GB2249345A

GB2249345A - Spark plug

Info

Publication number: GB2249345A
Application number: GB9023831A
Authority: GB
Inventors: Chin-Hsin Hsu
Original assignee: HSU CHIN HSIN
Current assignee: HSU CHIN HSIN
Priority date: 1990-11-02
Filing date: 1990-11-02
Publication date: 1992-05-06
Also published as: GB9023831D0

Abstract

The insulator 1, containing the central electrode 11, is located in a plug body formed in two separable parts 2, 3 connected by screw threads. A cover 6 extends over exterior flats on the pants 2, 3. The earth electrode 32 may take various forms (Figs. 4 to 6). <IMAGE>

Description

SPARK PLUG.

BACKGROUND OF THE INVENTION The present invention relates to a spark plug structure comprising a dielectric, ceramics, nut recess, nut cap, gasket, conductive disc, dustproof cap, spring and ring. The structure of the spark plug can easily and quickly be disintegrated into individual components. Thus, it provides the users to disintegrate the spark plug for cleaning and maintenance conveniently.

SUMMARY OF THE INVENTION It is the primary object of the present invention to provide a spark plug structure which assures smooth full ignition.

It is a second object of the invention to provide a spark plug structure which can cause atomizing effect and allows the cleaning of fuel contamination within the nut cap.

It is another object of the invention to provide a spark plug structure which reduces the accumulation of carbon and increases the ignition efficiency of fuel.

It is another object of the invention to provide a spark plug structure which allows complete combustion of fuel in the engine.

Additional objects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

BRIEF DESCRIPTION OF THE DRAWING The accompanying drawings which are incorporated in and constitute a part of the description of the invention, illustrate the best mode so far contemplated for carrying o:.t the invention, and serve to explain the principles of the invention.

Fig. 1 is an exploded view of the spark plug structure in accordance with the present invention; Fig. 2 is a sectional view of the spark plug in accordance with the present invention; Fig. 3 is a perspective view showing a cress-section of the spark plug structure in accordance with the present invention; Figs. 4 to 6 are preferred embodiments showing various configuration of nut cap in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the present preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings.

Referring now the Figs. 1 and 2, in particular to Fig.

1, it may be seen that the spark plug comprises an dielectric ceramics 1, nut recess 2, nut cap 3, gasket 4, conductive disc 5, dustproof cap 6, spring 7 and annular ring 8.

The dielectric ceramics 1 is made from dielectric material such as the ceramics, wherein a metal rod is enclosed as the center thereof. The upper end of the center rod is protruded to form a center electrode 11 and the lower end of the center rod is protruded to form a connector 12 for high voltage input.

The middle section of said dielectric ceramics is a center ring 13, and on the top of ring 13 is provided with a stepped ring 14.

The nut recess 2, having outer acrew threads 21 for acrew locking and formed at the outer ring edge, being mounted on the center ring 13 of said dielectric ceramics 1, the bottom end of said outer threads 21 being formed into a hexagonal bolt head 22.

The nut cap 3 is inserted to the top of the dielectric ceramics 1 and is formed as one unit from metallic material.

The interior of the nut cap 3 is hollow and the top of the cap 3 is formed into arch shaped electrode 32. The external surface of the middle region of the nut cap 3 is provided with outer screw threads 33 so as to screw onto the cylinder of engine. The lower region of the nut cap 3 is machined to form a hexagonal bolt head 34, wherein the interior surface of the bolt head 34 is provided with inner screw threads (not shown) which can be screwed tight onto the outer screw thread 21 of the nut recess 2.

The gasket 4 is mounted within the interior of the bolt head 34. When the nut cap 3 is combined with the nut recess 2, the gasket 4 is positioned in between the bolt head 34 and the center ring 13 of the dielectric ceramics 1 so as to prevent the leaking of air.

The conductive disc 5 is substantially an annular ring mounted at the external circumference of the nut cap 3. A branched element 51 is attached to the disc 5 for grounding connection.

The spring 7 and the annular ring 8 are inserted onto the dielectric ceramics 1, wherein the lower end of the spring 7 touches the stepped ring 14 of the dielectric ceramics 1 at the upper region and the upper end of the spring 7 touches the lower end of the annular ring 8. The annular ring 8 can move up and down within the interior of the nut cap 3.

The dustproof cap 6 being substantial a cylindrical hollow structure is inserted from the bottom region of the dielectric ceramics 1. The upper section of the dustproof cap 6 is provided with 18 wave-like bendings 61 along the circumference thereof. The lower region of the cap 6 is provided with six similar structure 62. The dustproof cap 6 can be mounted to the nut recess 2, and nut cap 3 and can provides engagement for a hexagonal wrench for tightening.

In combination, the spring 7, the annular ring 8 are respectively mounted onto the upper end of the dielectric ceramics 1 and the mounted by nut cap 3, after that, the nut recess 2 is inserted from the below onto the lower region of the dielectric ceramics 1 such that the outer scre2 thread 21 of the nut recess 2 is screwed tight to the inner screw threads of the nut cap.3. The conductive disc 5 is mounted to the nut cap 3 and the dustproof 6 is inserted from the bottom of the dielectric ceramics 1 such that it encloses the nut recess 2 and the bolt head of the nut cap 3. For the component of the plug structures to be separated, the reverse sequence to combination procedures is employed.

The spark plug structure of the present invention provides further advantages as follow: 1. The components of the spark plug structure can be easily combined or separated which enables of DIY (Do It yourself) to the user. The user can separate the individual components for cleaning purpose or maintenance after a period of use.

2. The spark plug provides a good heat releasing effect. The high temperature of the spark plug after fuel ignition will release through the nut cap 3, nut recess 2 and the dustproof cap 6 and then to the environmental air. Other than the common metal used in the spark plug, excellent heat transfer material such as copper, aluminium can also be used. The wave-like bending provides a greater heat releasing area to enhance excellent heat releasing of the spark plug.

3. The combination of the.electrode 32 of the top face of nut cap 3 with the center electrode 11 of the dielectric ceramics 1 constitutes the ignition of the spark plug structure. The different number of nut cap electrode 32 can be designed for different temperature characteristics at different climatic area. For example, the two preferred embodiments of the nut cap 3 of Fig. 4 are used in cold climatic area. The electrode 32 formed at the top face of the nut cap 3 is a channel 31A or a perpendicular channel 31B, as shown in Fig. 4, to from two semi-circular arch-shaped electrode (32A) or four quarter arch-shape electrode 32B. Such type of electrode provide excellent heat accumulation effect, which facilitates ignition of the spark plug. The three type of the electrode 32C, 32D and 32E can be used in tropical climate region.The two type of the electrode 32F and 32G is most suitably used in the hot climate region. The top face of the electrode is further divided into 1/8 arch shaped electrode or remain 1/8 arch-shaped electrode thereon, for instance electrode 32G. This type of configuration provide a low heat accumulation effect which best suits the hot climate area.

4. The conductive disc 5 provides excellent grounding so as to assure the stability of voltage and thus allow excellent current released from the plug.

5. The dustproof cap 6 not only provide a heat releasing effect but also provide an enclosure for nut recess 2 and nut cap 3 from the contaminationn of debris of the cylinder of engine. Besides, the hexagonal surface at the lower section of the spark plug enables the use of a hexagonal wrench during repairing or maintenance.

Above all, the invention provides a practical, durable and useful spark plug structure which may be economically manufactured, and which includes substantial improvements over prior known art of this type.

While only one embodiment of the present invention has been shown and described herein, it will be appreciated that modifications thereof, some of which have been alluded to hereinabove, may still be readily made thereto by those skilled in the art. I, therefore, intend by the appended claims to cover the modifications alluded to herein as well as all other modifications which fall within the true spirit and scope of my invention.

Claims

WE CLAIMS

1. A spark plug structure comprising: an dielectric ceramics formed from ceramic or dielectric materials encompassed a metallic center rod, one end thereof being protruded as a center electrode, the other end thereof being protruded to form a connector for high voltage electric supply input, the middle section thereof being formed into a center ring having an one stepped layered ring at the upper section thereof; a nut recess, having outer screw threads for screw locking and formed at the outer ring edge, being mounted on the center ring of said dielectric ceramics, the bottom end of said outer threads being formed into a hexagonal bolt head;; a nut cap having a hollow center being mounted at the upper section of said dielectric ceramics, the top end thereof being machined to form an arch-shaped electrode, the middle section of said nut cap being provided with outer threads and the bottom end therefore being formed into hexagonal bolt head having inner threads for the combination with the external threads of said nut recess; a gasket being inserted into the interior of the nut cap bolt head; and a dustproof cap mounted to the bottom of said dielectric ceramics to the top, the upper half and lower half ring edge being respectively punched to form a 18 and 6 wave-like bent structure to allow smooth inserting of nut cap and bolt head of nut recess.

2. A spark plug structure as set forth in Claim 1, further comprises a spring and a ring mounted at the top end of said dielectric ceramics, the lower end of said spring urges said stepped ring edge and the upper end of said spring urges the bottom end of said ring and said ring being moveable within the interior of the nut cap.

3. A spark plug structure as set forth in Claim 1., further comprises a conductive disc mounted to said nut cap, said disc being branched laterally with a side branch disc for ground connection.

4. A spark plug structure as set forth in Claim 1, wherein the top face of said nut cap is machined to form a channel to form a semi-circular arch shaped electrode.

5. A spark plug structure as set forth in Claim 1, wherein the top face of said nut cap is machined to form perpendicular channel which forms 4 quarter arch shaped electrode.

6. A spark plug structure as set forth in Claim 1, wherein the top face of said nut cap is machined to form single semi-circular arch-shaped electrode.

7. A spark plug structure as set forth in Claim 1, wherein the top face of said nut cap is machined to form two quarter circular arch shaped electrode.

8. A spark plug structure as set forth in Claim 1, wherein the top face of said nut cap is machined to form single quarter circular arch shaped electrode.

9. A spark plug structure as set forth in claim 1, wherein the top face of said nut cap is machined to form two opposing one-eighth circular arch shaped electrode.

10. A spark plug structure as set forth in Claim 1, wherein the top face of said nut cap is machined to form a single one-eighth circular arch shaped electrode.