EP0414217A1 - Distributeur d'allumage pour moteurs à combustion - Google Patents

Distributeur d'allumage pour moteurs à combustion Download PDF

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Publication number
EP0414217A1
EP0414217A1 EP90116072A EP90116072A EP0414217A1 EP 0414217 A1 EP0414217 A1 EP 0414217A1 EP 90116072 A EP90116072 A EP 90116072A EP 90116072 A EP90116072 A EP 90116072A EP 0414217 A1 EP0414217 A1 EP 0414217A1
Authority
EP
European Patent Office
Prior art keywords
electrode
distributor
distributor according
pin
rotor
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.)
Pending
Application number
EP90116072A
Other languages
German (de)
English (en)
Inventor
Horst Dipl.-Ing. Behnke
Roland Dr. Dipl.-Ing. Michal
Klaus Bahm
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.)
Doduco Solutions GmbH
Original Assignee
Doduco GmbH and Co KG Dr Eugen Duerrwaechter
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 Doduco GmbH and Co KG Dr Eugen Duerrwaechter filed Critical Doduco GmbH and Co KG Dr Eugen Duerrwaechter
Publication of EP0414217A1 publication Critical patent/EP0414217A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/021—Mechanical distributors
    • F02P7/022—Details of the distributor rotor or electrode

Definitions

  • the invention is based on an ignition distributor for internal combustion engines with a housing in which a distributor rotor is rotatably mounted, which rotor has a first electrode close to its axis of rotation and a second electrode at its end remote from the axis of rotation and an electrical line connecting the two electrodes therebetween , and with a distributor cap which closes the housing and which has a plurality of fixed electrodes which cooperate with the second electrode of the distributor rotor and has a center electrode which ends with a spark gap at a short distance from the first electrode of the distributor rotor, wherein in the pair of electrodes formed from the first electrode of the distributor rotor and the center electrode, an electrode is designed in the form of a pin.
  • Such an ignition distributor is known from DE-37 43 940 Al.
  • the first electrode of the distributor rotor which forms a spark gap together with the center electrode of the distributor cap, is designed as a socket into which the pin-shaped center electrode projects.
  • Both electrodes are made of brass, as is usual with spark gaps. So that the sparkover occurs at the lowest possible arc voltage, the aim is to keep the effective distance between the two electrodes as small as possible; it is typically 0.5 mm and should be a maximum of 1 mm.
  • the electrodes of the spark gap are not subject to mechanical wear, but the service life of the electrodes forming the spark gap has so far been unsatisfactory.
  • the present invention has for its object to provide an ignition distributor of the type mentioned with a longer life of the pair of electrodes enclosing the center electrode of the distributor cap.
  • the design of the distributor according to the invention achieves two things: the fact that the electrode which cooperates with the pin-shaped electrode is not, as in the prior art, a socket which encloses the pin-shaped electrode over its entire circumference, but rather an electrode which covers the pin-shaped If the electrode does not enclose or covers less than the entire circumference, even if there is a lack of coaxial arrangement of the sparks, it cannot always roll over to the pin-shaped electrode in the same place, but must inevitably migrate, whereby the lower the angle, the more uniform the erosion which the pin-shaped electrode is enclosed by the other electrode.
  • the pin-shaped electrode is therefore preferably surrounded by the other electrode over less than half the circumference.
  • the aggressive gases can escape more easily from the region of the two electrodes if, unlike in the prior art, the pin-shaped electrode is no longer surrounded by a closed socket. It is particularly favorable if the other electrode, together with the pin-shaped Electrode forms the spark gap, has an essentially flat surface facing the pin-shaped electrode, because then a particularly uniform erosion of the pin-shaped electrode is achieved and the escape of the aggressive gases from the electrode area is particularly easy and becomes when the pin-shaped electrode becomes the central electrode the distributor cap is further favored by the fact that the other electrode rotating with the distributor rotor provides for air movement which promotes the escape of the aggressive gases from the electrode area, particularly when the flat surface of the rotating electrode is against the longitudinal axis of the pin-shaped electrode is inclined or skewed.
  • the invention can be carried out in such a way that the pin-shaped electrode is either the center electrode of the distributor cap or the first electrode of the distributor rotor, the first possibility being preferred because it enables better ventilation of the electrode area than if the pin-shaped electrode were attached to the distributor rotor .
  • an extension of the distributor rotor protrudes into this space, which like a fan blade for an additional one Air circulation ensures.
  • the first electrode of the distributor rotor can be part of this extension provided for the air circulation or can be separated from it, for example diametrically opposite it with respect to the axis of rotation.
  • the pin-shaped electrode is partially surrounded by the other electrode, it can be beneficial for the ventilation of the electrode area to make the surrounding electrode perforated.
  • Another way to improve the ventilation of the electrode area is to provide a through hole in the distributor rotor in the region of the pin-shaped electrode, which is expediently opposite the pin-shaped central electrode of the distributor cap, but does not have to run in the direction of the axis of rotation, but preferably runs obliquely to the axis of rotation , whereby a pumping effect is achieved.
  • ventilation consists of arranging the pin-shaped electrode and the other electrode not next to one another, but opposite one another, so that the sparkover occurs from the tip of the pin-shaped electrode to the opposite electrode, which preferably faces the pin-shaped electrode with a flat surface which is larger than that Cross-sectional area of the pin-shaped electrode, so that deviations from a precisely coaxial arrangement are harmless for the operation of the spark gap.
  • Another way of improving the ventilation of the spark gap is to provide the first electrode of the distributor rotor with a projection on its side facing the pin-shaped central electrode of the distributor cap, in particular with a rib parallel to the pin-shaped electrode, which has the effect of a fan blade .
  • This projection is made of a material with a higher wear resistance than the electrode has in the area outside the projection; Outside the area of the projection, where the electrode is not exposed to spark discharge, it can consist of an easily processable, electrically highly conductive material, such as copper or brass, on which the more wear-resistant projection is welded.
  • a suitable choice of materials can be used to achieve more wear-resistant electrodes in different ways.
  • One possibility is to manufacture the electrode from a material or to equip it with a material that is nobler than copper.
  • Materials which contain at least 20% by weight of silver or at least 10% by weight of palladium are particularly suitable, in particular silver-nickel composite materials or palladium-copper alloys.
  • Materials made of silver with 10 to 40% by weight, preferably 30% by weight of nickel or made of palladium with 10 to 30% by weight, preferably 15% by weight of copper are particularly suitable.
  • Such materials are known per se for use as electrical contacts, as materials for electrodes in spark gaps however unusual. Thanks to their precious metal content, they show increased chemical resistance to the aggressive gases that are created by spark discharge.
  • Another advantageous way of increasing the chemical resistance of the electrodes is to manufacture them from materials or to equip them with materials that are coated with a passivating cover layer.
  • materials from the group of alloys of copper with nickel are particularly suitable, the nickel content expediently being between 10 and 40% by weight, preferably about 30% by weight; by adding a little iron (1 to 2% by weight) the chemical resistance can be further improved.
  • Materials made of chromium-alloyed steels are also suitable for the electrodes because they protect themselves from the attack of aggressive gases with a passivating cover layer made of chromium oxide. These materials, which are coated with a passivating cover layer, are also not common for electrodes in spark gaps.
  • Electrodes with a lower electron work function require a lower arc voltage for the sparkover and this means that the sparkover is accompanied by a lower energy conversion. This not only reduces electrical losses in the distributor, but also produces less reactive gases.
  • the distributor cap 1 From the housing of the ignition distributor, only the distributor cap 1 is shown, which has a pin-shaped center electrode 2 and, distributed around its circumference, a plurality of fixed electrodes 3 parallel to the center electrode 2, which have electrode surfaces 3 a facing the center electrode 2 on the inside of the distributor cap.
  • the ignition distributor there is a distributor rotor 4 which can be rotated about an axis 5 which runs coaxially with the central electrode 2.
  • the flat base body of the distributor rotor has three bores 6, 7 and 8 for fastening the distributor rotor to the end of the camshaft of an internal combustion engine, the housing (engine block) of which also forms one half of the housing of the ignition distributor, the other half of which is the distributor cap 1.
  • the distributor rotor carries two electrodes.
  • a first, elongated electrode 9 is arranged on the upper side of the base body of the distributor rotor 4, extends in the radial direction and ends tightly, namely at a distance of approximately 0.5 mm, in front of the outer surface of the cylindrical center electrode 2 of the distributor cap.
  • the distributor rotor carries a second electrode 10, which has a radially outward-facing surface, which runs past the surfaces 3a of the fixed electrodes 3 at a small distance when the distributor rotor rotates.
  • the electrodes 9 and 10 are connected to one another by an electrical line 11 embedded in the distributor rotor.
  • the first electrode 9 of the distributor rotor which cooperates with the central electrode 2 is a cuboid electrode which has a flat end face 9a facing the central electrode 2.
  • the normals of the radially extending surfaces of the electrode 9 enclose an angle of approximately 45 ° with the axis of rotation 5 of the distributor rotor 4.
  • the electrode 9 acts like a fan blade, which ensures air circulation in the space between the distributor rotor 4 and the distributor cap 1.
  • the air circulation is reinforced by an extension 12 of the distributor rotor diametrically opposite the electrode 9. Due to the air circulation, a constant air exchange takes place in the area of the spark gap, which is formed between the center electrode 2 and the first electrode 9 of the distributor rotor, which removes the aggressive gases accompanying the flashover, thereby removing the electrodes 9 and 2 from their chemical attack.
  • the center electrode 2 is not stressed on one side, but burns off evenly because the first electrode 9 of the distributor rotor is arranged on one side next to the center electrode 2 and is guided around it.
  • the invention is applicable in the field of the automotive industry (manufacturer, supplier, spare parts business).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP90116072A 1989-08-22 1990-08-22 Distributeur d'allumage pour moteurs à combustion Pending EP0414217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8910037U DE8910037U1 (de) 1989-08-22 1989-08-22 Zündverteiler für Verbrennungskraftmaschinen
DE8910037U 1989-08-22

Publications (1)

Publication Number Publication Date
EP0414217A1 true EP0414217A1 (fr) 1991-02-27

Family

ID=6842191

Family Applications (2)

Application Number Title Priority Date Filing Date
EP90116072A Pending EP0414217A1 (fr) 1989-08-22 1990-08-22 Distributeur d'allumage pour moteurs à combustion
EP90912410A Expired - Lifetime EP0489056B1 (fr) 1989-08-22 1990-08-22 Allumeur pour moteurs a combustion interne

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90912410A Expired - Lifetime EP0489056B1 (fr) 1989-08-22 1990-08-22 Allumeur pour moteurs a combustion interne

Country Status (5)

Country Link
US (1) US5416292A (fr)
EP (2) EP0414217A1 (fr)
JP (1) JPH05503128A (fr)
DE (2) DE8910037U1 (fr)
WO (1) WO1991002899A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5679471A (en) * 1995-10-16 1997-10-21 General Motors Corporation Silver-nickel nano-composite coating for terminals of separable electrical connectors
US5967860A (en) * 1997-05-23 1999-10-19 General Motors Corporation Electroplated Ag-Ni-C electrical contacts

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR502536A (fr) * 1918-10-01 1920-05-18 Scintilla Soc Distributeur pour le courant de haute tension dans les magnétos d'allumage
FR525168A (fr) * 1920-09-28 1921-09-16 Charles Low Atkinson Perfectionnements dans les commutateurs pour moteurs à combustion interne
US3542976A (en) * 1967-08-18 1970-11-24 Forest J Moray Distributor cap and rotor combination with completely removable stationary electrode and broad contact face movable electrode
FR2039754A5 (fr) * 1969-03-24 1971-01-15 Webster Millard
FR2133120A5 (fr) * 1971-04-08 1972-11-24 Ducellier & Cie
DE3136745A1 (de) * 1981-09-16 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur zuendspannungsverteilung in fuer brennkraftmaschinen bestimmten zuendanlagen
DE3837808A1 (de) * 1988-11-08 1990-05-10 Bosch Gmbh Robert Zuendverteiler fuer zuendanlagen von brennkraftmaschinen

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5171445U (fr) * 1974-11-30 1976-06-05
DE2846590A1 (de) * 1978-10-26 1980-05-08 Bosch Gmbh Robert Anordnung fuer die zuendspannungsverteilung in zuendanlagen von brennkraftmaschinen
DE2949573C2 (de) * 1978-12-11 1982-06-03 Hitachi, Ltd., Tokyo Zündverteiler
US4308436A (en) * 1978-12-28 1981-12-29 Hitachi, Ltd. Distributor for internal combustion engine
JPS55144855U (fr) * 1979-04-03 1980-10-17
EP0045052B1 (fr) * 1980-07-25 1986-02-26 Nissan Motor Co., Ltd. Rotor de distributeur d'allumage à suppression d'interférence à radiofréquence
JPS5756665A (en) * 1980-09-22 1982-04-05 Toyota Motor Corp Noise wave generation restraining distributor of internal combustion engine
DE3101908A1 (de) * 1981-01-22 1982-09-02 Robert Bosch Gmbh, 7000 Stuttgart Zuendverteiler fuer brennkraftmaschinen
DE3148053A1 (de) * 1981-12-04 1983-06-09 Robert Bosch Gmbh, 7000 Stuttgart Zuendeinrichtung fuer brennkraftmaschinen
US4470385A (en) * 1982-09-20 1984-09-11 General Motors Corporation Ignition distributor
DE3613499A1 (de) * 1985-05-02 1986-11-06 Volkswagen AG, 3180 Wolfsburg Zuendverteiler fuer eine nockengesteuerte brennkraftmaschine
US4661661A (en) * 1985-10-01 1987-04-28 Chrysler Motors Corporation Spark shield and inlet air vent for an ignition distributor
DE3807791A1 (de) * 1987-02-20 1988-09-22 Mitsubishi Electric Corp Zuendverteiler fuer einen verbrennungsmotor
DE3743940A1 (de) * 1987-12-23 1989-07-06 Bayerische Motoren Werke Ag Zuendverteiler fuer brennkraftmaschinen
DE3821995A1 (de) * 1988-06-30 1990-01-11 Bosch Gmbh Robert Hochspannungs-verteiler fuer zuendanlagen von brennkraftmaschinen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR502536A (fr) * 1918-10-01 1920-05-18 Scintilla Soc Distributeur pour le courant de haute tension dans les magnétos d'allumage
FR525168A (fr) * 1920-09-28 1921-09-16 Charles Low Atkinson Perfectionnements dans les commutateurs pour moteurs à combustion interne
US3542976A (en) * 1967-08-18 1970-11-24 Forest J Moray Distributor cap and rotor combination with completely removable stationary electrode and broad contact face movable electrode
FR2039754A5 (fr) * 1969-03-24 1971-01-15 Webster Millard
FR2133120A5 (fr) * 1971-04-08 1972-11-24 Ducellier & Cie
DE3136745A1 (de) * 1981-09-16 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur zuendspannungsverteilung in fuer brennkraftmaschinen bestimmten zuendanlagen
DE3837808A1 (de) * 1988-11-08 1990-05-10 Bosch Gmbh Robert Zuendverteiler fuer zuendanlagen von brennkraftmaschinen

Also Published As

Publication number Publication date
US5416292A (en) 1995-05-16
DE8910037U1 (de) 1991-01-17
EP0489056B1 (fr) 1994-10-12
EP0489056A1 (fr) 1992-06-10
JPH05503128A (ja) 1993-05-27
DE59007467D1 (de) 1994-11-17
WO1991002899A1 (fr) 1991-03-07

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