EP1715168A1 - Integrated injection system - Google Patents

Abstract

The engine has an injection system (2), which is arranged in the inner region of a cylinder head (1) i.e. between a oil chamber (4) of the head and intake channels (3), such that the injection system is quasi integrated in the head. The injection system is connected with a hood. The hood is connected with intake channels, so that these serve for intake air guidance, where the channels are manufactured as one piece with the head.

Description

The invention relates to an internal combustion engine with a cylinder head according to the preamble of claim 1.

The EP 0 445 355 B1 relates to an apparatus and method for casting cylinder heads for internal combustion engines, and more particularly to core assemblies and elements, casting methods using such core assemblies and elements, and products of these methods, as well as an apparatus having cylinder heads for internal combustion engines.

The core assembly includes an inlet core having a plurality of core support and positioning surfaces, a coolant jacket core provided for insertion into the core assembly, the coolant jacket core having a plurality of core positioning portions provided to connect to a plurality of core support members. or positioning of the inlet core for supporting and positioning the coolant jacket core to engage the inlet core. However, the core assembly also includes an outlet core adapted for insertion into the core assembly, the outlet core having a plurality of core positioning portions provided to engage a plurality of core support and positioning surfaces of the inlet core for supporting and positioning the core Outlet core on the inlet core, and further comprising a plurality of elongated, Auslaßkern forming portions which extend through the coolant jacket core, the inlet core further having a plurality of elongated, inlet-forming portions which extend through the coolant jacket core when the coolant jacket core in the core assembly is inserted. The coolant jacket core, the outlet core and the inlet core are each one-piece cores and positioned by their core support and positioning exactly to each other.

The method is intended to provide a one-piece coolant jacket core, a one-piece outlet core, and a one-piece inlet core, wherein the one-piece coolant jacket core, one-piece outlet core and one-piece inlet core are interleaved to be supported and positioned against one another by cut surfaces.

The cylinder head casting has a long cylinder block closing portion for closing a plurality of cylinders formed in a block of an internal combustion engine and providing an air inlet and an air outlet. The cylinder block closing portion has a plurality of spaced head portions provided to close the plurality of cylinders in the block. The cylinder block closing portion further forms a plurality of air intake passages transverse to the long cylinder block closing portion and communicating with the plurality of spaced head portions, and forming a cylinder head side portion and an air intake manifold cavity extending along the cylinder head casting extends between the plurality of transverse air intake passages and the side of the cylinder head casting.

The DE 198 01 171 C1 discloses a fuel injection device for a consisting of the crankcase, cylinder head and cylinder head cover multi-cylinder internal combustion engine, with stuck in receiving holes in the cylinder head and projecting into the combustion chamber of the engine to be supplied fuel injection valves and with a fuel injection valves and shielded by a housing part distribution strip. The housing part is an outer and the cylinder head cover adjacent shielding. The distributor strip accommodated in the shielding part is connected to the end regions of the fuel injection valves. The longitudinal side wall of the cylinder head has, for a part of each fuel injection valve that is exposed from the receiving bore, exhaust nichelike indentations.

It is known that the injection system is attached laterally from the outside to the cylinder head or to an intake pipe. Here, the injection system is often located in a crash area of a motor vehicle and therefore must be increased Meet requirements for strength and ductility. To meet these requirements, the injection system is extremely expensive from metallic components, such. As steel or aluminum assembled. The materials used also have a relatively high thermal conductivity, so that it may come to a fuel vapor bubble formation in the injection system.

In addition, the hood, in particular a valve cover or a valve cover with integration elements such as an intake system and the injection system in an extremely cost-intensive manner are designed as completely separate modules. An assembly of these two assemblies is extremely cumbersome and very expensive.

The US 5,533,485 discloses a fuel injection system for internal combustion engines with a high-pressure fuel pump, which promotes fuel from a low-pressure chamber in a high-pressure accumulator, which is connected via high pressure lines with projecting into the combustion chamber of the fuel to be supplied fuel injectors. The high-pressure accumulation chamber is formed by a high pressure-resistant distribution strip, which is integrated in the wall of a cylinder head cover arranged on the internal combustion engine (valve cover).

The US 4,757,789 discloses a distribution strip attached to a valve cover. For fastening a plurality of screws is used, so that the distribution bar is sufficiently rigid and with sufficient resistance to vibration on the valve hood attached.

The invention has for its object to improve an internal combustion engine of the type mentioned with simple means to the effect that the injection system is crash-protected, the engine should be cheaper to produce at the same time.

The object is achieved by an internal combustion engine with the features of claim 1.

It is advantageous that the cylinder head is designed with its inlet ports such that the injection system between the intake ports and a cylinder head oil space is mountable, so that the injection system is arranged in a crash-protected interior

With the favorable arrangement of the injection system in the interior of the cylinder head between the cylinder head oil space and the intake ports are all critical, gasoline-carrying components crash-protected within the rigid cylinder head structure. The injection system is virtually integrated in the cylinder head, which is surrounded on the one hand by the rigid or rigid cylinder head oil space and on the other hand by the rigid inlet channels. Thus, the increased requirements for deformability can be omitted, which allows a much more cost-effective production.

It is favorable if the inlet ducts are produced in one piece with the cylinder head and are oriented in a direction away from the hood relative to a central axis. Expediently, the injection system has at least one injection nozzle and a supply strip, wherein the injection nozzle is arranged in an associated inlet channel. The injection nozzle is preferably arranged with respect to a central axis at an acute angle, preferably at an angle of 15 °, in the inlet channel.

The injection system is preferably arranged on a "cold side" of the internal combustion engine, namely the inlet side, and can be favorably formed from a plastic. A suitable plastic advantageously has a lower thermal conductivity than metal, so that the injection system heats up less quickly than in an embodiment of metal. This low heating advantageously reduces fuel vapor bubble formation in the injection system.

In a preferred embodiment of the internal combustion engine, it is favorable in the context of the invention, when the injection system is so connected to the hood that a one-piece component for mounting is formed.

This embodiment is based on the finding that a common assembly of metal would be conceivable, but for cost and weight reasons is not desirable. Therefore, a common assembly, consisting of hood and injection system is preferably made of a plastic according to the invention.

Advantageously, this common assembly can be arranged with its injection system in the crash-protected inner region between the intake ports and the cylinder head oil space. In this case, the hood can, inter alia, take over the function of the intake air duct from an intake air collector to the cylinder head side intake duct.

Appropriately, the hood with the injection system, preferably positively frictionally connected to the supply rail, in particular latched or screwed. It is also conceivable that the hood with the injection system, preferably integrally connected to the supply strip, in particular glued and / or welded. In a further embodiment, it is possible that an upper part of the injection system, in particular an upper part whose supply strip is integrated into the hood, wherein a lower part of the injection system, in particular its supply strip separately connectable to the hood, for example screwed, locked, glued and / or welded is. The hood itself can be configured in one piece or in several parts. In addition, it is conceivable that the injection system, preferably the supply rail with the hood is made in one piece.

Fig. 1

eine perspektivische Aufsicht auf einen Zylinderkopf,

Fig. 2

eine perspektivische Seitenansicht auf den Zylinderkopf aus Fig. 1,

Fig. 3

einen Querschnitt durch eine Haube mit einem Einspritzsystem,

Fig. 4

einen Querschnitt gemäß Figur 3 mit einer Verbindungsvariante,

Fig. 5

einen Querschnitt gemäß Figur 3 mit einem zweiteiligem Einspritzsystem,

Fig. 6

einen Querschnitt durch ein einteiliges Bauelement, und

Fig. 7

eine perspektivische Frontansicht des Zylinderkopfes aus Figur 2.

Further advantageous embodiments of the invention are disclosed in the subclaims and the following description of the figures. Show it:

Fig. 1

a perspective view of a cylinder head,

Fig. 2

3 a perspective side view of the cylinder head from FIG. 1,

Fig. 3

a cross section through a hood with an injection system,

Fig. 4

a cross section according to Figure 3 with a connection variant,

Fig. 5

a cross section according to Figure 3 with a two-part injection system,

Fig. 6

a cross section through a one-piece component, and

Fig. 7

a front perspective view of the cylinder head of Figure 2.

In the different figures, the same parts are always provided with the same reference numerals, so that these are usually described only once, with the figures 1, 2 and 7 are intended to serve a special representation of a crash-protected interior.

FIG. 1 shows a cylinder head 1 of an internal combustion engine. In the illustrated embodiment, a four-cylinder internal combustion engine is shown, wherein the individual cylinders are arranged in series. The cylinder head 1 is associated with an injection system 2, which will be explained in more detail below. With the cylinder head 1, a hood 21, not shown in Figure 1 is connected, which will be explained in more detail below. The cylinder head 1 is designed with its intake ports 3 such that the injection system 2 between the intake ports 3 and a cylinder head oil chamber 4 can be mounted.

The inlet ducts 3 are made in one piece with the cylinder head 1 and, based on a central axis X, are directed away from it in the direction of the hood. In the illustrated embodiment, the inlet channels 3 are pulled to "outside" and bent upwards. It can clearly be seen in FIG. 2 that the inlet channels 3 run quasi in accordance with a quadrant section.

The injection system 2 has at least one injection nozzle 6 and an unillustrated supply strip 23 (FIGS. 3 to 6). Since in the illustrated embodiment, a four-cylinder in-line engine is shown, is also each Inlet channel 3 corresponding to an injection nozzle 6 assigned. The injection nozzle 6 is arranged with respect to the central axis X at an acute angle, preferably at an angle of 15 °, in the inlet channel 3. The supply rail 23 supplies each of the injectors 6 with fuel which is injected into the intake passage 3. The supply bar 23 is described in more detail below as the hood 21 below.

For receiving the injection nozzles 6 3 receptacles 7 are arranged in the respective inlet channel.

Due to the advantageous arrangement and design of the intake ports 3, as can be clearly seen in Figures 1 and 2, between the intake ports 3 and the cylinder head oil space 4 a crash-protected inner region 8 is formed. In this inner region 8, the injection system 2 is arranged. Advantageously, the injection system 2 is thus arranged on a "cold side" of the internal combustion engine and that on its inlet side.

On a side 13 opposite the control side 9, a bulkhead 14 for closing the inner region 8 is provided on the last inlet channel 3 relative to the control side 9. Thus, the injection system 2 is quasi integrated in the cylinder head 1 and enough crash-protected. Between the respective inlet channels 3, viewed in the longitudinal direction of the cylinder head 1, in each case a reinforcing wall 15 can be arranged, which additionally protects the crash-protected inner area 8 (FIG. 7). In the wall 15 openings 20 for cooling the cylinder head 1 and / or the liquid drain of possibly accumulating liquid, such as water may be introduced. Of course, such a wall may also be provided between the wall 11 adjacent to the inlet channel 3 and the wall 11 itself, which may also have the aforementioned openings, wherein in the wall 11, of course, no opening is provided. The openings 20 are made relatively large in the illustrated embodiment, and can of course be made smaller than shown.

FIG. 2 shows a perspective side view of the cylinder head 1. In contrast to FIG. 1, here the injection system 2, the timing chain channel 12 and the bulkhead 14 are not shown in order to be able to represent the design of the interior region 8 more clearly. FIG. 2 shows a gearwheel 16 arranged on the control side 9, which shows a camshaft 17 with cams 18 arranged thereon. The cams 18 serve to control respective valves.

In the illustration chosen in FIGS. 1 and 2, spark plugs 19 are each offset laterally, as seen in the longitudinal direction of the cylinder head 1, with each spark plug 19 associated with each intake port 3 or combustion chamber.

In Figures 1 and 2, a four-cylinder in-line engine with two valves per combustion chamber is shown. The invention is of course not limited to this embodiment, so that internal combustion engines with more or fewer cylinders, or other cylinder arrangements are ausgestaltetbar, which is also conceivable to use instead of a timing chain other Steuertrieb- or valve train concepts. In particular, it should be noted that the advantageous embodiment can also be used in internal combustion engines having more valves in each combustion chamber.

FIG. 3 shows a cross section through the above-mentioned hood 21 with an associated injection system 2. The injection system 2 has the supply strip 23 and the injection nozzle 6 arranged thereon. The injection system 2 and the hood 21 are separate components, which are positively frictionally connected to each other, preferably latched, so that a one-piece component for mounting is formed. The supply strip 23 is seen in cross-section as a hollow duct with an example circular wall 24 configured, the duct seen in cross section, of course, can have any other meaningful design. The wall 24 are associated on both sides latching elements 26 which engage in counter-locking means 27 which are incorporated in the hood 21. The locking elements 26 are seen in cross-section L-shaped with an L-web 28 and a perpendicular thereto arranged L-leg 29 configured. With his L-bridge 28, the respective latching element 26 is connected to an outer circumference of the wall 24. At a free end 31 of the L-leg 29 is seen in cross-section approximately mushroom-shaped locking head 32 which cooperates with its locking edges 33 with corresponding locking surfaces of the counter-locking means 27. The counter-locking means 27 are designed as movable rods 34, so that they initially dodge at a latching with the locking elements 26 to then spring back to their original position, the locking edges 33 engage behind the locking surfaces kraftformschlüssig. In this position, the injection system 2 is sufficiently connected to the hood 21.

FIG. 4 shows a further embodiment of a possible connection of the hood 21 to the injection system 2. In contrast to the connection shown in FIG. 3, a force-locking screw connection is shown in FIG. On the wall 24, an extension 36 is arranged on both sides, in which a passage opening for a screw 37 is introduced. The screw 37 is screwed into complementary threaded holes. The tapped holes are made in lands which extend between the bars 34 so that the bars 34 are substantially rigid.

Figure 5 shows a further embodiment for connecting the hood 21 with the injection system 2. The injection system 2 is designed with its supply strip 23 in two parts. Here, an upper part 38 of the supply strip 23 is made in one piece with the hood 21, wherein a lower part 39 of the supply strip 23 is made separately, wherein the lower part 39, the injection nozzle 6 is associated. In the connection of the upper part 38 with the lower part 39, so the connection of the lower part 39 with the hood 21, the supply bar 23 is formed. The supply strip 23 is seen in this embodiment with its duct in cross-section oval designed. The connection between the two parts 38 and 39 can be made with mutually corresponding connection surfaces 41. Conceivable here is a screw, snap, adhesive or welded connection, wherein in Figure 5 by way of example an adhesive bond is shown.

FIG. 6 shows a component made entirely in one piece and consisting of the injection system 2, in particular its supply strip 23 and the hood 21.

The hood 21 may be referred to as a valve cover, which is connected in the embodiments according to Figures 3 to 6 with the inlet channel 3. The hood 21 can thus u.a. take over the function of the intake air guide from an intake air collector, not shown, to the cylinder head side intake port 3.

Claims (5)

Combustion engine with a cylinder head (1) to which an injection system (2) is assigned, wherein a hood (21) can be connected to the cylinder head (1) and wherein the injection system (2) can be connected to the hood (21) in such a way is formed for mounting one-piece component
characterized in that
the hood (21) is connected to inlet ducts (3) so as to serve for the intake air duct, the inlet ducts (3) being made in one piece with the cylinder head (1). Internal combustion engine according to claim 1,
characterized in that
the hood (21) frictionally engaged with the injection system (2), preferably with its supply strip (23) is connected. Internal combustion engine according to claim 1,
characterized in that
the hood (21) is materially connected to the injection system (2), preferably connected to its supply strip (23). Internal combustion engine according to claim 1,
characterized in that
the hood (21) is formed integrally with the injection system (2), preferably with its supply strip (23). Internal combustion engine according to one of claims 1 to 4,
characterized in that
the component is formed from a plastic.

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