GB2265182A - I.c.engine exhaust system - Google Patents
I.c.engine exhaust system Download PDFInfo
- Publication number
- GB2265182A GB2265182A GB9205581A GB9205581A GB2265182A GB 2265182 A GB2265182 A GB 2265182A GB 9205581 A GB9205581 A GB 9205581A GB 9205581 A GB9205581 A GB 9205581A GB 2265182 A GB2265182 A GB 2265182A
- Authority
- GB
- United Kingdom
- Prior art keywords
- jacket
- space
- passage
- vacuum
- exhaust gas
- 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.)
- Withdrawn
Links
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
- F01N13/14—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 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
- F01N13/14—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 having thermal insulation
- F01N13/141—Double-walled exhaust pipes or housings
- F01N13/146—Double-walled exhaust pipes or housings with vacuum in the space between both walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Description
2265182 Exhaust System This invention relates to a method of handling
exhaust gases from an internal combustion engine, to an exhaust gas system for an internal combustion engine, as well as components therefor, and to a motor vehicle with such an exhaust system.
There is an increasing need to control the exhaust gas 10 output from internal combustion engines, for environmental and other reasons. Exhaust gases cause chemical pollution of the environment, and give rise to undesirable noise.
In an effort to reduce chemical Pollution from exhaust gases, catalytic convertors are widely fitted as part of the exhaust gas handling equipment, to convert noxious exhaust components into environmentally harmless components.
However such converters only operate satisfactorily within a particular operating temperature range.
According to the invention, there is provided a method of handling exhaust gases from an internal combustion engine, wherein the gases are carried along a passage, and the passage is surrounded by a vacuum contained within a jacket around the passage.
The use of a vacuum jacket provides insulation between the gases and the environment, and can assist in reducing noise propagation from the exhaust gas stream.
Where a catalytic converter is fitted in the exhaust gas passage, the use of a vacuum jacket can help the catalyst to reach its operating temperature more quickly than would be the case without the thermal insulation provided by the jacket.
Where the intake manifold of the engine is able to act as a source of vacuum, then vacuum may be supplied f rom the manifold to the jacket around the passage. In other applications however the vacuum may be supplied to the jacket from an engine driven or an electrically driven vacuum pump. A check valve may be placed in the vacuum line leading from the intake manifold to the jacket, to allow air to be evacuated from the jacket but to prevent readmission of air to the jacket.
According to a second aspect of the invention, there is provided an exhaust gas system for a motor vehicle in which a passage for exhaust gases leaving the engine is surrounded by a jacket, and a vacuum source is connected to the space between the jacket and the passage.
If the exhaust gas passage includes a catalytic converter, then the jacket preferably surrounds at least that part of the passage containing the converter.
The space between the jacket and the passage is preferably in communication with the engine intake manifold via a vacuum line so that the vacuum in the manifold is used to evacuate the space. A check valve is preferably fitted in the line to prevent readmission of air to the space.
The invention also provides an exhaust pipe for a motor vehicle, the pipe comprising a central passage for exhaust gases surrounded by a jacket, the jacket defining a sealed space around the central passage, with an aperture communicating with the space and adapted to connect the space to a vacuum source.
The invention can also be applied to an exhaust manifold and/or to an exhaust gas down pipe (being parts of an 1 exhaust gas system), and accordingly the invention also provides an exhaust manifold and/or an exhaust gas down pipe comprising a central passage f or exhaust gases surrounded by a jacket, the jacket defining a sealed space around the central passage, with an aperture communicating with the space and adapted to connect the space to a vacuum source.
The invention will now be described, by way of example, with reference to the accompanying drawing which is a schematic view of an exhaust system in accordance with the invention.
In the drawing, an engine block 10 of an internal combustion engine has an intake manifold 12 and an exhaust manifold 14. Exhaust gases pass through the manifold 14, along a down pipe 16 and along an exhaust pipe 18. A catalyst brick 20 is fitted in a catalytic converter housing 22 such that the exhaust gases pass through the brick. The flow of exhaust gases is indicated by arrows 24.
The exhaust gas passage, consisting of the manifold 14, the down pipe 16 and the exhaust pipe 18 are all surrounded by a jacket 26 which defines a space 28 around the passage. Where the exhaust gas passage is in the form of a tube, then jacket is in the form of an outer tube surrounding the tube which forms the passage. Where the exhaust gas passage is other than a simple tube, then the jacket will be correspondingly shaped so as to surround the walls of the passage to form a space 28 between the jacket and the passage which has a width of about 4 mm.
In practice, the manifold 14, the downpipe 16 and the exhaust pipe 18 may be separate components joined to one another by appropriate flanges. In such a case each component may have its own, sealed jacket 26 or the jackets 26 around each component may communicate with one another to - 4 provide a single vacuum space.
In order to evacuate the vacuum space between the jacket 26 and the exhaust gas passage, a vacuum line 30 links the space 28 with the intake manifold 12. A check valve 32 is fitted in this line. When the engine is running, a vacuum is normally produced in the intake manifold. This vacuum causes air to be drawn out of the space 28 through the line 30. The check valve 32 ensures that the space 28 is connected to the manifold when manifold vacuum is high (eg 70kPa), so that an equivalent vacuum can be drawn in the space 28. However when manifold vacuum drops (eg because the engine is heavily loaded), then the valve 32 closes to maintain the higher level of vacuum in the space.
The result of vacuum in the space 28 is that the exhaust passage is insulated, both thermally and in terms of sound, from the environment. The inherent heat of the exhaust gases will therefore heat up the catalyst brick 20 more rapidly then would be the case without the jacket 26, and the noise resulting from the expulsion of the exhaust gas from the engine will be reduced.
1 claims 1. A method of handling exhaust gases f rom an internal combustion engine, wherein the gases are carried along a passage, and the passage is surrounded by a vacuum contained within a jacket around the passage.
Claims (1)
- 2. A method as claimed in Claim 1, wherein the vacuum is supplied from theintake manifold of the engine.3. A method as claimed in Claim 1, wherein the vacuum is supplied f rom a vacuum pump associated with the engine installation.4. A method as claimed in Claim 2 or claim 3, wherein a check valve is placed in the vacuum line leading from the intake manifold to the jacket, to allow air to be evacuated from the jacket but to prevent readmission of air to the jacket.5. An exhaust gas system for a motor vehicle in which a passage for exhaust gases leaving the engine is surrounded by a jacket, and a vacuum source is connected to the space between the jacket and the passage.6. An exhaust gas system as claimed in Claim 5, wherein the exhaust gas passage includes a catalytic converter and the jacket surrounds at least that part of the passage containing the converter.7. An exhaust gas system as claimed in any one of Claims 5 to 6, wherein the space between the jacket and the passage is in communication with the engine intake manifold via a vacuum line so that the vacuum in the manifold is used to 35 evacuate the space.6 - 8. An exhaust gas system as claimed in claim 7, wherein a check valve is fitted in the line to prevent readmission of air to the space.9. An exhaust pipe for a motor vehicle, the pipe comprising a central passage f or exhaust gases surrounded by a jacket, the jacket defining a sealed space around the central passage, with an aperture communicating with the space and adapted to connect the space to a vacuum source.10. An exhaust manifold comprising a central passage for exhaust gases surrounded by a jacket, the jacket defining a sealed space around the central passage. with an aperture dommunicating with the space and adapted to connect the space to a vacuum source.11. An exhaust gas down pipe for an internal combustion engine comprising a central passage for exhaust gases surrounded by a jacket, the jacket defining a sealed space around the central passage, with an aperture communicating with the space and adapted to connect the space to a vacuum source.12. A method of handling exhaust gases, substantially as herein described with reference to the accompanying drawing.13. An exhaust gas system substantially as herein described with reference to the accompanying drawing.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9205581A GB2265182A (en) | 1992-03-13 | 1992-03-13 | I.c.engine exhaust system |
EP93301877A EP0560616A1 (en) | 1992-03-13 | 1993-03-12 | Exhaust system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9205581A GB2265182A (en) | 1992-03-13 | 1992-03-13 | I.c.engine exhaust system |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9205581D0 GB9205581D0 (en) | 1992-04-29 |
GB2265182A true GB2265182A (en) | 1993-09-22 |
Family
ID=10712127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9205581A Withdrawn GB2265182A (en) | 1992-03-13 | 1992-03-13 | I.c.engine exhaust system |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0560616A1 (en) |
GB (1) | GB2265182A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19813590B4 (en) * | 1998-03-27 | 2004-12-16 | Audi Ag | Exhaust component for internal combustion engines |
CN1454288A (en) * | 2000-08-18 | 2003-11-05 | 刘俊富 | An anti-scald exhaust muffler |
DE102008051278B4 (en) | 2008-10-10 | 2013-12-05 | Audi Ag | Method for operating an exhaust system and exhaust system for internal combustion engines |
DE102010031853A1 (en) | 2010-07-22 | 2012-01-26 | J. Eberspächer GmbH & Co. KG | exhaust system |
DE102011007854A1 (en) * | 2011-04-21 | 2012-10-25 | J. Eberspächer GmbH & Co. KG | Exhaust system component |
FR2995352B1 (en) * | 2012-09-13 | 2017-12-22 | Renault Sas | MOTOR VEHICLE COMPRISING AN INTERNAL COMBUSTION ENGINE, A CATALYST AND A CATALYST INSULATION DEVICE |
JP2020029832A (en) * | 2018-08-24 | 2020-02-27 | 株式会社豊田自動織機 | Suction/exhaust structure of internal combustion engine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1519467A (en) * | 1974-11-26 | 1978-07-26 | Fuji Heavy Ind Ltd | Exhaust gas purification system for an internal combustiongasoline engine |
US4250708A (en) * | 1976-05-18 | 1981-02-17 | Toyota Jidosha Kogyo Kabushiki Kaisha | Exhaust double pipe of an internal combustion engine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH302270A (en) * | 1952-11-06 | 1954-10-15 | Grognuz Willy | Silent exhaust system for internal combustion engine. |
DE3238330C2 (en) * | 1982-10-15 | 1985-10-03 | Bayerische Motoren Werke AG, 8000 München | Exhaust manifolds for internal combustion engines |
FR2573176A1 (en) * | 1984-11-12 | 1986-05-16 | Marc Guerra | Method for thermal insulation |
DE3537080C1 (en) * | 1985-10-18 | 1987-06-19 | Benteler Werke Ag | Exhaust pipe with built-in exhaust gas catalyst - and outer insulation coating contg. evacuated cavity with chamber filled with better alloy |
FR2644207A1 (en) * | 1989-03-07 | 1990-09-14 | Renault | Exhaust manifold for an internal combustion engine |
JPH0454213A (en) * | 1990-06-22 | 1992-02-21 | Calsonic Corp | Double exhaust gas pipe device |
JPH04187810A (en) * | 1990-11-20 | 1992-07-06 | Calsonic Corp | Cooling and temperature keeping device for exhaust manifold |
-
1992
- 1992-03-13 GB GB9205581A patent/GB2265182A/en not_active Withdrawn
-
1993
- 1993-03-12 EP EP93301877A patent/EP0560616A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1519467A (en) * | 1974-11-26 | 1978-07-26 | Fuji Heavy Ind Ltd | Exhaust gas purification system for an internal combustiongasoline engine |
US4250708A (en) * | 1976-05-18 | 1981-02-17 | Toyota Jidosha Kogyo Kabushiki Kaisha | Exhaust double pipe of an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP0560616A1 (en) | 1993-09-15 |
GB9205581D0 (en) | 1992-04-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |