DE102015109334A1 - exhaust manifold - Google Patents

Abstract

The invention relates to an exhaust gas inner tube 1 of an air gap-insulated exhaust manifold 2 consisting of at least two inner tubes 3, 4 formed by a respective tube wall 3.1, 4.1 and having an axis of symmetry S which is at least partially parallel to a direction X with respect to an xyz coordinate system , wherein each inner tube 3, 4 at least one pipe stub 3.2, 4.2 with an end face 3.3, 4.3 and a pipe stub 3.2, 4.2 arranged overlapping 3.4, 4.4, wherein the two adjacent inner tubes 3, 4 by means of the intersecting contour 3.4, 4.4 are inserted into each other , wherein a transverse to the symmetry axis S extending dividing plane T is provided and the section line L between the dividing plane T and the pipe wall 3.1, 4.1, the shape of the face 3.3, 4.3 of the pipe socket 3.2, 4.2 and / or the shape of the overlapping contour 3.4, 4.4. The dividing plane T is curved and the section line L between the tube wall 3.1, 4.1 and the dividing plane T is curved.

Description

The invention relates to an exhaust gas inner tube of an air gap-insulated exhaust manifold consisting of at least two inner tubes or inner parts formed by a respective tube wall and with an axis of symmetry S, which extends at least partially in a direction X with respect to an xyz coordinate system, wherein each inner tube at least one Pipe socket having an end face and arranged on the pipe socket overlap contour, wherein the two adjacent inner tubes are inserted into each other by means of the overlapping contour in the axial direction to the axis of symmetry S, wherein a transverse to the axis of symmetry S extending division plane T is provided and a section line L between the dividing plane T and the pipe wall, the shape of the end face of the pipe socket and / or the shape of the overlapping contour maps.

It is already an air gap insulated exhaust manifold from the DE 10 2009 035 727 A1 known. The inner tube consists of several inner tube parts nested one inside the other, wherein in each case adjacent inner tube parts have a planar or planar dividing plane which runs at right angles to the symmetry or main flow axis.

From the EP 1 329 607 A2 An air gap insulated exhaust manifold is also known. The inner tube likewise consists of a plurality of inner tube parts which are inserted one inside the other and have a dividing plane, wherein the dividing plane runs obliquely to the symmetry or main flow axis.

The object of the invention is to design and arrange an inner tube for an air gap-insulated exhaust manifold such that further manifold architectures on the one hand and better mounting conditions on the other hand are ensured.

The object is achieved according to the invention in that the dividing plane T is curved or the cutting line L between the tube wall and the dividing plane T is curved. This ensures that further manifold architectures can be formed, for example, the central arrangement of an outlet between two inlet ports. The dividing plane T is formed such that the tube wall is formed by at least adjacent tube parts in the region of the overlapping contour parallel to the axis of symmetry S. Consequently, with respect to the axis of symmetry S, opposite regions of the overlapping contour are parallel to one another. Thus, undercuts of the pipe socket in the overlapping contour are prevented. This ensures a simplified assembly and an optimal sliding seat connection. The direction x is at least in the region of the respective division plane or the overlapping contour parallel to the symmetry axis S.

• a) mindestens eine Krümmungsachse z1 aufweist, die zumindest teilweise in eine Richtung Z parallel zu einer z-Achse ausgerichtet ist;
• b) mindestens zwei Krümmungsachsen z1, z2 aufweist, die zumindest teilweise in eine Richtung Z parallel zur z-Achse ausgerichtet sind;
• c) vier Krümmungsachsen z1, z2, z3, z4 aufweist, die zumindest teilweise in eine Richtung Z parallel zur z-Achse ausgerichtet sind;
• d) mindestens eine Krümmungsachse y1 aufweist, die zumindest teilweise in eine Richtung Y parallel zu einer y-Achse ausgerichtet ist;
• e) mindestens zwei Krümmungsachsen z1, z2 aufweist, die zumindest teilweise in eine Richtung Z parallel zur z-Achse ausgerichtet sind, und dass mindestens zwei weitere Krümmungsachsen y1, y2 vorgesehen sind, die zumindest teilweise in eine Richtung Y parallel zur y-Achse ausgerichtet sind. Durch eine mehrfach gekrümmte Teilungsebene T kann gewährleistet werden, dass die Rohrwand von zumindest zwei ineinander zu steckenden Rohrteilen im Bereich der Überschneidungskontur parallel zur Symmetrieachse S ausgebildet ist.

It may also be advantageous for this purpose if the division plane T

• a) has at least one axis of curvature z1, which is at least partially aligned in a direction Z parallel to a z-axis;
• b) has at least two axes of curvature z1, z2, which are at least partially aligned in a direction Z parallel to the z-axis;
• c) has four axes of curvature z1, z2, z3, z4, which are at least partially aligned in a direction Z parallel to the z-axis;
• d) has at least one axis of curvature y1, which is at least partially aligned in a direction Y parallel to a y-axis;
• e) has at least two axes of curvature z1, z2, which are at least partially aligned in a direction Z parallel to the z-axis, and that at least two further axis of curvature y1, y2 are provided which are at least partially aligned in a direction Y parallel to the y-axis are. By a multiply curved division plane T can be ensured that the pipe wall is formed by at least two pipe parts to be plugged together in the region of the overlapping contour parallel to the axis of symmetry S.

Further, it may be advantageous if at least one overlapping contour has a shoulder which can be applied against the pipe socket or the front side of the adjacent inner pipe part, wherein the section line L between the dividing plane T and the pipe wall depicts the shape of the shoulder. The shoulder ensures a correspondingly long pipe socket an axial stop of the pipe socket during assembly. In principle, it is also possible to provide conical overlapping contours which ensure a sufficiently tight fit of the interposed inner tubes, at least in the warm state of the exhaust manifold.

The object is also achieved by an air gap-insulated exhaust manifold with an outer shell and an inner tube received in the outer shell as described above and by an exhaust system for an internal combustion engine or a motor vehicle with such an air gap-insulated exhaust manifold.

Further advantages and details of the invention are explained in the patent claims and in the description and illustrated in the figures. Show it:

1 an exhaust manifold according to the prior art;

2 an exhaust manifold with outer shell;

3a . 3b a schematic diagram of the formation of the section line L;

4a . 4b a schematic diagram of the formation of the 3D section line L;

5 a schematic diagram of the connector between two inner tubes.

An exhaust pipe 1 for air gap insulated exhaust manifold 2 consists of several inner tubes 3 . 4 , which are merely plugged together to ensure a sliding fit. Here have adjacent inner tubes 3 . 4 a division plane T on, which after 1 in the prior art, generally at right angles to an axis of symmetry S of the respective inner tube 3 . 4 or the exhaust manifold 2 is aligned. To 1 are the different dividing planes T for the different inner tubes 3 . 4 shown. The relative position of the dividing planes T is determined by an xyz coordinate system, the orientation of this coordinate system being directed to the respective division plane T, in the form that a direction X of the coordinate system is at the intersection with the dividing plane T parallel to the axis of symmetry S.

The inner tube 3 . 4 is with the adjacent inner tube 3 . 4 connected via a plug-in connection to a respective pipe socket 3.2 . 4.2 is provided. The engine side shows each inner tube 3 . 4 a flange plate 6 on, which serves to connect to a cylinder outlet.

The air gap insulated exhaust manifold 2 to 2 has an outer shell 5 as well as four inner tubes 3 . 3a . 4 . 4a on, by means of an overlapping contour 3.4 . 4.4 are plugged into each other. Each inner tube 3 . 3a . 4 . 4a has an inlet side, on which a flange plate 6 is provided. The inner tube 4 also has a connection flange 7 for connection to a continuing, not shown exhaust pipe. That after 2 left inner tube 3a also has a connection flange 8th for connecting an exhaust gas recirculation line.

In contrast to the prior art, the dividing plane T is between the two inner tubes 3 . 4 not flat or plan, but curved. The division plane T has two axes of curvature z1, z2, which are aligned parallel to a direction Z according to the xyz coordinate system. A section line L between the dividing plane T and the respective inner tube 3 . 4 or a pipe wall 3.1 . 4.1 determines the shape of a respective end face 3.3 . 4.3 or the respective overlapping contour 3.4 . 4.4 of the respective inner tube 3 . 4 , The section line L runs in such a way that the pipe wall 3.1 . 4.1 in the area of the overlapping contour 3.4 . 4.4 is aligned parallel to the axis of symmetry S, so that a proper installation of the sliding seat and a sufficient sealing effect are ensured.

After the 3a - 3b are different shapes for the section line L for a square inner tube 3 . 4 represented in the view in the xz-plane. To 3a has the section line L a double-curved shape according to 2 on. The two axes of curvature z1, z2 are each aligned transversely to the plane of the drawing in a direction Z of a z-axis. The section line L cuts the pipe wall 3.1 . 4.1 at an angle α of about 90 °.

According to embodiment 3b the cut line L has four curvature axes z1 to z4, so that a U-shaped profile of the cut line L is present with respect to the xz plane. The section line L bounded with the pipe wall 3.1 also an angle α of 90 °. The respective curvature axis z1 to z4 can arbitrarily have the coordinates y, x. The decisive criterion for the shape and position of the cutting line L is the alignment of the overlapping contour parallel to the axis of symmetry S; the latter over the entire circumference of the overlap contour.

According to embodiment 4a is the section line L with s-shaped profile as after 2 . 3a shown in the 3D illustration. While in the xy-plane the cut line L is curved in a s-shape, it runs flat on the xz-plane.

In contrast, the division plane T is after 4b curved three-dimensionally. In addition to the two axes of curvature z1, z2 of the section line L, which are largely aligned parallel to the direction Z, there are two further axes of curvature y1, y2, which are aligned in the basic direction parallel to a direction Y of the y-axis.

Thus, the dividing plane T can take any three-dimensional form. The proviso is that the overlap contour 3.4 . 4.4 in the region of the cutting line L runs over the entire circumference along the line L parallel to the axis of symmetry S.

To 5 is a sectional view of both inner tubes 3 . 4 shown. The inner tube 3 has an overlap contour 3.4 with a shoulder 3.5 on. The shoulder 3.5 has a height such that the inner tube 4 with its pointed end in the overlapping contour 3.4 in the direction of the axis of symmetry S is inserted. Both the shoulder 3.5 as well as the front side 4.3 of the inner tube 4 clamp a dividing plane T, which is shown simply formed simplified according to the present sectional view. The division level T can basically the in 4b shown, three-dimensional curved shape. As a rule, both are over the shoulder 3.5 as well as the over the front page 4.3 Spanned division plane T of both inner tubes 3 . 4 parallel. Deviations from this are possible in principle. Another division plane T (not shown here) is also on the front side 3.3 of the inner tube 3 clamped.

LIST OF REFERENCE NUMBERS

1

Exhaust inner tube

2

exhaust manifold

3

inner tube

3a

inner tube

3.1

pipe wall

3.2

pipe socket

3.3

front

3.4

overlapping contour

3.5

shoulder

4

inner tube

4a

inner tube

4.1

pipe wall

4.2

pipe socket

4.3

front

4.4

overlapping contour

5

outer shell

6

flange

7

flange

8th

flange

L

intersection

S

axis of symmetry

T

parting plane

x

Axis of the coordinate system

X

Direction from x

y

Axis of the coordinate system

Y

Direction of y

y1

axis of curvature

y2

axis of curvature

Z

Direction of z

z

Axis of the coordinate system

z1

axis of curvature

z2

axis of curvature

z3

axis of curvature

z4

axis of curvature

α

angle

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 102009035727 A1 [0002]
• EP 1329607 A2 [0003]

Claims (5)

Exhaust inner tube ( 1 ) an air gap insulated exhaust manifold ( 2 ) consisting of at least two by a respective pipe wall ( 3.1 . 4.1 ) formed inner tubes ( 3 . 4 ) and having an axis of symmetry S that is at least partially parallel to a direction X with respect to an xyz coordinate system, each inner tube ( 3 . 4 ) at least one pipe socket ( 3.2 . 4.2 ) with a front side ( 3.3 . 4.3 ) and one on the pipe socket ( 3.2 . 4.2 ) overlapping contour ( 3.4 . 4.4 ), wherein the two adjacent inner tubes ( 3 . 4 ) by means of the overlapping contour ( 3.4 . 4.4 ) are inserted into one another, wherein a transverse to the axis of symmetry S extending division plane T is provided and a section line L between the dividing plane T and the pipe wall ( 3.1 . 4.1 ) the shape of the front side ( 3.3 . 4.3 ) of the pipe socket ( 3.2 . 4.2 ) and / or the shape of the overlapping contour ( 3.4 . 4.4 ), characterized in that the dividing plane T is curved and the section line L between the tube wall ( 3.1 . 4.1 ) and the division plane T is curved. Inner tube ( 1 ) according to claim 1, characterized in that the dividing plane T a) has at least one axis of curvature z 1, which is aligned at least partially in a direction Z parallel to a z-axis; b) has at least two axes of curvature z1, z2, which are at least partially aligned in a direction Z parallel to the z-axis; c) has four axes of curvature z1, z2, z3, z4, which are at least partially aligned in a direction Z parallel to the z-axis; d) has at least one axis of curvature y1, which is at least partially aligned in a direction Y parallel to a y-axis; e) has at least two axes of curvature z1, z2, which are at least partially aligned in a direction Z parallel to the z-axis, and that at least two further axis of curvature y1, y2 are provided which are at least partially aligned in a direction Y parallel to the y-axis are. Inner tube ( 1 ) according to claim 1 or 2, characterized in that at least one overlapping contour ( 3.4 . 4.4 ) one shoulder ( 3.5 ), which against the pipe socket ( 3.2 . 4.2 ) or the front side ( 3.3 . 4.3 ) of the adjacent inner tube part ( 3 . 4 ) can be applied, wherein the section line L between the dividing plane T and the pipe wall ( 3.1 . 4.1 ) the shape of the shoulder ( 3.5 ) maps. Air gap insulated exhaust manifold ( 2 ) with an outer shell and an inner exhaust pipe ( 1 ) according to any one of the preceding claims. Exhaust system for an internal combustion engine or a motor vehicle with an air gap-insulated exhaust manifold ( 2 ) according to claim 4.

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