US3575578A - Ignition distributor with improved cam timing means - Google Patents

Ignition distributor with improved cam timing means Download PDF

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Publication number
US3575578A
US3575578A US831084A US3575578DA US3575578A US 3575578 A US3575578 A US 3575578A US 831084 A US831084 A US 831084A US 3575578D A US3575578D A US 3575578DA US 3575578 A US3575578 A US 3575578A
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US
United States
Prior art keywords
ignition
breaker point
cam
switch means
distributor
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
US831084A
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English (en)
Inventor
Roger Habert
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Ducellier et Cie
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Ducellier et Cie
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Filing date
Publication date
Application filed by Ducellier et Cie filed Critical Ducellier et Cie
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Publication of US3575578A publication Critical patent/US3575578A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
    • F16K31/20—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/60—Devices for interrupted current collection, e.g. commutating device, distributor, interrupter

Definitions

  • the present invention is directed to an ignition distributor assembly which may provide an irregular firing cycle with adequate dwell time.
  • the present system employs three breaker point sets, two of which are connected in electrical parallel and the third of which is connected in series with the first two.
  • the distributor cam has a plurality of lobes equal to half the number of cylinders serviced and the first two sets of breaker points are operated with overlap to open and close the primary circuit of the ignition coil to produce alternate ignition sparks.
  • the third set of breaker points is operated subsequent to the operation of the first two to produce alternate ignition sparks.
  • the time of opening the third set of points may be chosen to produce a desired irregular firing cycle pattern.
  • FIG. I is a diagrammatic view illustrating an irregular firing cycle pattern
  • FIG. 2 is a plan view of a portion of the distributor constructed in accordance with the present invention.
  • FIG. 3 is a circuit diagram of the breaker point sets
  • FIG. 4 is a diagrammatic view illustrating the relative dispositions between the various breaker point sets and the distributor cam.
  • FIG. 5 is time base diagram illustrating the operations of the distributor point sets.
  • FIG. 2 The basic construction of a distributor in accord with the present invention may be seen in FIG. 2 wherein reference character 11 designates the conventional breaker plate and reference characters 2, 3, and 4 indicate in general the three sets of breaker points for producing an irregular firing cycle as is illustrated in FIG. 1.
  • a firing cycle such as is illustrated in FIG. 1 represents the firing cycle of a six cylinder engine which may be required in certain engine configurations.
  • a V-6 engine of small included angle between the banks of cylinders, i.e. other than 60 or 120, and operating with a crankshaft of conventional configuration may require the irregular firing cycle pattern depicted in FIG. 1.
  • the breaker points 2, 3 and 4 each embody a mounting bracket portion 5 by means of which they are removably secured to the breaker plate 1 and a conductor 6 is provided which extends to the ignition coil, completing, through the breaker point sets, the electrical circuit of the primary of the ignition coil.
  • a conductor 6 is provided which extends to the ignition coil, completing, through the breaker point sets, the electrical circuit of the primary of the ignition coil.
  • Each set of points also includes a rubbing block assembly 7 which operates to open and close the movable breaker point contact 8 with respect to the fixed contact point 11, each such breaker block portion 7 being provided with the respective tips 2a, 3a and 4a which are engaged by the individual lobes of the distributor cam 14 which is rotatably driven in the direction of the arrow shown in FIG. 2 in conventional fashion.
  • the movable arm 9 of each breaker point set is pivotally mounted on a post 10 provided on the mounting plate 5 and electrical connection to the movable arms is made by means of the spring member 13 which also serves to maintain the rubbing block tips 2a, 3a and 4a in contact with the cam lobes when engaged thereby.
  • the upstanding ears 18a and 18b on the mounting plate 5 respectively mount the fixed contact points 11 and the spring arms 13 and associated conductors 6 and 66. Additionally, provision is made at 12 for adjustment of the mounting plate 5 to vary the opening of the ignition points by allowing angular inward movement of the rubbing block tips 2a, 3a and 4a.
  • the two sets of points 2 and 3 are disposed in electrical parallel and are also disposed in series with the third set of points 4 and it will be appreciated that the cycle of operations is such that the set of points 2 first opens and, while still open, the second set of points 3 opens thereby to break the ignition coil primary circuit to produce a spark, whereafter the point set 2 will again close to reestablish the ignition coil primary circuit, whereafter the third set of points 4 will open to produce a second spark and will close before the next opening operation of the points 2 and 3.
  • FIG. 4 This is illustrated in FIG. 4 wherein the cam lobe 14a operation in the direction of distributor cam rotation as indicated by the arrow F is just engaging at point 15 with the breaker point rubbing block tip 2a.
  • the cam lobe 14b is spaced from the rubbing block tip 3a by the angle 6 as illustrated and the rubbing block tip 4a is angularly spaced from the cam lobe 14c by the angle or, the points of contact between the respective cam lobes 14b and with respect to their rubbing block tips 3a and 4a being designated by the reference characters 16 and 17.
  • FIG. 5 This is better illustrated in FIG. 5 wherein it will be seen that after the distributor cam 14 has rotated through the angle 9 in FIG. 4, during which time the point set 2 is open, the point set 3 will also be open and since the times t and t, representative of the dwell times of the points 2 and 3 overlap, the first shaded area in FIG. 5 represents the time during which the ignition coil primary circuit will be open to produce the first ignition spark. Subsequently, at the beginning time t the ignition points 4 will open to produce the second spark as indicated by the second shaded portion in FIG. 5. After the distributor cam 14 rotates through the angle B as indicated in FIG.
  • the next operation of the points 2 and 3 will be effected to produce a third spark, whereafter the breaker point set 4 produces the fourth spark and so on to produce the irregularly spaced firing cycle as depicted in FIG. 1.
  • the angle a will be seen to be equal to a. minus 9 whereas the angle [3 will 'of course be the angular separation between the point rubbing block tips 3a and 4a.
  • a number of cam lobes equal to half the number of cylinders serviced may be utilized thereby easily to provide the requisite dwell times due to the reduced number of lobes and the utilization of the three sets of points permits of a desired irregular pattern of ignition sparks to be provided.
  • first, second and third switch means for producing a succession of 1: electrical impulses per revolution of said cam, said first and second switch means being disposed in electrical parallel with each other and in series with said third switch means, said first and second switch means 5 being operated sequentially with overlap and said third switch means being operated subsequent to operation of said first and second switch means.
  • a rotatable cam having a' plurality of lobes
  • first, second and third normally closed breaker point assemblies circumferentially spaced around said cam for sequential actuation thereby
  • said first and second breaker point assemblies being disposed in electrical parallel and both being disposed in electrical series with said third breaker point assembly, said breaker point assemblies having respective rubbing blocks in which the rubbing blocks of said first and second breaker point assemblies are disposed for sequential engagement by said cam, with overlap, so that a first ignition spark is produced when said second breaker point assembly is opened, and the rubbing block of said third breaker point assembly being disposed for engagement by said cam subsequent to opening and then closing of said second breaker point assembly, so as to produce a second ignition spark prior to the next actuation of said first and second breaker point assemblies to produce a third ignition spark.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US831084A 1968-06-18 1969-06-06 Ignition distributor with improved cam timing means Expired - Lifetime US3575578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR155438 1968-06-18

Publications (1)

Publication Number Publication Date
US3575578A true US3575578A (en) 1971-04-20

Family

ID=8651298

Family Applications (1)

Application Number Title Priority Date Filing Date
US831084A Expired - Lifetime US3575578A (en) 1968-06-18 1969-06-06 Ignition distributor with improved cam timing means

Country Status (6)

Country Link
US (1) US3575578A (enrdf_load_stackoverflow)
BE (1) BE732923A (enrdf_load_stackoverflow)
DE (1) DE1930639A1 (enrdf_load_stackoverflow)
FR (1) FR1588818A (enrdf_load_stackoverflow)
GB (1) GB1229106A (enrdf_load_stackoverflow)
NL (1) NL6909220A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702384A (en) * 1971-05-16 1972-11-07 Cesar M Garza Distributor for six cylinder internal combustion engine including two cam operated contact breaker assemblies
US3916863A (en) * 1972-10-21 1975-11-04 Bosch Gmbh Robert Electrical signal generating device for use in combustion engines

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539347A (en) * 1947-06-26 1951-01-23 Cook Electric Co Fuel selector switch
US2579928A (en) * 1948-06-28 1951-12-25 Kangas Ernest Jacob Primary ignition system
US2780488A (en) * 1955-08-04 1957-02-05 William P Kennedy Adjustable pattern irrigation sprinkling device
US2821580A (en) * 1955-10-31 1958-01-28 George S Black Switch
US3189696A (en) * 1962-10-12 1965-06-15 United Gas Corp Device for regulating multiple concurrent electric pulses
US3189695A (en) * 1962-10-12 1965-06-15 United Gas Corp Device for regulating multiple concurrent electrical pulses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539347A (en) * 1947-06-26 1951-01-23 Cook Electric Co Fuel selector switch
US2579928A (en) * 1948-06-28 1951-12-25 Kangas Ernest Jacob Primary ignition system
US2780488A (en) * 1955-08-04 1957-02-05 William P Kennedy Adjustable pattern irrigation sprinkling device
US2821580A (en) * 1955-10-31 1958-01-28 George S Black Switch
US3189696A (en) * 1962-10-12 1965-06-15 United Gas Corp Device for regulating multiple concurrent electric pulses
US3189695A (en) * 1962-10-12 1965-06-15 United Gas Corp Device for regulating multiple concurrent electrical pulses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702384A (en) * 1971-05-16 1972-11-07 Cesar M Garza Distributor for six cylinder internal combustion engine including two cam operated contact breaker assemblies
US3916863A (en) * 1972-10-21 1975-11-04 Bosch Gmbh Robert Electrical signal generating device for use in combustion engines

Also Published As

Publication number Publication date
DE1930639A1 (de) 1970-01-08
GB1229106A (enrdf_load_stackoverflow) 1971-04-21
NL6909220A (enrdf_load_stackoverflow) 1969-12-22
FR1588818A (enrdf_load_stackoverflow) 1970-03-16
BE732923A (enrdf_load_stackoverflow) 1969-10-16

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