DE102018121424A1 - cylinder head - Google Patents

Abstract

The invention relates to a cylinder head (1). The cylinder head (1) comprises a cylinder head body (2) and a plurality of cylinder head inserts (3), wherein the cylinder head inserts (3) are disposed within the cylinder head body (2), and wherein the cylinder head inserts are manufactured by (3) a generative method, and wherein the Cylinder head body (2) is produced by means of a casting process.

Description

The invention relates to a cylinder head and a method for producing a cylinder head.

The DE102007017025A1 discloses a cylinder head for an internal combustion engine.

The cylinder head according to the invention comprises a cylinder head body and a plurality of cylinder head inserts, wherein the cylinder head inserts are disposed inside the cylinder head body, and wherein the cylinder head inserts are manufactured by a generative method, and wherein the cylinder head body is manufactured by a casting method.

The use of a generative method of manufacturing the cylinder head inserts allows flexible design of the cylinder head inserts. In this case, embodiments of the cylinder head inserts are made possible, which can not be achieved with other methods, such as milling or casting. These embodiments include, for example, cavities and / or chambers, which are connected, for example, via channels that have a complex course within all three spatial levels. This allows, for example, the production of efficient cooling structures.

A disadvantage of using a generative method can be an increased expenditure of time for the production. The use of a casting method for producing the cylinder head body allows at least partial compensation of this disadvantage. It allows a complex configuration of the cylinder head for the cylinder head inserts, while the cylinder head body can be cast with significantly reduced production time compared to the cylinder head inserts.

Thus, a reduction in the production time of the while enabling the possible complexity of the design of the cylinder head is made possible.

1. a) Herstellen der Zylinderkopfeinsätze mittels eines generativen Verfahrens;
2. b) Positionieren der Zylinderkopfeinsätze in eine Zylinderkopfkörpergussform;
3. c) Gießen des Zylinderkopfkörpers.

The inventive method for producing a cylinder head according to the invention comprises the steps:

1. a) producing the cylinder head inserts by means of a generative process;
2. b) positioning the cylinder head inserts in a cylinder head body mold;
3. c) casting the cylinder head body.

The cylinder head according to the invention is particularly suitable for applications in internal combustion engines, and in particular for internal combustion engines in the vehicle sector.

The inventive method allows the production of a cylinder head according to the invention. Thus, the advantages of the cylinder head according to the invention are also made possible by the inventive method. In addition, by step b) results in the advantageous possibility to position the cylinder head inserts within the cylinder head advantageous. In this way, for example, a region of the cylinder head, which adjoins a combustion chamber, may comprise a complexly designed cooling channel, so that an increase in the efficiency of cooling during operation of the internal combustion engine is made possible.

The dependent claims describe further advantageous embodiments of the invention.

• 1 einen erfindungsgemäßen Zylinderkopf mit Zylinderkopfeinsätzen, und
• 2 einen Querschnitt eines Zylinderkopfeinsatzes, und
• 3 einen Zylinderkopfeinsatz.

Preferred embodiments will be explained in more detail with reference to the following figures. It shows

• 1 a cylinder head according to the invention with cylinder head inserts, and
• 2 a cross section of a cylinder head insert, and
• 3 a cylinder head insert.

1 shows an embodiment of a cylinder head according to the invention 1 , This includes a cylinder head body 2 and several cylinder head inserts 3 , where the cylinder head inserts 3 inside the cylinder head body 2 are arranged, and wherein the cylinder head inserts 3 manufactured by a generative method, and wherein the cylinder head body 2 made by a casting process.

The cylinder head inserts 3 have a cylindrical base body. The dimensions of this body are 90 mm in diameter and 110 mm in height. The underside of the cylinder head inserts 3 is suitable for a combustion chamber 9 cover and / or close at the top.

2 shows a cross section of a cylinder head insert according to the invention 3 , In this embodiment, the cylinder head inserts 3 a cooling structure 4 and several functional structures 5 , wherein the cooling structure 4 adjacent to at least one functional structure 5 is arranged, and wherein the cooling structure 4 suitable for receiving a liquid cooling medium.

The cooling structure 4 is inside the cylinder head insert 3 trained, where there are no functional structures.

In addition, the cooling structure includes 4 a channel, the channel being three-dimensional within the cooling structure 4 is arranged.

In this embodiment, the liquid cooling medium becomes at an entry point into the cylinder head insert 3 initiated. The channel branches in the subsequent course to the entry point and pervades the cylinder head insert in individual channel strands 3 , In the further course of the channel, the individual channel strands unite and enter an exit point from the cylinder head insert 3 out. The course of the channel and / or the individual channel strands is screwed in sections, and contains sections of loops. The thickness of the channel wall is variable over the course and is between 0.8 mm and 20 mm.

As a result, a large proportion of the cylinder head insert in volume 3 from the cooling structure 4 ingested. This makes it possible to increase the cooling capacity, in particular also for the functional structures 5 , This allows a more efficient operation of the internal combustion engine.

In addition, the channel has a variable cross section over its course. In this embodiment, both the size of the diameter changes over the course, as well as the shape. In sections, the channel forms a circular and / or oval and / or versatile cross-section. This results in an organic structure, which is flowed through by the liquid cooling medium. This allows an increase in the volume flowed through by the cooling medium within the cylinder insert 3 , In addition, an increase in the flow rate of the cooling medium within the cylinder insert, and thus an increase in the cooling efficiency is made possible.

In addition, a first functional structure 5 designed to receive a valve guide.

In this embodiment are 4 first functional structures 5 in a cylinder head insert 3 educated. Thus, there are guides for four valves in each cylinder head insert 3 , so for each cylinder of the internal combustion engine. The channel comprises downstream of the entry point a bypass branch, at which one of the individual channel strands directly to the first functional structure 5 runs. Thus, a more efficient cooling of the first functional structure 5 , and thus the valve guide allows.

There is also a second functional structure 6 designed to receive an air duct.

In this embodiment, the second functional structure is 6 in the cylinder head inserts 3 duplicated. The air ducts are suitable for the combustion chamber 9 supply with supply air and with exhaust air. This is advantageous because the manufacturing of functional structures 5 . 6 How is done by air channels and / or recordings for valve guides in the same step, such as the production of the cylinder head inserts 3 , This makes it possible to omit additional work steps, which leads to a reduction of the production time and / or the production costs.

3 shows a cylinder head insert having an outside 8th and a holding structure 7 having. Here is the holding structure 7 on the outside 8th is convex.

In this embodiment, the support structures 7 available in different versions. On the one hand are holding structures 7 includes, which are hook-shaped. These allow a secure hold of the cylinder head inserts in the cylinder head body 2 after the casting of the cylinder head. In addition, holding structures are included, which are dish-shaped. These allow a more accurate positioning of the cylinder inserts within the cylinder head body. This is particularly advantageous when the plate-shaped holding structures are positioned on counterparts located in the cylinder head mold.

In addition, the cylinder head insert 3 at least partially made of an aluminum alloy.

In this embodiment, the cylinder head body 2 made of an aluminum alloy. This allows the production of the cylinder head inserts 3 from an aluminum alloy a good connection of the cylinder head body 2 to the cylinder head inserts 3 , The cylinder head inserts 3 are made of an aluminum-magnesium-scandium alloy, which is particularly suitable to be brought into shape by means of a generative process. The cylinder head inserts 3 are produced by means of a powder bed-based selective laser melting process, for which the aluminum-magnesium-scandium alloy is particularly well suited.

1. a) Herstellen der Zylinderkopfeinsätze (3) mittels eines generativen Verfahrens;
2. b) Positionieren der Zylinderkopfeinsätze (3) in eine Zylinderkopfkörpergussform;
3. c) Gießen des Zylinderkopfkörpers (1).

An unillustrated inventive method for producing a cylinder head according to the invention 1 includes the steps:

1. a) Manufacture of the cylinder head inserts ( 3 ) by means of a generative process;
2. b) Positioning the Cylinder Head Inserts ( 3 ) in a cylinder head body casting mold;
3. c) casting the cylinder head body ( 1 ).

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 102007017025 A1 [0002]

Claims (9)

A cylinder head (1) comprising a cylinder head body (2) and a plurality of cylinder head inserts (3), wherein the cylinder head inserts (3) are disposed inside the cylinder head body (2), and wherein the cylinder head inserts (3) are made by a generative process, and wherein the Cylinder head body (2) is produced by means of a casting process. Cylinder head after Claim 1 wherein the cylinder head inserts (3) comprise a cooling structure (4) and a plurality of functional structures (5, 6), wherein the cooling structure (4) is arranged adjacent to at least one functional structure (5, 6), and wherein the cooling structure (4) is for receiving a liquid cooling medium is suitable. Cylinder head (1) to Claim 2 wherein the cooling structure (4) comprises a channel, and wherein the channel is arranged three-dimensionally within the cooling structure (4). Cylinder head (1) to Claim 3 wherein the channel has a variable cross-section over its course. Cylinder head (1) after one of Claims 2 to 4 wherein a first functional structure (5) is adapted to receive a valve guide. Cylinder head (1) after one of Claims 2 to 5 wherein a second functional structure (6) is adapted to receive an air duct. Cylinder head (1) according to one of the preceding claims, wherein a first cylinder head insert (3) comprises an outer side (8), and wherein the outer side (8) has a holding structure (7), and wherein the holding structure (7) on the outer side (8 ) is convex. Cylinder head (1) according to one of the preceding claims, wherein a cylinder head insert (3) is made at least partially of an aluminum alloy. Method for producing a cylinder head (1) according to one of the preceding claims, comprising the steps: a) producing the cylinder head inserts (3) by means of a generative process; b) positioning the cylinder head inserts (3) in a Zylinderkopfkörpergussform; c) casting the cylinder head body (1).

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