US3597648A - Combination of spark plug and combustion chamber having connected conical and cylindrical sections - Google Patents

Combination of spark plug and combustion chamber having connected conical and cylindrical sections Download PDF

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Publication number
US3597648A
US3597648A US3597648DA US3597648A US 3597648 A US3597648 A US 3597648A US 3597648D A US3597648D A US 3597648DA US 3597648 A US3597648 A US 3597648A
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US
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Grant
Patent type
Prior art keywords
lower end
shell
spark plug
combustion chamber
ignition opening
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
Inventor
Masao Shibagaki
Ikuo Ogasawara
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.)
NGK Spark Plug Co Ltd
Toyo Kogyo Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Toyo Kogyo Co Ltd
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
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00Sparking plugs
    • H01T13/54Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/12Ignition
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00Engines characterised by fuel-air mixture compression
    • F02B1/02Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B2053/005Wankel engines
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/17Non-reciprocating piston engines, e.g. rotating motors

Abstract

A spark plug for use in a rotary engine, having an outer electrode projected from the lower end surface of the metal shell of the spark plug along and spaced apart from an inverted conical surface of an ignition opening of the rotary engine to locate a spark discharge gap near a combustion chamber.

Description

United States Patent 1111 3,597,648

721 Inventors Masao Shibagaki 511 Int. (:1 .1101: 13/54, Asa-gun: H011 13/20, F02b 53/00 lkuo Ogasawara, Nagoya, both of, Japan [50] Field of Search 313/143 [2i] Appl. No 686,166 [22] Filed Nov. 28, 1967 References Cited 45 Patented Aug. 3, 1971 UNITED STATES PATENTS 1 Assignees 10 2,238,852 4/1941 Regar 313 143 x AH'GIIII; 2,391,456 12/1945 Hensel 313/143 x NGK Spark Plug 2,586,864 2/1952 Rose 313/143 x ti ne 2,591,718 4/1952 Paul 313/143 x 1 1 Priority 099-1, 1966 2,616,407 11/1952 Thomas 313/143 x 1 J p (31 1 41/109731 Przmary Exammer- Robert Segal 3 Attorney-Waters, Roditi, Schwartz & Nissen [54] COMBINATION OF SPARK PLUG AND ABSTRACT: A spark plug for use in a rotary engine, having ggfiggg an outer electrode projected from the lower end surface of the 2 Cl s 3 D "in 5 metal shell of the spark plug along and spaced apart from an n g inverted conical surface of an ignition opening of the rotary [52] [LS-Cl 313/143, engine to locate a spark discharge gap near a combustion 313/141, l23/8.49, 123/809 chamber.

PATENTEI] Am; 3 Ian COMDINATION OF SPARK PLUG AND COMBUSTION CHAMBER HAVING CONNECTED CONICAL AND CYLINDRICAL SECTIONS The present invention relates to a spark plug for use in a retary engine.

The spark plug of the rotary engine is detachably mounted in the innermost part of an ignition opening of the rotary engine from the outside. This'ignition opening is circular in secdischarge gap G.

tion and formed in that part of a casing of the rotary engine which serves to compress and ignite a mixed gas by means of a rotor, said casing constituting a combustion chamber therein for the rotary engine.

The ignition opening is designed so that its diameter is made as small as possible so as to prevent a draft of the mixed gas from occurring owing to the pressure difference between adjacent combustion chambers divided by the rotor and that that part of the ignition opening which surrounds the spark discharge electrodes of the spark plug is formed as an inverted conical-shaped funnel for the purpose of facilitating a supply of the mixed gas to the spark gap and also of improving machinability of the ignition opening.

It is desired to locate the spark discharge electrodes as near the combustion chamber as possible so as to improve the thermal property of the spark plug.

In the heretofore known spark plug an outer electrode is mounted on the lower end surface of the metal shell of the spark plug in parallel with a center axis of the shell or perpendicular to the lower end surface of the shell and the free end of the outer electrode is bent at substantially 90 in opposition to a center electrode so as to fonn a spark discharge gap therebetween. This construction causes the bent portion of the outer electrode to make contact with the conical surface formed at the innermost part of the ignition opening. Thus, it is impossible to locate the spark discharge gap as near the combustionchamber as possible and hence a satisfactory thermal property of the ignition plug could not be obtained.

The principal object of the invention, therefore, is to provide an improved spark plug for use in a rotary engine, which is particularly adapted to locate its spark discharge gap as near the combustion chamber as possible and hence to obtain a satisfactorythermal property.

For a better understanding of the invention, reference is made to the accompanying drawing, in which FIG. 1 is a front view of a spark plug partially broken away for use in a rotary engine according to the invention;

FIG. 2 is a longitudinal sectional view of essential parts of the elements of FIG. 1; and

FIG. 3 is a longitudinal sectional view of an rotary engine showing the spark plug according to the invention in the mounted state. I

Referring to the drawing, 1 designates a metal shell of a spark plug; 2 a ceramic insulator housed in the shell; 3 a center electrode extending through the ceramic insulator 2 and provided at its upper end with a terminal 3a; 4 an outer In accordance with the invention, the outer electrode 4 is mounted at the lower end of the shell 1 so that the outer electrode 4 is projected from the lower end surface 10 of the shell 1 along and spaced apart from an inverted conical surface 5 formed at the upper end of an ignition opening 6 of the rotary engine, the ignition opening 6 being formed in a casing 7 of the rotary engine and in communication with a combustion chamber 8 in which a rotor 9 is rotatably mounted.

As explained hereinbefore, the spark plug for use in the rotary engine according to the invention and comprising the outer electrode mounted on the shell so that the outer electrode is projected along and spaced apart from the conical surface forming the upper end of the ignition opening of the rotary engine so as to minimize the distance from the lower end of the outer electrode to the combustion chamber ensures location of the outer electrode as closely adjacent to the upper conical surface of the ignition opening as possible without requiring any troublesome operation and further provides the important advantage that the spark discharge gap is closely located near the combustion chamber and hence improves the thermal property of the spark plug.

Though the invention is described by means of an embodimentas shown in the drawing, yet various modifications can of course be made without departing from the scope of the claim.

What we claim is:

I. For a rotary engine, the combination of a casing having an ignition opening extending to a combustion chamber which is formed in the casing, and a spark plug in said ignition opening, said spark plug including a shell detachably mounted in said ignition opening and having a lower end, an insulated center electrode mounted in said shell, and an outer electrode mounted at said lower end of the shell and projecting into spaced relation with said center electrode to form a spark discharge gap therewith, said ignition opening having a conical surface which narrows in a direction away from said lower end and towards said combustion chamber, said ignition opening having a cylindrical portion extending from said conical surface into said combustion chamber in substantial axial alignment with said center electrode said lower end of the shell being of slightly reduced diameter compared to the remainder of the shell to form a space with said casing which extends into the ignition opening at said conical surface said outer electrode including a portion extending from said lower end substantially parallel to said conical surface in closely spaced relation therewith, the latter portion projecting towards said center electrode.

2. The combination as claimed in claim 1 wherein said outer electrode includes a bent portion extending perpendicular to the axis of said center electrode from the first said portion beneath and irito opposition to the lower end face of said center electrode.

Claims (2)

1. For a rotary engine, the combination of a casing having an ignition opening extending to a combustion chamber which is formed in the casing, and a spark plug in said ignition opening, said spark plug including a shell detachably mounted in said ignition opening and having a lower end, an insulated center electrode mounted in said shell, and an outer electrode mounted at said lower end of the shell and projecting into spaced relation with said center electrode to form a spark discharge gap therewith, said ignition opening having a conical surface which narrows in a direction away from said lower end and towards said combustion chamber, said ignition opening having a cylindrical portion extending from said conical surface into said combustion chamber in substantial axial alignment with said center electrode said lower end of the shell being of slightly reduced diameter compared to the remainder of the shell to form a space with said casing which extends into the ignition opening at said conical surface said outer electrode including a portion extending from said lower end substantially parallel to said conical surface in closely spaced relation therewith, the latter portion projecting towards said center electrode.
2. The combination as claimed in claim 1 wherein said outer electrode includes a bent portion extending perpendicular to the axis of said center electrode from the first said portion beneath and into opposition to the lower end face of said center electrode.
US3597648A 1966-12-02 1967-11-28 Combination of spark plug and combustion chamber having connected conical and cylindrical sections Expired - Lifetime US3597648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10973166 1966-12-02

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US3597648A true US3597648A (en) 1971-08-03

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US3597648A Expired - Lifetime US3597648A (en) 1966-12-02 1967-11-28 Combination of spark plug and combustion chamber having connected conical and cylindrical sections

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DE (2) DE6609506U (en)
GB (1) GB1152608A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738331A (en) * 1970-04-24 1973-06-12 Daimler Benz Ag Rotary piston internal combustion engine with externally controlled ignition by means of a spark plug
US3800179A (en) * 1972-10-02 1974-03-26 Gen Motors Corp Self-cleaning spark plug
US3941097A (en) * 1973-06-09 1976-03-02 Audi Nsu Auto Union Aktiengesellschaft Rotary combustion engine having improved ignition means
US5373214A (en) * 1992-06-12 1994-12-13 Mccready; David F. Spark plug and electrode arrangement therefor
US20060081534A1 (en) * 2004-10-14 2006-04-20 Dimitriou Michael A Energy-efficient biological treatment with membrane filtration

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238852A (en) * 1939-07-08 1941-04-15 Harold D Regar Spark plug
US2391456A (en) * 1944-01-29 1945-12-25 Mallory & Co Inc P R Spark plug electrode
US2586864A (en) * 1950-08-22 1952-02-26 John J Rose Spark plug electrode
US2591718A (en) * 1950-01-16 1952-04-08 Edwin R Paul Spark plug
US2616407A (en) * 1949-10-22 1952-11-04 Vernon R Thomas Spark plug

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238852A (en) * 1939-07-08 1941-04-15 Harold D Regar Spark plug
US2391456A (en) * 1944-01-29 1945-12-25 Mallory & Co Inc P R Spark plug electrode
US2616407A (en) * 1949-10-22 1952-11-04 Vernon R Thomas Spark plug
US2591718A (en) * 1950-01-16 1952-04-08 Edwin R Paul Spark plug
US2586864A (en) * 1950-08-22 1952-02-26 John J Rose Spark plug electrode

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738331A (en) * 1970-04-24 1973-06-12 Daimler Benz Ag Rotary piston internal combustion engine with externally controlled ignition by means of a spark plug
US3800179A (en) * 1972-10-02 1974-03-26 Gen Motors Corp Self-cleaning spark plug
US3941097A (en) * 1973-06-09 1976-03-02 Audi Nsu Auto Union Aktiengesellschaft Rotary combustion engine having improved ignition means
US5373214A (en) * 1992-06-12 1994-12-13 Mccready; David F. Spark plug and electrode arrangement therefor
US20060081534A1 (en) * 2004-10-14 2006-04-20 Dimitriou Michael A Energy-efficient biological treatment with membrane filtration
US20060213831A1 (en) * 2004-10-14 2006-09-28 Dimitriou Michael A Energy-efficient biological treatment system with filtration membrane

Also Published As

Publication number Publication date Type
GB1152608A (en) 1969-05-21 application
DE1576688A1 (en) 1970-06-04 application
DE6609506U (en) 1972-06-08 grant

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