EP0461082A2 - Contact mobile pour système d'allumage par bobine d'un moteur à combustion interne - Google Patents

Contact mobile pour système d'allumage par bobine d'un moteur à combustion interne Download PDF

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Publication number
EP0461082A2
EP0461082A2 EP91830217A EP91830217A EP0461082A2 EP 0461082 A2 EP0461082 A2 EP 0461082A2 EP 91830217 A EP91830217 A EP 91830217A EP 91830217 A EP91830217 A EP 91830217A EP 0461082 A2 EP0461082 A2 EP 0461082A2
Authority
EP
European Patent Office
Prior art keywords
movable contact
construction according
wheel movable
rod
contact
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Withdrawn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
EP91830217A
Other languages
German (de)
English (en)
Other versions
EP0461082A3 (en
Inventor
Luciano Di Sisto
Giovanni Maniglia
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.)
Sincros Md Srl
Original Assignee
Sincros Md Srl
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 Sincros Md Srl filed Critical Sincros Md Srl
Publication of EP0461082A2 publication Critical patent/EP0461082A2/fr
Publication of EP0461082A3 publication Critical patent/EP0461082A3/en
Withdrawn legal-status Critical Current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
    • F02P7/063—Mechanical pick-up devices, circuit-makers or -breakers, e.g. contact-breakers
    • F02P7/0631—Constructional details of contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H01H13/18—Operating parts, e.g. push-button adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift

Definitions

  • the present invention relates to a wheel movable contact for internal combustion engine coil ignition systems.
  • the coil ignition system or assembly is an electric component which is conventionally used on internal combustion engines for producing the high voltage which is necessary for providing the sparks for operating the spark plugs of the engine.
  • a coil ignition system usually comprises a high voltage distributor for the spark-plugs, and a low voltage current switch which power supplies a primary winding of the coil so that, as the electric current through the primary circuit of the coil is abruptely interrupted, a high voltage current is generated by induction in the secondary winding, which generated electric current is supplied to the distributor.
  • the switch or breaker element substantially comprises a breaker arm which is arranged on the body of the ignition coil assembly and which can be difficulty replaced, even if is subjected to a comparatively quick wear.
  • Devices which are specifically designed for generating opening extra-currents by a related movement of a movable contact with respect to a fixed contact.
  • the movement of said movable contact is conveniently counter-biased, by a resilient means, usually comprising a spring which, however, during the calibrating step of the device,can easily disengage from its seat or can be subjected to a deleterious lubricating effect.
  • a resilient means usually comprising a spring which, however, during the calibrating step of the device,can easily disengage from its seat or can be subjected to a deleterious lubricating effect.
  • an insulating film can be formed between the parts provided for mutual contact, which negatively affects a proper operation of the ignition coil system.
  • the aim of the present invention is to overcome the above mentioned drawbacks, by providing a wheel movable contact for internal combustion engine coil ignition systems, which can advantageously replace the conventional breaker arm of the coil system breaker and which, moreover, can be applied on the ignition coil system body in a very quick and simple way.
  • a main object of the present invention is to provide such a movable contact construction which is practically devoid of quick wear phenomena.
  • Another object of the present invention is to provide such a movable contact for coil ignition systems of internal combustion engines which is very reliable and safe in operation.
  • a wheel movable contact for internal combustion engine coil ignition systems characterized in that said movable contact comprises an electrically conductive tubular body, in the inside of which there are arranged a movable contact element electrically connected to said body through biasing resilient means and a flexible bridging element, said movable contact cooperating with a fixed contact which is electrically insulated from said body and is electrically coupled to a plug-in element which can be accessed from the outside of said body, there being moreover provided an actuating element acting on said movable contact which can be driven by a cam element for disengaging said movable contact from said fixed contact.
  • the movable contact construction according to the present invention which has been overally indicated at the reference number 1, comprises a hollow body 2, made of an electrically conductive material which has, preferably, a substantially cylindric shape.
  • the hollow body is closed by a plug element 3 which axially defines a guiding seat 4, for a stem 5 which supports a movable contact element 6.
  • Said movable contact element is turned to and cooperates with a fixed contact element 7 which has a hollow configuration, also preferbaly of cylindric shape, and being housed in that portion of the body 2 which is opposite the portion thereof closed by said plug element.
  • an electrically insulating material cap 8 Between the fixed contact element and the bottom of the body 2, moreover, there is provided an electrically insulating material cap 8.
  • the movable contact element 6, in particular, is resiliently urged against the fixed contact element 7 by a first spring 11, operating between the plug 3 and said movable contact element, said first spring also operating as an electrically connecting element between the movable contact element and hollow body 2.
  • a flexible bridging element 12 which encompasses said first spring, in its axial direction, and which, practically, interconnects the movable contact element and the plug 3 so as to provide a flexible type of connection.
  • an auxiliary spring 13 is furthermore provided, which is arranged about the stem 5 and operates between the central portion of the plug 3 and the end-piece 6a of the movable contact element 6.
  • the aforesaid stem 15, which supports the movable contact element 6, extends through a hole 14 which is coated by an electrically insulating material and is formed along the axis of the fixed contact element 7.
  • the stem projects from the axial end portion of the body 2 where a ring-nut 15 is arranged, provided with an end piece 16 defining an axial hollow 17 therein there is slidably restrained an actuating element, overally indicated at the reference number 18.
  • This coaxial element restrains, by its top edge, an 0-ring 20 adapted to seal the holes from grease, dust and the like.
  • Said actuating or driving element 18 is provided with a rod-like body 21 which is slidably housed in the axial hollow 17, and being counter-biassed by a cup spring 22, operating between a shoulder 23 of the rod body and the bottom of the guide.
  • This cup spring in particular, can be restrained, by its end turns, respectively, in a slot 24 which is circumferentially formed with respect to said rod like body, and against an abutment 25 formed between the ring-nut 15 and related end-piece 16.
  • said rod-like body can not disengage from its axial sliding hollow and, accordingly, fall on the ground or on the working table so that it is always held in a perfect clean condition.
  • the rod-like body contacts the stem 15 so as to cause the latter to be reciprocately driven, thereby electrically disengaging the movable contact element from the fixed contact element, against the biassing of the two coaxial springs 11 and 13.
  • an idle or cam following small roller 26 which engages by contact with a cam element arranged on the shaft of the ignition coil assembly.
  • This roller because of the rotary movement of the cam, causes the rod-like body 21 to reciprocate which in turn causes the movable contact element to quickly disengage from the fixed contact element with a consequent interruption of the low-voltage current, that is that current which circulates through the primary winding of the ignition coil assembly.
  • the calibrating of the spacing between the movable contact element and fixed contact element is carried out at the start of the assembling operations and, accordingly, the hollow body defining the operating contact cartridge is conveniently coated so as to present a continuous tight surface.
  • a diametrical pin 27 which is housed in a slot 28 defined by the end piece 16, in order to prevent the rod-like body from rotating about its pivot axis, so that the roller 26 will always properly engage with the cam mounted on the shaft of the ignition coil assembly.
  • the disclosed wheel movable contact construction, or roller will be applied on the ignition coil assembly casing so as to abruptely interrupt, as the cam element is turned, the contact on the primary winding or circuit thereby providing the desired voltage variation, owing to the conventional magnetic induction effect, through the secondary winding of the coil.

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)
  • Lighters Containing Fuel (AREA)
  • Transplanting Machines (AREA)
  • Tires In General (AREA)
EP19910830217 1990-06-04 1991-05-23 Wheel movable contact for internal combustion engine coil ignition system Withdrawn EP0461082A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2051790 1990-06-04
IT02051790A IT1248935B (it) 1990-06-04 1990-06-04 Struttura di contatto mobile,attuato tramite una rotella, particolarmente studiato per spinterogeni di motori endotermici

Publications (2)

Publication Number Publication Date
EP0461082A2 true EP0461082A2 (fr) 1991-12-11
EP0461082A3 EP0461082A3 (en) 1993-10-20

Family

ID=11168129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910830217 Withdrawn EP0461082A3 (en) 1990-06-04 1991-05-23 Wheel movable contact for internal combustion engine coil ignition system

Country Status (2)

Country Link
EP (1) EP0461082A3 (fr)
IT (1) IT1248935B (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB207075A (en) * 1923-01-15 1923-11-22 George Henry Taylor Improvements in ignition distrubutors
GB892650A (en) * 1959-10-28 1962-03-28 Wilkins & Mitchell Ltd Rotary cam electric limit switches
US3078357A (en) * 1961-07-31 1963-02-19 Kenneth L Frederick Current interrupter for automotive distributors
US3566053A (en) * 1969-05-23 1971-02-23 Gause Dynamics Corp Adaptable repairable and sealed limit switch
US3649785A (en) * 1969-07-30 1972-03-14 Arrow Hart Inc Electrical limit switch
US3987266A (en) * 1973-09-06 1976-10-19 Robert Bosch G.M.B.H. Contamination protected electrical switch, particularly automotive ignition breaker contact structure
EP0115281A1 (fr) * 1983-01-12 1984-08-08 Omron Tateisi Electronics Co. Assemblage d'interrupteur de fin de course

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB207075A (en) * 1923-01-15 1923-11-22 George Henry Taylor Improvements in ignition distrubutors
GB892650A (en) * 1959-10-28 1962-03-28 Wilkins & Mitchell Ltd Rotary cam electric limit switches
US3078357A (en) * 1961-07-31 1963-02-19 Kenneth L Frederick Current interrupter for automotive distributors
US3566053A (en) * 1969-05-23 1971-02-23 Gause Dynamics Corp Adaptable repairable and sealed limit switch
US3649785A (en) * 1969-07-30 1972-03-14 Arrow Hart Inc Electrical limit switch
US3987266A (en) * 1973-09-06 1976-10-19 Robert Bosch G.M.B.H. Contamination protected electrical switch, particularly automotive ignition breaker contact structure
EP0115281A1 (fr) * 1983-01-12 1984-08-08 Omron Tateisi Electronics Co. Assemblage d'interrupteur de fin de course

Also Published As

Publication number Publication date
IT1248935B (it) 1995-02-11
EP0461082A3 (en) 1993-10-20
IT9020517A1 (it) 1991-12-04
IT9020517A0 (fr) 1990-06-04

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