enter into the combustion chamber and it is insufficient to meet with the requirement for an efficient power stroke. Furthermore, during the piston compression stroke, the compressed gas will escape through the clearance in the screw thread of the sparking plug and thus the cylinder cannot be hermetically sealed.Therefore our attempt to improve the spark plug is directed towards the supply of combustion-promoting air and a gas-sealing action.
According to the present invention there is provided a sparking plug having a body portion, a screw-threaded portion and a gasket mounted on the plug between them and having a tapered inner peripheral part, at least one of the body portion and gasket including one or more apertures which, when the plug is screwed into a suitable threaded hole allow gas to be drawn past the gasket through the leak path adjacent the thread of the screw-threaded portion.
Preferably the gasket has said apertures which are inwardly downward sloping grooves in the face of said gasket adjacent said body portion and providing the said tapered inner peripheral part.
An embodiment of the invention will now be described with reference to the accompanying drawing which shows a side elevation of a sparking plug and a perspective view of a gasket.
The sparking plug has a body portion 1, screw threaded portion 2 and intermediate gasket 3; the position of the gasket 3 in the assembled plug is shown by chain-dotted lines.
The body portion 1 has several apertures in the form of grooves 11 which extend into a plain neck portion 4 between the screw-threaded portion 2 and the body portion 1. The gasket 3 has an frustoconical inner peripheral surface and several inwardly and downwardly sloping grooves 31. The numbers of grooves 11 and 31 may vary; in this embodiment they are the same but need not necessarily be so.
When the plug is in use the screw-threaded portion 2 is screwed into a combustion piston cylinder. The withdrawal of the piston in the cylinder during the induction stroke causes air from the surrounding atomosphere to be sucked in through the apertures 11 and 31 and through the leak path adjacent the screw-threaded portion 2 into the cylinder. When the piston is in the compression stroke loss of gas from the cylinder does not accur.
Sufficient air is sucked in to the cylinder to result in complete combustion of the fuel gas on sparking thus producing maximum power output for minimum fuel consumption. In addition, the suffieient supply of combustion air means that there is no carbon deposited on the sparking elements and the plug is not subject to clogging which would reduce its useful lifetime.
Sparking plugs according to the invention have undergone repeated testing giving the following results: (%)
Test Mileage Fuel Used Mileage per More mileage than that of Fuel
No. (km) Cubic Litre Cubic litre using conventional spark plug saved 1 170 23.6 7.21 2.01 38% 2 200 32.0 6.25 1.05 20% 3 220 32.3 6.80 1.60 30% 4 250 35.7 7.00 1.80 34% 5 270 39.7 6.79 1.59 31% 6 280 41.3 6.79 1.59 31% 7 300 45.4 6.61 1.41 27.70% As seen in this table the new sparking plug is able to produce a fuel saving of up to about 40% compared with conventional sparking plugs.
Claims (5)
1. A sparking plug having a body portion, a screwthreaded portion and a gasket mounted on the plug between them and having a tapered inner peripheral part, at least one of the body portion and the gasket including one or more apertures which, when the plug is screwed into a suitable threaded hole, allow gas to be drawn past the gasket through the leak path adjacent the thread of the screwthreaded portion.
2. A sparking plug according to claim 1 wherein the gasket has said apertures which are inwardly downward sloping grooves in the face of said gasket adjacent said body portion and providing the said tapered inner peripheral part.
3. A sparking plug according to claim 1 or claim 2, wherein the body portion has said apertures which are grooves which extend to lie within the gasket.
4. A sparking plug according to any one of the preceding claims wherein the gasket is tapered frustoconically around all of its inner periphery.
5. A sparking plug substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95043578A | 1978-10-11 | 1978-10-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2031514A true GB2031514A (en) | 1980-04-23 |
Family
ID=25490423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7848403A Withdrawn GB2031514A (en) | 1978-10-11 | 1978-12-13 | Sparking plugs |
Country Status (3)
| Country | Link |
|---|---|
| GB (1) | GB2031514A (en) |
| IT (1) | IT1162309B (en) |
| NL (1) | NL7812610A (en) |
-
1978
- 1978-12-13 GB GB7848403A patent/GB2031514A/en not_active Withdrawn
- 1978-12-28 NL NL7812610A patent/NL7812610A/en not_active Application Discontinuation
-
1979
- 1979-04-27 IT IT48867/79A patent/IT1162309B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| NL7812610A (en) | 1980-04-15 |
| IT7948867A0 (en) | 1979-04-27 |
| IT1162309B (en) | 1987-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |