EP0579926A2 - Distributeur pour systèmes d'allumage de moteur à combustion interne - Google Patents

Distributeur pour systèmes d'allumage de moteur à combustion interne Download PDF

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Publication number
EP0579926A2
EP0579926A2 EP93108314A EP93108314A EP0579926A2 EP 0579926 A2 EP0579926 A2 EP 0579926A2 EP 93108314 A EP93108314 A EP 93108314A EP 93108314 A EP93108314 A EP 93108314A EP 0579926 A2 EP0579926 A2 EP 0579926A2
Authority
EP
European Patent Office
Prior art keywords
electrode
cap
distributor
rotor
ignition
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Withdrawn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
EP93108314A
Other languages
German (de)
English (en)
Other versions
EP0579926A3 (fr
Inventor
Richard Gerber
Hartmut Brammer
Albert Gerhard
Karsten Dipl.-Ing. Grasshoff (Fh)
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 EP0579926A2 publication Critical patent/EP0579926A2/fr
Publication of EP0579926A3 publication Critical patent/EP0579926A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/60—Devices for interrupted current collection, e.g. commutating device, distributor, interrupter
    • 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
    • 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
    • F02P7/025—Mechanical distributors with noise suppression means specially adapted for the distributor

Definitions

  • the invention is based on an ignition distributor for ignition systems of internal combustion engines according to the preamble of claim 1.
  • the electrodes, the center electrode and the distributor electrodes are integrated in the plug of the ignition lines.
  • the plugs snap into place when plugged into the distributor cap.
  • the distributor cap can be manufactured without insert parts.
  • the ignition pulse which is conducted from the center electrode to the rotor electrode and from there to the distributor electrodes, has to overcome a spark gap at the input and at the output of the rotor electrode.
  • a high thermal load occurs on the material adjacent to the spark gap and there is a loss of ignition energy, which must be compensated for by a larger dimensioning of the ignition system.
  • Ignition distributors are also known, in which a closed electrical connection is provided between the center electrode and the rotor electrode Connection exists.
  • the disadvantage of these ignition distributors is that an electrode must be pressed into the distributor cap. This serves on the one hand to make contact with a central dome plug, via which the ignition energy is supplied, and on the other hand to mount a contact part which transmits the ignition energy to the rotor electrode.
  • This contact part is usually designed as a carbon pen and is prone to wear.
  • an exchange of the coal is no longer possible because of its inseparable integration into the electrode pressed into the distributor cap, which undesirably limits the service life of the ignition distributor cap.
  • the ignition distributor according to the invention with the characterizing features of claim 1 has the advantage that the aforementioned shortcomings are avoided to a satisfactory extent.
  • the ignition distributor only has a spark gap between the rotor electrode and the outer electrodes, so that, owing to the closed electrical connection between the center electrode and the rotor electrode, there is less ignition energy loss and more ignition energy is available.
  • the central electrode is part of the central dome connector, which can be inserted and locked in the captive cap so that it cannot be lost.
  • the distributor cap can be manufactured cost-effectively without insert parts.
  • the contact part can be dismantled and replaced after wear, as a result of which the operating life of the ignition distributor cap can be extended.
  • the center electrode contains an easily producible blind hole as a guide element for the spring element and the contact part, the contact part being able to laterally deflect through the chamfer of the blind hole in the region of its outlet opening when the distributor cap is mounted on the distributor housing.
  • an interference suppression resistor is easily contacted with the electrode and these parts and the connection of the interference suppression resistor are held together and protected by a common plastic sheathing.
  • the guide element for the center electrode is embodied by a hole in the plastic casing itself, thereby simplifying the guide for the center electrode.
  • the formation of a spring arm with an outer shoulder on the plastic casing provides a releasable snap-in connection between the plastic casing carrying the center electrode and the distributor cap.
  • FIG 1 shows a longitudinal section of a detail of an ignition distributor and FIGS. 2-4 embodiments of central electrodes which can be detached from the distributor cap via latching elements.
  • a cap 11 is shown from an ignition distributor in FIG. 1, which is encased by a protective hood 12. Within the cap 11 there is a distributor rotor 13 which sits on the end of a drive shaft 14 and is connected to it in a rotationally fixed manner.
  • the distributor rotor 13 has a rotor finger 16, in which a rotor electrode 17 is inserted or embedded.
  • the rotor electrode 17 extends in the radial direction along the rotor finger 16 and has a first free end 18 and a second free end 19.
  • the first free end 18 is arranged in axial alignment with the drive shaft 14 on an end face 21 of the distributor rotor 13 facing away from the drive shaft, while the second free end 19 forms a distribution circuit and has the distributor function.
  • the cap 11 which is in a fixed association with the distributor rotor 13, has on its end face connecting pieces 22, also called domes, which project parallel to the axis of the drive shaft.
  • the connecting pieces 22 each have a stepped bore 23 on their inner sides, the diameter of which decreases towards the distributor rotor 13 and merges into an opening 24 which penetrates a cover surface 26 of the cap 11.
  • the outer lateral surfaces 27 of the connecting pieces 22 are slightly conical, with a diameter decreasing towards an opening 28 of the connecting pieces 22.
  • the sections of the stepped bores 23 can also be made slightly conical.
  • the sockets 22 serve to receive a plurality of distributor electrodes 29 and a center electrode 31.
  • the distributor electrodes 29 are arranged on a circle with the circumference of the distributor circle or coaxially with the drive shaft 14 and with the longitudinal axis of the cap 11.
  • the distributor electrodes 29 each consist of a pin 32, the one Groove 33 and then has a radial projection 34, which serve as positive locking elements.
  • the pin 32 With its inner end, the pin 32 forms the actual electrode onto which arcing occurs from the free end 19 of the rotor electrode 17.
  • the other end of the pin 32 has a blind bore 35, into which an electrical resistor, which is designed as an interference suppressor 36, is inserted on the end face and is electrically connected to the pin 32.
  • the other end face of the interference suppression resistor 36 is electrically connected to a connecting element 37 to which a connecting cable 38 is connected.
  • connection of the connecting cable 38 to the connecting element 37 can be detachable or non-detachable, as in these exemplary embodiments.
  • part of the grommet 41 encloses the connection cable 38 and the end of an insulation 43 of the connection cable 38 which is perpendicular to the pin 32 and the resistor 36 or each distributor electrode 29.
  • one of the distributor electrodes 29 lying on the distributor circuit is shown. It forms an air gap 40 to the second free end 19 of the rotor electrode 17 and it is knurled or corrugated on the surface at an end 44 associated therewith, which serves to improve the sparkover.
  • the center electrode 31 differs in structure and connection from the distributor electrode 29 only in that the pin 32 has an axial blind bore 46 which is open towards the rotor electrode 17 and in which a contact part 49 connected to a spring element 48 is inserted so as to be axially movable .
  • the blind bore 46 is axially closed off by a base 51 which at the same time also forms the end of the blind bore 35.
  • the bottom 51 forms an electrically conductive connection on the one hand to the interference suppression resistor 36 and on the other hand to the spring element 48 in the form of a compression spring.
  • the spring element 48 presses in the prestressed state on an end face of the pin-shaped contact part 49 made of carbonaceous material, which in turn is supported on the end face on the first free end 18 of the rotor electrode 17, the connection between the second free end 19, the contact part 49 and the Spring element 48 is electrically conductive.
  • the ignition pulses thus pass from the connecting cable 38 via the central electrode 31 to the rotor electrode 17 in a closed electrical connection.
  • the second free end 19 of the rotor electrode 17 is a metal part in the first embodiment.
  • the second free end 19 can be a part made of carbonaceous material and the contact part 49 can be a metal part.
  • FIG. 2 shows sections of the center electrode 31 with the blind bore 46, in which the spring element 48 and the contact part 49 are inserted so as to be axially movable.
  • the blind bore 46 has a funnel-shaped chamfer 50 in the region of an outlet opening 52.
  • the plastic sheath 39 also has one or more latching arms 53 which can be deflected elastically transversely to the axis of the central electrode 31 and which each protrude through the opening 24 when the cap 11 is fitted and snap in with a lug 57 forming a latching surface 54 to the inner wall 56 of the cap 11 when inserting the electrodes 29, 31 on the inner wall 56 and thus fix the electrodes 29, 31 in the inserted position.
  • the ends 44 of the distributor electrodes 29 (FIG. 1) and the ends of the contact parts 49 (FIGS. 1, 2) each project axially beyond the plastic sheathing 39 and are thus free.
  • the latching arms 53 are replaced by spring arms 59 which are cut out of a lateral surface 61 of the pin 32 by punching out and which, starting from the outlet opening 52, are spread apart from the lateral surface 61 and have the same function as the latching arms 53 on the Inner wall 56 of the cap 11 can be supported.
  • the plastic sheathing 39 can be made shorter and made simpler.
  • a plastic sheath 69 comprises an interference suppression resistor 66 and part of the center electrode 31 formed by the spring element 48 and the contact part 49.
  • the spring element 48 is supported on an end face of the interference suppression resistor 66 from.
  • the spring element 48 and a section of the contact part 49 are axially displaceably mounted in a bore 62 forming the guide element for the center electrode 31 in the plastic casing 69.
  • Contact part 49, spring element 48 and interference suppression 66 are connected in an electrically conductive manner.
  • the plastic sheath 69 has at least one spring arm 72, which can be deflected elastically from its outer surface 71 transversely to the axis of the central electrode 31, with an outer shoulder 73 which can be supported on an inner wall 74 of the cap 11 and can be returned to the outer surface 71.
  • All four exemplary embodiments have in common that the latching arms 53 and the spring arms 59; 72 can be pivoted in radially, thus ensuring that the electrodes 29, 31 can be removed from the cap 11.
  • the spring element 48 and the wear-prone contact part 49 can be exchanged, as a result of which the operating time of the cap 11 and of the ignition distributor can be extended.

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)
EP93108314A 1992-06-25 1993-05-22 Distributeur pour systèmes d'allumage de moteur à combustion interne. Withdrawn EP0579926A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924220887 DE4220887A1 (de) 1992-06-25 1992-06-25 Zündverteiler für Zündanlagen von Brennkraftmaschinen
DE4220887 1992-06-25

Publications (2)

Publication Number Publication Date
EP0579926A2 true EP0579926A2 (fr) 1994-01-26
EP0579926A3 EP0579926A3 (fr) 1994-12-28

Family

ID=6461829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108314A Withdrawn EP0579926A3 (fr) 1992-06-25 1993-05-22 Distributeur pour systèmes d'allumage de moteur à combustion interne.

Country Status (3)

Country Link
EP (1) EP0579926A3 (fr)
JP (1) JPH0658236A (fr)
DE (1) DE4220887A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR953715A (fr) * 1947-10-03 1949-12-12 Ducellier Ets Perfectionnement aux distributeurs d'allumage
FR1229856A (fr) * 1959-03-23 1960-09-12 Perfectionnements aux dispositifs anti-parasites pour circuits d'allumage électrique
FR2080438A5 (fr) * 1970-02-05 1971-11-12 Bosch
DE2436438A1 (de) * 1974-07-29 1976-02-12 Bosch Gmbh Robert Zuendverteilerstecker
WO1983001981A1 (fr) * 1981-12-04 1983-06-09 Ehrmann, Karl Dispositif d'allumage pour moteurs a combustion interne
JPS58211572A (ja) * 1982-06-03 1983-12-09 Nissan Motor Co Ltd 雑音防止型点火装置
GB2154076A (en) * 1983-12-27 1985-08-29 Tokai Electric Wire Distributor cap with ignition cable
JPS60237173A (ja) * 1984-05-10 1985-11-26 Hitachi Chem Co Ltd 雑音電波抑制型配電器
DE3830608A1 (de) * 1987-09-16 1989-03-30 Mitsubishi Electric Corp Verteilerkappe und verfahren zur herstellung einer verteilerkappe
WO1990000228A1 (fr) * 1988-06-30 1990-01-11 Robert Bosch Gmbh Distributeur a haute tension pour systemes d'allumages de moteurs a combustion interne
DE3837808A1 (de) * 1988-11-08 1990-05-10 Bosch Gmbh Robert Zuendverteiler fuer zuendanlagen von brennkraftmaschinen

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR953715A (fr) * 1947-10-03 1949-12-12 Ducellier Ets Perfectionnement aux distributeurs d'allumage
FR1229856A (fr) * 1959-03-23 1960-09-12 Perfectionnements aux dispositifs anti-parasites pour circuits d'allumage électrique
FR2080438A5 (fr) * 1970-02-05 1971-11-12 Bosch
DE2436438A1 (de) * 1974-07-29 1976-02-12 Bosch Gmbh Robert Zuendverteilerstecker
WO1983001981A1 (fr) * 1981-12-04 1983-06-09 Ehrmann, Karl Dispositif d'allumage pour moteurs a combustion interne
JPS58211572A (ja) * 1982-06-03 1983-12-09 Nissan Motor Co Ltd 雑音防止型点火装置
GB2154076A (en) * 1983-12-27 1985-08-29 Tokai Electric Wire Distributor cap with ignition cable
JPS60237173A (ja) * 1984-05-10 1985-11-26 Hitachi Chem Co Ltd 雑音電波抑制型配電器
DE3830608A1 (de) * 1987-09-16 1989-03-30 Mitsubishi Electric Corp Verteilerkappe und verfahren zur herstellung einer verteilerkappe
WO1990000228A1 (fr) * 1988-06-30 1990-01-11 Robert Bosch Gmbh Distributeur a haute tension pour systemes d'allumages de moteurs a combustion interne
DE3837808A1 (de) * 1988-11-08 1990-05-10 Bosch Gmbh Robert Zuendverteiler fuer zuendanlagen von brennkraftmaschinen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 105 (M-471) 19. April 1986 & JP-A-60 237 173 (HITACHI KASEI KOGYO KK) 26. November 1985 *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 61 (M-284) 23. März 1984 & JP-A-58 211 572 (NISSAN JIDOSHA KK) 9. Dezember 1983 *

Also Published As

Publication number Publication date
EP0579926A3 (fr) 1994-12-28
DE4220887A1 (de) 1994-01-05
JPH0658236A (ja) 1994-03-01

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