EP0708880A1 - Fishbone standardised silencers for (internal) combustion engines - Google Patents
Fishbone standardised silencers for (internal) combustion enginesInfo
- Publication number
- EP0708880A1 EP0708880A1 EP95933221A EP95933221A EP0708880A1 EP 0708880 A1 EP0708880 A1 EP 0708880A1 EP 95933221 A EP95933221 A EP 95933221A EP 95933221 A EP95933221 A EP 95933221A EP 0708880 A1 EP0708880 A1 EP 0708880A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- silencers
- design
- silencer
- exhaust
- performance
- 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.)
- Granted
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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
Definitions
- the silencer is composed by a cylindrical enclosure (1) - wi preferably a near circular or elliptic cross section-, closed both ends by end caps (2), through which the up- (3) and do stream pipes (4) pass.
- This enclosure is subdivided longitudinally into a high numb of shallow cells, by transversal diaphragms (5).
- the (exhaust) gas flows through (circular) holes in t diaphragms, approx. the same diameter as the up- a downstream pipe diameter, and aligned with these.
- a high passage rate perforated pipe or mesh (6) may or may n be running through the diaphragm holes (fig. 1 & 2). T perforated pipe would facilitate the assembly and impro further the gas flow, and heat exchange.
- the fishbone subdivision may be obtained by t introduction of a cartridge (ceramic, sintered, etc.) (fig 5 p. 1 or the silencer might be produced as a monolithic constructi
- the shallowness of the cells can be defined by the ratios ai and ai which should be d t respectively ⁇ ⁇ .o and ⁇ o.5 where t is the mean enclosure transversal dimension and d t diaphragm aperture (fig 1-6, p. 9-11); ai, the axial dimension the respective cells, can be choosen constant or varia optimising the silencer acoustic performance for its specific ta (noise reduction for particular frequency ranges). See Fig. 3 p. 10.
- Silencer design is still largely empirical, due to its diffic mathematical analysis. For silencers of this new configurati tests can easily be set up to find out the optimum design. T comes down to determining ai, for given overall dimensions. DESCRIPTION
- the new silencer is made of one single materi (fig. 1-4, p. 9-10; fig. 6, p. 11) or, alternatively, is fitted with ( cartridge(s), which is (are) easily introduced or exchanged f overhaul (Fig. 5 p. 11).
- this concept implies a generally cylindric shape.
- Cross sections should be near circular or elliptic, while they a acoustically the stiffest, and allow the thinnest mantle materi thickness, avoiding shell noise.
- the diaphragms should be stiff enough and well clamped, not transmit noise to the next cell by vibrating themselves. They c be doubly curved (stamped) for maximum stiffness and lightnes See fig. 2 p. 9.
- Their clamping can be by heat-shrinking of the mantle arou them (either of a complete cylinder which is heated, or by t shrinkage of 1 or 2 longitudinal welds, (1 open shell or 2 pa shells) f.i.
- the gas flow channel can be concentric but may be eccentr (fig. 3 & 4 p. 10). DESCRIPTION
- the author proposes thus an inversion of the (car) muffler design and selection procedure : instead of filling up available space under the car with custom designed volumes of mufflers, the car designers would accept from the start that they be cylindrical, with a limited but handsome number of standardised cross-sections and pipe eccentricities to choose from, and provide space for these under the body.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1992/002290 WO1993019287A1 (en) | 1992-10-02 | 1992-10-02 | Fishbone standardised silencers for (internal) combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0708880A1 true EP0708880A1 (en) | 1996-05-01 |
EP0708880B1 EP0708880B1 (en) | 1998-07-08 |
Family
ID=8165688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95933221A Expired - Lifetime EP0708880B1 (en) | 1992-10-02 | 1992-10-02 | Fishbone standardised silencers for (internal) combustion engines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0708880B1 (en) |
AT (1) | ATE168167T1 (en) |
AU (1) | AU2679992A (en) |
WO (1) | WO1993019287A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0018620D0 (en) * | 2000-07-28 | 2000-09-13 | Draftex Ind Ltd | Noise attenuation arrangements for pressurised-gas conduits |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2502709A (en) * | 1940-11-01 | 1950-04-04 | Harley A Dorman | Exhaust muffler including plural venturi elements |
US3655010A (en) * | 1970-07-17 | 1972-04-11 | Tenneco Inc | Acoustic conduit with wrinkle section |
US4287962A (en) * | 1977-11-14 | 1981-09-08 | Industrial Acoustics Company | Packless silencer |
DE3101252A1 (en) * | 1981-01-16 | 1982-09-02 | Alcan Aluminiumwerke GmbH, 3400 Göttingen | EXHAUST SILENCER FOR INTERNAL COMBUSTION ENGINES AND METHOD FOR THE PRODUCTION THEREOF |
-
1992
- 1992-10-02 EP EP95933221A patent/EP0708880B1/en not_active Expired - Lifetime
- 1992-10-02 AT AT95933221T patent/ATE168167T1/en not_active IP Right Cessation
- 1992-10-02 AU AU26799/92A patent/AU2679992A/en not_active Abandoned
- 1992-10-02 WO PCT/EP1992/002290 patent/WO1993019287A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9319287A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0708880B1 (en) | 1998-07-08 |
AU2679992A (en) | 1993-10-21 |
ATE168167T1 (en) | 1998-07-15 |
WO1993019287A1 (en) | 1993-09-30 |
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Legal Events
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