US20080083216A1 - Double-walled exhaust manifold - Google Patents
Double-walled exhaust manifold Download PDFInfo
- Publication number
- US20080083216A1 US20080083216A1 US11/575,713 US57571305A US2008083216A1 US 20080083216 A1 US20080083216 A1 US 20080083216A1 US 57571305 A US57571305 A US 57571305A US 2008083216 A1 US2008083216 A1 US 2008083216A1
- Authority
- US
- United States
- Prior art keywords
- manifold
- manifold element
- external
- internal
- tubes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
- F01N13/102—Other arrangements or adaptations of exhaust conduits of exhaust manifolds having thermal insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
Definitions
- the invention relates to a double-walled exhaust manifold for a motor vehicle.
- the invention relates more particularly to a double-walled exhaust manifold for a motor vehicle, of the type provided with at least one internal manifold element and one external manifold element, of the type in which the internal manifold element is provided with at least two coaxial tubes nested slidingly one inside the other, and of the type in which the external manifold element is cast in one piece around the internal manifold element, with which it defines an internal insulating cavity disposed between the internal manifold element and the external manifold element.
- U.S. Pat. No. 4,182,122 describes and illustrates a manifold of the type described in the foregoing, wherein the internal manifold element is provided with at least one internal tube of “T” shape, whose central branch is connected to an exhaust conduit of the cylinder head and whose symmetric branches, with their axis intersecting the axis of the central branch, are each connected slidingly to at least one other internal tube.
- the internal manifold element is provided with at least one internal tube of “T” shape, whose central branch is connected to an exhaust conduit of the cylinder head and whose symmetric branches, with their axis intersecting the axis of the central branch, are each connected slidingly to at least one other internal tube.
- the internal connector element is separated from the external manifold element by a “T” shaped insulator made in two pats and mounted with clearance between the internal manifold element and the external manifold element.
- the insulator actually ensures that the external manifold element will not be exposed to excessively high temperatures. To the contrary, it concentrates the heat resulting from the rise in temperature of the internal manifold element around that element.
- the “T” shape of the aforesaid internal tube subjects it to elevated mechanical constraints when it expands as a result of the rise in temperature of the internal manifold element. This expansion, which is not compensated between the central branch and the symmetric branches of the internal “T” tube, may result in rupture thereof.
- the invention remedies these drawbacks by proposing a manifold in which, on the one hand, the external manifold element is insulated from the internal manifold element and, on the other hand, in which all the internal tubes of the internal manifold element are tubes of substantially long shape mounted slidingly one inside the other in such a way as to absorb the deformations resulting from the rise in temperature of the manifold during use thereof.
- the invention proposes a manifold of the type described hereinabove, characterized in that the internal manifold element is provided with at least one straight first upstream tube, a first end of which is disposed in the extension of an exhaust conduit of a cylinder head of an associated heat engine, and a second end of which is nested slidingly with an intermediate part of at least one downstream tube whose axis intersects the axis of the said first upstream tube, thus permitting expansion of the said internal manifold element during the rise in temperature of the manifold.
- the invention also proposes a method for manufacturing an exhaust manifold of the type described hereinabove, characterized in that it includes at least:
- FIG. 1 is a schematic view in longitudinal section of a manifold according to the invention
- FIG. 2 is a schematic view in transverse section of the manifold of FIG. 1 ;
- FIG. 3 is a schematic view in longitudinal section of a manifold according to an alternative embodiment
- FIG. 4 is a schematic view in transverse section of the manifold of FIG. 3 .
- the figures illustrate the entirety of a double-walled exhaust manifold 10 for a motor vehicle.
- manifold 10 is provided with at least one internal manifold element 12 and one external manifold element 14 .
- External manifold element 14 is provided with a first flange 13 intended to be fixed to the cylinder head (not illustrated) of an associated engine, and with a second flange 15 intended to be fixed to an exhaust pipe (not illustrated) of the vehicle.
- internal manifold element 12 is provided with at least two coaxial tubes 16 , 13 nested slidingly one inside the other in order to permit a certain expansion of internal manifold element 12 when it is subjected to a temperature rise.
- external manifold element 14 is cast in known manner in one piece around internal manifold element 12 , with which it defines an internal insulating cavity 20 disposed between internal manifold element 12 and external manifold element 14 .
- this cavity 20 makes it possible to insulate external manifold element 14 from the heat released by internal manifold element 12 during the rise in temperature of manifold 10 , without interposing any insulation whatsoever between the two manifold elements 12 , 14 and thus risking concentrating the heat on internal manifold element 12 .
- internal manifold element 12 is provided with at least one straight first upstream tube 22 , a first end 24 of which is disposed in the extension of an exhaust conduit (not illustrated) of a cylinder head of an associated heat engine, and a second end 26 of which is nested slidingly with an intermediate part 28 of at east one downstream tube 16 , 18 , whose axis “B” intersects axis “A” of the said upstream tube 22 , thus permitting expansion of the said internal manifold element 12 during the rise in temperature of manifold 10 .
- exhaust manifold 10 is provided with at least one elbowed second upstream tube 30 , a first end 32 of which is disposed in the extension of an exhaust conduit (not illustrated) of the cylinder head, and a second end 34 of which, whose axis “B” intersects axis “A” of the first end, is nested slidingly with end 36 of a downstream tube 18 .
- exhaust manifold 10 is provided with at least two downstream tubes 16 , 18 , one end 38 of one downstream tube 16 being nested slidingly with end 40 of the other downstream tube 18 .
- manifold 10 is provided with two straight first upstream tubes 22 , an elbowed second upstream tube 30 , and two downstream tubes 16 , 18 , the intermediate parts 28 of which receive the first two upstream tubes 22 .
- One end 42 of downstream tube 16 communicates with an outlet orifice 44 of manifold 10 .
- external manifold element 14 is cast in such a way that it confines at least one first end 24 , 32 of an upstream tube 22 , 30 and one end 42 of a downstream tube 16 .
- This configuration established during casting of external manifold element 14 , allows internal manifold element 12 to be joined simply and effectively to external manifold element 14 . It is then external manifold element 14 that is connected respectively to the cylinder head of the associated engine and to the rest of the exhaust system of the vehicle, Tubes 16 , 18 , 22 , 30 of the internal manifold element are made of steel to facilitate confinement of their ends by external manifold element 14 .
- external manifold element 14 is provided with a bore 46 , which communicates with internal insulating cavity 20 to permit evacuation of a sand core used to form insulating cavity 20 during casting of the said external manifold element 14 .
- exhaust manifold 10 can be produced very simply according to a method that includes at least:
- the invention therefore makes it possible in simple and effective manner, to make a “double-walled” exhaust manifold 10 in which the expansion of tubes 16 , 18 , 22 , 30 of internal element 12 is absorbed by mechanical clearances in all directions, in such a way that it does not affect the strength of the said manifold 10 .
- the end ( 24 ) of the straight first upstream tube ( 22 ) and the first end ( 32 ) of the elbowed second upstream tube ( 30 ) can extend to the first face ( 13 ) of the external manifold element ( 14 ).
- the end ( 42 ) of the downstream tube ( 16 ) can extend to the second face ( 15 ) of the external manifold element ( 14 ).
- This alternative makes it possible to avoid confining at least one first end 24 , 32 of an upstream tube 22 , 30 and one end 42 of a downstream tube 16 , as was described hereinabove with reference to FIGS. 1 and 2 .
- Ends 24 and 32 which extend to first face 13 of external element 14 , can be in contact with the ends of the exhaust conduits of the cylinder head.
- end 42 which extends to second face 15 of external element 14 , can be in contact with one end of the exhaust pipe of the engine.
- This configuration ensures leaktightness relative to the exhaust gas of the engine.
- external element 14 is not in direct contact with the exhaust gases, there are no risks of corrosion.
- tubes 22 , 30 and 16 are positioned, relative to the mold used to make external element 14 , in such a way that they protrude beyond this external element 14 once this casting operation has been completed. It is necessary, however, to provide an operation of machining of these tubes, to eliminate the protruding segments. This operation can be performed at the same the operation of machining of manifold 10 .
- Manifold 10 can be provided with means for preventing axial displacement of the ends 24 , 32 and 42 of upstream tubes 22 , 30 and downstream tube 16 that extend to faces 13 and 15 of external element 14 .
- Such means are annular grooves or shoulders made on upstream tubes 22 , 30 and downstream tube 16 at the position of the segments in contact with external element 14 , in such a way that, during casting of external element 14 , the molten material defines a shape complementary to those means in order to prevent axial displacement. Consequently, ends 24 , 32 and 42 will be fixed relative to external element 14 , and will always be able to ensure contact with the ends of the exhaust conduits of the cylinder head and of the exhaust pipe.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0410295A FR2875845A1 (fr) | 2004-09-29 | 2004-09-29 | Collecteur d'echappement a double paroi |
FR0410295 | 2004-09-29 | ||
FR0453071 | 2004-12-20 | ||
FR0453071A FR2879652A1 (fr) | 2004-12-20 | 2004-12-20 | Collecteur d'echappement a double paroi |
PCT/FR2005/050792 WO2006035188A1 (fr) | 2004-09-29 | 2005-09-29 | Collecteur d'echappement a double paroi |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080083216A1 true US20080083216A1 (en) | 2008-04-10 |
Family
ID=35457970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/575,713 Abandoned US20080083216A1 (en) | 2004-09-29 | 2005-09-29 | Double-walled exhaust manifold |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080083216A1 (fr) |
EP (1) | EP1797294A1 (fr) |
JP (1) | JP2008514863A (fr) |
WO (1) | WO2006035188A1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090007552A1 (en) * | 2007-06-13 | 2009-01-08 | Michael Paul Schmidt | Exhaust manifold having improved NVH characteristics |
US20130220265A1 (en) * | 2012-02-28 | 2013-08-29 | Honda Motor Co., Ltd. | Cylinder head |
US20130232960A1 (en) * | 2012-03-08 | 2013-09-12 | Calsonic Kansei Corporation | Dual pipe exhaust manifold |
US10610845B2 (en) * | 2012-08-09 | 2020-04-07 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes George Claude | Exhaust system for a steam reformer and bearing therefor |
EP3708798A1 (fr) | 2019-03-13 | 2020-09-16 | GF Casting Solutions AG | Collecteur de gaz d'échappement isolé par une fente d'air |
US11149621B2 (en) * | 2017-11-20 | 2021-10-19 | Weichai Power Co., Ltd | Exhaust pipe assembly and engine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3729937A (en) * | 1971-12-17 | 1973-05-01 | Gen Motors Corp | Engine exhaust reactor and method of making |
US4182122A (en) * | 1978-02-15 | 1980-01-08 | Caterpillar Tractor Co. | Insulated exhaust manifold |
US5419127A (en) * | 1993-11-22 | 1995-05-30 | Soundwich Inc | Insulated damped exhaust manifold |
US5697155A (en) * | 1993-11-18 | 1997-12-16 | Mercedes-Benz Ag | Method of manufacturing a branched pipe by internal high-pressure forming |
US6427440B1 (en) * | 1999-05-21 | 2002-08-06 | Daimlerchrysler Ag | Built-up airgap-insulated exhaust manifold of a motor vehicle and method for producing it |
US20050072143A1 (en) * | 2003-10-07 | 2005-04-07 | Friedrich Boysen Gmbh & Co. Kg | Air-gap manifold |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4226715A1 (de) * | 1992-08-12 | 1994-02-17 | Eberspaecher J | Abgaskrümmer |
DE19909934C1 (de) * | 1999-03-06 | 2001-01-11 | Daimler Chrysler Ag | Luftspaltisolierter Abgaskrümmer zur Abgasführung aus einer Brennkraftmaschine |
-
2005
- 2005-09-29 WO PCT/FR2005/050792 patent/WO2006035188A1/fr active Application Filing
- 2005-09-29 US US11/575,713 patent/US20080083216A1/en not_active Abandoned
- 2005-09-29 EP EP05800624A patent/EP1797294A1/fr not_active Withdrawn
- 2005-09-29 JP JP2007534062A patent/JP2008514863A/ja not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3729937A (en) * | 1971-12-17 | 1973-05-01 | Gen Motors Corp | Engine exhaust reactor and method of making |
US4182122A (en) * | 1978-02-15 | 1980-01-08 | Caterpillar Tractor Co. | Insulated exhaust manifold |
US5697155A (en) * | 1993-11-18 | 1997-12-16 | Mercedes-Benz Ag | Method of manufacturing a branched pipe by internal high-pressure forming |
US5419127A (en) * | 1993-11-22 | 1995-05-30 | Soundwich Inc | Insulated damped exhaust manifold |
US6427440B1 (en) * | 1999-05-21 | 2002-08-06 | Daimlerchrysler Ag | Built-up airgap-insulated exhaust manifold of a motor vehicle and method for producing it |
US20050072143A1 (en) * | 2003-10-07 | 2005-04-07 | Friedrich Boysen Gmbh & Co. Kg | Air-gap manifold |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090007552A1 (en) * | 2007-06-13 | 2009-01-08 | Michael Paul Schmidt | Exhaust manifold having improved NVH characteristics |
US20130220265A1 (en) * | 2012-02-28 | 2013-08-29 | Honda Motor Co., Ltd. | Cylinder head |
US8910608B2 (en) * | 2012-02-28 | 2014-12-16 | Honda Motor Co., Ltd. | Cylinder head |
US20130232960A1 (en) * | 2012-03-08 | 2013-09-12 | Calsonic Kansei Corporation | Dual pipe exhaust manifold |
CN103306795A (zh) * | 2012-03-08 | 2013-09-18 | 康奈可关精株式会社 | 双管式排气歧管 |
US10610845B2 (en) * | 2012-08-09 | 2020-04-07 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes George Claude | Exhaust system for a steam reformer and bearing therefor |
US11149621B2 (en) * | 2017-11-20 | 2021-10-19 | Weichai Power Co., Ltd | Exhaust pipe assembly and engine |
EP3708798A1 (fr) | 2019-03-13 | 2020-09-16 | GF Casting Solutions AG | Collecteur de gaz d'échappement isolé par une fente d'air |
Also Published As
Publication number | Publication date |
---|---|
JP2008514863A (ja) | 2008-05-08 |
WO2006035188A1 (fr) | 2006-04-06 |
EP1797294A1 (fr) | 2007-06-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |