Spark-ignited reciprocating piston internal combustion engine comprising a pre-chamber ignition system

Abstract

A spark-ignited reciprocating piston internal combustion engine includes a pre-chamber ignition system with a housing which is installed in a cylinder head of the spark-ignited reciprocating piston internal combustion engine. An ignition apparatus is disposed in the pre-chamber ignition system and the ignition apparatus protrudes into a cavity in the housing. The cavity is covered by a cover with respect to a combustion chamber of the spark-ignited reciprocating piston internal combustion engine and the cover has at least one aperture which connects the cavity and the combustion chamber to one another in a gas-conducting manner. The housing has a volume and the at least one aperture has a jet cross section and a ratio of the volume to the jet cross section is greater than 100 and less than 300.

Claims

1. A spark-ignited reciprocating piston internal combustion engine, comprising: a pre-chamber ignition system with a housing which is installed in a cylinder head of the spark-ignited reciprocating piston internal combustion engine, wherein an ignition apparatus is disposed in the pre-chamber ignition system and wherein the ignition apparatus protrudes into a cavity in the housing; wherein the cavity is covered by a cover with respect to a combustion chamber of the spark-ignited reciprocating piston internal combustion engine, wherein the cover has apertures which connect the cavity and the combustion chamber to one another in a gas-conducting manner, and wherein a respective combustion jet is penetrable into the combustion chamber through all of the apertures of the cover; wherein a ratio of a volume of the housing to a jet cross section of all of the apertures is greater than 100 and less than 300.

2. The spark-ignited reciprocating piston internal combustion engine according to claim 1, wherein the ratio is greater than 150 and less than 220.

3. The spark-ignited reciprocating piston internal combustion engine according to claim 1, wherein the cover has 3 apertures.

4. The spark-ignited reciprocating piston internal combustion engine according to claim 1, wherein the cover has 8 apertures.

5. The spark-ignited reciprocating piston internal combustion engine according to claim 1, wherein each of the apertures has a diameter of 1.3 mm.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The FIGURE shows a section through a pre-chamber ignition system.

DETAILED DESCRIPTION OF THE DRAWING

(2) The FIGURE shows a section through a pre-chamber ignition system 1 for a spark-ignited reciprocating piston internal combustion engine with a housing 2 which, in this exemplary embodiment, is formed radially on the outside by a cylinder head material of a cylinder head 3 of the reciprocating piston internal combustion engine. An ignition apparatus 4 is arranged in the pre-chamber ignition system 1, which ignition apparatus 4 protrudes into a cavity 5 in the housing 2. A spark plug, a corona ignition system or some other ignition apparatus for spark-ignited internal combustion engines can be provided as ignition apparatus, for example.

(3) Furthermore, the cavity 5 is covered with respect to a combustion chamber 6 of the reciprocating piston internal combustion engine by a cover 7 on the side which faces away from the ignition apparatus 4. The cover 7 has at least one first aperture 8 which connects the cavity 5 and the combustion chamber 6 to one another in a gas-conducting manner. Two apertures 8 can be seen in the present exemplary embodiment. These apertures 8 can be, for example, bores in the cover 7. The cover 7 can itself be connected to the cylinder head 3 in an integrally joined and/or positively locking manner.

(4) Furthermore, a fuel injector 9 can be seen in the FIGURE, by way of which fuel injector 9 fuel can be introduced into the combustion chamber 6 of the reciprocating piston internal combustion engine in order to produce a combustible fuel/air mixture in the combustion chamber 6.

(5) According to the invention, the housing 2 or the cavity 5 has a volume and the at least one aperture 8 has a jet cross section, the ratio of volume to jet cross section being greater than 100 and less than 300, in particular being greater than 150 and less than 220. In a preferred way, the aperture 8 is formed by at least three individual apertures.

EXAMPLE

(6) A cavity 5 of a pre-chamber ignition system 1 has, for example, a volume V of 1848 mm.sup.3, and is provided with eight apertures 8 in the form of bores with a diameter D of in each case 1.3 mm.

(7) The calculation is as follows:

(8) $\begin{array}{c}\mathrm{Ratio}=V\left[{\mathrm{mm}}^3\right]/\left(D^2*\mathrm{pi}/4\right)\left[{\mathrm{mm}}^2\right]*\mathrm{number}\mathrm{of}\mathrm{apertures}\\ =1848\left[{\mathrm{mm}}^3\right]/\left(1.3^2*3.14/4\right)\left[{\mathrm{mm}}^2\right]*8\\ =1848\left[{\mathrm{mm}}^3\right]/10.6\left[{\mathrm{mm}}^2\right]\\ =174.3\left[\mathrm{mm}\right]\end{array}$

(9) Finally, it is still to be mentioned that the configuration according to the invention of the pre-chamber ignition system 1 can be used both for passive pre-chamber ignition systems (as shown here) and for active pre-chamber ignition systems, with a dedicated introduction of fuel into the cavity 5.

(10) In a further exemplary embodiment, instead of being formed from the cylinder head material, the housing 2 can also be provided as a separate housing 2 which is introduced into the cylinder head 3.

LIST OF REFERENCE CHARACTERS

(11) 1 Pre-chamber ignition system 2 Housing 3 Cylinder head 4 Ignition apparatus 5 Cavity 6 Combustion chamber 7 Cover 8 Aperture 9 Fuel injector