CN111641113A - Method for preventing terminal part of spark plug wiring screw from being oxidized and spark plug - Google Patents
Method for preventing terminal part of spark plug wiring screw from being oxidized and spark plug Download PDFInfo
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- CN111641113A CN111641113A CN202010312036.9A CN202010312036A CN111641113A CN 111641113 A CN111641113 A CN 111641113A CN 202010312036 A CN202010312036 A CN 202010312036A CN 111641113 A CN111641113 A CN 111641113A
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- 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
- H01T13/04—Means providing electrical connection to sparking plugs
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- 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
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
Abstract
A method for preventing terminal part of connection screw of spark plug from being oxidized and spark plug, the insulation part of spark plug includes connection screw, and the terminal part of connection screw and rod-shaped part are an integral structure; the wiring screw rod of the spark plug is made of a material which is difficult to oxidize at high temperature, and the terminal part of the wiring screw rod of the spark plug is prevented from being oxidized by utilizing the oxidation resistance of the material of the wiring screw rod; the spark plug includes an insulator member, and a shell member partially bonded to an outer periphery of the insulator member; the insulator part consists of a central electrode, a sealing body and a wiring screw rod; the terminal part of the connection screw rod and the rod-shaped part are made of materials which are difficult to oxidize at high temperature. The cup-type wiring screw rod with the wiring screw rod integrated structure is made of the material which is difficult to oxidize at high temperature, and the problem of unreliable ignition caused by oxidation of the terminal part of the wiring screw rod can be really solved.
Description
Technical Field
The invention relates to a method for improving the performance of a spark plug and the spark plug thereof, in particular to a method for preventing the terminal part of a wiring screw of the spark plug from being oxidized and the spark plug thereof; belongs to the technical field of spark plug production.
Background
Conventionally, a spark plug is used to ignite a mixture in an internal combustion engine. The spark plug generally includes: the insulation body, central electrode, casing, weld side electrode and the wiring screw rod of casing front end face, form the clearance between side electrode and the central electrode.
The wiring screw rod is a key component in the spark plug and is provided with a terminal part protruding out of the rear end face of the insulator and a rod-shaped part inserted into a shaft hole of the insulator, and the terminal part is electrically connected with the ignition coil; the known connecting screw is made of low carbon steel which is not corrosion resistant, the spark plug has a high temperature operation process in the production process, and the insulator part of the spark plug needs to be kept at high temperature for more than 10 minutes, so that the terminal part of the connecting screw is easy to contact with oxygen in the air to form loose oxide skin, the loose oxide skin is easy to fall off and blocks the electric connection of the terminal part and an ignition coil, and abnormal ignition of an engine can be caused. It is common to dispose a nickel material on the terminal portion of the terminal screw to prevent the terminal portion from being oxidized, but a small amount of non-uniform thickness occurs in the inner layer during electroplating of the nickel material, thereby reducing the protection effect of the nickel material and causing the above phenomenon.
In recent years, engines tend to be miniaturized, and in order to obtain higher power and meet more stringent emission regulations, the engines generally adopt technologies such as turbocharging and in-cylinder direct injection, so that the pressure in the combustion chamber of the engine is increased rapidly. It is known that when the combustion chamber pressure rises, an increase in ignition breakdown voltage is directly caused, with the result that current leakage occurs in the terminal portion of the terminal screw to the housing, causing engine misfire, and a structure has been recently disclosed in which the distance between the terminal screw and the housing is increased, with the result that the terminal portion of the terminal screw is shortened, the length of the rear end portion of the insulator for insulation is increased, and the terminal portion of the terminal screw is provided in a concave shape. Compared with the terminal part shape specified in the traditional GB/T6791, the concave terminal part shape can cause the phenomenon of uneven distribution of nickel layer due to uneven electric field distribution, so that the terminal part of the structure is easier to be oxidized in a high-temperature process, and the engine has higher probability of very work due to nickel layer oxidation.
In addition, in the production process of the insulator component, the insulator component needs to be put into high temperature for sintering, the wiring screw rod is oxidized in the sintering process, and the wiring screw rod is usually subjected to nickel plating treatment to improve the oxidation resistance of the wiring screw rod. In the cup-shaped terminal portion known in recent years, the cup bottom is likely to be unevenly adhered to the terminal portion of the terminal screw due to uneven electric field distribution when nickel electroplating is performed, so that the cup bottom is likely to be oxidized to different degrees during sintering, and further, the contact resistance is increased. The cup bottom of the cup-shaped terminal part is often used for connecting with a power plug to provide voltage for breaking down a gap of the spark plug, and if the contact resistance value is too large, the energy release of the power supply is easily blocked, so that the discharge of the spark plug is influenced, and the operation of the internal combustion engine is further damaged. Meanwhile, the nickel plating process brings about a large amount of pollutant emission and is not beneficial to green development, so that improvement on the method is needed.
Through search, no relevant patent technical literature reports are found, and the most similar patent literatures comprise the following:
1. patent No. CN201410191258.4 entitled "spark plug" discloses a spark plug provided with a recess at the rear end portion of a terminal electrode and a nickel layer formed at the rear end portion of the terminal electrode, in which the corrosion resistance of the terminal electrode is sufficiently improved and the peeling of the nickel layer is more reliably suppressed. The spark plug includes: an insulating porcelain having a shaft hole penetrating in an axial direction; and a terminal electrode inserted into the shaft hole with its rear end portion exposed from the rear end of the insulating porcelain. A recess is provided in the rear end of the terminal electrode, the recess having an axial direction as a depth direction. A nickel layer is provided on an outer surface of the rear end portion of the terminal electrode. The nickel layer has a thickness of 3 to 25 [ mu ] m, and the average cross-sectional area of crystal grains constituting the nickel layer is 50 to 500 [ mu ] m 2 in a cross section orthogonal to the outer surface of the nickel layer.
2. Patent No. CN201080040132.7, entitled "spark plug", discloses a spark plug comprising: an insulator having a shaft hole extending in an axial direction; and a terminal electrode having a rod-shaped leg portion inserted through a rear end side of the axial hole and a head portion exposed from a rear end of the insulator, wherein a front end portion of the leg portion is fixed to the insulator, and a length of the leg portion along the axis is 35mm or more, and the center of gravity of the terminal electrode is located inside the insulator.
3. Patent No. cn201280038177.x, entitled "spark plug", which discloses a spark plug comprising: an insulator having a shaft hole extending in an axial direction; a main body case disposed on an outer periphery of the insulator; and a terminal electrode having a leg portion inserted through a rear end side of the axial hole and a head portion formed on a rear end side of the leg portion and having an outer diameter larger than an outer diameter of the leg portion, wherein a rear end side trunk portion exposed from a rear end of the body shell is provided on the insulator, and a maximum outer diameter of the rear end side trunk portion is 9.5mm or less, the insulator including: an end surface receiving portion which is located closer to the front end side in the axial direction than the rear end of the insulator and which is in contact with the front end side end surface of the head portion; and an outer peripheral portion through which at least a distal end portion of the head portion is inserted, the outer peripheral portion being positioned on an outer periphery of the head portion.
From the description of the above patent, it can be seen that no one has proposed how to solve the problem of the terminal portion of the terminal screw being easily oxidized; patent CN201410191258.4 proposes to improve the corrosion resistance of the terminal electrode by nickel plating, but the high temperature oxidation performance is obviously reduced; it is therefore necessary to investigate this problem.
Disclosure of Invention
The present invention is directed to the above problems of the prior art spark plug, and provides a method for preventing the terminal of the connecting screw of the spark plug from being oxidized, and a spark plug; the method for preventing the terminal part of the connecting screw of the spark plug from being oxidized and the spark plug can effectively solve the problem that the terminal part of the cup-shaped spark plug is easy to be oxidized at present; and simultaneously, the problem of overlarge contact resistance of the cup bottom of the cup type terminal part during electroplating can be solved, and the environment-friendly development is realized.
In order to achieve the purpose, the invention provides a method for preventing the terminal part of a connection screw rod of a spark plug from being oxidized, wherein the spark plug adopts a cup-shaped connection screw rod, and the terminal part of the connection screw rod and a rod-shaped part are of an integral structure; the method is characterized in that: the wiring screw rod of the spark plug is made of a material which is difficult to oxidize at high temperature, and the terminal part of the wiring screw rod of the spark plug is prevented from being oxidized by utilizing the oxidation resistance of the material of the wiring screw rod.
Furthermore, the wire connecting screw is made of alloy steel material with Fe and Cr as main components, and the oxidation resistance of the wire connecting screw is improved through Cr alloy, so that the oxidation of the terminal of the spark plug wire connecting screw is prevented.
Further, the content of Cr in the alloy steel material is more than 11 wt%.
Furthermore, the alloy steel material also comprises at least three materials of C, Ni, Mn, Mo, Si, N, Al, Ti, Se, Nb and Cu; the alloy steel material with Cr as main component and other alloy added is formed.
Further, the other alloy contains at least Ni, and the content of Ni is 1.5wt% or more.
Furthermore, the other alloy contains Cu, and the content of Cu is less than or equal to 4 wt%.
Furthermore, the terminal part of the connecting screw is concave and extends towards the rod-shaped part, the volume of the terminal part is V, and the volume of the terminal part is V which is less than or equal to 200mm3。
A spark plug having an insulator member composed of a center electrode, a sealing body, and a terminal screw, and a case member partially bonded to an outer periphery of the insulator member, the case member being composed of a case and side electrodes forming a gap for discharge; the terminal part of the connecting screw rod and the rod-shaped part are of an integrated structure; the wiring screw rod is made of a material which is difficult to oxidize at high temperature.
Furthermore, the material which is difficult to be oxidized at high temperature is alloy steel material which takes Fe and Cr as main components, and the oxidation resistance of the wiring screw is improved through Cr alloy, so that the terminal part of the wiring screw of the spark plug is prevented from being oxidized.
Furthermore, the alloy steel material also comprises at least three materials of C, Ni, Mn, Mo, Si, N, Al, Ti, Se, Nb and Cu; the wire connecting screw rod is made of Cr as main body and other alloy steel material.
Furthermore, the content of Cr in the wiring screw is more than 11wt%, and the content of Ni is more than 1.5 wt%.
The invention has the advantages that:
according to the invention, the wiring screw rod is made of a material which is difficult to oxidize at high temperature, so that nickel plating treatment of a terminal part can be avoided, and the wiring screw rod cannot be oxidized at high temperature; therefore, when the nickel electroplating is carried out, the cup bottom is easily attached to the terminal part of the wiring screw rod due to the uneven distribution of an electric field, so that the cup bottom is easily oxidized to different degrees during sintering, and the contact resistance value is not changed. Meanwhile, as nickel plating is omitted, the nickel plating process is omitted, which can bring about a large amount of pollutant emission, and is beneficial to the development of green production.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a schematic diagram of the process of discharging a spark plug having a terminal portion of a terminal screw with a certain degree of oxidation;
FIG. 3 is a graph of the oxidation resistance of various materials at 850 deg.C;
FIG. 4 is a graph of oxidation resistance of various materials at 1050 deg.C;
FIG. 5 is a schematic view of a terminal portion of a nickel-plated cup-type connection screw;
FIG. 6 is a schematic view of a terminal portion of a nickel-plated conventional wire connection screw;
FIG. 7 is a schematic view of a terminal portion of the connecting screw according to the present invention;
FIG. 8 is a schematic view of the terminal portion of the connecting screw of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples.
Example one
Fig. 1 is a schematic view of a spark plug, and fig. 1 shows a spark plug of the present invention, which comprises an insulator member 2, and a shell member 3 partially bonded to the outer periphery of the insulator member 2, wherein the insulator member 2 is composed of a center electrode 4, a sealing body 5, and a terminal screw 1, the shell member 2 is composed of a shell 6 and a side electrode 7, and a gap for discharging is formed between the center electrode 4 and the side electrode 7; the wiring screw rod 1 consists of a terminal part 1A leaking out of the rear end of the insulator and a rod-shaped part 1B inserted into a shaft hole of the insulator, and the terminal part 1A of the wiring screw rod 1 is of a cup-shaped structure; a concave blind hole 8 extending towards the rod-shaped part is arranged at the center of the terminal part 1A, the volume of the terminal part is V, and the volume of the terminal part is V less than or equal to 200mm3(ii) a The terminal portion 1A and the rod-like portion 1B of the terminal screw 1 are integrally formed of a material that is less likely to be oxidized at high temperature.
The material which is difficult to oxidize at high temperature is the wiring screw 1 which is made of the material which is difficult to oxidize at high temperature and is formed by taking Fe and Cr as main components and adding other alloy components, and the oxidation resistance of the wiring screw is improved through the Cr alloy, so that the terminal part of the wiring screw of the spark plug is prevented from being oxidized.
The Cr alloy at least comprises Ni, Mn, Mo, Si, N, Se and Cu; the wiring screw rod which takes Cr as a main body and is added with other alloy materials which are difficult to oxidize at high temperature is formed.
The wire connecting screw rod 1 contains more than 11wt% of Cr, more than 1.5wt% of Ni and 0-5 wt% of Mn, Mo, Si, N and Se.
The reason why the wiring screw is made of the material which is difficult to be oxidized at high temperature is that the inventor finds in practice that the service life of the spark plug is directly related to the ignition performance between the central electrode and the side electrode and also has a great relationship with the quality and the damage of the wiring screw 1, so that the wiring screw 1 is neglected by giving much attention to the two electrodes in the past, and the wiring screw is generally made of the common carbon steel material. Through a series of experimental observations, the inventor finds that the resistance performance of the terminal part of the connecting screw made of the common carbon steel also directly influences the overall performance and the service life of the spark plug. According to observation, the terminal part of the wiring screw of the existing spark plug is generally protected from being oxidized in the sintering process, and the wiring screw is usually subjected to nickel plating treatment to improve the oxidation resistance of the wiring screw; however, the flatness of the nickel-plated layer is difficult to control in the nickel plating process, and particularly, the bottom of a concave pit of a wiring screw of a cup-shaped terminal is easy to have an uneven phenomenon, so that poor contact is easy to occur when the wiring screw of the spark plug is connected with an ignition wire, certain gaps are generated in some places, the existence of the gaps can cause surface materials to be oxidized when the gaps are broken down, and if the material oxidation phenomenon is serious, interruption at the arc maintaining stage is easy to cause engine fire, so that the ignition performance of the spark plug is greatly influenced. In the past, the situation starts from how to improve the nickel plating process to make the nickel plating layer more flat, but the ideal requirement is always difficult to achieve. Through long-term research, the inventor finds that the wiring screw is made of Fe and Cr alloy materials with high-temperature oxidation resistance by changing the materials of the wiring screw, is easier, more reliable and simpler than the method adopting an improved nickel plating process, and has better oxidation resistance effect after tests. The added alloy comprises Ni, Mn, Mo, Si, N, Se and Cu, and the components have the following functions:
1. chromium (Cr) mainly acts to improve strength and oxidation resistance;
2. ni is a conventional component and has the function of remarkably improving plasticity, C is a conventional component in steel, the content is very small and is less than 0.2wt%, and other components basically have the functions of improving brittleness and improving strength;
3. cu can further improve the cold processing performance of the steel, but the content of Cu cannot be too high, and is controlled to be less than or equal to 4wt%, and if the content of Cu is too high, the strength of the steel is easily reduced;
4. si and Mn are deoxidizers and are mainly used for improving the strength;
5. the N and the C have similar functions and can improve the toughness of the steel, but the N does not form chromium carbide and can improve the corrosion resistance;
6. the functions of Mo, AL, Nb, Ti and Se are all to improve the strength, and the functions of various components have slight differences, so that excessive analysis is not performed.
The strength as referred to herein should be understood to include oxidation resistance. By effectively controlling the contents of Ni, Mn, Mo, Si, N, Se and Cu within the range of 5wt%, the strength of the wiring screw can be effectively ensured, and the oxidation resistance can be improved. Under the condition of ensuring the strength required by the spark plug, the oxidation resistance of the terminal part of the wiring screw is effectively improved.
Fig. 2 shows the process of spark plug discharge with a certain oxidation degree at the terminal of the connecting screw, stage a is the charging time of the ignition coil, stage B is the spark plug breakdown moment, and stage C is the spark discharge stage. Generally, A is between 2ms and 10ms, the amplitude of B in the Y direction represents the magnitude of breakdown voltage, the amplitude YB of a traditional engine B is often between 5kv and 20kv, but with the new technology of the engine, YB exceeds 30kv, thereby bringing various challenges to the traditional spark plug, which will be detailed in the following description, the amplitude YC in the Y direction in the C stage is often between 300v and 800v, the D stage is abnormal discharge phenomenon, the electric connection part of the terminal screw and the ignition coil becomes unreliable due to the oxidation of the terminal part of the terminal screw, because the contact resistance of the oxidized terminal part is increased and is not enough to maintain the release of Yc, further the energy of the ignition coil cannot be released, and the spark plug cannot break down the mixed gas. For the above reasons, the terminal portion of the wire connecting screw has been conventionally solved by nickel plating, but the oxidation peeling phenomenon of different proportions still exists at the terminal portion in a high temperature process of manufacturing the spark plug due to problems of processes, impurities and the like at the time of plating, and such a phenomenon can be visually detected even and is regarded as an unqualified product. The present invention provides a terminal screw made of a material having excellent oxidation resistance even at high temperatures, and which does not cause oxidation of a terminal portion of the terminal screw during manufacture and use of a spark plug, thereby not causing the above-mentioned problems.
The above conditions are fully verified through experiments; spark plug discharge tests were carried out using a conventional terminal screw (as shown in FIG. 8), a conventional cup terminal screw (as shown in FIG. 5) and a terminal screw according to the present invention (as shown in FIG. 6), respectively, and the waveform of each ignition was recorded using an oscilloscope, and the number of times of abnormal ignition in the D shape shown in FIG. 2 was recorded, as represented by n, and the results are shown in the following table:
TABLE 1
Through analysis, the wiring screw adopting the cup-shaped terminal part structure is easy to have abnormal ignition, even is more than one time higher than the common terminal part, and the abnormal ignition is completely eliminated by using the wiring screw provided by the invention instead.
The inventor also finds that the corrosion resistance of the material can be improved by increasing the content of Gr and Ni which are difficult to be oxidized at high temperature, and the corrosion resistance can be further improved by continuously increasing the content of Gr and Ni; the oxidation of the female terminal of the connecting screw by high temperature sintering is shown in fig. 3 and 4 for different amounts of Gr and Ni and for the conventional nickel plating process.
As shown in attached figures 3 and 4, taking two materials which are difficult to be oxidized at high temperature as an example, the Gr content which is difficult to be oxidized at high temperature is 16wt% -18wt%, the Ni content is 3.5wt% -5.5wt%, the Gr content which is difficult to be oxidized at high temperature is 17wt% -19wt%, and the Ni content is 8wt% -10 wt%. Wherein the second material that is hard to be oxidized at high temperature has a higher Cr content and a higher Ni content than the first material that is hard to be oxidized at high temperature. The two materials are made into a concave type wiring screw rod by a cold heading mode, wherein the wiring screw rod made of a second material which is difficult to oxidize at a high temperature is called A, the wiring screw rod made of a first material which is difficult to oxidize at a high temperature is called B, and a traditional concave type wiring screw rod is called C. Under the same environment, A, B, C three kinds of wire screws were respectively placed at 850 ℃ and 1050 ℃ for 30 minutes, 60 minutes, 90 minutes and 120 minutes, and then cooled at normal temperature, and their weights were measured using a precision weight scale, to obtain graphs as shown in fig. 3 and 4. It can be seen that the mass increase of a is minimal and the material has better oxidation resistance. The spark plug was manufactured to withstand high temperatures for periods of time typically not exceeding 30 minutes, so the test only analyzed the ability to oxidize at different temperatures at relatively close times.
The wiring screw rod is formed in a cold heading mode, and the inventor also finds that the wiring screw rod is made of a material which is difficult to oxidize at high temperature, and the wiring screw rod is processed in the cold heading mode, so that cracking is easily caused during processing, and the addition of cu with the weight being less than 4wt% into the material improves the extensibility of the material and is more beneficial to processing and forming; tests prove that the copper contained in the wiring screw can effectively improve the manufacturability of the wiring screw, so that the wiring screw is not cracked in cold forming, especially the concave bottom part.
FIG. 7 shows a method for processing a wire connecting screw, wherein the first step is material cutting, the second step is the size of a cold heading and thread rolling position, the third step is the size of a cold heading cup, and the fourth step is thread rolling. In the second and third steps, the material is likely to crack, so that an appropriate amount of copper must be added to the material.
Example two
The basic principle of the second embodiment is the same as that of the first embodiment, except that the adopted material and structure are different, and the spark plug is a spark plug which is provided with an insulator part and a shell part partially combined on the periphery of the insulator part, wherein the insulator part is composed of a central electrode, a sealing body and a wiring screw rod, the shell part is composed of a shell and side electrodes, and the central electrode and the side electrodes form a gap for discharging; the terminal part of the wiring screw rod is of a common terminal structure; the terminal part and the rod-shaped part of the wiring screw are made of materials which are difficult to oxidize at high temperature and have an integrated structure.
The wiring screw is made of alloy steel materials with Fe and Cr as main components, and the oxidation resistance of the wiring screw is improved through the Cr alloy, so that the terminal part of the wiring screw of the spark plug is prevented from being oxidized.
The alloy steel material also comprises any three of C, Ni, Mo, Si, Al, Se, Nb and Cu; the wire connecting screw rod is made of Cr as main body and other alloy steel material.
The wire connecting screw has Cr content over 11wt%, Ni content over 1.5wt% and other components in 0-1.5 wt%.
The others are the same as the embodiments.
EXAMPLE III
The basic principle of the third embodiment is the same as that of the first embodiment, except that the adopted materials and structures are different, the spark plug is provided with an insulator component and a shell component which is partially combined on the periphery of the insulator component, wherein the insulator component is composed of a central electrode, a sealing body and a wiring screw rod, the shell component is composed of a shell and side electrodes, and the central electrode and the side electrodes form a gap for discharging; the terminal part of the wiring screw rod is of a cup-shaped structure; the method is characterized in that: the terminal part and the rod-shaped part of the wiring screw are made of materials which are difficult to oxidize at high temperature and have an integrated structure.
The wiring screw is made of alloy steel materials with Fe and Cr as main components, and the oxidation resistance of the wiring screw is improved through the Cr alloy, so that the terminal part of the wiring screw of the spark plug is prevented from being oxidized.
The alloy steel material also comprises at least three materials of C, Ni, Mn, Mo, Si, N, Al, Ti, Se, Nb and Cu; the wire connecting screw rod is made of Cr as main body and other alloy steel material.
The content of Cr in the wiring screw is more than 11wt%, the content of Ni is more than 1.5wt%, and the content of other components is 0wt% -1.5 wt%.
The above listed embodiments are only for clear and complete description of the technical solution of the present invention with reference to the accompanying drawings; it should be understood that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments, and the terms such as "upper", "lower", "front", "back", "middle", etc. used in this specification are for clarity of description only, and are not intended to limit the scope of the invention, which can be implemented, and the changes or modifications of the relative relationship thereof are also regarded as the scope of the invention without substantial technical changes. Meanwhile, the structures, the proportions, the sizes, and the like shown in the drawings are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes in proportion relation, or adjustments of the sizes, can still fall within the range covered by the technical contents disclosed in the present invention without affecting the effects and the achievable purposes of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It can be seen from the above embodiments that the present invention also relates to a method for preventing the terminal portion of the connection screw of the spark plug from being oxidized, wherein the connection screw of the spark plug adopts a cup-shaped connection screw, and the terminal portion of the connection screw and the rod-shaped portion are integrated; the method is characterized in that: the wiring screw rod of the spark plug is made of a material which is difficult to oxidize at a high temperature, and the terminal part of the wiring screw rod of the spark plug is prevented from being oxidized by utilizing the oxidation resistance of the material of the wiring screw rod.
Furthermore, the wire connecting screw is made of alloy steel material with Fe and Cr as main components, and the oxidation resistance of the wire connecting screw is improved through Cr alloy, so that the oxidation of the terminal of the spark plug wire connecting screw is prevented.
Further, the content of Cr in the alloy steel material is more than 11 wt%.
Furthermore, the alloy steel material also comprises at least three materials of C, Ni, Mn, Mo, Si, N, Al, Ti, Se, Nb and Cu; the alloy steel material with Cr as main component and other alloy added is formed.
Furthermore, the Ni content in the other alloy is more than 1.5wt%, and the content of other materials is 0-1.5 wt%.
Furthermore, the other alloy contains Cu, and the content of Cu is less than or equal to 4 wt%.
Furthermore, the terminal part of the connecting screw is concave and extends towards the rod-shaped part, the volume of the terminal part is V, and the volume of the terminal part is V which is less than or equal to 200mm3。
The invention has the advantages that:
according to the invention, the wiring screw rod is made of a material which is difficult to oxidize at high temperature, so that nickel plating treatment of a terminal part can be avoided, and the wiring screw rod cannot be oxidized at high temperature; therefore, when the nickel electroplating is carried out, the cup bottom is easily attached to the terminal part of the wiring screw rod due to the uneven distribution of an electric field, so that the cup bottom is easily oxidized to different degrees during sintering, and the contact resistance value is not changed. Meanwhile, as nickel plating is omitted, the nickel plating process is omitted, which can bring about a large amount of pollutant emission, and is beneficial to the development of green production. This has some advantages as follows:
1. the problem of unreliable ignition caused by the oxidation of the terminal part of the wiring screw can be really solved;
2. the material which is difficult to be oxidized at high temperature is adopted for manufacturing, so that the nickel plating or other electroplating processes of the wiring screw can be omitted, and the problem of sewage treatment caused by electroplating can be avoided; the environmental protection performance of production operation is improved;
because the nickel plating treatment of the wiring screw is not adopted, the problem that the surface of the terminal part of the wiring screw is not smooth due to the nickel plating is avoided, the uneven distribution of an electric field on the cup bottom is eliminated, the uneven thickness of the nickel-plated material is easily adhered to the terminal part of the wiring screw, the cup bottom is easily oxidized to different degrees during sintering, and the contact resistance value is not changed.
Claims (11)
1. A method for preventing terminal part of spark plug connection screw rod from oxidation includes connecting screw rod in insulation part of spark plug, and terminal part of connecting screw rod and rod-shaped part are integrated structure; the method is characterized in that: the wiring screw rod of the spark plug is made of a material which is difficult to oxidize at high temperature, and the terminal part of the wiring screw rod of the spark plug is prevented from being oxidized by utilizing the oxidation resistance of the material of the wiring screw rod.
2. The method of preventing terminal oxidation of a spark plug terminal screw as claimed in claim 1, wherein: the terminal part of the spark plug wiring screw is prevented from being oxidized by utilizing the oxidation resistance of the material of the wiring screw, the wiring screw is made of alloy steel material taking Fe and Cr as main components, and the oxidation resistance of the wiring screw is improved by adopting the oxidation resistance alloy material, so that the terminal part of the spark plug wiring screw is prevented from being oxidized.
3. The method of preventing terminal oxidation of a spark plug terminal screw as claimed in claim 2, wherein: the Cr content in the alloy steel material is more than 11 wt%.
4. The method of preventing terminal oxidation of a spark plug terminal screw as claimed in claim 2, wherein: the alloy steel material also comprises at least 3 materials of C, Ni, Mn, Mo, Si, N, Al, Ti, Se, Nb and Cu; the alloy steel material which takes Fe and Cr as main bodies and is added with other alloys is formed.
5. The method of preventing terminal oxidation of a spark plug terminal screw as set forth in claim 4, wherein: the other alloy contains at least Ni, and the content of Ni is more than 1.5 wt%.
6. The method of preventing terminal oxidation of a spark plug terminal screw as set forth in claim 4, wherein: the other alloy contains Cu, and the content of Cu is less than or equal to 4 wt%.
7. The method of preventing terminal oxidation of a spark plug terminal screw as claimed in claim 1, wherein: the terminal part of the connecting screw extends towards the rod-shaped part in a concave shape, the volume of the terminal part is V, and the volume of the terminal part is V which is less than or equal to 200mm3。
8. A spark plug having an insulator member composed of a center electrode, a sealing body, and a terminal screw, and a case member partially bonded to an outer periphery of the insulator member, the case member being composed of a case and side electrodes forming a gap for discharge; the terminal part of the connecting screw rod and the rod-shaped part are of an integrated structure; the method is characterized in that: the wiring screw rod is made of a material which is difficult to oxidize at high temperature.
9. The spark plug of claim 8, wherein: the material which is difficult to oxidize at high temperature is an alloy steel material which takes Fe and Cr as main components, and the oxidation resistance of the wiring screw is improved through the Cr alloy, so that the terminal part of the wiring screw of the spark plug is prevented from being oxidized.
10. The spark plug of claim 9 wherein: the alloy steel material also comprises at least three materials of C, Ni, Mn, Mo, Si, N, Al, Ti, Se, Nb and Cu; the wire connecting screw rod is made of Cr as main body and other alloy steel material.
11. The method of preventing terminal oxidation in a spark plug terminal screw as set forth in claim 10, wherein: the content of Cr in the wiring screw is more than 11wt%, and the content of Ni is more than 1.5 wt%.
Priority Applications (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0945458A (en) * | 1995-08-02 | 1997-02-14 | Ngk Spark Plug Co Ltd | Spark plug having resistance |
| CN101982906A (en) * | 2010-09-09 | 2011-03-02 | 沈玮 | Electricity excitation and energy collection spark plug |
| CN103166127A (en) * | 2011-12-19 | 2013-06-19 | 苏州科赫节能火花塞有限公司 | Corrosion-resisting and high-temperature-resisting spark plug |
| CN103746295A (en) * | 2013-12-27 | 2014-04-23 | 黄忠波 | Electrode material for sparking plug |
-
2020
- 2020-04-20 CN CN202010312036.9A patent/CN111641113B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0945458A (en) * | 1995-08-02 | 1997-02-14 | Ngk Spark Plug Co Ltd | Spark plug having resistance |
| CN101982906A (en) * | 2010-09-09 | 2011-03-02 | 沈玮 | Electricity excitation and energy collection spark plug |
| CN103166127A (en) * | 2011-12-19 | 2013-06-19 | 苏州科赫节能火花塞有限公司 | Corrosion-resisting and high-temperature-resisting spark plug |
| CN103746295A (en) * | 2013-12-27 | 2014-04-23 | 黄忠波 | Electrode material for sparking plug |
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