CN202749682U

CN202749682U - Spark plug

Info

Publication number: CN202749682U
Application number: CN 201220287382
Authority: CN
Inventors: 柳孟柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-15
Filing date: 2012-06-15
Publication date: 2013-02-20
Anticipated expiration: 2022-06-15

Abstract

The utility model relates to a part of an internal combustion engine and particularly relates to a spark plug. The spark plug comprises a shell (1) and an insulation porcelain core (2) fixedly mounted inside the shell (1), wherein the insulation porcelain core (2) is internally provided with a central electrode (3); the upper end of the central electrode (3) extends out of the insulation porcelain core (2) to form a discharge terminal (71); the shell (1) is provided with a flaming cavity (11) which is internally provided with a grounding electrode (12); the discharge terminal (71) is located inside the flaming cavity (11); a V-shaped slot (72) is arranged at the top end of the discharge terminal (71); and two slot edges of the V-shaped slot (72) are close to the grounding electrode (12). A discharge ignition device formed by the central electrode and the grounding electrode is placed inside the flaming cavity, the V-shaped slot is arranged at the top of the discharge terminal, and the slot edges are changed into two sharp discharge terminals, thereby allowing the discharge frequency to be higher and obviously improving the ignition efficiency.

Description

Spark plug

Technical field

The utility model relates to a kind of gas engine part, relates in particular to spark plug.

Background technology

Spark ignition engine is by the air-fuel mixture in the spark ignitor combustion chamber.The performance of spark plug directly has influence on the performance of engine, if spark plug is the efficient indoor air-fuel mixture of ignition combustion correctly, at least the fuel that has part in the combustion chamber can not burn, this will cause the loss of engine power, the increase of the reduction of oil inflame efficient and hydrocarbon discharge capacity.

The environment of spark plug work is exceedingly odious, needs igniting under the high-temperature and high-pressure conditions many times in the combustion chamber, and the deterioration of spark plug is unavoidable, deposit occurs on the present sparking-plug electrode of multilist, and causes the corrosion of electrode.

In order to slow down the spark plug speed of worsening, the technical staff has carried out various improvement to spark plug.Part is improved the etching problem that overcomes electrode by the quantity of the toughness that improves the electrode manufactured materials or increase electrode.The another kind of improvement is surface discharge spark plug, and the metal shell of this spark plug is the grounding electrode of an annular, positive electrode of layout that its center is coaxial.Each includes the meter of reseting to the conventional ignition plug complexity these technology, and this can bring the obvious raising of manufacturing cost.

The utility model content

The utility model provides the spark plug of the high and long service life of a kind of ignition effectiveness.In order to realize the foregoing invention purpose, the utility model has adopted following technological means:

Spark plug comprises shell and is fixedly installed in the interior insulated ceramic core of shell; In the described insulated ceramic core central electrode is housed; The upper end of described central electrode is stretched out insulated ceramic core and is formed a discharge end; Described shell has a flame chamber; Described flame is provided with grounding electrode in the chamber; Described discharge end is in the flame chamber; Described discharge end tips is offered a V-type groove; Two grooves edges of described V-type groove are near grounding electrode.

Inside, described flame chamber is circular cylindrical cavity, and opening draws in gradually from the inside to the outside and is frusto-conical; The terminal center that is positioned at the flame chamber of described discharge;

Described grounding electrode is circular; The terminal ring heart below that is positioned at grounding electrode of described discharge;

On the inwall that is fixed on the flame chamber that described grounding electrode is coaxial;

Described shell is metal shell, and is one-body molded with grounding electrode;

Described circular grounding electrode to the gradually attenuation of interior edge, is blade-like from the outer;

The upper surface of described grounding electrode is the bowl-shape of indent;

The lower surface of described grounding electrode is frusto-conical;

Described grounding electrode is positioned at the middle part in flame chamber, and the flame chamber is separated into flame epicoele and two chambers of flame cavity of resorption, and described insulated ceramic core extends in the flame cavity of resorption.

The beneficial effects of the utility model are: the discharge ignition apparatus of central electrode and grounding electrode formation is arranged in the flame chamber, the V-type groove is offered at the terminal top of discharging, groove makes discharge frequency higher along becoming two sharp-pointed discharge end parts, has significantly improved ignition effectiveness; Grounding electrode is circular, and central electrode is positioned at the ring heart of grounding electrode, so that discharge spark is larger, the air mixture igniting is more abundant; The flame chamber is grounded electrode separation and becomes up and down two chambers, has increased the ignition space of air mixture, has further improved ignition effectiveness.

Description of drawings

Fig. 1 is the structural representation of the utility model spark plug;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the B-B cutaway view of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, the preferred implementation of the utility model spark plug is made detailed description:

Shown in Fig. 1 is the structural representation of the utility model spark plug.The same with conventional spark plug, this spark plug is installed on the cylinder cover of internal combustion engine and uses.This spark plug mainly comprises shell 1 and insulated ceramic core 2.Shell 1 is steel, and as shown in Figure 2, the upper end of shell 1 is cylindric, and cylindrical outer wall is provided with screw thread 14, and in order to the spark plug sealing is installed on the cylinder cover, as shown in Figure 3, there is a hexagon afterbody 15 lower end of shell 1, in order to adapt to reversing of pipe wrench.

Shell 1 inside is the cavity of up/down perforation, and the first half of cavity is flame chamber 11, and the latter half seals embedded installing insulating porcelain core 2.Flame chamber 11 is and concentric cylindric of shell 1 substantially, the waist inwall in flame chamber 11 is to projecting inward, form a circular ledge, the grounding electrode 12 of spark plug namely, grounding electrode 12 from the annulus outer to annulus in along gradually attenuation, be blade-like, the upper surface of annulus is the bowl-shape of indent, the lower surface of annulus is frusto-conical, thereby flame chamber 11 is separated into flame epicoele 111 and 112 two chambers of flame cavity of resorption that are interconnected, flame epicoele 111 is with a bowl-shape bottom, and flame cavity of resorption 112 is with the top of a frusto-conical.

The upper end in flame chamber 11 has an opening that inwardly closes up gradually 16, and opening 16 specifically is frusto-conical, and its entrance circular diameter is D1, and the body diameter in flame chamber 11 is D2.Opening 16 is limited out by the blade-like antelabium of an annular, and this lip portion is blocked towards the passage in flame chamber 11, so that the inlet area S1 of opening 16 only has the 25%[D1:D2=1:2 of the cylindrical cross-section area S2 in flame chamber 11].

The upper end of insulated ceramic core 2 is tapered from top to bottom, tapered, inner fixed installation central electrode 7, central electrode 7 is made by the nickel alloy that contains copper and chromium, be drawn into cylinder form, the upper end of central electrode 7 extends out from the taper upper end of insulated ceramic core 2, forms a discharge terminal 71.Terminal 71 tops of discharging are positioned at 1mm place, grounding electrode 12 below, the top of discharge terminal 71 has a V-type groove 72, two grooves edges of V-type groove 72 are upwards near grounding electrode 12, thereby so that the top of discharge terminal 71 becomes two sharp-pointed discharge end parts, make discharging efficiency higher, obviously improved the ignition effectiveness of spark plug.

Circular grounding electrode 12 is separated into flame chamber 11 flame epicoele 111 and 112 two chambers of flame cavity of resorption that are interconnected, insert in the flame cavity of resorption 112 the taper upper end of insulated ceramic core 2, as shown in Figure 2, the ring heart below that is positioned at grounding electrode 12 that discharge terminal 71 is concentric, discharge terminal 71 and grounding electrode 12 are spaced from each other, and form a circular discharging gap 13 between the two.Such structure makes discharge spark larger, and air mixture is lighted more abundant.

Insulated ceramic core 2 is made by the pottery with high thermal conductivity, and its latter half is stretched out outside the shell 1, is beneficial to heat radiation.Insulated ceramic core 2 inside are fixedly installed central electrode 7, resistance material 3 and metal screw 4 from top to bottom successively, and the three is electric connection successively.The lower end of metal screw 4 extends out from the lower end of insulated ceramic core 2, and Passscheiben 5 fixedly mounts the terminal 6 of a metal material again, in order to be connected in a usual manner the ignition system of automobile.

The fuel-air mixed gas body is compressed into flame chamber 11 in use, lights and burns by the electric spark of discharge between grounding electrode 12 and the discharge terminal 71.Flame chamber 11 is grounded electrode 12 and is separated into up and down two chambers, has increased the ignition space of air mixture, has further improved ignition effectiveness.

Claims

1. spark plug comprises shell (1) and is fixedly installed in the interior insulated ceramic core (2) of shell (1); Central electrode (3) is housed in the described insulated ceramic core (2); The upper end of described central electrode (3) is stretched out insulated ceramic core (2) and is formed a discharge terminal (71); It is characterized in that: described shell (1) has a flame chamber (11); Be provided with grounding electrode (12) in the described flame chamber (11); Described discharge terminal (71) is in the flame chamber (11); A V-type groove (72) is offered on terminal (71) top of described discharge; Two grooves edges of described V-type groove (72) are near grounding electrode (12).

2. spark plug according to claim 1 is characterized in that: described flame chamber (11) is inner to be circular cylindrical cavity, and opening (16) draws in gradually from the inside to the outside and is frusto-conical; Described discharge terminal (71) is positioned at the center of flame chamber (11).

3. spark plug according to claim 2 is characterized in that: described grounding electrode (12) is for circular; Described discharge terminal (71) is positioned at the ring heart below of grounding electrode (12).

4. spark plug according to claim 3 is characterized in that: on the coaxial inwall that is fixed on flame chamber (11) of described grounding electrode (12).

5. spark plug according to claim 4, it is characterized in that: described shell (1) is metal shell, and is one-body molded with grounding electrode (12).

6. spark plug according to claim 5, it is characterized in that: described circular grounding electrode (12) to the gradually attenuation of interior edge, is blade-like from the outer.

7. spark plug according to claim 6, it is characterized in that: the upper surface of described grounding electrode (12) is the bowl-shape of indent.

8. spark plug according to claim 7, it is characterized in that: the lower surface of described grounding electrode (12) is frusto-conical.

9. spark plug according to claim 8, it is characterized in that: described grounding electrode (12) is positioned at the middle part of flame chamber (11), flame chamber (11) are separated into flame epicoele (111) and (112) two chambers of flame cavity of resorption, and described insulated ceramic core (2) extends in the flame cavity of resorption (112).