WO1984001000A1 - Procede de charge sur place d'un aimant de distributeur - Google Patents

Procede de charge sur place d'un aimant de distributeur Download PDF

Info

Publication number
WO1984001000A1
WO1984001000A1 PCT/US1982/001168 US8201168W WO8401000A1 WO 1984001000 A1 WO1984001000 A1 WO 1984001000A1 US 8201168 W US8201168 W US 8201168W WO 8401000 A1 WO8401000 A1 WO 8401000A1
Authority
WO
WIPO (PCT)
Prior art keywords
engine
sensor
distributor
orienting
magnetic
Prior art date
Application number
PCT/US1982/001168
Other languages
English (en)
Inventor
David H Fox
Charles C Kostan
Frank B Casaceli
Original Assignee
Ford Werke Ag
Ford France
Ford Motor Co
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 Ford Werke Ag, Ford France, Ford Motor Co filed Critical Ford Werke Ag
Priority to JP50306982A priority Critical patent/JPS59501470A/ja
Priority to EP19820903092 priority patent/EP0118437A1/fr
Priority to PCT/US1982/001168 priority patent/WO1984001000A1/fr
Publication of WO1984001000A1 publication Critical patent/WO1984001000A1/fr

Links

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
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • F02P7/0677—Mechanical arrangements

Definitions

  • This invention relates to a method for orienting a magnetic element for producing an electrical signal in synchronism with the periodic movement of a piston in an internal combustion engine.
  • U.S. patent 3,517,142 to Hans-Dieter Bastam et al teaches a typical mechanical connection where a signal generator assembly is mounted on a distributor shaft and cooperates with two pivotable contacts.
  • U.S. patent 4,235,213 to Jellissen teaches an ignition system housing to provide timing signals for an automotive ignition distributor system.
  • a housing is mounted on a swing arm. The housing is fixed in position and locked in place by screws engaged in the threaded central bores of the housing.
  • the housing is attached to the swing arm by having bosses positioned within the cavities.
  • a method of assembling a distributor includes integrally mounting a distributor rotor and shaft assembly directly to a camshaft, then positioning an uncharged magnet on the distributor shaft assembly and charging the magnet in place thereby insuring accurate engine initial timing.
  • the charging occurs after a known engine position is estab ⁇ lished.
  • Such in place charging of the magnet eliminates manufacturing tolerances that contribute to inaccuracies between the indicated and actual crankshaft positions.
  • Fig. 1 is a cross-section of a distributor mounted on an engine camshaft in accordance with an embodiment of this invention
  • FIG. 2 is an end view of an intermediate shaf which is coupled to the engine camshaft;
  • Fig. 3 is an end view of a magnet to be mounted o the intermediate shaft in accordance with an embodiment o this invention
  • Fig. 4 is an elevation view of a magnetic chargin tool for a distributor in accordance with an embodiment o this invention
  • Fig. 5 is a section view taken generally alon section line 5-5 of Fig. 4 and includes a portion of the distributor of Fig. 1 to show how the magnetic chargin tool mates with the distributor;
  • Fig. 6 is a top view of the rotor of a distributo in accordance with an embodiment of this invention.
  • Fig. 7 is a side view of an engine and a distributor " mounted thereon in accordance with an embodiment of this invention.
  • distributor 10 is directly mounted on a camshaft 20 of an engine 22.
  • An intermediate shaft 12 is mounted and oriented directly on camshaft 20 eliminating the need for any bearings.
  • a ring-like magnet 14 is positioned on intermediate shaft 12 to provide an indication of the rotational position of intermediate shaft 12, of camshaft 20 and therefore of the engine crankshaft. Magnetic poles are induced in magnet 14 after magnet 14 is positioned on intermediate shaft 12.
  • Such in place charging of magnet 14 (Fig. 5) permits accurate correlation between the rotational position of the magnetic poles on magnet 14 and the rotational position of the crankshaft in engine 22. As a result, it is possible to compensate for manufacturing tolerances which may otherwise contribute to inaccuracies.
  • Inter ediate shaft 12 is a generally hollow cylinder with decreasing diameter toward the end mounted on the outer diameter of camshaft 20.
  • a screw 34 in combina ⁇ tion with a washer 36 is attached to a mounting stud 30 and engages an insert 38 coupled to intermediate shaft 12 thereby securing intermediate shaft 12 to mounting stud 30.
  • Mounting stud 30 has a threaded portion 31 which screws into the central opening of camshaft 20.
  • Intermediate shaft 12 has a plurality of radial, circumferentially spaced openings at the end adjacent camshaft 20.
  • Insert 38 is a web that extends through the radial openings in intermediate shaft 12 and has integral circumferential ring-like portions both inside and outside intermediate shaft 12.
  • Intermediate shaft 12 is formed of a combination of powdered metal and plastic.
  • insert 38 is also formed of a plastic and powdered metal combination and formed in place by injection arcund intermediate shaft 12.
  • a lip seal 42 between insert 38 and engine head 24 acts as a seal to keep oil in passages 26 around camshaft 20 from leaking from engine 22.
  • a shoulder portion 64 of intermediate shaft 12 supports magnet 14 as shown in Fig. 2. Shoulder portion 64 has circumferential, outwardly facing teeth 66. Magnet 14 (Fig. 3) has circumferential, inwardly facing teeth 68 for engaging teeth 66.
  • the end of intermediate shaft 12 projecting away from engine 22 supports a rotor 46 (see Fig. 6).
  • Rotor 46 carries a staple-like electrode 48 and spring 50.
  • the mounting of spring 50 on rotor 46 is accomplished by a compression fit and uses no secondary mounting process such as a rivet or a heat stake.
  • Rotor 46 includes a clamp-like ledge 47 to hold down spring 50.
  • a back stop 49 acts in cooperation with ledge 47 to positively hold spring 50 to rotor 46.
  • Such a construction for attaching spring 50 provides a positive locking feature to electrode 48 thus
  • Staple-like electrode 48 reduces cost o manufacturing.
  • the wire drawn material minimizes materia costs and weight.
  • the staple form can be obtained b relatively low cost tooling.
  • the sharp pointed electrod design also reduces the generation of high levels of radi frequency interference.
  • Sensor 54 (Figs. 1 and 5) is coupled to a electronic engine control and provides crankshaft positio information.
  • Sensor 54 is a bipolar Hall-type device. Th bipolar feature results in a sensor that switches on an off by being subjected to a positive magnetic flux and negative magnetic flux after experiencing a zero flu condition at transitions between positive and negativ magnetic flux.
  • a positive magnetic flux is associated wit the passage of a north magnetic pole on magnet 14 and negative magnetic flux is associated with the passage of south magnetic pole on magnet 14.
  • a sensor holder 52 (Figs. 1, 5 and 7) is mounted on head 24 and supports bipolar Hall-type sensor 54 in proximity to magnet 14.
  • Sensor holder 52 includes charging tool locating holes 56 for receiving pins 72 positioning a charging tool 70 to charge magnet 14 (see Fig. 5). Accordingly, after magnet 14 is positioned on intermediate shaft 12, sensor holder 52 is mounted on head 24, and the engine position is determined to be in a known position (such as top dead center of cylinder one).
  • Sensor holder 52 also supports distributor cap 58 in proximity to spring 50 and electrode 48 so that a firing voltage can be supplied through a central electrode 60 to spring 50 and distributed through electrode 48 to a plurality of spark plug associated electrodes 62 (Fig. 1).
  • Charging tool 70 (Figs 4 and 5) is generally circular with a protruding handle 74.
  • a circular pilot 76 extends along the axis of charging tool 70 ' for engaging the central opening of intermediate shaft 12.
  • a pair of pins 72 extend parallel to pilot 76 for engaging locating holes 56.
  • a partially hollow cylindrical portion 78 extends around pilot 76 along the outside of intermediate shaft 12 to magnet 14.
  • An undulating conductor bus bar 80 is supported by cylindrical portion 78 adjacent magnet 14. The undulations are, in sequence, axially upward, circumferential, axially downward, circumferential, axially upward, and so on.
  • the axial portions of bus bar 80 are spaced about 45° apart so that current flowing in bus bar 80 induces eight magnet poles in magnet 14.
  • Magnet 14 is mounted on intermediate shaft 12 as an uncharged injection molded plastic magnet containing oriented magnetic dipoles.
  • the engine crankshaft is positioned to a known positon (relative to top dead center of cylinder number one) and a magnetizing fixture is located relative to sensor 54 and magnet 14. At this point, torque can be applied to camshaft 20 to take up any timing belt looseness and the magnet 14 is magnetized.
  • Ring-like magnet 14 is magnetized relative to a known engine position so that the 45° north and south poles are generated alternately over the outer diameter of the magnetic in a location such that the sensor switches at a prescribed point relative to the known engine position.
  • bipolar Hall-type sensor 54 is potted in the plastic base which is mounted directly to the engine head to assure a positive known location in relation to the rotation of the magnet.
  • the crankshaft can be located at 35° after top dead center (ATDC) so that charg ⁇ ing conductors can be equally spaced around sensor. This will result in a signal being generated at 10° before top dead center (BTDC) by the sensor during engine operation.
  • X £ NA Sensor 54 is triggered by a low magnetic flu level, such as plus and minus 50 gauss around a zero flu transition point, and its sensitivity to air gap size temperature and run-out variation is minimal.
  • the maximu amplitude of magnetic flux at the pole face i approximately 900 gauss.
  • Sensor holder 52 also contains pole piece 55 (Fig. 1) adjacent sensor 54 to focus th magnetic flux from magnet 14 thereby concentrating the flu to improve the accuracy of sensor 54.
  • pole piece 55 Fig. 1
  • the particular configura tion of the sensor holder may be varied from that describe herein.

Landscapes

  • 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)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Un procédé d'assemblage d'un distributeur (10) comprend le montage intégrant d'un anneau magnétisable (14) directement sur un arbre à cames (20) et la formation de pôles magnétiques sur l'anneau (14) lorsque le moteur se trouve en position connue. Un détecteur (54) possède une position connue par rapport aux pôles de l'anneau (14) et est utilisé pour donner des informations au sujet de la rotation du moteur.
PCT/US1982/001168 1982-08-27 1982-08-27 Procede de charge sur place d'un aimant de distributeur WO1984001000A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP50306982A JPS59501470A (ja) 1982-08-27 1982-08-27 デイストリビユ−タマグネツトのサイトチヤ−ジの方法
EP19820903092 EP0118437A1 (fr) 1982-08-27 1982-08-27 Procede de charge sur place d'un aimant de distributeur
PCT/US1982/001168 WO1984001000A1 (fr) 1982-08-27 1982-08-27 Procede de charge sur place d'un aimant de distributeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1982/001168 WO1984001000A1 (fr) 1982-08-27 1982-08-27 Procede de charge sur place d'un aimant de distributeur

Publications (1)

Publication Number Publication Date
WO1984001000A1 true WO1984001000A1 (fr) 1984-03-15

Family

ID=22168162

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1982/001168 WO1984001000A1 (fr) 1982-08-27 1982-08-27 Procede de charge sur place d'un aimant de distributeur

Country Status (3)

Country Link
EP (1) EP0118437A1 (fr)
JP (1) JPS59501470A (fr)
WO (1) WO1984001000A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3308341A (en) * 1964-02-10 1967-03-07 Motorola Inc Transistorized ignition system utilizing a magnetically actuated reed switch
US3577970A (en) * 1968-09-27 1971-05-11 Gen Motors Corp Internal combustion engine ignition systems
US4150653A (en) * 1976-02-04 1979-04-24 Thomson-Csf System employing a magnetosensitive element for producing an electric signal in synchronism with the periodic movement of a part and application thereof in internal combustion engines
US4155340A (en) * 1977-03-28 1979-05-22 Gulf & Western Manufacturing Company Solid state ignition system
US4165726A (en) * 1977-10-05 1979-08-28 Chrysler Corporation Low mass breakerless ignition distributor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3308341A (en) * 1964-02-10 1967-03-07 Motorola Inc Transistorized ignition system utilizing a magnetically actuated reed switch
US3577970A (en) * 1968-09-27 1971-05-11 Gen Motors Corp Internal combustion engine ignition systems
US4150653A (en) * 1976-02-04 1979-04-24 Thomson-Csf System employing a magnetosensitive element for producing an electric signal in synchronism with the periodic movement of a part and application thereof in internal combustion engines
US4155340A (en) * 1977-03-28 1979-05-22 Gulf & Western Manufacturing Company Solid state ignition system
US4165726A (en) * 1977-10-05 1979-08-28 Chrysler Corporation Low mass breakerless ignition distributor

Also Published As

Publication number Publication date
JPS59501470A (ja) 1984-08-16
EP0118437A1 (fr) 1984-09-19

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