DE4118403C2 - casing - Google Patents

Description

The invention relates to a housing, in particular a crankcase, made by casting, with at least two of them separate cavities in which casting cores are arranged during casting are.

Cast crankcases usually have cavities that are produced by casting cores during the casting process. The cast cores own core brands with which the cast cores in the molding sand of the Mold box are stored and fixed.

If there are cavities next to each other with corresponding ne cast cores arranged next to one another there is a risk that the casting cores when closing the mold and during the casting process move yourself against each other. This allows the wall thickness between between the cavities are different, causing the casting piece can become unusable. This problem is with the gat tion-forming EP-B 0 280 675 given. With the subject of this There is a core connection bar in the document, but it does only connects parts of a water jacket core. The core of oil-wetted spaces in this mold has extensions, however, these are not connected to the core connection bar.

The invention has for its object the casting offset and thus to avoid scrap in the foundry as far as possible and To prevent leakage between the individual cavities.  

This object is achieved in that the cavities are water spaces and oil-wetted spaces that the cast cores a first approach for the water spaces and the casting cores for the oil-wetted rooms have a second approach, the Approaches are connected by a core connection bar and that the core connection bar is arranged on the side next to the housing is and serves as the outer core for this. This training and attendance order prevents the casting offset between the casting cores of the different cavities because the cast cores of each cavity rooms firmly connected with each other via the core connection bar are. The core connection bar also functions as the outside core of the housing.

This advantage is particularly pronounced in the case of a one-piece design Casting cores for the water rooms and the oil-wetted rooms with the Core connection bar.

In the case of complicatedly designed cores, it may be cheaper if the Casting cores for the water rooms and the oil-wetted rooms and the Core connection bar made separately and then over the first and second approaches are combined.

A single core also offers the advantage of a simple assembly ge of the mold, since fewer individual parts are inserted into it have to. In addition, the storage of a large core in the Gußka Most precise than the storage of several small cores, because the core connecting bar of the large cast core an appropriate size right base.

The cylindrical design of the An intended in further training sets of cast cores enables easy machining of the circle shaped openings for the core hole closures.  

In an advantageous development of the invention, the casting cores for the water rooms and the oil-wetted rooms as well as the Core connection bar on a common division level to which all cast cores are undercut-free. This allows one fold production of the cores and avoids because of missing back cut any lot parts.

In further training, the division level runs through the axes of the An sentences. Thus the position of the division plane of the cores is due to the cylindrical shape of the approaches of the cores set.

Further features of the invention result from the following Be writing and the drawing, in which an embodiment of the Invention is shown schematically.

Show it:

Fig. 1 shows a horizontal section through a crankcase,

Fig. 2: a partial cross section through the crankcase

The crankcase 6 has integrated liners 7 which are surrounded by a cavity in which the casting core 1 is located during the casting process and cooling water is in the engine mode. In the cavities, which are formed by the cast cores 2 , there is lubricating oil.

The cast cores 1 and 2 are connected to the core connecting bar 5 to form a unit via the separately led out lugs 3 and 4 . In this way, a shift of the casting cores 1 and 2 against each other is avoided. In addition, the generi ge storage of the cast cores 1 and 2 by means of the Kernverbindungsbal kens 5 a displacement of these cores relative to the outer shape of the crankcase 6 difficult, whereby all walls of the crankcase 6 get the intended wall thickness and rejects leakage between the individual rooms or is avoided to the outside.

The division level 8 is chosen so that the casting cores 1 , 2 , 5 are without an undercut and are therefore particularly easy to manufacture. Thus, the arrangement according to the invention causes inexpensive manufacture of cast housings.

Claims (6)

1. Housing, in particular crankcase, which is made by casting forth, with at least two separate Hohlräu men, in which casting cores are arranged during casting, characterized in that the cavities are what serräume and oil-wetted spaces that the casting cores for the water spaces ( 1 ) have a first attachment ( 3 ) and the cast cores for the oil-wetted spaces ( 2 ) have a second attachment ( 4 ), the attachments ( 3 , 4 ) being connected by a core connection bar ( 5 ) and in that the core connection bar ( 5 ) is arranged to the side of the housing and serves as an outer core for this. 2. Housing according to claim 1, characterized in that the cast cores for the water spaces ( 1 ) and the oil-wetted spaces ( 2 ) with the core connecting bar ( 5 ) are integrally formed. 3. Housing according to claim 1, characterized in that the cast cores for the water spaces ( 1 ) and the oil-wetted spaces ( 2 ) and the core connecting bar ( 5 ) are separately produced and then connected to one another via the first and second approaches ( 3 , 4 ) . 4. Housing according to one of the preceding claims, characterized in that the approaches ( 3 , 4 ) are preferably formed cylin drisch. 5. Housing according to one of the preceding claims, characterized in that the casting cores for the water spaces ( 1 ) and the oil-wetted spaces ( 2 ) and the core connecting bar ( 5 ) have a common division level ( 6 ), with respect to which all the casting cores ( 1 , 2 , 6 ) are free of undercuts. 6. Housing according to claim 5, characterized in that the division plane ( 6 ) through the axes sen of the approaches ( 3 , 4 ).