Exhaust gas duct system for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-9822684-B2
Application number	US-201615050935-A
Country	US
Kind code	B2
Filing date	Feb 23, 2016
Priority date	Feb 24, 2015
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

An exhaust gas duct system for an internal combustion engine includes an upstream, first exhaust gas pipe area ( 30 ), a downstream, second exhaust gas pipe area ( 34 ) adjoining the first exhaust gas pipe area ( 30 ) in a transition area ( 38 ) in an exhaust gas flow direction (G), and a liquid drain channel area ( 60 ) in the transition area. The drain channel area is open from the exhaust gas flow volume ( 78 ) in the first exhaust gas pipe area ( 30 ) or/and in the second exhaust gas pipe area ( 34 ) to a liquid collection volume ( 80 ).

First claim

What is claimed is:

1. An exhaust gas duct system for an internal combustion engine, the exhaust gas duct system comprising:
an upstream, first exhaust gas pipe area;
a downstream, second exhaust gas pipe area adjoining the first exhaust gas pipe area in a transition area in an exhaust gas flow direction; and
a liquid drain channel area in the transition area, which channel area is open from an exhaust gas flow volume in the first exhaust gas pipe area or is open from an exhaust gas flow volume in the second exhaust gas pipe area or is open from both the exhaust gas flow volume in the first exhaust gas pipe area and the exhaust gas flow volume in the second exhaust gas pipe area to a liquid collection volume, the liquid drain channel area comprising an intermediate space formed between the first exhaust gas pipe area and the second exhaust gas pipe area, wherein a downstream end area of the first exhaust gas pipe area protrudes into an upstream end area of the second exhaust gas pipe area in the transition area such that the first exhaust gas pipe area and the second exhaust gas pipe area are in contact with one another in a first circumferential area in the transition area, the intermediate space having a sickle-shaped design between an outer surface of the first exhaust gas pipe area and an inner surface of the second exhaust gas pipe area being formed in a second circumferential area, wherein the first exhaust gas pipe area and the second exhaust gas pipe area are not in contact with one another in the second circumferential area in the transition area.

2. An exhaust gas duct system in accordance with claim 1 , wherein the second exhaust gas pipe area is expanded upstream towards a second exhaust gas pipe upstream end area in at least one direction which is at right angles to the exhaust gas flow direction.

3. An exhaust gas duct system in accordance with claim 2 , wherein the second exhaust gas pipe area has a flattened, round circumferential contour in the second exhaust gas pipe upstream end area.

4. An exhaust gas duct system in accordance with claim 3 , wherein the flattened, round circumferential contour is an oval or elliptical contour.

5. An exhaust gas duct system in accordance with claim 1 , wherein the transition area is arranged in a housing providing the liquid collection volume.

6. An exhaust gas duct system in accordance with claim 4 , wherein:
the housing comprises an inlet opening, wherein the first exhaust gas pipe area is led through the inlet opening into the interior of the housing; or
the housing comprises an outlet opening, wherein the second exhaust gas pipe area is led through the outlet opening from the interior of the housing; or
the housing comprises an inlet opening, wherein the first exhaust gas pipe area is led through the inlet opening into the interior of the housing and the housing comprises an outlet opening, wherein the second exhaust gas pipe area is led through the outlet opening from the interior of the housing.

7. An exhaust gas duct system in accordance with claim 6 , wherein:
the first exhaust gas pipe area comprises a first pipe section, which extends in the interior of the housing, provides the downstream end area of the first exhaust gas pipe area and is permanently connected to the housing in an area of the inlet opening; or
the second exhaust gas pipe area comprises a second pipe section, which extends in the interior of the housing, provides the upstream end area of the second exhaust gas pipe area and is permanently connected to the housing in the area of the outlet opening; or
the first exhaust gas pipe area comprises a first pipe section, which extends in the interior of the housing, provides the downstream end area of the first exhaust gas pipe area and is permanently connected to the housing in an area of the inlet opening and the second exhaust gas pipe area comprises a second pipe section, which extends in the interior of the housing, provides the upstream end area of the second exhaust gas pipe area and is permanently connected to the housing in the area of the outlet opening.

8. An exhaust gas duct system in accordance with claim 7 , wherein:
the first exhaust gas pipe area comprises a third pipe section, which is permanently connected to the first pipe section, in the area of the inlet opening; or
the second exhaust gas pipe area comprises a fourth pipe section permanently connected to the second pipe section, in the area of the outlet opening; or
the first exhaust gas pipe area comprises a third pipe section, which is permanently connected to the first pipe section, in the area of the inlet opening and the second exhaust gas pipe area comprises a fourth pipe section permanently connected to the second pipe section, in the area of the outlet opening.

9. An exhaust gas duct system in accordance with claim 5 , further comprising at least one plate shaped sound absorption element arranged in an interior of the housing.

10. An exhaust gas duct system in accordance with claim 9 , wherein:
the at least one sound absorption element surrounds the upstream end area of the second exhaust gas pipe area; or
the at least one sound absorption element is permanently connected to the upstream end area of the second exhaust gas pipe area; or
the at least one sound absorption element is permanently connected to the housing in a sound absorption element outer circumferential area; or
the sound absorption element comprises a first sound absorption opening arrangement or
any combination of:
the at least one sound absorption element surrounds the upstream end area of the second exhaust gas pipe area; and
the at least one sound absorption element is permanently connected to the upstream end area of the second exhaust gas pipe area; and
the at least one sound absorption element is permanently connected to the housing in a sound absorption element outer circumferential area; and
the sound absorption element comprises a first sound absorption opening arrangement.

11. An exhaust gas duct system in accordance with claim 5 , wherein the second exhaust gas pipe area has a second sound absorption opening arrangement downstream of the transition area in a second exhaust gas pipe area extending in the interior of the housing.

12. An exhaust gas duct system in accordance with claim 6 , wherein the housing comprises:
a first housing shell, which provides at least a part of the inlet opening and at least a part of the outlet opening; and
a second housing shell, which provides a part of the inlet opening, which part is not provided by the first housing shell and provides a part of the outlet opening, which part is not provided by the first housing shell, said second housing shell being permanently connected to the first housing shell.

13. An internal combustion engine exhaust gas duct system comprising:
a first exhaust gas pipe portion;
a second exhaust gas pipe portion fluidically connected to the first exhaust gas pipe portion in a transition area in an exhaust gas flow direction;
a liquid drain channel, in the transition area, in fluid communication with an exhaust gas flow volume of the first exhaust gas pipe portion and the second exhaust gas pipe portion; and
a liquid collection volume, whereby liquid entering from the downstream end area of the exhaust gas duct system is drained off from the exhaust gas flow volume via the liquid drain channel to the liquid collection volume, the liquid drain channel comprising an intermediate space defined by the first exhaust gas pipe portion and the second exhaust gas pipe portion, wherein a downstream end area of the first exhaust gas pipe portion protrudes into

Assignees

• Eberspächer Exhaust Tech Gmbh & Co Kg

Inventors

• Boriga Remus
• Marquardt-Stammberger Michael

Classifications

• F01N1/003

  by using dead chambers communicating with exhaust gas flow passages · CPC title

• F01N3/038 Primary

  by means of perforated plates defining expansion chambers associated with condensation and collection chambers · CPC title

• F01N13/1888 Primary

  the housing of the assembly consisting of two or more parts, e.g. two half-shells · CPC title

• F01N2490/15

  Plurality of resonance or dead chambers · CPC title

• F01N1/006

  comprising at least one perforated tube extending from inlet to outlet of the silencer · CPC title