Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T13/00—Sparking plugs
  • H01T13/02—Details
  • H01T13/04—Means providing electrical connection to sparking plugs

Definitions

• the invention relates to a spark plug connector for an internal combustion engine with a plug contact for the electrode connection of a spark plug, with a plug sleeve enveloping the plug contact, with a connection for an ignition cable, with a one-piece, rigid and load-bearing plug sleeve made of an insulating
• Spark plug connector is guided in the candle shaft
• Diesel injection nozzles were replaced by spark plugs. These spark plugs were located very deep in the so-called plug shaft, where the tip of the injection nozzle was previously installed in the cylinder head.A connection to the ignition coil was made using insulated or non-insulated metal extensions and an additional plug-in ignition cable
• a spark plug connector is known in which an insulating elastomeric shoe is provided with a rigid shell made of a thin, strong and insulating material such as plastic. This combination only serves to improve the removal of the spark plug connector. The dielectric strength is not increased thereby
• spark plug connector which has a one-piece, stiff and load-bearing connector sleeve, which consists of an insulating material this is elastically sealed. This should make it easier to insert the spark plug connector.
• the material of the connector sleeve has a high melting point and high dielectric strength, such as polytetrafluoroethylene (PTFE), b) the gap between the connector sleeve and the ceramic shaft of the spark plug is sealed by an elastic means attached to the connector sleeve, through which the spark plug connector when plugged in is guided on the spark plug, c) a ceramic inlet is provided in the plug sleeve, which encloses the plug contact and the ignition cable connection, the plug contact and the ignition cable connection being embedded in the ceramic inlet such that the ceramic in the axial direction via the plug contact and the connection for the Ignition cable protrudes
• PTFE polytetrafluoroethylene
• a plug sleeve made of such a material, which extends through the air gap to the candle well, increases the dielectric strength very significantly if it is sealed against the candle well on the one hand and the spark plug on the other hand once the plug contact for the spark plug and the ignition cable connection against arcing in the longitudinal direction and to the side. This also improves the dielectric strength
• the engine parameters such as temperature, pressure, mixture formation in the cylinder and the electrode spacing of the spark plug have determined the voltage that the ignition coil must provide so that the spark makes its way to the ground.
• the ignition voltage supplied by the ignition coil to the electrode drops due to losses in the connection, in particular in the area of transition points, such as at the plug contact and at the ignition cable connection, there is a risk that electrode bridges form, electrode bridges form, then none can form
• spark formation Misfiring occurs.
• the spark plugs must be replaced. Due to the high dielectric strength and the optimal shielding of the ignition voltage against ground, a high ignition voltage of approx. 50-60 kV can now be available at the electrode and ensure reliable ignition, since it is due to the good Shielding against leakage currents and arcing at other points does not result in electrode bridges and the service life of the spark plug is significantly extended. The service life is extended by the order of 3 to 5 times known ignition connections
• the ignition connection from the ignition cable with the integrated spark plug connector has the additional advantage that consequential damage due to misfires is avoided.
• Gas engines have reduced emissions. Catalysts These catalysts are sensitive to misfiring. then this can destroy it. Misfiring is avoided by means of the ignition connection according to the invention, then the catalyst is spared According to a further embodiment of the invention it is provided that within the
• Ceramic inlets in the cable run between the plug contact and the ignition cable connection an ohmic resistor is provided.
• the resistor suppresses electrical
• this ohmic resistance reduces the spark burning duration and the spark decay time. If the spark burning duration and the subsequent spark decay time are kept short, the material removal from the spark plugs can be reduced. This increases the service life of the spark plugs
• the resistance has a value of approximately 5 kOhm
• the connector sleeve is provided on the outside with an O-ring which closes the air gap between the outside of the connector sleeve and the wall of the candle shaft.
• the air gap is sealed in this way oil, dirt and moisture, which too the main contaminants are kept away from the candle well.
• the seal can also be made with another heat-resistant part.
• a silicone material is particularly suitable
• At least one O-ring is provided in the region of the plug base on the inner wall of the sleeve, the outer diameter of which is dimensioned such that a seal with respect to the ceramic neck of a spark plug can be produced with the O-ring Plug contact prevents contamination and thus avoids the formation of a larger contact resistance between plug contact and spark plug.
• the seal also prevents ignition currents from creeping down on the insulator and causing misfiring in the engine compartment.
• a silicone component for example a silicone Hose into consideration
• a pull ring is provided in the vicinity of the plug head, which, when the spark plug connector is mounted, is exposed outside of the cylinder for handling.
• the spark plug connector is easy to grasp and handle from the outside. This is extremely easy to assemble no longer inclined instead of pulling the spark plug connector on the ignition cable and tearing it off
• the connector sleeve has a plurality of shoulders in the receiving area of the ceramic inlet, in the areas of which the ceramic inlet and the sleeve material of the connector sleeve abut against one another in a form-fitting manner. In this way, gaps between the ceramic inlet and the connector sleeve which are responsible for possible breakdowns are avoided
• the ceramic inlet with its axial ends in contact areas of the shoulders in the axial direction is in positive contact with the plug sleeve surrounding the ceramic inlet
• this axial clamping is supplemented by radial clamping in such a way that the outer surface of the ceramic inlet is radially positively in contact with the surrounding sleeve sleeve in annular contact areas provided by means of the shoulders, so that there is spacing several contact areas between the ceramic inlet and the connector sleeve, with the help of which leakage currents can be suppressed to a considerable extent
• Fig. 3 shows a modified plug base of the spark plug connector with two O-ring seals
• the connector 1 consists of a load-bearing connector sleeve 3 made of a plastic material that has a high melting point and high dielectric strength.
• a suitable material is currently polytetrafluoroethylene (PTFE).
• PTFE polytetrafluoroethylene
• the material of the connector sleeve 3 has a thickness of approximately 5 mm.
• the connector sleeve 3 is formed in one piece and provided with a central longitudinal bore 4, which extends from the plug base 5 to the plug head 6a.
• the bore 4 is gradually expanded in the area of a ceramic inlet 7 in the direction of the plug base 5, forming shoulders 6, 8, 9 an axial inner stop for the ceramic inlet 7
• the diameter of the inner wall 3a of the connector sleeve 3 widens gradually in the area of the ceramic inlet 7 on the shoulders 8 and 9 in such a way that the outer jacket surface 10 of the ceramic inlet 7 on the shoulders 8 and 9 over their entire circumferential area around form-fitting and sealing longitudinally ringf shaped contact surfaces 1 1 and 12 against the material of the connector sleeve 3
• the shoulders 8 and 9 always result in a secure positive connection at intervals and thus an improvement in the dielectric strength
• this ceramic inlet 7 When the ceramic inlet 7 is inserted, this ceramic inlet 7 is secured on the plug-foot side by means of a retracted shoulder step 14, in the inner wall 15 of which the bore 4 has a smaller diameter than the wall area 16 lying in front of it the plug sleeve 3 inserted in the area of the plug base 5 there is an O-ring 17 on the inner wall 15, the outer diameter of which is dimensioned such that it can be used to provide a seal with respect to the ceramic neck of a spark plug (not shown).
• the plug contact 28 is thus protected against contamination, which can cause an increase in the contact resistance at this point.
• the O-ring 17 also represents an elastic guidance of the connector sleeve 3 on the spark plug. This is important since the engine vibrates during operation and undamped vibrations damage the connector contact 28. Ring 17 free vibrations between the plug sleeve 3 and the spark plug are suppressed
• Fig. 3 shows a modified Zund plug base 5 This plug base 5 is longer than that of Fig. 1, as far as the spark plug allows For better suppression of free vibrations between the spark plug connector and the spark plug in this case, two O-rings 17 are provided at a distance from each other
• the connector sleeve 3 is provided with an annular groove 19, into which a further O-ring 20 is inserted.
• This O-ring 20 ensures that the air gap 22 between the outer wall 23 of the connector sleeve 3 and the plug shaft 24 is closed for rejecting impurities such as oil, dust and the like
• longitudinal grooves 26 are provided in the area of the O-ring, which are used for ventilation and pressure compensation
• Plug sleeve 3 enables the pull ring 27 to be fitted by the fitter and thus avoids pulling on the ignition cable 33 and tearing off the ignition cable 33 While the plug sleeve 3 is formed from PTFE, which has a high dielectric strength, is easy to clean and process, the ceramic inlet 7 consists of a ceramic sleeve whose material itself also has a high dielectric strength.
• the plug contact 28 is inserted into the ceramic inlet 7 and the ignition cable connection 32 are drawn into the ceramic inlet 7, the ceramic is thus in the direction of the plug base 5 via the plug contact 28 and in the direction of the plug head 6a via the ignition cable connection 32 via the plug contact 28 merges into a conductive pin 29, which with is connected to an ohmic resistance of approximately 5 kOhm.
• the resistor 30 serves to reduce the interference voltage and to shorten the spark burning time and the spark decay time , is attached A In this way, the ignition cable 33 and the spark plug connector form an assembly unit
• a further increase in the dielectric strength can be brought about in that both the outer jacket 10 of the ceramic inlet 7, the outer jacket 22 of the connector sleeve 3 and the ignition cable 33 are provided with a silicone jacket 34, as indicated in FIG. 1.
• the ignition connection is preferably intended for operation at 50-60 kV and is characterized by a significantly improved dielectric strength and a significantly extended service life
• FIG. 3 shows in section an extension of the plug base 5 of the plug sleeve 3.
• Two O-rings 17 are provided at a distance in this embodiment.
• the second O-ring 17 improves the vibration resistance in cases in which the spark plug has a sufficiently long ceramic neck

Landscapes

• Spark Plugs (AREA)
• Connector Housings Or Holding Contact Members (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7789058

Family Applications (1)

Country Status (10)

Families Citing this family (11)

Family Cites Families (15)

• 1996
  • 1996-03-22 DE DE19611283A patent/DE19611283C1/de not_active Expired - Fee Related
• 1997
  • 1997-03-08 PT PT97919259T patent/PT888655E/pt unknown
  • 1997-03-08 AT AT97919259T patent/ATE193623T1/de active
  • 1997-03-08 ES ES97919259T patent/ES2150768T3/es not_active Expired - Lifetime
  • 1997-03-08 WO PCT/DE1997/000459 patent/WO1997036354A1/fr not_active Ceased
  • 1997-03-08 DK DK97919259T patent/DK0888655T3/da active
  • 1997-03-08 EP EP97919259A patent/EP0888655B1/fr not_active Expired - Lifetime
  • 1997-03-08 AU AU23794/97A patent/AU2379497A/en not_active Abandoned
  • 1997-03-08 US US09/155,122 patent/US6068495A/en not_active Expired - Lifetime
• 1998
  • 1998-09-11 NO NO984191A patent/NO984191L/no unknown

Non-Patent Citations (1)

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