DE102004056601B4 - Arrangement for sealing two assemblies for different media - Google Patents

Abstract

Sealed arrangement of two subassemblies for different media, an interior of a first subassembly being acted upon by a first medium, with a pipeline being passed through the interior of the first subassembly, which is filled with another medium and which is supported in a wall of the first subassembly is, for water-cooled internal combustion engines, in which a coolant is guided in a flow path between a water jacket in a cylinder head (1) and a radiator within a coolant line designed as a pipe socket (2), which is fastened in a sealed manner in the cylinder head (1) and is exposed to oil Chain case cover (4) is supported, the pipe socket (2) in the passage area to the chain case cover (4) being arranged to run in such a geometric contour that between the longitudinal axis (X) of the pipe socket (2) and the mounting surface (5) on the chain case cover (4) results in an angle deviating from the orthogonal and wherein the pipe socket (2) in this passage area has a sealing element that is operatively connected to the chain case cover (4).

Description

The invention relates to an arrangement for sealing two assemblies for different media, wherein the interior of the first assembly is acted upon with a first medium, wherein through the interior of the first assembly, a pipe is guided, which is filled with a different medium and in the Wall of the first assembly is supported, in particular for sealing water-cooled internal combustion engines, in which the coolant is guided in the flow path between the water jacket in the cylinder head and the radiator within a configured as a pipe stub coolant line, which is sealed in the cylinder head and is supported in a Ölbeaufschlagten chain box cover ,

For many technical applications, assemblies that are exposed to a fluid or gaseous medium must be sealed in order to both ensure the functionality of the respective assembly as well as to avoid environmental problems, for example by escaping lubricants. A typical field of application in this regard are internal combustion engines, in which, in addition to a gas seal (for example, between the crankcase and cylinder head) on numerous assemblies in the liquid region (for example, engine oil and coolant), a seal is necessary to prevent leakage of the respective medium.

In DE 203 14 842 U1 An arrangement for connection between a corrugated pipe and a cylindrical connecting part will be described. The end sections of corrugated pipe and connecting part are pushed into each other and fixed axially with a locking ring and a retaining clip. In addition, two O-rings are arranged for fluid sealing between the associated contours of corrugated tube and connector. With this technical solution, which is designed for piping to solar collectors, a connection between two media-carrying assemblies is realized. In this case, a minor leakage is irrelevant, if in both modules the same medium is performed. Problems due to a mixture of different media are therefore excluded. Furthermore, such a minor leakage also does not give environmentally relevant concerns because water is used predominantly as a medium.

However, an application of this technical solution or similar seals is problematic if different media are performed in the mutually sealed assemblies. This is relevant for constructions which have a housing, the interior of which is acted upon by a first medium and through which interior a pipeline is led, which is filled with another medium. Such an arrangement is formed for example on internal combustion engines, in which the coolant is guided in the flow path between the water jacket in the cylinder head and the radiator within a separate coolant line through a Ölbeaufschlagten chain box cover. For such applications, even a slight leakage and thus occurring mixing of the present media coolant and oil can not be accepted. Rather, at the passage of the coolant line through the chain box cover mandatory a leak-free seal is necessary.

Such a seal can according to US Pat. No. 6,453,868 B1 can be achieved by the flow channels are structurally integrated directly into a relevant cover contour, wherein the lid and the associated channels are designed as a common casting. This variant is suitable for gear cover and similar molded assemblies, while a use for chain box lid is questionable both for manufacturing and cost reasons.

In a reciprocating internal combustion engine according to EP 0 705 964 B1 are the frontally arranged modules and drive belts covered with a running from the crankcase lower part to the cylinder head chain box cover. The chain box cover ensures a protected arrangement of drive belts and other frontally arranged modules and at the same time allows an encapsulated lubrication of these modules. In this case, at least one designed as a separate pipe stub coolant line is provided, which is secured sealed with a front end portion in the cylinder block or in the cylinder head. Starting from the cylinder block or cylinder head of this pipe socket initially passes through the free space within the contour of the chain box cover and is finally performed orthogonal to the mounting surface of the chain box cover through the wall to the outside.

In DE 197 54 009 A1 another water-cooled internal combustion engine is described, which also has a chain box lid, through which a pipe socket integrated into the coolant circuit runs. Also in this construction, the pipe socket is fixed with the one portion in the cylinder block or in the cylinder head and out with the other portion orthogonal to the mounting surface of the chain box cover through the wall to the outside.

Such an orthogonal arrangement of pipe socket and mounting surface of the chain box lid requires a very precise production and Assembly of these modules. Even with minor deviations, for example in lateral offset of the chain box lid due to the screwing on the cylinder head, the tightness in the transition region of the two modules is not guaranteed, so that mixing of the two different media coolant and oil can occur, both functional and environmentally relevant Aspects is disadvantageous.

The DE 43 36 952 A1 shows an engine radiator for a reciprocating internal combustion engine, in which an arrangement is known, which is suitable for sealing two different assemblies with different media.

Out DE 44 30 427 C1 is a liquid-cooled internal combustion engine with liquid-cooled generator is known in which a compression tube are held by sealing elements in a wall, wherein the cooling water pipe is surrounded by another medium.

The object of the invention is to provide an arrangement which allows for two filled with different media and each other modules to be supported even with at least small deviations from the orthogonal effective sealing.

This object is achieved by the pipe socket is arranged to extend in the passage area to the chain box cover in such a geometric contour that results in a deviating from the orthogonal angle between the longitudinal axis of the pipe socket and the mounting surface on the chain box cover and wherein the pipe socket in this passage area with the Chain box lid is associated with operatively connected sealing element. The sealing element is preferably designed as a circumferential seal on the pipe socket and has a contour which allows compensation of radial dimensional differences.

The arrangement according to the invention is suitable for numerous technical applications, in which a mutual sealing of assemblies is necessary, in which different media are performed. A preferred application here are internal combustion engines, this arrangement can be used for example for the installation of a pipe socket with coolant in the chain box cover.

With this arrangement, both impaired functional reliability and the environment by leaking or mixing of different media are avoided. An essential advantage is an assembly without functional defects even if the relative position of the two modules to be joined deviates from the orthogonal. This is achieved with only a small component cost, wherein the sealing element advantageously compensates for a lateral offset of the chain box cover due to the screwing on the cylinder head.

An embodiment of the invention is illustrated in the drawing and will be described below. Show it:

1 the basic structure of an arrangement according to the invention in a perspective view

2 a section from 1 in an enlarged view

3 a section from 2 in an enlarged view

The arrangement according to the invention is suitable for sealing two assemblies for different media. A preferred and shown in the drawing application here is the sealing of water-cooled internal combustion engines, in which the coolant - whose flow direction is stylized in the drawing with compact arrows - in the flow path between the water jacket in the cylinder head 1 and the cooler not shown within a pipe socket 2 configured coolant line is guided in the cylinder head 1 is sealed and attached an oil-loaded space 3 permeates that of a chain box lid 4 is covered. Such a structure is known per se, so that it is possible to dispense with further statements in this regard at this point.

Essential in the present situation, however, is the structural design in the area of the passage of the pipe socket 2 through the chain box lid 4 , Here, the pipe socket runs 2 in such a geometric contour that extends between the longitudinal axis "X" of the pipe socket 2 and the mounting surface 5 at the chain box lid 4 An angle results from an orthogonal between the pipe socket 2 and the associated mounting surface 5 differs.

At the same time the pipe socket 2 in this passage area, a sealing element 6 associated with the chain box lid 4 is in active connection. The sealing element 6 is preferably as a, on the pipe socket 2 configured circumferential seal and has a contour that allows compensation of radial dimensional differences. A relevant contour for the sealing element 6 is in particular out 3 seen. Thus, an assembly offset of the chain box cover 4 on the cylinder head 1 be compensated. Such an offset can be achieved by the screw connection 7 arise if the result of manufacturing tolerances no congruent mounting surface 8th between cylinder head 1 and chain box lid 4 can be realized.

LIST OF REFERENCE NUMBERS

1

cylinder head

2

pipe socket

3

Space between cylinder head and chain box lid

4

Timing case cover

5

Mounting surface of chain box cover / pipe socket

6

sealing element

7

Screw connection chain box cover / cylinder head

8th

Mounting surface of chain box cover / cylinder head

X

Longitudinal axis of the pipe socket

Claims (3)

Sealed arrangement of two assemblies for different media, wherein an interior of a first assembly is acted upon by a first medium, wherein through the interior of the first assembly, a pipe is guided, which is filled with a different medium and which supported in a wall of the first assembly is, for water-cooled internal combustion engines, in which a coolant in a flow path between a water jacket in a cylinder head ( 1 ) and a cooler within a pipe socket ( 2 ) configured coolant line is in the cylinder head ( 1 ) is sealed and in an oil-loaded chain box lid ( 4 ) is supported, wherein the pipe socket ( 2 ) in the passageway to the chain box lid ( 4 ) is arranged running in such a geometric contour that between the longitudinal axis (X) of the pipe socket ( 2 ) and the mounting surface ( 5 ) on the chain box lid ( 4 ) gives an angle deviating from the orthogonal and wherein the pipe socket ( 2 ) in this passage area with the chain box lid ( 4 ) in operative connection sealing element ( 6 ) assigned. Arrangement according to claim 1, characterized in that the sealing element ( 6 ) as one on the pipe socket ( 2 ) circumferential seal is configured. Arrangement according to claim 1, characterized in that the sealing element ( 6 ) has a contour to compensate for radial dimensional differences.

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