DE19735061B4 - Flange for a multi-flow exhaust system of motor vehicles - Google Patents

Abstract

multipart Flange (1) for a mehrflutige exhaust system of motor vehicles, where the several stacked flange boards existing flange (1) on the engine head, covering the exhaust gas outlets is attached to the flange (1) an exhaust manifold and to this further exhaust pipes are connected, the flange (1) for each exhaust outlet an exhaust gas passage opening (2) has, the flange (1) sealed in a first at the engine head attached flange plate (3), which with the exhaust gas outlet of the engine in each case in line open connection exhaust gas passage openings (2), passage openings (6), which also with the respective exhaust outlet in open-circuit Connection, the first flange board (3) on the exhaust gas outlet of the engine side facing away from a second flange (4) covered which also has exhaust gas passage openings (2) leading to the exhaust gas passage openings (2) the first flange board (3) are each aligned coaxially, and which has a channel (7) into which the passage openings (6) of the first flange plate (3) open, wherein the tubes of the exhaust manifold directly to the...

Description

The The invention relates to a flange for a multi-flow exhaust system of motor vehicles according to the preamble of claim 1.

From the DE 43 15 086 A1 is a generic, multi-piece flange for elbows on internal combustion engines for guiding the exhaust gas between the engine block and the exhaust pipe is known, wherein the flange has a contact surface for abutment with the engine block. In this document, a first flange is designed as a flat board with exhaust gas passages and welded or soldered to another flange. The further flange part is designed as a stamped sheet metal part with fastening and exhaust openings and an integrated air injection duct.

In the DE 37 17 989 A1 a mounting flange for mounting of pipes is described, wherein the flange is constructed of a plurality of punched sheet metal blanks. However, there are no board openings or flange channels for supplying secondary air.

The DE 42 14 796 A1 discloses an exhaust manifold for internal combustion engines, wherein in a motor flange of the exhaust manifold a closed end steel tube for supplying and distributing secondary air is poured.

According to the DE 34 34 288 A1 is an exhaust manifold with a flange for its attachment to an engine block and leading away from the flange pipes, said flange is lamellar of a plurality of interconnected, in particular soldered boards constructed. In the exhaust gas passage openings of the boards, the tubes of the exhaust manifold are welded.

Of these, Based on the invention, the object is based on a flange generic type to provide that easily creates a way to secondary air the drain valves to run the corresponding engine, wherein the feed of the secondary air preferably at a single location.

These Task is by a multi-part flange with the features of claim 1.

The first part the flange can be formed by a one-piece board, the corresponding exhaust gas passage openings and passage openings for the Respectively of secondary air having. Alternatively, the first part also from single, ring-like Be formed flat segments, each having an exhaust passage and a Having passage for the secondary air supply. On the first section, that is now in one piece formed or formed of several individual segments, is a second section applied, which also has exhaust gas passage openings, the axis appropriate to the exhaust gas passage openings aligned the first section and which either has a channel which serves as a transit slot through the second section may be formed, in which open the passage openings of the first section, or openings having, with the passage openings for the secondary air of the first part in an open connection. A third section is the second section overlapping arranged, this third section either, if the second section is provided with a channel having a passage opening for secondary air, in the Channel opens, or but which, if the second section only openings for the secondary air has, is formed as a molding, which forms a channel, the with the supply air connection to Respectively the secondary air connected is. The third part can, if it covers the second part in total, also the exhaust gas passage openings have, in turn, congruent with the exhaust gas passage openings formed of the first and second part are, or else the third section can only be in the area be arranged, which is free of exhaust gas passage openings of the first and second partial piece is, so that's it virtually next to these openings is arranged.

By the training of the invention Is it possible, to make the flange in a simple manner and layers, wherein through the appropriate formation of through holes or slit-like channels in the individual sections that central feeding of secondary air to the third section allows is and the introduction the supplied secondary air at the engine head in the areas preferably the exhaust valves allows is.

Preferably is provided that the sections by flat sheet metal blanks with perforations to form the passages or of the channel are formed.

Under circumstances can also be provided that the second section is provided in a double arrangement on each other to the volume of the channel to enlarge.

moreover can be provided that in the congruently formed exhaust gas passage openings of the sections each a sleeve inserted, in particular soldered is that flush closes with the top and bottom of the flange and in the plugged the corresponding pipe end of the exhaust manifold and with this welded is.

Furthermore, it can be provided that the Supply air connection to the third portion is formed by a cohesively fixed nozzle or a cohesively secured pipe molding.

embodiments The invention are shown in the drawing and described in more detail below.

It shows:

1 a flange formed according to the invention in plan view;

2 the flange in section II II of 1 seen;

2a a variant in the same view as 2 seen;

3 a section along section line III III of 1 seen;

3a a variant of the same view as 3 seen;

4 to 6 the individual sections of a three-layer flange in an individual view.

In the drawing is a flange 1 shown for a multi-flow exhaust system of motor vehicles, the flange 1 on the engine head, the exhaust gas outlets is mounted overlapping and connected to the flange, an exhaust manifold with corresponding exhaust pipes. In this case, the flange 1 an exhaust gas passage opening for each exhaust gas outlet 2 on.

The flange 1 consists of three flange boards 3 . 4 . 5 , where the section 4 can also be provided in a double arrangement. In the first flange plate to be fastened to the engine head 3 , Which in each case in line open connection with the exhaust gas outlet of the engine Abgasdurchlaßöffnungen 2 has, are additional passage openings 6 are provided, which are in line open communication with the respective exhaust outlet of the engine and serve for supplying secondary air to the respective exhaust valves. In the embodiment, the passage openings 6 coaxial with the exhaust gas passage openings 2 arranged and formed, but separated from them. The between the engine head and the first flange board 3 to be arranged seal is designed so that the passage openings 6 and the exhaust gas passage opening 2 is recessed, so that these areas are not sealed against each other, but are included only on the outer peripheral side of the corresponding seal. Thus, the through the passage opening 6 blown secondary air into the exhaust port of the engine head.

The one-piece in the embodiment of the first flange 3 is on the side facing away from the exhaust port of the engine side of a second flange 4 covered, which also exhaust passage openings 2 which leads to the exhaust gas passage openings 2 the first flange board 3 are aligned coaxially. In addition, the second flange plate has 4 a slit-like channel 7 on, in the passage openings 6 the first flange board 3 open out. Furthermore, a third flange is 5 provided which overlaps the second flange board 4 is arranged and at least one passage opening 8th (alternatively 8th' ), which in the channel 7 opens and to which a supply air connection for supplying secondary air to the exhaust gas outlet, in particular connected to the exhaust valves of the engine head or can be connected. The third flange board 6 also has exhaust gas passage openings in the exemplary embodiment 2 on that with the exhaust gas passage openings 2 the flange boards 3 and 4 are arranged congruently. The flange boards 3 . 4 . 5 are by flat sheet metal blanks with perforations to form the passages 6 . 8th or the channel 7 formed, just as naturally with holes to form the exhaust gas passages 2 , The boards are stacked and soldered together, for example, in the areas 9 Lotdepots are provided for Lotmittel. Furthermore, the flange boards have perforations 10 for the penetration of fastening screws or threaded bolts.

As in particular from 3a can be seen in the congruent aligned exhaust port openings 2 each pods 11 used and soldered, which serve to ensure that the manifold pipes of the manifold can be easily welded. In addition, also in a Durchgangslochung 10 a sleeve 12 be soldered, which serves to seal, so that the perforation 10 against the slot channel leading past this area 7 is sealed.

The supply air connection 13 can, as in 2 shown by a material fit on the third flange board 5 be formed fixed nozzle or the like or it may be formed by a tubular molding, as from 2a which can be seen on the third flange board 5 welded or soldered.

As if from a juxtaposition of 3 and 3a it can be seen, the second flange can 4 also be layered from two identical elements, so that in total 4 Flange boards arise as if from 3a is apparent. Through this four-layer formation, the volume of the channel 7 enlarged, without the need to use particularly thick boards.

In the execution according to 3 For example, the boards may have a thickness of 4 mm each, while in the embodiment of FIG 3a the outer boards have a thickness of 4 mm and the double inner board can have a thickness of 3 mm.

The layer thicknesses are to be varied as required, in particular depending on the required volume of the channel 7 ,

The inventive training allows a simple feeder of secondary air from a central location of the flange to the individual exhaust outlets of the Motors, with the feeder the secondary air can be done at a suitable location of the flange and to the individual Departure areas of the engine head can be guided.

The Invention is not on the embodiment limited but in the context of the Revelation often variable.

All new individual items disclosed in the description and / or drawing. and combination features are considered essential to the invention.

Claims (4)

Multi-part flange ( 1 ) for a multi-flow exhaust system of motor vehicles, wherein the flange consisting of several stacked flange ( 1 ) on the engine head, the exhaust gas outlets is mounted overlapping, to the flange ( 1 ) are connected to an exhaust manifold and to this further exhaust pipes, the flange ( 1 ) for each exhaust outlet an exhaust gas passage opening ( 2 ), the flange ( 1 ) in a first on the engine head sealed flange plate ( 3 ), which communicate with the exhaust gas outlet of the engine respectively in line open connection Abgasdurchlaßöffnungen ( 2 ), passage openings ( 6 ), which are also in line-open connection with the respective exhaust gas outlet, the first flange plate ( 3 ) on the exhaust gas outlet of the engine side remote from a second flange ( 4 ) is covered, which also exhaust passage openings ( 2 ) leading to the exhaust gas passage openings ( 2 ) of the first flange board ( 3 ) are each coaxially aligned, and which a channel ( 7 ) into which the passage openings ( 6 ) of the first flange board ( 3 ), wherein the tubes of the exhaust manifold directly to the exhaust gas passage openings ( 2 ) of the first flange board ( 3 ), further comprising a supply air connection ( 13 ) Or is connected for supplying secondary air to the exhaust gas outlet can be connected, characterized in that a third Flanschplatine ( 5 ) the second flange board ( 4 ) is arranged at least partially overlapping, which at least one passage opening ( 8th ), which are in the channel ( 7 ) and to which the supply air connection ( 13 ) is connected or connectable for supplying secondary air to the exhaust gas outlet, wherein the third flange plate ( 5 ) either the exhaust gas passage openings ( 2 ) of the first or second flange board ( 3 . 4 ) for direct connection of the pipes of the exhaust manifold leaves or this with coaxial openings ( 2 ) are covered to which the pipes of the exhaust manifold are connected or connectable or which are penetrated by the tubes, and that the flange boards ( 3 . 4 . 5 ) by flat sheet metal plates with perforations to form the passages ( 6 . 8th ) and the channel ( 7 ) are formed. Flange according to claim 1, characterized in that the second flange plate ( 4 ) is arranged in a double arrangement on each other to increase the volume of the channel ( 7 ) to enlarge. Flange according to claim 1 or 2, characterized in that in the congruent formed exhaust gas passage openings ( 2 ) of the flange boards ( 3 . 4 . 5 ) one sleeve each ( 12 ), which is flush with the top and bottom of the flange ( 1 ) and into which the corresponding pipe end of the exhaust manifold is inserted and welded to it. Flange according to Claims 1 to 3, characterized in that the supply air connection ( 13 ) on the third flange board ( 5 ) Is formed by a cohesively fixed nozzle or a cohesively secured pipe molding.