Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
• • 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

Definitions

• the invention relates to an electromagnetic actuator of a starter of a motor vehicle starter, also called starter contactor.
• the invention relates more particularly to a starter contactor for a thermal engine, in particular for a motor vehicle, of the type comprising an annular coil, which surrounds a cylindrical magnetic core mounted to slide axially in a bore of the coil, of the type in which a rear section of the movable core protrudes axially outside the fixed coil, of the type in which an external return spring of the movable magnetic core is axially supported against an external radial flange added from the rear section of the movable magnetic core and the body of the coil , of the type in which the mobile magnetic core has an internal bore which opens at its rear end and which allows the passage of a coupling rod whose rear end is linked to an actuating lever of the starter pinion, which is biased elastically towards the front of the bore by an internal spring mounted axially compressed between a front shoulder surface of the coupling rod and rear shoulder surface of the movable magnetic core, and which is capable of bearing on a bottom before the bore to be driven in translation by the movable magnetic core of the starter
• the magnetic field created by the electrical conductor wound around the body of the coil of a contactor follows field lines which are substantially axial inside the coil and which have the form of loops closing on them. - even outside the coil.
• the mobile magnetic core is generally a piece of soft iron which, whatever its axial position in the bore of the coil, makes it possible to ensure the continuity of passage of the magnetic flux between the carcass and the magnetic core mobile.
• the field lines close on themselves in the immediate vicinity of the coil, which increases the efficiency of one electromagnet and reduces the electrical power consumed by it.
• the movable magnetic core is produced by turning as it has complex shapes such as a rear shoulder surface of the bore of the movable magnetic core, which is internal and forms a support for the internal spring of the coupling rod, or such as a front surface, arranged at the bottom of the bore of the movable magnetic core, and intended to receive a front plate closing the bore of the movable magnetic core after assembly of the components in one bore.
• the invention proposes a mobile magnetic core comprising a rear shoulder surface of the bore. of the simplified movable magnetic core, and a simplified closure of the bottom of the bore.
• the invention provides a starter contactor for a thermal engine, in particular for a motor vehicle, of the type comprising an annular coil, which surrounds a cylindrical magnetic core mounted to slide axially in a bore of the coil, of the type in which a section rear of the movable magnetic core protrudes axially outside the fixed coil, of the type in which an external return spring of the mobile magnetic core is in axial abutment against an external radial flange added from the rear section of the mobile magnetic core, of the type in which the mobile magnetic core has an internal bore which opens out at the rear end which is arranged in front of the flange and which allows the passage of a coupling rod, the rear end of which is linked to an actuating lever of the starter pinion, which is resiliently biased towards the front of the bore by an internal spring mounted axially compressed against a front shoulder surface of the coupling rod and a rear shoulder surface of the movable magnetic core, the front end of which is capable of bearing on a front bottom of the bore so as to be
• the external flange is arranged at the rear end of the cup, and the shoulder surface of the bore of the movable magnetic core constitutes a front bottom of the cup, pierced for passage of the coupling rod, and which abuts axially forwards against the rear end face of the core body;
• the outside diameter of the body of the cup is substantially equal to the diameter of the body of the mobile magnetic core, so that the cup extends axially towards the rear of the body of the mobile magnetic core;
• the front bottom of the cup is welded to the rear end of the body of the mobile magnetic core;
• the cup has at least two arms which extend axially forwards beyond the front bottom of the cup and facing the periphery of the mobile magnetic core;
• the arms have at their front ends elbows which are folded radially towards the axis of the movable magnetic core; the arms are cut in the front bottom of the cup, and are folded at right angles;
• the cup is crimped onto the mobile magnetic core by an axial crushing of the material of the rear end of the body of the mobile magnetic core, which forms a peripheral bead arranged axially between the rear end of the body of the mobile magnetic core and the elbows of the arms, so as to immobilize the arms axially;
• the cup is crimped on the movable magnetic core by an axial crushing of the material of the periphery of the movable magnetic core, which causes, radially and outward, a reflux of material in holes which are arranged opposite in the arms;
• FIG. 1 is an axial sectional view of a starter comprising a contactor according to the prior art
• FIG. 2 is an axial sectional view of a movable magnetic core on which is welded a cup according to a first embodiment of the invention
• Figure 3 is an axial sectional view of a movable magnetic core on which is crimped a cup according to a second embodiment of the invention
• Figure 4 is a view according to Figure 3 showing, in a rear axial view, a cup according to the second embodiment of the invention
• FIG. 5 is an axial sectional view of the cup of Figure 4.
• FIG. 6 is an axial sectional view of a movable magnetic core on which is fitted a cup according to a third embodiment of the invention.
• Figure 7 is a sectional view along line 7-7 of Figure 9 of a movable magnetic core on which is crimped a cup according to a fourth embodiment of the invention
• Figure 8 is a detail F8 of Figure 7 showing the attachment of the cup arms on the movable magnetic core
• FIG. 9 is a view along line 9-9 of Figure 10 showing in a rear axial view of the cup shown in Figure 7;
• FIG. 10 is a view in axial section, on the line 10-10 of FIG. 9, of the cup shown in FIG. 7.
• FIG. 1 shows a starter 10 intended to equip a combustion engine of a motor vehicle (not shown).
• the starter 10 essentially consists of a casing 12 inside which a starter pinion 14 is arranged which is slidably mounted on one end of a shaft 16. The shaft 16 is rotated by an electric motor 18 of starter 10.
• the sliding movements of the starter pinion 14 are caused by a lever or fork 20 which pivots inside the casing 12 around a horizontal geometric axis X-X.
• the lower free end 22 of the control lever 20 acts on a drive 24 of the starter pinion 14 while its upper free end 25 is connected to a coupling rod 26 belonging to an electromagnetic contactor 30, which is arranged at the part starter upper 10.
• the contactor 30 comprises a movable magnetic core 32 whose movements are controlled by a coil 34 along a horizontal axis YY perpendicular to the axis XX of pivoting of the lever 20.
• the movable magnetic core 32 is a general part of hollow annular cylindrical shape which is guided in sliding by its external cylindrical surface and of which the internal bore 36 receives the coupling rod 26 and a helical compression spring 38.
• the rear end 40 of the spring 38 bears against a rear shoulder surface 42 of the bore 36 of the movable magnetic core 32, and the front end 44 of the spring 38 bears against a front shoulder surface of the rod coupling 26, which is carried by a head 46 arranged at the free front end of the coupling rod 26.
• the coupling rod 26 is capable of bearing, by means of its head 46, on a front bottom 48 consisting of a plate-shaped bore closing disc 36, which is crimped in a cylindrical housing 50 of the movable magnetic core 32, the coupling rod 26 being capable of being driven in translation along the axis YY and towards the rear by the movable magnetic core 32 during actuation or release of 1 electromagnet which is composed of the mobile magnetic core 32 and the coil 34.
• the annular rear shoulder surface 42 is made integrally with the body of the movable magnetic core 32, and the rear end 52 of the movable magnetic core 32, which projects axially rearward.
• outside the fixed coil 34 has an attached cup 54, which is crimped on the rear end 52 of the movable magnetic core 32, and which has at its periphery a flange 56, which extends radially outwards, and which is intended to serve as a support for an external spring 58 for returning the movable magnetic core 32 to its rear rest position illustrated in FIG. 1.
• the spring 58 resiliently returns the movable magnetic core 32 backwards by taking support between the collar 56 and the casing 31 of the contactor 30.
• FIG. 2 illustrates a first embodiment of the invention in which a new attached cup 54 is arranged at the rear end 52 of the mobile magnetic core 32.
• the mobile magnetic core 32 differs significantly from the mobile magnetic core previously described with reference to Figure 1, to the extent that the bore 36 of the movable core 32 opens at the rear of the mobile magnetic core 32 and is blind at the front.
• the front bottom 48 of the bore 36 is no longer, as previously described with reference to the state of the art, constituted by an attached disc but it is made integrally with the body of the mobile magnetic core 32.
• the tubular body of the attached cup 54 is externally of a diameter substantially equal to the diameter of the mobile magnetic core 32 and it comprises at its rear end the flange 56 previously described with reference to FIG. 1.
• the bore 36 no longer has an internal rear annular face as previously described with reference to FIG. 1, but it opens into the annular rear free end face 52 of the core 32.
• the rear radial shoulder of the bore 36 of the movable magnetic core 32 is constituted by a bottom 62 of the cup 54, including a central hole 60, of diameter greater than the diameter of the coupling rod 26, allows axial deflections and vertical of the coupling rod 26 when the rear end of the latter moves with the end 25 of the actuating lever 20.
• the central part of the bottom 62 of the cup 54 which extends radially inwards opposite the bore 36 forms the rear annular shoulder surface 42 which allows the support of the internal spring 38 for returning the rod d 'coupling
• the cup 54 therefore alone comprises the two surfaces 56 and 42 for supporting the external springs 58 for returning the movable magnetic core 32, and the internal 38 for returning the coupling rod 26.
• the cup 54 is welded at the periphery of its bottom 62 at the periphery of the rear end 52 of the mobile magnetic core 32.
• FIG. 3 illustrates a second embodiment in which the cup 54 is crimped at the rear end 52 of the mobile magnetic core 32.
• the cup 54 has a shape generally similar to that described with reference to FIG. 2.
• the tubular body of the cup 54 has a diameter slightly greater than the outside diameter of the mobile magnetic core 32 and it preferably comprises three arms 64, angularly distributed at regular intervals, which extend axially forwards so as to be adjacent the periphery of the movable magnetic core 32.
• the arms 64 have at their front ends elbows 68 which have the function of centering the cup 54 on the body of the movable core 32.
• the cup 54 can, for example, be produced by stamping.
• the cup 54 can, at the time of its manufacture, be formed from a cup 54 similar to that described with reference to FIG. 2, in the bottom 62 from which are punched out three flat radial tabs which are subsequently folded perpendicularly and in the axial direction YY at the bottom 62 to form the arms 64 which extend axially forward.
• the cup 54 is threaded onto the rear end 52 of the mobile magnetic core 32 until the bottom 62 of the cup 64 is axially in abutment against the rear end 52 of the mobile magnetic core 32
• the rear end 52 of the mobile magnetic core 32 constitutes an axial stop towards the front for the cup 54.
• the cup 54 is simultaneously held externally so as not to be able to deform radially outward.
• a crimping tool then penetrates axially along the YY axis inside the cup 54 into the spaces left free by the cutting of the arms 64, which can more particularly be seen in FIG. 4, and crushes the end 52 of the movable magnetic core, forming axially opposite the arms 64 of the cup 54 a bead 66 of material of the mobile magnetic core 32, which allows the axial immobilization towards the rear of the arms 64 of the cup 54 relative to the mobile magnetic core 32.
• the cup 54 is moreover immobilized axially towards the front by means of its bottom 62 resting on the rear end 52 of the mobile magnetic core 32, it is rigidly linked to the mobile magnetic core 32.
• FIG. 6 illustrates a third embodiment in which the cup 54 is not crimped but fitted by force onto the rear end 52 of the movable magnetic core 32.
• the cup 54 is substantially similar to the cup 54 described with reference to the Figure 3, and it is provided with three arms 64 angularly distributed at regular intervals which extend axially forwardly in contact with the periphery of the movable magnetic core 32.
• the arms 64 have at their front end bends 68 which are folded down radially towards the axis YY of the mobile magnetic core 32 and which are, in this embodiment, capable of being received in an external radial groove 70 produced at the periphery of the mobile magnetic core 32.
• the cup 54 is threaded axially on the mobile magnetic core 32 while temporarily deforming towards the outside the arms 64, then the elbows 68 of the arms 64 of the cup 54 penetrate into the groove 70 of the movable magnetic core 32 thus ensuring its axial immobilization, the bottom 62 of the cup 54 coming into contact with the rear end 52 of the core mobile magnetic 32 for perfecting the axial immobilization of the cup 54 and determining a precise axial position of the cup 54 relative to the core 32.
• FIGS. 7 to 10 illustrate a fourth embodiment in which the cup comprises two diametrically opposite axial arms which are fixed to the mobile magnetic core 32.
• the cup 54 comprises two arms 64, which extend axially towards the front and which have substantially the shape of an arc of a circle in a transverse plane perpendicular to the YY axis.
• the arms 64 each have two holes 71 located in this same transverse plane, and which are intended to cooperate with the body of the movable magnetic core 32 during crimping to immobilize the cup 54 relative to the movable magnetic core 32.
• the cup 54 can for example be produced by stamping, or by punching and folding, the arms 64 being cut beforehand in the bottom 62 of the cup 54, then folded perpendicularly to the latter so that once the cup 54 in position on the mobile magnetic core 32, these extend axially towards the front by following the periphery of the mobile magnetic core 32.
• the cup 54 When assembling the cup 54 on the mobile magnetic core 32, the cup 54 is threaded axially on the mobile magnetic core 32 until its bottom 62 abuts on the rear end 52 of the mobile magnetic core 32 .
• the cup 54 is retained on its outer periphery by an appropriate template to prevent it from being deformed during the crimping operation. Then a crimping tool penetrates inside the concavity of the cup 54 into the interstices left free by the cutting of the arms 64 and crushes the rear end 52 of the mobile magnetic core 32 so that the material of the mobile magnetic core 32 is driven radially outwards and enters the holes 71 of the cup 54, immobilizing it axially towards the rear, as shown in the detail view of FIG. 8.
• the various mobile magnetic contactor cores 30 thus produced make it possible to significantly reduce production costs.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electromagnets (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9530164

Family Applications (1)

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• 1998
  • 1998-09-03 FR FR9811122A patent/FR2783090B1/fr not_active Expired - Lifetime
• 1999
  • 1999-09-03 US US09/530,428 patent/US6307454B1/en not_active Expired - Lifetime
  • 1999-09-03 KR KR1020007004685A patent/KR100622206B1/ko active IP Right Grant
  • 1999-09-03 JP JP2000569416A patent/JP4376462B2/ja not_active Expired - Lifetime
  • 1999-09-03 DE DE69928072T patent/DE69928072T2/de not_active Expired - Lifetime
  • 1999-09-03 WO PCT/FR1999/002101 patent/WO2000014759A1/fr active IP Right Grant
  • 1999-09-03 ES ES99941684T patent/ES2249912T3/es not_active Expired - Lifetime
  • 1999-09-03 BR BRPI9906986-5A patent/BR9906986B1/pt not_active IP Right Cessation
  • 1999-09-03 EP EP99941684A patent/EP1029335B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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