EP0056957A1 - Distributeur pour moteur à combustion interne - Google Patents

Distributeur pour moteur à combustion interne Download PDF

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Publication number
EP0056957A1
EP0056957A1 EP82100244A EP82100244A EP0056957A1 EP 0056957 A1 EP0056957 A1 EP 0056957A1 EP 82100244 A EP82100244 A EP 82100244A EP 82100244 A EP82100244 A EP 82100244A EP 0056957 A1 EP0056957 A1 EP 0056957A1
Authority
EP
European Patent Office
Prior art keywords
distributor
electrically
noise
distributor according
resistive
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.)
Ceased
Application number
EP82100244A
Other languages
German (de)
English (en)
Inventor
Iwao Imai
Masazumi Sone
Hiroshi Endo
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0056957A1 publication Critical patent/EP0056957A1/fr
Ceased 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
    • F02P7/025—Mechanical distributors with noise suppression means specially adapted for the distributor

Definitions

  • the present invention relates generally to a distributor for an internal combustion engine, and more particularly to a distributor having means for reducing noise generated from the distributor.
  • An ignition system for an internal combustion engine generates electromagnetic noise (hereinafter, referred to simply “noise”) which has wide frequency range and high intensity so that the noise will interfere with television and radio receiver over a broad area.
  • electromagnetic noise hereinafter, referred to simply "noise”
  • a resistive ignition plug and a resistive high-voltage cable connecting the plug and the distributor which applies current at a high voltage to the plug.
  • Such a conventional noise eliminator is effective only against noise generated by the plug.
  • the noise is generated not only by the plug, rather, the distributor also generates noise. sufficiently strong to cause interference.
  • an internal combustion engine comprises a plurality of cylinders.
  • a conventionally-used distributor comprises a rotating electrode segment connected to an ignition coil and a plurality of peripheral electrodes, each connected to an ignition plug provided. with in a corresponding cylinder.
  • the noise from the distributor is caused by discharging from the rotating conductor to the peripheral electrode.
  • a plurality of insulating conduits are integrally formed vertically in the top surface of a distributor cap in order to protect a connection member between each electrode and a high-voltage cable.
  • the insulating conduits can be integrally formed on the side surface of the distributor cap so as to eliminate upward projections, thereby allowing the cap to be shortened. Further, such a structure also improves the ease of connecting or disconnecting the high-voltage cable to or from the cap. However, the latter structure allows more noise generation than the former.
  • Another object of the present invention is to provide a distributor suitable for an internal combustion engine equipped with a complicated ignition system such as a plurality of cylinders each of which is equipped with a plurality of ignition plugs.
  • Another object of the present invention is to provide a distributor which has a compact construction.
  • a distributor for an internal combustion engine comprises a first means for electrically connecting a central electrode which contacts a rotating conductor and a connector which can engage one end of a high-voltage cable connected to an ignition coil, at least a part of the first means being made of resistive material; and a second means for electrically connecting each peripheral electrode segment facing the rotating conductor to each connector engaging one end of the high-voltage cable connected to an ignition plug, at least a part of the second means being made of resistive material.
  • FIG. 1 there is shown a vertical cross-sectional view of one typical prior-art distributor which is formed with a plurality of vertical insulating conduits on the distributor housing-in which a governor advancer or a vacuum advancer is housed and a rotor shaft 12 is rotatably disposed at substantially the center thereof.
  • a disc-shaped rotating member 14 is fixed to the free end of the shaft 12 so as to rotate therewith.
  • the rotating member 14 is generally made of plastic resin such as polypropylene.
  • a rotating conductor 16 is integrally secured on the upper surface of the rotating member 14.
  • a distributor cap 18 is'secured so as to cover the rotating member 14.
  • the cap 18 is provided with a plurality of peripheral electrodes 20 in such manner that one end of the peripheral electrode 20 faces the free end of the rotating conductor 16 across a discharge gap 22.
  • the other end of the peripheral electrode 20 is connected to an ignition plug (not shown) via a high-voltage cable 24.
  • the distributor cap 18 is provided with a carbon electrode 26 at the center of the cap 18.
  • the upper end of the central electrode 26 is connected to an ignition coil (not shown) through an electrically conductive spring 28, a connector 30, and a high-voltage cable 32.
  • the spring 28 urges the central electrode 26 into continuous contact.with the rotating conductor 16 so that electric current flows from the central electrode 26 to the peripheral. electrode 20 through the rotating conductor 16 and the discharge gap 22.
  • the distributor cap 18 of the distributor shown in Fig. 1 is integrally formed with a plurality of insulating conduits 34 and 36 to protect connection members between the high voltage cables .24 and 32 and the peripheral electorde 20 or the central electrode 26 in such manner that the conduits project upwards from the top surface of the cap 18.
  • FIGs. 2 and 3 there is shown another type of conventional distributor, the cap of'which is provided with a plurality of insulating conduits. arranged horizontally on the side surface thereof.
  • Such a structure is intended to decrease the height of the distributor cap so as to minimize projections from the engine, and improve ease of mounting or dismounting the high voltage cable onto or from the terminal of the distributor.
  • Figs. 2 and 3 are respectively plan and side cross-sectional views in which solid lines represent the outlines of the resin molded parts of the distributor cap and electric members such as an electrodes, terminals, leads and so on, are designated by hatching.
  • This type of distributor is designed so as to be used for a four- cylinder internal combustion engine, each cylinder of which is equipped with twin ignition plugs.
  • the distributor comprises two central electrode elements connected to an ignition coil system which applies high-voltage current to them and a set of four peripheral electrodes corresponding to each central electrode element, i.e., a total of eight peripheral electrodes.
  • the reference numeral 40 denotes a distributor cap which is integrally formed with two insulating conduits 42A and 42B and eight insulating conduits 44A, 46A, 48A, 50A, 44B,. 46B, 48B and. 50B projecting horizontally from the side surface of the cap.
  • the insulating conduit 42A houses a connector 52A which engages with one end of a high voltage cable (not shown) connected to an ignition coil system (not shown) in the same manner as described with reference to Fig. 1.
  • the insulating conduit 42B also houses a connector 52B which engages with one end of a high voltage cable (not shown) connected to the ignition coil system (not shown).
  • the insulating conduits 44A, 46A, 48A and 50A house connectors 54A, 56A, 58A and 60A, respectively.
  • the inksulating conduits 44B, 46B, 48 B and 50 B house connectors 54B, 56B, 58B and 60B, respectively. These connectors each engage with one end of high voltage cables (not shown) connected to corresponding ignition plugs (not shown), respectively.
  • the connectors 52A and 52B are respectively connected to central electrodes 62A and 62B through leads 64A and 64B and coil springs 66A and 66B, which are made of an electrically conductive material.
  • the central electrode 62A and coil spring 66A cannot be seen since they are behind the central electrode 62B- and coil spring 66B.
  • the bottom points of each of the central electrodes 62A and 62B slidingly contact the upper surface of rotating electrode 68.
  • the reference numerals 70A, 72A, 74A, 76A, 70B, 72B, 74B and 76B denote peripheral electrodes which are arranged in such a manner that they face the rotating electrode 68 through a discharge gap at the point of closest approach.
  • the electrodes 70A, 72A, 74A, 76A, 70B, 72B, 74B, and 76B and the connectors 54A, 56A, 58A, 60A, 54B, 56B, 58B and 60B respectively are electrically connected by means of leads, made of electric conductive material, 80A, 82A, 84A, 86A, 80B, 82B, 84B and 86B, respectively.
  • the conventional distributor having such a structure generates more noise than the first structure in which insulating conduits are formed vertically on the distributor cap. That is, the leads are relatively long so that they act as antennae which radiate effectively the noise generated by the discharge between the rotating electrode and the side electrode. For instance, if the length of a lead increases 1 cm, the noise level will increase by about one decibel.
  • Fig. 4 there is shown a graph which represents a comparison between the levels of noise generated by the structure of Fig. 1 (refer to the dotted line b) and that of -Fig. 2 (refer to the solid line a). According to this graph, the solid line a is about 5 dB high than the dotted line b.
  • Fig. 5(a) is a schematic cross-sectional view of a first embodiment according to the present invention.
  • This embodiment includes an electrically conductive element comprising connector 60B, lead 86B and electrode 76B and is shown in the state before assembly of the distributor cap.
  • identical reference numerals denote corresponding elements or parts so that descriptions will not be repeated.
  • This first embodiment further comprises an electrically resistive member 88 inserted between the connector 60B and the lead 86B.
  • the electrically resistive member 88 can be a carbonaceous-composition-type resistor, a carbon-coated resistor or a metal wire coil resistor.
  • the resistive member 88 is electrically connected to the lead 86B and the connector 60B through solder joints 90 and .92.
  • the resistive member 88 is pre-molded in resin 94.
  • Fig. 5(b) is a side view of the embodiment of F ig. 5(a).
  • Figs. 6(a), 6(b) and 6(c) there is shown a second embodiment of the present invention.
  • Fig. 6(a) and F ig. 6(b) are a cross-sectional plan view and a cross-sectional side view, respectively.
  • Fig. 6(c) is a partially-enlarged view of Fig. 6(b).
  • the lead 86B is replaced by an electrically resistive member which comprises an insulating base plate 96 and a resistive layer 98 provided thereon.
  • the resistive member is electrically connected to the connector 60B and the electrode 76B by means of solder joints 90 and 92 and clamps 100 and 102.
  • the insulating base plate 96 is made of a ceramic or a heat-resistant resin.
  • the resistive layer 98 is formed on the plate 96 by means of printing and calcination of a thermosetting resistive paste or vacuum evaporation or injection molding of resistive material. Further, the resistive member is covered by resin 94 in the same manner as the first embodiment.
  • the resistive member 104 used for this embodiment is made of a core of graphite fiber coated with a resin 94 in a suitable shape, such as that of the lead 86B.
  • the resistive member 104 is electrically connected between the connector 60B and the elecrode 76B in such manner that the ends of graphite fiber core 104 overlapping the ends of connector 60B and the electrode 76B are secured by clamps 106 and 108, respectively. Further, if conductive needles 110 connected to the clamps are inserted into the ends of the graphite fiber core 104, the connections between the core 104 and the connector 60B and the electrode 76B will be further improved.
  • the shape of the lead member is changeable in accordance with number of cylinders or ignition plugs and the type of ignition system, any shape of the lead member can be replaced by a resistive member in the manner stated above.
  • the electrically conductive element containing the resistance member can be arranged and molded into the distributor cap in the conventional manner.
  • the electrically resistive member can also be an electrically conductive rubber of suitable resistivity or a resin containing densely dispersed metal powders.
  • the resistive member 88 in Fig. 5 Assuming that the total resistance value of the resistive member 88 in Fig. 5 is in the range of 1 K ⁇ to . 10 K ⁇ the resistive member 88 will function as a localized resistor along the lead 86b. On the other hand, assuming that the resistance value per length of the resistive members in Figs. 6 and 7 is about 10 to 20 K ⁇ /m. substantially the same effects as with a resistive high-voltage cable will be obtained. These resistive members will form a frequency filter in conjunction with the dispersed capacitance of the lead 86b so that high frequency noise will be attenuated, thereby decreasing the radiation of noise from the lead members.
  • Fig. 8 is a graph containing comparative data with respect to the noise levels radiated from a conventional distributor and the distributor of the present invention.
  • O decibels is equivalent to 1 pV/m/kHz.
  • the curve (1) represents the result from the conventional distributor according to Fig. 2, in which the length of the longest lead member is about 10 cm.
  • the curve (2) represents the result from the currently- disclosed distributor, which is of substantially the same structure except for replacement of the lead members by similarly-shaped lead members prepared as shown in Fig. 5 (the total resistance; 5 K ⁇ ).
  • the curve (3) represents the result from the disclosed distributor according to Fig. 6 (the average resistivity; 5 K ⁇ /10 cm).
  • the measuring conditions are as follows:
  • the distributor according to Fig. 5 shows excellent noise preventive characteristics in the lower frequency range
  • the distributor according to Fig. 6 shows excellent characteristics in the higher frequency range. Either distributor can reduce the noise level by about 5 to 15 decibels.
  • the lead members which are most.likely to generate noise, are replaced by lead members having electrical resistance, the noise generated by electrical discharge can be reduced by the filtering effect of the resistance, thereby decreasing the radiation of noise from the distributor.
  • the structures according to Figs. 6 and 7 can be used for the distributor in which the lead members are closely packed since the resistive members can be formed into thin plates. Further, the resistive leads of the present invention have a less deleterious effect on the insulation between lead members.
  • the resistance members according to. Figs. 6 and 7 are relatively long so that they are less influenced by self-induced capacitance. Accordingly, the distributor constructed according to Figs. 6 and 7 can effectively prevent the radiation of high frequency noise.

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)
EP82100244A 1981-01-22 1982-01-14 Distributeur pour moteur à combustion interne Ceased EP0056957A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP724981A JPS57122165A (en) 1981-01-22 1981-01-22 Current distributor for internal combustion engine
JP7249/81 1981-01-22

Publications (1)

Publication Number Publication Date
EP0056957A1 true EP0056957A1 (fr) 1982-08-04

Family

ID=11660742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100244A Ceased EP0056957A1 (fr) 1981-01-22 1982-01-14 Distributeur pour moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0056957A1 (fr)
JP (1) JPS57122165A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2700224A1 (fr) * 1993-01-07 1994-07-08 Sagem Allumage Procédé d'antiparasitage et tête antiparasitée de distributeur de véhicule automobile.
US5629694A (en) * 1995-01-24 1997-05-13 Hewlett-Packard Company Computer keyboard with power control key

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106286074B (zh) * 2016-08-29 2018-03-23 宁波市贤龙汽车配件有限公司 一种汽车分电器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR886175A (fr) * 1941-09-27 1943-10-07 Bosch Gmbh Robert Disque de distributeur à couvercle pour installations d'allumage de moteurs à combustion interne
US3404245A (en) * 1965-02-13 1968-10-01 Bosch Gmbh Robert Distributor cap for an ignition distributor consisting of thermoplastic synthetic material
DE2005195A1 (de) * 1970-02-05 1971-08-19 Bosch Gmbh Robert Verteilerkappe fur Zündverteiler von Brennkraftmaschinen
FR2361548A1 (fr) * 1976-08-12 1978-03-10 Nissan Motor Dispositif de controle pour des presses mecaniques
FR2369437A1 (fr) * 1976-10-27 1978-05-26 Bosch Gmbh Robert Dispositif pour la distribution de l

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR886175A (fr) * 1941-09-27 1943-10-07 Bosch Gmbh Robert Disque de distributeur à couvercle pour installations d'allumage de moteurs à combustion interne
US3404245A (en) * 1965-02-13 1968-10-01 Bosch Gmbh Robert Distributor cap for an ignition distributor consisting of thermoplastic synthetic material
DE2005195A1 (de) * 1970-02-05 1971-08-19 Bosch Gmbh Robert Verteilerkappe fur Zündverteiler von Brennkraftmaschinen
FR2361548A1 (fr) * 1976-08-12 1978-03-10 Nissan Motor Dispositif de controle pour des presses mecaniques
FR2369437A1 (fr) * 1976-10-27 1978-05-26 Bosch Gmbh Robert Dispositif pour la distribution de l

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2700224A1 (fr) * 1993-01-07 1994-07-08 Sagem Allumage Procédé d'antiparasitage et tête antiparasitée de distributeur de véhicule automobile.
US5629694A (en) * 1995-01-24 1997-05-13 Hewlett-Packard Company Computer keyboard with power control key

Also Published As

Publication number Publication date
JPS57122165A (en) 1982-07-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19821112

STAA Information on the status of an ep patent application or granted ep patent

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18R Application refused

Effective date: 19840908

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SONE, MASAZUMI

Inventor name: ENDO, HIROSHI

Inventor name: IMAI, IWAO