DE102018003234A1 - Exhaust duct arrangement for an internal combustion engine - Google Patents

Abstract

The invention relates to an exhaust gas passage arrangement (10) for an internal combustion engine (60) having at least two exhaust ducts (20, 40) having respective duct ends (22, 42) to which respective inlet openings (24, 44) for introducing exhaust gas into respective ones Channel interiors of the respective exhaust ducts (20, 40) are arranged, and which respective, at least partially interconnected at a portion of the common channel region (12) of the exhaust duct assembly (10) interconnected and the respective channel interiors each partially surrounding channel walls (26, 46). The exhaust duct arrangement (10) comprises at least one cooling rib (50) which extends at least at a region portion (14) of the connecting region (12), which is connected to the respective channel walls (26, 46) and which the respective channel interior spaces of the at least two cooling channels (20, 40) fluidly separated from each other.

Description

The invention relates to an exhaust gas channel arrangement for an internal combustion engine, having at least two exhaust ducts, which have respective channel ends, at which respective inlet openings for introducing exhaust gas into respective channel interiors of the respective exhaust ducts are arranged, and which respective, at least partially interconnected at a common connection region of the exhaust duct assembly and the respective channel interior spaces each have partially surrounding channel walls.

To comply with future exhaust emission limits and fuel consumption limits, it may be appropriate to allow higher exhaust gas temperatures after combustion in respective combustion chambers of internal combustion engines. In order that corresponding, acted upon with hot exhaust gas components, which include not only a cylinder head and other exhaust gas guide components, such as exhaust gas turbocharger and catalysts are not damaged, it may be useful, the exhaust gas on the way from the respective combustion chambers in the cylinder head to the catalyst or exhaust gas turbocharger to actively cool down. For active exhaust gas cooling in this path region known exhaust gas channels are cooled in the cylinder head by several, cylinder head water jackets from different sides, so for example from above and below. A maximum amount of heat that can be dissipated depends on the respective surfaces that are directly exposed to exhaust gas in the corresponding channels (outlet channels) as well as on surfaces that are wetted with cooling water in the water jackets around the respective outlet channels. The known arrangement of the water jackets above and below the outlet channels limits the maximum amount of heat dissipatable and thus the maximum possible cooling capacity.

From the DE 101 41 533 A1 is a multi-cylinder internal combustion engine whose cylinder head defines internal exhaust ducts, which come from a plurality of partially defined by the cylinder head combustion chambers, known. The exhaust ducts converge in a confluence area, which is also defined inside the cylinder head. The cylinder head is provided with a water jacket which extends above and below the exhaust ducts and over each combustion chamber. Further, upper and lower water jackets are provided which communicate with each other through a communication passage formed in a vertical wall.

The DE 10 2012 215 317 A1 describes an engine cooling system that includes a cylinder head having an integrated exhaust manifold that directs exhaust gases to an exhaust gas exit passage and a coolant passage that surrounds the exhaust manifold. Further, the engine cooling system includes a group of separate exhaust passages for directing exhaust gases to the exhaust gas exit passage, the group including a wellbore disposed in material between the exhaust passages, the wellbore fluidly connected to the coolant passage.

Object of the present invention is to provide an exhaust duct assembly of the type mentioned, by which a particularly effective exhaust gas cooling can be achieved.

This object is achieved by an exhaust duct assembly with the features of claim 1. Advantageous embodiments with expedient developments of the invention are specified in the other claims.

The invention relates to an exhaust gas channel arrangement for an internal combustion engine, having at least two exhaust ducts, which have respective channel ends, at which respective inlet openings for introducing exhaust gas into respective channel interiors of the respective exhaust ducts are arranged, and which respective, at least partially with each other at a common connection region of the exhaust duct arrangement connected and the respective channel interiors each having partially surrounding channel walls, from.

In order to achieve a particularly effective exhaust gas cooling, it is provided according to the invention that the exhaust gas channel arrangement comprises at least one cooling fin which extends at least at a region portion of the connection region, which is connected to the respective channel walls and which fluidly separates the respective channel interior spaces of the at least two cooling channels , This is advantageous because a heat-dissipating and thus cooling channel surface is increased by the at least one cooling fin for each of the at least two exhaust ducts, so that effective heat removal (cooling) of exhaust gas guided in the respective duct interior spaces can also be effected at the common combustion region remote from the combustion chamber , Thus, on the whole, improved cooling of the exhaust gas based on the exhaust gas channel arrangement in a cylinder head of the internal combustion engine and additionally or alternatively outside the cylinder head for protecting subsequent components, which may include, for example, catalytic converters or exhaust gas turbochargers, can be effected. As a result, higher combustion end temperatures in respective combustion chambers of the Internal combustion engine or the cylinder head are allowed, without thereby having to accept a thermal overload of the said, subsequent components in purchasing. The higher combustion end temperatures may in turn have a positive effect on the combustion of the internal combustion engine, and / or allow the use of less expensive materials.

In an advantageous development of the invention, the at least one cooling rib is formed as one piece with the respective channel walls associated casting. This is advantageous, since in this way a particularly undisturbed heat conduction between the duct walls and the at least one cooling fin can take place, whereby particularly large quantities of heat can be dissipated to the environment.

In a further advantageous development of the invention, the at least one cooling rib has at least one casting channel formed for the flow of coolant, in particular cooling water. This is advantageous since, as a result of the production, the casting channel has a particularly rough surface, as a result of which an improved turbulence-related heat transfer and thus an improved cooling effect can be achieved when flowing through the casting channel with coolant, such as cooling water.

In a further advantageous development of the invention, the at least one cooling rib has a cooling bore formed for the flow of coolant, in particular cooling water. This is advantageous because a particularly targeted, partially cooling can be done by the at least one cooling hole. Thus, for example, by targeted adjustment of a bore diameter of the cooling bore, a flow velocity of the coolant bore flowing through the coolant can be specified and, accordingly, a desired cooling effect can be set particularly accurately.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

• 1 eine Perspektivansicht einer aus dem Stand der Technik bekannten Abgaskanalvorrichtung ;
• 2 eine Seitenansicht der Abgaskanalvorrichtung;
• 3 eine Draufsicht auf die Abgaskanalvorrichtung;
• 4 eine Perspektivansicht einer Abgaskanalanordnung;
• 5 eine Draufsicht auf die Abgaskanalanordnung;
• 6 eine Detailansicht eines Teilbereichs der Abgaskanalanordnung; wobei eine Kühlrippe gezeigt ist;
• 7 eine weitere Detailansicht der Abgaskanalanordnung, wobei die Kühlrippe mit einem Gusskanal versehen ist; und
• 8 eine weitere Detailansicht der Abgaskanalanordnung, wobei die Kühlrippe mit einer Mehrzahl von Kühlbohrungen versehen ist.

Showing:

• 1 a perspective view of a known from the prior art exhaust duct device;
• 2 a side view of the exhaust duct device;
• 3 a plan view of the exhaust duct device;
• 4 a perspective view of an exhaust duct assembly;
• 5 a plan view of the exhaust duct assembly;
• 6 a detailed view of a portion of the exhaust duct assembly; wherein a cooling fin is shown;
• 7 a further detail of the exhaust duct assembly, wherein the cooling fin is provided with a casting channel; and
• 8th a further detail of the exhaust duct assembly, wherein the cooling fin is provided with a plurality of cooling holes.

In the figures, the same or functionally identical elements are provided with the same reference numerals.

1 . 2 and 3 each show different views of a known from the prior art exhaust duct device 70 an internal combustion engine, of which present only respective combustion chambers 82 are shown. Of each of the present three shown combustion chambers 28 each lead two exhaust pipes 72 . 74 the exhaust duct device 70 Exhaust gas to respective, combustion chamber distant exhaust guide components 84 to which may include an exhaust gas turbocharger and a catalytic converter. To the respective exhaust pipes 72 . 74 to cool, includes the exhaust passage device 70 respective water coats 76 . 78 between which the exhaust pipes 72 . 74 are arranged. The water coats 76 . 78 can via respective connection openings 80 be fluidly interconnected, as in 3 is indicated.

4 and 5 each show different representations of an exhaust duct arrangement 10 , The exhaust duct arrangement 10 includes a plurality of exhaust ducts 20 . 40 About which hot exhaust from here not shown combustion chambers of a 4 and 5 only schematically shown internal combustion engine 60 can be performed. The exhaust ducts 20 . 40 have respective channel ends 22 . 42 on, at which respective inlet openings 24 . 44 for introducing the exhaust gas coming from the respective combustion chambers into respective channel interior spaces of the respective exhaust gas channels 20 . 40 are arranged. The exhaust ducts 20 . 40 are at a common connection area 12 the exhaust duct assembly 10 at least in certain areas interconnected and have, the respective channel interior at least partially surrounding channel walls 26 . 46 on. The effluent from the respective combustion exhaust gas can be passed through the channel interior and accordingly passes through the respective exhaust ducts 20 . 40 to a common outlet opening 16 the exhaust duct assembly 10 , From the outlet 16 From the exhaust gas can be fed to an exhaust gas turbocharger and additionally or alternatively to an exhaust gas catalyst, wherein the exhaust gas turbocharger or the exhaust gas catalyst in 4 and 5 not shown.

In order to achieve a particularly effective exhaust gas cooling of the exhaust gas, the exhaust duct arrangement 10 at least one cooling fin 50 include, which at least at a portion of the area 14 of the connection area 12 extends. The cooling fin 50 is on opposite sides of the cooling rib with the respective channel walls 26 . 46 connected, wherein the respective channel interior spaces of the cooling channels 20 . 40 fluidly by means of the cooling fin 50 are separated from each other.

6 shows that the cooling fin 50 as one piece with the respective channel walls 26 . 46 connected casting can be formed. The cooling fin 50 can thus flow in the exhaust duct assembly 10 inserted, or integrated, with the cooling fin 50 for example, may be cast in aluminum. 6 shows the cooling fin 50 without active flow with coolant, ie without active cooling water flow.

The cooling fin 50 In addition, a, for flow with coolant, such as cooling water, formed casting channel 52 have, as in 7 is shown. The casting channel 52 can accordingly allow a cast water cooling.

Additionally or alternatively, the cooling fin 50 one or more for the flow of coolant (for example cooling water) formed cooling holes 54 as exemplified in 8th is shown. The cooling holes 54 For example, they may be made by a machining process. In other words, the cooling holes 54 by mechanical processing of the cooling fin 50 be prepared.

LIST OF REFERENCE NUMBERS

10

Exhaust duct assembly

12

connecting area

14

area section

16

outlet opening

20

first exhaust duct

22

channel end

24

inlet opening

26

channel wall

40

second exhaust duct

42

channel end

44

inlet opening

46

channel wall

50

cooling fin

52

sprue

54

cooling hole

60

Internal combustion engine

70

Exhaust duct device

72

exhaust pipe

74

exhaust pipe

76

water jacket

78

water jacket

80

connecting opening

82

combustion chamber

84

Exhaust system component

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 10141533 A1 [0003]
• DE 102012215317 A1 [0004]

Claims (4)

An exhaust passage assembly (10) for an internal combustion engine (60) having at least two exhaust passages (20, 40) having respective channel ends (22, 42) at which respective inlet openings (24, 44) for introducing exhaust gas into respective passageways of the respective exhaust passages (20, 40) are arranged, and which respective, on a common connection region (12) of the exhaust duct assembly (10) at least partially interconnected and the respective channel interiors each partially surrounding channel walls (26, 46), characterized in that the exhaust duct arrangement ( 10) comprises at least one cooling rib (50) which extends at least at a region section (14) of the connection region (12) which is connected to the respective channel walls (26, 46) and which surrounds the respective channel interior spaces of the at least two cooling channels (20, 20; 40) fluidly separated from each other. Exhaust duct arrangement (10) according to Claim 1 characterized in that the at least one cooling rib (50) is formed as a one-piece with the respective channel walls (26, 46) connected casting. Exhaust duct arrangement (10) according to Claim 2 , characterized in that the at least one cooling rib (50) at least one, for the flow of coolant, in particular cooling water, formed casting channel (52). Exhaust duct arrangement (10) according to one of the preceding claims, characterized in that the at least one cooling rib (50) has a, for the flow of coolant, in particular cooling water, formed cooling bore (54).

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