EP3034820A2 - Ventilation device for a combustion engine and combustion engine - Google Patents

Abstract

The present invention relates to a venting device (19) for discharging blowby gas from an engine block (8) of an internal combustion engine (2), wherein the venting device (19) for separating oil from the blowby gas has at least one oil separator (23, 24). A more efficient operation of the venting device and / or a more compact design of the venting device (19) results from the fact that the venting device (19) has two feed channels (25, 26) for supplying blow-by gas to the at least one oil separator (23, 24) a first feed channel (25) leads from such a first oil inlet (21) to such an oil separator (23, 24), while a second feed channel (25) leads from a second inlet (22) to a junction (27) upstream of the at least one an oil separator (23, 24) in the first feed channel (25) is arranged. This makes it possible, in particular, to realize such a venting device (19), in which at least one of the inlet openings (21, 22) is arranged above an oil level (42) of oil (41) located in the engine block (8). The invention further relates to an internal combustion engine (2) with such a venting device (19).

Description

The present invention relates to a venting device for discharging blow-by gas from an engine block of an internal combustion engine. The invention further relates to such an internal combustion engine with such a venting device.

An internal combustion engine usually has a plurality of pistons, which are arranged to be adjustable in each case in an associated cylinder of a cylinder head of the internal combustion engine. The pistons are in this case drive-connected with a crankshaft in a known manner, which is usually arranged in a crankcase of the internal combustion engine. During operation of the internal combustion engine, exhaust gas is produced in the cylinders, which can mix with oil for lubricating the pistons, for example. In this case, this exhaust gas mixture regularly passes through gaps formed between the pistons and the associated cylinders into the crankcase of the internal combustion engine. In this case, there is a need to remove this so-called blow-by gas from the crankcase or an associated engine block of the internal combustion engine. For this purpose usually venting devices are used.

From the DE 10 2009 036 443 A1 Such a venting device for a so-called V-engine is known, which is connected via a plurality of plug-in receptacles with the crankcase of the V-engine. As a result, the blow-by gas can be discharged at different positions of the engine block and in each case fed to an associated oil separator for separating oil from the blow-by gas.

The DE 197 15 233 C1 describes such a venting device, which is connected via two arranged on the crankcase of the internal combustion engine inlet openings with the crankcase. The venting device has two vent lines, each with an arranged oil separator on the outside run along the internal combustion engine. In this case, one of the vent lines opens into the oil separator of the other vent line.

The DE 101 39 137 A1 describes a venting device with a suction pump, which is connected to a hollow shaft within the crankcase, wherein the hollow shaft has a plurality of openings for discharging blow-by gas from the crankcase.

When venting devices for removing blow-by gas from the engine block of the internal combustion engine, there is a need to be able to operate reliably on the one hand and on the other hand to achieve a compact design, in particular to save space and / or weight.

The present invention therefore deals with the problem of providing for a venting device for discharging blow-by gas from an engine block of an internal combustion engine and for such an internal combustion engine improved or at least other embodiments, which are characterized in particular by an improved operation and / or a more compact design.

This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea of a venting device for removing blow-by gas from an engine block of an internal combustion engine, wherein the venting device has at least one oil separator for separating oil from the blow-by gas, with two inlet openings for discharging blow-by gas from the engine block and admitting the blow-by gas be provided in the venting device and fluidly connect these inlet openings upstream of the at least one oil separator. To this It is possible, by means of at least one oil separator of the venting device, to de-oil blowby gas passing through both inlet openings into the venting device. As a result, a reliable operation and increased efficiency of the venting device is achieved. In particular, this can reduce the number of required oil separators. In addition, the idea according to the invention makes it possible to make the venting device more compact, as a result of which a corresponding weight saving can also be achieved.

According to the idea of the invention, the venting device has the two inlet openings, namely a first inlet opening and a second inlet opening, for introducing blow-by gas originating from the engine block into the ventilation device, the inlet openings being arranged at a distance from one another. The venting device further comprises at least one such oil separator for separating oil from the blow-by gas. A first supply channel for supplying blow-by gas to the at least one oil separator in this case extends from the first inlet opening to such an oil separator. A second supply channel for supplying blow-by gas to the at least one oil separator further extends from the second inlet port to a connection point, wherein the connection point is arranged upstream of the at least one oil separator in the first supply channel. That is, the joint is arranged such that blowby gas passing into the vent through both the first inlet port and the second inlet port can be passed through the at least one oil separator to de-oil the blow-by gas. The venting device furthermore has a discharge channel for discharging de-oiled blow-by gas from the at least one oil separator.

In this context, "deoiled" blow-by gas means blow-by gas which has been passed through at least one such oil separator. That does not mean, however inevitably a complete freeing of the blowby gas of oil. This means that the de-oiled blow-by gas can contain residues of oil.

The respective oil separator can be configured in any desired manner. It is conceivable, for example, to design at least one such oil separator as impact oil separator. It is also possible to provide at least one such oil separator with a fleece and the like.

The venting device preferably has at least one Ölabführkanal for discharging separated by the at least one oil separator oil. Here, the separated oil can be discharged to any point. It is conceivable, for example, to dissipate the oil in a corresponding oil reservoir. It is particularly conceivable that at least one such Ölabführkanal is at least partially formed by one of the other channels of the venting device.

In a preferred variant, a first oil separator is arranged in the first supply channel, while a second oil separator is arranged in an oil separator channel. Here, the oil separator channel branches off at a first branch located upstream of the first oil separator and downstream of the connection point from the first supply channel and opens at a second branch in the discharge channel. This makes it possible, in particular, to guide the exhaust gas through the first oil separator and / or the second oil separator, if necessary, in order to achieve a corresponding separation of oil. In particular, it is conceivable to guide the blow-by gas through the first oil separator and / or the second oil separator or through the oil separator channel, depending on the operation of the associated internal combustion engine. It is conceivable, for example, the blow-by at low or medium loads of the internal combustion engine only through the first oil separator and thus past the oil separator channel, while the blow-by gas at higher loads, especially at full load, is also passed through the oil separator channel.

The venting device preferably has at least one venting channel for discharging de-oiled blow-by gas from the venting device. In this case, the respective venting duct can be connected to a fresh air system for supplying the internal combustion engine with fresh air and / or to an exhaust system for discharging exhaust gas of the internal combustion engine. This means that the by means of the venting device discharged from the engine block of the internal combustion engine and de-oiled blow-by gas can be supplied via the at least one venting channel at least partially the fresh air system and / or the exhaust system.

It is conceivable, for example, to provide the venting device with a first venting channel for discharging de-oiled blow-by gas, which branches off from the discharge duct at a first coupling point. The first vent channel may be fluidly connected to the fresh air system, for example. It is conceivable, for example, to connect the first venting duct downstream of a compressor for generating charge air with the fresh air system. It is also conceivable to fluidly connect the first venting channel with a suction pipe of the fresh air system.

In preferred variants, the first coupling point in the discharge channel is arranged downstream of the first oil separator and upstream of the second branch. This makes it possible, in particular blowby gas guided through the oil separator channel, which passes at the second branch in the discharge channel, pass the first venting channel. Such a configuration can be used, for example, to use the venting device according to an operating state of the associated internal combustion engine.

It is also advantageous if the venting device has a second venting channel for discharging de-oiled blow-by gas from the venting device, which branches off from the discharge duct at a second coupling point. Here, the second coupling point is preferably spaced from the first coupling point. It is conceivable to connect the second venting duct to a fresh air system of the internal combustion engine, such that blow-by gas discharged via the second venting duct passes into the fresh air system of the internal combustion engine. In this case, the second venting channel may in particular be connected fluidically to the fresh air system upstream of a compressor for generating charge air.

In advantageous variants, the second coupling point in the discharge channel is arranged downstream of the second branch. This means that blowby gas flowing through the oil separator channel can be removed by means of the second venting channel. In particular, it is possible to discharge via the second venting channel de-oiled blow-by gas which has been de-oiled by means of the at least one oil separator of the venting device.

The blow-by gas from the engine block can generally enter the venting device in any manner through the respective inlet opening. It is conceivable, for example, that the blow-by gas is sucked through at least one of the inlet openings. For this purpose, for example, serve the connection of the first venting duct to a suction pipe of the fresh air system.

It is also conceivable to blow the blowby gas out of the crankcase. Here, the crankcase is vented to drive in particular the blow-by gas in the venting device.

In advantageous alternatives, the venting device on a ventilation duct for venting the engine block. This means that the ventilation of the engine block, which can in particular serve to drive the blow-by gas into the venting device, at least partially via the ventilation duct, which is part of the venting device.

Embodiments in which the ventilation channel has a common channel section with the second venting channel are particularly preferred. This means that the common duct section of the ventilation duct and of the second venting channel can be used as needed for ventilating the engine block or for venting the venting device. For this purpose, the venting device is designed accordingly. In particular, the venting device can be designed such that the common duct section is part of the ventilation duct or part of the second vent duct depending on the operation of the associated internal combustion engine. It is conceivable, in particular, to use the common duct section at low loads of the internal combustion engine, in particular at a partial load of the internal combustion engine, as part of the ventilation duct in order to aerate the engine block. It is also conceivable to use the common channel section at higher loads of the internal combustion engine, in particular at full load of the internal combustion engine, as a venting channel. This means, in particular, that the blow-by gas is at least partially blown into the venting device at lower loads of the internal combustion engine, while the blow-by gas is at least partially sucked into the venting device at higher loads of the internal combustion engine.

According to a preferred embodiment of the venting device according to the invention, the venting device on a channel block, wherein at least two channels of the venting device are formed in the channel block. As a result, a particularly compact design of the venting device is made possible. As a result, the flow paths of the blow-by gas and / or the air for ventilating the engine block and / or the separated oil in the venting device are shortened.

In particular, embodiments in which the channel block has a lower side, on which the inlet openings are arranged, are preferred. The channel block advantageously also has an intermediate wall extending transversely to the lower side, which has a first wall side and a second wall side remote from the first wall side. The intermediate wall thus separates in particular a first area in the channel block from a second area in the channel block. In this case, the first supply channel is arranged on the first wall side of the intermediate wall, while the second supply channel is arranged on the second wall side of the intermediate wall. In addition, the connection point, via which the supply channels are fluidically connected, arranged in the intermediate wall. For this purpose, the intermediate wall may be provided with a corresponding opening or a corresponding passage. This means that the connection point can be realized in particular as an opening formed in the intermediate wall or a passage formed in the intermediate wall.

In advantageous variants, the first coupling point is arranged in the intermediate wall. Here, the first coupling point can be configured as an opening or passage in the intermediate wall. In addition, the first vent passage extends on the second wall side and has a first passage section which extends through the intermediate wall and thus leads through the intermediate wall from the second wall side to the first wall side.

Alternatively or additionally, the second coupling point in the intermediate wall, in particular as an opening or passage, may be arranged. In addition, the second vent passage extends on the second wall side and has a second passage section extending through the intermediate wall, which leads through the intermediate wall from the second wall side to the first wall side.

Embodiments in which the venting device for controlling the flow of blow-by gas between the respective channels and / or for controlling the flow of air through the ventilation duct have at least one valve device are preferred. Here, the respective valve device is adjustable at least between a closed position and an open position to direct the respective flow accordingly. Also conceivable are embodiments in which at least one such valve device is adjustable in several stages and / or continuously.

The respective valve device can thereby be self-switching and / or externally switchable, for example, be switchable by a control device.

It is conceivable in particular to provide the venting device with a valve device which allows controlling the flow of the blowby gas through the oil separator channel. Such a valve device may in particular be designed as a check valve and / or be provided at the first branch.

In this case, variants are advantageous in which the check valve is arranged such that it opens when a predetermined pressure in the first feed passage is exceeded, such that the blow-by gas also flows through the oil separator passage. It is also conceivable such a check valve, which opens with increasing pressure further to allow a stronger flow through the oil separator channel. For this purpose, the check valve may have a corresponding spring device or cooperate with such a spring device.

The internal combustion engine can be designed or configured as desired. In particular, the internal combustion engine can be designed as a series engine. However, a V-engine is also conceivable.

The engine block has a cylinder head with at least one cylinder, wherein a stroke-adjustable piston is arranged in the respective cylinder. The engine block also has a crankcase, in which a cooperating with the at least one piston crankshaft is arranged. In this case, the blow-by gas usually accumulates in the crankcase during operation of the internal combustion engine.

In particularly preferred embodiments, the inlet openings of the venting device are arranged such that at an inclination of the internal combustion engine, at least one of the inlet openings above an oil level plane is arranged by located in the engine block oil. Such inclinations of the internal combustion engine can arise, for example, in extreme situations of the internal combustion engine, in particular in extreme driving situations of an associated vehicle. These include, for example, driving along larger inclines, that is, especially downhill or hill climbs, as well as cornering. Such situations may arise, for example, when braking or accelerating the internal combustion engine. As a result, situations may occur in which the oil level increases so that at least one of the inlet openings at least partially disposed below the plane of the oil level and is in the oil Would the oil now pass through this inlet opening in the venting, so this would in particular lead to increased oil consumption of the internal combustion engine , In addition, the passage of the oil into the venting device would lead to increased wear or increased risk of damaging the venting device and / or the venting device downstream components of the internal combustion engine or the associated vehicle. The arrangement of the inlet openings such that at such inclinations of the internal combustion engine is at least one of the inlet openings above the oil level, causes the blow-by gas can pass through the other inlet opening in the venting device. In particular, the pressure resistance increases in the region of the inlet opening located below the oil level, so that the blow-by gas predominantly flows through the above the oil level plane arranged inlet opening passes into the venting device.

Such an arrangement of the inlet openings is in particular realized in that the inlet openings are arranged with respect to a tilt axis of the inclination on different sides. This means that the inlet openings are arranged on different sides, in particular opposite sides, of the tilting axis.

The venting device can be fluidly connected to the internal combustion engine or the engine block at any position in order to discharge blowby gas from the engine block. Embodiments in which the venting device is arranged or mounted on the internal combustion engine, particularly preferably on the engine block, are preferred here.

In particularly preferred variants, the venting device is arranged on a cylinder head cover of the engine block. In this case, the cylinder head cover is used in particular the cover of the cylinder head. In this case, a fluidic connection between the crankcase and the cylinder head cover is provided in the engine block so that blow-by gas from the crankcase into the cylinder head cover and can be removed via the cylinder head cover by means of the venting device. In particularly preferred embodiments, at least one of the inlet openings of the venting device is arranged in the cylinder head cover. Particularly advantageously, both inlet openings of the venting device are arranged in the cylinder head cover. As a result, in particular a compact design of the internal combustion engine is achieved. In addition, the flow paths of the blow-by gas are shortened, so that the efficiency of the venting device can be increased.

The venting device can be arranged at any point of the cylinder head cover. Particularly advantageously, at least one of the inlet openings in the region of a camshaft is arranged, which is arranged in the cylinder head cover. In this case, the camshaft is used, in particular, for actuating valves for introducing fresh air into the respective cylinder and / or discharging exhaust gas from the respective cylinder.

Embodiments in which at least one of the inlet openings is arranged in the region of the camshaft and is complementary to the camshaft, in particular to a shaft of the camshaft, prove to be particularly advantageous. In this case, embodiments are advantageous in which a relatively small distance prevails between the inlet opening and the camshaft so that there is only a narrow gap between the camshaft and the inlet opening through which blowby gas can pass through the inlet opening into the ventilation device. If the inlet opening is arranged at least partially below the plane of the oil level, this small gap results in the fact that an impact-like inflow of oil into the inlet opening is prevented.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical components.

Fig. 1

eine stark vereinfachte, schaltplanartige Darstellung eines Fahrzeugs mit einer Brennkraftmaschine,

Fig. 2

einen Schnitt durch die Brennkraftmaschine mit einer Entlüftungseinrichtung bei einer ersten Lage der Brennkraftmaschine,

Fig. 3

Schnitt wie in Fig. 2, bei einer zweiten Lage der Brennkraftmaschine,

Fig. 4

eine Frontansicht auf die Entlüftungseinrichtung im Schnitt, bei einem ersten Betriebsmodus,

Fig. 5

eine Hinteransicht auf die Entlüftungseinrichtung im Schnitt, beim ersten Betriebsmodus,

Fig. 6

Ansicht wie in Fig. 4 bei einem zweiten Betriebsmodus,

Fig. 7

Ansicht wie in Fig. 5 beim zweiten Betriebsmodus.

It show, each schematically

Fig. 1

a greatly simplified schematic diagram of a vehicle with an internal combustion engine,

Fig. 2

a section through the internal combustion engine with a venting device in a first position of the internal combustion engine,

Fig. 3

Cut as in Fig. 2 in a second position of the internal combustion engine,

Fig. 4

a front view of the venting device in section, in a first operating mode,

Fig. 5

a rear view of the venting device in section, in the first operating mode,

Fig. 6

View as in Fig. 4 in a second mode of operation,

Fig. 7

View as in Fig. 5 in the second operating mode.

Fig. 1 shows a vehicle 1 having an internal combustion engine 2. The internal combustion engine 2, which can be configured in particular as a series engine 2 ', is supplied with fresh air by means of a fresh air system 3 of the vehicle 1. The fresh air system has an air filter 4, a compressor 5 arranged downstream of the air filter 4 in the fresh air system 3 for compressing the air to be supplied to the internal combustion engine 2 and thus the supply of charge air, a charge air cooler 6 for cooling the charge air, which is arranged downstream of the compressor 5 and a downstream of the charge air cooler 6 arranged throttle device 7. By means of the throttle device 7, the internal combustion engine 2 supplied charge air or air can be metered.

The internal combustion engine 2 has an engine block 8 with a cylinder head 9, a cylinder head cover 10 for covering the cylinder head 9 and a crankcase 11. In the cylinder head 9 a plurality of cylinders 12 are formed, in each of which a piston 13 is arranged adjustable in stroke. The pistons 13 are connected to a crankshaft 14, which is mounted in the crankcase 11. In the respective cylinder 12, which provides a combustion chamber 15, air is mixed with a fuel. By combustion of the air fuel mixture in the combustion chamber 15, exhaust gas is produced, which can be removed by an exhaust system, not shown here. For supplying fresh air or discharging from the exhaust gas, the respective cylinder 12 is assigned at least one valve, not shown here, which can be actuated by means of a camshaft 16. For this purpose, the camshaft 16 at least one cam 17. In Fig. 1 Here, four such cylinders 12 can be seen, each of which is associated with such a cam 17.

In the respective cylinder 12, a gap 18 is present between the associated piston 13 and the cylinder head 9, through which exhaust gas can enter the crankcase 11 during operation of the internal combustion engine 2. Here, this exhaust gas with oil, which is provided for example for lubricating the piston 3, mix. As a result, so-called blow-by gas enters the crankcase 11. For discharging the blow-by gas from the engine block 8 or the crankcase 11, a venting device 19 is provided. In the example shown, the venting device 19 is arranged on the cylinder head cover 10. Accordingly, the engine block 8 has a fluidic connection 20, passes through the blow-by gas from the crankcase 11 in the cylinder head cover 10, where it is discharged through the venting device 19 from the engine block 8.

The venting device 19 has two vent openings 21, 22, namely a first vent opening 21 and a second vent opening 22, which are spaced apart from each other. The venting device 19 also has at least one oil separator 23, 24 for separating oil from the blow-by gas and thus for de-oiling the blow-by gas, the venting device 19 shown having two such oil separators 23, 24, namely a first oil separator 23 and a second oil separator 24 , A first supply passage 25 supplies blow-by gas to the oil separators 23, 24 and extends from the first intake port 21 to the first oil separator 23. A second supply passage 26 for supplying blow-by gas to the oil separators 23, 24 extends from the second intake port 22 to a junction 27 , which is arranged upstream of the first oil separator 23 in the first feed channel 25. Thus, blowby gas passing into the venting device 19 through the first inlet opening 21 and through the second inlet opening 22 can be guided to both oil separators 23, 24. The venting device 19 further has a discharge channel 28 for discharging blow-by means of the oil separator 23, 24 de-oiled.

The second oil separator 24 is arranged in an oil separator channel 29 of the venting device 19, which branches off at a first branch 30 from the first supply channel 25 and opens at a second branch 31 into the discharge channel 28. The first branch 30 is arranged upstream of the first oil separator 23 and downstream of the connection point 27 in the first supply channel 25. A first venting channel 32 of the venting device 19 for discharging de-oiled blow-by gas from the venting device 19 branches off at a first coupling point 33 from the discharge channel 28, while a second venting channel 34 for discharging de-oiled blow-by gas from the venting device 19 at a second coupling point 35 of the discharge channel 28th branches off, which is arranged in the discharge channel 28 downstream of the second branch 31. Here, the first venting channel 32 is fluidly connected downstream of the throttle device 7 with the fresh air system 3, while the second venting channel 34 is fluidly connected downstream of the air filter 4 and upstream of the compressor 5 with the fresh air system 3. Thus, so by means of the venting device 19 with the aid of the oil separator 23, 24 de-oiled blow-by gas to the fresh air system 3 are performed.

The venting device 19 further has a ventilation channel 36, which serves to ventilate the engine block 8, in particular of the crankcase 11. In this case, the ventilation channel 36 and the second ventilation channel 34 on a common channel section 37, which serves as needed or according to prevailing pressure conditions for ventilation of the crankcase 11 and for venting the venting device 19.

For controlling the flows through the venting device 19, a plurality of valve devices 38 are provided. These include a arranged in the oil separator channel 29 at the first branch 30 valve means 38, which has a check valve 38 'and is designed as such a check valve 38'. In this case, the check valve 38 'is arranged and configured such that it opens when exceeding a predetermined pressure at the first branch 30. That is, the check valve 38 'opens at high pressure in the blow-by gas, such that the blow-by gas flows through the first oil separator 23 and also through the oil separator channel 29 through the second oil separator 24. Such pressure conditions prevail in particular when the internal combustion engine 2 is operated at high loads, in particular at full load.

Another such valve means 38 is disposed in the first vent passage 32 to release or stop discharge of de-oiled blowby gas through the first vent passage 32. In this case, the valve device 38 could also be arranged at the first coupling point 33. Another such valve device 38 is disposed on the second coupling point 35 arranged in the discharge channel 28 downstream of the first coupling point 33. This valve device 38 is such configured to be able to control a flow between the discharge channel 28, the second deaeration channel 34 and the ventilation channel 36. Thus, it is thus also possible with this valve device 38 to use the common channel section 37 of the ventilation channel 36 and the second venting channel 34 for venting the crankcase 11 or for removing de-oiled blow-by gas from the venting device 19.

At lower loads of the internal combustion engine 2, when compared to the full load less blow-by gas is formed and the check valve 38 'is closed, the discharge of de-oiled blowby preferably via the first vent passage 32. In this case, the common portion 37 together with the ventilation duct 36 for Ventilation of the crankcase 11 are used to ensure improved flow in the crankcase 11 and the fluidic connection 20 and the venting device 19.

With larger Blowbygasvorkommen, ie in particular during operation of the internal combustion engine 2 at full load, the removal of deoiled blow-by gas from the venting device 19 is preferably via the second vent passage 34. Here, by the fluidic connection of the second vent passage 34 upstream of the compressor 5 of the fresh air system 3, the blow-by gas sucked through the venting device 19 from the engine block 8.

Fig. 2 shows a section through the cylinder head cover 10 of the internal combustion engine 2 with the venting device 19. It can be seen here that the inlet openings 21, 22 of the venting device 19 are arranged in the cylinder head cover 10. Accordingly, the venting device 19 projects at least partially into the cylinder head cover 10 with the first supply passage 25 and the second supply passage 26. When in Fig. 2 As shown, the internal combustion engine 2 has two such camshafts 16, which are arranged in the cylinder head cover 10. In this case, the first inlet opening 21 and the second inlet opening 22 each arranged in the region of such a camshaft 16 and have a camshaft 16, in particular a shaft 39 of the camshaft 16, complementary shape. That is, in the example shown, the inlet openings 21, 22 have a curved shape following the curvature of the shaft 39. As a result, only a small gap 40 is present between the respective inlet opening 21, 22 and the associated camshaft 16, through which blow-by gas can reach the venting device 19 via the inlet openings 21, 22.

Fig. 2 shows the internal combustion engine 2 in a normal operating position. It can be seen that in this situation, located in the cylinder head cover 10 oil 41 is below the inlet openings 21, 22, so that blow-by gas can pass through both inlet openings 21, 22 in the venting device 19. In this case, the oil 41 defines an oil level plane 42.

Fig. 3 shows the internal combustion engine 2 Fig. 2 at an inclination about an inclination axis 43. Here, the first inlet opening 21 is substantially covered by the oil 41 and arranged below the oil level plane 42. However, the second inlet opening 22 is arranged outside the oil 41 or above the oil level plane 42. This means that in this case the discharge of blow-by gas from the cylinder head cover 10 takes place via the second inlet opening 22, which is not influenced by the oil 41 or by the oil level plane 42. That is to say, the inlet openings 21, 22 are arranged such that at inclinations of the internal combustion engine 2 about the inclination axis 43 at least one of the inlet openings 21, 22 is arranged above the oil level plane 42. A discharge of blow-by gas from the cylinder head cover 10 and the engine block 8 can continue to be done easily. Such an arrangement of the inlet openings 21, 22 is realized in the example shown such that the inlet openings 21, 22 with respect to the inclination axis 43 on different sides, in particular opposite, are arranged. In addition, through the narrow gap 40 between the camshaft 16 and the first opening 21, prevents the oil 41 can pass abruptly through the first inlet opening 21 into the venting device 19.

As in particular from the Fig. 4 to 7 As can be seen, the venting device 19 has a channel block 44. It is in the 4 and 5 a first mode of operation is shown while in the 6 and 7 a second mode of operation is shown. The channel block 44 is made in the example shown from a metallic material and has a lower side 45 or short bottom 45, on which the inlet openings 21, 22 are arranged. In the example shown, the lower side 45 has two lower side sections 45 ', 45 ", which are arranged at different heights, in order to allow an arrangement of the venting device 19 that is complementary to the cylinder head cover 10 (cf. Fig. 2 ). The channel block 44 has an intermediate wall 46 that extends transversely to the underside 45 and that has a first wall side 47 and a second wall side 48 facing away from the first wall side 47. The intermediate wall 46 thus fluidly separates a first region 49 of the channel block 44 from a second region 50 of the channel block 44. The solid arrows 51 show the flow path of the blowby gas. It can be seen that the first feed channel 25 is arranged on the first wall side 47 of the intermediate wall 46, while the second feed channel 26 is arranged on the second wall side 48 of the intermediate wall 46. The first feed channel 25 is thus formed on the first wall side 47 in the channel block 44, while the second feed channel 26 is formed on the second wall side 48 in the channel block 44. Here, the connection point 27 is formed in the intermediate wall 46 as a passage 52.

The dashed arrows 53 show the flow of de-oiled blow-by gas and thus blow-by gas which has already flowed through at least one of the oil separators 23, 24. It can be seen that the discharge channel 28 is arranged on the first wall side 47, wherein the first coupling point 33 is formed as a passage 52 in the intermediate wall 46, such that the first venting channel 32nd is arranged on the second wall side 48. The first venting channel 32 also has a first passage section 54, which leads through the intermediate wall 46 from the second wall side 48 to the first wall side 47.

The first branch 30 and the oil separator channel 29 are arranged on the first wall side 47. In this case, the second branch 33 is formed as a passage 52 in the intermediate wall 46, so that the second vent passage 34 extends on the second wall side 48 and has a second passage section 55 which extends through the intermediate wall 46 from the second wall side 48 to the first wall side 46 leads.

The dot-dashed arrows 56 symbolize the flow of air through the ventilation duct 36. It can be seen that the ventilation duct 36 extends from the second passage section 55 along the second venting duct 34 to the second branch 35, whereby the common section 37 is defined. The ventilation duct 36 also extends from the second branch 33 to an outlet 57 of the venting device 19.

Here are in the 4 and 5 the currents at low loads of the internal combustion engine 2, in particular at partial load of the internal combustion engine 2, while in the 6 and 7 the flows at higher loads of the internal combustion engine 2, in particular at full load of the internal combustion engine 2 are shown. While at part load of the oil separator channel 29 is not flowed through by the blowby gas, both oil separators 23, 24 and thus also the oil separator channel 29 are flowed through by blowby gas at full load. In addition, the common channel section 37 is used at partial load for aerating the engine block 8 and thus as part of the ventilation duct 36, while the common duct section 37 is used at full load as part of the second ventilation duct 34.

In the Fig. 4 and 6 It can also be seen that both oil separators 23, 24 are arranged on the first wall side 47. In this case, the first oil separator 23 is designed as a baffle oil separator 23 'and has at least one nozzle 58 and a baffle 59 arranged downstream of the at least one nozzle 58. The second oil separator 24 has at least one non-visible nozzle, which is formed or arranged in the region of the valve seal 38. The second oil separator also has a fleece 60, which acts as a baffle and can be separated with the oil from the blow-by gas.

The oil separated from the blow-by gas by the oil separators 23, 24 can, as indicated by the long dash-dotted arrows 61, along the discharge channel 28 and the Ölabscheiderkanals 29 to an outlet 62 on the channel block 44 and the outlet 62 to a not shown From where there is an oil reservoir, especially in the FIGS. 2 and 3 shown oil 41 may be supplied.

Claims (17)

Venting device (19) for discharging blowby gas from an engine block (8) of an internal combustion engine (2), with a first inlet opening and a second inlet opening spaced from the first inlet opening for introducing blow-by gas originating from the engine block into the ventilation device, with at least one oil separator (23, 24) for separating oil from the blow-by gas, - With a first feed channel (25) for supplying blow-by gas to the at least one oil separator (23, 24), wherein the first feed channel (25) extends from the first inlet opening (21) to such an oil separator (23, 24), - With a second supply channel (26) for supplying blowby gas to the at least one oil separator (23, 24), - wherein the second feed channel (26) extends from the second inlet opening (22) to a connection point (27) which is arranged upstream of the at least one oil separator (23, 24) in the first feed channel (25), - With a discharge channel (28) for discharging deoiled blow-by gas from the at least one oil separator (23, 24). Venting device according to claim 1,
characterized, in that a first oil separator (23) is arranged in the first feed channel (25), - That in a Ölabscheiderkanal (29) a second oil separator (24) is provided, - wherein the oil separator channel (29) at a upstream of the first oil separator (23) and downstream of the connection point (27) arranged first branch (30) branches off from the first feed channel (25) and at a second branch (31) in the discharge channel (28) empties. Venting device according to claim 1 or 2,
marked by
a first vent channel (32) for removing de-oiled blow-by gas from the venting device (19), which branches off at a first coupling point (33) from the discharge channel (28). Venting device according to claim 3,
characterized,
that the first coupling point (33) is arranged in the discharge channel (28) downstream of the first oil separator (23) and upstream of the second branch (31). Venting device according to one of claims 1 to 4,
marked by
a second vent channel (34) for discharging de-oiled blow-by gas from the venting device (19), which branches off at a second coupling point (35) from the discharge channel (28). Venting device according to claim 5,
characterized,
that the second coupling point (35) in the discharge channel (28) downstream of the second Branch (31) is arranged. Venting device according to claim 5 or 6,
marked by
a ventilation duct (36) for ventilating the engine block (8), which has a common duct section (37) with the second vent duct (34), wherein the venting device (19) is designed such that the common duct section (37) depends on the operation of the associated internal combustion engine (2) is part of the ventilation duct (36) or part of the second venting channel (34). Venting device according to one of claims 1 to 7,
characterized,
in that the venting device (19) has a channel block (44) in which at least two of the channels (25, 26, 28, 29, 32, 34, 36, 37) are at least partially formed. Venting device according to claim 8,
characterized, in that the channel block (44) has a lower side (45) on which the inlet openings (21, 22) are arranged, - that the channel block (44) has a transversely to the lower side (45) extending intermediate wall (46), - That the first feed channel (25) on a first wall side (47) of the intermediate wall (46) is arranged, - That the second feed channel (26) on one of the first wall side (47) facing away from the second wall side (48) of the intermediate wall (46), - That the connection point (27) in the intermediate wall (46) is arranged. Venting device according to claim 9,
characterized, - That the first coupling point (33) in the intermediate wall (46) is arranged, - That the first vent passage (32) extends on the second wall side (48) and a through the intermediate wall (46) extending first passage portion (54) through the intermediate wall (46) from the second wall side (48) on the first wall side (47) leads. Venting device according to claim 9 or 10,
characterized, - That the second coupling point (35) in the intermediate wall (46) is arranged, - That the second vent passage (34) extends on the second wall side (48) and a through the intermediate wall (46) extending second passage portion (55) through the intermediate wall (46) from the second wall side (48) on the first wall side (47) leads. Venting device according to one of claims 1 to 11,
characterized,
in that at least one valve device (38) is provided for controlling the flow of blow-by gas between the channels. Venting device according to claim 13,
characterized,
in that such a valve device (38) is provided for controlling the flow through the oil separator channel (29), which has a check valve (38 '). Internal combustion engine (2) with an engine block (8) and a venting device (19) according to one of claims 1 to 13, wherein the engine block (8) has a cylinder head (9) with at least one cylinder (12) and a piston (13) arranged to be adjustable in stroke therein, - The engine block (8) has a crankcase (11) in which a with the at least one piston (13) cooperating crankshaft (14) is arranged, - The first inlet port (21) and the second inlet port (22) of the venting device (19) for discharging blowby gas from the engine block (8) are fluidly connected to the engine block (8). Internal combustion engine according to claim 14,
characterized,
that the inlet openings (21, 22) are arranged such that, when a tendency of the internal combustion engine (2) at least one of the inlet openings (21, 22) above an oil level plane (42) is disposed of in the engine block (8) befindendem oil (41) , Internal combustion engine according to claim 14 or 15,
characterized, - That the engine block (8) has a cylinder head cover (10) for covering the cylinder head (9), - That the engine block (8) has a fluidic connection (20) for discharging blow-by gas from the crankcase (11) in the cylinder head cover (10), - That the first inlet opening (21) and the second inlet opening (22) in the cylinder head cover (10) are arranged. Internal combustion engine according to claim 17,
characterized,
in that in the cylinder head cover (10) a camshaft (16) is arranged, wherein at least one of the inlet openings (21, 22) in the region of the camshaft (16) arranged and complementary to the camshaft (16), in particular to a shaft (39) of the camshaft (16) is formed.

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