US3744466A - Ignition distributor with control generator for internal combustion engines - Google Patents

Ignition distributor with control generator for internal combustion engines Download PDF

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Publication number
US3744466A
US3744466A US00163374A US3744466DA US3744466A US 3744466 A US3744466 A US 3744466A US 00163374 A US00163374 A US 00163374A US 3744466D A US3744466D A US 3744466DA US 3744466 A US3744466 A US 3744466A
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US
United States
Prior art keywords
stator
rotor
combination
drive shaft
bearing sleeve
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
US00163374A
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English (en)
Inventor
G Jakob
H Kalippke
H Brammer
G Hohne
G Brand
G Sohner
K Ehrmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3744466A publication Critical patent/US3744466A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • F02P7/0675—Electromagnetic pick-up devices, e.g. providing induced current in a coil with variable reluctance, e.g. depending on the shape of a tooth

Definitions

  • Striker 51 ABSTRACT The minimal clearances between the pole teeth of th stator and rotor of the control generator in an ignition distributor for internal combustion engines are independent of eventual stray movements of the drive shaft by mounting the stator on the drive shaft so that the stator and the rotor of the control generator share all stray movements of the drive shaftbut the rotor is free to rotate, without contact, relative to the stator.
  • The'stator is angularly adjustable with reference to the drive shaft bya link which changes its position in response to pressure changes in the intake manifold of the internal combustion engine.
  • the drive shaft has a male portion which is journalled in the housing of the ignition distributor and a sleeve which-is rotatably mounted on the male portion and supports the stator and the rotor of the control generator.
  • the sleeve receives torque from the male portion by means of a centrifugal advance mechanism.
  • the entire rotor, portions of the rotor, and/or portions of the stator can be made of a sintered material.
  • the present invention relates to ignition distributors for internal combustion engines, and more particularly to improvements in ignition distributors of the type having a magnetic control generator.
  • the control generator comprises a stator which is fixedly or adjustably secured to the housing of the ignition distributor and a rotor which is rotated by the drive shaft of the ignition distributor.
  • the control generator must furnish voltage impulses at the time when the engine operates at normal speed as well as during idling of the engine. Even those voltage impulses which are generated during idling of the engine must exceed the voltage-at which the electronic switching element responds to thus insure the generation of voltage which suffices for the firing of spark plugs.
  • the intensity of impulses furnished by the control generator is a function of the speed and extent of variations of magnetic flux which influence the induction coil of the generator, and the extent of such variations is a function of the magnitude of working clearance or gap between the stator and rotor of the control generator.
  • the clearance between the relatively movable parts of the stator and rotor in the control generator cannot be reduced beyond a certain value because the stator is either fixedly or adjustably' mounted in the housing of the ignition distributor whereas the rotor of the control generator rotates with the drive shaft. Therefore, the rotor shares all axial, wobbling and/or other stray movements of the drive shaft and the clearance between the rotor and the stator must be large enough to account for eventual stray movements of the drive shaft with reference to the housing of the ignition distributor (and hence with reference to the stator).
  • the clearance between the rotor and the stator must be much larger than would be absolutely necessary to avoid contact between the rotor and the stator if the rotor were compelled to remain at all times in exact axial alignment with the stator. Therefore, the reduction of clearance between the stator and rotor of a conventional control generator can be achieved only by machining the parts of the ignition distributor with a very high degree of precision so as to reduce stray movements of the drive shaft and of the rotor with reference to the housing of the ignition distributor and the stator of the control generator. This obviously involves a much higher manufacturingcost; furthermore, some stray movements will develop without fail on prolonged use of the ignition distributor.
  • An object of the invention is to provide an ignition distributor for internal combustion engines wherein the minimum clearances between the stator and rotor of the built-in control generator can be much smaller than in presently known ignition distributors without necessitating a higher precision in the manufacture of component parts. 7
  • Another object of the invention is to provide a novel and improved mounting for the stator of the control generator in an ignition distributor for internal combustion engines.
  • a further object of the invention is to provide a control generator wherein the clearances between the stator and the rotor are not affected by eventual axial, wobbling and/or other stray movements of the rotor with reference to the housing of the ignition distributor.
  • An additional object of the invention is to provide an ignition distributor wherein the stator of the control generator is mounted in the above outlined manner and can be adjusted to account for changes in the load upon the engine.
  • Still another object of the invention is to provide a novel and improved control generator which can be built into presently known ignition distributors by necessitating relatively minor changes in the design of such distributors.
  • a further object of the invention is to provide a control'generator which, even though not larger than presently known control generators, canproduce impulses of greater intensity not only when the engine is operated at a high RPM but also at the idling speed of the engine.
  • the invention resides in an ignition distributor for internal combustion engines which comprises a housing, a drive shaft which is rotatable in the housing and preferably includes a male portion which is directly journalled in the housing and a female portion or sleeve which surrounds the male portion and is coupled thereto by a centrifugal advance mechanism, and a magnetic control generator which has a rotor fixedly secured to'the sleeve and a stator which is closely adjacent to but out of contact with the rotor and is mounted on the sleeve in such a way that the sleeve is rotatable with the rotor relative to the stator but that the stator shares all eventual stray movements of the sleeve with reference to the male portion of the drive shaft and/or with reference to the housing.
  • FIG. 1 is a'central vertical sectional view of an ignition distributor which embodies the invention, the sec- 4 tion being taken in the direction of arrows as seen from the line I-I of FIG. 2; and
  • FIG. 1 is a horizontal sectional view of the ignition DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the ignition distributor 10 comprises a'housing having a base assembly 11 with a sleeve 11a and a cap provided with a center electrode 21 and six equidistant distributorelectordes 22.
  • the sleeve 11a of the base assembly 11 surrounds a two-piece drive shaft 12 which is rotated by the internal combustion engine, not shown.
  • the lower portion of the base assembly 11 accommodates a centrifugal advance mechanism 13 which has a weight base 14 secured to the male portion 12a of the drive shaft 12 and supporting two advance weights 16 (one shown) mounted on pivot pins 15.
  • the advance cam 17 of the mechanism 13 is secured to a female por tion or sleeve 18 of the drive shaft 12 which surrounds the male portion 12a.
  • the advance weights 16 are mounted diametrically opposite each other.
  • the mechanism 13 couples the sleeve 18 for rotation with the male portion 12a.
  • the sleeve 18 supports a distributor rotor 19 which is surrounded by the cap 20 of the distributor housing and serves to transmit ignition impulses from an ignition coil (not shown) connected with the center electrode 21 'to successive distributor electrodes 22.
  • the electrodes 22 are connected with the spark plugs (not shown) of the internal combustion engine.
  • the base assembly 11 of the distributor housing further surrounds a novel control generator 23 which is mounted between the distributor rotor 19 and the centrifugal advance mechanism 13.
  • the control generator 23 serves to produce a voltage impulse at the time of firing of spark plugs; such impulses serve to control an electronic switching element (not shown) to thus initiate the release of high-voltage impulses in the ignition coil.
  • the control generator 23 comprises a rotor 25 which is secured to the sleeve 18 for rotation therewith and a stator 24 which rotatably surrounds the sleeve 18.
  • the stator 24 comprises a disk-shaped support 26 and a ring-shaped permanent magnet 27 which is magnetized in the axial direction.
  • the lower end face of the permanent magnet 27 abuts against the upper side of the support 26 and its upper end surface carries a ringshaped pole shoe 28 having an upwardly extending cylindrical extension or collar 28a.
  • the latter is surrounded by an annular induction coil 29 which is mounted in a frame 30 consisting of synthetic plastic material.
  • the frame 30 is secured to the support 26 of the stator 24 by one or more screws 31 or analogous fasteners; these fasteners simultaneously hold the permanent magnet 27 and the pole shoe 28 against movement with reference to the support 26.
  • the stator 24 further includes a bearing sleeve or muff 32 which snugly surrounds a median portion of the sleeve 18.
  • the muff 32 consists of nonferrous material, preferably a sintered material. Such material is permeated with oil or another lubricant and the muff 32 is a press-fit in the axial passage or bore 33 of the support 26.
  • the lower end face of the muff 32 abuts against a split ring 34 which is recessed into a circumferential groove of the sleeve 18.
  • the support 26 of the stator 24 is further provided with a radialy extending elongated opening or slot 47 for the stem of a coupling bolt or projection 35 which extends into the slot 47 from below and is riveted to an intermediate portion of a motion transmitting or displacing link 36.
  • one end portion of the link 36 extends into an adjusting device 37 and is attached therein to a diaphragm (not shown).
  • the adjusting device 37 is fixedly secured to the base assembly 11 of the distributor housing by a bracket 37a and screws 37b.
  • the other end portion 360 of the link 36 is reciprocable in a guide portion 48 provided on the internal surface of the base assembly 11.
  • the adjusting device 37 is connected with the intake manifold (not shown) of the engine by two flexible conduits 38 and 39, for example, in a manner asdisclosed in the copending application Ser. No. 787,021 of Harald Kalippke et al.
  • the diaphragm .in the adjusting device 37 is flexed in response to pressure changes in the intake manifold whereby the link 36 moves lengthwise and changes the angular position of the stator 24 with reference to the sleeve 18. Since the end portion 36a of the link 36 extends into the guide portion48 and the stem of the coupling bolt 35 extends into the radial slot 47 of the support 26, axial-movements of the control generator 23 cannot bring about any changes in the position of the link 36.
  • the periphery of the support 26 is provided'with six equidistant upwardly bent pole teeth 40 which are outwardly adjacent to the permanent magnet 27, pole shoe 28, coil 29 and frame 30.
  • the teeth 40 cooperate with six equidistant pole teeth 41 of the rotor 25.
  • the latter further comprises a disk-shaped portion 42 which is provided with the teeth 41, and a hollow shaft 43.
  • the teeth 41 extend radially outwardly from the disk 42.
  • the minimum clearance 46 between the teeth 40 'and 41 of the stator 24 and rotor 25 is 0.35 millimeters.
  • the hollow shaft 43 of the rotor25 abuts against the upper end face 32b of the mufi 32 and is held against rotation with reference to the sleeve 18 by means of an axially parallel coupling pin 44 which extends into registering recesses of the parts 18 and 43.
  • an axially parallel coupling pin 44 which extends into registering recesses of the parts 18 and 43.
  • the collar 28a of the pole shoe 28 is concentric with and surrounds the shaft 43 of the rotor 25 with a minimal radial clearance, e.g., in the range of 0.2 millimeters.
  • the magnetic force lines issuing from the pennanent magnet 27 pass through the pole shoe 28, collar 28a, across the annular clearance between the parts 28a, 43, through the hollow shaft 43 and into the diskshaped portion 42.
  • the magnetic force lines pass radially outwardly through the portion 42 and its teeth 41, across the clearances 46 between the teeth 41 and 40, through the support 26 and back to the permanent magnet 27.
  • the annular coil 29 which surrounds the collar 28a of the pole shoe 28 is interlinked with the entire flow of magnetic force lines.
  • the male portion 12a of the drive shaft 12 rotates the sleeve 18 through the intermediary of the centrifugal advance mechanism 13.
  • the stator 24 is held against rotation with the sleeve 18 by the link 36 so that the sleeve 18 rotates in the muff 32.
  • the distributor rotor 19 rotates with the rotor 25 of the control generator 23 whereby the teeth 41 of the diskshaped portion shown in the rotor 25 rotate with reference to the teeth 40 on the support 26 of the stator 24.
  • the distance between the teeth 40, 41 varies continuously when the rotor 25 is driven by the sleeve 18 because the teeth 41 first approach and thereupon move away from the teeth 40.
  • Such changes in the width of clearances between the teeth 40, 41 entail corresponding changes in magnetic resistance and flux in the magnetic circuit of the control generator 23.
  • the change in flux reaches its maximum value when the teeth 41 are nearest to the teeth 40 (see the position of the rotor 25 as shown in FIG. 2).
  • Such changes in flux induce in the coil 29 two voltage impulses one of which is used for actuation of an electronic switching element to produce a spark at one of the spark plugs. Since the stator 24 has six teeth 40 and the rotor 25 has six teeth 41, the induced voltage impulses in the coil 29 cause the firing of six spark plugs during each revolution of the sleeve 18.
  • the timing of sparks can be advanced in dependency on the RPM 0f the engine by way of the centrifugal advance mechanism 13, Le, in response to pivoting of advance weights 16 on their pins 12 whereby the advance cam 17 turns the sleeve 18 and the rotor 25 in the direction of rotation of the male portion 12a of the drive shaft 12.
  • An adjustment of the timing of spark generation in dependency on pressure changes in the intake manifold of the engine (and hence in dependency on the load upon the engine) is effected by the link 36 which can change the angular position of the stator 24 with reference to the sleeve 18.
  • the entire rotor 25 can be made of a single piece of sintered iron.
  • the parts 26, 32, 28 and 28a can be made of a single piece of sintered iron. This further reduces the tolerances in the dimensioning of minimum clearances 46 between the teeth 40 of the stator 24 and the teeth 41 of the rotor 25.
  • stator 24 of the control generator 23 is rotatable with reference to the sleeve 18 (i.e., that the sleeve 18 can rotate in the stator 24) without any appreciable clearance.
  • bearing sleeve or muff 32 which cannot move axially of the sleeve 18 and is a press-fit in the support 26 of the stator 24) compels the stator to share all axial and/or wobbling movements of the sleeve 18.
  • the minimum clearances 46'between the teeth 40 and 41 are not affected by eventual axial, wobbling and/or other stray movements of the sleeve 18 with reference to the male portion 120 of the drive shaft 12. Consequently, the minimum width of the clearances 46 remains unchanged and such clearances can be much smaller than in conventional ignition distributors wherein the stator of the control generator is affixed to the housing of the ignition distributor or is adjustably supported by such housing so that it can change its position in response to pressure changes in the intake manifold of the engine.
  • Relatively small clearances 46 between the teeth 40 and 41 insure that the control impulses of the generator 23 are stronger than those produced by conventional generators of identical dimensions.
  • the rotor 25 can be mounted directly on the male portion of the drive shaft 12 and the latter is then rotatable directly in the bearing sleeve or muff 32 for the stator 24. Such simplified construction can be resorted to if the sleeve 18 and the centrifugal advance mechanism 13 are omitted.
  • bearing sleeve consists of sintered material.
  • bearing sleeve consists of sintered material which is permeated with a lubricant.
  • said I rotor comprises a hollow shaft surrounding said second portion of said drive shaft, a disk rigid with said hollow shaft, and pole teeth extending radially outwardly from said disk, said hollow shaft and said bearing sleeve having abutting end faces and further comprising means for coupling said hollow shaft to said second portion of said drive shaft so that said rotor shares all movements of said second portion.
  • stator further comprises an axially magnetized ringshaped permanent magnet on said support, said permanent magnet surrounding said bearing sleeve and having an end face remote from said support and provided with a ring-shaped pole shoe.
  • said rotor comprises a hollow shaft surroudning said drive shaft and said pole shoe comprises a cylindrical extension surrounding said hollow shaft.
  • a combination as defined in claim 1 furthercomprising means for angularly adjusting said stator with reference to said drive shaft in response to pressure changes in the intake manifold of the engine.
  • said adjusting means comprises a link which is arranged to move lengthwise in response to pressure changes in the intake manifold.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
US00163374A 1970-07-31 1971-07-16 Ignition distributor with control generator for internal combustion engines Expired - Lifetime US3744466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2038037A DE2038037C3 (de) 1970-07-31 1970-07-31 Zündverteiler fur Brennkraftmaschinen mit Steuergenerator

Publications (1)

Publication Number Publication Date
US3744466A true US3744466A (en) 1973-07-10

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US00163374A Expired - Lifetime US3744466A (en) 1970-07-31 1971-07-16 Ignition distributor with control generator for internal combustion engines

Country Status (6)

Country Link
US (1) US3744466A (de)
JP (1) JPS503459B1 (de)
DE (1) DE2038037C3 (de)
ES (1) ES197488Y (de)
FR (1) FR2099393A5 (de)
GB (1) GB1356200A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855983A (en) * 1973-03-26 1974-12-24 Motorola Inc Magnetic sensor device for ignition systems
US3916863A (en) * 1972-10-21 1975-11-04 Bosch Gmbh Robert Electrical signal generating device for use in combustion engines
JPS5171429A (ja) * 1974-12-18 1976-06-21 Hitachi Ltd Nainenkikanyohaidenki
US4307698A (en) * 1978-02-24 1981-12-29 Hitachi, Ltd. Distributor for contactless ignition apparatus for internal combustion engine
US4365609A (en) * 1980-01-23 1982-12-28 Nippondenso Co., Ltd. Distributor assembly having an ignition coil therein
US4463715A (en) * 1981-08-11 1984-08-07 Robert Bosch Gmbh Otto engine ignition pulse generator and distributor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783314A (en) * 1972-12-20 1974-01-01 Ford Motor Co Signal generating mechanism
DE2357061C2 (de) * 1973-11-15 1985-02-14 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur Abgabe von gleichmäßigen Impulsen bei bestimmten Winkelstellungen einer drehbaren Welle und zur Bildung von wenigstens einem Bezugssignal
DE2450773C3 (de) * 1974-10-25 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Anschluß zwischen Spule und der das durch eine Verteilerkappe verschlossene Verteilergehäuse durchquerenden Steuerleitung bei einem Zündverteiler mit magnetischem Steuergenerator für Brennkraftmaschinen
IT1064359B (it) * 1976-11-11 1985-02-18 Magneti Marelli Spa Perfezionamento ai distributori d'accensione di motori a combustione interna provvisti di correttore d'anticipo a depressione
JPS5527837A (en) * 1978-08-14 1980-02-28 Ngk Insulators Ltd Polycrystal transparent spinel sintered article and its manufacture
DE3418706A1 (de) * 1984-05-19 1985-11-21 Robert Bosch Gmbh, 7000 Stuttgart Zuendverteiler fuer brennkraftmaschinen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916863A (en) * 1972-10-21 1975-11-04 Bosch Gmbh Robert Electrical signal generating device for use in combustion engines
US3855983A (en) * 1973-03-26 1974-12-24 Motorola Inc Magnetic sensor device for ignition systems
JPS5171429A (ja) * 1974-12-18 1976-06-21 Hitachi Ltd Nainenkikanyohaidenki
US4307698A (en) * 1978-02-24 1981-12-29 Hitachi, Ltd. Distributor for contactless ignition apparatus for internal combustion engine
USRE32168E (en) * 1978-02-24 1986-06-03 Hitachi, Ltd. Distributor for contactless ignition apparatus for internal combustion engine
US4365609A (en) * 1980-01-23 1982-12-28 Nippondenso Co., Ltd. Distributor assembly having an ignition coil therein
US4463715A (en) * 1981-08-11 1984-08-07 Robert Bosch Gmbh Otto engine ignition pulse generator and distributor

Also Published As

Publication number Publication date
JPS503459B1 (de) 1975-02-05
ES197488Y (es) 1975-09-16
DE2038037B2 (de) 1978-08-24
DE2038037C3 (de) 1979-04-05
DE2038037A1 (de) 1972-02-03
ES197488U (es) 1975-04-16
FR2099393A5 (de) 1972-03-10
GB1356200A (en) 1974-06-12

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