Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T13/00—Sparking plugs
  • H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber

Definitions

• Ignition device for reciprocating internal combustion engine.
• the invention relates to a reciprocating internal com ⁇ bustion engine comprising at least one combustion chamber and an ignition device, including a spark plug mounted in a screw ⁇ threaded hole in a wall of the combustion chamber such that electrodes of the spark plug are in communication with the in ⁇ terior of the combustion chamber.
• a combustable gas mixture is com ⁇ pressed and after compression ignited by a spark at the elec ⁇ trodes of the spark plug, which spark is generated by means of a high tension ignition coil of the ignition device.
• the ignition causes combustion of the gas mixture and the occur ⁇ ring high pressures are converted in mechanical power in a way known per se.
• the invention has for its object to provide an engine of the kind set forth above, in which with strongly differ ⁇ ring circumstances for the ignition device an optimal overall performance of the engine is obtained.
• a pre-chamber member in the screwthreaded hole a pre-chamber member is mounted, said member enclosing a pre- combustion chamber and comprising a wall section provided with at least one orifice with a smaller cross-section than the pre-chamber and forming a communication opening between the combustion chamber and the pre-chamber, said spark plug being connected with the pre-chamber member such that said elec ⁇ trodes are exposed in the pre-chamber.
• a pre-ignition takes place which produces a fire jet out of the orifice into the combustion chamber, which fire jet ignites the main combustion in the combustion chamber.
• the engine according to the invention is less sensitive for detonation, probably because the glowing spark plug electrodes are not directly exposed in the combustion chamber, such that fuels with lower octane numbers can be used.
• An existing internal combustion engine can be easily converted to an engine according to the invention, when the pre-chamber member is a substantially tube-formed member, at one end comprising the wall section with at least one orifice and at the opposite end a screwthreaded hole in which the spark plug is mounted, said member externally at the one end being provided with screwthread engaging in the , screwthreaded hole in the combustion chamber wall.
• the spark plug engaged in the pre-chamber member can be of a smaller type than origi ⁇ nally used for the respective engine.
• the invention relates to and provides furthermore a pre-chamber member to be used in an internal combustion engine according to the invention.
• the wall section is formed by an annular member being enclosed in a body of the pre-chamber member and dimensioned in such a way that with substantially equal temperatures of the annular member and the body, the former has a sliding fit in the latter.
• the pre-chamber member is formed integral with the spark plug.
• the existing spark plugs of a motor therefore, can - easily be replaces by a spark plug having a. pre-chamber mem ⁇ ber according to the invention.
• the wall section comprises a number of orifices, the axes of which diverge in ⁇ to the combustion chamber. In this way a number of fire jets are produced by the pre-combustion.
• Fig. 1 shows a partial cross-section of an internal combustion engine according to the invention.
• Fig. 2 is a cross-section showing a second embodiment of a pre-chamber member.
• Fig. 3 shows a third embodiment.
• Fig. 4 shows a fourth embodiment.
• Fi . 5 shows a cross-section according to V-V in Fig. 4.
• Fig. 1 the reference numeral 1 designates reci- procating internal combustion engine.
• This engine 1 comprises a cylinder 2 in which a piston 3 reciprocates in a known manner by means of a crank mechanism.
• a combustion chamber 4 In the upper part of the cylinder 2 a combustion chamber 4 is defined.
• a screwthreaded hole 6 In the wall 5 of this combustion chamber 4 a screwthreaded hole 6 is pro ⁇ vided. This screwthreaded hole can be the hole in which nor ⁇ mally a spark plug is engaged.
• a pre-chamber member 8 is mounted in the screwthreaded hole 6 .
• This member 8 encloses a pre-combustion chamber 10 and a wall section 12 in which a orifice 11 is provided with a smaller cross-section than the cross-section of the pre-chamber 10.
• the pre-chamber member 8 is substantially tube-formed and has at the end opposite to the orifice 11 a screwthreaded hole 13 in which a spark plug 7 is engaged.
• This spark plug 7 can be of a smaller type than normally used for an engine of the present kind, so that the pre-chamber member 8 together with the spark plug 7 can be replaced for an existing spark plug of a bigger type.
• the spark plug 7 is mounted in such a way in the pre- - chamber member 8, that its electrodes 9 are exposed in the pre-combustion chamber 10.
• Fig. 1 the piston 3 is shown at the end of the com- pression stroke, in which combustable gas mixture is com ⁇ pressed in the combustion chamber 4.
• this compression also some of the gas mixture is flown through the orifice 11 in the pre-chamber 10.
• a spark is produced at the electrodes 9, which spark ignites the gas mixture in the pre-chamber 10 and, therefore, causes combustion thereof.
• the pressure in the pre-chamber 10 rises rapidly, causing a part of the burning gasses to be ex ⁇ pelled.through the orifice 11 into the combustion chamber 4.
• This fire jet which is much more powerful than a normal spark of a spark plug very thoroughly and reliably ignites the compressed gasses in the combustion chamber 4.
• the combustion of these gasses takes also place very thoroughly.
• Fig. 2 shows a second embodiment of a pre-chamber mem- ber 15.
• This pre-chamber member 15 also comprises a pre- chamber 16.
• the wall section of the pre-chamber member 15 is formed by an annular member 17 which is enclosed in the body of the member 15. With substantially equal temperatures of the body and the annular member, this annular member has a sliding fit in the body.
• the pre-combustion caused by the spark plug 19 in the pre-combustion chamber 16 and the fire jet through the ori- fice 18 very rapidly heats up the annular member 17, as the heat transfer from the annular member 17 to the surrounding body of the pre-chamber member 15 is poor, as a consequence of the sliding fit. Therefore, in the pre-chamber 16 very rapidly favourable operating conditions are formed.
• the spark plug and pre-chamber member are formed integral ⁇ ly.
• the pre-chamber 26 is formed in a lower part of the spark plug 20.
• the central electrode which is surrounded by isola ⁇ tion material 25 in a way known as such, does not extend out of the spark plug but ends inside the plug.
• the mass electrodes are formed by side electrodes 22.
• the wall section 23 is formed as an annular member, which is mounted to the body of the spark plug 20 by means of a cir- clip 24.
• the pre-chamber member 30 of Fig. 4 mainly corresponds to the pre-chamber member 8 of Fig. 1.
• the member 30, however, comprises a wall section 31 which has nine orifices 32 having axes which diverge outwardly. With this embodiment a number of fire jets is formed.

Landscapes

• Combustion Methods Of Internal-Combustion Engines (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Spark Plugs (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19842645

Family Applications (1)

Country Status (10)

Cited By (5)

Families Citing this family (2)

Citations (4)

• 1983
  • 1983-11-01 NL NL8303762A patent/NL8303762A/nl not_active Application Discontinuation
• 1984
  • 1984-10-31 IT IT12630/84A patent/IT1180839B/it active
  • 1984-11-01 EP EP84904000A patent/EP0162066A1/en not_active Ceased
  • 1984-11-01 AU AU35599/84A patent/AU577808B2/en not_active Ceased
  • 1984-11-01 JP JP59504036A patent/JPS61500288A/ja active Pending
  • 1984-11-01 BR BR8407146A patent/BR8407146A/pt not_active IP Right Cessation
  • 1984-11-01 WO PCT/NL1984/000039 patent/WO1985002066A1/en not_active Application Discontinuation
• 1985
  • 1985-06-20 FI FI852450A patent/FI852450L/fi not_active Application Discontinuation
  • 1985-06-25 DK DK288285A patent/DK288285A/da not_active Application Discontinuation
  • 1985-06-26 NO NO852577A patent/NO852577L/no unknown

Patent Citations (4)

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