WO2014079522A1

WO2014079522A1 - Internal combustion engine for a motor vehicle

Info

Publication number: WO2014079522A1
Application number: PCT/EP2013/002948
Authority: WO
Inventors: Normann Freisinger; Jochen HÄFNER; Cecile Jecker
Original assignee: Daimler Ag
Priority date: 2012-11-24
Filing date: 2013-10-01
Publication date: 2014-05-30
Also published as: DE102012022942A1

Abstract

The invention relates to an internal combustion engine (10) for a motor vehicle, said engine comprising at least one combustion chamber (14) and having a cylinder head (16), which has an accommodating chamber (30) for accommodating, at least in certain regions, an actuation device for actuating at least one gas exchange valve assigned to said combustion chamber (14). The engine also comprises at least one cylinder head hood (36), which is connected to the cylinder head (16) and by means of which at least certain regions of the accommodating chamber (30) are closed, and at least one turbine housing (40) for accommodating a turbine wheel of a turbine of an exhaust gas turbocharger, wherein said turbine housing (40) is integral with said cylinder head housing (36).

Description

Daimler AG

Internal combustion engine for a motor vehicle

The invention relates to an internal combustion engine for a motor vehicle according to the preamble of patent claim 1.

Such internal combustion engines are well known for example as reciprocating internal combustion engines from the series production of motor vehicles. Such an internal combustion engine has at least one combustion chamber, in particular in the form of a cylinder. The internal combustion engine also includes a cylinder head, which has a receiving space for at least partially

Receiving an actuator. The actuating device serves to actuate at least one gas exchange valve assigned to the combustion chamber.

For actuating the gas exchange valve, the actuating device comprises, for example, a camshaft, which is coupled to an output shaft, in particular a crankshaft, of the internal combustion engine and can be driven by it. Other actuators for actuating the gas exchange valve are well known from the general state of the art.

The internal combustion engine further comprises a cylinder head cover connected to the cylinder head, by means of which the receiving space at least

partially closed. In other words, the cylinder head cover serves to at least partially cover or cover the receiving space.

Finally, at least one turbine housing of a turbine of an exhaust gas turbocharger of the internal combustion engine is provided. The turbine housing serves for the

Picking up a turbine wheel. Exhaust gas from the combustion chamber can be fed to the turbine wheel, so that the turbine wheel can be driven by the exhaust gas as a result of this supply. For example, a compressor of the exhaust gas turbocharger is coupled to the turbine. Of the Compressor includes a compressor wheel which is drivable by the turbine wheel. As a result, energy contained in the exhaust gas can be used to compress air to be supplied to the internal combustion engine by means of the compressor. As a result, an efficient and thus fuel-efficient operation of the internal combustion engine can be realized.

DE 10 2009 020 100 A1 discloses a cylinder head for an internal combustion engine as known. It is provided a first sealing surface of the cylinder head, via which the cylinder head is connected to a cylinder head cover. In addition, a suction module and an exhaust module are provided, each having a

corresponding sealing flange surface are connected to the cylinder head. The

Sealing surface between the cylinder head and the cylinder head cover is integrated into the respective Dichtflanschfläche the suction module and / or the exhaust module.

EP 2 333 277 A2 discloses an exhaust manifold for at least one cylinder in a crankcase of an internal combustion engine having a cylinder head. In the

Exhaust manifold is one piece and the same material a turbine housing one

Exhaust gas turbocharger integrated.

The conventional internal combustion engines have a high number of parts, resulting in a high assembly cost. Furthermore, the high number of parts leads to a high weight of the internal combustion engine, since respective mounting means are used for the separate and to be assembled components of the internal combustion engine.

It is therefore an object of the present invention to develop an internal combustion engine for a motor vehicle, in particular a passenger car, of the type mentioned in such a way that a particularly low number of parts and a particularly low weight of the internal combustion engine can be realized.

This object is achieved by an internal combustion engine for a motor vehicle, in particular a passenger car, having the features of patent claim 1. Advantageous embodiments with appropriate and non-trivial

Further developments of the invention are specified in the remaining claims.

To an internal combustion engine for a motor vehicle, in particular a

Passenger car, the specified in the preamble of claim 1 type such that only a very small number of parts and a particular low weight of the internal combustion engine, it is

According to the invention provided that the turbine housing integral with the

Cylinder head cover is formed. In other words, the cylinder head cover and the turbine housing of the exhaust gas turbocharger in a common component of the

Combustion engine summarized. As part of the production of

Internal combustion engine thus takes place the assembly of the turbine housing together with the assembly of the cylinder head cover, so that the internal combustion engine as a whole is particularly time-consuming and inexpensive to produce. In addition, for the assembly of the cylinder head cover and for the assembly of the turbine housing, the same, i. the turbine housing and the cylinder head cover common mounting means are used. As a result, the number of mounting means can be kept low, which benefits the low weight of the internal combustion engine.

The cylinder head cover and the integrally formed with this turbine housing represent a modular component, which is pre-assembled or pre-assembled and

according to the pre-assembled state can be mounted time and cost on the cylinder head. As a result of the one-piece design, it is also possible to dispense with a heat protection element which is usually to be provided, in particular a heat sheet, so that the number of parts and the weight of the internal combustion engine can be further reduced. In addition, the turbine housing and thus the

Exhaust gas turbocharger be positioned as a result of the one-piece design of the cylinder head cover with the turbine housing particularly close to the cylinder head. This has the consequence that the cylinder head cover and / or the turbine housing can be formed with only a very small wall thickness.

In an advantageous embodiment of the invention, the turbine housing and the

Cylinder head cover made of a light metal or a light metal alloy, in particular aluminum, in particular an aluminum alloy formed.

This allows a particularly low weight of the cylinder head cover and the

Turbine housing and the internal combustion engine to be realized in total.

It has proven particularly advantageous if at least one coolant channel for receiving a coolant, in particular a liquid coolant, is provided in the turbine housing. This makes it possible to gas-conducting areas of the

To cool turbine housing in a simple and space-saving way with only a very small number of parts. As the coolant is a liquid coolant, which Usually referred to as cooling water is used, it can be realized by a particularly high cooling performance.

In a particularly advantageous embodiment of the invention, the coolant channel of the turbine housing with at least one further, provided in the cylinder head coolant passage is fluidly connected. As a result, the coolant can flow from the cylinder head into the turbine housing or vice versa. The supply of the coolant channels with the coolant is thus realized in a particularly simple manner with only a very small number of transfer points. In particular, it is possible both

Supply coolant channels with coolant via at least one coolant connection common to the cylinder head and the turbine housing, so that respective ones are provided

Coolant connections for the turbine housing on the one hand and for the cylinder head on the other hand can be avoided.

If the cylinder head is designed, for example, as a cast component in the course of a casting process, at least one casting core being used to produce the cylinder head, so-called core bearing caps on the cylinder head can be avoided by this fluidic connection of the coolant channels. By means of such core bearing cover usually provided on the cylinder head cavities as the other

Coolant channel closed to the environment, so as to avoid an undesirable leakage of coolant from the other coolant channel to the environment.

However, since now the further coolant channel with the coolant channel of the

Turbine housing is fluidically connected and thus a transfer point for the

Coolant represents, the additional coolant channel must not be closed. As a result, compared to conventional cylinder heads at least one

Core storage lid can be saved.

In a further advantageous embodiment of the invention, the

Cylinder head cover an exhaust part with at least one exhaust passage for guiding exhaust gas from the internal combustion engine to the turbine wheel. In other words, the exhaust passage of the exhaust part is fluidly connected to a receiving space for receiving the turbine wheel. The exhaust passage is fluidly connected to at least one outlet channel of the cylinder head that is fluidically connected to the combustion chamber. The exhaust passage serves to exhaust the exhaust gas from the combustion chamber and supply it to the exhaust gas passage. It is provided a first sealing surface between the cylinder head cover and the cylinder head. About this first sealing surface of the receiving space for the turbine wheel is sealed to the environment of the cylinder head. Furthermore, a second sealing surface is provided between the cylinder head and the exhaust part. About this second sealing surface of the outlet channel is sealed to the environment of the cylinder head.

To a particularly simple installation of the cylinder head cover and thus of the

Turbine housing and the exhaust part to realize the cylinder head, it is provided that the first sealing surface and the second sealing surface are arranged in a common plane. An offset arrangement of these sealing surfaces, i. an arrangement of the sealing surfaces in spaced-apart planes would lead to a relatively complex assembly of the cylinder head cover and the turbine housing on the cylinder head, which can be avoided by the arrangement of the sealing surfaces in a common plane.

In a further advantageous embodiment of the invention, the cylinder head has at least one inlet channel and the at least one outlet channel. The inlet channel opens on the one hand into the combustion chamber and on the other hand on an inlet flange surface of the

Cylinder head. The outlet channel opens on the one hand into the combustion chamber and on the other hand on an outlet flange surface opposite the inlet flange surface

Cylinder head. The Auslassflanschfläche can, for example, the second

Cover sealing surface or vice versa. For example, an intake module can be connected to the cylinder head via the inlet flange surface so that air flowing through the intake module can flow into the inlet channel. About the inlet flange surface of the inlet channel is sealed to the environment of the cylinder head.

In this case, the inlet flange surface and the outlet flange surface are arranged in respective imaginary planes, which are inclined relative to one another and enclose an angle with one another so that an imaginary line of intersection of the planes in the vertical direction of the internal combustion engine lies above the cylinder head. The cylinder head thus has an at least substantially triangular shape, at least in a partial region. Thus, at least in this subarea, the cylinder head resembles the shape of the Greek capital letter Delta (Δ). Therefore, the cylinder head is also referred to as delta cylinder head. This configuration of the cylinder head leads to a particularly low space requirement of the cylinder head and the

Total internal combustion engine. In addition, the intake module and the cylinder head cover can be easily mounted. Furthermore, it can be provided in this embodiment that the first sealing surface between the cylinder head cover and the cylinder head is integrated in the inlet flange between the cylinder head and the intake module and / or in the Auslassflanschfläche.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features mentioned above in the description and

Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in others

Combinations or alone, without departing from the scope of the invention.

The drawing shows in:

1 shows a detail of a schematic cross-sectional view of a

Internal combustion engine of a motor vehicle, with a cylinder head cover and with a turbine housing, wherein the cylinder head cover is formed integrally with the turbine housing; and

Fig. 2 is a schematic perspective view of the cylinder head cover with in the

Cylinder head cover integrated turbine housing.

FIG. 1 shows, in a schematic cross-sectional view, an internal combustion engine for a motor vehicle, denoted as a whole by 10. The

Internal combustion engine 10 comprises a very schematically illustrated in Fig. 1 crankcase 12, on which a not visible in Fig. 1 output shaft is rotatably mounted in the form of a crankshaft about an axis of rotation relative to the crankcase 12. The crankcase 12 also has a plurality of combustion chambers in the form of cylinders of the internal combustion engine 10, wherein of these cylinders in Fig. 1, a designated 14 cylinder is recognizable.

In the cylinder 14, a corresponding and not visible in Fig. 1 piston translationally relative to the cylinder 14 is movably received. The piston is over one Connecting rod pivotally connected to the crankshaft. About this articulated connection, the translational movements of the piston can be converted into a rotational movement of the crankshaft about the axis of rotation.

During operation of the internal combustion engine 10, this air sucks from the environment, which flows into the cylinder 14 via an intake module (not shown in FIG. 1). The air is combusted in the cylinder 14 together with fuel, resulting in exhaust gas of the internal combustion engine 10 results.

With the crankcase 12 a in Fig. 1 fragmentary recognizable cylinder head 16 is connected. The cylinder head 16 has respective ones with the respective cylinders

corresponding outlet channels, of which in Fig. 1, a designated 18 outlet channel can be seen. The outlet channel 18 opens on the one hand into the cylinder 14 and on the other hand on an outlet flange 20 of the cylinder head 16. The exhaust gas can flow from the cylinder 14 into the outlet channel 18, whereby the exhaust gas can be discharged via the outlet channel 18 from the cylinder 14.

The cylinder head 16 also has an inlet flange surface 22 opposite the outlet flange surface 20. While the outlet flange surface 20 is arranged on a so-called outlet side 24, via which the exhaust gas is discharged from the internal combustion engine 10, the inlet flange surface 22 is arranged on an inlet side 26 opposite the outlet side 24. On the inlet side, the sucked air is supplied to the cylinder 14. About the inlet flange 22, the not visible in Fig. 1 intake module with the cylinder head 16 is connected or

connected.

To supply the sucked air to the cylinder 14, the cylinder head 16 has at least one inlet channel corresponding to the cylinder 14. The inlet channel opens on the one hand in the cylinder 14 and on the other hand at the

Inlet flange surface 22.

As can be seen from Fig. 1, the inlet flange 22 and the

Auslassflanschfläche 20 disposed in respective imaginary planes which are inclined relative to each other and an angle α include each other, so that an imaginary line of intersection 28 of the planes in the vertical direction of the internal combustion engine 10 above the cylinder head 16 is located. In the present case, the cylinder head 16 has at least substantially the shape of the Greek capital letter Delta (Δ). The cylinder head 16 has a receiving space 30 for at least partially receiving an actuating device for actuating at least one gas exchange valve assigned to the inner space. The receiving space 30 is presently arranged on the outlet side 24 and serves to receive an actuating element in the form of an exhaust camshaft of the actuating device. In the present case, the gas exchange valve is an outlet valve which can be actuated by means of the exhaust camshaft. As part of this operation, the exhaust valve is opened from a closing position fluidly obstructing the outlet channel 18 relative to the cylinder 14 in an open position fluidically connecting the outlet channel 18 with the cylinder 14 against a Federkraftbeaufschlagung caused by a spring element. After actuation, the exhaust valve from its open position by means of

Federkraftbeaufschlagung moved back into the closed position.

The cylinder head 16 also has a further receiving space 32. Of the

Receiving space 32 is arranged on the inlet side 26 and serves for receiving a further actuating element in the form of an intake camshaft of a further actuating device. By means of the intake camshaft, at least one inlet valve assigned to the cylinder 14 can be actuated. By actuating the inlet valve by means of the inlet camshaft, the inlet valve is caused to flow from a closed position, which fluidly obstructs the inlet channel relative to the cylinder 14, into an open position fluidically connecting the cylinder 14 to the inlet channel, counter to a spring force application caused by a spring element. After the operation is the

Inlet valve moved by the Federkraftbeaufschlagung from the open position back into the closed position.

As can be seen from Fig. 1, the cylinder head 16 has a central web 34 as a partition. The receiving spaces 30, 32 are separated by means of the central web 34 from each other at least partially.

The internal combustion engine 10 also includes a cylinder head cover 36. The cylinder head cover 36 is connected to the cylinder head 16. By means of

Cylinder head cover 36, the receiving space 30 to the environment 38 of the cylinder head 16 is closed. In other words, the cylinder head cover 36 is used to close the receiving space 30. As a result, the exhaust camshaft accommodated in the receiving space 30 is protected. In addition, it can be avoided that a lubricant, such as lubricating oil, for lubricating the

Exhaust camshaft from the receiving space 30 to the environment 38 exits. The internal combustion engine 10 further includes a turbine housing 40 of a turbine of an exhaust gas turbocharger. The turbine housing 40 has a

Recording room 42 on. In the receiving space 42, a turbine wheel of the turbine about a rotational axis relative to the turbine housing 40 is rotatably receivable. The

Turbine housing 40 has at least one feed channel 44 which extends

For example, extends in the circumferential direction of the turbine wheel over its circumference spirally and therefore usually also referred to as a spiral channel. As can be seen from Fig. 1, the turbine housing 40 is formed integrally with the cylinder head cover 36. In other words, the cylinder head cover 36 and the

Turbine housing 40 combined to form a one-piece component. As a result, a particularly small number of parts of the internal combustion engine 10 and a particularly simple assembly of these can be realized.

The cylinder head cover 36 also includes an exhaust member 46 having at least one

Exhaust gas channel 48 on. The exhaust passage 48 is fluidly connected to the exhaust passage 18, so that the exhaust gas flowing through the exhaust passage 18 from the cylinder 14 can flow from the exhaust passage 18 into the exhaust passage 48. The exhaust passage 48 is fluidly connected to the supply passage 44, so that the exhaust gas flowing through the exhaust passage 48 can flow into the supply passage 44 and further to the turbine wheel.

As a result of this supply of the exhaust gas to the turbine wheel, the exhaust gas can

Drive turbine wheel. The turbine wheel is rotatably connected to a shaft of the exhaust gas turbocharger. The exhaust gas turbocharger also has a compressor with a

Compressor housing in which a compressor wheel is rotatably received about an axis of rotation relative to the compressor housing. The axis of rotation of the compressor wheel coincides with the axis of rotation of the turbine wheel. The compressor wheel is rotatably connected to the shaft, so that the compressor wheel from the turbine wheel

can be driven. By means of the compressor wheel can the

Internal combustion engine 10 to be supplied compressed air, so that the

Internal combustion engine 10 is particularly efficient and operable with only very low fuel consumption.

Between the cylinder head cover 36 and the cylinder head 16, a first sealing surface 50 is provided, via which the receiving space 30 is sealed against the environment 38. In addition, between the cylinder head 16 and the exhaust part 46, a second sealing surface 52 is provided, via which the outlet channel 18 is sealed against the environment 38. In this case, the sealing surfaces 50, 52 in a common plane arranged, wherein in this plane and the Auslassflanschfläche 20 is arranged. As a result, the cylinder head cover 36 and the turbine housing 40 can be mounted particularly easily on the cylinder head 16, wherein they are supported on the cylinder head 16 via the sealing surfaces 50, 52.

2 shows a schematic perspective view of the cylinder head cover 36 and the turbine housing 40 integrally formed with the cylinder head cover 36. The one-piece design of the cylinder head cover 36 with the turbine housing 40 creates a module component designated as a whole by 54, which is preassembled in a simple and cost-effective manner Cylinder head 16 can be mounted.

As can be seen from a combination of FIGS. 1 and 2, a so-called exhaust flange 56 is formed by the exhaust part 46, via which the modular component 54 can be connected to the cylinder head 16 in the region of the outlet channel 18. In order to keep the weight of the modular component 54 and thus of the internal combustion engine 10 as a whole particularly low, the modular component 54 is formed, for example, from aluminum, in particular an aluminum alloy.

In addition, at least one coolant channel is provided in the turbine housing 40, which can be flowed through by a preferably liquid coolant. Thereby, exhaust gas-conducting portions of the turbine housing 40 can be cooled effectively and efficiently.

LIST OF REFERENCE NUMBERS

10 internal combustion engine

12 crankcase

14 cylinders

16 cylinder head

18 exhaust duct

20 outlet flange area

22 inlet flange area

24 outlet side

26 inlet side

28 Straight

30 recording room

32 more recording room

34 middle jetty

36 Cylinder head cover

38 environment

40 turbine housing

42 recording room

44 feed channel

46 exhaust part

48 exhaust duct

50 first sealing surface

52 second sealing surface

54 module component

56 Exhaust flange

α angle

Claims

claims

1. internal combustion engine (10) for a motor vehicle, with at least one

Combustion chamber (14), with a cylinder head (16) having a receiving space (30) for at least partially receiving an actuator for actuating at least one gas exchange valve associated with the combustion chamber (14) with at least one connected to the cylinder head (16)

Cylinder head cover (36), by means of which the receiving space (30) is closed at least partially, and with at least one turbine housing (40) for receiving a turbine wheel of a turbine of an exhaust gas turbocharger, characterized in that

the turbine housing (40) is formed integrally with the cylinder head cover (36).

2. internal combustion engine (10) according to claim 1,

characterized in that

the turbine housing (40) and the cylinder head cover (36) are formed of a light metal, in particular aluminum.

3. internal combustion engine (10) according to any one of claims 1 or 2,

characterized in that

in the turbine housing (40) is provided at least one coolant channel for receiving a coolant, in particular a liquid coolant.

4. internal combustion engine (10) according to claim 3,

characterized in that

the coolant channel of the turbine housing (40) is fluidically connected to at least one further coolant channel provided in the cylinder head (16). Internal combustion engine (10) according to one of the preceding claims, characterized in that

the cylinder head cover (36) has an exhaust part (46) with at least one exhaust passage (48) for guiding exhaust gas of the internal combustion engine (10) to the exhaust gas passage

Turbine wheel, wherein the exhaust passage (48) with at least one fluidically connected to the combustion chamber (14) exhaust passage (18) of the cylinder head (16) is fluidly connected, and wherein a first, between the cylinder head cover (36) and the cylinder head (16) provided sealing surface (50), via which the

A receiving space (30) against the environment (38) of the cylinder head (16) is sealed, and a second, between the cylinder head (16) and the exhaust part (46) provided sealing surface (52) via which the outlet channel (18) against the

Environment (38) is sealed, arranged in a common plane.

Internal combustion engine (10) according to one of the preceding claims, characterized in that

the cylinder head (16) at least one inlet channel, on the one hand in the

Combustion chamber (14) and on the other hand on an inlet flange (22) of the

Cylinder head (16) opens, and at least one outlet channel (18), on the one hand in the combustion chamber (14) and on the other hand on an inlet flange (22) opposite Auslaßflanschfläche (20) of the cylinder head (16) opens, wherein the inlet flange (22 ) and the outlet flange surface (20) are disposed in respective imaginary planes which are inclined to each other and enclose an angle (a) with each other such that an imaginary line of intersection (28) of the planes is located above the cylinder head (16) in the vertical direction.