EP0227693B1 - Connecteur de bougie d'allumage - Google Patents

Connecteur de bougie d'allumage Download PDF

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Publication number
EP0227693B1
EP0227693B1 EP86902324A EP86902324A EP0227693B1 EP 0227693 B1 EP0227693 B1 EP 0227693B1 EP 86902324 A EP86902324 A EP 86902324A EP 86902324 A EP86902324 A EP 86902324A EP 0227693 B1 EP0227693 B1 EP 0227693B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
plug connector
insulating body
connector according
section
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.)
Expired
Application number
EP86902324A
Other languages
German (de)
English (en)
Other versions
EP0227693A1 (fr
Inventor
Adalbert BÄUERLE
Walter Benedikt
Werner Herden
Walter Holl
Gerhard Liebing
Walter WÜRTH
Siegbert Schwab
Ludwig Bartelmae
Jürgen SCHMATZ
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
Publication of EP0227693A1 publication Critical patent/EP0227693A1/fr
Application granted granted Critical
Publication of EP0227693B1 publication Critical patent/EP0227693B1/fr
Expired legal-status Critical Current

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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 is based on a spark plug connector according to the preamble of the main claim.
  • a spark plug connector known from DE-OS 2 908 051
  • the one-piece insulating body is provided as a dielectric, in and on which a metallic cylinder is fastened.
  • the cylinders serve as capacitor electrodes of a capacitor integrated in the spark plug connector, which is arranged parallel to the connection between the spark plug and the ignition cable and is discharged at the time of ignition.
  • the discharge current should be combined with the ignition current of the spark plug in order to obtain a strong ignition spark.
  • the known insulating body as a dielectric, only a capacity of the spark plug connector of up to 20 pF can be achieved, which is only able to store an insufficient amount of energy.
  • a spark plug connector with spark gap is known with an outer metallic sheath which can be connected to ground and an inner metallic connecting part which is connected to the ignition cable and spark plug connection and which is arranged in an insulating body.
  • the insulating body is divided into two longitudinal sections made of ceramic and an additional capacitor with a ceramic dielectric used between them.
  • a connection electrode of the capacitor rests on the connection part, while the other connection electrode of the capacitor rests as a spring on the metallic covering or is introduced as an electrically conductive filler between the two longitudinal sections made of ceramic and is connected to the metallic covering as a ground connection.
  • the two longitudinal sections of the insulating body and the dielectric of the additional capacitor consist of ceramic with the same thermal expansion behavior, they are attached to one another with a non-elastic casting compound.
  • the known plug connector is too expensive and complicated to manufacture, so that it is not suitable for economical, possibly automated, large-scale production.
  • a spark plug connector is known, the insulating body of which consists of two longitudinal sections which are arranged at an axial distance from one another and are connected to one another via a sleeve-shaped insulating coupling.
  • the dielectric of the additional capacitor is arranged within one of the longitudinal sections in such a way that the electrodes are fastened to the end faces of the dielectric as additional conductor rings and are guided at an angle to the connecting part or to the sheath connected to ground.
  • the invention has for its object to provide a spark plug connector which not only has a capacitor, with connection electrodes already present and with a dielectric which gives the spark plug connector a capacitance of at least 50 to 500 pF, which is arranged between the longitudinal sections of the insulating body, but above it
  • a spark plug connector with simple means made of inexpensive material with a short overall length to be electrically safe and to avoid the disadvantages of the known solutions.
  • the measures provided for in the main claim are provided to solve the problem.
  • the advantage here is that a spark plug connector is economically feasible, in which the spark plug connector can be given a relatively high capacity with a relatively small dielectric.
  • the spark energy of the spark plug is amplified to such an extent that it can ignite even lean fuel vapor / air mixtures safely and over a required service life in all operating states of an internal combustion engine.
  • the ring-like elastic electrical insulation elements advantageously make it possible to use only a short longitudinal section of the insulating body made of expensive dielectric material and to form the remaining longitudinal sections of the insulating body from inexpensive known insulating materials, which, despite considerably different thermal behavior than that of the dielectric, are independent of temperature fluctuations and shaking influences the rough operation in motor vehicles remain connected to the dielectric.
  • the electrical insulating elements between the connecting part and the metallic sheath, which form the connecting electrodes of the capacitor lie firmly against the separating surfaces of the longitudinal sections of the insulating body which run transversely through the insulating body and remain elastic at all temperatures occurring in this area of the spark plug connector.
  • the measures listed in the subclaims permit advantageous developments and improvements of the spark plug connector specified in the main claim. It is particularly advantageous to produce the ring-like electrical insulating elements from silicone rubber, from suitably adjusted epoxy resin or from polymerized plastics.
  • the electrical insulating elements reliably prevent voltage breakdowns on the separating surfaces of the longitudinal section of the insulating body which forms the dielectric of the capacitor, although the separating surfaces extend in the direction of the electrical field lines at points of high electrical field strength. It is also expedient if the parting surfaces of the longitudinal sections of the insulating body have a roughness depth R z of less than 30 ⁇ m. This can be achieved with a glaze, for example.
  • the roughness depth is to be understood as the mean value from the individual roughnesses Z, to Z5 of five successive individual measuring sections.
  • a longitudinal section of the insulating body can advantageously also be designed as a sealing cap, which can be pushed onto the insulator of the spark plug in a sealing manner.
  • the metallic covering which at least at least partially surrounds the insulating body and is closed and fastened to the spark plug at ground, at the same time to provide as a suppressor jacket.
  • the drawing shows a longitudinal section through a spark plug connector on an enlarged scale.
  • a spark plug connector has an insulating body which is formed from three longitudinal sections 1, 2 and 3 and has a continuous longitudinal bore 4.
  • a connection part 5 made of electrically conductive metal is arranged in the longitudinal bore 4.
  • one end 6 of the connecting part 5 protrudes from the longitudinal section 1 of the insulating body in order to be connected to an ignition cable (not shown) in a manner known per se and not shown in detail.
  • the end 6 is provided with a thread onto which a threaded sleeve 7 is screwed until it is firmly seated with its flange 8 on the outer end face 9 of the insulating body.
  • the other end 10 of the connecting part 5 with its flange 11 is firmly pulled onto an inner ring shoulder 12 of the longitudinal section 3 of the insulating body.
  • the end 10 of the connecting part 5 is provided with a blind hole as a receiving bore 13 into which a threaded end of a connecting bolt 14 of a spark plug 15 protrudes.
  • the thread of the connecting bolt 14 snaps onto a spring ring 16, which is arranged on the outside on the end 10 of the connecting part 5 in an annular groove 17 and projects with a latching section 18 through a slot 19 into the receiving bore 13.
  • the insulating body has at its ignition cable end the sleeve-shaped longitudinal section 1 made of ceramic insulating material, for example aluminum oxide or a thermosetting plastic or thermoplastic with sufficient heat resistance.
  • the end of the longitudinal section 1 facing away from the end face 9 is widened as a flange 20 and has an end face referred to as the separating surface 21. It runs transversely to the longitudinal axis of the insulating body and thus of the spark plug connector.
  • the separating surface 21 of the longitudinal section 1 has a surface whose roughness R z should be as small as 30 11 m, preferably less than 5 ⁇ m. This shallow roughness can best be achieved by a glaze (not shown) applied to the separating surface 21, which has a layer thickness of less than 40 IJ.m and can be produced, for example, from a commercially available glass paste No. 9137 from Dupont.
  • a first electrical insulating element 22 which has the shape of an annular disk, lies tightly against the separating surface 21 of the longitudinal section 1 with one end face.
  • an end face of the longitudinal section 2 referred to as the separating surface 23, lies tightly.
  • the longitudinal section 2 is designed in the form of a cylinder sleeve as a dielectric component. Its other end face likewise forms a separating surface 24, which extends transversely to the longitudinal axis of the insulating body and against which a second electrical insulating element 25 lies tightly. It also has the shape of an annular disc.
  • the second electrical insulation element 25 lies with its end face facing away from the dielectric component 2 against the end face 26 of the longitudinal section 3 of the insulating body.
  • the two electrical insulating elements 22 and 25 consist of a material that is elastic at all temperatures occurring in this area of the spark plug connector.
  • Such an electrical insulating element 22 or 25 can consist, for example, of an annular disk made of silicone rubber, which has a thickness of 1 mm and a Shore hardness of 50, for example.
  • the thickness of such electrical insulating elements 22, 25 can also be between 0.1 and 0.2 mm.
  • a material can be used that is liquid, soft or viscous on two separating surfaces (for example positions 21 and 26; 21 and 24; 23 and 24 or 23 and 26) and after the joining of the longitudinal sections 1 to 3 of the Insulating body is optionally subjected to an aftertreatment (for example polymerization).
  • an epoxy resin or the like is suitable, which is set in accordance with the required elasticity and to which fillers such as aluminum oxide, talc, silicate have optionally been added in a known manner to compensate for the different thermal expansion behavior of the longitudinal sections 1 to 3 of the insulating body.
  • the electrical insulating elements 22, 25 can be designed as ring disks made of polymerized plastic, for example polymide, polycarbonate, polyester, polytetrafluoroethylene, polyvinyl chloride.
  • the dielectric component 2 which belongs to a capacitor of the spark plug connector, has the shape of a hollow cylinder and concentrically surrounds with its section of the longitudinal bore 4 a section of the connecting part 5 near its end on the candle side.
  • the separating surfaces 23 and 24 of the dielectric component 2 likewise have a low roughness depth R z like that of the above-described separating surface 21 of the first longitudinal section 1. They can also be coated with a corresponding glaze known per se and not shown in detail.
  • the peripheral surface 27 of the dielectric component preferably has a diameter that is slightly smaller than the diameter of the flange 20 of the longitudinal section 1 of the insulating body.
  • Both the circumferential surface 27 and the surface of the section of the longitudinal bore 4 belonging to the dielectric component 2 are provided with a surface coating, not shown, which supports the electrical contact and which can consist, for example, of a silver-palladium alloy and is 10 ⁇ m thick.
  • the dielectric component 2 consists of a material with a dielectric constant Er of 100 to 500.
  • the dielectric component 2 can consist, for example, of a mixture of calcium titanate, barium titanate, strontium titanate, bismuth oxide and lead titanate or only calcium titanate and strontium titanate.
  • a commercially available suitable substance is supplied, for example, by the Japanese company Murata under type QQ or UF.
  • the dielectric component 2 is dimensioned such that the spark plug connector has a capacitance of 50 to 500 pF, but preferably has a capacitance of 120 to 400 pF.
  • the longitudinal section 3 of the insulating body which is in contact with the electrical insulating element 25 consists of a sufficiently elastic insulating material in order to be able to be pushed with its tubular end section 28 as a sealing cap onto the insulator 29 of the spark plug 15 in a sealing manner.
  • the end section 28 is relatively thin-walled. Its inner wall 30 delimits the connection space 31 in the circumferential direction between the spark plug connection bolt 14 and the connection part 5. It starts from the inner ring shoulder 12, on which the flange 11 of the connection part 5 is held tight.
  • the outer jacket of the longitudinal section 3 has its outer diameter at its end abutting the electrical insulating element 25, merges into a tapering conical section in a central section 32 and continues in the cylindrical section of smaller diameter of the end section 28.
  • a plug housing 33 as an outer metallic sheath is essentially tubular. It is pushed so far over the insulating body that the flange 20 of the longitudinal section 1, the dielectric component 2 and the end section of the longitudinal section 3 provided with the outer diameter of the electrical insulating element 25 are completely accommodated in its inner bore 34. An expanding end section 35 of the inner bore 34 with the outer diameter of the plug housing 33 remaining the same forms a plug-on section 36 of the spark plug connector onto the hexagon 37 of the spark plug 15.
  • the plug-on section 36 is provided with narrow parallel longitudinal slots 38.
  • the plug-on section 36 of the plug housing 33 is closed to ground by the hexagon 37 of the spark plug 15.
  • the push-on section 36 can also be widened in a manner known per se at the free end and carry a tension spring in order to achieve good contact with the hexagon 37 serving as a ground connection.
  • the free end of the plug-on section 36 could also be screwed onto the metallic transition from the hexagon 37 to the insulator 29 of the spark plug 15 in order to obtain the most uniform and tight connection possible on the entire circumference of the plug-on section 36.
  • the plug housing 33 is held on the insulating body 1 to 3 by an edge 39 placed around the outside of the flange 20 of the first longitudinal section 1 of the insulating body (for example by flanging).
  • One end of a sealing spout 40 is also held by the edge 39. It is drawn onto the section of the first longitudinal section 1 protruding from the plug housing 33. Its other end sealingly surrounds the end section of the ignition cable, also not shown, in a manner known per se and not shown.
  • the capacitor of the spark plug connector consists of the dielectric component 2, which forms only a relatively short longitudinal section of the insulating body, as well as the section of the connecting part 5 enclosed by the dielectric component 2 and the section of the connector housing 33 surrounding the dielectric component 2 as capacitor electrodes.
  • the capacitor 2, 5, 33 is connected in parallel to the spark gap of the spark plug 15.
  • a contact sleeve 41 and 42 is arranged between the respective opposite surfaces of parts 5 and 2 as well as 2 and 33 for the secure electrical connection of the roller-shaped section of the connecting part 5 to the dielectric component 2 and of the dielectric component 2 to the plug housing 33 comprising the component 2 .
  • the contact sleeves 41 and 42 can each consist, for example, of a steel mesh with a small mesh size (for example 200 to 300 11 m), which is 0.1 to 0.5 mm thick.
  • a small mesh size for example 200 to 300 11 m
  • other means supporting the electrical contact between the capacitor parts 5, 2, 33 with different thermal expansion behavior can also be used, for example an electrically conductive casting compound, graphite packing or the like.
  • the annular space receiving the contact sleeve 41 and / or the contact sleeve 42 contains only gas instead of the contact sleeves 41 and 42.
  • the annular spaces contain air and are separated by the elastic ring-shaped electrical insulating elements 22; 25 sealed at the end faces.
  • the annular spaces can each form a 0.01 mm to 0.50 mm wide annular gap.
  • Each annular gap is preferably 0.05 mm to 0.30 mm wide.
  • this condenser design is first of all the simpler design, since fewer parts are required and, for example, air is used as the means which supports the contact between the condenser parts 2, 5, 33 with different thermal expansion behavior.
  • this capacitor form, arranged in the spark plug connector, for the spark plug to which the spark plug connector is plugged has the effect that the conversion of energy during the glow and arc phase is relieved and thus the spark plug wear is reduced accordingly.
  • the described embodiment of the spark plug connector can be regarded as a partially shielded spark plug connector. It can also serve as an intermediate connector, on the end 6 of which a spark plug connector can be inserted.
  • an interference suppressor is arranged between the connection end of the connection part 5 for the spark plug and the connection end 6 for the ignition cable.
  • the connecting part 5 is divided such that the candle-side end projects through the dielectric component 2 into the first longitudinal section 1 of the insulating body and is electrically conductively and mechanically connected in the bore section 4 of the longitudinal section 1 to one end of the interference suppressor accommodated there.
  • the other end of the interference suppression resistor is then connected to a connecting part of the ignition cable in a manner known per se.
  • the plug housing 33 forms both a capacitor electrode and a suppressor jacket of the spark plug connector.
  • the plug housing 33 is to be extended as an interference suppression jacket over the first longitudinal section 1 of the insulating body which comprises the interference suppression and its connection area to the ignition cable.

Landscapes

  • Spark Plugs (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Abstract

Connecteur de bougie d'allumage apte à supporter une bougie d'allumage pour un allumage fiable même de mélanges maigres vapeur de carburant/air. Le connecteur de bougie d'allumage possède une enveloppe métallique extérieure (33) qui peut être mise à la masse, et qui entoure un corps isolant divisé en sections longitudinales (1, 2, 3), à travers l'alésage longitudinal (4) duquel s'étend une pièce de connexion (5) métallique qui est reliée à un raccord de câble d'allumage et de bougie d'allumage. Une section longitudinale (2) du corps isolant, entourée par l'enveloppe métallique (33), se compose d'un matériau diélectrique et forme, avec l'enveloppe métallique (33) et la pièce de connexion métallique (5), un condensateur, qui possède une capacité de 50 à 500 pF et surtout de 120 à 400 pF. Pour empêcher la création d'un arc entre la pièce de connexion (5) et l'enveloppe (33) qui est en métal, dans la région des surfaces de séparation (21, 23, 24, 26) des sections longitudinales (1, 2, 3) du corps isolant, des éléments isolants électriques annulaires (22, 25) sont disposés entre les surfaces de séparation (21, 23 et 24, 26) qui, à toutes les températures du connecteur de bougie d'allumage, sont élastiques comme le caoutchouc silicone, la résine époxy ou le plastique polymérisé.

Claims (11)

1. Connecteur de bougie d'allumage comportant une enveloppe extérieure métallique (33) pouvant être mise à la masse et un branchement intérieur avec le câble d'allumage et la bougie d'allumage (6, 10 à 13) se trouvant en liaison avec une pièce métallique de raccordement (5) qui est placée dans un corps isolant, lequel est divisé en sections longitudinales (1,2,3) et est constituée d'un matériau dont la résistance à la chaleur et la constante diélectrique sont élevées, les enveloppes (33), la pièce de raccordement (5) et au moins un diélectrique présentant comme le connecteur de bougie d'allumage une capacité de 50 à 500 µF se trouvant entre elles, et au moins une section de la pièce métallique de raccordement (5) entourant la section longitudinale (2) du corps isolant (1, 2, 3) forment un condensateur, caractérisé en ce qu'entre les surfaces de séparation (21, 23 ; 24, 26) s'étendant perpendiculairement aux sections longitudinales (1, 2, 3) sont disposés des éléments isolants de l'électricité de forme annulaire (22, 25) qui reposent de façon fixe sur les surfaces de séparation se faisant face (21, 23 ; 24, 26) et sont constituées d'un matériau qui reste élastique à toutes températures se produisant dans cette zone du connecteur de bougie d'allumage.
2. Connecteur de bougie d'allumage selon la revendication 1, caractérisé en ce que les éléments isolants de l'électricité annulaire (22, 25) sont réalisés en élastomère de silicone.
3. Connecteur de bougie d'allumage selon la revendication 1, caractérisé en ce que les éléments isolants de l'électricité (22, 25) sont constitués de résine époxy avec, le cas échéant, de manière connue en soi, des charges incorporées pour compenser les comportements différents à la dilatation thermique des sections longitudinales divisées (1, 2, 3) du corps isolant.
4. Connecteur de bougie d'allumage selon la revendication 1, caractérisé en ce que les éléments annulaires isolants de l'électricité (22, 25) sont constitués de matière synthétique polymérisée.
5. Connecteur de bougie d'allumage selon l'une des revendications 1 à 4, caractérisé en ce que les surfaces de séparation (21, 23; 24, 26) des sections longitudinales divisées (1, 2, 3) du corps isolant ont une rugosité Rz inférieure à 30 µm.
6. Connecteur de bougie d'allumage selon la revendication 5, caractérisé en ce que les surfaces de séparation (21, 23 ; 24, 26) des sections longitudinales divisées (1, 2, 3) du corps isolant ont une rugosité Rz préférée inférieure à 5 µm.
7. Connecteur de bougie d'allumage selon l'une des revendications 1 à 6, caractérisé en ce que les surfaces de séparation (21, 23 ; 24, 26) des sections longitudinales divisées (1, 2, 3) du corps isolant sont munies d'une glaçure.
8. Connecteur de bougie d'allumage selon l'une des revendications 1 à 7, caractérisé en ce que la fente annulaire entre la pièce de raccordement (5) et le composant diélectrique (2) et/ou la fente annulaire entre le composant diélectrique (2) et le logement de prise (33) a une largeur de 0,01 à 0,50 mm et est seulement remplie d'air.
9. Connecteur de bougie d'allumage selon la revendication 8, caractérisé en ce que les fentes annulaires ont une largeur de 0,05 à 0,30 mm.
10. Connecteur de bougie d'allumage selon la revendication 1, caractérisé en ce que la section longitudinale (3) du corps isolant du côté de la bougie se transforme en coiffe d'étanchéité (28) enfilable sur l'isolateur (29) d'une bougie d'allumage (15).
11. Connecteur de bougie d'allumage selon la revendication 1, caractérisé en ce que l'enveloppe métallique (33) peut être fixée comme enveloppe de blindage sur une section mise à la masse (37) d'une bougie d'allumage (15).
EP86902324A 1985-05-31 1986-04-10 Connecteur de bougie d'allumage Expired EP0227693B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3519512 1985-05-31
DE3519512 1985-05-31
DE3600509 1986-01-10
DE19863600509 DE3600509A1 (de) 1985-05-31 1986-01-10 Zuendkerzenstecker

Publications (2)

Publication Number Publication Date
EP0227693A1 EP0227693A1 (fr) 1987-07-08
EP0227693B1 true EP0227693B1 (fr) 1989-09-06

Family

ID=25832716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86902324A Expired EP0227693B1 (fr) 1985-05-31 1986-04-10 Connecteur de bougie d'allumage

Country Status (4)

Country Link
EP (1) EP0227693B1 (fr)
DE (2) DE3600509A1 (fr)
ES (1) ES8707825A1 (fr)
WO (1) WO1986007206A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2133535C1 (ru) * 1998-12-25 1999-07-20 Открытое акционерное общество "Ухтинский завод "Прогресс" Усилитель искры трегубова
US6360706B1 (en) * 2000-03-03 2002-03-26 Delphi Technologies, Inc. Shield and spring interface to a spark plug from a pencil coil
DE202011050966U1 (de) 2011-08-11 2011-10-13 Motortech Gmbh Zündkerzenstecker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082980A (en) * 1975-02-13 1978-04-04 Murata Manufacturing Co., Ltd. Spark plug cap providing a capacitor in parallel with the spark cap
DE3024667C2 (de) * 1980-06-30 1986-01-09 Bloss, Werner Heinz, Prof. Dr.-Ing., 7065 Winterbach Zündkerzenstecker

Also Published As

Publication number Publication date
ES8707825A1 (es) 1987-08-16
DE3600509A1 (de) 1986-12-04
DE3665517D1 (en) 1989-10-12
WO1986007206A1 (fr) 1986-12-04
EP0227693A1 (fr) 1987-07-08
ES555554A0 (es) 1987-08-16

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