JP3008536U - Spark plug - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a spark plug that can ignite in all directions and is of multiple ignition type. A center electrode, a housing, an insulator, etc. are provided, an annular outer electrode is provided directly on the lower end of the male screw of the housing in place of the protruding outer electrode, and the outer periphery of the electrode head at the lower end of the center electrode and the inner portion of the annular outer electrode are provided. One gap is formed between the circumferences, the end surface of the insulator covering the outer circumference of the electrode head is provided higher than the end surface of the annular outer electrode, and the end surfaces of the electrode head and the insulator are extended downward to increase the length. Accordingly, one or more single or parallel plural annular conductive rings are provided on the outer circumference of the insulator, or the head of the insulator covering the lower end of the center electrode has a stepped cylindrical shape composed of parts having different diameters. A conductive ring may be provided on the outer circumference of each staircase, and multiple ignition is enabled by the above.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a kind of spark plug, which can perform ignition without blind spots in all directions without providing an outer electrode, and combines multiple ignition functions such as double, triple, quadruple or quintuple type. The present invention relates to a spark plug capable of completely burning a mixed gas and having an effect of increasing horsepower and reducing waste gas pollution.

[0002]

[Prior art]

 The spark plug has its ignition end installed in the fuel chamber, and as shown in Fig. 1, a high-voltage current is passed to generate a spark between the electrodes, which ignites the mixed gas in the combustion chamber to generate power. It is used for doing. As shown in FIG. 2, the structure of a general spark plug mainly has a central electrode (1), a housing (2), a protruding outer electrode (3), an insulator (4) and the like. The center electrode (1) is made of nickel alloy or platinum, and can withstand high temperature and high pressure. The center electrode (1) is insulated from other parts by using the insulator (4), and the spark plug high voltage wire is connected to the upper end of the electrode. A hexagonal nut (201) is formed on the upper part of the housing (2) for convenient installation and removal, and a male screw (202) is installed on the lower part for rotation on the engine. The protruding outer electrode (3) functions as a peripheral electrode and communicates with the engine. The insulator (4) surrounds the center electrode (1) and thus prevents leakage of high voltage current. A gasket made of copper, asbestos, etc. is provided in the insulator (4) to prevent gas leakage between the insulator (4) and the housing (2), and to secure a large tightening force when installing the spark plug. Prevent the insulator (4) from bursting. The upper end of the insulator (4) is generally formed with an uneven spline (401) to obtain an excellent insulating effect and to easily dissipate heat.

The above-mentioned spark plug ignites a mixed gas with a spark generated between the electrode head (101) of the center electrode (1) and the protruding outer electrode (3). The spark generated by the spark plug does not come into direct contact with the mixed gas in the combustion chamber due to the obstruction of the electrode (3), which causes the combustion efficiency of the mixed gas in the combustion chamber to be poor and fully exerts power. There was a problem that I could not. Further, since the accumulated coal is always generated on the protruding outer electrode (3) of the conventional spark plug, which may cause a non-ignition phenomenon due to the excess accumulated coal, which shortens the life of the spark plug. .

In order to solve the above-mentioned drawbacks of the conventional spark plug having a protruding outer electrode, a kind of spark plug having no protruding outer electrode (shown in FIGS. 3 and 4) has been devised. It was The spark plug has the same parts as the center electrode (1), the housing (2), and the insulator (4) as the above spark plug, but the lower end of the male screw (202) of the above housing (2) is protruded to the outside. The ring-shaped outer electrode (203) is provided directly on the lower end of the male screw (202) of the housing (2) without being connected to the electrode (3), and the ring-shaped outer electrode (203) is replaced by the protruding outer electrode (3), An insulator (1) that forms a gap between the outer diameter of the electrode head (101) of the electrode (1) and the inner diameter of the annular outer electrode (203) at the lower end of the housing (2) to cover the periphery of the electrode head (101). The end face (403) of 4) is provided higher than the end face (204) of the annular outer electrode (203), thereby preventing energization of the electrode head (101) and the inner diameter portion of the annular outer electrode (203). In the spark plug, the electrode head (101) of the central electrode (1) emits a spark toward the annular outer electrode (203) of the surrounding housing (2) by a high-voltage current, which burns the mixed gas to generate power. To do. This is not disturbed by the protruding outer electrode, has a good spark explosive force, and can show comparatively good power during rapid operation, completely explodes the mixed gas, and has no disadvantages of accumulated coal. . However, the explosive force of this spark plug was finite, and it could not be said that it was in the best condition.

[0005]

[Problems to be solved by the device]

 The present invention relates to a spark plug which does not have a kind of protruding outer electrode, and in particular, extends the electrode head of the center electrode of the spark plug and the end surface of the insulator downward, so that one to three wires are provided on the outer circumference of the insulator. It is an object to provide multiple parallel ring-shaped conductive rings to enable multiple ignition.

[0006]

[Means for Solving the Problems]

 The present invention includes a center electrode, a housing, an insulator, etc., and instead of the protruding outer electrode, an annular outer electrode is provided directly on the lower end of the male screw of the housing, and the outer periphery of the electrode head at the lower end of the center electrode is One gap is formed between the inner circumferences of the annular outer electrodes, and the end surface of the insulator covering the outer circumference of the electrode head is provided higher than the end surface of the annular outer electrode.

The electrode head of the center electrode and the end surface of the insulator are extended downward to increase the length thereof, so that one or more single or parallel annular conductive rings are provided on the outer circumference of the insulator to provide multiple points. Characterized by the ability to make a fire.

The head of the insulator covering the lower end of the center electrode may have a stepped cylindrical shape composed of portions having different diameters, and a conductive ring may be installed around each staircase.

[0009]

[Action]

 The present invention is capable of igniting in all directions and blind spots due to the design without protruding outer electrodes, and has a multiple ignition function such as double, triple, quadruple or quintuple.

[0010]

【Example】

 5 and 11 show a double ignition type embodiment of the present invention. The present invention has a center electrode (1), a housing (2), an insulator (4), etc. The center electrode (1) is insulated from the other parts by using the insulator (4), and is attached to the upper end of the electrode. Connects the spark plug high voltage line. A hexagonal nut (201) is formed on the upper part of the housing (2) for convenient installation and removal, and a male screw (202) is provided on the lower part for rotation on the engine. The insulator (4) surrounds the core electrode (1) and thus prevents leakage of high voltage current. A gasket such as copper and asbestos is provided in the insulator (4) to prevent gas leakage between the insulator (4) and the housing (2), and when the insulator is installed on the spark plug, the tightening force is too large and the insulator is too large. Prevent (4) from bursting. The upper end of the insulator (4) generally forms an uneven spline (401). The present invention is also a spark plug that does not connect the lower end of the male screw (202) of the housing (2) to the protruding outer electrode, that is, does not have a kind of protruding outer electrode. The outer circumference of the electrode head (101) of the central electrode (1) is surrounded by the head (402) of the insulator (4), and the head (402) has a conical shape, and the outer circumference and the housing (2) A gap (B) is formed between the inner diameters of the lower annular outer electrodes (203). The end face (403) of the head (402) of the insulator (4) covering the electrode head (101) and its periphery is provided higher than the end face (204) of the annular outer electrode (203). Moreover, the electrode head (101) is projected from the end face (403).

A feature of the present invention is that a single conductive ring (5) is provided parallel to the outer circumference of the head (402) of the insulator (4), and the conductive ring (5) is attached to the end surface (204) of the housing (2). ) And the electrode head (101) of the central electrode (1), and one gap (A), (B) at a position where the conductive ring (5) and the electrode head (101) and the end face (204) are closest to each other. Is to form. The gaps (A) and (B) are for generating sparks. Therefore, a double ignition spark plug is used to further increase the explosive force.

Similarly, according to the present invention, the electrode head (101) of the center electrode (1) and the end face (403) of the insulator (4) are extended downward, and two annular conductive rings (6) are provided. They may be provided in parallel at intervals (as shown in FIGS. 6 and 12). A spark may be generated in this order in the gaps (C), (D), and (E) formed to form a spark plug of a triple ignition type.

Further, as shown in FIGS. 7 and 13, the electrode head (101) of the center electrode (1) and the end surface (403) of the insulator (4) are extended downward to form three or more annular conductive rings. (7) may be provided in parallel and at intervals, whereby the spaces (F), (G), (H). ． ． A spark may be generated in this order and a spark plug of multiple ignition type of four or more types may be used.

Of course, if the center electrode (1) extends too much into the combustion chamber, the piston head may collide with the spark plug and be damaged, so that the length of the downward extension is restricted. Generally, a large number of conductive rings should be one to three to prevent the center electrode from becoming too long.

Further, as shown in FIG. 8 to FIG. 10, the head (402) of the insulator (4) covering the lower end of the center electrode (1) of the present invention may have a stepped columnar shape having different diameter portions. Of course, in this case, one conductive ring is provided on the outer circumference of one staircase, and the effect of multiple ignition can be obtained as in the above-described embodiment.

[0016]

[Effect of device]

 The present invention is capable of igniting in all directions and blind spots due to the design without protruding outer electrodes, and has the function of multiple ignition such as double, triple, quadruple or quintuple, and complete mixing of mixed gas. It has effects such as burning, increasing horsepower and reducing waste gas pollution.

[Brief description of drawings]

FIG. 1 is a side view showing a state where a conventional spark plug is attached to a cylinder.

FIG. 2 is a perspective view in which a part of a conventional spark plug is cut away.

FIG. 3 is a perspective view of a conventional spark plug having no protruding outer electrode.

FIG. 4 is a cross-sectional view of a conventional spark plug having no protruding outer electrode.

FIG. 5 is a sectional view of a double ignition type embodiment of the spark plug of the present invention.

FIG. 6 is a sectional view of a triple ignition type embodiment of the spark plug of the present invention.

FIG. 7 is a sectional view of a quad ignition type embodiment of the spark plug of the present invention.

FIG. 8 is a sectional view of another embodiment of the double ignition type spark plug of the present invention.

FIG. 9 is a cross-sectional view of another embodiment of the triple ignition type spark plug of the present invention.

FIG. 10 is a sectional view of another embodiment of the spark plug of the present invention, which is of a quadruple ignition type.

11 is a side view of the embodiment of FIG. 5 described above.

12 is a side view of the embodiment of FIG. 6 above.

13 is a side view of the embodiment of FIG. 7 described above.

[Explanation of symbols]

1 ... Center electrode 101 ... Electrode head 2 ...
・ Housing 201 ・ ・ ・ Hexagon nut 202 ・ ・ ・
Male screw 203 ... Annular outer electrode 204 ... End face 3 ... Projected outer electrode 4 ... Insulator
401 ... Spline 402 ... Head 403
... End faces 5, 6, 7 ... Conductive ring

Claims (2)

[Scope of utility model registration request] 1. A center electrode, a housing, an insulator and the like are included, and an annular outer electrode is directly provided on a lower end portion of the male screw of the housing, and is replaced with a conventional protruding outer electrode,
One gap is formed between the outer circumference of the electrode head at the lower end of the center electrode and the inner circumference of the annular outer electrode, and the end surface of the insulator covering the outer circumference of the electrode head is provided higher than the end surface of the annular outer electrode, Performing multiple ignition by extending downward by extending the electrode head of the center electrode and the end face of the insulator, and thus providing one or more single or parallel annular conductive rings on the outer periphery of the insulator. Characterized by,
Spark plug. 2. The spark according to claim 1, wherein a head of the insulator covering the lower end of the center electrode has a stepped cylindrical shape having portions of different diameters, and a conductive ring is provided on the outer circumference of each step. plug.