JPH0730493U - Improved spark plug - Google Patents

Abstract

(57) [Summary] [Purpose] By effectively improving the combustion efficiency by improving the performance of the spark plug used for the engine, liquid fuel and gas fuel, which are finite resources on the earth, can be effectively used, and at the same time, living organisms from exhaust gas and Providing an improved spark plug aiming to further reduce harmful substances to the natural environment. [Structure] A hollow hole 4 is formed at the center of a center electrode 5 of a spark plug, and at the same time, an outer electrode 2 positioned opposite to and covering the center electrode 5 penetrates through the same shape as the hole 4 formed in the center electrode. The hole 3 is provided at the same position. Due to this structure, the gas coming from the spark plug axial direction also passes through the through hole 3 provided in the outer electrode 2 and is generated between the central electrode peripheral portion 1 and the peripheral portion of the through hole 3 provided in the outer electrode 2. Enter the center of the circular spark and ignite it securely. Further, even if the gas arrives at 90 ° in the lateral direction with respect to the spark plug axis, sparks occur in the central electrode peripheral portion 1 which is the outer portion of the central electrode 5, so that the ignitability is improved.

Description

[Detailed description of the device] [Industrial applications]

 The present invention mainly relates to a spark plug used for engines of automobiles, motorcycles, trains, aircrafts, ships, etc.

[Prior art]

 The shape of the engine spark plug that has been used in the past is a flat shape in which a thin cylinder is cut at the tip of the center electrode, and an outer electrode with a narrow rectangular cross-section covers the tip of the center electrode. The one that has been placed in the building to form a spark gap has been used as a mainstream for many years. The disadvantage of this type of spark plug is that the spark, which is the ignition source for igniting the compressed gas in the engine cylinder, is structurally generated inside the outer electrode that covers the center electrode. It was not the ideal spark position.

[Problems to be solved by the device]

 Since the spark position for the gas of the conventional plug described above occurs inside the outer electrode, which is covered by the outer electrode, if a large amount of rich gas instantaneously reaches this part when the engine is started or during rapid acceleration, it may cause a fire. Even if the plug structure is apt to be affected by changes in the air-fuel ratio, the insulation of the center electrode will be incompletely burned before touching the sparks and the temperature will drop, resulting in a decrease in insulation and a phenomenon called so-called plug fogging of ignition failure. there were.

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and its purpose is to prevent ignition even when a large amount of rich gas momentarily reaches the plug portion at the time of engine start or sudden acceleration. Since the structure is such that the gas first comes into contact with the spark, the conventional plug accepts gas only from the direction perpendicular to the spark action direction, but the plug of the present invention does not accept it only from the direction perpendicular to it. The problem was solved by providing a through hole in the outer electrode spark surface part that covers the center electrode spark part so as to send the gas to the spark part and improve the ignitability of the gas. At the same time, by forming a recessed hole in the same shape and in the same line as the through hole of the outer electrode facing the central electrode tip spark surface, the spark that is a fire occurs in a cylindrical shape at the outer peripheral part of the central electrode shaft. Therefore, the structure is designed to instantly ignite the gas coming from the same direction as the spark direction and the gas coming from the direction perpendicular to the spark.

[Action]

 As already mentioned above, no matter which direction the rich gas momentarily reaches the spark part of the plug when the engine is started or when it is suddenly accelerated, it is easy for the gas to come into contact with the spark, which is the ignition source. By making a through hole toward the center electrode in the spark part of the outer electrode of the structure part that covers the structure, and forming a recess in the center part of the center electrode at the same time, a spark was circumferentially formed around the center electrode. With this structure, the incoming gas from the axial direction of the plug is sent into the middle of the circumferential spark through the through holes provided in the outer electrode and ignited. Even so, ignition is improved because there is a spark around the outside of the center electrode.

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. 1 shows an embodiment of claim 1, FIG. 2 shows an embodiment of claim 2, and FIG. 3 shows an embodiment of claim 3. FIG. 1 shows an improved plug in which a through hole 3 is provided only in the portion of the outer electrode 2 as described in claim 1. The cross-sectional shape of the outer electrode 2 is rectangular, but if a rectangular material that is slightly wider than that used for normal plugs is used, the strength around the through hole 3 due to the provision of the through hole 3 can be improved. It is possible to compensate for the decrease and the decrease in durability, and depending on the design, only the periphery of the through hole 3 of the outer electrode rectangular material may be reinforced with a rounded and outwardly bulging shape. In addition, since the conventional plug dislikes the structure that interferes with the arrival of the gas flow from the central axis direction to the spark point, the shape of the outer electrode 2 tends to be as narrow as possible in order to improve the performance. However, in the present invention, even if this point is wide, since there is a through hole 3 provided in the outer electrode 2, it is possible to smoothly reach the spark of the spark directly without any obstruction from the gas coming from the central axis direction. Become. In this case, the sharp edge on the circumference of the through hole 3 provided in the outer electrode 2 has the effect of facilitating the occurrence of sparks, and at the same time, causes a circumferential and cylindrical spark along the circumference of the through hole 3 to occur. Since the gas is sent to the center, the ignitability is good. Sparks also occur in the vicinity of the through hole 3 even for gas coming from the lateral direction, and as a result, sparks occur relatively outside the center electrode 5 and the ignitability becomes good. Next, the embodiment of claim 2 and the description of FIG. 2 will be described. In this case, the outer electrode 2 has the same shape as the conventional spark plug, and the through hole 3 shown in FIGS. 1 and 3 is not provided. However, in FIG. 2 this time, there is a recess hole 4 provided in the center electrode 5 which was not provided in the center electrode 5 in FIG. The ignitability of the gas coming from the lateral direction is improved by causing it to occur outside the central electrode, and at the same time, the sharp edge portion around the recessed hole 4 provided in the central electrode facilitates sparking. It also had an effect. Finally, the description of the third embodiment and FIG. In claim 3 of this figure, the effect of the function of claim 1 and the function and effect of claim 2 are simultaneously implemented, and the one described in the embodiment of claims 1 and 2 is one spar. This is an embodiment realized simultaneously in the plug.

[Effect of device]

 As described above, in the conventional spark plug, the gas that came relatively favorably from only the lateral direction of the X-axis to the plug was guided to the spark portion and ignited. However, in the present invention, the gas comes from the Y-axis direction that is the central electrode direction of the plug. On the other hand, the ignition performance is improved compared to the conventional type because the structure is such that the spark is directly satisfactorily ignited and at the same time, the spark is generated in the outer peripheral portion of the center electrode even for the gas coming from the X-axis direction. In other words, in the conventional spark plug, the spark was directly ignited only for the gas coming from the X-axis direction, but in the spark plug of the present invention, the spark was ignited also in both the X-axis and Y-axis directions. The structure has been improved so that the sparks will ignite directly. Ignition performance is improved and approaches even more complete combustion. As a result, the performance of the engine using the spark plug of the present invention is improved and efficiency is improved. Improving the performance of the spark plugs used in the engines of various transportation systems leads directly to the improvement of the engine performance, and the more efficient engine is the liquid fuel, which is a limited and precious resource on the earth. It will save gas fuel. By using the improved spark plug of the present invention in the engine of various transmission engines, not only the engine performance is improved and more comfortable running performance is obtained, but also the fuel consumption is reduced, resulting in the saving of global resources. At the same time, it is also effective in reducing exhaust gas pollution, which adversely affects the natural environment.

[Brief description of drawings]

FIG. 1 is an embodiment of claim 1 of the present invention.

FIG. 2 is an embodiment of claim 2 of the present invention.

FIG. 3 is an embodiment of claim 3 of the present invention

[Explanation of symbols]

 1, 2 and 3, inner 1 peripheral part of the center electrode 2 outer electrode 3 through hole 4 recessed hole provided in the center electrode 5 center electrode 6 center electrode insulating part 7 center electrode terminal part

Claims (3)

[Scope of utility model registration request] 1. A ignitability is improved by forming a hole penetrating on the extension line of the center part of the center electrode of the outer electrode tip part surface for sparking in pairs with the center electrode of the spark plug used in the engine. Spark plug. 2. A spark plug having improved ignition performance by providing a recessed hole in the center portion of the spark surface facing the outer electrode at the tip of the center electrode of the spark plug used in the engine. 3. Ignition by applying the device described in claim 1 to the outer electrode of a spark plug used in an engine and applying the device described in claim 2 to the center electrode of the spark plug at the same time for one plug. Spark plug with improved performance.