Internal combustion engine
By introducing a sub-chamber structure into the internal combustion engine and using the torch flame injected from the nozzle to ignite the fuel, the problem of changing the fuel injection valve specifications was solved, and combustion efficiency was improved and emissions were reduced.
Patent Information
- Application Number
- CN202480008185.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-01-20
- Filing Date
- 2024-01-16
- Publication Date
- 2025-09-05
AI Technical Summary
When existing internal combustion engines use spark plugs to ignite fuel gases with a high reaction speed, such as hydrogen, it is difficult to flexibly adapt the specifications of the fuel injection valve, especially when there are many fuel injection holes or the space is narrow.
The auxiliary chamber structure is adopted. By setting a secondary chamber in the main combustion chamber, the torch flame sprayed from the nozzle is used to ignite the fuel injected from the fuel injection valve. The secondary chamber is set adjacent to the main combustion chamber, and the number and position of the nozzles are flexibly designed to ensure uniform dispersion of the fuel and efficient ignition.
The flexibility of changing the fuel injection valve specifications is achieved, the combustion efficiency and the uniform dispersion of the fuel are improved, the carbon dioxide emissions are reduced, and the nitrogen oxides generation is reduced.
Smart Images
Figure CN120604023A_ABST
Abstract
Description
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims the benefit of Japanese Patent Application No. 2023-007603, filed on January 20, 2023, which is hereby incorporated by reference in its entirety into this application. Technical Field
[0003] The present disclosure relates to a sub-chamber type internal combustion engine. Background Art
[0004] Conventionally, it is known that when a fuel gas with a high reaction rate, such as hydrogen, is used as the main fuel for an internal combustion engine, diffusion combustion is suitable as a combustion method from the perspectives of efficiency and nitrogen oxide emissions. To achieve diffusion combustion, for example, in Patent Document 1, fuel gas injected from a fuel injection valve for diffusion combustion is ignited by a spark plug.
[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2007-198275
[0006] However, when using a spark plug for ignition, the spark plug must be placed near the fuel injection valve, and one spark plug is required for each fuel injection hole. Therefore, it is difficult to flexibly respond to changes in fuel injection valve specifications, such as when multiple fuel injection holes are provided in the fuel injection valve as the internal combustion engine becomes larger, or when the fuel injection valve is installed in a narrow space. Summary of the Invention
[0007] Therefore, in order to solve the above-mentioned problems, an object of the present disclosure is to provide a structure that can easily and flexibly cope with specification changes of a fuel injection valve in an internal combustion engine capable of achieving diffusive combustion.
[0008] In order to solve the above-mentioned problems, the internal combustion engine according to the present disclosure includes:
[0009] The cylinder, which forms the main combustion chamber inside;
[0010] a piston reciprocating in the above-mentioned cylinder;
[0011] a fuel injection valve for injecting fuel into the main combustion chamber; and
[0012] The sub-chamber is provided adjacent to the main combustion chamber and is configured to ignite the fuel injected from the fuel injection valve by the torch flame injected through the injection hole in the main combustion chamber.
[0013] According to the internal combustion engine according to the present disclosure, it is easy to flexibly cope with specification changes of the fuel injection valve for the internal combustion engine capable of realizing diffusive combustion.
[0014] Furthermore, any combination of at least two constituent elements disclosed in the claims and / or the specification and / or the drawings is encompassed by the present disclosure. In particular, any combination of two or more claims in the claims is encompassed by the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present disclosure will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and the accompanying drawings are for illustration and explanation purposes only and are not intended to limit the scope of the present disclosure. The scope of the present disclosure is defined by the appended claims. In the accompanying drawings, identical component reference numerals in multiple figures represent identical parts.
[0016] Figure 1 It is a longitudinal sectional view schematically showing the general structure of an internal combustion engine according to one embodiment of the present disclosure.
[0017] Figure 2 It is schematically represented in Figure 1 A cross-sectional view showing a state in which fuel is injected from a fuel injection valve in an internal combustion engine.
[0018] Figure 3 It is schematically represented in Figure 1 A longitudinal sectional view showing a state where a torch flame is ejected from a sub chamber in an internal combustion engine.
[0019] Figure 4 It is schematically represented Figure 1 A perspective view showing an example of the positional relationship between the fuel injection holes and the nozzle holes in an internal combustion engine.
[0020] Figure 5 It is schematically represented in Figure 1 A cross-sectional view showing an example of a state in which a torch flame is ejected from a sub chamber in order to ignite a jet of fuel in an internal combustion engine.
[0021] Figure 6 It is a perspective view schematically showing the magnitude relationship between the distance between the axis of the first fuel injection hole and the axis of the common injection hole and the distance between the axis of the second fuel injection hole and the axis of the common injection hole.
[0022] Figure 7A It is schematically represented in Figure 1 A longitudinal sectional view of a modified example of the internal combustion engine according to the embodiment of FIG. 1 in which the arrangement of the fuel injection valve and the sub chamber is changed.
[0023] Figure 7B It is schematically represented in Figure 7A A cross-sectional view showing a state in which a jet of fuel is emitted from a fuel injection valve in an internal combustion engine.
[0024] Figure 8 This is a cross-sectional view schematically showing another modified example in which the arrangement of the fuel injection valve and the sub chamber is changed in the internal combustion engine according to the present disclosure.
[0025] Figure 9A This is a longitudinal sectional view schematically showing another modified example in which the arrangement of the fuel injection valve and the sub chamber is changed in the internal combustion engine according to the present disclosure.
[0026] Figure 9B It is schematically represented Figure 9A A cross-sectional view of another modified example of the internal combustion engine in which the arrangement of the fuel injection valve and the sub chamber is changed.
[0027] Figure 10 This is a cross-sectional view schematically showing another modified example in which the arrangement of the fuel injection valve and the sub chamber is changed in the internal combustion engine according to the present disclosure.
[0028] Figure 11 This is a cross-sectional view schematically showing another modified example in which the arrangement of the fuel injection valve and the sub chamber is changed in the internal combustion engine according to the present disclosure.
[0029] Figure 12 This is a cross-sectional view schematically showing another modified example in which the arrangement of the fuel injection valve and the sub chamber is changed in the internal combustion engine according to the present disclosure.
[0030] Figure 13 This is a cross-sectional view schematically showing another modified example in which the arrangement of the fuel injection valve and the sub chamber is changed in the internal combustion engine according to the present disclosure. DETAILED DESCRIPTION
[0031] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment.
[0032] exist Figure 1 1 shows a sub-chamber type internal combustion engine 1 according to one embodiment of the present disclosure. The internal combustion engine 1 includes a cylinder 5 forming a main combustion chamber 3; a piston 7 reciprocating within the cylinder 5; a fuel injection valve 9 injecting fuel F1 into the main combustion chamber 3; and a sub-chamber 13 disposed adjacent to the main combustion chamber 3. Hereinafter, the fuel F1 injected into the main combustion chamber 3 will be referred to as "main fuel F1."
[0033] The main fuel F1 is a gas fuel. In this embodiment, hydrogen-containing gas is used as the main fuel F1. "Hydrogen-containing gas" here includes not only fuels partially composed of hydrogen but also fuels composed entirely of hydrogen. For example, the main fuel F1 may be a mixture of natural gas and hydrogen.
[0034] The piston 7 reciprocates within the cylinder 5, driving a crankshaft (not shown) via the connecting rod 15. An intake port 19 and an exhaust port 21, each opening into the main combustion chamber 3, are formed in a cylinder head 17 located above the cylinder 5 of the internal combustion engine 1. The main combustion chamber 3 is defined by the inner circumferential surface 5a of the cylinder 5, the top surface of the piston 7, and the lower surface of the cylinder head 17. The cylinder head 17 is provided with an intake valve 2 for opening and closing the portion of the intake port 19 opening into the main combustion chamber 3, and an exhaust valve 25 for opening and closing the portion of the exhaust port 21 opening into the main combustion chamber 3.
[0035] In this embodiment, the fuel injection valve 9 is mounted on the cylinder head 17. The fuel injection valve 9 is formed as a fuel injection valve for diffusion combustion. Specifically, Figure 2 As shown, the fuel injection valve 9 is provided with a plurality of fuel injection holes 31, in this example, 8 fuel injection holes 31. The fuel injection valve 9 is formed into a cylindrical shape, and a plurality of fuel injection holes 31 are arranged along the circumference of the fuel injection valve 9. In the illustrated example, the plurality of fuel injection holes 31 are arranged at equal intervals along the circumference of the fuel injection valve 9. By providing a plurality of fuel injection holes 31 in the circumference of the cylindrical fuel injection valve 9, the main fuel F1 can be injected in a dispersed manner into the main combustion chamber 3, and highly efficient combustion can be achieved. In particular, by arranging a plurality of fuel injection holes 31 at equal intervals, the main fuel F1 can be dispersed more evenly, and extremely highly efficient combustion can be achieved. In addition, the shape of the fuel injection valve is not limited to a cylindrical shape.
[0036] In the present embodiment, the internal combustion engine 1 is configured as a diffusion combustion type, and is provided only with the fuel injection valve 9 for injecting the main fuel F1 into the main combustion chamber 3, while no fuel injection valve for injecting fuel is provided at the intake port 29. However, the internal combustion engine 1 may be configured such that, in addition to the fuel injection valve 9 for injecting the main fuel F1 into the main combustion chamber 3, another fuel injection valve is provided at the intake port 29 for injecting a fuel of a different type or amount from the main fuel F1, such as natural gas, gasoline, or a gas having a lower hydrogen content than the main fuel F1.
[0037] like Figure 1 As shown in FIG. 1 , in this example, the auxiliary chamber 13 is provided adjacent to the main combustion chamber 3 in the cylinder head 17. Figure 3 As shown, the sub-chamber 13 injects a torch flame TF into the main combustion chamber 3 via the injection hole 33. Specifically, the sub-chamber 13 includes a sub-fuel injection valve 35 for injecting the sub-chamber fuel F2, and a spark plug 37 for igniting the sub-chamber fuel F2 injected from the sub-fuel injection valve 35. The sub-chamber fuel F2 is supplied to the sub-chamber 13 via the sub-fuel injection valve 35, and the spark plug 37 ignites and burns the sub-chamber fuel F2 in the sub-chamber 13. This forms the torch flame TF that flows from the injection hole 33 toward the main combustion chamber 3.
[0038] The sub-chamber 13 is configured to ignite the main fuel F1 injected from the fuel injection valve 9 by the torch flame TF injected through the injection hole 33 in the main combustion chamber 3. Specifically, the sub-chamber "is configured to ignite the main fuel injected from the fuel injection valve 9 by the torch flame injected through the injection hole in the main combustion chamber" means, for example, Figure 4 As shown, the auxiliary chamber 13 is arranged so that the first space S1 divided by the imaginary inner peripheral surface V1 extending toward the main combustion chamber 3 of the auxiliary chamber 13 and the second space S2 divided by the imaginary inner peripheral surface V2 extending toward the main combustion chamber 3 of the fuel injection valve 9 can overlap with each other more reliably. Figure 4 In the embodiment, the peripheral wall surface 33a of the nozzle hole 33 and the peripheral wall surface 31a of the fuel injection hole 31 are conical in shape. However, the shape of these peripheral wall surfaces is not limited to conical and may be cylindrical, rectangular, or pyramidal. Furthermore, the structure in which the sub-chamber is configured to ignite the main fuel injected from the fuel injection valve by the torch flame injected through the nozzle hole in the main combustion chamber is not limited to this example.
[0039] In this embodiment, if Figure 5 As shown, the sub-chamber 13 has fewer injection holes 33 than fuel injection holes 31, in this example, six injection holes 33. At least one injection hole 33 is configured so that the torch flame TF injected through the at least one injection hole 33 ignites the main fuel F1 injected from the multiple fuel injection holes 31. In the following description, the injection hole 33 that ignites the main fuel F1 injected from the multiple fuel injection holes 31 may be referred to as a "common injection hole 33X." In the example shown, the sub-chamber 13 has injection holes 33 located on the fuel injection valve 9 side and injection holes 33 located on the side opposite to the fuel injection valve 9. In the following description, the injection hole 33 located on the fuel injection valve 9 side may be referred to as the "first injection hole 33A," and the injection hole 33 located on the side opposite to the fuel injection valve 9 may be referred to as the "second injection hole 33B." In this example, a plurality of first injection holes 33A are provided, and the injection holes at both ends of the plurality of first injection holes 33A are each configured as a common injection hole 33X that ignites the fuel injected from the two fuel injection holes 31. This configuration allows the jet of the main fuel F1 to be efficiently ignited within the main combustion chamber 3, and reliable diffusion combustion can be achieved.
[0040] However, the number of injection holes of the sub chamber is not limited to the above example, and may be appropriately set as long as the fuel from the target fuel injection hole can be ignited.
[0041] In this embodiment, the common injection hole 33X is further arranged so that, when the distance between the axis C1 of the injection hole 33 and the axis C2 of the first fuel injection hole 31A close to the injection hole 33 among the plurality of fuel injection holes 31 is L1, and the distance between the axis C1 of the injection hole 33 and the axis C3 of the second fuel injection hole 31B located farther than the first fuel injection hole 31A is L2, L1>L2. That is, Figure 6 As shown, the axis C1 of the common injection hole 33X does not intersect the axis C2 of the first fuel injection hole 31A, and passes near the axis C3 of the second fuel injection hole 31A, rather than passing through the axis C2 of the first fuel injection hole 31A. Figure 5 The torch flame TF ejected from the common injection hole 33X shown can pass through a position offset from the center of the jet of main fuel F1 ejected from the first fuel injection hole 31A, allowing only a portion of the torch flame to contact and ignite the jet of main fuel F1. Furthermore, the torch flame maintains its injection energy by passing through a position relatively far from the jet of main fuel F1 ejected from the first fuel injection hole 31A, and the remaining portion of the torch flame reaches the jet of main fuel F1 ejected from the further-located second fuel injection hole 31, thereby also igniting the jet of main fuel F1.
[0042] like Figure 5 As shown, in this embodiment, the sub-chamber 13 includes a first injection hole 33A located on the fuel injection valve 9 side and a second injection hole 33B located on the opposite side of the fuel injection valve 9. In this example, the diameter of the first injection hole 33A is larger than that of the second injection hole 33B. This configuration allows the first injection hole 33A located on the fuel injection valve 9 side to have a larger diameter than the second injection hole 33B located on the opposite side of the fuel injection valve 9. As a result, the speed of the torch flame ejected from the first injection hole 33A is faster than the speed of the torch flame ejected from the second injection hole 33B. The torch flame ejected from the first injection hole 33A ignites the portion of the main fuel F1 jet injected from the fuel injection valve 9 that is injected toward the side opposite to the sub-chamber 13. The torch flame ejected from the second injection hole 33B ignites the portion of the main fuel F1 jet injected from the fuel injection valve 9 that is injected toward the side opposite to the sub-chamber 13. By increasing the speed of the torch flame from the first nozzle 33A, the timing of ignition of the jet of main fuel F1 at a more distant location can be aligned with the timing of ignition of the jet of main fuel F1 at a closer location by the torch flame from the second nozzle 33B. This enables more uniform combustion within the main combustion chamber.
[0043] As described above, in the internal combustion engine 1 according to this embodiment, the main fuel F1 is a hydrogen-containing gas. This configuration can reduce the amount of carbon dioxide emitted from the internal combustion engine 1. Furthermore, fuel gases with a high reaction rate, such as hydrogen-containing gas, can improve combustion efficiency and suppress the generation of nitrogen oxides by using a diffusion combustion method. Therefore, the use of such fuel gases in the internal combustion engine 1 having the above-described mechanism has significant advantages. However, the main fuel is not limited to hydrogen-containing gas; fuel gases commonly used in internal combustion engines can be used, such as n-heptane, natural gas, ammonia, alcohols such as methanol and ethanol, gasoline, heavy oil, and light oil.
[0044] In this embodiment, the sub-chamber fuel F2 uses the same type of fuel as the main fuel F1. However, the sub-chamber fuel F2 can also use a fuel with higher ignitability than the main fuel F1, such as diesel fuel such as light oil, heavy oil, or biodiesel. Using a fuel with higher ignitability as the sub-chamber fuel improves ignition stability.
[0045] The internal combustion engine 1 is a large internal combustion engine used in ships, power generation equipment, etc. Figure 3 As shown, from the viewpoint of uniform combustion, it is advantageous to inject the main fuel F1 from a plurality of fuel injection holes 31, so the use of the internal combustion engine 1 having the above-described structure is highly advantageous. However, the present disclosure can also be applied to small internal combustion engines used in vehicles and the like.
[0046] In the above embodiment, an example is described in which one fuel injection valve 9 and one sub-chamber 13 are provided in the cylinder head 17. However, the number and arrangement of the fuel injection valves 9 and sub-chambers 13 are not limited to the above example and can be set arbitrarily as long as the main fuel F1 injected from the fuel injection valve 9 can be ignited by the torch flame TF from the sub-chamber 13. Other possible arrangements of the fuel injection valves 9 and sub-chambers 13 include the following modified examples.
[0047] like Figure 7A As shown, the auxiliary chamber 13 may not be adjacent to the fuel injection valve 9, but one of the fuel injection valve 9 and the auxiliary chamber 13 may be provided in the cylinder head 17, and the other of the fuel injection valve 9 and the auxiliary chamber 13 may be provided on the side of the cylinder 5 or the side of the cylinder head 17. Figure 7A In the modified example shown, the auxiliary chamber 13 is provided in the cylinder head 17, and the fuel injection valve 9 is provided on the side of the cylinder 5. Figure 5 In the example shown, the auxiliary chamber 13 has a smaller number of injection holes 33 than the fuel injection holes 31, but as shown in FIG. Figure 7BAs shown, the number of injection holes 33 may be greater than the number of fuel injection holes 31. In this example, the sub-chamber 13 has eight injection holes 33, and the fuel injection valve 9 has three fuel injection holes 31. In this case, the multiple torch flames TF injected from the injection holes 33 of the sub-chamber 13 contribute to the ignition of each jet of main fuel F1 injected from the fuel injection holes 31. Furthermore, torch flames that do not directly contribute to the ignition of the jet of main fuel F1 may also exist.
[0048] exist Figure 8 In the illustrated modification, the fuel injection valve 9 is provided in the cylinder head 17, and the sub-chamber 13 is provided on the side of the cylinder 5. Specifically, in this example, the fuel injection valve 9 having eight fuel injection holes 31 is provided in the cylinder head 17, and the sub-chamber 13 having three injection holes 33 is provided on the side of the cylinder 5. The torch flame TF injected from each injection hole 33 of the sub-chamber 13 ignites multiple jets of the main fuel F1.
[0049] In addition, multiple fuel injection valves 9 may be provided, and multiple auxiliary chambers 13 may be provided. Figure 9A In the modified example shown, one auxiliary chamber 13 is provided in the cylinder head 17, and two fuel injection valves 9 are provided on the side of the cylinder 5. Figure 9B As shown, the sub-chamber 13 has eight injection holes 33, and the two fuel injection valves 9 each have three fuel injection holes 31. Each torch flame TF ejected from the injection holes 33 of the sub-chamber 13 can contribute to the ignition of one or more jets of the main fuel F1. However, in this case, torch flames that do not directly contribute to the ignition of the jets of the main fuel F1 may also exist. In another variation (not shown), one sub-chamber 13 may be located in the cylinder head 17, and the two fuel injection valves 9 may be located on the side of the cylinder head 17.
[0050] exist Figure 10 In the illustrated variation, a single fuel injection valve 9 is provided in the cylinder head 17, and multiple sub-chambers 13, in this example, two of which are provided on the sides of the cylinder 5. Each torch flame TF ejected from the nozzle holes 33 of each sub-chamber 13 can contribute to the ignition of one or more jets of the main fuel F1. However, in this case, torch flames that do not directly contribute to the ignition of the jets of the main fuel F1 may also exist. In another variation (not shown), a single fuel injection valve 9 may be provided in the cylinder head 17, and two of the sub-chambers 13 may be provided on the sides of the cylinder head 17.
[0051] Alternatively, both the fuel injection valve 9 and the auxiliary chamber 13 may be provided on the side of the cylinder 5 or on the side of the cylinder head 17. Figure 11 The adjacent configuration shown can also be Figure 12 As shown in FIG, they are arranged in an opposing manner. Figure 13As shown, for example, the fuel injection valve 9 and the sub chamber 13 may be arranged so that an extension line of the central axis of one of the fuel injection valve 9 and the sub chamber 13 and an extension line of the central axis of the other of the fuel injection valve 9 and the sub chamber 13 form a 90° angle.
[0052] In addition, although the examples described above show that the fuel injection valve 9 has a plurality of fuel injection holes 31, the fuel injection valve may have only one fuel injection hole 31. For example, Figure 7A As shown, when the fuel injection valve 9 is provided on the peripheral wall of the cylinder 5 , one fuel injection hole 31 can be provided in the fuel injection valve 9 .
[0053] As shown in these variations, the fuel injection valve 9 does not necessarily need to be adjacent to the sub-chamber 13, which serves as the ignition source. Thus, in conventional sub-chamber-type internal combustion engines, for example, by placing the fuel injection valve 9 on the side of the cylinder 5 or the side of the cylinder head 17, an internal combustion engine capable of diffusion combustion can be easily achieved. By utilizing the sub-chamber 13 as the ignition source for diffusion combustion, design flexibility in terms of the number and placement of the fuel injection valves 9 and sub-chamber 13 is increased.
[0054] As described above, the internal combustion engine 1 according to the first aspect of the present embodiment includes: a cylinder 5 forming a main combustion chamber 3 therein; a piston 7 reciprocating within the cylinder 5; a fuel injection valve 9 injecting fuel F1 into the main combustion chamber 3; and a sub-chamber 13 disposed adjacent to the main combustion chamber 3 and configured to ignite the fuel F1 injected from the fuel injection valve 9 in the main combustion chamber 3 using a torch flame TF injected through the injection hole 33. This configuration makes it easy to flexibly accommodate changes in the specifications of the fuel injection valve 9 for an internal combustion engine capable of diffusive combustion.
[0055] In addition to the first aspect, the internal combustion engine 1 according to the second aspect of the present embodiment may be configured such that the fuel injection valve 9 is formed into a cylindrical shape, the fuel injection valve 9 has a plurality of fuel injection holes 31 arranged along the circumference of the fuel injection valve 9, and the sub-chamber 13 is configured such that the torch flame TF from the sub-chamber 13 ignites the fuel F1 injected from each of the plurality of fuel injection holes 31. With this configuration, the main fuel F1 can be injected in a dispersed manner into the main combustion chamber 3, thereby achieving highly efficient combustion.
[0056] In addition to the first or second aspects, the internal combustion engine 1 according to the third aspect of this embodiment may have a plurality of fuel injection holes 31 arranged at equal intervals along the circumferential direction. This configuration allows the main fuel F1 to be more evenly dispersed within the main combustion chamber 3, enabling efficient combustion.
[0057] In addition to any of the first to third aspects, the internal combustion engine 1 according to the fourth aspect of the present embodiment may be configured such that the sub chamber 13 includes a smaller number of injection holes 33 than the number of fuel injection holes 31, and at least one injection hole 33 is configured such that the torch flame TF injected through the at least one injection hole 33 ignites the fuel injected from the plurality of fuel injection holes 31. With this configuration, the fuel jet is efficiently ignited in the main combustion chamber 3, and diffusion combustion can be reliably achieved.
[0058] In addition to any of the first to fourth aspects, the internal combustion engine 1 according to the fifth aspect of the present embodiment may be configured such that, when the distance between the axis C1 of the injection hole 33 and the axis C2 of the first fuel injection hole 31A located closest to the injection hole 33 among the plurality of fuel injection holes 31 is L1, and the distance between the axis C1 of the injection hole 33 and the axis C3 of the second fuel injection hole 31 located farther from the first fuel injection hole 31A is L2, L1>L2. With this configuration, the main fuel F1 from the plurality of fuel injection holes 31 can be reliably ignited by the torch flame TF from the single injection hole 33.
[0059] In addition to any of the first to fifth aspects, the internal combustion engine 1 according to the sixth aspect of this embodiment may be configured such that the sub chamber 13 includes a first injection hole 33A located on the fuel injection valve 9 side and a second injection hole 33B located on the opposite side of the fuel injection valve 9, wherein the diameter of the first injection hole 33A is larger than the diameter of the second injection hole 33B. This configuration aligns the timing of ignition of the respective fuel jets, thereby achieving more uniform combustion within the main combustion chamber 3.
[0060] In addition to any of the first to sixth aspects, the internal combustion engine 1 according to the seventh aspect of this embodiment may be configured such that the fuel F1 is a hydrogen-containing gas. This configuration can reduce the amount of carbon dioxide exhausted from the internal combustion engine 1.
[0061] In addition to any of the first to seventh aspects, the internal combustion engine 1 according to the eighth aspect of the present embodiment may be configured such that the sub-chamber 13 is configured such that a first space S1 defined by an imaginary inner circumferential surface V1 extending from the peripheral wall surface 33a of the injection hole 33 of the sub-chamber 13 toward the main combustion chamber 3 and a second space S2 defined by an imaginary inner circumferential surface V2 extending from the peripheral wall surface 31a of the fuel injection hole 31 of the fuel injection valve 9 toward the main combustion chamber 3 at least partially overlap. With this configuration, the main fuel F1 injected from the fuel injection valve 9 can be more reliably ignited within the main combustion chamber 3 by the torch flame TF injected from the sub-chamber 13 through the injection hole 33.
[0062] As described above, the preferred embodiments of the present disclosure have been described with reference to the drawings, but various additions, changes, and deletions are possible without departing from the gist of the present disclosure, and therefore, these are also included in the scope of the present disclosure.
[0063] Description of Reference Numerals
[0064] 1...internal combustion engine; 3...main combustion chamber; 5...cylinder; 7...piston; 9...fuel injection valve; 13...auxiliary chamber; 31...fuel injection hole; 31A...first fuel injection hole; 31B...second fuel injection hole; 33...spray hole; 33A...first spray hole; 33B...second spray hole; 33X...common spray hole; 35...auxiliary fuel injection valve; 37...spark plug; C1...axis of the common spray hole; C2...axis of the first fuel injection hole; C3...axis of the second fuel injection hole; F1...main fuel (fuel); L1...distance from the axis of the common spray hole to the axis of the first fuel injection hole; L2...distance from the axis of the common spray hole to the axis of the second fuel injection hole; S1...first space; S2...second space; TF...torch flame.
Claims
1. An internal combustion engine, wherein: have: The cylinder, which forms the main combustion chamber inside; a piston reciprocating in the cylinder; a fuel injection valve, injecting fuel into the main combustion chamber; as well as The sub-chamber is provided adjacent to the main combustion chamber and is configured to ignite the fuel injected from the fuel injection valve using a torch flame injected through a nozzle hole in the main combustion chamber.
2. The internal combustion engine according to claim 1, wherein The fuel injection valve is formed in a cylindrical shape and has a plurality of fuel injection holes arranged along the circumference of the fuel injection valve. The sub chamber is configured so that a torch flame from the sub chamber ignites the fuel injected from each of the plurality of fuel injection holes.
3. The internal combustion engine according to claim 2, wherein: The plurality of fuel injection holes are arranged at equal intervals along the circumferential direction.
4. The internal combustion engine according to claim 2 or 3, wherein: The auxiliary chamber has the injection holes, the number of which is smaller than the number of the fuel injection holes. The at least one injection hole is configured such that a torch flame injected through the at least one injection hole ignites the fuel injected from the plurality of fuel injection holes.
5. The internal combustion engine according to claim 4, wherein The at least one nozzle hole is configured as follows: When the distance between the axis of the injection hole and the axis of the first fuel injection hole closest to the injection hole among the multiple fuel injection holes is set to L1, and the distance between the axis of the injection hole and the axis of the second fuel injection hole located farther than the first fuel injection hole is set to L2, L1>L2.
6. The internal combustion engine according to claim 2 or 3, wherein: The sub chamber has a first injection hole located on the fuel injection valve side and a second injection hole located on the opposite side to the fuel injection valve. The diameter of the first injection hole is larger than the diameter of the second injection hole.
7. The internal combustion engine according to claim 1 or 2, wherein: The fuel is hydrogen-containing gas.
8. The internal combustion engine according to claim 1 or 2, wherein: The sub-chamber is configured such that at least a portion of a first space divided by an imaginary inner circumferential surface extending the circumferential wall surface of the injection hole of the sub-chamber toward the main combustion chamber side overlaps with a second space divided by an imaginary inner circumferential surface extending the circumferential wall surface of the fuel injection hole of the fuel injection valve toward the main combustion chamber side.
Citation Information
Patent Citations
Gaseous fuel internal combustion engine
JP2007198275A
Thermosetting resin composition and applications therefor
JP2023007603A