DE102010004805A1 - Cylindrical head cover for recharged internal combustion engine of motor vehicle, has cylindrical head cover housing, cylindrical head cover internal space, oil-separating device, two return valves and anti-vacuum valve - Google Patents

Abstract

The cylindrical head cover (1) comprises a cylindrical head cover housing (3), a cylindrical head cover internal space, oil-separating device (5), two return valves (6,7) and an anti-vacuum valve (8). A module housing (9) comprises a plastic material, an aluminum alloy and an input opening for an input channel. The module housing comprises an outlet opening for an output channel. An independent claim is also included for a recharged internal combustion engine with an exit surface.

Description

The invention relates to a cylinder head cover for a rechargeable internal combustion engine of a motor vehicle, a rechargeable internal combustion engine for a motor vehicle and a motor vehicle with a rechargeable internal combustion engine.

In the operation of an internal combustion engine in the combustion chambers resulting combustion gases pass partially past the piston rings in the crankcase of the internal combustion engine. Such escaping combustion gases are known as so-called blow-by gases. These gases can be sucked by means of a suction line, for example in the form of a suction pipe or an intake pipe, to re-supply them to the internal combustion engine. In rechargeable internal combustion engines, such a return is only possible to a limited extent, since a back pressure builds up in the intake manifold in the supercharger operation of the internal combustion engine and the blow-by gases would be pushed back into the crankcase.

From the DE 10 2008 023 381 A1 For example, an intake manifold assembly for a chargeable internal combustion engine is known which includes an intake manifold leading to a turbocharger, an intake manifold leading from the turbocharger to the engine, and a first blow-by conduit leading from a crankcase of the combustion engine to the intake manifold. The first blow-by channel is connected to the intake manifold via a valve. Furthermore, the intake manifold assembly includes a second blow-by passage extending from the first blow-by passage to the intake manifold. In this way, sufficient ventilation of the crankcase is ensured in the supercharged operation of the internal combustion engine when the internal combustion engine is in load operation.

A disadvantage of known Saugrohranordnungen is that the blow-by gases are partially transported over relatively long external lines, whereby the risk of icing in cold weather, which can lead to a malfunction of the crankcase ventilation, is increased. In addition, the external lines require increased installation costs, for example by connecting the external lines to the cylinder head cover by means of clamps or other fasteners. In addition, external lines can be easily damaged due to their low-protection arrangement and thus leaking.

The object of the invention is to provide a cylinder head cover for a rechargeable internal combustion engine of a motor vehicle, a rechargeable internal combustion engine for a motor vehicle and a motor vehicle with a chargeable internal combustion engine, in which the risk of icing of a crankcase ventilation system is reduced and which also require less installation effort.

This object is achieved with the subject matter of the independent claims. Advantageous developments emerge from the dependent claims.

According to the invention, a cylinder head cover for a rechargeable internal combustion engine of a motor vehicle is provided, which has a cylinder head cover housing and a cylinder head cover interior. Furthermore, the cylinder head cover has at least one Ölabscheidevorrichtung, a first check valve, a second check valve and a vacuum relief valve. The at least one Ölabscheidevorrichtung, the first check valve, the second check valve and the vacuum relief valve are arranged in a common module housing. The module housing has an inlet opening for an inlet channel, a first outlet opening for a first outlet channel, a second outlet opening for a second outlet channel and a third outlet opening for a third outlet channel. Blow-by gases can be routed via the input channel, the first output channel and the second output channel. The module housing is arranged in the cylinder head cover interior.

The inventive cylinder head cover has the fact that the Ölabscheidevorrichtung, the first check valve, the second check valve and the vacuum relief valve are arranged in the common module housing and the module housing is arranged in the cylinder head cover interior, the advantage that they are protected against external influences, especially cold are. This reduces the risk of icing in cold weather. In addition, the arrangement of the Ölabscheidevorrichtung, the first check valve, the second check valve and the vacuum relief valve in the common module housing reduces the assembly effort and simplifies the integration of said components in the internal combustion engine. This allows for increased quality and a reduction in assembly costs. Thus, an overall reliable and space saving crankcase ventilation system is provided.

In a preferred embodiment of the cylinder head cover according to the invention, the first output channel is at least partially integrated in the cylinder head cover housing. This leads to a further reduction in the risk of icing and a further reduction in assembly costs.

In a further preferred embodiment, the second output channel is at least partially integrated in the cylinder head cover housing. As a result of the integration, a freezing of the blow-by gases in the second outlet channel can advantageously be avoided without the need for a previously required heating element. This leads to a smaller number of required components and thus to a reduced installation effort and lower installation costs.

In a further advantageous embodiment, the cylinder head cover has a camshaft cover and the module housing is connected to the camshaft cover. As a result, the free space in the cylinder head cover can be optimally used for accommodating the module housing. The module housing can be connected to the camshaft cover by means of at least one clip element and / or by means of at least one screw.

Furthermore, the cylinder head cover may have at least one Ölvorabscheidevorrichtung. By Ölvorabscheidevorrichtung with the blow-by gases blended oil can already be partially separated from the blow-by gases before they get into the at least one Ölabscheidevorrichtung.

The at least one oil separation device is formed in a preferred embodiment as a fine oil separation device. By means of Feinölabscheidevorrichtung the remaining oil components can be separated as completely as possible from the blow-by gases, so that the blow-by gases can be supplied to the engine as free of oil residues as possible.

The oil pre-separation device and / or the at least one oil separation device can be designed as inertial separators, in particular as centrifugal separators. For example, the oil pre-separation device and / or the at least one oil separation device can be designed as a cyclone separator or as a swirl separator.

The module housing has a plastic in a preferred embodiment. Furthermore, the cylinder head cover housing may comprise at least one aluminum alloy and / or an aluminum composite part with a plastic. This causes advantageously a weight reduction of said parts.

The invention further relates to a rechargeable internal combustion engine for a motor vehicle, comprising a cylinder head cover according to one of the above-mentioned embodiments, and a turbocharger having an input side and an output side.

The rechargeable combustion engine according to the invention has the advantages already mentioned in connection with the cylinder head cover according to the invention, which are not listed again at this point in order to avoid repetition.

In one embodiment, the chargeable internal combustion engine further comprises a hose, wherein the hose is connected to the second output port and to the input side of the turbocharger. The tube preferably has a length l with l ≦ 200 mm. In a further preferred embodiment, the hose has a length l with l ≦ 150 mm. The short length of the hose may reduce the risk of icing of the blow-by gases passing through the hose over known crankcase ventilation systems having relatively long hoses. In addition, external influences, which favor the aging, the wear or the damage of the hose, play a lesser role. The hose may for example comprise a plastic.

In a further embodiment, the rechargeable internal combustion engine further comprises a suction pipe, wherein the suction pipe is connected to the output side of the turbocharger and to the first output channel.

In a further embodiment, the rechargeable internal combustion engine further comprises a crankcase and a cylinder head with a cylinder head housing and with at least one duct. The at least one duct is connected to the crankcase and to the input port. As a result, the blow-by gases can be guided in a simple manner via the at least one integrated in the cylinder head duct from the crankcase to the input channel.

The invention further relates to a motor vehicle having a chargeable internal combustion engine according to one of the aforementioned embodiments.

The motor vehicle has the advantages already mentioned in connection with the cylinder head cover according to the invention or the rechargeable internal combustion engine according to the invention, which are not listed again at this point in order to avoid repetition.

Preferably, the motor vehicle is a passenger car.

The invention will now be explained in more detail with reference to the accompanying figures.

1 shows a schematic structure of a cylinder head cover of a rechargeable internal combustion engine of a motor vehicle according to an embodiment of the invention;

2 shows a schematic perspective view of a portion of the rechargeable internal combustion engine according to 1 ,

1 shows a schematic structure of a cylinder head cover 1 a partially illustrated rechargeable internal combustion engine 2 a non-illustrated motor vehicle according to an embodiment of the invention.

The cylinder head cover 1 has a cylinder head cover housing 3 and a cylinder head cover interior four on. Furthermore, the cylinder head cover 1 an oil separation device 5 , a first check valve 6 , a second check valve 7 and a vacuum relief valve 8th on. The oil separator device 5 , the first check valve 6 , the second check valve 7 and the vacuum relief valve 8th are in a common module housing 9 arranged. The module housing 9 is in the cylinder head cover interior four arranged and may for example comprise a plastic. The cylinder head cover housing 3 may comprise at least one aluminum alloy and / or an aluminum composite part with a plastic.

The module housing 9 has an inlet opening 10 for a partially illustrated input channel 11 , a first outlet opening 12 for a first output channel 13 , a second outlet 14 for a second output channel 15 and a third exit opening 16 for a third output channel 17 on.

The first output channel 13 is partially in the cylinder head cover housing 3 and a cylinder head housing 25 a cylinder head 24 integrated and leads to a suction tube 26 located on the intake side of the internal combustion engine 2 located and to the combustion chambers of the internal combustion engine 2 leads.

The second output channel 15 is in the embodiment shown completely in the cylinder head cover housing 3 integrated and leads to a hose 23 that with the second output channel 15 connected is. The hose 23 is also with an entry page 21 a turbocharger 20 the rechargeable internal combustion engine 2 connected.

The hose 23 typically has a length l with l ≤ 200 mm, more preferably l ≤ 150 mm, and consists for example of a plastic.

Schematically represented by an arrow A blow-by gases flow from an in 1 not shown crankcase of the rechargeable internal combustion engine 2 about at least one in the cylinder head 24 integrated line channel and the input channel 11 in the oil separation device 5 , There, the oil mixed with the blow-by gases is separated as completely as possible from the blow-by gases. The separated oil, which is schematically represented by an arrow C, via the third output channel 17 returned to an oil pan, not shown.

The cylinder head cover 1 can in addition to the illustrated Ölabscheidevorrichtung 5 have at least one Ölvorabscheidevorrichtung in the larger oil components are already separated before the blow-by gases in the Ölabscheidevorrichtung 5 reach. In this case, the oil separation device 5 preferably a fine oil separation device in which the remaining fine oil components are as completely as possible separated from the blow-by gases.

The thus cleaned blow-by gases, which are schematically represented by arrows B, pass through a channel 27 in the vacuum relief valve 8th and further into a canal 28 that goes toward the first check valve 6 and the second check valve 7 branches out.

Is the internal combustion engine 2 in a charged operation during load operation, is the first check valve 6 closed, there in the suction pipe 26 an overpressure is present. This is the first check valve 6 preferably designed such that it closes automatically when the internal combustion engine 2 is in load operation and in the intake manifold 26 there is an overpressure. Due to the closed first check valve 6 are the blow-by gases via the second output channel 15 and the hose 23 to the entrance page 21 of the turbocharger 20 directed. The hose can 23 For example, in an unillustrated intake pipe, which is also on the input side 21 of the turbocharger 20 is found. The blow-by gases are then in the turbocharger 20 condensed and on a starting side 22 of the turbocharger 20 about one in 1 not shown connection to the suction pipe 26 directed and thereby the internal combustion engine 2 fed again.

In a non-supercharged operation of the internal combustion engine 2 is the pressure in the suction pipe 26 less than the pressure on the input side 21 of the turbocharger 20 , The second check valve 7 is closed in this operation to a Short-circuit flow via the second output channel 15 to the internal combustion engine 2 at the turbocharger 20 to avoid passing, and the first check valve 6 is open, reducing the blow-by gases through the first output channel 13 directly into the suction pipe 26 passed and thus the internal combustion engine 2 be fed again.

The vacuum relief valve 8th , which is also referred to as "depression regulation valve", thereby ensuring a steady low negative pressure in the crankcase to prevent escape of the blow-by gases into the atmosphere.

2 shows a schematic perspective view of a portion of the rechargeable internal combustion engine 2 according to 1 , Components with the same functions as in 1 are denoted by the same reference numerals and will not be discussed further below.

In 2 the input channel, the first output channel, the second output channel and the third output channel are not shown in detail. Dashed components are located inside the cylinder head cover 1 ,

As in 2 can be seen, the cylinder head cover 1 in the embodiment shown, a camshaft cover 18 on, with the module housing 9 connected is. In this case, the module housing 9 for example by means of at least one clip element and / or by means of at least one screw with the camshaft cover 18 be connected.

Furthermore, the cylinder head cover 1 in the embodiment shown, an oil pre-separation device 19 on. The oil pre-separation device 19 For example, it is designed as a cyclone separator or a vortex separator. In the oil pre-separation device 19 Larger oil components of the blow-by gases are separated before the blow-by gases into the oil separator 5 reach.

The in the 1 and 2 arrangement shown here represents a so-called closed crankcase ventilation system (closed crankcase ventilation), in which the suction of the blow-by gases as described above is carried out under pressure. It is also conceivable to provide the arrangement according to the invention for a so-called "positive crankcase ventilation" system. In this system, a controlled, continuous or load-dependent supply of fresh air cleaned via the intake air filter takes place in the rechargeable internal combustion engine. The fresh air is added to the mixture of blow-by gas and engine oil. The system control takes place via coordinated throttles and valves. The oil separation is analogous to the oil separation in a closed crankcase ventilation system.

LIST OF REFERENCE NUMBERS

1

Cylinder head cover

2

internal combustion engine

3

Cylinder head covers housing

4

Cylinder head covers interior

5

Oil separation

6

check valve

7

check valve

8th

Under pressure relief valve

9

module housing

10

inlet opening

11

input channel

12

outlet opening

13

output channel

14

outlet opening

15

output channel

16

outlet opening

17

output channel

18

cam cover

19

Oil pre-separation device

20

turbocharger

21

input side

22

output side

23

tube

24

cylinder head

25

Cylinder head housing

26

suction tube

27

channel

28

channel

A

arrow

B

arrow

C

arrow

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008023381 A1 [0003]

Claims (15)

Cylinder head cover for a rechargeable combustion engine ( 2 ) of a motor vehicle comprising - a cylinder head cover housing ( 3 ) and a cylinder head cover interior ( four ), - at least one oil separation device ( 5 ), - a first check valve ( 6 ), - a second check valve ( 7 ), - a vacuum relief valve ( 8th ), wherein the at least one oil separation device ( 5 ), the first check valve ( 6 ), the second check valve ( 7 ) and the vacuum relief valve ( 8th ) in a common module housing ( 9 ) are arranged, wherein the module housing ( 9 ) an entrance opening ( 10 ) for an input channel ( 11 ), a first exit opening ( 12 ) for a first output channel ( 13 ), a second outlet ( 14 ) for a second output channel ( 15 ) and a third exit opening ( 16 ) for a third output channel ( 17 ) and wherein the module housing ( 9 ) in the cylinder head cover interior ( four ) is arranged. Cylinder head cover according to claim 1, wherein the first output channel ( 13 ) at least partially into the cylinder head cover housing ( 3 ) is integrated. Cylinder head cover according to claim 1 or claim 2, wherein the second output channel ( 15 ) at least partially into the cylinder head cover housing ( 3 ) is integrated. Cylinder head cover according to one of the preceding claims, wherein the cylinder head cover ( 1 ) a camshaft cover ( 18 ) and wherein the module housing ( 9 ) with the camshaft cover ( 18 ) connected is. Cylinder head cover according to claim 4, wherein the module housing ( 9 ) with the camshaft cover ( 18 ) is connected by means of at least one clip element and / or by means of at least one screw element. Cylinder head cover according to one of the preceding claims, wherein the cylinder head cover ( 1 ) at least one oil pre-separation device ( 19 ) having. Cylinder head cover according to one of the preceding claims, wherein the at least one oil separation device ( 5 ) is formed as a Feinölabscheidevorrichtung. Cylinder head cover according to one of the preceding claims, wherein the module housing ( 9 ) comprises a plastic. Cylinder head cover according to one of the preceding claims, wherein the cylinder head cover housing ( 3 ) has at least one aluminum alloy and / or an aluminum composite part with a plastic. Rechargeable internal combustion engine ( 2 ) for a motor vehicle having a cylinder head cover ( 1 ) according to one of the preceding claims and a turbocharger ( 20 ) with an input side ( 21 ) and an output side ( 22 ). Rechargeable internal combustion engine according to claim 10, further comprising a hose ( 23 ), whereby the hose ( 23 ) with the second output channel ( 15 ) and with the input side ( 21 ) of the turbocharger ( 20 ) connected is. Rechargeable internal combustion engine according to claim 11, wherein the hose ( 23 ) has a length l with l ≤ 200 mm. Rechargeable internal combustion engine according to one of claims 10 to 12, further comprising a suction pipe ( 26 ), wherein the suction tube ( 26 ) with the output side ( 22 ) of the turbocharger ( 20 ) and with the first output channel ( 13 ) connected is. Rechargeable internal combustion engine according to one of claims 10 to 13, further comprising - a crankcase, - a cylinder head ( 24 ) with a cylinder head housing ( 25 ) and with at least one duct, wherein the at least one duct with the crankcase and with the input channel ( 11 ) connected is. Motor vehicle having a rechargeable internal combustion engine ( 2 ) according to any one of claims 10 to 14.

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