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EP0091038A1 - Dispositif silencieux d'aspiration d'air pour moteur à combustion interne - Google Patents

Dispositif silencieux d'aspiration d'air pour moteur à combustion interne Download PDF

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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Withdrawn
Application number
EP83103004A
Other languages
German (de)
English (en)
Inventor
Hirofumi Takei
Motohiro Inaba
Hideo Omura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0091038A1 publication Critical patent/EP0091038A1/fr
Withdrawn legal-status Critical Current

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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)
EP83103004A 1982-04-02 1983-03-25 Dispositif silencieux d'aspiration d'air pour moteur à combustion interne Withdrawn EP0091038A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5557482A JPS58172451A (ja) 1982-04-02 1982-04-02 自動車用エンジンの吸気装置
JP55574/82 1982-04-02

Publications (1)

Publication Number Publication Date
EP0091038A1 true EP0091038A1 (fr) 1983-10-12

Family

ID=13002493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103004A Withdrawn EP0091038A1 (fr) 1982-04-02 1983-03-25 Dispositif silencieux d'aspiration d'air pour moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0091038A1 (fr)
JP (1) JPS58172451A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192457A1 (fr) * 1985-02-18 1986-08-27 Honda Giken Kogyo Kabushiki Kaisha Silencieux
EP0365892A1 (fr) * 1988-10-24 1990-05-02 Iveco Magirus Aktiengesellschaft Dispositif d'aspiration d'air pour un moteur à combustion interne
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3034258B2 (ja) * 1989-01-24 2000-04-17 マツダ株式会社 エンジンの吸気消音装置

Citations (5)

* Cited by examiner, † Cited by third party
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 (de) * 1950-12-01 1953-09-28 Karl Dr-Ing Habil Goesele Anordnung zur Unterdrueckung von Durchlass-Resonanzen bei Rohrstuecken
FR1217190A (fr) * 1958-12-03 1960-05-02 Dispositif silencieux d'aspiration pour compresseurs et moteurs analogues
FR2163938A5 (fr) * 1971-12-07 1973-07-27 Lautrette Jean

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 (de) * 1950-12-01 1953-09-28 Karl Dr-Ing Habil Goesele Anordnung zur Unterdrueckung von Durchlass-Resonanzen bei Rohrstuecken
FR1217190A (fr) * 1958-12-03 1960-05-02 Dispositif silencieux d'aspiration pour compresseurs et moteurs analogues
FR2163938A5 (fr) * 1971-12-07 1973-07-27 Lautrette Jean

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192457A1 (fr) * 1985-02-18 1986-08-27 Honda Giken Kogyo Kabushiki Kaisha Silencieux
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 (fr) * 1988-10-24 1990-05-02 Iveco Magirus Aktiengesellschaft Dispositif d'aspiration d'air pour un moteur à combustion interne
US5014816A (en) * 1989-11-09 1991-05-14 E. I. Du Pont De Nemours And Company Silencer for gas induction and exhaust systems
WO1992014922A1 (fr) * 1989-11-09 1992-09-03 E.I. Du Pont De Nemours And Company Silencieux destine a des systemes d'admission et d'echappement pour le gaz

Also Published As

Publication number Publication date
JPS58172451A (ja) 1983-10-11

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Date Code Title Description
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

17P Request for examination filed

Effective date: 19830325

AK Designated contracting states

Designated state(s): DE FR GB

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NISSAN MOTOR CO., LTD.

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

18D Application deemed to be withdrawn

Effective date: 19850423

RIN1 Information on inventor provided before grant (corrected)

Inventor name: INABA, MOTOHIRO

Inventor name: OMURA, HIDEO

Inventor name: TAKEI, HIROFUMI