EP2063094B1 - Moulded component for a combustion engine - Google Patents

Abstract

The cast cylinder-crankcase (1) for a motor vehicle internal combustion engine has a separate fluid guide duct (5,5d) cast into it. The duct can be to supply oil to a crankcase or camshaft bearing. There can be multiple fluid feed ducts forming a branched fluid feed channel. The ducts can have curved sections. There can be a separate feed duct to the cylinder head.

Description

The invention relates to a cast component for an internal combustion engine, wherein the component is a cylinder crankcase having at least one guide channel, which is formed in the form of a tube and molded during casting of the component and which forwards a fluid medium to a demand site wherein the fluid medium is oil.

Internal combustion engines, in the form of internal combustion engines, are an integral part of vehicles (for example cars and commercial vehicles, ships, etc.) and are also used as stationary engines. In this regard, internal combustion engines include numerous molded components having at least one guide channel (also called a supply line) which relays a fluid medium (e.g., oil, water gas, or other liquid or gaseous media) to a demand site in the engine or adjacent areas. Some of the guide channels can also be used to cool a component itself. Where needed are the locations where the particular medium is needed, e.g. bearings to be lubricated, areas to be cooled, etc.

A guide channel or a plurality of guide channels comes / come especially in a cylinder crankcase or adjacent thereto add-on parts. Guide channels are introduced in a known manner by mechanical processing on machine tools or transfer lines, ie drilled. These are done in several elaborate, high-precision work steps Central main ducts and sidetracking channels, which make junctions to individual needs sites, are drilled into the component. Subsequently, numerous, unnecessary accesses must be closed permanently and safely. Very long, linear guide channels, such as those of the main oil passage in a cylinder crankcase are today even occasionally poured by pouring a pipe or by saving by a corresponding casting core.

From the DE 199 61 092 A1 It is known to pour in a cast cylinder block or cylinder head of an internal combustion engine during manufacture as pipes preformed cooling channels with a small diameter. These lead around components such as spark plugs or fuel injection nozzles and form a cooling system for the liquid cooling of the internal combustion engine. The DE 33 00 924 C2 teaches for water cooling of webs between closely and directly cast cylinders of a cylinder block of a water-cooled internal combustion engine in the web forming casting material pour tubes, which establish a connection between the lateral Kühlwassermänteln the cylinder block. This results in intensive cooling of the highly stressed web areas.

The JP 59 079019 A discloses a cylinder crankcase with a main oil channel cast in as a tube. The tube extends over the housing length, is mostly exposed and is stored in the casting material of the bulkheads. Starting from the crankshaft bearings run in the bulkheads holes to the cast-in tube, which are subsequently introduced mechanically into the cylinder crankcase. In engine operation, lubricant flows from the main oil passage through the bores to the crankshaft bearings.

In the JP 63 143708 U a cylinder crankcase miL is described with an oil supply for the piston cooling, which includes numerous holes, which are subsequently introduced mechanically into the casting. The main oil channel is realized as a bore and runs in a housing wall. For the piston cooling numerous oblique holes are provided in the housing, which have also been subsequently introduced mechanically into the casting. They each terminate with their one end in a cylinder space and with their other end disposed in the region of the crankshaft bearings in a drilled lubricant supply passage connected to the main oil passage. In engine operation, lubricant that has not been taken up in the crankshaft bearings, passes out of the bearing area via the oblique holes in the cylinder chambers to lubricate the cylinder walls and to cool the piston.

The invention is based on the object in a component - namely a cylinder crankcase - the above-mentioned type to reduce manufacturing and cost.

This object is achieved according to the invention in a cast component of the type mentioned above by the characterizing features of claim 1.

According to the invention, the cast component is a cylinder crankcase. A cylinder crankcase has numerous guide channels, especially for oil and water, so that by pouring a guide channel or more guide channels, which is or in each case designed as a tube, a considerable saving in manufacturing effort is achieved. In the case of a single guide channel cast in as a pipe, this is not the main oil channel, since this belongs to the state of the art. Object of the invention it is rather, (possibly next to the pouring of the main oil passage as a pipe) to pour another guide channel or more other channels for oil or other media to need as a pipe (e). As an essential guide channel to need points in a cylinder crankcase, which can be realized according to the invention in the form of a cast-in tube, the supply line for the piston cooling is called. As a further essential guide channels to need in a cylinder crankcase, which can be advantageously realized in the form of cast-in tubes, for example, the oil supply to crankshaft or camshaft bearings, the pressure oil line to the cylinder head or oil returns to call.

Furthermore, at least one guide channel can be cast as a pipe in the cylinder crankcase, which forms a fuel line.

Pouring a prefabricated pipe as a guide channel has over the mechanical introduction by drilling the advantage that the guide channel does not need to be straight (as drilling), but can be adapted to the required contour of the component with the respective desired bends. In contrast, in the straight-line drilling of a guide channel according to the prior art inevitably machining paths must be made that are not useful to supply the need site. Furthermore, a bore has an access to the outside, which must be subsequently closed again, which can lead to leakage problems. Such disadvantages and problems do not occur in a cast in the form of a corresponding prefabricated or molded tube guide channel.

Another advantage of the invention is that a cast-pipe guide channel or more cast-pipe guide channels offers a high degree of cleanliness on the inner channel wall and the cavity unlike the prior art free from residues due to mechanical introduction of the channel or free of casting residues (eg core residues) due to a pouring of the channel into the component as a cavity by inserting is a kernel.

This aspect is particularly important in a guide channel for bearing lubrication, as in the channel possibly remaining residues with the oil during engine operation in the camp and would lead to the destruction of the bearing.

In addition, in contrast to a drilled guide channel, in which only circular cross-sections are feasible, it is possible to introduce the channel with almost any desired cross-sectional shape and thereby optimize the course and the supply. Furthermore, by suitable choice of the cross-sectional shape and the strength of the component wall, in which the guide channel is cast, can be reduced, resulting in a weight reduction of the component.

Of course, it is possible to provide on the same component one or more according to the invention cast as a tube guide channels and one or more introduced in a conventional manner guide channels.

In the cylinder crankcase according to the invention according to claim 1, at least one guide channel is cast as a tube, which forms an oil supply line for the supply of the piston cooling or lubrication of the cylinder wall. In the invention, the at least one cast-in as a duct guide channel is arranged such that it extends partially or completely exposed, in some cases, ie it can extend outside of the component on the outside or inside. Locally the On the other hand, the guide channel must be looped around with casting material of the component in order to ensure a firm bond between the channel and the component. The guide channel may be completely exposed (based on its longitudinal extent) or may be partly cast in the component wall. The measure of the partially exposed course offers over the prior art in which the drilled or cast with cores guide channels can extend only in the wall of the component, the advantage that the wall thickness of the component can be significantly reduced and thereby saved on material and weight ,

For saving labor, it is advantageous if a plurality of pistons or cylinders are supplied by a common oil supply from. For this purpose, the oil supply can be suitably designed and arranged such that it extends in the longitudinal extension of the cylinder crankcase and branch off several spray nozzles, the oil directed each injected into a cylinder space below a piston head, thereby cooling the piston crown on the one hand and lubricated on the other the respective cylinder wall becomes. Of course, it is also possible for a plurality of oil supply lines to be cast into a cylinder or to a plurality of cylinders, possibly with other progressions.

Depending on the cast cylinder crankcase, it may be appropriate to provide only a single cast as a pipe guide channel on the component. Advantageously, the component comprises a plurality of cast guide channels in order to save manufacturing and cost. In an advantageous variant, the guide channels can be introduced in each case as a single connecting tube for the medium guide. This means that when pouring several individual, correspondingly shaped tubes are cast as connecting parts with. This provides a high degree of freedom in terms of the course of the guide channels. According to In another alternative advantageous variant, the cast-in guide channels are realized by a branched pipe system. For this purpose, several pipes to a pipe system are connected to each other (eg welded) before pouring and then the pipe assembly has been cast with. A combination of guide channels in pipe composite form and individual connecting parts on the same component is possible and advantageous.

According to an advantageous embodiment of the invention, the cylinder crankcase at least one cast-in as a tube guide channel, which forms a fuel line for the supply of a fuel pump. The fuel line advantageously extends in the longitudinal extension of the cylinder crankcase in the region of a housing outer wall. In an advantageous development, a plurality of fuel lines are cast as tubes, e.g. at least one supply line and at least one return line.

According to an advantageous development of the invention, the at least one cast-in guide channel has different cross-sectional shapes in its course. As a result, a good adaptation to the respective construction of the component is achieved. For example, narrow contour areas can be overcome. The respective cross-sectional shapes to be realized depend on the particular construction of the component. Different cross-sectional shapes on a tube can be removed prior to pouring e.g. realize by hydroforming of the tube.

According to an advantageous embodiment of the invention, the component is made of a metallic material or plastic. Likewise, advantageously, the at least one cast guide channel made of a metallic material or plastic. As metallic materials such as steel, all cast iron materials, light metals, non-ferrous metals come into question. Which material is to be preferably used in particular also depends, inter alia, on the particular component to be cast.

Of course, according to the invention trained and arranged cast-in tubes can be realized as a guide channels in an attachment of a cylinder crankcase - in particular in a cylinder head, a gear housing, a gear housing, an oil pan or the like. In this case, guide channels in the cylinder crankcase or in the / the attachment (s) can be supplied by a common or multiple supply circuits.

A method for producing a cast component for an internal combustion engine, wherein the component is a cylinder crankcase having at least one guide channel which forwards a fluid medium to a demand site, provides that a tube is used to form the at least one guide channel is incorporated with the desired course in a mold required for casting or introduced into a casting core or incorporated into a lost model or in the molding medium cavity filling and then the component is poured with the casting method to be used in each case.

In this case, the tube can also be incorporated in several casting cores, which can be mounted as individual cores to form a core block.

Through this casting concept, it is possible to produce a cylinder crankcase with at least one cast-pipe guide channel, but also other components such as attachments for the Cylinder crankcases (eg cylinder head, gearbox housing, wheel housing, oil sump, etc.) are advantageous to realize. Depending on whether the at least one guide channel is to be completely cast into the component wall or completely or partially exposed, the einzugießende pipe is installed in the mold (possibly by means of supports) or introduced into the casting core (eg injected into a sand core or in the Core manufacturing incorporated with) or incorporated into a lost model or directly embedded in the loose mold medium cavity filling, or the tube is mounted at a pipe end in the casting core. When introducing a tube into the casting core, certain areas must be exposed again in order to produce a firm cast connection with the component. After casting with the particular casting method to be used, the cast blank is removed from the mold, cores or loose molding medium are removed, and the usual post-processing measures are carried out.

A cast component according to the invention can be manufactured with different casting methods. According to a first advantageous variant of the method, the component is cast in a casting process with lost shape, for example in a pure core molding process, a Kernform- iVm green mold process, Kernform- iVm cold resin molding process, etc. According to a second advantageous method variant, the component in a Continuous casting process, eg mold casting, die casting, injection molding, etc. In a third preferred variant, the component is cast in the lost foam process. Advantages of the Lost Foam casting process (a form of full-cast casting) are, for example, the lack of core residues on the cast component, the high surface quality, high-quality contour definition and great imaging accuracy, and thus a relatively low reworking effort.

If the component is to have a plurality of cast-in guide channels, the tubes required for this purpose can preferably be introduced as individual connecting tubes. It may also be advantageous to connect a plurality of tubes to a corresponding pipe system, to position the prefabricated pipe system in the casting mold, core, etc., and then to pour it with. Furthermore, it may be advantageous in some variants to connect a plurality of tubes in each case to a partial tube system and to pour several partial tube systems into the component. Which variant is preferable depends on the specific task.

Fig. 1

einen ausschnittsweisen Querschnitt aus einem Zylinderkurbelgehäuse nach dem Stand der Technik,

Fig. 2

einen ausschnittsweisen Längsschnitt zu Fig. 1 (Stand der Technik),

Fig. 3

einen ausschnittsweisen Querschnitt aus einem Zylinderkurbelgehäuse gemäß einem ersten Beispiel eines ersten Zylinderkurbelgehäuse-Typs,

Fig. 4

einen Längsschnitt zu Fig. 3 entsprechend Y-Y,

Fig. 5

einen ausschnittsweisen Querschnitt aus einem Zylinderkurbelgehäuse,

Fig. 6

einen Längsschnitt zu Fig. 5 entsprechend X-X,

Fig. 7

ein einzelnes Verbindungsrohr als einzugießender Führungskanal für ein Zylinderkurbelgehäuse,

Fig. 8

ein einzugießendes Rohrsystem für ein Zylinderkurbelgehäuse,

Fig. 9

einen ausschnittsweisen Querschnitt aus einem Zylinderkurbelgehäuse gemäß einem zweiten Beispiel des ersten Zylinderkurbelgehäuse-Typs,

Fig. 10

einen erfindungsgemäßen zweiten Zylinderkurbelgehäuse-Typ in schematischer Ansicht von unten,

Fig. 11

einen dritten Zylinderkurbelgehäuse-Typ in einem ausschnittsweisen Querschnitt,

Fig. 12a

einen vorteilhaften vierten Zylinderkurbelgehäuse-Typ in einem ausschnittsweisen Querschnitt,

Fig. 12b

einen ausschnittsweisen Längsschnitt entsprechend A-A aus Fig. 12a und

Fig. 13

ein weiteres Zylinderkurbelgehäuse in einem ausschnittsweisen Querschnitt.

In the drawings, cylinder crankcases are shown schematically. Show it:

Fig. 1

a partial cross-section of a cylinder crankcase according to the prior art,

Fig. 2

a partial longitudinal section to Fig. 1 (State of the art),

Fig. 3

1 is a fragmentary cross-sectional view of a cylinder crankcase according to a first example of a first type of cylinder crankcase;

Fig. 4

a longitudinal section to Fig. 3 according to YY,

Fig. 5

a partial cross-section of a cylinder crankcase,

Fig. 6

a longitudinal section to Fig. 5 according to XX,

Fig. 7

a single connecting tube as einzugießender guide channel for a cylinder crankcase,

Fig. 8

a einzugießendes pipe system for a cylinder crankcase,

Fig. 9

12 is a fragmentary cross-sectional view of a cylinder crankcase according to a second example of the first cylinder crankcase type;

Fig. 10

a second cylinder crankcase type according to the invention in a schematic view from below,

Fig. 11

a third type of cylinder crankcase in a fragmentary cross section,

Fig. 12a

an advantageous fourth cylinder crankcase type in a fragmentary cross section,

Fig. 12b

a partial longitudinal section corresponding to AA Fig. 12a and

Fig. 13

another cylinder crankcase in a fragmentary cross-section.

In the in Fig. 1 In the section shown cast component, here a cylinder crankcase 1, according to the prior art, a crankshaft bearing 2 and a camshaft bearing 3 and a main oil passage 4 (a main guide channel) are shown in cross section. Furthermore, longitudinally cut guide channels 5a, 5b can be seen which run from the main oil channel 4 to the crankshaft bearing 2 or camshaft bearing 3 and provide during engine operation for the lubrication of camshaft and crankshaft bearings. The outgoing from the camshaft bearing 3 guide channel 5c leads to an attachment of the cylinder crankcase 1, in this case to a cylinder head, not shown. The illustrated guide channels 5a, 5b, 5c are subsequently introduced into the cast cylinder crankcase 1, ie drilled. Therefore, only a straight course of the guide channels 5 is possible, and the housing 1 has manufacturing-related access 6 to the outside (to recognize left), which are to be closed later.

In Fig. 2 is the main oil channel 4 off Fig. 1 cut longitudinally, and there are several of them branching guide channels 5b, which lead to bearings 3 for the camshaft to recognize. Furthermore, recesses 22 in the contour region of the cylinder crankcase 1 shown. Corresponding recesses 22 are also in the Fig. 4 and 6 to recognize.

Fig. 3 shows a cast component for an internal combustion engine having at least one guide channel 5, which forwards a fluid medium to a demand site. And it is a cylinder crankcase 1. The cutting position corresponds to that of Fig. 1 ,

Evident is a guide channel 5d, which has been formed in the form of a tube and poured in during casting of the cylinder crankcase 1 with. The single connecting tube 7, which is cast in as a guide channel 5d, is bent here in a "handle-like manner". - Of course, a guide channel 5 d also have a different shape or a different course than shown. In this case, from one bend 8, a section 7a extends to a crankshaft bearing 2 and another section 7b to a camshaft bearing 3. The bend 8 is located at the point where the main oil channel 4, which in this embodiment is drilled in a conventional manner is subsequently introduced, will run. When introducing the main oil channel 4 by drilling the cast-in connecting pipe 7 is pierced and thereby the connection of the guide channel 5 d made to the main oil passage 4. In engine operation oil passes from the main oil passage 4 via the sections 7a, 7b of the guide channel 5d or connecting tube 7 to the respective crankshaft bearing 2 and camshaft bearing 3. The reaching into the camshaft bearing 3 and the crankshaft bearing 2 ends of the guide channel 5d are due to casting and are removed in the context of post-processing. The guide channel 5c to the cylinder head is introduced by drilling in this embodiment.

In the longitudinal section in Fig. 4 It can be seen that in the illustrated cylinder crankcase 1 a plurality of individual connecting pipes 7 are cast as guide channels 5 for the media guide, in the bulkheads 23. The "handle-like" connecting pipes 7 shown here open at one end in each case in a camshaft bearing 3 and (interrupted through the drilled main oil passage 4) with the other end in a crankshaft bearing 2.

Of course, it is also possible, instead of a bent connecting pipe, e.g. pour two separate tubes, one opening into a crankshaft bearing and the other into a camshaft bearing. Furthermore, it is also possible to supply only one or more camshaft bearings via a pipe guide channel or a plurality of pipe guide channels with oil and to supply the crankshaft bearings in a conventional way by mechanically introduced channels. Accordingly, one or more crankshaft bearings can be supplied with oil via a tube guide channel or a plurality of tube guide channels, and the camshaft bearings can be supplied by mechanically introduced channels in the conventional way.

In the in the FIGS. 5 and 6 illustrated cylinder crankcase 1, the main oil passage 4 and the guide channels 5 are formed to the camshaft bearings 3 and crankshaft bearings 2 as cast-in tubes, and this is realized by a branched, cast-pipe system 9. For this purpose, pipes with the appropriate dimensions (length, diameter, cross-sectional shape, etc.) have been connected before casting to a pipe system 9, which has subsequently been poured in a suitable casting process.

In the Fig. 3 to 6 can not be seen that the cast-in as tubes guide channels 5 is not completely of casting material be surrounded, ie run in the component, must, but can also be partially exposed. Furthermore, the guide channels 5 may also have a curved, adapted to the contour course course.

Fig. 7 shows a connecting tube 7 for a "suitcase handle" guide channel 5d in different views. The to be recognized core supports 10 serve the lateral support during the casting process. However, it is also possible to do without core supports 10, for example, if the ends of the connecting tube 7 are anchored sufficiently firmly in casting cores.

Fig. 8 shows an example of a pipe system 9. From a main guide channel 9a branch off several secondary ducts 9b, which lead to the individual needs and supply them with the appropriate medium.

At the in Fig. 9 illustrated crankcase 1 are - according to the first example of the Fig. 3 and 4 - Several individual, "suitcase-like" connecting pipes 7 have been poured as a guide channels 5d during casting of the housing. About the sections 7a, 7b while the crankshaft bearing 2 and the camshaft bearing 3 are supplied from the subsequently introduced by drilling main oil passage 4, which intersects the connecting pipes 7, respectively, with lubricant. In contrast to the first example, here the guide channels 5c to the cylinder heads are not subsequently bored in the cylinder crankcase 1, but also realized in the form of casting the housing with cast-in pipes, whereby advantageously an additional post-processing step is saved on the casting. A connecting pipe 7 and a pipe for the formation of the guide channel 5c have been connected to each other before pouring.

Of course, a guide channel 5c to the cylinder head also branch off from a connecting pipe 7 at a location other than shown. It is also possible that a guide channel 5c is not fed via a connecting pipe 7 with lubricant, but directly from the drilled main oil passage 4 (eg, by pouring into the formation of guide channels 5c for supplying the cylinder heads separate, correspondingly positioned pipes). Furthermore, the leading to the cylinder heads, designed as a cast-in tubes guide channels 5c part of a cast-pipe system (corresponding to that in the FIGS. 5 and 6 Example shown) and branch off either directly from the tubular main oil passage 4 or sub-guide channels 9b. In addition, a tubular guide channel 5c not branch off from the main oil passage 4, a connecting pipe 7, a secondary guide channel 9b, etc., but in the area of a bearing (here, for example, the camshaft bearing 3, but other bearings are possible) in a groove of a bearing ring and from There are lubricants supplied.

Fig. 10 shows a cylinder crankcase 1 according to the invention as a cast component for an internal combustion engine. Laterally visible oil sump connection surfaces 14 to which an oil sump is fastened. The cylinder crankcase 1 has at least one guide channel 5e, which forwards a fluid medium to a point of need, is formed in the form of a pipe and is cast in during the casting of the cylinder crankcase 1. In the case of the cylinder crankcase 1 according to the invention shown here, the guide channel 5e cast in as a tube forms an oil feed line 11 for the piston cooling, ie it conducts oil as a fluid medium to a point of need. The oil supply line 11 ends here via a recess 21 on an end face 15 of the cylinder crankcase 1 and is from an oil pump supplied with oil. Of course, lubricant could be fed into the oil supply line 11 at another point of the oil circuit within the cylinder crankcase 1.

In the exemplary embodiment shown, several cylinders 12 are advantageously supplied by a common oil feed 11. For this purpose, the cast-in pipe guide channel 5e is arranged in the longitudinal extension of the cylinder crankcase 1, ie transversely to the cylinders 12. He runs here in the area of the crank chambers at the lower cylinder areas at a certain distance from the Zylinderaußenwandungen. It can be seen that the guide channel 5e is adapted to the shape of the cylinder 12, so that there is a "wave-like" curved course. The oil supply line 11 is formed in the embodiment substantially exposed. In several places it is locally looped with casting material of the component. These Gußhalterungen 13 cause a solid composite of oil supply 11 and component. The Gußhalterungen 13 here form the mounting points for the spray nozzles, not shown. The spray nozzles are subsequently introduced mechanically into the oil feed line 11 and in each case designed and arranged such that they inject lubricant directed into a cylinder space under a piston crown. This cools the pistons and lubricates the cylinder walls.

As in Fig. 10 to recognize the Gußhalterungen 13 are advantageously provided on the Zylinderaußenwardungen.

Due to the curved, adapted course of the oil supply line 11 for the piston cooling and by their predominantly exposed, only locally surrounded by casting material training is compared to the known, straight drilled in the casting material oil supply lines achieved a significant weight reduction of the component and saving on mechanical processing effort.

Of course, the oil supply line 11 could also have a different course or another arrangement. Furthermore, several guide channels 5e, which form oil supply lines 11 for the piston cooling, could also be cast. If necessary, the oil supply line 11 could also advantageously have different cross-sectional shapes in their course.

Fig. 11 shows a cylinder crankcase 1 as a cast component for an internal combustion engine, which has at least one guide channel 5f, which forwards a fluid medium to a demand site, formed in the form of a tube and cast in the casting of the cylinder crankcase 1 with. In the case of the cylinder crankcase 1 shown here, the guide channel 5f cast in as a tube forms a pressure oil line 16 to a cylinder head.

The cast as a pipe pressure oil line 16 is supplied directly here by a main oil passage 4 with lubricant. By the subsequent drilling of the main oil passage 4, the connection of the guide channel 5f is made to the oil circuit in the cylinder crankcase 1 shown. Alternatively, the pressure oil line 16 could be fed from another area of the oil balance within the cylinder crankcase 1 by, for example, before being poured into the cylinder crankcase with another oil-carrying line has been connected to a composite pipe (see. Fig. 9 ) or by opening into a groove of a bearing. Numerous other advantageous variants are possible.

Due to an obstacle 17 - shown by way of example in the example shown, a threaded bore 18 and another recess 19 - has the cast as a tube guide channel 5f adapted to the contour course course and here "curved" bent. Of course, depending on structural conditions other forms of variation are possible. The pressure oil line 16 is completely surrounded here in longitudinal extension with casting material. Alternatively, it could, depending on the design conditions, advantageously also be arranged such that it runs partially or completely exposed in parts. Furthermore, it could advantageously have different cross-sectional shapes in its course, e.g. To overcome bottlenecks in the cylinder crankcase 1.

The appropriate number of cast as a pipe pressure oil lines 16 for the oil supply of the cylinder head and the cylinder heads on the cylinder crankcase 1 depends on the respective assembly of the engine.

The realization of the cylinder head oil supply in the form of a cast-in pipe or several cast-in pipes is very advantageous for the designer, since he his oil supply not straight - as in the case of mechanical introduction by drilling - but bent and thus can bring adapted to the spatial conditions.

The Fig. 12a and 12b show yet another advantageous cylinder crankcase 1 as a cast component for an internal combustion engine, which has at least one guide channel 5g, which forwards a fluid medium to a demand site, formed in the form of a tube and is molded during casting of the cylinder crankcase 1 with. This cast in as a pipe Guide channel 5g forms a fuel line 24 for the supply of a fuel pump with fuel as a fluid medium. Due to the curved line 25 is in Fig. 12a indicated that the representation of the cast-in fuel line 24 is located in a different sectional plane than the rest of the drawing.

It can be seen that here advantageously several guide channels 5g are each cast as a tube in an outer wall 26 of the cylinder crankcase 1, and that they extend in the longitudinal extension of the cylinder crankcase 1 (vg1. Fig. 12b ). Here, in the example shown, the middle fuel line 24 is a fuel supply line and the outer fuel lines 24 are each a fuel return line. Of course, other numbers of cast-in lines or other assignments of the lines are possible. Furthermore, in Fig. 12a a recess 27 shown in the later a fuel pump is used. As in the partial longitudinal section in Fig. 12b can be seen, a plurality of recesses 27 are provided for fuel pumps over the length of the central fuel line 24, wherein the number depends on the number of cylinders of the respective engine.

In the course of finishing operations on the cast component, the fuel supply line is cut or severed in each case in the areas of the recesses 27 for the fuel pumps, thereby producing the connections between the guide channel 5g and pumps. Openings in the fuel return lines are later also mechanically introduced. By a fuel pump each fuel is removed from the supply line and pumped through a connection line to an injection nozzle in a cylinder head.

According to the prior art, fuel lines are mechanically introduced into the outer wall of a cylinder crankcase as long, straight holes. The pouring of one or more fuel pipe (s) as a pipe with said manufacturing method offers the advantageous possibility that the guide channel, if necessary, can be bent. It may advantageously be exposed predominantly or in sections, may not also have round cross-sectional shapes or have different cross-sectional shapes in its course. Thereby, e.g. a reduction in the component wall thickness possible, resulting in savings in material and weight and reduced manufacturing costs. Furthermore, the course of the lines can be optimized. Since the fuel line (s) 24 are already integrated in the finished cast component, the workload is also significantly reduced overall.

In the in Fig. 12a and 12b shown embodiment of an advantageous cylinder crankcase 1 can be seen that only the fuel lines 24 are poured as tubes into the housing here. The running in a bulkhead 23 guide channels 5a, 5b for the supply of camshaft bearing 3 and crankshaft bearing 2 with oil and a supply channel 5c to the cylinder head are here introduced later mechanically by drilling.

The above-described inventive and advantageous embodiments of the four cylinder crankcase types - namely a) oil supply of crankshaft bearings or camshaft bearing by several cast-in as a tube guide channels (see. Fig. 3 . 4 and 7 ), b) oil supply for the piston cooling by at least one guide channel cast in as a pipe (cf. Fig. 10 ), c) oil supply of the cylinder head or the cylinder heads by at least one cast-in as a duct guide channel (see. Fig. 9 . 11 ), d) providing a fuel line through at least one guide channel cast in as a tube (cf. Fig. 12 ) - Can be advantageously realized in an appropriate combination of the same cylinder crankcase.

An example of such an advantageous combination shows Fig. 13 , There is a cylinder crankcase 1 can be seen, in which the supply of crankshaft bearings 2 and 3 camshaft bearings with lubricant is realized by cast into the bulkheads 23 curved guide channels 5d (corresponding to that in the Fig. 3 and 4 example described). In addition, here a cast-in as a pipe guide channel 5c is provided, which forms a pressure oil pipe 16 to a cylinder head. Unlike in the Fig. 11 shown example, this is not supplied directly from the main oil channel 4 with oil, but branches off from the cast-guide channel 5d. In addition, guide tubes 5g cast in as tubes are provided, which form fuel lines 24 (supply line and return lines) for the supply of a fuel pump (corresponding to the exemplary embodiment of FIG Fig. 12 ).

Numerous other combinations are to be realized advantageously and are encompassed by the invention, e.g. a cast-in bearing supply via separate connecting pipes 7 or a cast-in pipe system 9 i.V.m. a cast supply line 11 for the piston cooling; a cast-in supply line 11 for the piston cooling i.V.m. a cast-in fuel line 24; a cast-in pressure oil line 16 to the cylinder head i.V.m. a cast-in fuel line 24, etc.

The guide channels illustrated in the exemplary embodiments by way of example for the oil supply and the fuel supply 5 can be transferred accordingly to guide channels 5 for another medium.

The invention has been described herein for a cylinder crankcase 1, wherein the cylinder crankcase may be formed in one or more parts or it may also be a crankcase with attached cylinder housing.

LIST OF REFERENCE NUMBERS

1

cylinder crankcase

2

crankshaft bearings

3

camshaft bearings

4

Main oil

5

Guide channel (general)

5a

guide channel

5b

guide channel

5c

guide channel

5d

guide channel

5e

guide channel

5f

guide channel

5g

guide channel

6

Access

7

connecting pipe

7a

Section of 7

7b

Section of 7

8th

bend

9

pipe system

9a

Main duct

9b

In addition to the guide channel

10

core support

11

Oil supply for the piston cooling

12

cylinder

13

Gußhalterung

14

Oil pan pad

15

Front side of 1

16

Pressure oil line

17

obstacle

18

threaded hole

19

recess

20

Cylinder head pad

21

depression

22

recess

23

Scotland

24

Fuel line

25

curved line

26

outer wall

27

Recess for fuel pump

Claims (10)

1. A cast part for an internal combustion engine, the part being a cylinder crankcase (1), which has at least one guide duct (5, 5e), which is implemented in the form of a tube and is embedded inside the part when the latter is cast and which leads a fluid medium to a required location, the fluid medium being oil,
   characterized in that
   the at least one guide duct (5e) embedded as a tube forms a supply line (11) for piston cooling and
   the supply line (11) for piston cooling runs essentially exposed and is locally enclosed with cast material of the part, like a "shell", at multiple locations so that cast supports (13) are formed and the cast supports (13) are mounting points for spray nozzles, which can be subsequently mechanically introduced into the supply line (11) for piston cooling and which are each implemented and positioned in such a way that they spray lubricant directed into a cylinder chamber below a piston floor.
2. The cast part according to Claim 1,
   characterized in that
   the supply line (11) for piston cooling runs in a region of the crank chambers on the lower cylinder regions at a certain distance to the cylinder external walls.
3. The cast part according to one of the preceding Claims,
   characterized in that
   the supply line (11) for piston cooling is positioned in the longitudinal extension of the cylinder crankcase (1) and multiple cylinders (12) are supplied with oil from a shared supply line (11).
4. The cast part according to one of the preceding Claims,
   characterized in that
   the cast supports (13) are provided at the cylinder external walls.
5. The cast part according to one of the preceding Claims,
   characterized in that
   the cylinder crankcase (1) comprises at least one guide duct (5g) embedded as a tube, which forms a fuel line (24) for supplying a fuel pump.
6. The cast part according to Claim 5,
   characterized in that
   the fuel line (24) is positioned in the longitudinal extension of the cylinder crankcase (1).
7. The cast part according to Claim 5 or 6,
   characterized in that
   the fuel line (24) is a fuel supply line and multiple openings (27) for fuel pumps, into which fuel pumps can be inserted, are provided in the cylinder crankcase (1) over the length of the fuel supply line, the fuel supply line being cut and/or cut through in the regions of each of the openings (27) in the course of finishing measures on the cast cylinder crankcase (1) and the connections between guide duct (5g) and fuel pumps being thus produced.
8. The cast part according to one of the Claims 5 to 7,
   characterized in that
   a fuel line (24) embedded as a tube is a fuel return line.
9. The cast part according to one of the preceding Claims,
   characterized in that
   at least one embedded guide duct (5, 5e, 5g) is positioned in such a way that it runs partially or completely exposed in some regions.
10. The cast part according to one of the preceding Claims,
    characterized in that
    at least one embedded guide duct (5, 5e, 5g) has different cross-sectional shapes in its course.

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