CN2502431Y

CN2502431Y - Sparking plug

Info

Publication number: CN2502431Y
Application number: CN 01256364
Authority: CN
Inventors: 唐昌新
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-10-19
Filing date: 2001-10-19
Publication date: 2002-07-24
Anticipated expiration: 2011-10-19

Abstract

The utility model relates to a sparking plug structure of engine, which comprises a central electrode, a hollow post shape insulator for fixing the central electrode and an electric conducting shell sleeved at the outside of the insulator. The empty of the insulator is internally fixed with a connection screw which has one end extending out of the insulator and one end electrically connected with the central electrode through electric conducting sealing glue; the inner wall surface and the outer wall surface of the electric conducting shell are respectively processed with a ring of mutually corresponding flange. The utility model is characterized in that heat conducting sealing glue is filled between the outer column surfaces of the flanges of the insulator and the inner column surface of the electric conducting shell. As the filled heat conducting sealing glue has the functions of sealing and heat conducting, the sealing performance between the electric conducting shell and the insulator is better, and the contact area between the electric conducting shell and the insulator is increased so as to make the heat conducting performance be improved.

Description

Spark plug

Technical field

The utility model relates to the spark plug configuration of engine.

Background technology

Referring to Fig. 1, spark plug comprises the hollow shaft-like insulator 2 of a central electrode 1, fixed center electrode and is enclosed within the outer conductive shell 3 of insulator, also be fixed with the wiring screw rod 5 that one one end stretches out outside the insulator, the other end electrically connects by conductive seal glue 4 and central electrode 1 in the cavity of insulator 2.Seal between conductive shell 3 and the insulator 2 closely in order to make, prior art respectively is processed with a circle corresponding mutually flange 3a and 2a at the internal face of housing 3 and the outside wall surface of insulator 2, and two flanges axially contact together by seal washer 6.For produce with retainer shaft to the power of contacting, Wan Zhe You limit 3b also on a side end face of housing 3.Obviously there is following shortcoming in this spark plug configuration:the influence of the sealing Shou limit 3b strain between I. conductive shell 3 and the insulator 2 is bigger, the strain that produces in the time of also must carrying out Yi Re limit with elimination Leng limit behind the therefore general Zai Leng limit, perhaps add towards powder 15 during Zai Leng limit and guarantee its sealing, so just make manufacturing process complicated, and the presentation quality of housing is affected during Re limit; II. because the heat transfer area between flange 3a and the 2a is little, and the capacity of heat transmission is poor, therefore influenced the heat conductivility between central electrode 1 and the housing 3, thereby the calorific value that has also just limited spark plug improves.

Summary of the invention

The purpose of this utility model provides a kind of sealing and heat conductivility spark plug preferably.

The utility model is achieved in that spark plug comprises the hollow shaft-like insulator of a central electrode, fixed center electrode and is enclosed within the outer conductive shell of insulator, cavity internal fixation at insulator has the wiring screw rod that one one end stretches out outside the insulator, the other end electrically connects by conductive seal glue and central electrode, respectively be processed with the corresponding mutually flange of a circle at the internal face of conductive shell and the outside wall surface of insulator, especially, between the inner cylinder face of the external cylindrical surface of insulator flange and conductive shell, be filled with the heat conduction fluid sealant.Because the heat conduction fluid sealant of being filled is with sealing and conductive force, therefore the strain on the sealing Bu Shou limit between conductive shell and the insulator influences, make sealing more reliable, and the increase of the contact area between conductive shell and the insulator, thereby heat conductivility is improved.

The utility model has the advantages that sealing is reliable, heat conduction is good, improved the calorific value of spark plug.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, wherein:

Fig. 1 is the structural representation of existing spark plug;

Fig. 2 is the structural representation of the utility model spark plug.

Embodiment

Referring to Fig. 2, spark plug comprises the hollow shaft-like insulator 8 of a central electrode 7, fixed center electrode and is enclosed within the outer conductive shell 9 of insulator, cavity internal fixation at insulator 8 has a wiring screw rod 10, and wiring screw rod 10 electrically connects by conductive seal glue 12 and central electrode 7.Outside wall surface at the internal face of conductive shell 9 and insulator 8 respectively is processed with a circle corresponding mutually flange 9a and 8a, is filled with heat conduction fluid sealant 11 between the inner cylinder face of the external cylindrical surface of insulator flange 8a and conductive shell 9.Heat conduction fluid sealant 11 has improved the sealing between housing 9 and the insulator 8, makes it not influenced by the strain of Ke Ti limit 9b, and the contact area between conductive shell 9 and the insulator 8 is increased, and has improved heat conductivility.

As further improvement, present embodiment is provided with spring 13 and conducting compression bars 14 between wiring screw rod 10 and conductive seal glue 12, spring 13 acts between wiring screw rod 10 and the conducting compression bars 14, conducting compression bars 14 is pressed on the conductive seal glue 12, the endoporus fit clearance of the diameter of conducting compression bars 14 and insulator 8 is less, even make conductive seal glue 12 also difficult gap of getting between conducting compression bars 14 and the insulator 8 under molten state.This design feature has been improved the heat conductivility between central electrode 7 and the insulator 8, and can guarantee the presentation quality of wiring screw rod 10.Its principle is as follows: in the manufacture process of existing spark plug shown in Figure 1, must be pressed into an end of wiring screw rod 5 in the conductive seal glue 4 down hot, make the gap between partially conductive fluid sealant fusing inflow wiring screw rod 5 and the insulator 2, the reverse flow of conductive seal glue 4 will cause the defective tightness that combines of partially conductive fluid sealant and insulator, influenced heat conductivility, and owing to wiring screw rod 5 press-fits under hot, so its presentation quality must be affected; And in the process of making spark plug shown in Figure 2, available conducting compression bars 14 extruding conductive seal glue 12 under hot, because the diameter of conducting compression bars 14 and the endoporus fit clearance of insulator 8 are less, conductive seal glue 12 is difficult to get into the gap between conducting compression bars 14 and the insulator 8, therefore the extruding force of 14 pairs of conductive seal glue 12 of conducting compression bars is bigger, so just improved the bonding tightness that press-fits whole conductive seal glue 12 in back and insulator 8, thereby heat conductivility is improved, on the other hand, because can be after press-fiting conducting compression bars 14, just under cold conditions, wiring screw rod 10 is tightened on insulator 8 with adhesive glue, and by spring 13 realizations and depression bar 14, electrically connecting of conductive seal glue 12 and central electrode 7, therefore embodiment shown in Figure 2 has not only guaranteed the reliability that connects, and has also guaranteed the presentation quality of wiring screw rod.

Claims

1. spark plug, comprise the hollow shaft-like insulator of a central electrode, fixed center electrode and be enclosed within the outer conductive shell of insulator, cavity internal fixation at insulator has the wiring screw rod that one one end stretches out outside the insulator, the other end electrically connects by conductive seal glue and central electrode, outside wall surface at the internal face of conductive shell and insulator respectively is processed with the corresponding mutually flange of a circle, it is characterized in that: be filled with the heat conduction fluid sealant between the inner cylinder face of the external cylindrical surface of insulator flange and conductive shell.

2. spark plug as claimed in claim 1 is characterized in that: be provided with spring and conducting compression bars between wiring screw rod and conductive seal glue, spring action is between wiring screw rod and conducting compression bars, and the endoporus fit clearance of the diameter of conducting compression bars and insulator is less.