DE1879009U - IGNITION DEVICE FOR COMBUSTION MACHINERY. - Google Patents

Description

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RP 'Β E RT BO S C H

Ignite lnrlohtung_. For "Bjggnnkgaftmasqhlnen

The invention relates to an ignition device for internal combustion engines , in particular for vehicles, in which the primary winding of a high-voltage ignition coil is supplied with current from a direct current source, which is blocked at the moment of ignition by a transistor connected in series with the primary winding *, whose. control electrode © is connected to a «permanent magnetic» lit. of the internal combustion power · = - ■ machine-coupled electrical generator »

.With such ignition devices it must be ensured * that

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-ν 'iV' '...- "' ' * - ... 7β02 Lr / Lm
9c 5ο Μ No. ₀

Robert B'psch GsibH ■

Stuttgart -

During the pauses between two ignition processes, the magnetic field - .. builds up as completely as possible in the .iron parts of the ignition coil, so that when the primary current is interrupted, single * powerful ignition sparks can arise, especially at high speeds. Field is only available for a short period of time, therefore it is necessary * that the generator used to control the transistor supplies an output voltage which the transistor covers during the major part of the two basic gears,., .- crankshaft rotation angle in its current conducting state and leaves '''and the transistor is blocked only for a much smaller part of this. rotational angle for generating the ignition spark "'.

This task is achieved with an ignition device of the type described at the beginning, in which, according to the invention, the base of the transistor is connected to two above the operating current source. series-connected resistors comprising voltage divider connected and sswisehen the base and the connection point of the two resistors, a third resistor is arranged, to which the series circuit of a rectifier impermeable to the base current of the transistor and a winding of a _; p @ rmanentmag ° netisehenj, with the internal combustion engine coupled pulse generator, the magnet system is designed _p 'that' the induced in the winding, via the rectifier sin the. Base, the transistor arriving and blocking this pulse "a pulse duration of at most a quarter of the pulse train side."'Honeycombs «· · ■. - ■ ...-. . "■

It has proven to be particularly useful if the electrical generator has a revolving magnet system and a fixed winding, the sug @ h8rig @ n pole shoes of which extend, each over a large angle of rotation, and each other through narrow, hur Pole gaps that extend over a small angle of rotation are separated : while the magnet is running, the end faces facing the pole pieces are approximately the same width as the poles

Robert Bosch GmbH Lr / Lm R _o <~ Nro76O2

Stuttgart · 9.5 »19β1

Further details of the invention are set out below with reference to FIG Embodiments described and shown in more detail "

Figo 1 shows an electrical ignition device in its switch »

picture,: V. .. "■ - ■■■ '·.

FIG. 2 shows a permanent magnetic control generator for use in the ignition device according to FIG.

Figo 2 in cross section and - · ■■.

Figo 4. a single part of the rotating armature of the control -. , .. ·. · /. generator of Figure 2 and _o '' ·

Fi & _o 5 a single part of the associated stand each, in

spatial representation «, · Figo β shows a diagram to explain the mode of operation of the generator and the ignition systems Xn

/ Figo 7 is the magnetic runner of one. other control generator ■ im.qunitte and in · ·, Figo 8 partly in the view and partly in section .. ""'represents. ■. '■ - \ \:'

FIG _e 9 shows as a further embodiment of a

V other magnetic rotor of a control generator Im 'Cross section and'. ;

Pigi'10, in elevation and partly in longitudinal section

The ignition device contains a high-voltage ignition coil with a primary winding 10, which sits together with a secondary winding on a common iron core II in series with the primary winding 10, the emitter / collector path of a transistor ij 'are connected, the leading with its emitter connected to a to .One nicliit · "-dargestellten collector battery lead 14 is ·»' .schlossen is't _0th the other end of the primary winding 10 is connected via

Robert Bosch GmbH Lr / Lm R, - No. ' 7602

Stuttgart ■ '■ ... ■'. ■■ 90501961 '

a limiting resistor 16 and a negative lead 15 to the Negative pole of the battery in connection «The secondary winding 12 is also connected to the negative line with one of its two winding ends 15 connected. A high-voltage cable 1? to the rotating distributor electrode 18 of an overshoot distributor 19 “Each has four fixed distributors electrodes 20 is via © in ignition cable 21 with one of the four Spark plugs connected to the internal combustion engine, of which the clarity, because only one spark plug is indicated at 22 in the drawing ".-- .. · '

The transistor 15 is switched in such a way that in the idle state it can conduct a high magnetization current through the primary winding 10, which is interrupted at the desired ignition moments to generate the ignition sparks. In order to keep the transistor 13 conductive in the idle state, a voltage divider consisting of a resistor 25 of about 2 ohms and a resistor 26 of about 15 ohms is provided between the positive line 14 and the negative line 15. The base of the transistor IjJ is connected to the connection point of the two resistors via a resistor 27 of approximately 5 ohms

In order to be able to block the transistor in the desired ignition moments, a permanent magnetic control generator JO is provided, which has two windings 31 and 32 The direct current © coming from the battery can "This prevents " the impulses ©, which are used to block the transistor and supplied by the control generator 30, from being influenced by the battery. at the connection point of the resistors 25 * ¹ 26 and 27 -. closed, your winding ends are free. to the supply line

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Robert B03ch OmbH ': Lr / Lm R ₀ -No. 7602

Stuttgart 9 · 5 · 19β1

electrode / two rectifier 34 and out .35 whose Ablei "= · ■ 'turigseXektroden with DER base of the transistor 13 and the resistors, are stood .verbunden 27 = As long as transistor 13 iet to conduct current, the rectifier 34 and 35 in The transistor is blocked in each case when voltages are induced in the windings 31 and 32 in the manner described in more detail below, which make their winding ends connected to the rectifiers 34 and 35 positive compared to the connecting line 33 . A control current J- fHessen can then namely via one of the two rectifiers and the resistor 27, which makes the potential of the base of the transistor 13 positive compared to the positive line 14 and therefore blocks the transistor. The magnetizing current, which is effective in the iron core 11 of the ignition coil, has since been built up by the magnetizing current flowing through the emitter-collector path of the transistor, the primary winding 10 and the limiting resistor 16 Secondary winding a Zündspannurigsstoss, which over the revolving distributor electrode one -der

■■ "The spark plug feeds becomes ₀ · ■

Figo 2 shows a preferred embodiment for the control generator which has a very small footprint because it is with the in Figo 1 is combined into an easily exchangeable unit at 19. indicated distributor, '...

This structural unit contains, in a housing 40 cast from light metal, a hollow shaft 41 which can be coupled to the camshaft of the internal combustion engine and revolves at half the crankshaft speed. .42 for the control generator and the dividing finger 43 carrying the rotating distribution electrode 18. The self-adjuster, constructed in the usual way, contains a support plate 45 "This is ^{riveted to the end section of the hollow shaft 1} M protruding into the housing 4p and carries two parallel" ur armature shaft 42, he "

Robert; Bosch GmbH '', Lr / Lm Rc no. 7602

Stuttgart '9 _β 5 · 196ΐ

Extending Studs. 46 and 47 ·. In each of the © studs, there is a © in © of two. Coil spring * 48 and. 49 attached, each of which engages with one of two flyweights 50 and 5.1 coupled to the armature shaft 42 with their other end the armature shaft 42 in the direction of rotation and the hollow shaft 4l stronger, the faster the internal combustion engine runs. . ^; ■

In essence, the control generator 30 contains a permanent magnet 54 attached to the armature shaft 42 with a flessing sleeve 53, which is polarized in the axial direction so that, for example, its upper end has a north pole N and its lower end ^: on the other hand a south pole S. shows on the upper face of the permanent "raagneten is serving as a soft iron pole bracket .55 sets listed, der.in Q:.? i§ 4 more visible ₀ His © two is abgewin" end sections 56 and 57 carry on their-colds. outer shell side each has a radially projecting nose 58 and 59 running in the axial direction, while the leg ends 56 and 57 of the upper pole bracket 55 extend downwards towards the adjuster, is on the lower end face of the permanent magnet, which forms the south pole 54 a second pole bow & Q designed in the same way. which is offset by 90 ° compared to the upper pole bracket 55. Its false celestial 62, shown in section in FIG. 3, extend towards the distributor finger 4j $ and also have two axially sparse = allele noses 63 and 64 "" .

The stationary stator of the control generator, which is pressed into the housing 40, is formed by two coaxially angled soft iron rings 65 and 6.6. Of these deic lower, designated 66 ring näher'dargestellt in Figo 5; ,, The ring 66 has two extending perpendicularly to the armature shaft 42 · 67 bars, the free end portions 68 and 69 inwardly

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· :. Robert-Bosch GmbH '... Lr / Lm R .-- No. ₀ '. 76oS

.- ■ · ,. Stuttgart '. · ■■ · ■' '· 9 »5ο1 · 96ΐ ■., ■' ■ '.

pulled "and so-designed, are" that they each extend over about 85 ° in the UBiangrichtung of the anchor. Form pole shoes that face the circumferential lugs 58 * 59, 63 and 64 of the armature with a small '.. ■ distance. The upper ring 65 is placed on the lower ring 66 in such a way that its pole pieces 72 and 75, which are seated on the webs 70 and 71, are arranged in a conical manner to the pole pieces 68 and 69 of the lower ring, but opposite to those of the lower ring. Pole pieces belonging to the ring each free pole gaps ». blank, the width of ψ in the circumferential direction of the armature measured about 5 ° beträgt0 The two indicated in Figure "1 at 31 and 32 winding halves of the control generator be in the of the rings 65 and 66 are enclosed space between this and the pole pieces 68, 69, 72 and 73 «'"'

In the position of the armature shown in Figo 2 opposite. At the stator, the flux β emanating from the cord pole of the magnet 54 first passes through the upper pole bracket 55 and from there is evenly distributed between the two bracket ends 56 and 57; ". on the opposite pole piece 72 and the web 70 to the ring 65" From there it is forwarded to the lower ring 66 via "the end faces of the Ring®, which lie on top of one another with practically no air gap, and can be distributed here to the two pole pieces 68 and from from which it '· returned »,' ■ · 'via the air gap and the nose 63 and 64 of the lower pole bracket to the south pole of the permanent magnet 5-4.

If the armature continues to rotate clockwise, the nose 58 connected to the north pole N faces the pole piece 68 on the lower ring 66, while the nose 63 connected to the south pole S * faces the pole piece 72 of the upper ring 65 on the routes 31 and 32 the river then has a direction opposite to that of the previously flat path c ^.... ^: ,. ■

Robert Bosoh GmbH '"Lr / Lm R.-No

Stuttgart '. 9 «56

The pole gaps lying between two pole pieces 68, 73 or 75, 69 that follow one another in the direction of rotation are selected together with the width of the cheeses 58, 59, 63 , 64 on the pole pieces in their width measured in the direction of rotation so that During operation of the internal combustion engine, the approximately trapezoidal course of the "magnetic flux j9" penetrating the windings 51 and 52, shown in FIG. This flow remains practically at «Sero the same value as long as the noses are opposite the · 'pole pieces. are located. If, however, the noses run past the po ll gaps. the effective flux decreases and reaches its negative, then constant value as soon as the noses * face the next pair of pole shoes as the armature continues to turn, as a result of the trapezoidal course of the magnetic. Flux is induced in each flow change from the positive value to the negative value in the winding 51 a positive voltage pulse U ₁ and simultaneously in the winding 52, a negative "voltage pulse Vg ,,.. When ^'1 next, after a rotation of the armature about t / 2 »90 ° occurring flux change from the negative to the positive value is induced in the winding 51 a negative voltage impulse, which is not described in detail, and in the winding 52 a positive voltage impulse, indicated in FIG. . .

Each of the positive voltage pulses U ₁ ,, U, generates a reverse current j, shown in FIG can come into effect «,

The particular advantage of the very short voltage surges lies in the fact that, even at very high drive speeds, the period between two blocking pulses is sufficiently large that the electromagnetic field in the iron core 11. Ignition coil can build up to its full value »· Auf.diese Weis © ensures that even at very high speeds during each Zü'üuvorgangs sufficient ignition energy is provided in the secondary coil _v '12 '

9 '

Robert.'tüoach QnäbH '"Lr / Lm Ro = Nr ₀ ? 6öS

Stuttgart ", -. '9.5 ° 196V

In the in Figure 7 and 8 ₀ dargestellten'zweiten AusführungsbeispieX for Steuergsnerator is a magnetic rotor ¹ 'is used, which likewise' if two - having pole pairs "Each of the four pole pieces 8l is sswisehen two of the four permanent magnets ringsektörförmigen

■ Ö2o The permanent magnets are polarized in the circumferential direction and λ are in pairs. same poles, at one of the KSL pieces. _o at their radial outside to the above-end sides an.denen which are from, the magnet provided on magnetic flux-a stand which can dargestellten'Art.übertreten in Figs. 2 _e 3 and 5 x

'■ in'., Ufangsriöhtung measured as narrow as the sswischen the pole « _: ■: ■ · ■ 'shoes remaining pole gaps and extend approximately" over © r 8 ⁰ - "The · pole pieces 8l and di @ permanent magnet © 82 held in place by a jacket 83 injection-molded from plastic, which forms a strong-walled hub 84 with which the magnets are isolated from the shaft 42 which can be made from steel So that the pole pieces 81 are held securely in the jacket 83 even at high drive speeds of the power generator, their back facing the shaft a slightly wedge-shaped cross-section recognizable in Fig. 7 .have »

in contrast to the second embodiment, it is in the case of the magnetic rotor of the third embodiment according to FIGS. 9 and 10 in one piece ger permanent magnet '90 ', which is roughly star-shaped (cross-section .. ■ hato on its radially projecting arms 91 are made of soft iron «

; '.- Uechen assembled with axially parallel brass rivets · 9i2. . put together pole pieces 93, which are similar to. the.

-. Pole shoes' 55 carry narrow attached noses 94 »The noses extend in the circumferential direction over about 8 to 10 ° and are - like this ^: wide as ■

^(The pole gaps of the associated, not shown stand "For the Zusaffimenhalfc the Ροίstücke 93 ^ and their safe investment with ^l the PoIflachen the magnet arms 9.I sorgen.zwei -. Messingsoheibeh 95" and 96.0 in these brass rivets are versteramt 92 so that the magnet = · '»: ■ ^ buyers as a whole on © in®, not shown, made of non' raagiie · =. ■.,. ','t'isable'material

Claims (1)

'fipbert Boacii GnteH ■ · ■' ■ Xir / fa ■ E »Ir .. 7602 wirä supplies for ^ eaaferoftmaecliia® '''? © »yafers5 $ uge & ₉ at ai © Briiasrwio & LIMG elixir Be ^ ^ eptffijnu ftltautopuXe off with power of _9? in 2Öad ~ © iaeii sdt <t" r frliaärwloielttag in E0SJ1 © · deeds franeietor locked; wirfi * äatmrob gektimseialiiMiti * doae di © Basis des fransistor © an oiaem over 4 «r iJLeg ^ Näeja, js« r «i b.iateT'öiiiaiieleir 'geschclt · 3pani« Higst © ± l © r ange-sohlossen- and awi0o5i © 3a of the base muzzle point; of the two is assigned fixeret &ade'ein third WidayetanÄ .ang # · * 'aa t ^ m B © Iji © asofesltumg "aa" in "*" -iöar the atrom A ^"b: Prenaietore waäurolil.äsjsiigön öltieiirioiittr" nd Wio & liajig elaes pdranaaentraagnetieolien »ialt äor Brennkraftmas.ciJailie ■ · coupled stoeoeeaeratere paralleleveohaXtet'iet». where ^ ei_ there ©. Magnetsyeten; βό ■ is developed, that'die In der fiolslung '_,''· ; über © r §θϊι ßleieiiriolitör to the base of the 0? ra, asliitor ©; - vm. & this blocking Impmlß © © ine Ifcptälföäa »© r-ren \. ■ ■ eiaeii quarter of the impulse following babcn« "; · 2ündeinrieht «| ng nach insprueli '1 * ■ thereby geicemigieietoet ,, / Vdasa / ..'; -the Q & n & r & toT #ia iaalaufendes Siagaetsyat®» wd a Jtestoteiliende · ■ has a winding? <3ar @ ix amgelaSigen Pol * ebvlie eioh j « while tifoox a big one. ireiiWiiiitel eratreeken tanA Tonelnander ün & ®h © © Jamale · aiea .. only via eiaen! your liDrekWinfetl .eretrvekeäiAe ·. Pellücjfeen are separated, while the lia ^ ißtsystem.eatJataltende Magnetiämfö ¹ * ¹ . . _ a '^ en Polseimtet gugÄetotes. They were '9t' a gleleii 'broad-'. ■ How-the-Folletfcen is formed. ■. .. /: · ■ ■ Stindeinriebtung naoA Ansprüeh-l »-dadurea gekean'w ^ lcdinett; .4eeis» 'ilagnstaystem ö © si @ n © 3? Ators in at least one' ewwi distributor electrode and one umlaiitenäe Y Teilor electrode \ w & * ' baltendian * ι. '· ■ Robert Bosch; GmbH '". ■■ ·' - '■ · X & / 2a'&, - ; ■ Stuttgart. ■■ .. '■ ■ ■■' - '-9? 5 ο. Ignition device according to claim 3 / characterized ge & ennjseiöhnet »that . · The runner of the generator containing the iagiietsystom on the The drive shaft of the revolving Yteilerele & troö® is arranged 5ο! Ignition device according to / iJaspruoh 2 to 4> .the over © inen (Jleioiirioliter on the base of the sohliesiabare WiokXung (3O ₅ 31) designed as coaxially arranged uuv Öes 'Bäagnötsystems.' and is housed in a name as ■ in the rpm Hing umsehloaenen lanenrataaeioh against the other 'WieJcluhgestirnseite is «rstreöfeenöen Ansät ζ ? aagn © tisoh leading yerhunclea. is« ■' - '- ^; ■.. ■. -'v;. _: -.; .- 'v ;.: -.; .- · - ■ ' 6 * Xünäeinrichtiüag according to iuaspipuch 5 ₉ 4a <3uych able to know 'that'! ·. Elng out;.! Sw © i. equally arranged sueinancier $ n Half tön bor * from &β> η & η 3 © <3o iainäest © iis one with her Ä (68, 69) -wears.; ... " \ , 7ο ignition device according to claim ... 2 to 6, 'thereby gefc @; nnj &giaMet> * the magnet system contains an equiaxed gaov drive shaft aui', "polarized" in the direction of the axis , and that on the Stimseitön öea magnet © »'stüoJce (559-60 ) put on ainfl, dere; n over, the TJmfang; 'i | ois -; | iaiiea? *; ■. laagneten protruding Eaöen (56, 57) abobogÄ approximately at right angles are uSd at their den ltolBQ} iahm & w \ g * BtBifc) M ^ -; '■ . turned outside in the axial direction Grstreoto - ndk *, scJ; u®l <r: Ä · .; sentence © '(53 f. 59-) ^: ' -rtrageia ».. ''. · ■ \"; .. ^; \ "'' v .'-- .. c ^ '- / ^; Θ »2ttD.delnrichtung to. Claims 2 to 6 "" aftureh eekwmeel <äo "i # / - 4ae". da © ifiagneteyeteat a ö®r 2yli »d« rÄahl der Brenia eatßpröohende number τοη ringsektorfönaigesi »in, -der. 'Poleriei »rteti ^: permanent magnets (82) contains» the pairwise Esslt,'; ■ 'Robert Bosch GmbH Ια? / Βρ H ₀ Ir ₀ 7602 Stuttgart 19 »β» 1963 poles of the same name each on a preferably tapering radially from the inside to the outside in a wedge shape Soft iron pole piece (81) make contact. 9. Ignition device according to claim 8, characterized in that the permanent magnets (82) and the pole pieces (81) are held together by a housing (83) made of non-magnetizable material, preferably plastic, enclosing them _e 1Oo ignition device according to claim 2 to 6 _S, characterized in that the magnet system has a one-piece permanent magnet (90) with a number of arms (91) protruding radially from the axis of rotation corresponding to the number of cylinders, which on their end faces, which are alternately polarized in the direction of rotation, are preferably composed of sheet metal Wear soft iron pole piece (93) with a narrow nose-shaped extension (94). 11 «Ignition device according to claims 1 to 10, characterized in that that the permanent magnetic generator has a dividers contains known adjusting device with which the The phase position of pulses relative to the crankshaft of the internal combustion engine can be shifted. 12ο ignition device according to claim 11, characterized in that between a drive shaft (41) coupled to the crankshaft of the internal combustion engine and the armature shaft (42) Plan weights (50, 51) equipped centrifugal adjusters are provided is.