EP0091038A1 - Low-noise air intake arrangement of combustion engine - Google Patents
Low-noise air intake arrangement of combustion engine Download PDFInfo
- Publication number
- EP0091038A1 EP0091038A1 EP83103004A EP83103004A EP0091038A1 EP 0091038 A1 EP0091038 A1 EP 0091038A1 EP 83103004 A EP83103004 A EP 83103004A EP 83103004 A EP83103004 A EP 83103004A EP 0091038 A1 EP0091038 A1 EP 0091038A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- branch tube
- air intake
- conduit system
- elongate conduit
- air
- 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- Withdrawn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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 239000003570 air Substances 0.000 claims abstract description 83
- 238000013016 damping Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000012080 ambient air Substances 0.000 claims abstract description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000011491 glass wool Substances 0.000 abstract description 2
- 229920002635 polyurethane Polymers 0.000 abstract description 2
- 239000004814 polyurethane Substances 0.000 abstract description 2
- 230000010349 pulsation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10013—Means upstream of the air filter; Connection to the ambient air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1205—Flow throttling or guiding
- F02M35/1227—Flow throttling or guiding by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
Definitions
- the present invention relates to an air intake arrangement of an automotive combustion engine, and more particularly to an air intake arrangement of an internal combustion engine which is designed to minimize the air intake noise produced therein.
- an improved air intake arrangement of an automotive combustion engine comprising an air cleaner mounted to the combustion engine for cleaning air which is to be fed to the engine, an elongate conduit system extending from the air cleaner and terminating at its leading open end, so that upon operation of the engine, ambient air is introduced from the open end into the elongate conduit system and flows therein toward the air cleaner, a branch tube branched from the longitudinally intermediate portion of the elongate conduit system and closed at its leading end, the branch tube having a length half that of the elongate conduit system, and a viscous damping material packed in the branch tube.
- FIG. 1 there is shown an internal combustion engine 10 to which a known air cleaner 12 is mounted, the air cleaner carrying a conventional air intake duct 14.
- the air intake duct 14 is of a simply-formed tube, having one end 14a fixed to the air inlet pipe 12a of the air cleaner 12 and the other end 14b located at the front portion of the engine room.
- Designated by numerals 16 and 18 are intake and exhaust manifolds which are mounted to the engine proper 10 in a known manner.
- the fresh air taken by the air intake duct 14 flows therein and through the air cleaner inlet pipe 12a, a filter element (not shown) in the air cleaner 12, a carburetor (not shown) and the intake manifold 16 into the engine 10.
- the air intake arrangement of the above-mentioned type has suffered from the drawback of emitting unwanted amounts of air intake noise due to the inherent construction of the air intake duct 14.
- the unwanted air intake noise is caused by the resonance which tends to occur within a conduit system consisting of the air cleaner inlet pipe 12a and the air intake duct 14 at frequencies which may be identified using the equation: wherein c denotes the accoustic velocity within the conduit system, & the length of the conduit system and n a whole number integer.
- pulsation of the intake air in the air cleaner proper 12 is amplified by the resonant function possessed by the conduit system (12a + 14) and thereafter the amplified pulsation is discharged to the atmosphere from the inlet opening 14b of the air intake duct 14.
- Fig. 2 shows the characteristics of the air intake noise produced by the above-mentioned air intake arrangement, wherein peaks a 1 , a 2 , a 3 , etc. are attributable to the intake air pulsation per se, and peaks b 1 , b 2 , b 3' etc. are produced by the resonance in the conduit system (12a + 14).
- FIG. 3 there is shown an air intake system of a first embodiment of the present invention.
- identical parts to those of Fig. 1 are designated by the same numerals.
- an improved air intake duct 20 is employed in the invention in place of the afore-mentioned simply-formed air intake duct 14.
- the air intake duct 20 comprises a main tube 22 and a branch tube 24 which are integrally attached to each other.
- the main tube 22 has an end 22a fixed to the inlet pipe 12a of the air cleaner 12 and the other open end 22b located at the front portion of the engine room.
- the branch tube 24 is connected at its one open end 24a to a given portion of the main tube 24 and extends forward along the main tube and terminates at the leading end 22b of the main tube 22 (that is the air inlet opening of the duct 20).
- the terminal end 24b of the branch tube 24 is closed, as shown.
- a viscous damping material 26, such as a foamed polyurethane, a glass wool or the like is packed in the branch tube 24.
- the branch tube 24 leads from a point intermediate of the two ends of a conduit system which consists of the main tube 22 and the inlet pipe 12a of the air cleaner 12.
- the length of the branch tube 24 is essentially s of the length of the conduit system (22 + 12a).
- the branch tube 24 has the same diameter as the main tube 22.
- a secondarily occuring resonant phenomenon which might be caused by the addition of the branch tube 24 is prevented by the sound damping material 26 packed in the branch tube 24.
- the secondary resonant phenomenon would not be negligible because of the following reasons.
- the addition of the branch tube 24 increases the freedom in vibration of the conduit system (22 + 12a) causing the air in the branch the 24 to offer a dynamic damping effect, so that the reflected accoustic wave from the closed end 24b of the branch tube 24 and the progressive accoustic wave from the inlet 24a of the same fail to have a different phases of exact 90 degrees therebetween. In order to achieve the exact 90 degrees different phases between them, the.viscous damping material 26 is packed in the branch tube 24.
- FIG. 5 there is shown of a second embodiment of the present invention.
- identical parts to those of Fig. 1 are also designated by the same numerals.
- an improved air intake duct 28 is employed in this second embodiment in place of the simply-formed air intake duct 14 of Fig. 1.
- the air intake duct 28 comprises a main tube 30, a first branch tube 32 and a second branch tube 34 which are integrally attached to the main tube 30.
- the main tube 30 has an end 30a fixed to the inlet pipe 12a of the air cleaner 12 and the other open end 30b located at the front portion of the engine room.
- the first branch tube 32 is connected at its one end 32a to a given portion of the main tube 30 and extends forward along the main tube and terminates at the leading end 30b of the main tube 30 (that is the air inlet opening of the duct 28).
- the terminal end 32b of the first branch tube 32 is closed, as shown.
- the second branch tube 34 is connected at its one open end 34a to another given portion of the main tube 30 and extends forward along the same and terminates at the inlet opening 32a of the first branch tube 32.
- the terminal end of the second branch tube 34 is also closed, as shown.
- a sound damping material 26 of the afore-mentioned type is packed in the branch tubes 32 and 34. It is important in this second embodiment that the first branch tube 32 leads from a point intermediate of the two ends of a conduit system which consists of the main tube 30 and the inlet pipe 12a of the air cleaner 12, while, t the second branch tube 34 leads from a point at distance 3/4 the length of the conduit system (30 + 12a) from the inlet opening 30b of the main tube 30.
- the length of the first branch tube 32 is essentially of the length of the conduit system (30 + 12a), while, the length .of the second branch tube 34 is essentially 1 ⁇ 4 of the length of the conduit system.
- each branch tube 32 or 34 has the same diameter as the main tube 30.
- peaks b (2n-1) such as b 1 , b 39 b 57 etc. can be removed by the first branch tube 32, but also peaks b (4n-2) , such as b 2 , b 6 , b 10 , etc. can be removed by the second branch tube 34, by substantially the same reason as is mentioned in the first embodiment.
- peaks b (4n-2) such as b 2 , b 6 , b 10 , etc.
- the second branch tube 34 may be connected to a point at distance 1 ⁇ 4 the length of the conduit system (30 + 12a) from the inlet opening 30b of the main tube 30, as is indicated by a broken line. In this case, substantially the same advantageous phenomenon as that mentioned hereinabove is expected.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Pipe Accessories (AREA)
Abstract
An air intake duct (22,30) and an air inlet pipe (12a) of an air cleaner (12) are combined to form an elongate conduit system through which ambient air to be fed to the combustion engine flows. A branch tube (24, 32) having a length half that of the elongeate conduit system is branched from the longitudinally intermediate portion of the system and closed at its leading end (24b, 32b). A viscous damping material (26), such as, a foamed polyurethane, a glass wool or the like is packed in the branch tube.
Description
- The present invention relates to an air intake arrangement of an automotive combustion engine, and more particularly to an air intake arrangement of an internal combustion engine which is designed to minimize the air intake noise produced therein.
- In order to feed the engine with ambient or fresh air, it become usual to fit the inlet pipe of the engine- mounted air cleaner with an elongate air intake duct which leads to a well-ventilated portion of the engine room. However, the provision of the elongate air intake duct tends to cause a noise trouble in air intake due to the resonance which occurs in the duct. This trouble will be outlined hereinafter.
- It is therefore an essential object of the present invention to provide an improved air intake arrangement which can minimize the air intake noise produced therein.
- According to the present invention, there is provided an improved air intake arrangement of an automotive combustion engine. The arrangement comprises an air cleaner mounted to the combustion engine for cleaning air which is to be fed to the engine, an elongate conduit system extending from the air cleaner and terminating at its leading open end, so that upon operation of the engine, ambient air is introduced from the open end into the elongate conduit system and flows therein toward the air cleaner, a branch tube branched from the longitudinally intermediate portion of the elongate conduit system and closed at its leading end, the branch tube having a length half that of the elongate conduit system, and a viscous damping material packed in the branch tube.
- Other objects and advantages of the present invention will become clear from the following description when taken in conjunction with the accompanying drawings, in which:
- Fig. 1 is a plan view of an engine room of a motor vehicle, showing a conventional air intake arrangement mounted to an internal combustion engine;
- Fig. 2 is a graph showing the characteristics of the air intake noise produced by the conventional air intake arrangement of Fig. 1;
- Fig. 3 is a view similar to Fig. 1, but showing an improved air intake arrangement of a first embodiment of the present invention;
- Fig. 4 is a graph showing the characteristics of the air intake noise produced by the air intake arrangement of the first embodiment;
- Fig. 5 is a view similar to Fig. 1, but showing an improved air intake arrangement of a second embodiment of the present invention; and
- Fig. 6 is a graph showing the characteristics of the air intake noise produced by the air intake arrangement of the second embodiment.
- Prior to describing the invention, one of the conventional air intake arrangements of an internal combustion engine will be outlined with reference to Figs. 1 and 2 in order to clarify the invention.
- Referring to Fig. 1, there is shown an
internal combustion engine 10 to which a knownair cleaner 12 is mounted, the air cleaner carrying a conventionalair intake duct 14. As shown, theair intake duct 14 is of a simply-formed tube, having one end 14a fixed to theair inlet pipe 12a of theair cleaner 12 and theother end 14b located at the front portion of the engine room. Designated bynumerals - Thus, in operation of the
engine 10, the fresh air taken by theair intake duct 14 flows therein and through the aircleaner inlet pipe 12a, a filter element (not shown) in theair cleaner 12, a carburetor (not shown) and theintake manifold 16 into theengine 10. - However, the air intake arrangement of the above-mentioned type has suffered from the drawback of emitting unwanted amounts of air intake noise due to the inherent construction of the
air intake duct 14. Experiment has revealed that the unwanted air intake noise is caused by the resonance which tends to occur within a conduit system consisting of the aircleaner inlet pipe 12a and theair intake duct 14 at frequencies which may be identified using the equation:air intake duct 14. Fig. 2 shows the characteristics of the air intake noise produced by the above-mentioned air intake arrangement, wherein peaks a1, a2, a3, etc. are attributable to the intake air pulsation per se, and peaks b1, b2, b3' etc. are produced by the resonance in the conduit system (12a + 14). - Therefore, it is an essential object of the present invention to provide an improved air intake system which can minimize the unwanted air intake noise.
- Referring to Fig. 3, there is shown an air intake system of a first embodiment of the present invention. In the drawing, identical parts to those of Fig. 1 are designated by the same numerals. As will be understood from this drawing, an improved
air intake duct 20 is employed in the invention in place of the afore-mentioned simply-formedair intake duct 14. - The
air intake duct 20 comprises amain tube 22 and abranch tube 24 which are integrally attached to each other. Themain tube 22 has anend 22a fixed to theinlet pipe 12a of theair cleaner 12 and the otheropen end 22b located at the front portion of the engine room. Thebranch tube 24 is connected at its one open end 24a to a given portion of themain tube 24 and extends forward along the main tube and terminates at the leadingend 22b of the main tube 22 (that is the air inlet opening of the duct 20). Theterminal end 24b of thebranch tube 24 is closed, as shown. Aviscous damping material 26, such as a foamed polyurethane, a glass wool or the like is packed in thebranch tube 24. It is important in this embodiment that thebranch tube 24 leads from a point intermediate of the two ends of a conduit system which consists of themain tube 22 and theinlet pipe 12a of theair cleaner 12. Thus, the length of thebranch tube 24 is essentially s of the length of the conduit system (22 + 12a). Preferably, thebranch tube 24 has the same diameter as themain tube 22. - In accordance with the above-stated arrangement of the first embodiment, it is expected that, in the
branch tube 24, the progressive accoustic wave from the inlet 24a of thebranch tube 24 and the reflected accoustic wave from the closedend 24b of thebranch tube 24 interfere and thus cancel or at least weaken each other. Thus, peaks b(2n-1), such as b 1, b 3, b5, etc. which are produced by the resonance in the conduit system (22 + 12a) can be removed from the air intake noise thereby reducing the accoustic energy of the noise. This advantageous phenomenon will be readily understood from Fig. 4. - It is to be noted that a secondarily occuring resonant phenomenon which might be caused by the addition of the
branch tube 24 is prevented by thesound damping material 26 packed in thebranch tube 24. In fact, if thesound damping material 26 is not provided in thetube 24, the secondary resonant phenomenon would not be negligible because of the following reasons. The addition of thebranch tube 24 increases the freedom in vibration of the conduit system (22 + 12a) causing the air in the branch the 24 to offer a dynamic damping effect, so that the reflected accoustic wave from the closedend 24b of thebranch tube 24 and the progressive accoustic wave from the inlet 24a of the same fail to have a different phases of exact 90 degrees therebetween. In order to achieve the exact 90 degrees different phases between them, the.viscous damping material 26 is packed in thebranch tube 24. - Referring to Fig. 5, there is shown of a second embodiment of the present invention. In this drawing, identical parts to those of Fig. 1 are also designated by the same numerals. Similar to the first embodiment, an improved
air intake duct 28 is employed in this second embodiment in place of the simply-formedair intake duct 14 of Fig. 1. - The
air intake duct 28 comprises a main tube 30, afirst branch tube 32 and asecond branch tube 34 which are integrally attached to the main tube 30. The main tube 30 has anend 30a fixed to theinlet pipe 12a of theair cleaner 12 and the otheropen end 30b located at the front portion of the engine room. Similar to the first embodiment, thefirst branch tube 32 is connected at its oneend 32a to a given portion of the main tube 30 and extends forward along the main tube and terminates at the leadingend 30b of the main tube 30 (that is the air inlet opening of the duct 28). Theterminal end 32b of thefirst branch tube 32 is closed, as shown. Thesecond branch tube 34 is connected at its one open end 34a to another given portion of the main tube 30 and extends forward along the same and terminates at the inlet opening 32a of thefirst branch tube 32. The terminal end of thesecond branch tube 34 is also closed, as shown. Asound damping material 26 of the afore-mentioned type is packed in thebranch tubes first branch tube 32 leads from a point intermediate of the two ends of a conduit system which consists of the main tube 30 and theinlet pipe 12a of theair cleaner 12, while, t thesecond branch tube 34 leads from a point at distance 3/4 the length of the conduit system (30 + 12a) from the inlet opening 30b of the main tube 30. Thus, the length of thefirst branch tube 32 is essentially of the length of the conduit system (30 + 12a), while, the length .of thesecond branch tube 34 is essentially ¼ of the length of the conduit system. Preferably, eachbranch tube - In this second embodiment, not only peaks b(2n-1), such as b1, b39 b57 etc. can be removed by the
first branch tube 32, but also peaks b(4n-2), such as b 2, b6, b10, etc. can be removed by thesecond branch tube 34, by substantially the same reason as is mentioned in the first embodiment. Thus, in this second embodiment, much more effective sound damping effect is expected. This advantageous phenomenon will be well understood from the graph of Fig. 6. - If desired, the
second branch tube 34 may be connected to a point at distance ¼ the length of the conduit system (30 + 12a) from the inlet opening 30b of the main tube 30, as is indicated by a broken line. In this case, substantially the same advantageous phenomenon as that mentioned hereinabove is expected.
Claims (8)
1. An air intake arrangement of an automotive combustion engine (10), comprising:
an air cleaner (12) mounted to said combustion engine for cleaning air which is to be fed to said engine;
an elongate conduit system (22 + 12a), (30 + 12a) extending from said air cleaner and terminating at its leading open end (22b, 30b), so that upon operation of the engine, ambient air is introduced from said open end into said elongate conduit system and flows therethrough toward said air cleaner;
a branch tube (24, 32) branched from the longitudinally intermediate portion of said elongate conduit system and closed at its leading end (24b, 32b), said branch tube having a length half that of said elongate conduit system; and
a viscous damping material (26) packed in said branch tube. (Figs. 3, 5)
2. An air intake arrangement as claimed in Claim 1, in which said branch tube extends along said elongate conduit system toward the open end of the system. (Figs. 3, 5)
3. An air intake arrangement as claimed in Claim 1, in which said branch tube has the same diameter as said elongate conduit system. (Figs. 3, 5)
4. An air intake arrangement as claimed in Claim 1, in which said elongate conduit system comprises an inlet pipe (12a) of said air cleaner and a separate air intake duct (22, 30) which is held by said air inlet pipe of the air cleaner. (Figs. 3, 5)
5. An air intake arrangement as claimed in Claim 1, further comprising another branch tube (34) branched from a portion of the elongate conduit system at a distance 3/4 the length of said elongate conduit system from said leading open end of said system and closed at its leading end, said another branch tube having a length ¼ that of said elongate conduit system, said another branch tube being packed with a viscous damping material. (Fig. 5)
6. An air intake arrangement as claimed in Claim 5, in which said another branch tube extends along said elongate conduit system toward the branched portion of said branch tube. (Fig. 5)
7. An air intake arrangement as claimed in Claim 6, in which said elongate system, said branch tube and said another branch tube are integrated with each other. (Fig. 5)
8. An air intake arrangement as claimed in Claim 1, further comprising another branch tube (34) branched from a portion of said elongate conduit system at a distance ¼ the length of said elongate conduit system from the open leading end of said system and closed at its leading end, said another branch tube having a length i that of said elongate conduit system, said another branch the being packed with a viscous damping material. (Fig. 5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5557482A JPS58172451A (en) | 1982-04-02 | 1982-04-02 | Intake air system in automobile engine |
JP55574/82 | 1982-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0091038A1 true EP0091038A1 (en) | 1983-10-12 |
Family
ID=13002493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83103004A Withdrawn EP0091038A1 (en) | 1982-04-02 | 1983-03-25 | Low-noise air intake arrangement of combustion engine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0091038A1 (en) |
JP (1) | JPS58172451A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0192457A1 (en) * | 1985-02-18 | 1986-08-27 | Honda Giken Kogyo Kabushiki Kaisha | Silencer |
EP0365892A1 (en) * | 1988-10-24 | 1990-05-02 | Iveco Magirus Aktiengesellschaft | Air intake device for an internal-combustion engine |
US5014816A (en) * | 1989-11-09 | 1991-05-14 | E. I. Du Pont De Nemours And Company | Silencer for gas induction and exhaust systems |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3034258B2 (en) * | 1989-01-24 | 2000-04-17 | マツダ株式会社 | Engine intake silencer |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2297046A (en) * | 1939-08-25 | 1942-09-29 | Maxim Silencer Co | Means for preventing shock excitation of acoustic conduits or chambers |
US2468454A (en) * | 1944-05-10 | 1949-04-26 | Bell Telephone Labor Inc | Acoustic wave filter with resistive termination, including side branch chamber |
DE891343C (en) * | 1950-12-01 | 1953-09-28 | Karl Dr-Ing Habil Goesele | Arrangement for the suppression of passage resonances in pipe sections |
FR1217190A (en) * | 1958-12-03 | 1960-05-02 | Silent suction device for compressors and similar motors | |
FR2163938A5 (en) * | 1971-12-07 | 1973-07-27 | Lautrette Jean |
-
1982
- 1982-04-02 JP JP5557482A patent/JPS58172451A/en active Pending
-
1983
- 1983-03-25 EP EP83103004A patent/EP0091038A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2297046A (en) * | 1939-08-25 | 1942-09-29 | Maxim Silencer Co | Means for preventing shock excitation of acoustic conduits or chambers |
US2468454A (en) * | 1944-05-10 | 1949-04-26 | Bell Telephone Labor Inc | Acoustic wave filter with resistive termination, including side branch chamber |
DE891343C (en) * | 1950-12-01 | 1953-09-28 | Karl Dr-Ing Habil Goesele | Arrangement for the suppression of passage resonances in pipe sections |
FR1217190A (en) * | 1958-12-03 | 1960-05-02 | Silent suction device for compressors and similar motors | |
FR2163938A5 (en) * | 1971-12-07 | 1973-07-27 | Lautrette Jean |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0192457A1 (en) * | 1985-02-18 | 1986-08-27 | Honda Giken Kogyo Kabushiki Kaisha | Silencer |
US4800985A (en) * | 1985-02-18 | 1989-01-31 | Honda Giken Kogyo Kabushiki Kaisha | Silencer with a side branch |
AU597878B2 (en) * | 1985-02-18 | 1990-06-14 | Honda Giken Kogyo Kabushiki Kaisha | Silencer with a side branch |
EP0365892A1 (en) * | 1988-10-24 | 1990-05-02 | Iveco Magirus Aktiengesellschaft | Air intake device for an internal-combustion engine |
US5014816A (en) * | 1989-11-09 | 1991-05-14 | E. I. Du Pont De Nemours And Company | Silencer for gas induction and exhaust systems |
WO1992014922A1 (en) * | 1989-11-09 | 1992-09-03 | E.I. Du Pont De Nemours And Company | Silencer for gas induction and exhaust systems |
Also Published As
Publication number | Publication date |
---|---|
JPS58172451A (en) | 1983-10-11 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19830325 |
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AK | Designated contracting states |
Designated state(s): DE FR GB |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NISSAN MOTOR CO., LTD. |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19850423 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: INABA, MOTOHIRO Inventor name: OMURA, HIDEO Inventor name: TAKEI, HIROFUMI |