EP0030078B1 - Montage de bras de rotor pour utilisation dans un distributeur d'un dispositif d'allumage comportant un générateur de signal sans contact pour un système d'allumage électronique - Google Patents

Montage de bras de rotor pour utilisation dans un distributeur d'un dispositif d'allumage comportant un générateur de signal sans contact pour un système d'allumage électronique Download PDF

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Publication number
EP0030078B1
EP0030078B1 EP19800303800 EP80303800A EP0030078B1 EP 0030078 B1 EP0030078 B1 EP 0030078B1 EP 19800303800 EP19800303800 EP 19800303800 EP 80303800 A EP80303800 A EP 80303800A EP 0030078 B1 EP0030078 B1 EP 0030078B1
Authority
EP
European Patent Office
Prior art keywords
rotor arm
vane
rotor
distributor
arm
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
EP19800303800
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German (de)
English (en)
Other versions
EP0030078A1 (fr
Inventor
Clifford David Price
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0030078A1 publication Critical patent/EP0030078A1/fr
Application granted granted Critical
Publication of EP0030078B1 publication Critical patent/EP0030078B1/fr
Expired 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
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/061—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle pick-up devices without mechanical contacts

Definitions

  • This invention relates to a rotor arm assembly, and to a method of manufacturing such an assembly, for use in an ignition distributor of the kind which incorporates a contactless signal generator, for example, a Hall effect transducer, the signals from which are used to effect operation of an electronic ignition system.
  • a contactless signal generator for example, a Hall effect transducer
  • Ignition distributors are of course produced in a very wide variety of different forms and sizes, and the different forms and sizes all have in common the need for a fixed sensor and a part which is rotated in accordance with engine speed, the rotation of the moving part being sensed by the sensor to produce the output signals controlling the operation of the electronic ignition system.
  • the moving part is generally known as a vane and is commonly in the form of a disc having a peripheral flange, the flange extending at right angles to the plane of the disc and being slotted. It is known to construct an ignition distributor as original equipment including such a contactless signal generator.
  • the vane is carried by the rotor arm of the distributor, and thus rotates with the rotor arm and the rotor shaft of the distributor.
  • the vane which may be metallic, is incorporated into the moulding of the rotor arm so that the rotor arm and vane are of unitary construction.
  • US-A-3875920 also discloses the manufacture of a contactless ignition distributor as original equipment.
  • a rotor arm assembly includes an existing rotor arm manufactured without the provision of a vane, and intended for a conventional mechanical ignition distributor, and a vane for a contactless signal generator, the vane having therein a centrally disposed aperture within which a cylindrical region of the rotor arm is received as a press fit whereby the vane is attached to the rotor arm to rotate therewith, the vane being positioned on the rotor arm with its intended axis of rotation coextensive with the axis of rotation of the rotor arm, in an angular position which is determined in relation to the rotor arm such that the vane will have the desired angular relationship to the rotor shaft of the distributor when the rotor arm is engaged in the conventional manner with the rotor shaft of the distributor, and in an axial position in relation to the axis of rotation of the rotor arm such that the vane will occupy a desired axial position in relation to the sensor fitted within the distributor, again when the rotor arm is engaged
  • an adhesive is utilized to augment the press fit between the rotor arm and the vane in securing the vane to the rotor arm.
  • the assembly includes a disc-like synthetic resin flash shield secured to the rotor arm and extending between the vane and the conductive element of the rotor arm.
  • the invention further resides in a method of manufacturing a rotor arm assembly comprising selecting a rotor arm from a stock of existing rotor arms, and securing thereto, in a predetermined angular and axial position, a vane for a contactless signal generator, the vane being secured to the rotor arm by press fitting the vane onto the rotor arm.
  • the step of securing the vane to the rotor arm includes the application to the rotor arm and/or the vane of an adhesive to augment the press fit between the vane and the rotor arm in securing the vane to the rotor arm.
  • the method includes the step of machining the existing rotor arm to provide thereon a cylindrical region having its axis coextensive with the intended axis of rotation of the rotor arm, and of a diameter so related to the diameter of a centrally disposed aperture in the vane, that the vane can be engaged as a tight press fit with said cylindrical region, the machining step further providing a peripheral shoulder on the rotor arm, the shoulder extending in a plane at right angles to the axis of rotation of the rotor arm, and being at an axial location such that engagement of the vane with the shoulder ensures the correct subsequent axial location of the vane relative to the sensor of the ignition distributor when the rotor arm is engaged normally with the rotor shaft of the distributor.
  • the method includes the further step of securing a disc-like synthetic resin flash shield to the rotor arm, the flash shield lying between the vane and the conductive element of the rotor arm.
  • an ignition distributor including a contactless signal generator includes a hollow cup-shaped casing 11, supporting a rotor shaft 12 for rotation therein.
  • An open end of the casing 11 is closed by a moulded synthetic resin cap 13 the cap 13 having a high voltage input terminal 14 disposed on the axis of rotation of the rotor shaft 12.
  • a number of high tension output terminals 15 are Positioned around the terminal 14 a number of high tension output terminals 15 equal in number to the number of spark plugs of an internal combustion engine to be served by the distributor.
  • Within the casing 11 of the distributor is a fixed base plate 16 upon which is mounted the fixed sensor 17 of the contactless signal generator.
  • a rotor arm 18 being secured to the end of the shaft 12 in a predetermined angular relation to the shaft 12.
  • the rotor . arm 18 includes a moulded synthetic resin body 19 carrying a conductive element 21.
  • the element 21 co-operates permanently with the input terminal 14, and during its rotation with the shaft 12 relative to the casing 11 and cap 13 it co-operates in turn with the output terminals 15 so as to distribute high voltage sparking pulses supplied by way of the terminal 14 to the appropriate sparking plugs in turn by way of the output terminals 15.
  • the rotor arm 18 carries a moulded synthetic resin flash shield 22 in the form of a disc, the flash shield 22 minimising the risk of "flash-over" from the element 21 to the conductive casing 11 of the distributor, or to any of the conductive parts secured to the casing 11.
  • the rotor arm 18 also carries a vane 23 of the contactless signal generator.
  • the vane is in the form of a disc 24 having a peripheral flange 25, the flange 25 extending at right angles to the plane of the disc 24 and being formed with a plurality of equiangularly spaced slots 26 equal in number to the number of cylinders of the engine to be served by the ignition distributor.
  • the distributor is to serve a four cylinder engine, and thus the flange 25 of the vane 23 has four equiangularly spaced slots 26.
  • the nature of the contactless signal generator is not of particular importance to the present invention, and may for example be of the electromagnetic type known as a "Hall effect" transducer.
  • the vane is formed from mild steel, and the passage of alternately slots and solid parts of the flange 25 adjacent electromagnetic poles of the sensor 17 causes generation of appropriate output signals.
  • the generator may however be of the optical type, wherein the material of the vane is not critical, so long as it is opaque, and the sensor includes a light source and a photosensitive device, the vane alternately exposing, and obscuring the photosensitive device which thus produces a sequence of output signals again dependent upon the speed of rotation of the vane.
  • the distributor may include both or either of centrifugal, and vacuum advance systmems for varying the timing of the production of the signals in relation to the speed of rotation of the rotor shaft 12.
  • kits for converting existing mechanical distributors would be prohibitively expensive, since it would necessitate the provision of specific moulding tools for each of the different rotor arm assembly configurations which is necessary.
  • the rotor arm is internally shaped to locate on the rotor shaft 12 in a particular angular relationship to the shaft 12, and at a particular axial position relative to the terminals 14, 15 of the distributor cap. Since we utilize an existing. rotor arm in our construction then this relationship is not disturbed.
  • the vane 23 must also be mounted in a particular angular orientation relative to the rotor shaft, and in a particular axial location relative to the base plate 16 so as to cooperate correctly with the sensor 17.
  • the existing rotor arm to provide a peripheral shoulder 27 at an axial position on the rotor arm such that it can be used as an axial location for the vane, and to produce also a cylindrical region 28 having its axis coincident with the axis of rotation of the rotor arm, and having a predetermined diameter.
  • each rotor arm in this manner provides a certain standardisation of rotor arms in that in the vast majority of cases we can utilize an identical flash shield and vane for each rotor arm.
  • the diameter of the machined region 28 of the existing rotor arm is chosen in relation to the diameters of apertures in the flash shield 22 and disc portion 24 of the vane 23.
  • a conventional rotor arm 18 is selected from stock, and if necessary is machined to provide the shoulder 27 and cylindrical region 28.
  • the moulded synthetic resin disc constituting the flash shield 22 is then fitted onto the region 28 in abutment with the shoulder 27.
  • the previously manufactured vane 23 is then press fitted onto the region 28 so as to abut the flash shield 22 firmly.
  • the shoulder 27 serves to locate the axial position of the vane 23 relative to the rotor arm, and thus in use relative to the rotor shaft 12 and the base plate 16 of the distributor.
  • the apertures of the flash shield 22 and the disc 24 of the vane 23 are of course centrally disposed, and are of a diameter such that the press fitting of the vane 23 on the cylindrical region 28 entails sufficient friction to retain the vane and flash shield in engagement with the rotor arm.
  • a low viscosity adhesive is then applied to the mating surfaces of the parts permanently to bond the vane and flash shield to the rotor arm.
  • the angular position of the vane in relation to the rotor arm is controlled such that in the final assembly engagement of the rotor arm onto the rotor shaft 12 will not only locate the rotor arm in the desired angular relationship to the rotor shaft, but will also locate the vane 23 in the desired angular relationship to the rotor shaft.
  • the rotor arm and rotor shaft are formed with inter-engaging keys to provide the appropriate angular location.
  • a spire washer or similar clip may, if desired, by engaged with the rotor arm within the cup-shape of vane 23 adjacent the region 28 and bearing upon the vane 23 to assist the securing of the vane 23 and shield 22 in position on the rotor arm.
  • the vane 23 it is desirable for the vane 23 to be electrically earthed in use, that is to say to be at the same voltage as the casing 11 of the ignition distributor.
  • An electrical connection is made between the vane and the rotor shaft 12 and thus the casing 11 by means of conductive paint applied to the rotor arm either before or after assembly thereto of the vane 23.
  • the paint layer extends from the region 28 into the interior of the bore of the rotor arm and thus makes electrical connection between the vane 23 and the shaft 12 either directly or through the metal clip 30 carried within the rotor arm bore which grips the rotor shaft 12.
  • the kit for converting a conventional mechanical ignition distributor to an ignition distributor including a contactless signal generator thus comprises a rotor arm assembly incorporating a rotor arm, a flash shield, and a vane, and a sensor arrangement together with an electronic module for processing the signals produced in use by the sensor.
  • the existing mechanical distributor is then partially disembled, the contact breaker assembly being replaced by the sensor 17, and the existing rotor arm being replaced by the rotor arm assembly which will of course include a rotor arm very similar to the one which is being removed, but which carries the vane 23 and flash shield 22.

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  • 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)

Claims (7)

1. Ensemble de bras de rotor destiné à être utilisé dans un distributeur d'allumage du type qui comprend un générateur de signal sans contact, l'ensemble comprenant un bras de rotor (18) et une pale (23), la pale ayant une ouverture à travers laquelle s'étend une partie du bras du rotor, caractérisé en ce que ledit bras de rotor est .un bras de rotor existant fabriqué sans qu'il soit prévu une pale, et-destiné à un distributeur d'allumage mécanique classique, et en ce que ladite partie (28) du bras du rotor est une partie cylindrique reçue avec un ajustement serré dans l'ouverture centrale de la pale 23, grâce à quoi la pale 23 est fixée sur la bras (18) du rotor afin de tourner avec lui, la pale (23) étant positionnée sur le bras (18) du rotor avec son axe de rotation confondu avec l'axe de rotation du bras (18) du rotor, dans une position angulaire qui est déterminée par rapport au bras (18) du rotor de telle sorte que la pale (23) présente la disposition angulaire désirée par rapport à l'arbre (12) du rotor du distributeur lorsque le bras (18) du rotor est engagé de la façon classique avec l'arbre (12) du rotor du distributeur, et dans une position axiale par rapport à l'axe de rotation du bras (18) du rotor de telle sorte que la pale (23) occupe une position axiale désirée par rapport au capteur (17) monté dans le distributeur, de nouveau lorsque le bras (18) du rotor est engagé en prise de la manière normale avec l'arbre (12) du rotor du distributeur.
2. Ensemble de bras de rotor selon la revendication 1, caractérisé en ce qu'on utilise un adhésif pour augmenter l'ajustement serré entre le bras (18) du rotor et la pale (23) dans la fixation de la pale (23) sur l'arbre (18) du rotor.
3. Ensemble de bras de rotor selon la revendication 1 ou 2, caractérisé en ce qu'il comprend un écran (22) de protection contre les étincelles, en résine synthétique, analogue à un disque, fixé sur le bras (18) du rotor et s'étendant entre la pale (23) et l'organe conducteur (21) du bras (18) du rotor.
4. Procédé de fabrication d'un ensemble de bras de rotor comprenant un bras (18) de rotor portant une pale (23), ce procédé étant caractérisé par les phases consistant à: choisir un bras (18) de rotor dans un stock de bras de rotor éxistants, et à fixer sur celui-ci une pale (23), destinée à un générateur de signal sans contact, dans une position angulaire et axiale prédéterminée, la pale (23) étant fixée sur le bras du rotor (18) par ajustement serré de la pale (23) sur le bras (18) du rotor.
5. procédé selon la revendication 4, caractérisé en ce que la phase consistant à fixer la pale (23) sur le bras (18) du rotor comprend l'application au bras (18) du rotor et/ou à la pale (23) d'un adhésif pour augmenter l'ajustement serré entre la pale (23) et le bras (18) du rotor en fixant la pale sur le bras du rotor.
6. Procédé selon la revendication 4 ou la revendication 5, caractérisé en ce qu'il comprend les phases consistant: à usiner le bras (18) existant du rotor pour réaliser sur celui-ci une partie cylindrique (28) ayant son axe confondu avec l'axe prévu de rotation du bras (18) du rotor, et ayant un diamètre lié au diamètre d'une ouverture centrale de la pale (23) de telle sorte que la pale (23) puisse être engagée avec un ajustement étroitement serré avec ladite partie (28) cylindrique, la phase d'usinage réalisant en outre un épaulement périphérique (27) sur le bras (18) du rotor, l'épaulement (27) s'étendant dans un plan à angle droit par rapport à l'axe de rotation du bras (18) du rotor et étant situé dans une position axiale telle que l'engagement de la pale (23) avec l'épaulement (27) assure le positionnement axial subséquent correct de la pale (23) par rapport au capteur (17) du distributeur d'allumage lorsque le bras (18) du rotor est engagé normalement en prise avec l'arbre (12) du rotor du distributeur.
7. Procédé selon l'une quelconque des revendications 4 à 6, caractérisé en ce qu'il comprend la phase supplémentaire consistant à fixer un écran (22) de protection contre les étincelles analogue à un disque, en résine synthétique, sur le bras (18) du rotor, l'écran (22) de protection contre les étincelles étant disposé entre la pale (23) et l'organe conducteur (21) du bras (18) du rotor.
EP19800303800 1979-11-21 1980-10-27 Montage de bras de rotor pour utilisation dans un distributeur d'un dispositif d'allumage comportant un générateur de signal sans contact pour un système d'allumage électronique Expired EP0030078B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7940207 1979-11-21
GB7940207 1979-11-21

Publications (2)

Publication Number Publication Date
EP0030078A1 EP0030078A1 (fr) 1981-06-10
EP0030078B1 true EP0030078B1 (fr) 1986-01-29

Family

ID=10509330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800303800 Expired EP0030078B1 (fr) 1979-11-21 1980-10-27 Montage de bras de rotor pour utilisation dans un distributeur d'un dispositif d'allumage comportant un générateur de signal sans contact pour un système d'allumage électronique

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EP (1) EP0030078B1 (fr)
DE (1) DE3071397D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3175076D1 (en) * 1980-12-11 1986-09-11 Lucas Ind Plc Rotor vane assembly
US4641627A (en) * 1985-05-03 1987-02-10 Allied Corporation Ignition module

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875920A (en) * 1974-02-04 1975-04-08 Manufacturing Technology Enter Contactless ignition system using hall effect magnetic sensor
DE2716510C3 (de) * 1977-04-14 1981-12-10 Robert Bosch Gmbh, 7000 Stuttgart Tauschsatz für Zündverteiler mit kontaktlos arbeitendem Geber für die Zündung von Brennkraftmaschinen
WO1979000495A1 (fr) * 1978-01-12 1979-08-09 Ford Motor Co Distributeur d'allumage pour moteurs a combustion interne

Also Published As

Publication number Publication date
DE3071397D1 (en) 1986-03-13
EP0030078A1 (fr) 1981-06-10

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