Gas exchange valve control system for internal combustion engine and internal combustion engine

Abstract

The invention relates to a gas exchange valve control system (10) for an internal combustion engine, in particular for a large internal combustion engine, comprising at least one camshaft (11) which carries an intake cam (12) for controlling an intake valve and an exhaust cam (13) for controlling an exhaust valve for a cylinder group of cylinders arranged next to one another, wherein the intake cam (12) in the first variant and the exhaust cam (13) in the second variant are arranged non-rotatably on the respective camshaft (11) and can be driven by the respective camshaft (11), and wherein the exhaust cam (13) in the first variant and the intake cam (12) in the second variant are rotatably mounted on the respective camshaft (11), and can be driven by a separate drive shaft (14).

Description

Technical Field

[0001] This invention relates to a gas exchange valve control system for an internal combustion engine and an internal combustion engine. Background Technology

[0002] Large internal combustion engines are used, for example, as marine engines in ships. For large internal combustion engines, the cylinder has a piston diameter of at least 140 mm, and particularly at least 175 mm.

[0003] An internal combustion engine comprises multiple cylinders. Each cylinder of an internal combustion engine includes at least one intake valve and at least one exhaust valve, wherein combustion air is introduced into the corresponding cylinder via the at least one intake valve, and exhaust gases are discharged from the corresponding cylinder via the at least one exhaust valve. In addition to the gas exchange valves, the cylinders of an internal combustion engine also include a fuel metering device through which fuel is introduced into each cylinder.

[0004] To control the gas exchange valves of the cylinders in an internal combustion engine, the engine includes a gas exchange valve control system. Such a gas exchange valve control system includes at least one camshaft.

[0005] From practical experience, we know that in an internal combustion engine, the intake cam for controlling the intake valve of the cylinder and the exhaust cam for controlling the exhaust valve of the cylinder are each arranged on a separate camshaft. Furthermore, a gas exchange valve control system for an internal combustion engine is known, in which the intake cam for controlling the intake valve of the cylinder and the exhaust cam for controlling the exhaust valve of the cylinder are arranged on at least one common camshaft. The camshaft supporting both the intake and exhaust cams is called a combined camshaft.

[0006] To date, gas exchange valves with camshafts housing both intake cams for controlling intake valves and exhaust cams for controlling exhaust valves have not allowed for valve timing adjustments to the intake and exhaust valves of the cylinders in internal combustion engines. independent Flexible adjustment is required. Therefore, currently it is necessary to arrange the intake and exhaust camshafts on separate camshafts. A gas exchange valve control system for internal combustion engines is needed, in which the intake and exhaust camshafts can be jointly arranged on at least one camshaft, but the intake and exhaust valves of the internal combustion engine cylinders can be adjusted as needed. independent Flexible valve timing. Summary of the Invention

[0007] Therefore, the object of the present invention is to create a novel gas exchange valve control system for an internal combustion engine, and an internal combustion engine having this gas exchange valve control system. This object is achieved by the gas exchange valve control system according to claim 1 and the internal combustion engine according to claim 11.

[0008] In the first variant of the invention, the intake cam and in the second variant, the exhaust cam, are non-rotatably arranged on their respective camshafts and can be driven from their respective camshafts. In the first variant, the exhaust cam and in the second variant, the intake cam, are rotatably mounted on their respective camshafts and can be driven by separate drive shafts. In the gas exchange valve control system according to the invention, in the first variant, only the intake cam is non-rotatably arranged on its respective camshaft, and in the second variant, only the exhaust cam is non-rotatably arranged on its respective camshaft, while in the first variant, the exhaust cam and in the second variant, the intake cam are rotatably mounted on their respective camshafts and can be driven from their respective separate drive shafts. Therefore, although the intake and exhaust cams are arranged on a common camshaft, it is still possible to provide intake and exhaust valves for the cylinders of an internal combustion engine with minimal installation space requirements. independent Flexible valve timing. In particular, existing internal combustion engines can be easily retrofitted or converted using the gas exchange valve control system according to the invention.

[0009] Preferably, the respective camshaft and the respective individual drive shaft are engaged via drive gears, i.e. via a camshaft drive gear arranged on the respective camshaft and a drive shaft drive gear arranged on the respective drive shaft. This allows the respective drive shaft to be driven starting from the respective camshaft.

[0010] Preferably, the corresponding camshaft is equipped with a phase adjuster to rotate the corresponding camshaft relative to the camshaft drive gear. Alternatively or additionally, the corresponding drive shaft is equipped with a phase adjuster to rotate the corresponding drive shaft relative to the drive shaft drive gear. Through the corresponding phase adjuster, the camshaft drive gear can be rotated relative to the camshaft, and the drive shaft drive gear can be rotated relative to the drive shaft to provide corresponding flexible valve timing in the areas of the intake and / or exhaust valves.

[0011] In the first variant of the invention, each exhaust cam and in the second variant, each intake cam, preferably engage with the gear of the corresponding drive shaft via a separate gear. Alternatively, each of the two exhaust cams in the first variant and each of the two intake valves in the second variant alternately engage with the gear of the corresponding drive shaft via a common gear. In particular, when each exhaust cam in the first variant and each intake cam in the second variant engage with the gear of the drive shaft via a separate gear, the remaining engine structure can remain unchanged compared to an internal combustion engine having a hybrid camshaft (on which both intake and exhaust cams are non-rotatably arranged). In particular, the construction and arrangement of the pushrods and rocker arms remain unchanged. However, when each of the two exhaust cams in the first variant and each of the two intake cams in the second variant are operably connected to the gear of the drive shaft via a common gear, the construction and arrangement of the pushrods and rocker arms must be adjusted.

[0012] Preferably, the fuel cam for controlling the fuel pump is non-rotatably arranged on the corresponding camshaft and can be driven from the corresponding camshaft. Fuel delivered by the fuel pump can be individually introduced into the corresponding cylinder via an electronically or electrically controlled fuel metering device. In this way, a particularly compact design of the internal combustion engine becomes possible.

[0013] Preferred further developments of the invention can be obtained from the dependent claims and the following description. Exemplary embodiments of the invention have been explained in more detail with reference to the accompanying drawings, but are not limited thereto. Attached Figure Description

[0014] Here it is shown: Figure 1 A schematic diagram of the camshaft of the first internal combustion engine according to the present invention. Figure 2 A schematic diagram of the camshaft of the second internal combustion engine according to the present invention. Figure 3 A schematic diagram of the camshaft of the third internal combustion engine according to the present invention. Figure 4 : Figure 1 , Figure 2 or Figure 3 Another schematic diagram of the camshaft in the diagram. Figure 5 : Figure 4 Alternative options. Detailed Implementation

[0015] Figure 1 A diagram of a first gas exchange valve control system 10 for an internal combustion engine (particularly for a large internal combustion engine) according to the present invention is shown, wherein... Figure 1 A camshaft 11 is shown, on which intake cams 12 for controlling intake valves of cylinder banks arranged side-by-side and exhaust cams 13 for controlling exhaust valves are arranged. Figure 1 In this configuration, the exhaust cam 13 is non-rotatably mounted on the camshaft 11, specifically via a press fit. In contrast, in... Figure 1 In this configuration, the intake cam 12 is rotatably mounted on the camshaft 11. The intake cam 12, rotatably mounted on the camshaft 11, can be driven from a first separate drive shaft 14.

[0016] The drive shaft 14 extends parallel to the camshaft 11, wherein each intake cam 12, which is rotatably mounted on the camshaft 11, is operatively connected to a gear 15 that meshes with a gear 16 arranged on a separate drive shaft 14 in order to drive the intake cams 12. Thus, rotational movement of the drive shaft 14 is transmitted to the corresponding intake cam 12 via the meshing gears 15, 16.

[0017] Figure 2 It shows Figure 1 A variation of the gas exchange valve control system 10, wherein the intake cam 12 is non-rotatably arranged on the camshaft 11, and the exhaust cam 13 is rotatably mounted on the camshaft 11. Therefore, the gear 17, meshing with the gear 18 arranged on a separate drive shaft 14, and... Figure 2 The exhaust cam 13 is operably connected to transmit rotational movement of the individual drive shaft 14 to the exhaust cam 13 via meshing gears 17, 18.

[0018] Therefore, in Figure 1 and 2 In an exemplary embodiment, a cam rotatably mounted on a corresponding camshaft 11 (in Figure 1 The middle is the intake cam 12, and in Figure 2 The exhaust cam 13 is individually operably connected to gears 15 and 17, which are rotatably mounted on camshaft 11, and engages with individual gears 16 and 18 on respective individual drive shafts 14 via corresponding gears 15 and 17 rotatably arranged on the respective camshaft 11, for driving the meshing gears 15 and 16 or 17 and 18 from drive shaft 14, and thus driving the corresponding cam (in Figure 1 The middle is the intake cam 12, and in Figure 2 The exhaust cam 13 is located in the middle. Gears 16 and 18 are non-rotatably arranged on the drive shaft 14.

[0019] Figure 3 Another variation of the gas exchange valve control system 10 according to the invention is shown, wherein in Figure 3In this configuration, two intake cams 15, each rotatably arranged on the camshaft 11, are equipped with a common gear 15, also rotatably mounted on the camshaft 11, for meshing via this common gear 15 with a gear 16 non-rotatably arranged on a separate drive shaft 14. Therefore, with... Figure 1 In comparison, the number of gears 15 and 16 can be reduced, that is, halved.

[0020] Figure 3 The principle can also be transferred to Figure 2 In order to drive two rotatably mounted exhaust cams 13 via a common gear 17, which meshes with a gear 18 arranged on a drive shaft 14.

[0021] according to Figure 4 The camshaft 11 is driven by a camshaft drive gear 19 arranged on the camshaft 11, and a separate drive shaft 14 is driven by a drive shaft gear 20 arranged thereon. Figure 4 In this configuration, the camshaft drive gear 19 and the drive shaft gear 20 mesh with each other. The camshaft drive gear 19 can be driven from the crankshaft to drive the camshaft 11. The separate drive shaft 40 can also be driven from the camshaft 11, i.e., via the meshing or engaging drive gears 19 and 20.

[0022] according to Figure 4 The camshaft 11 is equipped with a phase adjuster 21 and / or a separate drive shaft 14 is equipped with a phase adjuster 22. The phase adjuster 21 allows the camshaft 11 to rotate relative to the camshaft drive gear 19; the phase adjuster 22 allows the drive shaft 14 to rotate relative to the drive shaft gear 20. This facilitates independent and flexible valve timing for the intake and exhaust valves.

[0023] Figure 5 It shows Figure 4 The modification includes a second camshaft drive gear 23, in addition to the camshaft drive gear 19, which is ultimately used to connect the camshaft 11 to the crankshaft. This may be advantageous for minimizing installation space.

[0024] In the exemplary embodiment shown, the fuel cam 24 is also non-rotatably arranged and can be driven via a corresponding camshaft 11. The fuel cam 24 is used to control the fuel pump, particularly the high-pressure fuel pump, to deliver fuel, wherein an electronically or electrically controlled fuel metering device, particularly a fuel injector, is connected between the corresponding fuel pump and the corresponding cylinder, through which fuel can ultimately be individually introduced into the corresponding cylinder.

[0025] As already explained, in the gas exchange valve control system 10 according to the invention, the intake cam 12 or the exhaust cam 13 arranged on the respective camshaft 11 is no longer fixedly arranged on the respective camshaft but is rotatably arranged so as to enable flexible valve timing of the intake and exhaust valves. The respective cams rotatably mounted on the respective camshaft 11 can be driven from a separate drive shaft 14. The camshaft 11 and the separate drive shaft 14 can each be phase-adjusted via phase adjusters 21 and 22.

[0026] Furthermore, the present invention relates to an internal combustion engine having a gas exchange valve control system 10 designed as described above. It is used at least to control the gas exchange valves, i.e., the intake and exhaust valves of the cylinders of the internal combustion engine arranged side-by-side, and particularly also to control the fuel pump. When the cylinders form multiple cylinder groups arranged side-by-side, the gas exchange valve control system 10 preferably interacts with each cylinder group.

[0027] The internal combustion engine according to the invention is particularly a large internal combustion engine, such as, for example, an internal combustion engine used on ships. In the large internal combustion engine, the cylinder has a piston diameter of at least 140 mm, particularly at least 175 mm.

[0028] Reference Number List 10 Gas exchange valve control system 11 Camshaft 12 Intake Cam 13 Exhaust Cam 14 drive shafts 15 Gears 16 gears 17 Gears 18 gears 19 Camshaft drive gear 20 Drive shaft drive gear 21 Phase Adjuster 22 Phase Adjuster 23 Camshaft drive gear 24. Fuel Cam.

Claims

1. A gas exchange valve control system (10) for internal combustion engines, particularly for large internal combustion engines. It has at least one camshaft (11) which carries an intake cam (12) for controlling the intake valve and an exhaust cam (13) for controlling the exhaust valve in a cylinder bank of cylinders arranged side by side. Its features In the first variant, the intake cam (12) and in the second variant, the exhaust cam (13) are non-rotatably arranged on the corresponding camshafts (11) and can be driven by the corresponding camshafts (11). In the first variant, the exhaust cam (13) and in the second variant, the intake cam (12) are rotatably mounted on the respective camshafts (11) and can be driven by separate drive shafts (14).

2. The gas exchange valve control system (10) according to claim 1, characterized in that, The respective camshaft (11) and the respective individual drive shaft (14) extend parallel to each other.

3. The gas exchange valve control system (10) according to claim 1 or claim 2, characterized in that, The respective camshaft (11) and the respective individual drive shaft (14) are engaged via drive gears (19, 20), i.e. via camshaft drive gear (19) arranged on the respective camshaft (11) and drive shaft drive gear (20) arranged on the respective drive shaft (14).

4. The gas exchange valve control system (10) according to claim 3, characterized in that, The respective camshaft (11) is equipped with a phase adjuster (21) for twisting the respective camshaft (11) relative to the camshaft drive gear (19).

5. The gas exchange valve control system (10) according to claim 3 or claim 4, characterized in that, The respective drive shaft (14) is equipped with a phase adjuster (22) for twisting the respective drive shaft (14) relative to the drive shaft drive gear (20).

6. The gas exchange valve control system (10) according to any one of claims 1 to 5, characterized in that, The corresponding camshaft (11) can be driven from the crankshaft, and the corresponding drive shaft (14) can be driven from the corresponding camshaft (11).

7. The gas exchange valve control system (10) according to any one of claims 1 to 6, characterized in that, In the first variant, each exhaust cam (13) and in the second variant, each intake cam (12) engages with the gears (16, 18) of the corresponding drive shaft (14) via separate gears (15, 17).

8. The gas exchange valve control system (10) according to any one of claims 1 to 6, characterized in that, Each of the two exhaust cams (13) in the first variant and each of the two intake cams (12) in the second variant engages with the gears (16, 18) of the corresponding drive shaft (14) via common gears (15, 17).

9. The gas exchange valve control system (10) according to any one of claims 1 to 8, characterized in that, The fuel cam (24) for controlling the fuel pump is non-rotatably arranged on the corresponding camshaft (11) and can be driven from the corresponding camshaft (11).

10. The gas exchange valve control system (10) according to claim 9, characterized in that, Fuel delivered by the fuel pump can be individually introduced into the respective cylinders via an electronically or electrically controlled fuel metering device.

11. An internal combustion engine, particularly a large internal combustion engine, The device has multiple cylinders, each cylinder having a gas exchange valve, each gas exchange valve including at least one intake valve and at least one exhaust valve, so as to individually supply combustion air to each cylinder via the respective at least one intake valve, and to individually exhaust gas from the respective cylinder via the respective at least one exhaust valve. The cylinders therein form at least one cylinder group, with cylinders arranged side by side. Its features The cylinders of the corresponding cylinder group are equipped with a gas exchange valve control system (10) according to any one of claims 1 to 10, the system controlling the intake valve and exhaust valve of the cylinders of the corresponding cylinder group.

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