US2896120A - Ignition noise suppressor - Google Patents

Ignition noise suppressor Download PDF

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Publication number
US2896120A
US2896120A US629373A US62937356A US2896120A US 2896120 A US2896120 A US 2896120A US 629373 A US629373 A US 629373A US 62937356 A US62937356 A US 62937356A US 2896120 A US2896120 A US 2896120A
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US
United States
Prior art keywords
tube
ferrite
conductor
ignition
ignition noise
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
US629373A
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English (en)
Inventor
Spittler Heinrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US2896120A publication Critical patent/US2896120A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/021—Mechanical distributors
    • F02P7/025—Mechanical distributors with noise suppression means specially adapted for the distributor
    • 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
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/025—Reducing interference from ignition apparatus of fuel engines

Definitions

  • One of the objects of the present invention is to overcome the above drawbacks with a structure which is far less expensive and far simpler than the conventional structures and which also operates in a fully satisfactory manner.
  • Another object of the present invention is to provide a device capable of accomplishing the above objects and having such dimensions that the conventional structures which carry the device of the invention need not be basically changed from their conventional form.
  • the present invention mainly consists of an apparatus for suppressing ignition noise in wireless equipment, this apparatus including an electrical source of interference and electrical conductors respectively leading to and from the source of interference.
  • a ferrite tube surrounds one of these conductors so that the latter passes through the ferrite tube, and the latter tube cooperates with the conductor to act principally as a resistance at relatively high frequencies.
  • Fig. 1 is a sectional elevational view of the device of the invention incorporated into a sparkplug
  • Fig. 2 is a sectional elevational view of the device of the invention incorporated into a distributor of an internal combustion engine.
  • Coils having ferrite cores have a complex permeability which can be split up into an inductive permeability and a real resistive permeability. Both of these components are dependent upon the frequency, and the real resistive permeability component predominates at high frequencies such as, for example, frequencies greater than 1 megacycle.
  • the absolute values of the inductance and resistance of the ferrite assembly can be controlled by varying the additions to the iron oxide.
  • Ferrite has proved to be particularly suitable for suppressing ignition noise in devices for Wirelessly transmitting electrical signals or pictures at the above relatively high frequency range. On the other hand, ferrite does not damp the lower frequencies used, for example, for the ignition spark of a sparkplug of an internal combustion engine.
  • the sparkplug which is shown in Fig. 1 includes a housing 10 which is insulated from the center electrode 12 of the sparkplug by the body 11 of ceramic insulating material.
  • the ignition spark jumps from the center electrode 12 to an electrode 13 which is a ground electrode and which is fixed to the housing 10.
  • a relatively small ferrite tube 14 is placed on a section of the center electrode 12 located within the insulating body 11, so that the electrode 12 passes through the tube 14.
  • This tube 14 may, for example, have a length of 15 mm., an inner diameter of 1.6 mm., and an outer diameter of 3.6 mm., and this arrangement provides a resistance of between 50 and 5000 ohms at frequencies which are greater than the ferromagnetic resonance frequency (greater than 1 megacycle).
  • a particular advantage of the present invention resides in the fact that the size of the ferrite tube does not necessitate basic changes in the form of the ignition assemblies into which it is incorporated.
  • the uses of the ferrite tube are, of course, not limited to the above described examples. It may be of advantage, for example, to place the ferrite tube on a high voltage conductor leading to or from a distributor in close proximity to the spark gap. Such an arrangement is of particular advantage when, for example, a sparkplug with a built in ferrite tube according to Fig. l or a distributor rotor with a ferrite tube according to Fig. 2 are not available.
  • Apparatus for suppressing ignition noise in wireless equipment comprising, in combination, an electrical source of interference; electrical conductors respectively leading to and from said source; and a ferrite tube of predetermined composition through which one of said conductors passes, said composition of said tube providing a real resistance at high frequencies through the cooperation of said tube with said conductor.
  • Apparatus for suppressing ignition noise in wireless equipment comprising, in combination, an electrical source of interference; electrical conductors respectively leading to and from said source; and a ferrite tube of predetermined composition through which one of said conductors passes, said composition of said tube providing a real resistance at relatively high frequencies through the cooperation of said tube with said conductor.
  • Apparatus for suppressing ignition noise in wireless equipment comprising, in combination, a spark plug having a center electrode; and a ferrite tube of predetermined composition through which said electrode extends said composition of said tube providing a real resistance at high frequencies through the cooperation of said tube with said electrode.
  • Apparatus for suppressing ignition noise in wireless equipment comprising, in combination, a distributor for an internal combustion engine, said distributor including a rotor having a contact member adapted to successively engage the distributor points and a high voltage conductor connected to said contact member; and a ferrite tube of predetermined composition located adjacent said contact member and through which said conductor passes said composition of said tube providing a real resistance at high frequencies through the cooperation of said tube with said conductor.
  • Apparatus for suppressing ignition noise in wireless equipment comprising, in combination, a distributor for an internal combustion engine, said distributor including a rotor having a contact member adapted to successively engage the distributor points and a high voltage conductor connected to said contact member; and a ferrite tube of predetermined composition located adjacent said contact member, said composition of said tube providing a real resistance at high frequencies through the cooperation of said tube with said conductor.
  • an ignition system having a high voltage conductor; at least a pair of electrically conductive portions which are spaced from each other at least part of the time during the operation of the engine and between which electricity is conducted at least part of the time during the operation of the engine, said electrically conductive portions being located adjacent said conductor; and a ferrite tube located in the vicinity of said electrically conductive portions and through which said conductor passes, said tube having a composition which provides a real resistance at high frequency by cooperation of said tube with said conductor.
  • a device as recited in claim 6 said pair of electrically conductive portions having a pair of spaced spark plug electrodes defining the spark gap between themselves.
  • one portion of said pair of electrically conductive portions being a stationary distributor point and the other electrically conductive portion being the movable point of the distributor.
  • Apparatus for suppressing radio noise comprising, in combination, a spark source of radio noise; an elongated conductor connected at one end to said spark source and conveying current when sparking occurs; and a tubular ferrite element through which said conductor extends at only a portion of said conductor which is adjacent to said end thereof.
  • Apparatus for suppressing propagation of radio noise from a spark source of radio noise comprising, in combination, an elongated conductor adapted to be connected at one end to the spark source and adapted to convey current during sparking of the spark source; and a tubular ferrite element through which said conductor extends at only a portion of the conductor which is adjacent to said end thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US629373A 1955-12-23 1956-12-19 Ignition noise suppressor Expired - Lifetime US2896120A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE344108X 1955-12-23

Publications (1)

Publication Number Publication Date
US2896120A true US2896120A (en) 1959-07-21

Family

ID=6249958

Family Applications (1)

Application Number Title Priority Date Filing Date
US629373A Expired - Lifetime US2896120A (en) 1955-12-23 1956-12-19 Ignition noise suppressor

Country Status (3)

Country Link
US (1) US2896120A (de)
CH (1) CH344108A (de)
GB (1) GB849268A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441797A (en) * 1967-02-09 1969-04-29 Ralph R Lewis Spark intensifier gap with a transformer coil around the cable
US3697804A (en) * 1970-10-12 1972-10-10 Litton Systems Inc Microwave generating apparatus including spurious signal suppression means
US3771006A (en) * 1972-02-14 1973-11-06 N Berry Ignition circuit radiation suppression structure
US3882341A (en) * 1974-01-24 1975-05-06 Champion Spark Plug Co Spark plug with inductive suppressor
US4078534A (en) * 1975-05-21 1978-03-14 Mayer Ferdy P Anti-interference device for internal combustion engines
US20070235012A1 (en) * 2005-04-04 2007-10-11 Lam Luk Mui J Ignition Apparatus
EP2945234A1 (de) * 2014-05-12 2015-11-18 NGK Spark Plug Co., Ltd. Zündkerze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6030475A (ja) * 1983-07-27 1985-02-16 Hitachi Ltd 内燃機関用配電器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197006A (en) * 1935-08-21 1940-04-16 Melville F Peters Thermal protection and radio shielding of spark plugs
US2745069A (en) * 1950-05-17 1956-05-08 Bell Telephone Labor Inc Microwave magnetized ferrite attenuator
US2798183A (en) * 1954-11-29 1957-07-02 Hughes Aircraft Co Traveling-wave tube
US2806972A (en) * 1954-12-08 1957-09-17 Hughes Aircraft Co Traveling-wave tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197006A (en) * 1935-08-21 1940-04-16 Melville F Peters Thermal protection and radio shielding of spark plugs
US2745069A (en) * 1950-05-17 1956-05-08 Bell Telephone Labor Inc Microwave magnetized ferrite attenuator
US2798183A (en) * 1954-11-29 1957-07-02 Hughes Aircraft Co Traveling-wave tube
US2806972A (en) * 1954-12-08 1957-09-17 Hughes Aircraft Co Traveling-wave tube

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441797A (en) * 1967-02-09 1969-04-29 Ralph R Lewis Spark intensifier gap with a transformer coil around the cable
US3697804A (en) * 1970-10-12 1972-10-10 Litton Systems Inc Microwave generating apparatus including spurious signal suppression means
US3771006A (en) * 1972-02-14 1973-11-06 N Berry Ignition circuit radiation suppression structure
US3882341A (en) * 1974-01-24 1975-05-06 Champion Spark Plug Co Spark plug with inductive suppressor
US4078534A (en) * 1975-05-21 1978-03-14 Mayer Ferdy P Anti-interference device for internal combustion engines
US20070235012A1 (en) * 2005-04-04 2007-10-11 Lam Luk Mui J Ignition Apparatus
US7665451B2 (en) * 2005-04-04 2010-02-23 Joe Luk Mui Lam Ignition apparatus
US20100108043A1 (en) * 2005-04-04 2010-05-06 Luk Mui Joe Lam Ignition apparatus
US7819109B2 (en) * 2005-04-04 2010-10-26 Lam Luk Mui Joe Ignition apparatus
EP2945234A1 (de) * 2014-05-12 2015-11-18 NGK Spark Plug Co., Ltd. Zündkerze
CN105098602A (zh) * 2014-05-12 2015-11-25 日本特殊陶业株式会社 火花塞
US9373940B2 (en) 2014-05-12 2016-06-21 Ngk Spark Plug Co., Ltd. Spark plug
CN105098602B (zh) * 2014-05-12 2017-09-19 日本特殊陶业株式会社 火花塞

Also Published As

Publication number Publication date
CH344108A (de) 1960-01-31
GB849268A (en) 1960-09-21

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