WO2002103173A1 - Abgasklappe - Google Patents
Abgasklappe Download PDFInfo
- Publication number
- WO2002103173A1 WO2002103173A1 PCT/EP2002/006027 EP0206027W WO02103173A1 WO 2002103173 A1 WO2002103173 A1 WO 2002103173A1 EP 0206027 W EP0206027 W EP 0206027W WO 02103173 A1 WO02103173 A1 WO 02103173A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust
- flap
- flow
- flow body
- duct
- Prior art date
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
- F01N13/085—Other arrangements or adaptations of exhaust conduits having means preventing foreign matter from entering exhaust conduit
-
- 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
- F01N2290/00—Movable parts or members in exhaust systems for other than for control purposes
- F01N2290/02—Movable parts or members in exhaust systems for other than for control purposes with continuous rotary movement
- F01N2290/04—Movable parts or members in exhaust systems for other than for control purposes with continuous rotary movement driven by exhaust gases
Definitions
- the present invention relates to an exhaust valve for an exhaust system of an internal combustion engine.
- Exhaust flaps of this type serve to close the exhaust duct of an exhaust system. It may be desirable to close the entire cross section of the exhaust duct with the exhaust flap. However, it is equally possible to close only a partial area of the cross section of the exhaust duct with the exhaust flap. Furthermore, it is also possible to subdivide the exhaust gas duct into a plurality of subchannels and to also connect these subchannels in parallel. The exhaust flap according to the invention is then also suitable for completely or partially closing such a partial duct, while the parallel partial duct can work without an exhaust flap.
- the exhaust flaps are usually designed in such a way that they can be folded either in different stages or continuously so that the initially closed cross section of the exhaust duct can be opened. In particular, it is possible to flip the exhaust flap back and forth between a closed position in which the exhaust duct is completely closed and an open position in which the exhaust duct is fully open.
- the exhaust flaps according to the invention can be used both in the hot and in the cold area of the exhaust system.
- a typical field of application is the function as a valve, for example for controlling a bypass to bypass a heat exchanger or catalyst.
- Another typical field of application is the closing of a tailpipe.
- it is also common to open and close various flow paths within the silencer in the area of sound attenuation with the aid of exhaust flaps.
- DE-C-199 35 711 discloses a silencer with an exhaust flap, in which an exhaust gas flow acts directly on an actuating element in order to actuate a closure element which forms the actual exhaust gas flap.
- a disadvantage of this construction is the need to provide both an actuating element and a closure element.
- the invention is based on the object of structurally simplifying an exhaust flap while at the same time ensuring stable operating behavior. This object is achieved by the combination of features of claim 1 in an inventive manner.
- the basic idea of the invention is to provide a closing plate that fulfills the closing function on the exhaust flap and to additionally arrange a flow body in addition to the closing plate.
- the closure plate and flow body are consequently connected to one another and, as parts of the exhaust plate, also pivot synchronously with one another.
- the flow body can be arranged next to each of the four sides of this rectangle in relation to a rectangular closure plate.
- the closure plate can be designed so that it completely closes the exhaust duct in the closed position. It is equally possible with the invention to close only a partial area of the cross section of the exhaust duct. Since the sealing plate is arranged directly in the exhaust duct, the exhaust gas flow also strikes the inner surface of the sealing gap facing it. The exhaust gas stream consequently exerts a dynamic pressure on the inner surface of the closure plate.
- This dynamic pressure is used as an opening force for the closing plate and thus for the exhaust plate.
- the exhaust flap can open up to a certain opening angle. Practical tests have shown that, for example on acoustically effective exhaust gas flaps, an opening angle of approximately 30 ° can be achieved with the aid of the dynamic pressure.
- the dynamic pressure exerted on the inside of the closure plate is not sufficient to open the exhaust flap completely, in particular because the opening movement of the exhaust flap is additionally hampered by the force of a return element usually designed as a return spring. As soon as the exhaust flap opens and the flow body is no longer covered, the exhaust gas flow begins to flow towards the flow body arranged next to the closure plate.
- Another advantage of the invention is the fact that in addition to the exhaust flap there are no other moving parts that have to be stored in a complex manner. Rather, the exhaust flap is designed as an integral component which simultaneously fulfills both the actuating function and the closing function of an exhaust flap.
- the exhaust flap at the end of a duct section in the exhaust duct.
- the arrangement in the region of the end of a duct section has the advantage that the mounting for the exhaust flap can be arranged outside the exhaust duct and thus outside the exhaust gas flow. In this way the
- Flow of the exhaust gas flow in the exhaust gas duct is not impeded by the storage. It is also possible to adapt the size of the exhaust duct to the exhaust gas flow and thus optimize the flow behavior in the exhaust duct. Finally, it is advantageous to provide the exhaust flap with a return spring in order to prevent undesirable noise, for example rattling when the flap is closed or when the back pressure is less on the exhaust flap.
- Claim 3 teaches a structurally simple and at the same time very effective construction of the exhaust flap. Due to its U-shaped cross-section, the exhaust duct is closed very effectively by the exhaust flap.
- This structure is consistently developed according to the teaching of claim 4, according to which the side walls of the exhaust flap are extended to form a fork-like receptacle of the flow body between the flap side walls.
- Claims 5, 6 and 7 relate to alternative configurations of the flow body. It is thus possible to design the flow body as a flat plate in the same way as for the closure plate. The construction is very simple. Alternatively, a curved shape of the flow body can also be considered to improve the flow behavior.
- the embodiment according to claim 7 is considered to be particularly expedient, according to which the flow body is designed in the manner of an airfoil. Similar to the wing of an aircraft, the end face of the wing is first flown against and the exhaust gas flow is divided into two.
- Fig. 1 is a side view of an exhaust duct end with the exhaust flap completely closed
- Fig. 2 shows the view of Fig. 1 with the exhaust flap partially open
- Fig. 3 shows the view of Fig. 1 with the exhaust flap fully open
- FIG. 4 shows the front view in the exhaust duct according to arrow IV in FIG. 3
- Fig. 5 is a bottom view of the exhaust valve
- FIG. 6 is a front view of the exhaust flap according to arrow VI in FIG. 5
- FIG. 7 shows a schematic illustration of the rotary mounting of the exhaust flap on the exhaust duct according to arrow VII in FIG. 4
- FIG. 8 shows a further side view of an exhaust duct end with an embodiment of an exhaust flap with a plurality of flow bodies in the closed position
- Fig. 9 schematic diagrams of three functional positions of the exhaust flap as well as the curve of the back pressure curve and the curve of the opening angle plotted against the mass flow.
- Exhaust gas duct 1 in FIG. 1 has an exhaust gas flow flowing through it in flow direction 2 and is closed at the end by exhaust gas flap 3. 1 therefore shows the exhaust flap 3 in its closed position.
- the exhaust flap 3 is U-shaped in cross section (FIG. 6), the flap side walls 4 forming the U legs, which are formed by the U-cross yoke formed by the closure plate 5 are connected to one another.
- the closure plate 5 and the flap side wall 4 facing the viewer are visible in FIG. 1.
- the exhaust flap 3 can be seen pivotably mounted about the hinge joint 6.
- the hinge joint 6 is formed by a hinge pin 7, which hinge pin 7 passes through a bearing eye 8 in the region of the fixed end 9 in each flap side wall 4.
- the return spring 10 designed as a leg spring. This leg of the return spring 10 engages in a recess 11 formed in the exhaust flap 3 in the area of the closure plate 5.
- the flow body 14 designed as a wing is attached.
- the flow body 14 is arranged in the transverse direction 12 next to the closure plate 5.
- the closure plate 5 and the flow body 14 do not overlap in the transverse direction 12.
- the flow body 14 is also arranged in the region of the lower edge of the flap side walls 4, that is to say in the flow direction 2 on a different plane than the closure plate 5.
- the flow body 14 is mounted between the flap side walls 4, which for this purpose extends in the transverse direction 12 in a fork-like manner beyond the closure plate 5 are.
- the stop 15 is designed as a sheet metal flange and carries a type of
- Stop cushion effective soft wire mesh 16 prevents rattling noises of the exhaust flap 3 resting on the stop 15 in the closed state.
- the stop 15 is designed as an essentially rectangular flange in adaptation to the one shown in FIG 5 recognizable shape of the likewise rectangular-shaped closure plate 5 of the exhaust flap 3.
- FIG. 8 shows a further embodiment of the exhaust flap 3.
- the flow additive body 17 is also in the Embodiment designed as the flow body 14 as a wing.
- the wings forming the flow body 14 or the flow additional body 17 are usually inexpensive to produce as bent sheet metal parts.
- Fig. 1 the closed position of the exhaust valve 3 is shown.
- the closure plate 5 rests on the flange-shaped stop 15 at the end of the exhaust duct 1.
- FIG. 2 This open position generated by the dynamic pressure is shown in FIG. 2.
- the exhaust gas flow is conducted on the inside of both the closure plate 5 and the flap side walls 4 in the direction of the free end 13.
- the inner sides of the closure plate 5 and the flap side walls 4 have the effect of a guide vane of a turbine and bring about a targeted inflow of the flow body 14 as well as along the upper side of the flow body 14 facing the closing plate 5. Since the speed of the air flow on the upper side of the flow body 14 facing the closing plate 5 has a higher speed than on the underside, the Flow body 14 in the manner of an aerofoil of an aircraft, so that the flow generates lift.
- the exhaust flap 3 is completely opened from its approximately half-open position shown in FIG. 2, as shown in FIG. 3.
- the exhaust gas flow can flow through the exhaust duct 1 completely unhindered.
- FIG. 9 The above-described mode of operation of the exhaust flap 3 according to the invention can also be seen in FIG. 9.
- the positions of the exhaust flap 3 shown in FIGS. 1, 2 and 3 are shown schematically with some Explanations.
- the figure at the top left shows, analogously to FIG. 1, the exhaust flap 3 in the closed state. In this closed state, a small flow flows through the exhaust duct 1. This flow is represented by the arrows in the exhaust duct 1.
- the table in the lower part of FIG. 9 shows the mass flow measured in kg / h on the abscissa.
- the back pressure acting on the closure plate 5 of the exhaust flap 3 is shown in hPa.
- the thick dashed line in the graphic shows the course of the back pressure over the mass flow.
- the exhaust flap 3 With a mass flow of 100 kg / h, the counter pressure reaches a maximum at about 35 hPa, the exhaust flap 3 is opened , If the flow continues to grow, ie the mass flow increases, the state of the middle flow shown in the middle representation of the upper half of FIG. 9 is reached.
- the flow body 14 With a mass flow of 250 kg / h, the back pressure drops from the maximum to about 20 hPa (point B on the thick dashed line). With this mass flow, the opening angle of the exhaust flap 3 is approximately 15 °, which can be seen on the ordinate shown on the right in FIG. 9.
- the thin dashed line in FIG. 9 shows the opening angle of the exhaust flap 3 in relation to the mass flow.
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
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02780757A EP1397582B1 (de) | 2001-06-19 | 2002-06-01 | Abgasklappe |
DE50204096T DE50204096D1 (de) | 2001-06-19 | 2002-06-01 | Abgasklappe |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10128949A DE10128949A1 (de) | 2001-06-19 | 2001-06-19 | Abgasklappe |
DE10128949.9 | 2001-06-19 | ||
US10/046,324 US6732511B2 (en) | 2001-06-19 | 2001-10-19 | Exhaust flap |
US10/046,324 | 2001-10-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002103173A1 true WO2002103173A1 (de) | 2002-12-27 |
Family
ID=26009528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/006027 WO2002103173A1 (de) | 2001-06-19 | 2002-06-01 | Abgasklappe |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1397582B1 (de) |
DE (1) | DE50204096D1 (de) |
WO (1) | WO2002103173A1 (de) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4162740A (en) * | 1977-09-29 | 1979-07-31 | Jones Clifford W | Valve cover |
JPS57135217A (en) * | 1981-02-16 | 1982-08-20 | Iseki & Co Ltd | Cap device for muffler |
US4742766A (en) * | 1986-05-12 | 1988-05-10 | Davison Jerome G | Dynamically balanced exhaust pipe cap |
US5327933A (en) * | 1992-09-29 | 1994-07-12 | Om Industrial Co., Ltd. | Check valve of fuel tank |
US5801343A (en) * | 1993-11-09 | 1998-09-01 | Futaba Industrial Co., Ltd. | Muffler for internal combustion engine |
JPH11193710A (ja) * | 1997-12-26 | 1999-07-21 | Toyota Motor Corp | 内燃機関における消音装置 |
DE19935711C1 (de) | 1999-07-29 | 2000-12-28 | Zeuna Staerker Kg | Schalldämpfer mit variabler Dämpfungscharakteristik |
-
2002
- 2002-06-01 EP EP02780757A patent/EP1397582B1/de not_active Expired - Lifetime
- 2002-06-01 WO PCT/EP2002/006027 patent/WO2002103173A1/de not_active Application Discontinuation
- 2002-06-01 DE DE50204096T patent/DE50204096D1/de not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4162740A (en) * | 1977-09-29 | 1979-07-31 | Jones Clifford W | Valve cover |
JPS57135217A (en) * | 1981-02-16 | 1982-08-20 | Iseki & Co Ltd | Cap device for muffler |
US4742766A (en) * | 1986-05-12 | 1988-05-10 | Davison Jerome G | Dynamically balanced exhaust pipe cap |
US5327933A (en) * | 1992-09-29 | 1994-07-12 | Om Industrial Co., Ltd. | Check valve of fuel tank |
US5801343A (en) * | 1993-11-09 | 1998-09-01 | Futaba Industrial Co., Ltd. | Muffler for internal combustion engine |
JPH11193710A (ja) * | 1997-12-26 | 1999-07-21 | Toyota Motor Corp | 内燃機関における消音装置 |
DE19935711C1 (de) | 1999-07-29 | 2000-12-28 | Zeuna Staerker Kg | Schalldämpfer mit variabler Dämpfungscharakteristik |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 006, no. 236 (M - 173) 25 November 1982 (1982-11-25) * |
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29) * |
Also Published As
Publication number | Publication date |
---|---|
EP1397582B1 (de) | 2005-08-31 |
EP1397582A1 (de) | 2004-03-17 |
DE50204096D1 (de) | 2005-10-06 |
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