EP4655495A1 - Verbrennungskraftmaschine für ein kraftfahrzeug - Google Patents
Verbrennungskraftmaschine für ein kraftfahrzeugInfo
- Publication number
- EP4655495A1 EP4655495A1 EP23814167.5A EP23814167A EP4655495A1 EP 4655495 A1 EP4655495 A1 EP 4655495A1 EP 23814167 A EP23814167 A EP 23814167A EP 4655495 A1 EP4655495 A1 EP 4655495A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion engine
- internal combustion
- central axis
- combustion chamber
- exhaust
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4264—Shape or arrangement of intake or exhaust channels in cylinder heads of exhaust channels
Definitions
- the invention relates to an internal combustion engine for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1.
- Such an internal combustion engine for a motor vehicle, in particular for a car is known, for example, from DE 102021 000690 A1.
- the internal combustion engine has at least one combustion chamber and at least one cylinder head, which has at least one combustion chamber roof that partially delimits the combustion chamber.
- the combustion chamber roof and thus the combustion chamber are assigned, in particular precisely, two exhaust ports of the cylinder head and, in particular precisely, a spark plug held on the cylinder head, which is arranged at least partially between the exhaust ports.
- the object of the present invention is to further develop an internal combustion engine of the type mentioned at the outset in such a way that particularly efficient operation can be achieved.
- a cylindrical recess is provided in the respective exhaust channel on a respective side of the respective exhaust channel facing the spark plug.
- the invention is based in particular on the following findings and considerations:
- a respective air flow through the respective exhaust channel, also referred to as exhaust channel flow, is important for the performance of an internal combustion engine, also referred to as The design of the exhaust duct is crucial for the combustion engine, also known as an internal combustion engine or combustion machine.
- the design of the exhaust duct which is also designed and referred to as an exhaust duct, is crucial for this.
- the exhaust duct design is usually subject to the following restrictions:
- the spark plug is advantageously positioned between the exhaust ducts and thus between the exhaust valves assigned to the exhaust ducts, but this can lead to a strong reduction in the respective air-flow cross-section of the respective exhaust duct.
- the spark plug is advantageously cooled by a water jacket between a spark plug shaft, in which the spark plug is arranged, and the respective exhaust duct, which can lead to a further reduction in the flow cross-section.
- the exhaust ducts are usually produced by means of a casting core, which forms the cylinder head, for example, as a cast component, or which has a cast body produced by casting and which has or forms the exhaust ducts.
- the casting core can advantageously be demolded towards the top. However, this results in an actually unfavourable flow guidance, which can result in separation in the respective outlet channel, which can lead to a further reduction in the effective flow cross-section.
- Possible options to at least reduce or avoid the disadvantages and problems mentioned above could include, for example, a cast surface with a cone machining in a valve seat ring, which is cost-effective but leads to very poor flow properties.
- the use of a 2D contour milling cutter would also be conceivable. For manufacturing reasons, however, this can only be manufactured parallel to the cylinder axis. This only results in moderate advantages in terms of flow guidance, mainly in the fact that the wall thickness can be reduced compared to a cast surface because no casting tolerances have to be maintained. This results in slightly larger channel cross-sections, but strong detachments (flow angle) can only be optimized to a limited extent. However, this does result in significant additional costs (long service life).
- the invention now provides a cylindrical recess for each exhaust port in the respective exhaust port and thus for each exhaust valve on the side of the respective exhaust port facing the spark plug. This makes it possible to ensure an advantageously large flow cross-section of the respective exhaust port through which air can flow in a particularly cost-effective manner.
- the respective cylindrical recess is a mechanical processing in which, for example, a 1D movement, i.e.
- a one-dimensional movement of a tool for producing the respective recess or of the cylinder head as a workpiece takes place in order to produce the respective cylindrical recess.
- the respective cylindrical recess can be produced by only a one-dimensional movement, so that the respective cylindrical recess can be produced particularly quickly and cost-effectively.
- the respective cylindrical recess makes it possible to achieve an advantageously large flow cross-section of the respective exhaust port, and compared to conventional solutions, flow angles of critical areas can be significantly optimized. It was found that the invention enables 90 percent of the flow rate of a 5-axis machining process to be achieved, but in comparison to such 5-axis machining, the respective cylindrical recess can be produced particularly cost-effectively. This enables particularly efficient operation of the internal combustion engine to be achieved in a particularly cost-effective manner.
- Fig. 1 shows a detail of a schematic plan view of an internal combustion engine onto a combustion chamber roof of the internal combustion engine
- Fig. 2 shows a partial schematic and sectional perspective view of the internal combustion engine
- Fig. 3 shows a partial schematic and sectional side view of the internal combustion engine along a section line AA shown in Fig. 1;
- Fig. 4 shows a partial schematic and sectional rear view of the internal combustion engine along a section line B-B shown in Fig. 1.
- Fig. 1 shows a detail in a schematic top view of an internal combustion engine 10 designed as a reciprocating piston engine, thus as a reciprocating piston machine, for a motor vehicle, in particular for a motor vehicle and very preferably for a passenger car.
- the internal combustion engine 10 has at least one combustion chamber 12, which is partially delimited by a cylinder 14 and partially by a combustion chamber roof 16 (Fig. 2) of the internal combustion engine 10.
- the cylinder 14 is formed by a first housing element of the internal combustion engine 10, the first housing element being, for example, a cylinder housing, in particular a cylinder crankcase.
- the combustion chamber roof 16 is formed by a second housing element of the internal combustion engine 10 designed as a cylinder head 18, the cylinder head 18 being designed separately from the first housing element and being connected to the first housing element.
- the combustion chamber 12 is also partially delimited by a piston, which is arranged in the cylinder 14 so as to be movable in translation.
- the combustion chamber 12 is assigned, in this case, two exhaust ports 20, which are formed by the cylinder head 18, i.e. limited, and thus run in the cylinder head 18.
- the respective exhaust port 20 is assigned, in particular, a respective exhaust valve 22.
- two intake ports 24 are assigned.
- the intake ports 24 are also formed by the cylinder head 18, i.e. limited, so that the intake ports 24 run in the cylinder head 18.
- the respective intake port 24 is assigned, in particular, a respective intake valve 26.
- a spark plug 28 is assigned, which is formed separately from the cylinder head 18 and is held on the cylinder head 18.
- the cylinder head 18 has a Spark plug shaft in which the spark plug 28 is at least partially arranged.
- a water jacket 30 which, for example, runs at least partially in the cylinder head 18 and is thus formed by the cylinder head 18.
- a liquid coolant which contains at least water can flow through the water jacket 30.
- the spark plug 28 can be cooled by means of the coolant flowing through the water jacket 28. It can be seen that the spark plug 28 is at least partially surrounded by the water jacket 30 on the outer circumference, with at least a respective partial region of the water jacket 30 being arranged between the spark plug 28 and the respective exhaust channel 20 or the respective exhaust valve 22. It can be seen from Fig.
- the spark plug 28 is at least partially arranged between the exhaust channels 20, in particular between the exhaust valves 22.
- the respective exhaust channel 20 has a respective inlet opening, via which the respective exhaust channel 20 itself, i.e. considered on its own, opens into the combustion chamber 12.
- exhaust gas from the combustion chamber 12 can flow through the respective inlet opening and thus flow into the respective exhaust channel 20 via the respective inlet opening, so that the exhaust gas from the combustion chamber 12 can be discharged via the exhaust channels 20.
- the spark plug 28 is arranged at least partially between the inlet openings of the exhaust channels 20.
- a respective cylindrical recess 32 is provided for each exhaust channel 20 and thus for each exhaust valve 22 in the respective exhaust channel 20 on a respective side S of the respective exhaust channel 20 facing the spark plug 28.
- a respective conical machining 34 of the respective exhaust channel 20 can be seen particularly well in Fig. 2.
- the cylindrical recess 32 which is designed as a one-dimensional recess, thus as a 1D recess.
- the respective cylindrical recess 32 is produced by a one-dimensional relative movement between the cylinder head 18 and a tool by means of which the respective recess 32 is produced.
- the respective tool is a milling cutter or milling head, so that the respective recess 32, for example, is a mechanical machining of the cylinder head 18, designed in particular as a milling.
- a first streamline is illustrated at 36.
- the streamline 36 illustrates a first flow of the exhaust gas flowing through the respective inlet opening and thus flowing into the respective outlet channel 20 via the respective inlet opening and flowing through the respective outlet channel 20, wherein the first flow of the exhaust gas illustrated by the streamline 36 occurs or would occur if the respective outlet channel 20 did not have the respective notch 32.
- a second streamline 38 illustrates a second flow of the exhaust gas flowing through the respective inlet opening and thus flowing into the respective outlet channel 20 via the respective inlet opening and flowing through the respective outlet channel 20, wherein the second flow occurs because the respective outlet channel 20 has the respective cylindrical notch 32.
- the respective notch 32 leads to a significant improvement in the flow of the exhaust gas, so that a particularly efficient and fuel-efficient operation of the internal combustion engine 10 can be achieved.
- the respective notch 32 can be produced cost-effectively.
- the respective recess 32 has a first central axis 40.
- the cylinder 14 also has a second central axis, which is also referred to as the cylinder axis.
- the cylinder 14 is at least substantially rotationally symmetrical with respect to its cylinder axis (second central axis).
- a denotes a first angle
- the first central axis 40 enclosing the first angle a with a straight line 42.
- the straight line 42 runs parallel to the cylinder axis, and the straight line 42 is spaced from the cylinder axis.
- the respective first central axis 40 runs in a respective first plane running parallel to the second central axis (cylinder axis) and spaced from the second central axis, which runs parallel to a second plane extending centrally between the outlet channels 20, in particular between the inlet openings, in which second plane the second central axis (cylinder axis) runs.
- the respective first central axis 40 encloses the first angle a with the respective straight line 42 running parallel to the second central axis and in the first plane, which angle a preferably lies in a range from 20 degrees to 60 degrees inclusive.
- Fig. 4 shows a a second angle, designated ß, is shown, which is enclosed, for example, by the respective tool 44, in particular by its third central axis, and the second central axis in a third plane in which both central axes 40 run.
- the second angle ß viewed in the third plane, is enclosed by the respective first central axis 40 and the second central axis (cylinder axis), wherein the second angle ß is preferably in a range from 1 degree to 20 degrees inclusive.
- a respective upper end E of the respective recess 32 facing away from the combustion chamber 12 is inclined away from the spark plug 28.
- spark plug shaft designated 46 in Fig. 4 can be seen in which the spark plug 28 is at least partially arranged.
- the tool 44 has, for example, a first diameter, in particular a first inner diameter, wherein, for example, the first diameter is in a range from 5 mm to 16 mm inclusive.
- the first diameter corresponds to a respective second diameter, in particular in a respective first inner diameter, of the respective cylindrical recess 32.
- the respective second diameter of the respective cylindrical recess 32 is in a range from 5 mm to 16 mm inclusive.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023000254.2A DE102023000254A1 (de) | 2023-01-27 | 2023-01-27 | Verbrennungskraftmaschine für ein Kraftfahrzeug |
| PCT/EP2023/083288 WO2024156401A1 (de) | 2023-01-27 | 2023-11-28 | Verbrennungskraftmaschine für ein kraftfahrzeug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4655495A1 true EP4655495A1 (de) | 2025-12-03 |
| EP4655495B1 EP4655495B1 (de) | 2026-03-18 |
Family
ID=88978420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23814167.5A Active EP4655495B1 (de) | 2023-01-27 | 2023-11-28 | Verbrennungskraftmaschine für ein kraftfahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4655495B1 (de) |
| JP (1) | JP2026508105A (de) |
| CN (1) | CN120530260A (de) |
| DE (1) | DE102023000254A1 (de) |
| WO (1) | WO2024156401A1 (de) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4048814B2 (ja) * | 2002-04-09 | 2008-02-20 | マツダ株式会社 | 火花点火式エンジンの吸気装置 |
| DE10060682B4 (de) * | 2000-12-07 | 2013-11-28 | Daimler Ag | Zylinderkopf für eine Brennkraftmaschine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3105235B2 (ja) * | 1990-03-30 | 2000-10-30 | マツダ株式会社 | エンジン |
| JP6435693B2 (ja) * | 2014-08-01 | 2018-12-12 | スズキ株式会社 | 内燃機関のシリンダヘッド |
| JP6365382B2 (ja) * | 2015-04-07 | 2018-08-01 | トヨタ自動車株式会社 | 内燃機関 |
| JP2020084955A (ja) * | 2018-11-30 | 2020-06-04 | トヨタ自動車株式会社 | 内燃機関 |
| DE102021000690A1 (de) | 2021-02-10 | 2022-08-11 | Mercedes-Benz Group AG | Zylinderkopf für eine Verbrennungskraftmaschine |
-
2023
- 2023-01-27 DE DE102023000254.2A patent/DE102023000254A1/de active Pending
- 2023-11-28 JP JP2025543278A patent/JP2026508105A/ja active Pending
- 2023-11-28 CN CN202380092475.5A patent/CN120530260A/zh active Pending
- 2023-11-28 EP EP23814167.5A patent/EP4655495B1/de active Active
- 2023-11-28 WO PCT/EP2023/083288 patent/WO2024156401A1/de not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10060682B4 (de) * | 2000-12-07 | 2013-11-28 | Daimler Ag | Zylinderkopf für eine Brennkraftmaschine |
| JP4048814B2 (ja) * | 2002-04-09 | 2008-02-20 | マツダ株式会社 | 火花点火式エンジンの吸気装置 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2024156401A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024156401A1 (de) | 2024-08-02 |
| JP2026508105A (ja) | 2026-03-10 |
| CN120530260A (zh) | 2025-08-22 |
| DE102023000254A1 (de) | 2024-08-01 |
| EP4655495B1 (de) | 2026-03-18 |
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