DE102010055160A1 - Producing cylinder crankcase comprising integrally molded in cylinder liners and cooling water space, comprises providing cylinder liners, introducing cylinder liners and cylinder liners, casting and removing material of cylinder crankcase - Google Patents

Abstract

Producing a cylinder crankcase (10) comprising at least two integrally molded in cylinder liners (11) and at least one cooling water space (14) associated with the cylinder liners, comprises: (a) providing at least two cylinder liners; (b) introducing at least one groove-shaped recess (17); (c) introducing the cylinder liners into a casting mold for the cylinder crankcase; (d) casting of the crankcase; and (e) removing the material of the cylinder crankcase in the region of the groove-shaped recesses, which at least one connecting channel (18) is formed to at least one cooling water space. Producing a cylinder crankcase (10) comprising at least two integrally molded in cylinder liners (11) and at least one cooling water space (14) associated with the cylinder liners, comprises: (a) providing at least two cylinder liners; (b) introducing at least one groove-shaped recess (17) in each cylinder liner; (c) introducing the cylinder liners into a casting mold for the cylinder crankcase, which the groove-shaped recesses are arranged at the same height of two adjacent cylinder liners facing one another; (d) casting of the crankcase by casting the cylinder liners and freely holding the at least one cooling water space; and (e) removing the material of the cylinder crankcase in the region of the groove-shaped recesses, which at least one connecting channel (18) is formed to at least one cooling water space. Independent claims are also included for: (1) producing the cylinder crankcase comprising a cylinder liner composite formed from at least two cylinder liners and at least one cooling water space associated with the cylinder liner composite comprises providing the cylinder liner composite from at least two cylinder liners, introducing at least one hole between two adjacent cylinder liners, introducing the cylinder liner composite into a casting mold for the cylinder crankcase, casting of the crankcase by casting the cylinder liner composite and freely holding the at least one cooling water space, and removing the material of the cylinder crankcase from the at least one hole between the two adjacent cylinder liners, which at least one connecting channel is formed to at least one cooling water space; (2) the cylinder crankcase comprising at least two cylinder liners and cooling water space associated with at least one of the cylinder liners, where the at least two cylinder liners each exhibit at least one groove-shaped recess, which the groove-shaped recess of adjacent cylinder liners are arranged facing each other at the same height and at least one connecting channel is formed to at least one cooling water space in the region of the groove-shaped recesses; and (3) the cylinder crankcase comprising the cylinder liner composite formed from at least two cylinder liners and at least one cooling water space associated with the cylinder liner composite, where at least one continuous opening is formed between two adjacent cylinder liners of the cylinder liner composite forming the connecting channel to at least one cooling water space through at least one hole.

Description

The present invention relates to a method for producing a cylinder crankcase having at least two cylinder liners and at least one cooling water chamber associated with the cylinder liners. The present invention further relates to such a cylinder crankcase.

In the case of such cylinder liners arranged in the engine block of a motor vehicle, in particular the region of the cylinder liners facing the combustion chamber or the cylinder head gasket must be adequately cooled. From the DE 10 2007 041 010 A1 It is known to introduce for this purpose in the cylinder crankcase cooling holes in the form of two intersecting blind holes, which extend at the level of the area to be cooled cylinder liners and are connected to the at least one cooling water space, so that cooling water flow through the cooling holes and the area to be cooled Cylinder liners can wash around. The introduction of this in the DE 10 2007 041 010 A1 However, blind bores described is very expensive. Furthermore, for the introduction of these and other, simpler structured cooling holes usually both the material of the cylinder crankcase and the material of the cylinder liners must be processed, since the cylinder liners are arranged at a small distance from each other. If, as is often the case, different materials are used for the cylinder crankcase and the cylinder liners, this leads to increased tool wear and the generation of shavings, which then have to be painstakingly separated again for the purpose of disposal.

The present invention has for its object to provide a method for producing a generic cylinder crankcase, in which the cooling holes are introduced in manufacturing technology particularly favorable manner. In addition, a possibly increased tool wear and possibly the generation of shavings should be avoided.

A first solution according to the invention consists of the following method steps: (a) providing at least two cylinder liners, (b) introducing at least one groove-shaped recess in each cylinder liner, (c) introducing the cylinder liners into a casting mold for a cylinder crankcase, such that the groove-shaped recesses of two (D) casting the cylinder crankcase with pouring the cylinder liners and keep the at least one cooling water space, (e) removing the material of the cylinder crankcase in the region of the nub-shaped recesses, such that at least one connecting channel to the at least a cooling water space is formed.

The cylinder crankcase according to the invention according to this first solution is characterized in that at least two cylinder liners each have a groove-shaped recess that the nufförmigen recesses of adjacent cylinder liners are arranged facing each other in the same amount, and that in the region of the nub-shaped recesses at least one connecting channel to the at least one Cooling water space is formed.

A second solution according to the invention comprises the following method steps: (a) providing a cylinder liner assembly comprising at least two cylinder liners, (b) introducing at least one bore between two adjacent cylinder liners, (c) inserting the cylinder liner assembly into a casting block for a cylinder crankcase, (d) casting the liner Cylinder crankcase under pouring the Zylinderlaufbuchsenverbunds and keeping the at least one cooling water chamber, (e) removing the material of the cylinder crankcase from the at least one bore between two adjacent cylinder liners, such that at least one connecting channel is formed to the at least one cooling water space.

The cylinder crankcase according to the invention according to this second solution is characterized in that the cylinder liner composite has at least one bore, so that in the region of the nub-shaped recesses at least one connecting channel. is formed to the at least one cooling water space.

The two solutions according to the invention are characterized in that the or the cooling channels are introduced in principle in advance in the form of nub-shaped recesses or in the form of at least one bore in the lateral surfaces of the cylinder liners or in the cylinder liner composite. To produce the at least one, acting as a cooling hole, connecting channel to the at least one cooling water space in both cases now only the material that is used to encase the cylinder liners or the cylinder liner composite, in the region of the groove-shaped recesses or the at least one bore removed become.

In this way, a very accurate positioning of acting in the finished cylinder crankcase as cooling holes connecting channels in the area to be cooled cylinder liners possible. The production of the connecting channels is Production technology particularly simple, since the introduction of the groove-shaped recesses on the cylinder liners or the at least one bore is carried out in advance and thus the tool most suitable for this purpose can be used. Correspondingly, in the cylinder crankcase, only the material which was used for encapsulating the cylinder liners or the cylinder liner composite must be machined so that the most suitable tool can also be used for this purpose. In this way, the life of the tools is significantly extended and premature wear is avoided.

The Nufförmigen recesses may have any cross-section. Analogously, the holes may have any diameter. The dimensions of the nub-shaped recesses or the at least one bore are selected in each case depending on the desired cooling capacity.

Advantageous developments emerge from the subclaims.

A particularly preferred embodiment provides that in step (b) the at least one groove-shaped recess is formed as a secant-shaped recess. Preferably, two mutually opposite groove-shaped recesses are introduced into at least one cylinder liner. Thus, a connecting channel between two centrally located cylinder liners can be formed particularly easily after a single such recess is sufficient for a terminal cylinder liner. Instead, the at least one groove-shaped recess in at least one cylinder liner may be formed as a circumferential groove-shaped recess to subsequently form between arbitrary (centrally or terminally arranged) cylinder liners the connection channel.

The cylinder liners can either be individually inserted into the mold for the cylinder crankcase. In this case, the nub-shaped recesses are filled during casting with the material of the cylinder crankcase. However, they can also be introduced in a manner known per se as a cylinder liner block in the casting mold for the cylinder crankcase. In this case, the individual cylinder liners are introduced into a mold for a cylinder liner block such that the nub-shaped recesses of two adjacent cylinder liners are arranged facing each other at the same height. During Umzuießens the Nufförmigen recesses are filled with the material of the cylinder liner block. The resulting cylinder liner block is then inserted into the mold for the cylinder crankcase, wherein the orientation of the, provided in the cylinder liners, nubular recesses is fixed to each other in the cylinder liner block. The material for casting the cylinder liner block is suitably the same as that used to make the cylinder crankcase.

If the material for the cylinder liners or the cylinder liner composite is different from the material for the cylinder crankcase, can for introducing the Nufförmigen recesses or holes before pouring one hand and for the removal of the material in the region of these recesses or holes after casting the cylinder crankcase On the other hand, each suitable for this material tool can be used. Thus, the tools are exposed to less wear. Furthermore, no mixed chips, so that the disposal of waste material significantly simpler and more economical to perform.

In particular, if a steel material or a cast iron material is used for casting the cylinder crankcase, a light metal material, for example. An aluminum alloy, and / or for the production of cylinder liners or the cylinder liner composite, the inventive method has proven very useful. In this case, the material properties are so different that introducing prior art cooling holes after casting the cylinder crankcase is very difficult because both the light metal material and the steel or cast iron material must be machined with the same tool.

A further preferred embodiment provides that the cylinder liners or the cylinder liner composite are at least partially provided with a structured surface. Thus, the connection between the cylinder liner or cylinder liner composite on the one hand and cylinder crankcase on the other hand is supplemented by a form-fitting component and optimized in a particularly simple manner.

The manner of structuring the surface and its manufacturing method can be chosen arbitrarily. For example, the structuring of the surface may be formed as an irregular structure. It may also be in the form of random or regular grooves, grooves, ribs, waves, burls, mushrooms, thorns or a combination thereof. The structured surface can be produced, for example during the production of the cylinder liner or of the cylinder liner composite, by casting, sintering, forming. The structured Surface can also be produced by machining methods and / or blast treatment (preferably shot peening or laser beams). But it can also be formed as, for example, molybdenum-containing thermal spray coating or as, for example, silicon-containing galvanic outer coating.

Embodiments of the invention will be described in more detail below with reference to the accompanying drawings. Shown schematically, not to scale:

1 a first embodiment of a cylinder crankcase according to the invention with cast-cylinder liners in a perspective view partially in section;

2 an illustration of the manufacturing method according to the invention for the cylinder crankcase according to 1 ;

3a a cylinder liner for a further embodiment of a cylinder crankcase according to the invention in a side view;

3b the cylinder liner according to 3a in a 90 ° rotated side view.

3c a cylinder liner for a further embodiment of a cylinder crankcase according to the invention in a side view;

4a a cylinder liner composite for a further embodiment of a cylinder crankcase according to the invention in a side view;

4b the cylinder liner composite according to 4a in a top view.

1 shows a first embodiment of a cylinder crankcase 10 for an internal combustion engine. The cylinder crankcase 10 has cast-in cylinder liners 11 on. The number of cylinder liners 11 depends on the design of the internal combustion engine; three cylinder liners 11 are shown as examples. The cylinder liners 11 consist in the embodiment of a steel material or a cast iron material. The cylinder crankcase 10 consists in the embodiment of a light metal alloy based on aluminum, for example. An aluminum-silicon alloy and is preferably produced by die-casting. In known manner, the cylinder crankcase 10 with oil return channels 12 and screw holes 13 be provided for the attachment of the cylinder head and / or the crankshaft bearing (not shown).

For cooling the cylinder liners 11 during operation is in the cylinder crankcase 10 a the cylinder liners 11 Cooling water space surrounding over an axial partial area 14 intended. This cooling water room 14 is directly in the cylinder crankcase 10 cast in, for example by means of salt cores or sand cores, and surrounds the subareas of the cylinder liners 11 , Between the cooling water room 14 and the cylinder liners 11 is a perimeter wall 15 intended. The perimeter wall 15 is in the embodiment in one piece with the cylinder crankcase 10 trained and serves the improved grip of the cylinder liners 11 in the cylinder crankcase 10 , The cooling water room 14 is sealed at the top by means of a cylinder head gasket (not shown).

To the connection between the cylinder liners 11 and the cylinder crankcase 10 to optimize, are the cylinder liners 11 in the exemplary embodiment completely in a conventional manner with a structured surface 16 provided with an irregular structure. Structures may also be formed in the form of random or regular grooves, grooves, ribs, waves, burls, mushrooms, thorns or a combination thereof. The structured surface 16 can, for example, during the production of the cylinder liners 11 be made by casting, sintering, forming. The structured surface 16 may also be produced by machining methods and / or blast treatment (preferably shot peening or laser beams). However, it can also be embodied as a thermal spray coating, which may contain molybdenum, for example, or galvanic outer coating, which may contain, for example, silicon.

The cylinder liners 11 are with groove-shaped recesses 17 provided, which are formed in the embodiment as circumferential groove-shaped recesses. The groove-shaped recesses 17 two adjacent cylinder liners 11 are arranged at the same height facing each other. Out 1 it can be seen that the groove-shaped recesses 17 are arranged in the embodiment substantially in the horizontal. The groove-shaped recesses 17 but can also be arranged at an angle to the horizontal.

Out 1 It can be seen that the groove-shaped recesses after the casting of the cylinder crankcase with the material of the cylinder crankcase 10 are filled. In the area where the nubby recesses 17 two adjacent cylinder liners 11 are arranged at the same height facing each other, is a connection channel 18 provided with the cooling water space 14 connected is. Thus, cooling water in the connection channel 18 enter and for cooling the cylinder liners 11 contribute to this area.

The cylinder liners 11 are in the embodiment directly into the cylinder crankcase 10 cast. Instead, in a conventional manner, a cylinder liner block (not shown) are produced by the cylinder liners with a suitable material, preferably a light metal alloy, particularly preferably encapsulated with an aluminum alloy and in this form in the mold for the cylinder crankcase 10 be introduced. It is particularly expedient to use the same material or at least the same material type (for example, one aluminum alloy in each case) for the production of the cylinder liner block as for the production of the cylinder crankcase 10 ,

2 shows schematically the individual process steps of the manufacturing method according to the invention using the example of the cylinder crankcase 10 according to 1 , The cylinder liners 11 be made in a conventional manner, for example. From a steel material or a cast iron material, in particular cast. When casting or subsequently they are in a conventional manner with a textured surface 16 Mistake. Furthermore, the cylinder liners 11 in the region which faces the cylinder head gasket in the finished internal combustion engine, with a groove-shaped recess 17 , Provided in the exemplary embodiment with a circumferential groove-shaped recess. The groove-shaped recess 17 in the embodiment has a dome-shaped cross-section their number and dimensions are selected depending on the desired cooling capacity.

The cylinder liners produced or processed in this way 11 with the groove-shaped recess 17 (see in 2 the cylinder liner 11a with groove-shaped recess 17a far left) are in the embodiment with a distance 21 directly into the casting mold for the cylinder crankcase 10 brought in. 2 shows by the cylinder liner 11a far left and the right immediately adjacent cylinder liner 11b in that the cylinder liners 11 be introduced into the mold so that the groove-shaped recesses 17 two adjacent cylinder liners 11 be arranged at the same height facing each other. Accordingly, in 2 the groove-shaped recess 17a the cylinder liner 11a and the groove-shaped recess 17b the cylinder liner 11b a passage 19 , Subsequently, the cylinder crankcase 10 poured, with the distance 21 and the passage 19 with the material of the cylinder crankcase 10 be filled. This is in 2 between the cylinder liners 11b and 11c shown. Subsequently, as it is in 2 between the cylinder liners 11c and 11d is shown, exclusively the material of the cylinder crankcase 10 in the area of the passage 19 removed, in particular by machining. This creates the in 1 illustrated connection channel 18 who lives in the 1 illustrated cooling water space 14 empties.

The 3a and 3b show a further embodiment of a cylinder liner 111 for an inventive cylinder crankcase 10 , The cylinder liner 111 is different from the one in the 1 and 2 illustrated cylinder liner 11 only in that they have a groove-shaped recess 117 has, which is not formed as a circumferential, but as a secant-shaped recess. Out 3 it can be seen that the groove-shaped recesses 117 are arranged in the embodiment substantially in the horizontal. The groove-shaped recesses 117 but may also be arranged at an angle to the horizontal or from two at an angle to the horizontal and mutually existing recesses 217 exist, as in 3c shown.

The cylinder liner 111 has in the embodiment, two opposing secant-shaped recesses 117 on. For a cylinder liner disposed in the finished internal combustion engine terminal 111 extends a single secant-shaped recess 117 from, which is facing a corresponding, circumferential or secant-shaped recess of the adjacently arranged cylinder liner at the same height.

The 4a and 4b show an embodiment of a cylinder liner composite 222 , The number of cylinder liners 211 in the cylinder liner composite 222 depends on the design of the internal combustion engine; three cylinder liners 211 , are shown as examples. The cylinder liner composite 222 consists in the embodiment of a steel material or a cast iron material and is produced in a conventional manner, for example. Cast. When casting or subsequently, as described above, the surface of the cylinder liner composite 222 be provided with a textured surface (not shown). Furthermore, the cylinder liner composite 222 in the area that faces the cylinder head gasket in the finished internal combustion engine, with at least one bore 223 , in the exemplary embodiment with two holes provided. Here are the holes 223 in the dock area 224 between two adjacent cylinder liners 211 brought in. The number, arrangement and diameter of the holes 223 are selected depending on the desired cooling capacity. In the exemplary embodiment, the holes 223 arranged substantially in the horizontal. The holes 223 but may also be arranged at an angle to the horizontal or consist of two holes, which are each arranged at an angle to the horizontal and we intersect approximately in the middle of the web consist.

Subsequently, as described above, the cylinder crankcase 10 poured, with the holes 223 with the material of the cylinder crankcase 10 be filled. Subsequently, only the material of the cylinder crankcase 10 in the field of drilling 223 removed, in particular by machining. This creates a connection channel 18 into the cooling water room 14 of the cylinder crankcase 10 empties. Thus, cooling water can enter the connection channel and for cooling the cylinder liners 211 contribute to this area.

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 102007041010 A1 [0002, 0002]

Claims (15)

Method for producing a cylinder crankcase ( 10 ) with at least two cast-in cylinder liners ( 11 . 111 ) and at least one of the cylinder liners ( 11 . 111 ) associated cooling water space ( 14 ), characterized by the following method steps: (a) providing at least two cylinder liners ( 11 . 111 ), (b) introducing at least one groove-shaped recess ( 17 . 117 ) in each cylinder liner ( 11 . 111 ), (c) inserting the cylinder liners ( 11 . 111 ) in a casting mold for a cylinder crankcase ( 10 ), such that the groove-shaped recesses ( 17 . 117 ) of two adjacent cylinder liners ( 11 . 111 ) are arranged facing each other at the same height, (d) casting the cylinder crankcase ( 10 ) while pouring in the cylinder liners ( 11 . 111 ) and keep at least one cooling water space ( 14 ), (e) removing the material of the cylinder crankcase ( 10 ) in the region of the groove-shaped recesses ( 17 . 117 ), such that at least one connecting channel ( 18 ) to the at least one cooling water space ( 14 ) is formed. Method for producing a cylinder crankcase ( 10 ) with one of at least two cylinder liners ( 211 ) formed cylinder liner composite ( 222 ) and at least one cylinder liner composite ( 222 ) associated cooling water space ( 14 ), characterized by the following method steps: (a) providing a cylinder liner composite ( 222 ) from at least two cylinder liners ( 211 ), (b) introducing at least one bore ( 223 ) between two adjacent cylinder liners ( 211 ), (c) inserting the cylinder liner composite ( 223 ) in a casting mold for a cylinder crankcase ( 10 ), (d) casting the cylinder crankcase ( 10 ) pouring the cylinder liner composite ( 223 ) and keep at least one cooling water space ( 14 ), (e) removing the material of the cylinder crankcase ( 10 ) from the at least one bore ( 223 ) between two adjacent cylinder liners ( 211 ), such that at least one connecting channel to the at least one cooling water space ( 14 ) is formed. A method according to claim 1, characterized in that in step (b) the at least one groove-shaped recess ( 117 ) is formed as a secant-shaped recess. A method according to claim 1, characterized in that in step (b) the at least one groove-shaped recess ( 17 ) in at least one cylinder liner ( 11 ) is formed as a circumferential groove-shaped recess. A method according to claim 1, characterized in that in step (b) the at least one groove-shaped recess ( 17 ) in at least one cylinder liner ( 11 ) is formed as two from each other at an angle intersecting recesses. A method according to claim 1 or 2, characterized in that for casting the cylinder crankcase ( 10 ) a light metal material, in particular an aluminum alloy, is used. Method according to claim 1 or 2, characterized in that cylinder liners ( 11 . 111 ) or a cylinder liner composite ( 222 ) are used from a steel material or a cast iron material. Method according to claim 1 or 2, characterized in that the cylinder liners ( 11 . 111 ) or the cylinder liner composite ( 222 ) at least partially with a structured surface ( 16 ). Cylinder crankcase ( 10 ) with at least two cylinder liners ( 11 . 111 ) and at least one of the cylinder liners ( 11 . 111 ) associated cooling water space ( 14 ), characterized in that the at least two cylinder liners ( 11 . 111 ) at least one groove-shaped recess ( 17 . 117 ), that the nub-shaped recesses ( 17 . 117 ) of adjacent cylinder liners ( 11 . 111 ) are arranged at the same height facing each other, and that in the region of the groove-shaped recesses ( 17 . 117 ) at least one connection channel ( 18 ) to the at least one cooling water space ( 14 ) is formed. Cylinder crankcase ( 10 ) with one of at least two cylinder liners ( 211 ) formed cylinder liner composite ( 222 ) and at least one cylinder liner composite ( 222 ) associated cooling water space ( 14 ), characterized in that between two adjacent cylinder liners ( 211 ) of the cylinder liner composite ( 222 ) at least one through opening ( 223 ) is formed, through the at least one bore a connecting channel ( 18 ) to the at least one cooling water space ( 14 ). Cylinder crankcase according to claim 8, characterized in that in at least one cylinder liner ( 111 ) the at least one groove-shaped recess ( 117 ) is formed as a secant-shaped recess. Cylinder crankcase according to claim 8, characterized in that in at least one cylinder liner ( 11 ) the at least one groove-shaped recess ( 17 ) is formed as a circumferential groove-shaped recess. Cylinder crankcase according to claim 8 or 9, characterized in that the cylinder crankcase ( 10 ) is cast from a light metal material, in particular an aluminum alloy. Cylinder crankcase according to claim 8 or 9, characterized in that the cylinder liners ( 11 . 111 ) or the cylinder liner composite ( 222 ) consist of a steel material or a cast iron material. Cylinder crankcase according to claim 8 or 9, characterized in that the cylinder liners ( 11 . 111 ) or the cylinder liner composite ( 222 ) at least partially a structured surface ( 16 ) exhibit.

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