DE10015916A1 - Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction - Google Patents

Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction

Info

Publication number
DE10015916A1
DE10015916A1 DE2000115916 DE10015916A DE10015916A1 DE 10015916 A1 DE10015916 A1 DE 10015916A1 DE 2000115916 DE2000115916 DE 2000115916 DE 10015916 A DE10015916 A DE 10015916A DE 10015916 A1 DE10015916 A1 DE 10015916A1
Authority
DE
Germany
Prior art keywords
spark plug
insulator foot
housing
space
shaded zone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE2000115916
Other languages
German (de)
Inventor
Manfred Vogel
Werner Herden
Walter Benedikt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE2000115916 priority Critical patent/DE10015916A1/en
Publication of DE10015916A1 publication Critical patent/DE10015916A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00Sparking plugs
    • H01T13/46Sparking plugs having two or more spark gaps
    • H01T13/467Sparking plugs having two or more spark gaps in parallel connection
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00Sparking plugs
    • H01T13/20Sparking plugs characterised by features of the electrodes or insulation
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00Sparking plugs
    • H01T13/20Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/38Selection of materials for insulation

Abstract

A spark plug with a housing (60) is proposed; an insulator foot (20) attached to a housing (60), an upper space (40) being provided between the insulator foot (20) and the housing (60); a central electrode (10) which is guided through the insulator foot (20) and which is exposed at the tip of the insulator foot; a ground electrode (50) attached to the housing (60), which lies opposite the center electrode (10). In the area of the intermediate space (40), the insulator foot (20) has a contour (30; 30 '; 35) which is provided at least at one point and which has a shaded area (A; A'; A '') with respect to the axial direction. having.

Description

STATE OF THE ART

The present invention relates to a spark plug with a Housing, an insulator foot attached to the housing, wherein in the upper area there is a space between the insulator base and the housing is provided, one through the insulator foot guided center electrode, which at the insulator tip exposed; and a ground electrode attached to the housing de, which is opposite the center electrode.

Although applicable to any spark plug, the above underlying invention and the underlying problema tic in relation to an on board a motor vehicle Liche spark plug for its OTTO engine explained.

In general, it is necessary that one in the combustion chamber air / Fuel mixture with the relevant spark plug at each Ignite combustion cycle safely to avoid misfires avoid, for example, harmful to the kata can affect analyzer.

The problem underlying the present invention generally consists in the formation of shunts  between the center electrode and the housing or want to prevent the ground electrode.

ADVANTAGES OF THE INVENTION

The spark plug according to the invention with the features of the Proverb 1 points to the known approaches Advantage on that they form the formation of soot shunts largely suppressed. This affects in particular that Cold start behavior of the engines using the spark plug extremely positive.

The idea underlying the present invention be is that the insulator foot in the area of the intermediate space a contour provided at least at one point which is internal with respect to the axial direction re the spark plug has a shadowed area. This shading affects the court in the gap flow component from the ignition Soot and prevents the formation of a continuous soot layer that would cause a shunt.

Advantageous further developments can be found in the subclaims Developments and improvements to those specified in claim 1 Spark plug.

According to a preferred development, the contour has the Shape of a fillet. This is a particularly simple rea lisable and effective form.  

According to a further preferred development, the Kon tour in the form of an elevation. This can then be advantageous be if the gap is large enough.

According to a further preferred development, the shaded area rotationally symmetrical around the insulator walk around. This shape is easy to manufacture and very efficient.

According to a further preferred development, there are several shaded areas provided. For example, establish a real network of shadows.

DRAWINGS

Embodiments of the invention are in the drawings shown and in the description below he purifies.

Show it:

Fig. 1 is a schematic representation of a spark plug as the first embodiment of the present invention in cross section;

Fig. 2 is a schematic representation of a spark plug as a second embodiment of the present invention in cross section; and

Fig. 3 is a schematic representation of a spark plug as a third embodiment of the present invention in cross section.

DESCRIPTION OF THE EMBODIMENTS

In the figures are only those for the present invention essential parts of the spark plugs according to the embodiment shown, whereas the remaining parts for the sake of Clarity are omitted or not described become.

Fig. 1 shows a schematic representation of a spark plug as a first embodiment of the present invention in cross section.

The spark plug according to this embodiment has a housing 60 and an insulator base 20 attached to the housing 60 . In the upper region, a space 40 is provided between the Isola gate base 20 and the housing 60 . Through the Isola gate foot 20 is a center electrode 10 , which is exposed at the insulator tip. Attached to the housing 60 is a ground electrode 50 , which lies opposite the center electrode 10 .

During the combustion, soot flows with a flow component S into the space 40 and is deposited on the walls of the space 40 , which in the case of a continuous layer of soot between the central electrode 10 and the housing 60 or the ground electrode 50 leads to said unwanted bypasses.

To counter this, the insulator foot 20 has a contour 30 in the area of the space 40 at one point in the form of a rotationally symmetrical groove, which surface with respect to the axial flow component S directed into the space from the soot produced during ignition has a shaded area A has, in which no soot can be deposited. This means that there is no continuous soot layer between the center electrode 10 and the housing 60 or ground electrode 50 , which would lead to the said unwanted shunts.

This applies in any case if the soot flow in the loading area of the contour 30 extends essentially in the axial direction. In practice, this requirement can regularly be met if the fillet is far enough from the Isola tip of the foot.

Fig. 2 shows a schematic representation of a spark plug as a second embodiment of the present invention in cross section.

In contrast to the first embodiment above, the second embodiment the fillet is not a symmetri trough shape, but an upward sloping Shape which has an even better shaded area A ' forms.  

Fig. 3 shows a schematic representation of a spark plug as a third embodiment of the present invention in cross section.

In Fig. 3, A "denotes a shaded area where an elevation 35 is provided instead of a fillet as in the first and second embodiments.

Although the present invention has been described above Zugter embodiments has been described, it is not limited to modifi but in many ways graceable.

In particular, the contour to form the shadowing not limited to the examples shown, son can be designed as desired.

It can also be any combination of hollow throats and surveys, depending on requirements Facing special flow conditions for the soot be seen.

Claims (5)

1. Spark plug with:
a housing ( 60 );
a mounted on the housing (60), insulator (20), is provided (20) and the housing (60) in the upper region, an intermediate space (40) between the Isola torfuß;
a center electrode ( 10 ) which is guided through the insulator foot ( 20 ) and is exposed at the tip of the insulator foot;
a ground electrode ( 50 ) attached to the housing ( 60 ), which lies opposite the center electrode ( 10 );
characterized in that
the insulator foot ( 20 ) in the area of the intermediate space ( 40 ) has a contour ( 30 ; 30 '; 35 ) which is provided at least at one point and which has a shaded area (A; A'; A ") in relation to the axial direction .
2. Spark plug according to claim 1, characterized in that the contour ( 30 ; 30 '; 35 ) has the shape of a groove ( 30 ; 30 ').
3. Spark plug according to claim 1, characterized in that the contour ( 30 ; 30 '; 35 ) has the shape of an elevation ( 35 ).
4. Spark plug according to claim 1, 2 or 3, characterized in that the shaded area (A; A '; A ") rotations tion symmetrically around the insulator base ( 20 ).
5. Spark plug according to one of the preceding claims, since characterized by several shaded areas in front are seen.
DE2000115916 2000-03-30 2000-03-30 Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction Withdrawn DE10015916A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2000115916 DE10015916A1 (en) 2000-03-30 2000-03-30 Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2000115916 DE10015916A1 (en) 2000-03-30 2000-03-30 Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction

Publications (1)

Publication Number Publication Date
DE10015916A1 true DE10015916A1 (en) 2001-10-04

Family

ID=7637034

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2000115916 Withdrawn DE10015916A1 (en) 2000-03-30 2000-03-30 Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction

Country Status (1)

Country Link
DE (1) DE10015916A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003043152A1 (en) * 2001-11-13 2003-05-22 Federal-Mogul Ignition (Uk) Limited Spark plug
WO2003083284A1 (en) * 2002-03-28 2003-10-09 Robert Bosch Gmbh Combined fuel injection valve/ignition plug
WO2005015702A1 (en) * 2003-07-29 2005-02-17 Federal-Mogul Ignition (Uk) Limited Spark plug
FR2892240A1 (en) * 2005-10-18 2007-04-20 Renault Sas Ignition candles for the internal combustion engine of a motor vehicle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003043152A1 (en) * 2001-11-13 2003-05-22 Federal-Mogul Ignition (Uk) Limited Spark plug
USRE41672E1 (en) 2001-11-13 2010-09-14 Federal-Mogul Ignition (Uk) Limited Spark plug
US7057332B2 (en) 2001-11-13 2006-06-06 Federal-Mogul Ignition (Uk) Limited Spark plug
US7077100B2 (en) 2002-03-28 2006-07-18 Robert Bosch Gmbh Combined fuel injection valve-ignition plug
WO2003083284A1 (en) * 2002-03-28 2003-10-09 Robert Bosch Gmbh Combined fuel injection valve/ignition plug
WO2005015702A1 (en) * 2003-07-29 2005-02-17 Federal-Mogul Ignition (Uk) Limited Spark plug
FR2892240A1 (en) * 2005-10-18 2007-04-20 Renault Sas Ignition candles for the internal combustion engine of a motor vehicle
WO2007045776A1 (en) * 2005-10-18 2007-04-26 Renault S.A.S Spark plug for motor vehicle internal combustion engine
US8040029B2 (en) 2005-10-18 2011-10-18 Renault S.A.S. Spark plug for motor vehicle internal combustion engine
CN101292403B (en) * 2005-10-18 2012-06-20 雷诺股份公司 Spark plug for motor vehicle internal combustion engine

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