Spark plug and processing method thereof

Abstract

The invention relates to the field of spark plug manufacturing, in particular to a spark plug and a machining method thereof. The spark plug comprises a ceramic insulating cylinder, a wiring rod is arranged on the inner side of the ceramic insulating cylinder, a baffle ring and a wiring bayonet are arranged on the upper portion of the wiring rod, and the baffle ring is attached to the upper side of the ceramic insulating cylinder. The method comprises the following steps: S1, adding a binder into ceramic powder, and putting the mixture into a mold to prepare a ceramic insulating cylinder; s2, a junction pole is inserted into the ceramic insulating cylinder; s3, the ceramic insulating cylinder is put into a sintering furnace to be sintered, so that the junction pole is combined with the ceramic insulating cylinder; s4, after the central electrode stem is inserted into the ceramic insulating cylinder, the central electrode stem is connected to the junction pole through threads; and S5, sleeving the outer side of the ceramic insulating cylinder with the outer shell and the sleeve, and mounting a side electrode II on the lower side of the sleeve. And displacement between the wiring rod and the ceramic insulating cylinder is prevented through the baffle ring.

Description

Technical Field

[0001] This invention relates to the field of spark plug manufacturing, and more specifically to a spark plug and its processing method. Background Technology

[0002] A spark plug is a component used in internal combustion engines. Its function is to generate a spark inside the gasoline engine to ignite the air-fuel mixture, allowing the engine to run normally. A spark plug typically consists of a metal shell, a center electrode, a ground electrode, and an insulator. When a high-voltage current passes through the center electrode, it jumps across the electrode gap, generating a spark that ignites the air-fuel mixture, thereby pushing the piston and propelling the vehicle forward. The quality and type of spark plug have a significant impact on engine performance and fuel economy. If the connection between the spark plug's lead wire and the ceramic insulator is unstable, displacement can occur, leading to spark plug damage. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a spark plug and its processing method, the beneficial effect of which is to prevent displacement between the terminal rod and the ceramic insulating cylinder by means of a retaining ring.

[0004] A spark plug includes a ceramic insulating cylinder, an inner side of which is provided with a connecting rod, and a retaining ring and a connecting slot are provided on the upper part of the connecting rod, with the retaining ring fitting against the upper side of the ceramic insulating cylinder.

[0005] The lower part of the ceramic insulating cylinder is provided with a tapered part, the lower end of the connecting rod is provided with an internal thread groove, the central electrode rod is located inside the tapered part, the lower end of the central electrode rod protrudes from the tapered part, and a threaded head is provided on the central electrode rod, which is threadedly connected to the internal thread groove.

[0006] The upper part of the central electrode rod is provided with a limiting ring, which presses against the lower side of the connecting rod. The lower end of the central electrode rod is provided with a hexagonal rotating head.

[0007] The upper outer side of the ceramic insulating cylinder is provided with multiple annular grooves from top to bottom.

[0008] A method for manufacturing a spark plug, the method comprising the following steps:

[0009] S1: Add binder to ceramic powder and place it in a mold to make a ceramic insulating cylinder;

[0010] S2: Insert the connector into the ceramic insulating cylinder;

[0011] S3: Place the ceramic insulating cylinder into the sintering furnace for sintering, so that the connecting rod is combined with the ceramic insulating cylinder;

[0012] S4: After inserting the center electrode rod into the ceramic insulating cylinder, connect the center electrode rod to the terminal rod through the thread;

[0013] S5: Place the outer shell and sleeve over the outside of the ceramic insulating cylinder, and install the second side electrode on the lower side of the sleeve. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0015] Figure 1 A flowchart of a spark plug manufacturing method;

[0016] Figure 2 A schematic diagram of the structure of a spark plug Figure 1 ;

[0017] Figure 3 A schematic diagram of the structure of a spark plug Figure 2 ;

[0018] Figure 4 A schematic diagram of the structure of a spark plug Figure 3 ;

[0019] Figure 5 A schematic diagram of the structure of a spark plug Figure 4 ;

[0020] Figure 6 Schematic diagram of the structure of a ceramic insulating cylinder Figure 1 ;

[0021] Figure 7 Schematic diagram of the structure of a ceramic insulating cylinder Figure 2 ;

[0022] Figure 8 Schematic diagram of the connector rod Figure 1 ;

[0023] Figure 9 Schematic diagram of the connector rod Figure 2 ;

[0024] Figure 10 This is a schematic diagram of the central electrode rod.

[0025] Figure 11 Schematic diagram of the outer shell structure Figure 1 ;

[0026] Figure 12 Schematic diagram of the outer shell structure Figure 2 .

[0027] In the figure: ceramic insulating cylinder 101; outer conical surface 102; washer ring 103; convex ring 104; conical part 105; annular groove 106;

[0028] 201; 202; 203; 204; 205;

[0029] Center electrode rod 301; limiting ring 302; threaded head 303; horizontal column 304; hexagonal screw head 305;

[0030] Outer shell 401; outer ring 402; inner conical surface 403; sleeve 404; side electrode one 405; side electrode two 406; positioning pin 407; socket 408; skirt thread 409; bent card 410; sealing ring 411. Detailed Implementation

[0031] like Figure 6-9 As shown, this example can achieve the effect of preventing displacement between the connecting rod 201 and the ceramic insulating cylinder 101.

[0032] Since the spark plug includes a ceramic insulating cylinder 101, a connecting rod 201 is provided on the inner side of the ceramic insulating cylinder 101. A retaining ring 202 and a wiring slot 203 are provided on the upper part of the connecting rod 201. The retaining ring 202 fits against the upper side of the ceramic insulating cylinder 101, and the wiring slot 203 is used for wiring. The retaining ring 202 presses against the upper side of the ceramic insulating cylinder 101, thereby preventing displacement between the connecting rod 201 and the ceramic insulating cylinder 101.

[0033] like Figure 6-10 As shown, this example enables the replacement of the center electrode rod 301 when it is damaged.

[0034] The ceramic insulating cylinder 101 has a tapered portion 105 at its lower part, and the lower end of the connecting rod 201 has an internal threaded groove 204. The center electrode rod 301 is located inside the tapered portion 105, with its lower end protruding from the tapered portion 105. A threaded head 303 is provided on the center electrode rod 301, and the threaded head 303 is threaded onto the internal threaded groove 204. The center electrode rod 301 can be detached from the connecting rod 201 via the threaded head 303. When the center electrode rod 301 is connected to the connecting rod 201, the circuit between them is conductive. The center electrode rod 301 can be replaced if damaged.

[0035] like Figure 10 As shown, this example can achieve the effect of a tight connection between the center electrode rod 301 and the terminal rod 201.

[0036] Because a limiting ring 302 is provided on the upper part of the central electrode rod 301, and the limiting ring 302 presses against the lower side of the connecting rod 201, and a hexagonal screw head 305 is provided at the lower end of the central electrode rod 301. The hexagonal screw head 305 facilitates the rotation of the central electrode rod 301, thereby facilitating the disassembly of the central electrode rod 301. After the limiting ring 302 presses against the lower side of the connecting rod 201, the central electrode rod 301 and the connecting rod 201 are securely connected.

[0037] like Figure 6-8 As shown in Figure 10, this example allows for the placement of more side electrodes at the lower end of the central electrode rod 301.

[0038] Because the upper outer side of the ceramic insulating cylinder 101 is provided with multiple annular grooves 106 from top to bottom, and the lower end of the central electrode rod 301 is provided with a horizontal column 304, the horizontal column 304 can widen the end of the central electrode rod 301, so that more side electrodes can be provided at the lower end of the central electrode rod 301.

[0039] like Figure 6-12 As shown, this example can achieve the effect of placing the outer casing 401 on the outside of the ceramic insulating cylinder 101.

[0040] Because a convex ring 104 is provided in the middle of the ceramic insulating cylinder 101, and an outer conical surface 102 is provided on both the upper and lower sides of the convex ring 104, the outer shell 401 is fitted on the outside of the convex ring 104, and a sleeve 404 is provided on the lower side of the outer shell 401. The sleeve 404 is fitted on the outside of the conical part 105. The outer shell 401 can be easily connected to the convex ring 104, and the sleeve 404 can be easily connected to the outside of the conical part 105, thereby setting the outer shell 401 on the outside of the ceramic insulating cylinder 101.

[0041] like Figure 6-12 As shown, this example achieves the effect of fixing the sleeve 404 to the outside of the tapered portion 105.

[0042] Since the upper inner side of the sleeve 404 is provided with an inner conical surface 403, and two outer conical surfaces 102 are each bonded with a washer ring 103, the inner conical surface 403 presses on the lower outer conical surface 102. The upper side of the outer shell 401 is fixed with multiple curved clips 410 in a ring shape. The multiple curved clips 410 press on the upper washer ring 103. When the inner conical surface 403 on the sleeve 404 contacts the lower outer conical surface 102 of the convex ring 104, the sleeve 404 and the convex ring 104 are engaged. Then, the multiple curved clips 410 are pressed onto the upper outer conical surface 102, thereby fixing the outer shell 401 onto the convex ring 104, and thus fixing the sleeve 404 onto the outer side of the conical part 105. The upper washer 103 is placed between the multiple curved cards 410 and the upper outer conical surface 102, and the lower washer 103 is placed between the sleeve 404 and the lower outer conical surface 102. Thus, the two washer rings 103 provide shock absorption and buffer between the ceramic insulating cylinder 101 and the outer shell 401.

[0043] like Figure 11-12 As shown, this example can achieve the effect of sealing the connection between the engine and the spark plug.

[0044] Because the upper outer part of the sleeve 404 is provided with an outer ring 402, and a sealing ring 411 is bonded to the lower side of the outer ring 402, and the outer periphery of the sleeve 404 is provided with a skirt thread 409. The skirt thread 409 on the sleeve 404 facilitates the connection of the spark plug to the engine, and a sealing ring 411 can be provided through the outer ring 402 to seal the connection between the engine and the spark plug.

[0045] like Figure 10-12 As shown, this example can achieve the effect of producing three electric sparks on the spark plug.

[0046] Because a socket 408 is welded onto the sleeve 404, the upper end of the second side electrode 406 is inserted into the socket 408, and the positioning pin 407 passes through the second side electrode 406 and the socket 408. The lower end of the second side electrode 406 is located below the center electrode rod 301. The left and right ends of the lower side of the sleeve 404 are each welded with a first side electrode 405, which is located on both sides of the crossbar 304. An electric spark can be generated between the second side electrode 406 and the center electrode rod 301. After removing the positioning pin 407 from the socket 408, the second side electrode 406 can be removed and replaced. An electric spark can be generated between the two first side electrodes 405 and the ends of the crossbar 304, thus generating three electric sparks on the spark plug for easy ignition.

[0047] A method for manufacturing a spark plug, the method comprising the following steps:

[0048] S1: Add binder to ceramic powder and place it in a mold to make ceramic insulating cylinder 101;

[0049] S2: Insert the connecting rod 201 into the ceramic insulating cylinder 101;

[0050] S3: Place the ceramic insulating cylinder 101 into the sintering furnace for sintering, so that the connecting rod 201 is combined with the ceramic insulating cylinder 101;

[0051] S4: After inserting the center electrode rod 301 into the ceramic insulating cylinder 101, connect the center electrode rod 301 to the connecting rod 201 by thread;

[0052] S5: Place the outer shell 401 and the sleeve 404 on the outside of the ceramic insulating cylinder 101, and install the second side electrode 406 on the lower side of the sleeve 404.

Claims

1. A spark plug comprising a ceramic insulating sleeve (101), characterized in that: The ceramic insulating cylinder (101) has a connecting rod (201) on its inner side. The upper part of the connecting rod (201) is provided with a retaining ring (202) and a connecting bayonet (203). The retaining ring (202) is in contact with the upper side of the ceramic insulating cylinder (101).

2. A spark plug according to claim 1, characterized in that: The ceramic insulating cylinder (101) has a tapered part (105) at its lower part, and the lower end of the connecting rod (201) has an internal thread groove (204). The central electrode rod (301) is located inside the tapered part (105), and the lower end of the central electrode rod (301) protrudes from the tapered part (105). The central electrode rod (301) has a threaded head (303) which is threaded onto the internal thread groove (204).

3. A spark plug according to claim 2, characterized in that: The upper part of the central electrode rod (301) is provided with a limiting ring (302), which presses against the lower side of the connecting rod (201). The lower end of the central electrode rod (301) is provided with a hexagonal screw head (305).

4. A spark plug according to claim 3, characterized in that: The upper outer side of the ceramic insulating cylinder (101) is provided with multiple annular grooves (106) from top to bottom.

5. A spark plug according to claim 4, characterized in that: A horizontal column (304) is provided at the lower end of the central electrode rod (301).

6. A spark plug according to claim 5, characterized in that: The ceramic insulating cylinder (101) has a convex ring (104) in the middle, and an outer conical surface (102) is provided on both the upper and lower sides of the convex ring (104). The outer shell (401) is fitted on the outside of the convex ring (104), and a sleeve (404) is provided on the lower side of the outer shell (401). The sleeve (404) is fitted on the outside of the conical part (105).

7. A spark plug according to claim 6, characterized in that: The upper inner side of the sleeve (404) is provided with an inner conical surface (403), and two outer conical surfaces (102) are each bonded with a washer (103). The inner conical surface (403) presses on the outer conical surface (102) located on the lower side. Multiple curved cards (410) are fixed in a ring on the upper side of the outer shell (401), and the multiple curved cards (410) press on the washer (103) located on the upper side.

8. A spark plug according to claim 7, characterized in that: The upper outer side of the sleeve (404) is provided with an outer ring (402), and a sealing ring (411) is bonded to the lower side of the outer ring (402). The outer periphery of the sleeve (404) is provided with a skirt thread (409).

9. A spark plug according to claim 8, characterized in that: A socket (408) is fixed on the sleeve (404). The upper end of the second side electrode (406) is inserted into the socket (408). The positioning pin (407) passes through the second side electrode (406) and the socket (408). The lower end of the second side electrode (406) is located below the central electrode rod (301). The left and right ends of the lower side of the sleeve (404) are both fixed with the first side electrode (405). The two first side electrodes (405) are located on both sides of the horizontal column (304).

10. A method for processing a spark plug according to claim 9, characterized in that, The method includes the following steps: S1: Add binder to ceramic powder and place it in a mold to make a ceramic insulating cylinder (101); S2: Insert the connecting rod (201) into the ceramic insulating cylinder (101); S3: Place the ceramic insulating cylinder (101) into the sintering furnace for sintering, so that the connecting rod (201) is combined with the ceramic insulating cylinder (101); S4: After inserting the center electrode rod (301) into the ceramic insulating cylinder (101), connect the center electrode rod (301) to the connecting rod (201) by thread; S5: Place the outer shell (401) and sleeve (404) on the outside of the ceramic insulating cylinder (101), and install the second side electrode (406) on the lower side of the sleeve (404).

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