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
  • F01N13/08—Other arrangements or adaptations of exhaust conduits
  • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
• • 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 exhaust 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
• • 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
• • 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
  • F01N1/14—Silencing apparatus characterised by method of silencing by adding air to exhaust gases
• • 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
  • F01N2490/00—Structure, disposition or shape of gas-chambers
  • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

• the present invention relates to an exhaust pipe outlet for vehicles and to an exhaust pipe integrating this outlet.
• the "sports" exhaust pipe is most often located at the end of the exhaust pipe coming from the engine, the outlet facing the outside at the rear of the vehicle.
• the pot has an internal pipe of larger diameter than the pipe of the inlet gas pipe.
• the conduit is perforated with holes which allows the relaxation in the pot ("pot"), being in the form of a closed sleeve which surrounds the perforated conduit.
• an additional chamber whose envelope forms, is adapted to the usual configuration, at the terminal outlet of the exhaust duct, that is to say the part generally visible at the rear of the vehicle. at least partially, a volume surrounding a section of pipe perforated on the wall and at least partially closed upstream, said pipe opening onto the outside.
• This system seems to generate an exit from the concentric gases, gases which advantageously disperse beyond the exit.
• a particularly advantageous anti-fouling effect has indeed been observed, which constitutes a particular feature of the present invention.
• an exhaust pipe can be equipped with an additional chamber, forming an expansion chamber and a single baffle with a transverse wall.
• the additional chamber communicates by one or more peripheral openings with a third chamber situated in its extension and comprising an annular volume whose distal part is closed but has an internal wall with holes to communicate with a hollow central cylindrical volume open on the outside.
• the exhaust gases expand in a conventional manner in the pot, then pass through a narrowing leading to a second expansion chamber having an opposite central wall obstructing the rectilinear path of the gas.
• the gas enters the third chamber through peripheral openings to a volume essentially annular before forming a central jet at the outlet, either via openings or perforations in the concentric internal cylinder or pipe delimiting the annular space or by accessing said central cylinder open at the internal end of the third chamber.
• the pot will generally but not necessarily be cylindrical or oval in section.
• the main body can be made up of a perforated central pipe and an envelope joined to the ends of the pipe by two perpendicular flanges with a hole in the center delimiting the conventional expansion chamber.
• the envelope extends and is closed at its end by a third flange having peripheral openings to a third chamber.
• the outlet will advantageously consist of an outer envelope (round, oval, rectangular or other) in which the ⁇ z, whether or not coming from a conventional exhaust pipe or directly from a catalytic system, penetrate, then leave by a perforated central pipe, at least partially closed upstream, which is extended by a cone giving to the open air.
• the cone can be removed and replaced by a flat flange.
• - figs. la and lb show a first example of a three-chamber exhaust system - fig. 2 shows a simplified embodiment of the invention in which there is no intermediate chamber
• - fig. 3 illustrates the placement of an outlet according to the invention to a pre-existing exhaust pipe
• FIGS. 8a and 8b illustrate the placement of an output element according to the invention
• FIG. 10 shows diagrams illustrating the invention in conjunction with the body of a vehicle.
• Fig. 1a shows an example of an exhaust pipe 1 according to the invention, of essentially cylindrical shape, comprising an inlet 2 of 50 mmm, a perforated duct 3 of 60 mm in diameter and about 400 mm in length, duct concentric to a outer casing 4 forming annular space 44 for main gas expansion, of conventional configuration, and forming a first chamber.
• the gas leaves this chamber at 5 to arrive in the expansion chamber 6 then passes through peripheral openings 7, in the third chamber 8 comprising a central cylindrical volume 9 and an annular volume 10 to finally reach the central terminal outlet 11 via openings 12 in the internal cylindrical wall 13 defining said volumes 9 and 10, openings 12 more particularly located at its distal part (rear).
• the gas in the annular space 10 can also reach the outlet passing through the cylindrical volume 9 open at its end 14.
• the central outlet 11 can advantageously be flared to form a divergent frustoconical mouth.
• a portion of conical wall 15 (fig. Lb) can partially overflow inwards into the cylindrical volume and thus create a volume from which the gas can only flow back to reach the terminal outlet or re-enter the annular space 10. This characteristic seems to favor the cleanliness of the exhaust outlet (absence of condensate).
• the three perpendicular flanges 20, 21, 22 are also shown, also shown in plan.
• Fig. 2 illustrates a first variant, particularly preferred, in which the outlet from the first expansion chamber gives directly onto the outlet chamber where a second expansion takes place, the obstacle to the rectilinear flow being constituted by the closed or partially closed end 19 of a hollow cylinder or concentric pipe provided with openings for bringing back the deflected and expanded gases towards the central outlet 11.
• the outlet part (element forming the third chamber of FIG. 1 or second chamber of FIG. 2) can be assembled to the preceding chambers at an angle, thus forming an angle of for example +/- 10 deg, preferably +/- 5 deg.
• This arrangement allows during assembly to adapt to the exhaust locations for several types of "universal" model car). It will actually be enough to turn the entire muffler around its longitudinal axis so that the outlet takes a desired orientation (upwards, downwards or to one side), the attachment points being chosen accordingly .
• the device of the invention can be located at a certain distance from a "conventional" exhaust constituting the first expansion chamber 50, instead of being integrated there directly at its outlet.
• the device of the invention 51 will therefore be connected by a pipe 52.
• the latter can play the role of second expansion chamber and the obstacle device 53 will constitute the third expansion chamber.
• This latter variant can also be combined with an air intake with concentric outlet, as illustrated in FIGS. 5 and 6 below.
• the exhaust pipe may in fact include an air passage taken from the pipe creating at the outlet a central flow capable of promoting the ejection of gases from the pipe by vacuum effect when the vehicle is at high speed.
• An air intake 30, 40 sends the air via a concentric central pipe 31, 41 to the flared outlet 35, 45.
• a flange 32 with central opening 38 is also illustrated. for the pipe 31, 41 and peripheral opening 37 according to the invention.
• the presence of the expansion chambers 36, 46 is again noted, preventing the exit of the gases in the form of a central flow, which constitutes one of the fundamental characteristics of the invention.
• the air duct passes longitudinally and centrally through the pot and causes cooling of the gas which is beneficial in terms of noise reduction and efficiency of the exhaust.
• a device 60 consisting of an outer envelope 61 (eg round, oval, rectangular) in which the gases coming from the exhaust penetrate , then leave the envelope by a central pipe 62 perforated laterally,.
• the pipe is closed at 63 on the side of the pot, the bottom 63 of the pipe can however also be perforated.
• the output 64 of the device need not be conical. However, it has been found that this configuration is particularly advantageous since the dirt at the outlet is considerably reduced. This feature is very interesting for Diesel vehicles.
• an outlet member 71 consisting of a perforated pipe of smaller diameter and of shorter length which is placed coaxially, the annular space thus formed is closed. on the exit side.
• the added pipe is closed, or partially closed, on the opposite side.
• This element is advantageously a perforated pipe, one end of which is closed and the other end, perforated or not, flares to adopt a dimension compatible with the fixing to said exhaust pipe.
• One of the other advantages of the device consists in the possibility of providing exhaust outlets 90 integrated in the vehicle body.
• the phenomenon of concentric rejection of gases will ensure that the dispersion will be further behind the outlet, thus avoiding 1 heating and body soiling
• the outside air intake X is in the direction of travel of the vehicle, which causes a pressure P.
• This pressure P generates a depression at A which facilitates the extraction of gases, thereby reducing the turbulence in the exhaust system.
• This system can be placed anywhere in the exhaust line, for example the manifold outlet, the piping, a pot, in the catalyst.
• Vacuum A is proportional to the speed of the vehicle. The more the engine goes up in revolutions / minute, the more the quantity of exhaust gases increases. As the speed increases, the depression at A therefore increases the suction increases. The evacuation of gases is improved so there is an increase in efficiency.

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• 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)

Publications (1)

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ID=25663211

Family Applications (1)

Country Status (3)

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Citations (3)

Family Cites Families (7)

• 2001
  • 2001-04-25 WO PCT/BE2001/000071 patent/WO2001081737A2/fr not_active Ceased
  • 2001-04-25 EP EP01927503A patent/EP1280983A2/de not_active Withdrawn
  • 2001-04-25 AU AU2001254532A patent/AU2001254532A1/en not_active Abandoned

Patent Citations (3)

Non-Patent Citations (1)

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