Exhaust manifold flange for an internal combustion engine

Details Exhaust manifold flange for an internal combustion engine Exhaust manifold flange for an internal combustion engine

1998-02-27

2001-07-03

Nicholson, Eric K. (Department: 3629)

Pipe joints or couplings

Having plural independent paths

Parallel paths

C060S323000, C285S416000, C285S124300, C285S288100, C029S890090

Reexamination Certificate

active

06254142

ABSTRACT:

The invention relates to an exhaust manifold flange for an internal combustion engine of the type defined in more detail in the preamble of claim
1
.
The prior art discloses exhaust manifolds which are realized as cast parts and have a cast-on flange.
However, these known exhaust manifold flanges which are attached to the cylinder head of the internal combustion engine have the disadvantage that they are heavy in weight and are relatively expensive to manufacture. The heavy weight of the known exhaust manifold flanges results in the further disadvantage that they draw too much heat from the exhaust gas in the starting phase of the internal combustion engine, with the result that the downstream catalytic converter is able to convert the exhaust gas only after a delay.
A further disadvantage of the known exhaust manifold flanges is that the high weight and the center of gravity of the exhaust manifold flange which is at a large distance from the internal combustion engine leads to undesired vibrations of the internal combustion engine. This is problematic in particular in the case of internal combustion engines fabricated from aluminum or aluminum alloys.
The object of the invention is therefore to provide an exhaust manifold flange which is low in weight and can thus contribute to reducing the consumption of the internal combustion engine. In addition, the exhaust manifold flange is intended to make a contribution to being able to fulfill the more stringent conditions of the new exhaust gas legislation, to have lower production costs and, furthermore, to have sufficient flexural strength despite its low weight.
This object is achieved according to the invention by means of the features specified in the characterizing part of claim
1
.
The inventive basic part made of sheet metal results in a considerably reduced weight of the entire exhaust manifold flange since the sheet metal can be of very thin design. In order, nevertheless, to achieve a high degree of rigidity, the basic part is provided according to the invention with a bead on its outer contour and/or circumferentially. As a result of the beads with which the at least one receiving hole is also provided, a further increase in the rigidity, in particular in the flexural strength, of the exhaust manifold flange according to the invention is advantageously obtained.
Moreover, it is advantageous that the stub pipes which can be inserted securely into the receiving holes result in a sealed connection in order to extract to exhaust gas from an internal combustion engine.
Further advantageous refinement possibilities of the invention emerge from the sub claims and from the following exemplary embodiment described in principle with reference to the drawing, in which:
FIG. 1
shows a plan view of an embodiment of the exhaust manifold according to the invention;
FIG. 2
shows a section along the line II—II in
FIG. 1
;
FIG. 3
shows a section along the line III—III in
FIG. 1
;
FIG. 4
shows an enlarged view along the line IV in
FIG. 3
;
FIG. 5
shows a section along the line V—V in
FIG. 1
;
FIG. 6
shows plan view of a further embodiment of the exhaust manifold according to the invention;
FIG. 7
shows a section along the line VII—VII in
FIG. 6
; and
FIG. 8
shows an enlarged view along the line VIII in FIG.
7
;


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