Spark plug
By using threaded connection and spot welding to fix the spark plug body to the pre-ignition seat, the problem of heat dissipation difficulties caused by the welded structure is solved, thereby improving the high temperature resistance and service life of the spark plug.
Patent Information
- Application Number
- CN202511310344.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2025-12-09
AI Technical Summary
The existing welded structure of spark plugs with pre-combustion chambers makes it difficult to dissipate heat effectively, affecting the high-temperature resistance and service life of the spark plugs.
The spark plug body is fixed to the pre-ignition seat by threaded connection and spot welding, which enhances the fixation reliability and increases the contact area to improve heat dissipation efficiency.
It improves the heat dissipation efficiency of the pre-ignition seat, enhances the high-temperature resistance and service life of the spark plug, and makes the fixation more secure.
Smart Images
Figure CN121097508A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a spark plug. BACKGROUND
[0002] The spark plug is an important component of the ignition system of a gasoline engine, which can introduce high-voltage electricity into the combustion chamber and make it jump through the electrode gap to generate a spark, thereby igniting the combustible mixture in the cylinder. The electrode of a common spark plug is exposed to the outside of the spark plug. In the case of lean-burn, the mixture is difficult to be reliably, quickly and completely burned, which may cause misfire, knock or incomplete combustion. There is a spark plug with a pre-chamber on the market, which has a pre-chamber cavity with a spray hole added to the end of the traditional spark plug. The spark generated by the spark plug first ignites the rich mixture in the pre-chamber, and the high-temperature and high-pressure flame formed by the combustion is then sprayed into the main combustion chamber in the form of a turbulent jet through the spray hole, achieving multi-point ignition and significantly improving the stability and combustion speed of lean-burn.
[0003] At present, the pre-chamber cavity of such a spark plug with a pre-chamber is directly welded on the shell of the spark plug. Although this integrated welded structure is firm, it also has obvious disadvantages: the pre-chamber withstands extremely high temperature during operation, and the welded structure hinders the efficient conduction of heat, making it difficult for the heat of the pre-chamber and the center electrode of the spark plug to be dissipated in time through the metal shell to the cylinder head, resulting in excessive thermal load and seriously affecting the high-temperature resistance and service life of the spark plug. SUMMARY
[0004] In view of the defects of the existing spark plug, the technical problem to be solved by the present application is to provide a spark plug that can effectively improve the heat dissipation efficiency of the pre-chamber and improve the high-temperature resistance and service life of the spark plug.
[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, the present application is realized by the following technical measures: a spark plug body and a pre-chamber are provided, the bottom of the spark plug body is provided with a sparking positive electrode, the inner wall of the bottom is provided with a coupling part I, the middle of the pre-chamber is provided with a flange, the bottom is provided with an air inlet, the two sides of the flange are respectively provided with a coupling part II and a flame spraying part, the flange is provided with a sparking hole, the sparking hole is provided with a sparking negative electrode, the spark plug body and the pre-chamber are fixed by thread connection through the coupling part I and the coupling part II, the flame spraying part is provided with a plurality of flame spraying holes, and the coupling part II is provided with an exhaust hole axially penetrating the coupling part II and the flange.
[0006] Further, the spark plug body and the pre-chamber are fixed by spot welding after thread connection.
[0007] Compared with the prior art, the advantage of the spark plug lies in that the heat dissipation efficiency of the precombustion seat is effectively improved, the high-temperature resistance and service life of the spark plug are improved, and the threaded connection and spot welding fixation of the spark plug body and the precombustion seat make the fixation of the two more reliable. BRIEF DESCRIPTION OF DRAWINGS
[0008] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for explanation by way of the non-limiting embodiments of the present application. In the drawings: Figure 1 A structure schematic view of the spark plug.
[0009] Reference signs: 1, spark plug body; 2, precombustion seat; 3, striking positive electrode; 4, coupling part I; 5, air inlet; 6, flange; 7, jetting part; 8, coupling part II; 9, striking hole; 10, striking negative electrode; 11, jetting hole; 12, exhaust hole. DETAILED DESCRIPTION
[0010] Hereinafter, the present application will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.
[0011] In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, “bottom”, “top” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0012] Please refer to Figure 1The embodiment provides a spark plug, which comprises a spark plug body 1, a precombustion seat 2, a striking positive pole 3 arranged at the bottom of the spark plug body 1, a coupling part I 4 arranged at the inner wall of the bottom of the spark plug body 1, wherein the coupling part I 4 is internally threaded, an air inlet 5 arranged at the bottom of the precombustion seat 2, a flange 6 arranged at the middle of the precombustion seat 2, a spraying part 7 arranged at one side of the flange 6, a striking hole 9 arranged on the flange 6, a striking negative pole 10 arranged in the striking hole 9, wherein the striking negative pole 10 is opposite to the striking positive pole 3, a plurality of spraying holes 11 arranged on the spraying part 7, a coupling part II 8 arranged at the other side of the flange 6, an exhaust hole 12 arranged on the coupling part II 8 and penetrating through the coupling part II 8 and the flange 6 in the axial direction, wherein the coupling part II 8 is externally threaded, and the spark plug body 1 and the precombustion seat 2 are threadedly connected through the coupling part I 4 and the coupling part II 8 and then are spot-welded and fixed at the contact position of the outer walls of the two, so that the contact area between the spark plug body 1 and the precombustion seat 2 is increased, the heat in the precombustion seat 2 is rapidly transmitted to the outside of the spark plug, and the heat dissipation efficiency is improved.
[0013] In use, the combustible mixture in the combustion chamber enters the precombustion seat 2 through the air inlet 5, the striking positive pole and the striking negative pole of the spark plug generate an electric spark through high-voltage electricity, ignite the combustible mixture in the precombustion seat 2, and spray the combustible mixture into the combustion chamber through the spraying holes 11, and the excess exhaust gas enters the combustion chamber again through the exhaust hole 12, and the exhaust gas can accelerate the heat dissipation speed between the precombustion seat 2 and the spark plug body 1 when passing through the exhaust hole 12.
[0014] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A spark plug, characterized in that: A spark plug includes a spark plug body (1) and a pre-ignition seat (2). The spark plug body (1) has a positive ignition electrode (3) at the bottom and a coupling part I (4) on the inner wall of the bottom. The pre-ignition seat (2) has a flange (6) in the middle and an air inlet (5) at the bottom. The two sides of the flange (6) are a coupling part II (8) and a flame-spraying part (7). The flange (6) has a ignition hole (9) and a negative ignition electrode (10) in the ignition hole (9). The spark plug body (1) and the pre-ignition seat (2) are fixed by threaded connection through the coupling part I (4) and the coupling part II (8). The flame-spraying part (7) has a plurality of flame-spraying holes (11). The coupling part II (8) has an exhaust hole (12) that axially penetrates the coupling part II (8) and the flange (6).
2. The spark plug according to claim 1, characterized in that: The spark plug body (1) and the pre-ignition seat (2) are connected by threads and then spot-welded at the contact point of their outer walls.