JP7267693B2 - Pre-chamber device and method for manufacturing said pre-chamber device - Google Patents

Description

The present invention relates to a pre-chamber device.

A pre-chamber device for a cylinder of an internal combustion engine is known from US Pat. The pre-chamber device disclosed in US Pat. The body section serves to secure the pre-chamber device to the cylinder head of the cylinder of the internal combustion engine. A nozzle section is connected to the body section and has a nozzle orifice, and a precombustion chamber of the precombustion chamber defined by the body section and the nozzle section is connected to the main chamber combustion chamber via the nozzle orifice. . This section of the pre-chamber device is completely provided by the nozzle section, which protrudes into the main chamber combustion chamber by means of the nozzle section. The body section and nozzle section are connected to each other via at least one lock.

EP 220548

What is needed is a prechamber device that is less susceptible to wear. Starting from here, the invention is based on the task of creating a new type of prechamber device.

This problem is solved by a pre-chamber device according to claim 1 . According to the invention, the body section is permanently connected to the nozzle section and projects beyond the cylinder head into the main chamber combustion chamber so that the pre-combustion chamber and the main chamber combustion chamber are in the pre-chamber arrangement. In the region of the sections projecting into the main combustion chamber, they are separated from one another by a body section on the one hand and a nozzle section on the other hand. This provides the pre-chamber device less susceptible to wear.

According to an advantageous first further development of the invention, on the side of the section of the pre-chamber device projecting into the main chamber combustion chamber facing the main chamber combustion chamber , the pre-chamber device has a nozzle section in the region of the nozzle orifice. defined or defined by a body section between adjacent nozzle orifices and between the nozzle orifices and the cylinder head. Due to this, the susceptibility to wear of the pre-chamber device is reduced on the side of the section of the pre-chamber device that projects into the main chamber combustion chamber, facing the main chamber combustion chamber.

According to a further development of the invention, the pre-chamber arrangement is defined or bounded only by the nozzle section on the side of the section of the pre-chamber arrangement which projects into the main combustion chamber and which faces the pre-combustion chamber. Due to this, a reduced susceptibility to wear in the pre-chamber device is provided on the side facing the pre-combustion chamber.

According to a further development of the invention, the pre-chamber device is configured such that, on the side facing the pre-combustion chamber, of the region of the section of the pre-chamber device that projects into the main chamber combustion chamber, on the one hand partly by the body section and on the other hand. is defined or defined in part by the nozzle section. These features also serve to reduce the wear susceptibility of the pre-chamber device on the side facing the pre-combustion chamber.

A method for manufacturing a prechamber device according to the invention is defined in claim 9 .

Preferred further developments of the invention result from the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail with the aid of the drawings without being restricted thereto.

1 is a schematic cross-sectional view of a pre-chamber device according to the present invention; FIG.

The present invention relates to a pre-chamber device for a cylinder of an internal combustion engine.

FIG. 1 shows a schematic sectional view of a pre-chamber device 1 according to the invention for a cylinder of an internal combustion engine, the pre-chamber device 1 being fastened to the cylinder head 2 of the cylinder.

The prechamber device 1 comprises a body section 3 and a nozzle section 4 . The body section 3 secures the prechamber device 1 to the cylinder head 2 of the cylinder.

The nozzle section 4 and the body section 3 cooperate to define a precombustion chamber 5 which is connected via a nozzle orifice 7 to a main combustion chamber 6 of the cylinder, the nozzles An orifice 7 is provided by the nozzle section 4 of the prechamber device 1 .

When the pre-chamber device 1 is attached to the cylinder head 2 , the section 8 of the pre-chamber device 1 protrudes beyond the cylinder head 2 into the main combustion chamber 6 . A further section 9 of the prechamber device 1 does not project into the main chamber combustion chamber 6 of the cylinder 2 .

Body section 3 and nozzle section 4 are directly and non-detachably connected to each other. The body section 3, together with the nozzle section 4, projects beyond the cylinder head 2 into the main chamber combustion chamber 6 of the cylinder, i. The body section 3 together with the nozzle section 4 extends beyond the cylinder head 2 such that in the region of the section 8 projecting into the chamber 6 it is separated from each other by the body section 3 on the one hand and the nozzle section 4 on the other hand. It protrudes into the main chamber combustion chamber 6 of. Due to this, a separation area between the pre-chamber combustion chamber 5 and the main chamber combustion chamber 6 can be provided on the pre-chamber device 1, which is not particularly susceptible to wear. Body section 3 is preferentially manufactured from a metallic material. The nozzle section 4 is made from a material that is highly resistant to wear loads, for example another metallic material that is highly corrosion resistant or from a ceramic material.

On the side 10 facing the main combustion chamber 6 of the section 8 of the precombustion device 1 projecting into the main combustion chamber 6 , the precombustion device 1 is defined or bounded by the nozzle section 4 in the region of the nozzle orifice 7 . , between adjacent nozzle orifices 7 and between the nozzle orifices 7 and the cylinder head 2 are defined or delimited by the body sections 3 and thus project into the main chamber combustion chamber 6 in the pre-chamber arrangement 1 as a result. On the side 10 of the section 8 facing the main chamber combustion chamber 6, the pre-chamber device 1 has different material properties.

On the side 12 facing the precombustion chamber 5 of the section 8 of the precombustion device 1 projecting into the main combustion chamber 6, the precombustion device 1 is defined or bounded only by the nozzle section. Furthermore, the precombustion device 1 is provided on the side 11 facing the precombustion chamber 5 of the region of the section 9 of the precombustion device 1 which does not project into the main combustion chamber 6, on the one hand partly by the nozzle section 4 and On the other hand it is partially defined by the body section 3 .

As already explained, the body section 3 and the nozzle section 4 are permanently connected to each other. Furthermore, the body section 3 and the nozzle section 4 are directly connected to each other, i.e. directly connected without further fixing means.

According to an advantageous further development of the invention, the body section 3, in the region of the section 8 of the precombustion device 1 projecting into the main chamber combustion chamber 6, on the side 10 facing the main chamber combustion chamber 6 and/or Alternatively, the region of the section 9 of the precombustion device 1 that does not project into the main combustion chamber 6 has corrosion protection and/or thermal insulation protection on the side facing the precombustion chamber 5 .

In particular, the corrosion protection is in this embodiment formed by a surface treatment of the body section 3, during which surface treatment the base material of the body section 3 undergoes formation of a corresponding protective layer, for example nitriding, carburizing, oxidizing or It undergoes adhesion with another material used during surface treatment through alitizing.

Preferentially, the corrosion protection is formed in this embodiment by a diffusion surface treatment method. With such a diffusion method, the diffusion material, which may be, for example, a metal diffusion material, is diffused into the metal base material of the body section 3 .

Contact between the diffusion material and the surface of the body section 3 to be treated is provided in this embodiment via, for example, a liquid or paste dispersion or suspension. Similarly, the diffusion material can be provided as a powder or in a gaseous state.

According to a particularly advantageous further development, the body section 3 and/or the nozzle section 4 have a side 10 facing the main combustion chamber 6 in the region of the section 8 projecting into the main combustion chamber 6 and a and in the region of the side 11 facing the precombustion chamber 5 in the region of the section 9 that does not project into the combustion chamber 6, each having a corrosion protection for the diffusion protection layer; On the side 10 facing the main chamber combustion chamber 6 in the region of the protruding section 8, a thermal insulation layer is applied to the corrosion protection layer, thus further reducing the susceptibility to wear of the pre-chamber device 1. What you can do is provided.

To manufacture the prechamber device 1 according to the invention, the nozzle section 4 and the body section 3 are manufactured, during manufacture the body section 3 and the nozzle section 4 are directly and irremovably connected to each other, so that No separate fixing means are required to fix the nozzle section 4 to the body section 3 .

The nozzle section 4 is preferentially manufactured by a generative manufacturing method. During a generative manufacturing process, a powder of material is prepared for the nozzle section 4, which is subjected to, for example, selective laser sintering, selective laser melting, electron beam melting, laser vapor deposition welding, binder injection, Step by step from this powder is formed through 3D printing or the like. As powder material for the nozzle section 4 powder mixtures of different materials are preferentially used, for example mixtures of metal powders and metal alloy powders or mixtures of metal powders and non-metallic, especially ceramic powders.

Metal powders contain, for example, iron and/or nickel and/or cobalt and/or titanium and/or copper and/or chromium and/or zirconium and/or yttrium and/or boron.

Non-metallic powders include oxides, nitrides, carbides, silicides and/or borides.

The body section 3 can be manufactured via a composite casting method, such as composite casting around the nozzle section 4 , i.e. the body section 3 can be manufactured such that it partially surrounds the nozzle section 4 .

Alternatively, both the nozzle section 4 and the body section 3 can be manufactured via generative manufacturing methods, ie via suitably matched powder materials, with the body section 3 partially surrounding the nozzle section 4 .

In order to provide corrosion protection and/or thermal insulation protection, at least the body section 3 or the body section 3 and/or the nozzle section 4 are surface-treated, in particular via diffusion methods, as already described above.

The prechamber device 1 according to the invention is not susceptible to wear. Longer life and thus lower operating and maintenance costs are realized.

Preferentially, the pre-chamber device 1 is a pre-chamber device for a gas engine, in which the ignition device is arranged in the pre-combustion chamber 5 .

1 pre-chamber device 2 cylinder head 3 body section 4 nozzle section 5 pre-combustion chamber 6 main combustion chamber 7 nozzle orifice 8 section 9 section 10 surface 11 surface 12 surface

Claims (11)

A pre-chamber device (1) for a cylinder of an internal combustion engine, comprising:
a body section (3) for fixing said pre-chamber device (1) to a cylinder head (2) of a cylinder of said internal combustion engine;
a nozzle section (4) coupled to said body section (3) and comprising a nozzle orifice (7), said subchamber of said cylinder defined by said body section (3) and said nozzle section (4); a nozzle section (4) in which the precombustion chamber (5) of the device (1) is connected to the main combustion chamber (6) of the cylinder through the nozzle orifice (7);
In the pre-chamber device (1) having
Said body section (3) is irremovably connected to said nozzle section (4) and projects beyond said cylinder head (2) into said main combustion chamber (6), so that said precombustion The body section (3 ) and on the other hand by said nozzle section (4) ,
On the side (10) facing the main chamber combustion chamber (6) of the section (8) of the pre-chamber device (1) protruding into the main chamber combustion chamber (6), the pre-chamber device (1 ) are defined or defined by said nozzle section (4) in the region of said nozzle orifices (7), between adjacent nozzle orifices (7) and between said nozzle orifices (7) and said cylinder head (2). A prechamber device (1) characterized in that it is defined or defined by said body section (3) therebetween . 2. Prechamber device according to claim 1, characterized in that the body section (3) consists of a metallic material and the nozzle section (4) consists of another material highly resistant to abrasion loads. 1). The body section (3) protrudes into the main combustion chamber (6) of the prechamber device (1) on the side of the region of the section (8) facing the main combustion chamber (6). 3. The prechamber device (1) according to claim 1 or 2, characterized in that in 10) it comprises corrosion protection and/or thermal insulation protection. On the side (12) facing the precombustion chamber (5) of the section (8) of the precombustion device (1) protruding into the main combustion chamber (6), the precombustion device (1 ) is defined or defined only by the nozzle section ( 4 ). The side ( 11) is defined or defined partly by said body section (3) on the one hand and partly by said nozzle section ( 4 ) on the other hand. An auxiliary chamber device (1) according to 1. said precombustion in areas of said section (9) where said body section (3) and/or said nozzle section (4) do not protrude into said main chamber combustion chamber (6) in said precombustion device (1); 6. Ancillary device (1) according to claim 5 , characterized in that on the side (11) facing the chamber (5) it is provided with corrosion protection and/or thermal insulation protection. 7. Pre-chamber device (1) according to claim 3 or 6 , characterized in that the corrosion protection and/or the thermal insulation protection is designed as a diffusion protection layer. A method for manufacturing a pre-chamber device according to any one of claims 1 to 7 ,
manufacturing said nozzle section (4);
manufacturing said body section (3) with the nozzle section (4) and body section (3) non-detachably joined;
A method comprising: 9. Method according to claim 8 , characterized in that said nozzle section (4) and said body section (3) are each manufactured from a powder material . 9. Method according to claim 8 , characterized in that the nozzle section (4) is produced from a powder material and the body section (3) is produced as a composite casting around the nozzle section (4). . 11. Method according to any one of claims 8 to 10 , characterized in that the body section (3) is surface treated to form a corrosion protection and/or a thermal insulation protection.

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