EP0484291B1 - Un dispositif électromagnétique pour commander l'alimentation de courant d'un moteur de démarrage d'un engin à combustion interne de véhicule à moteur - Google Patents

Un dispositif électromagnétique pour commander l'alimentation de courant d'un moteur de démarrage d'un engin à combustion interne de véhicule à moteur Download PDF

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Publication number
EP0484291B1
EP0484291B1 EP91830460A EP91830460A EP0484291B1 EP 0484291 B1 EP0484291 B1 EP 0484291B1 EP 91830460 A EP91830460 A EP 91830460A EP 91830460 A EP91830460 A EP 91830460A EP 0484291 B1 EP0484291 B1 EP 0484291B1
Authority
EP
European Patent Office
Prior art keywords
controlling
fixed contacts
combustion engine
internal combustion
weight
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 - Lifetime
Application number
EP91830460A
Other languages
German (de)
English (en)
Other versions
EP0484291A1 (fr
Inventor
Bruno Ugo
Luciano Buschi
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.)
Industrie Magneti Marelli SRL
Original Assignee
Industrie Magneti Marelli SRL
Magneti Marelli SpA
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 Industrie Magneti Marelli SRL, Magneti Marelli SpA filed Critical Industrie Magneti Marelli SRL
Publication of EP0484291A1 publication Critical patent/EP0484291A1/fr
Application granted granted Critical
Publication of EP0484291B1 publication Critical patent/EP0484291B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H01H51/065—Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/025—Composite material having copper as the basic material

Definitions

  • the present invention relates to an electromagnetic device for controlling the current supply to the electric starter motor of an internal combustion engine for motor vehicles comprising an electromagnet including a solenoid for controlling a movable contact which is adapted to cooperate with a pair of fixed contacts carried by a support of electrically-insulating material, each fixed contact comprising a screw-like, threaded metal member clamped to the support with a predetermined force by a respective nut.
  • An electromagnetic device of the type specified in the preamble of claim 1 is known from PCT patent application WO-A-87/02824, where the material of the fixed contacts is not specified.
  • the fixed contacts In applications in which the fixed contacts have to be clamped to the insulating support with a fairly high clamping torque (for example, 15 Nm or more) the fixed contacts typically have a two-component structure; a steel screw suitable for withstanding the clamping torques envisaged has a recess in its head, in which a pellet of electrolytic copper is fixed for cooperating with the movable contact of the electromagnet.
  • the copper pellet may be fixed to the head of the steel screw by braze-welding or clamped thereto mechanically, for example by upsetting.
  • European patent application EP-A-0 172 912 relates to a vacuum breaker having a fixed contact and a movable contact, each constituted by an alloy pellet soldered to a respective end of a conducting rods and in which the material used for the pellets is a copper-based alloy including chromium, approximately 25% by weight, and zirconium, up to 5% by weight.
  • the results of tests using different quantities of chromium and zirconium are reported and an insufficient weld-resisting ability and breakdown voltage was found for material using 0.3 % by weight of zirconium and less than 20% by weight of chromium.
  • the material used for the contacts is different from the material used for the conductors and it causes problems of cost as in the case mentioned above.
  • the object of the present invention is to provide an electromagnetic device of the type specified above, whose fixed contacts overcome the problems explained above.
  • this object is achieved by means of a device of the type specified above whose main characteristic lies in the fact that the threaded members constituting the fixed contacts are made of copper-based alloy including chromium and zirconium, said alloy comprising:
  • the fixed contacts may be formed either by machining, that is, by turning, or by die-forming.
  • Figure 1 shows a device embodying the invention, generally indicated 1. It includes, in known manner, a support element 2 of electrically-insulating material which, in the embodiment illustrated, is substantially cup-shaped.
  • An electromagnet generally indicated 3, is fixed to this element.
  • the electromagnet includes a casing containing a spool 5 carrying a control winding or solenoid 6.
  • a movable core, generally indicated 7 is associated with the solenoid.
  • the movable core has a head 7a which extends into the cavity in the support element 2 and carries a plate 8 of electrically-conductive material, preferably copper, which constitutes the movable contact.
  • the end wall of the support element 2 has two holes 9 through which the shanks of two screws 10 extend.
  • the screws have hexagonal heads 10a which, in the assembled condition, face a side portion of the plate 8 constituting the movable contact.
  • the screws 10 are clamped to the support 2 by respective nuts 11, with the interposition of washers 12.
  • the screws 10 are formed in one piece from a copper-based alloy including small quantities of chromium and zirconium.
  • the alloy includes:
  • such an alloy is the alloy No. 2.12.33 conforming to DIN standard 17666.
  • the screws 10 may be formed either by machining (turning) or by die-forming.
  • the fixed contacts thus produced have very good electrical conductivity, better than that of the prior-art contacts made of copper and steel, and can whithstand the highest clamping torques currently envisaged.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Electromagnets (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Control Of Eletrric Generators (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Contacts (AREA)

Claims (3)

  1. Un dispositif électromagnétique pour commander l'alimentation de courant d'un moteur de démarrage d'un engin à combustion interne de véhicule à moteur, composé d'un électro-aimant (3) incluant un solénoïde (6) de commande d'un contact mobile (8), apte à coopérer avec une paire de contacts fixes (10 et 10a), portés par un support (2) en matériau isolant sur le plan électrique, chaque contact fixe comportant un élément métallique fileté en forme d'hélice (10), fixé au support (2) selon une force prédéterminée, au moyen, chaque fois, d'un écrou (11) respectif, caractérisé en ce que les éléments filetés (10) constitutifs des contacts fixes sont en alliage de chrome et de zirconium comprenant:
    - entre 98,5 et 99,67% de poids de cuivre (de préférence 99,1%),
    - entre 0,3 et 1,2% de poids de chrome (de préférence 0,8%), et
    - entre 0,03 et 0,3% de poids de zirconium (de préférence autour de 0,1%).
  2. Un dispositif selon revendication 1, caractérisé en ce que les contacts fixes sont obtenus par usinage.
  3. Un dispositif selon revendication 1, caractérisé en ce que les contacts fixes sont obtenus par matriçage.
EP91830460A 1990-10-31 1991-10-29 Un dispositif électromagnétique pour commander l'alimentation de courant d'un moteur de démarrage d'un engin à combustion interne de véhicule à moteur Expired - Lifetime EP0484291B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6785490 1990-10-31
IT67854A IT1241000B (it) 1990-10-31 1990-10-31 Dispositivo elettromagnetico di controllo dell'alimentazione di corrente al motore elettrico di avviamento di un motore a combustione interna per autoveicoli.

Publications (2)

Publication Number Publication Date
EP0484291A1 EP0484291A1 (fr) 1992-05-06
EP0484291B1 true EP0484291B1 (fr) 1995-12-27

Family

ID=11305809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91830460A Expired - Lifetime EP0484291B1 (fr) 1990-10-31 1991-10-29 Un dispositif électromagnétique pour commander l'alimentation de courant d'un moteur de démarrage d'un engin à combustion interne de véhicule à moteur

Country Status (4)

Country Link
EP (1) EP0484291B1 (fr)
DE (1) DE69115857T2 (fr)
ES (1) ES2084143T3 (fr)
IT (1) IT1241000B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2697370B1 (fr) * 1992-10-26 1994-12-02 Valeo Equip Electr Moteur Contacteur pour démarreur de moteur à combustion interne de véhicules automobiles.
US8278600B2 (en) * 2007-11-28 2012-10-02 Lincoln Global, Inc. Welding contractor apparatus with improved heat dissipation
DE102008002432A1 (de) * 2008-06-16 2009-12-17 Robert Bosch Gmbh Relaiskontaktstück, elektromagnetischer Schalter für eine elektrische Maschine und Herstellungsverfahren

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60172116A (ja) * 1984-02-16 1985-09-05 三菱電機株式会社 真空しや断器用接点
US4692192A (en) * 1984-10-30 1987-09-08 Ngk Insulators, Ltd. Electroconductive spring material
FR2581658B1 (fr) * 1985-05-10 1987-07-17 Centre Nat Rech Scient Nouveaux alliages dotes de performances electriques et mecaniques elevees, leur fabrication et leurs applications en particulier dans les domaines electrique, electronique et connectique
DE3537598A1 (de) * 1985-10-23 1987-05-27 Bosch Gmbh Robert Elektromagnetischer schalter, insbesondere fuer andrehvorrichtungen von brennkraftmaschinen

Also Published As

Publication number Publication date
EP0484291A1 (fr) 1992-05-06
IT1241000B (it) 1993-12-27
DE69115857D1 (de) 1996-02-08
DE69115857T2 (de) 1996-06-13
ES2084143T3 (es) 1996-05-01
IT9067854A1 (it) 1992-05-01
IT9067854A0 (it) 1990-10-31

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