Spark plug and manufacturing method thereof

Abstract

The invention discloses a spark plug and a manufacturing method thereof. The spark plug comprises an insulator, a wiring screw, a central electrode, side electrodes and a shell. The insulator is provided with a stepped hole along the axis direction; at least one part of the central electrode is inserted into the front end side of the stepped hole; the wiring screw is provided with a terminal partand a rod-shaped part, and the rod-shaped part is inserted into the stepped hole of the insulator; the length of the rod-shaped part of the wiring screw extending into the insulator along the axis direction is less than 35mm, and a rod-shaped connecting piece is arranged between the front end of the rod-shaped part and the central electrode; the length of the rod-shaped part of the wiring screw isreduced by increasing the rod-shaped connecting piece, and the connection between the wiring screw and the central electrode is ensured. According to the invention, the rod-shaped part of the screw is limited below 35mm, and the rod-shaped connecting piece extends the length of the rod-shaped part of the wiring screw, so that the length of the rod-shaped part of the wiring screw is effectively shortened; and the process difficulty of the wiring screw in production caused by forced growth of the rod-shaped part due to the fact that the distance between the terminal part and the shell is prolonged can be solved.

Description

technical field

[0001] The present invention relates to a spark plug and a manufacturing method thereof, in particular to a spark plug and a manufacturing method thereof; the spark plug and the manufacturing method thereof can solve the problem that the rod-shaped part is forced due to the extension of the distance between the terminal part and the housing. Due to the growth, the production process of the terminal screw is difficult, and the processing pass rate is low; and the insulator parts are bent during the production process, resulting in the reduction of the strength of the spark plug; it belongs to the technical field of spark plug production. Background technique

[0002] Traditionally, spark plugs are used to ignite the air-fuel mixture in internal combustion engines. For example, a spark plug usually includes: an insulator part, which usually consists of an insulator with a shaft hole extending in the axial direction, a center electrode arranged on the front end ...

Examples

Embodiment 1

[0034] Through the research of the present invention, the researchers found that due to the miniaturization of the engine and the stringent emission regulations, technologies such as turbocharging and direct injection in the cylinder have been applied to the engine, which has caused the required spark plug ignition voltage to increase from below 20kv to 40kv Next, with the increase of the ignition demand voltage, there is a phenomenon that the current leaks from the terminal part of the spark plug screw to the case. Therefore, in recent years, spark plugs with a longer distance from the terminal part of the spark plug connection screw to the case have appeared. This structure will inevitably lead to wiring Since the length of the rod-shaped portion of the screw becomes longer, bending tends to occur.

[0035] Therefore, the present invention proposes a spark plug with a cup-type terminal, including an insulator 2, a terminal screw 1, a center electrode 3, a side electrode 5 and...

Embodiment 2

[0065] The basic principle of embodiment two is the same as that of embodiment one, but the materials and structures adopted are different, as attached Figure 4As shown, it is a cup-type terminal spark plug, including an insulator 202, a terminal screw 201, a center electrode 203, a side electrode 205, and a housing 204; wherein, the insulator 202 has a stepped hole along the axial direction; at least a part of the center electrode 203 Inserted at the front end side of the stepped hole; the terminal screw 210 has a terminal portion 201A and a rod-shaped portion 201B, and the rod-shaped portion 201B is inserted into the stepped hole of the insulator, and the terminal portion 201B leaks out from the rear end of the insulator, and the terminal portion 201B has a cup-shaped feature ; In order to increase the creepage distance, the structure of the extended insulator is adopted, that is, the distance between the terminal part 201B of the terminal part 201 of the terminal screw 201 ...

Embodiment 3

[0072] The basic principle of the third embodiment is the same as that of the first embodiment, except that the materials and structures adopted are different, as shown in the attached Figure 5 Shown is a common terminal spark plug, including an insulator 302, a terminal screw 301, a center electrode 303, a side electrode 305, and a housing 304; wherein, the insulator 302 has a stepped hole along the axis; at least a part of the center electrode 303 is inserted into The front end side of the stepped hole; the terminal screw 301 has a terminal portion 301A and a rod-shaped portion 301B, and the rod-shaped portion 301B is inserted into the stepped hole of the insulator 302, the terminal portion 301A leaks out from the rear end of the insulator 302, and the terminal portion 301A is a common cylindrical terminal , the height of the terminal part 301A is within 5mm; in order to increase the creepage distance, a growth type insulator structure is adopted, that is, the distance betwe...

technical field

[0001] The present invention relates to a spark plug and a manufacturing method thereof, in particular to a spark plug and a manufacturing method thereof; the spark plug and the manufacturing method thereof can solve the problem that the rod-shaped part is forced due to the extension of the distance between the terminal part and the housing. Due to the growth, the production process of the terminal screw is difficult, and the processing pass rate is low; and the insulator parts are bent during the production process, resulting in the reduction of the strength of the spark plug; it belongs to the technical field of spark plug production. Background technique

[0002] Traditionally, spark plugs are used to ignite the air-fuel mixture in internal combustion engines. For example, a spark plug usually includes: an insulator part, which usually consists of an insulator with a shaft hole extending in the axial direction, a center electrode arranged on the front end ...

Examples

Embodiment 1

[0034] Through the research of the present invention, the researchers found that due to the miniaturization of the engine and the stringent emission regulations, technologies such as turbocharging and direct injection in the cylinder have been applied to the engine, which has caused the required spark plug ignition voltage to increase from below 20kv to 40kv Next, with the increase of the ignition demand voltage, there is a phenomenon that the current leaks from the terminal part of the spark plug screw to the case. Therefore, in recent years, spark plugs with a longer distance from the terminal part of the spark plug connection screw to the case have appeared. This structure will inevitably lead to wiring Since the length of the rod-shaped portion of the screw becomes longer, bending tends to occur.

[0035] Therefore, the present invention proposes a spark plug with a cup-type terminal, including an insulator 2, a terminal screw 1, a center electrode 3, a side electrode 5 and...

Embodiment 2

[0065] The basic principle of embodiment two is the same as that of embodiment one, but the materials and structures adopted are different, as attached Figure 4As shown, it is a cup-type terminal spark plug, including an insulator 202, a terminal screw 201, a center electrode 203, a side electrode 205, and a housing 204; wherein, the insulator 202 has a stepped hole along the axial direction; at least a part of the center electrode 203 Inserted at the front end side of the stepped hole; the terminal screw 210 has a terminal portion 201A and a rod-shaped portion 201B, and the rod-shaped portion 201B is inserted into the stepped hole of the insulator, and the terminal portion 201B leaks out from the rear end of the insulator, and the terminal portion 201B has a cup-shaped feature ; In order to increase the creepage distance, the structure of the extended insulator is adopted, that is, the distance between the terminal part 201B of the terminal part 201 of the terminal screw 201 ...

Embodiment 3

[0072] The basic principle of the third embodiment is the same as that of the first embodiment, except that the materials and structures adopted are different, as shown in the attached Figure 5 Shown is a common terminal spark plug, including an insulator 302, a terminal screw 301, a center electrode 303, a side electrode 305, and a housing 304; wherein, the insulator 302 has a stepped hole along the axis; at least a part of the center electrode 303 is inserted into The front end side of the stepped hole; the terminal screw 301 has a terminal portion 301A and a rod-shaped portion 301B, and the rod-shaped portion 301B is inserted into the stepped hole of the insulator 302, the terminal portion 301A leaks out from the rear end of the insulator 302, and the terminal portion 301A is a common cylindrical terminal , the height of the terminal part 301A is within 5mm; in order to increase the creepage distance, a growth type insulator structure is adopted, that is, the distance betwe...

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