WO2014079547A1

WO2014079547A1 - Internal combustion engine for a motor vehicle, and motor vehicle having an internal combustion engine of this type

Info

Publication number: WO2014079547A1
Application number: PCT/EP2013/003426
Authority: WO
Inventors: Jochen HÄFNER; Cecile Jecker
Original assignee: Daimler Ag
Priority date: 2012-11-21
Filing date: 2013-11-14
Publication date: 2014-05-30
Also published as: DE102012022700A1

Abstract

The invention relates to an internal combustion engine (10) for a motor vehicle, with at least one combustion chamber and with at least one cylinder head (12) which has at least one inlet duct (14) which opens firstly into the combustion chamber and secondly on an inlet flange surface (16) of the cylinder head (12), at least one outlet duct which opens firstly into the combustion chamber and secondly on an outlet flange surface (18) of the cylinder head (12), which outlet flange surface (18) lies opposite the inlet flange surface (16), and a longitudinal web (20) which is arranged at least partially between the inlet flange surface (16) and the outlet flange surface (18), wherein the inlet flange surface (16) and the outlet flange surface (18) are arranged in respective imaginary planes which are inclined with respect to one another and enclose an angle (a) with one another, with the result that an imaginary line of intersection (22) of the planes lies in the vertical direction above the cylinder head (12) and at least one holder (24) for an injector (26) is provided in the longitudinal web (20).

Description

Internal combustion engine for a motor vehicle and motor vehicle with such a

Internal combustion engine

The invention relates to an internal combustion engine for a motor vehicle according to the

Preamble of claim 1 and a motor vehicle with such

Internal combustion engine.

Such an internal combustion engine can be found in WO 2012/048722 A1 as known. The internal combustion engine for a motor vehicle comprises at least one combustion chamber, with at least one cylinder, and at least one cylinder head. The cylinder head has at least one inlet channel and 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. As a result, fresh gas, for example air and / or a fuel-air mixture, can be supplied to the combustion chamber via the inlet channel. The outlet channel opens on the one hand into the combustion chamber and on the other hand on an outlet flange surface lying opposite the inlet flange surface. Exhaust gas resulting from combustion can be removed from the combustion chamber via the outlet channel in the combustion chamber. Of the

Cylinder head also has an at least partially between the

Inlet flange and the Auslassflanschfläche arranged longitudinal ridge on. 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 α with one another so that an imaginary line of intersection of the planes lies in the vertical direction above the cylinder head. In the longitudinal web at least one receptacle for a spark plug for igniting a fuel-air mixture in the combustion chamber is provided. For introducing fuel directly into the combustion chamber, at least one receptacle for an injector is provided in the inlet flange surface. The injector is part of an injection system and fluidly connected to the injection system. The inlet flange surface and the

Auslassflanschfläche each have an oil chamber for an intake and exhaust valve actuation, wherein the oil chambers are each fluid-tightly sealed with a cylinder head cover. In this case, the at least one injector projects at least partially out of its receptacle and past the cylinder head cover of the inlet flange surface into the open. There is therefore an increased effort by disassembly and assembly of the injector and at least other parts of the injection system to provide access to the oil space of the inlet flange can.

It is an object of the present invention to further develop an internal combustion engine of the type mentioned and a motor vehicle with such an internal combustion engine such that a particularly easy access to the oil chamber of

Inlet flange surface is made possible.

This object is achieved by an internal combustion engine with the characteristics of

Patent claim 1 and by a motor vehicle with the features of

Patent claim 5 solved. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

To an internal combustion engine for a motor vehicle in the preamble of

Claim 1 specified type such that a particularly simple assembly of the injector is made possible on the cylinder head, it is

The invention provides that at least one receptacle for an injector is provided in the longitudinal web.

The angle α enclosed by the imaginary planes permits a particularly advantageous dimensioning of the longitudinal web, so that the receptacle can be designed accordingly and the injector can be mounted particularly easily on the longitudinal web. In particular, it is possible to design the longitudinal web in the transverse direction with a particularly advantageous width, thereby creating enough space for the recording.

At the same time, the cylinder head and thus the internal combustion engine as a whole have a particularly small space requirement due to the corresponding configuration of the cylinder head with the mutually inclined flange surfaces. In addition, the injector can be attached with only a small number of parts in the receptacle and thus at least substantially directly on the longitudinal web.

In a particularly advantageous embodiment of the invention, a distribution element, via which the injector fuel is supplied, arranged in the vertical direction of the cylinder head above the longitudinal ridge. As a result, the distribution element is particularly easy to install. In addition, an injection or fuel system needs for introducing the fuel into the combustion chamber designed as a cylinder in a maintenance and / or repair of the internal combustion engine is not necessarily dismantled, but may remain mounted on the cylinder head. This leads to the realization of particularly quick to be performed repair or maintenance.

The direct attachment of the injector on the recording on the cylinder head and an addition of, for example, production-related tolerances can be avoided, resulting in a particularly simple and cost-effective production of the internal combustion engine. In particular, this makes it possible to position the injector particularly precisely relative to the cylinder head, which leads to a precise injection of fuel into the combustion chamber.

In a particularly advantageous embodiment of the invention, the receptacle is formed as a longitudinal extension direction having through opening which is completely closed over its entire longitudinal extension direction in the circumferential direction. In other words, the passage opening is only in their

Open longitudinal direction, so that the injector inserted from a first side into the through hole and can inject the fuel into the combustion chamber via the second, the first side opposite side. In all other, at least substantially perpendicular to the longitudinal direction extending directions, the through hole is closed over its entire longitudinal extension direction and thus fluid-tight, so that no additional sealing elements for

Sealing the through hole provided and needed. The injector can thus be arranged, for example without additional sealing to an oil chamber of the cylinder head, since due to the corresponding configuration of

Through hole no leaks can occur. As a result, with respect to tolerances insensitive installation of the injector is possible in the internal combustion engine according to the invention. In addition, the effort to realize a

Seal against the oil chamber omitted.

Advantageously, a longitudinal extension direction of the injector in the mounted state on the cylinder head extends at least substantially in the vertical direction of the cylinder head and thus vertically, so that a particularly simple installation of a vertical injector is realized. For this purpose, it is provided, for example, that extends the longitudinal direction of the passage opening in the vertical direction of the cylinder head and thus the internal combustion engine. To realize a particularly small space requirement, it is provided in a particularly advantageous embodiment of the invention that the injector is at least predominantly included in the recording. Preferably, the injector is completely received in the receptacle.

The invention also includes a motor vehicle, in particular a passenger car, with an internal combustion engine according to the invention. As a result of the corresponding

Embodiment of the internal combustion engine, this can be made particularly simple, resulting in a simple and cost-effective production of the entire motor vehicle. Due to the small space requirement of the invention

Internal combustion engine can also package problems in the invention

Motor vehicles kept low and / or avoided.

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 sectional view of a reciprocating

Internal combustion engine trained internal combustion engine for one

Motor vehicle, with a cylinder head, which is designed as a so-called Delta cylinder head and an at least substantially triangular cross-section with a between a

Inlet flange and an outlet flange arranged

Longitudinal web has, in which a receptacle for an injector for introducing fuel into a combustion chamber of the internal combustion engine is provided; and

2 shows a detail of a schematic and sectioned perspective view of the internal combustion engine. Fig. 1 shows a fragmentary sectional view of a generally designated 10 internal combustion engine for driving a passenger car, which is presently designed as a reciprocating internal combustion engine. The internal combustion engine 10 includes a plurality of combustion chambers in the form of cylinders, which by a

Cylinder crankcase are formed. The internal combustion engine 10 also includes a cylinder head 12, which can be seen in detail in FIG

Cylinder crankcase is connected.

Each of the cylinders is associated with at least one inlet channel 14 of the cylinder head 12. Fresh gas, for example in the form of air, can flow into the respective cylinder via the inlet channels 14. For this purpose, the respective inlet channel 14 opens on the one hand into the respective cylinder and on the other hand on an inlet flange surface 16, which is partially visible in FIG. An intake module, not shown in FIGS. 1 and 2, can be fastened to the cylinder head 12 via the inlet flange surface 16. The

Intake module serves to guide the fresh gas to the inlet channels 14. In other words, the fresh gas from the intake module can flow into the inlet channels 14 and flow from the inlet channels 14 into the respective cylinder.

The cylinders are each associated with at least one outlet channel of the cylinder head 12. An outlet channel is not shown in detail in the figures. About the

Exhaust ports, exhaust gas can be removed from the respective cylinder. For this purpose, the respective outlet channel opens on the one hand into the respective cylinder and on the other hand on an outlet flange surface 18 which can be seen in FIG. 2 and which is arranged opposite the inlet flange surface 16. About the Auslassflanschfläche 18 can a

Exhaust module, such as an exhaust manifold, are attached to the cylinder head 12, so that the effluent from the cylinders and the exhaust ports flowing exhaust gas can flow into the exhaust module. By means of the exhaust module, the exhaust gas is discharged from the internal combustion engine 10.

Furthermore, the cylinder head 12 in each case has a valve actuation, not shown in the figures, for the inlet channel 14 and the outlet channel. The valve actuation for the intake passage 14 is provided in an oil chamber 19 in the cylinder head 12. The oil chamber 19 is closed by means of a cylinder head cover, not shown, from the environment. The cylinder head cover forms with the inlet flange 16 a sealing compound. Accordingly, for the exhaust passage, a valve actuation in provided its own oil room, which is also closed with its own cylinder head cover.

As can be seen from FIG. 2, the cylinder head 12 has a central web 20 arranged between the inlet flange surface 16 and the outlet flange surface 18, which extends in the longitudinal direction of the cylinder head 12 and thus of the internal combustion engine 10 and is therefore also referred to as a longitudinal web. Furthermore, it can be seen from FIG. 2 that the inlet flange surface 16 and the outlet flange surface 18 are arranged in respective imaginary planes, wherein the planes are inclined relative to each other and include a first angle α with each other such that an imaginary cutting line 22 of the two planes in through Directional arrow 25 indicated high direction of the cylinder head 12 and thus the internal combustion engine 10 is above the cylinder head 12.

The cylinders are each assigned a receptacle 24, which is provided in the longitudinal web 20. The receptacle 24 serves in this case for receiving an injector 26, by means of which fuel in the respective corresponding cylinder is directly injectable. In other words, the respective injector 26 is completely accommodated in the corresponding receptacle 24 in the present case and is fastened directly to the cylinder head 12 via the receptacle 24. As a result of the direct attachment of the injector 26 and the injectors 26 on the cylinder head 12, a tolerance insensitive installation of the injectors 26 is created.

The longitudinal web 20 can be dimensioned correspondingly advantageous and designed in particular in the transverse direction sufficiently wide to provide sufficient space for the

Recording 24 to create and as a result the injector 26 particularly easy to mount in the receptacle 24 and thus on the cylinder head 12 can.

As can be seen in particular from FIG. 2, as a result of the corresponding configuration of the inlet flange surface 16 and the outlet flange surface 18, the cylinder head 12 has an at least essentially triangular cross section, so that the cylinder head 12 at least substantially corresponds to the shape of the Greek capital letter Delta (Δ). having. Therefore, the cylinder head 12 also becomes a delta cylinder head

designated. Due to this configuration of the cylinder head 12, a very compact design of the cylinder head 12 is created so that it has only a very small

Has space requirements. As can be seen from FIGS. 1 and 2, the respective receptacle 24 is shown as having a direction of elongation indicated by a directional arrow 28

Passage opening 30 is formed, whose longitudinal direction (direction arrow 28) in this case corresponds to the vertical direction (directional arrow 25) of the cylinder head 12 and extends vertically or vertically when standing on a horizontal plane passenger cars. In addition, the through hole 30 is over its entire

Longitudinal direction completely closed in the circumferential direction.

This means that the passage opening 30 in its longitudinal direction, i. Thus, in the vertical direction, is open only up and down, while it is closed in all other directions and thus fluid-tight. As a result, the effort to seal the receptacle 24, be kept particularly low or even eliminated. In particular, it is not intended and not necessary to seal the receptacle 24 against an oil chamber of the cylinder head. The passage opening 30 opens only on a first side 32 corresponding to the corresponding cylinder and on one of the first side 32 opposite, second side 34 to the

Environment if it is not covered, for example, by the cylinder head. Thereby, the injector 26 can be inserted in a particularly simple manner in the vertical direction from above into the receptacle 24 and secured in this.

The internal combustion engine 10 also includes a distribution element 36, which in the present case is at least substantially tubular and usually also as

Fuel rail of a known common rail injection system is called. The distribution element 36 has a fuel channel 38 for receiving fuel. Furthermore, the distribution element 36 has respective connection elements 40 for the respective injectors 26. This means that the injectors over the

Connection elements 40 can be fluidly connected to the distribution element 36, so that the fuel received in the fuel passage 38 via the

Connection elements 40 can be supplied to the respective injector 26.

Thus, the fuel from the fuel passage 38 can flow into the respective injectors 26 so that they can inject the fuel into the combustion chambers. The distribution element 36 is in this case the injectors 26 in common, so that all the injectors 26 are fed by the distribution element 36 with fuel. In FIGS. 1 and 2, an injection jet 42 of the respective injector can be seen, which in the present case is at least substantially conical. By the at least substantially direct and thus tolerant insensitive

Attachment of the injectors 26 on the cylinder head 12, these can also be particularly precisely aligned relative to the cylinder head and relative to the respective cylinder, so that the fuel can be injected into the cylinder very precisely. This benefits the combustion in the cylinders. Furthermore, the injectors 26 can be mounted with only a very small number of parts.

Claims

claims

Internal combustion engine (10) for a motor vehicle, with at least one combustion chamber, with at least one cylinder and with at least one cylinder head (12), which has at least one inlet channel (14), on the one hand into the combustion chamber and on the other hand, on an inlet flange surface (16) of the cylinder head (16). 12), at least one outlet channel, which opens on the one hand into the combustion chamber and, on the other hand, on an outlet flange surface (18) of the cylinder head (12) opposite the inlet flange surface (16) and at least partially between the inlet flange surface (16) and the outlet flange surface (18). disposed

Longitudinal ridge (20), wherein the inlet flange (16) and the

Outlet flange surface (18) are disposed in respective imaginary planes which are inclined relative to each other and enclose an angle (a) with each other such that an imaginary line of intersection (22) of the planes lies in the vertical direction above the cylinder head (12),

characterized in that

in the longitudinal web (20) at least one receptacle (24) for an injector (26) is provided and a distribution element (36), via which the injector (26) fuel is supplied, in the vertical direction of the cylinder head (12) above the longitudinal web (20) is arranged.

Internal combustion engine according to claim 1,

characterized in that

the receptacle (24) as a one longitudinal direction having

Through opening (30) is formed, which over its entire

Longitudinal direction is completely closed in the circumferential direction. Internal combustion engine (10) according to claim 1 or 2,

characterized in that

the injector (26) is received at least predominantly in the receptacle (24).

4. Motor vehicle with an internal combustion engine (10) according to one of the preceding claims.