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GB2111122A - Silencer arrangement at the inlet of an I.C. engine air cleaner - Google Patents

Silencer arrangement at the inlet of an I.C. engine air cleaner Download PDF

Info

Publication number
GB2111122A
GB2111122A GB08226364A GB8226364A GB2111122A GB 2111122 A GB2111122 A GB 2111122A GB 08226364 A GB08226364 A GB 08226364A GB 8226364 A GB8226364 A GB 8226364A GB 2111122 A GB2111122 A GB 2111122A
Authority
GB
United Kingdom
Prior art keywords
air intake
intake tube
air
holes
resonance chamber
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
Application number
GB08226364A
Other versions
GB2111122B (en
Inventor
Rudolf Natanovich Starobinsky
Mikhail Ilich Fesina
Jury Petrovich Lazarev
Evgeny Vasilievich Lysenko
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.)
VOLZH OB PROIZV
VOLZHSKOE OBIEDINENIE PO PROIZVODSTVU LEGKOVYKH AVTOMOBILEI
Original Assignee
VOLZH OB PROIZV
VOLZHSKOE OBIEDINENIE PO PROIZVODSTVU LEGKOVYKH AVTOMOBILEI
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 VOLZH OB PROIZV, VOLZHSKOE OBIEDINENIE PO PROIZVODSTVU LEGKOVYKH AVTOMOBILEI filed Critical VOLZH OB PROIZV
Publication of GB2111122A publication Critical patent/GB2111122A/en
Application granted granted Critical
Publication of GB2111122B publication Critical patent/GB2111122B/en
Expired legal-status Critical Current

Links

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
    • F02M35/14—Combined air cleaners and silencers
    • 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
    • F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
    • 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
    • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Filtering Materials (AREA)

Abstract

An air cleaner intake tube 6 which diverges in the direction from its open end is provided with radial holes 9 and 10 and a resonance chamber 11. The radial holes 9 and 10 are arranged in two rows 7 and 8 one of which is spaced a distance (0.1-0.2)L from the open end of the air intake tube 6, the other being disposed at a distance of (0.4-0.6)L from the open end thereof. The flow area of the holes 9 and 10 of each of the rows 7 and 8 amounts to (0.02-0.1)S, while the volume of the resonance chamber 11 is (O.25-0.7)V, where L is the length of the air intake tube 6; S is the cross-sectional area of the air intake tube 6 at locations of the radial holes 9 and 10; and V is the volume of the air intake tube 6. <IMAGE>

Description

SPECIFICATION Air cleaner of an internal combustion engine This invention relates generally to engine construction, and more specifically to air cleaners of internal combustion engines.
The invention can find application predominantly in air inlet air cleaner constructions of motor vehicle internal combustion engines, particularly automobile, marine, locomotive engines and the like, as well as in stationary engines, such as those used for driving generators, compressors, etc., when it is necessary to reduce the noise level emitted by air intake systems.
It is therefore an object of the present invention to reduce the amount of air intake noise.
The object is attained by that in an air cleaner of an internal combustion engine comprising a housing having secured thereto an air intake tube diverging in the direction from an open end thereof, the air intake tube being provided with radial holes and a resonance chamber adapted to embrace the air intake tube, according to the invention, the holes are arranged in two rows, one of the rows being spaced from the open end of the air intake tube a distance (0.1-0.2)L, the other one being disposed at a distance of (0.4-0.6)L from the open end thereof, the flow areas of the holes of each of the rows amounting to (0.02-0. 1)S, the volume of the resonance chamber being (0.25-0.7)V, where L is the length of the air intake tube; S is the cross-sectional area of the air intake tube at locations of the radial holes; and V is the volume of the air intake tube.
This relationship between the geometry of the radial holes, the resonator and the air intake tube provides for efficient suppression of resonances of the air column in the air intake tube which entails reduced air intake noise.
The invention will now be described in greater detail with reference to preferred embodiments thereof and taking into account the accompanying drawings, in which: Figure 1 is an air cleaner of an internal combustion engine according to the invention; Figure 2 shows curves illustrating distribution of the lowest forms of natural oscillations of the air volume in an air intake tube of the air cleaner according to the invention; and Figure 3 represents a noise spectrogram iliustrating the advantageous effect attained by the present invention.
With reference to Fig. 1, an air cleaner of an internal combustion engine comprises a housing 1 having a filter cover 2 and a filter element 3. The housing 1 is provided with an inlet port 4 and an outlet port 5. The inlet port 4 accommodates an air intake tube 6 having two rows 7 and 8 (Fig. 2) of calibrated holes 9 and 10 (Figs. 1 and 2). A casing is attached to the air intake tube 6, the interior of the casing defining a resonance chamber 11.
The air cleaner of an internal combustion engine operates in the following manner.
With the engine running, and particularly when the engine inlet valves are open, ambient air is sucked into the housing 1 through the air intake tube 6 to be conveyed further via a system of conduits into the engine cylinders. Therewith, the variable component of the volumetric flow of the air being sucked in determined by variations in the engine cylinder displacements at the intake valves in the open position is weakened in the housing 1 of the air cleaner to be emitted through the open end of the air intake tube 6 (Fig. 2) as noise into the atmosphere. At frequencies determined by the equation: c fk = k 21 where fk is the frequency of oscillations; c is the velocity of sound; I is the length of the air intake tube; and k is 1, 2, 3.. (series of the natural numbers), resonance oscillations occur (at the natural frequencies of the air intake tube open on both sides) enhancing the noise radiation produced by the open end of the air intake tube 6. In order to suppress these, the resonance chamber 11 defined by the casing firmly embracing the outer side of the air intake tube 6 and the outer surface thereof is provided in parallel with the air intake tube 6 by means of holes 9 and 10 grouped in two sections of the air intake tube 6. During steady-state resonance oscillations at the frequency fk standing waves with clear-cut pressure antinodes and nodes lengthwise of the air intake tube 6 are formed. The lowest frequency oscillations (Fig.2; first k = 1, second k = 2, and third k = 3) are most intensive and have a maximum sound pressure amplitude.The holes 9 and 10 are located lengthwise of the air intake tube 6 such as to ensure that air is forced through into the resonance chamber 11 wherein the sound energy is dissipated to be transformed into a heat energy. Therefore, the resonance chamber 11 acts as if to smooth the resonance oscillations at frequencies fk thereby reducing their amplitude.
The range of flow area of the holes 9 and 10 of each of the rows 7 and 8 thereof (0.02-0. 1)S (S being the cross-sectional area of the air intake tube 6 at locations where the holes 9 and 10 are disposed) covers the frequency area of the sound spectrum of the resonance radiation at the lowest natural reso nance forms of air volumes in air intake tubes 6 of air cleaners used in modern motor vehicles, which frequency area can be effectively suppressed by means of the herein proposed air cleaner. Where the area (F) of the holes is less than 0.02S, the damping is weak failing to effectively force the air through from the air intake tube 6 into the resonance chamber 11.Conversely, if the area of the holes is in excess of 0. 1 S, then at one and the same amount (0) of the air being forced through, determined by the volume of the resonance chamber 11 and the amplitude of pressure oscillations, the velocity (V) of the gas being forced through becomes small, while energy dissipation is reduced in proportion to the square of the velocity, because 0 V=, F where F is the flow area of the holes.
In order to suppress the initial low frequency oscillations, the volume of the resonance chamber 11 must be 0.25-0.7 the volume of the air intake tube 6. When the relationship between the volumes V is less than 0.25, the volume of air contained in the resonance chamber 11 is negligeable and insufficient for efficient operation of the resonator 8. At values thereof in excess of 0.7 and at present optimum relationships of the areas of the holes 9 and 10, a deciding factor affecting the efficiency of noise reduction is resistance to the flow in the calibrated holes 9 and 10. Also, at values more than 0.7 dimensions of the resonance chamber 11 and the amount of metal consumed for the manufacture thereof increases while the strength of connection between the air intake tube 6 and the housing 1 is reduced.
Improved reliability of noise suppression by the resonance chamber 11 as compared with the known devices is ensured by that regardless of whether the antinode of oscillations (the air is forced through efficiently) or the node of oscillations (the air is forced through inefficiently) are in the zone of the calibrated holes 9 and 10, noise is effectively forced through into the interior of the resonance chamber 11. This is ensured by that the air intake tube 6 has a conical configuration, while the calibrated holes 9 and 10 are grouped into two rows 7 and 8 spaced from the open end of the tube 6 distances (0.1-0.2)L and (0.4-0.6)L, respectively.In this case if, for example, in the region of one of the rows 7 or 8 of the calibrated holes 9 or 10 a pressure node but not a pressure antinode is formed (pressure and rate of oscillations are phase offset by 7T/2), then due to a substantial difference in the amplitude values of pressure at various sections of the tube 6, air is caused to be forced through into the resonance chamber 11 accompanied by circulation of air flows from the air intake tube 6 into the resonance chamber 11 and from the resonance chamber 11 into the air intake tube 6 via the holes 9 and 10 in the rows 7 and 8; in other words, even in the case just mentioned the resonance chamber 11 operates and provides reliable noise suppression (see curves in the k = 2 mode for the pressure P and the velocity V).At the same time, according to analysis of pressure curves at the lowest natural resonance forms of oscillations of the air volume in the air intake tube of the known air cleaner, connecting holes between the tube and the interior of the resonance chamber are disposed in proximity to pressure nodes (zero pressure zones), which reduces the efficiency of forcing these resonance pressures into the interior of the chamber.
The efficiency of suppressing the noise produced by the air intake tube by means of the herein proposed device is illustrated in Fig. 3.
The solid line (a) shows the spectrum of noise emitted through the air intake tube 6 in a prior art air cleaner of an internal combustion engine, while the broken line (b) shows the same for the proposed air cleaner of an internal combustion engine.
As is seen from the accompanying noise spectrogram, during operation of the engine provided with an air intake temperature control means at a full engine torque rpm the use of this invention allows to effectively suppress air intake noise in the frequency range of between 31 5 and 500 Hz to 9 dB (graph b).
The range of from 31 5 to 500 Hz characterizes the resonance radiation at the lowest natural forms of air volume oscillations in the air intake tube of the air cleaner.
The object of the present invention is attained as described heretofore.

Claims (2)

1. An air cleaner of an internal combustion engine comprising a housing having secured thereto an air intake tube diverging in the direction from an open end thereof and provided with radial holes and a resonance chamber adapted to embrace the air intake tube; the radial holes are arranged on the air intake tube in two rows one of which is spaced a distance (0.1 -0.2)L from the open end of the air intake tube, the other being disposed at a distance of (0.4-0.6)L from the open end of the air intake tube; the flow area of each of the rows of holes amounts to (0.02-0. 1)S, the volume of the resonance chamber being (0.25-0.7)V, where L is the length of the air intake tube, S is the cross-sectional area of the air intake tube at locations of the radial holes, and V is the volume of the air intake tube.
2. An air cleaner of an internal combustion engine substantially as heretofore described with reference to the accompanying drawings.
GB08226364A 1981-12-08 1982-09-16 Silencer arrangement at the inlet of an i.c. engine air cleaner Expired GB2111122B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU3357251 1981-12-08

Publications (2)

Publication Number Publication Date
GB2111122A true GB2111122A (en) 1983-06-29
GB2111122B GB2111122B (en) 1985-03-27

Family

ID=20983649

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08226364A Expired GB2111122B (en) 1981-12-08 1982-09-16 Silencer arrangement at the inlet of an i.c. engine air cleaner

Country Status (6)

Country Link
JP (1) JPS58117350A (en)
DE (1) DE3234634A1 (en)
FR (1) FR2517749A1 (en)
GB (1) GB2111122B (en)
IT (1) IT1152880B (en)
SE (1) SE8206416L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2549901A1 (en) * 1983-07-27 1985-02-01 Volzh Ob Proizv Air filter for internal combustion engine
US6983820B2 (en) 2001-09-07 2006-01-10 Avon Polymer Products Limited Noise and vibration suppressors
WO2006118443A1 (en) * 2005-04-29 2006-11-09 Universiteit Twente Broadband sound reduction with acoustic resonator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4855301A (en) * 1986-10-09 1989-08-08 E. R. Squibb & Sons, Inc. 1,2,3,4-Tetrahydro-6-substituted-4-aryl(or heterocyclo)-3-((substituted amino)carbonyl)-2-thioxo (or oxo)-5-pyrimidinecarboxylic acids and esters
DE4437916A1 (en) * 1994-10-22 1996-04-25 Knecht Filterwerke Gmbh Filter housing for IC engine inlet air filter
DE19504223A1 (en) * 1995-02-09 1996-08-14 Volkswagen Ag Intake silencer for internal combustion engine
DE19615917A1 (en) * 1996-04-22 1997-10-30 Wolf Woco & Co Franz J Intake silencer and motor vehicle
DE19902951A1 (en) * 1999-01-26 2000-07-27 Mann & Hummel Filter Induction device for internal combustion engine, in which resonance tube has common wall sector with line sector
KR100957142B1 (en) * 2007-07-30 2010-05-11 현대자동차주식회사 Energy cleaner intake duct

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE580923C (en) * 1930-11-05 1933-07-19 Gabriel Becker Muffler for internal combustion engines through acoustic filters
FR716823A (en) * 1931-04-10 1931-12-28 Auto Product G M B H Silencer for the suction of combustion engines, compressors, air pumps, and other similar devices
DE1665411U (en) * 1951-10-08 1953-10-22 Eberspaecher J SILENCER DEVICE FOR TWO-STROKE SINGLE CYLINDER COMBUSTION ENGINES OR CORRESPONDING PULSING SOUND SOURCES.
GB780235A (en) * 1955-02-21 1957-07-31 Gen Motors Ltd Improvements in silencers for the air intakes of carburetters for internal combustion engines
FR1356989A (en) * 1963-04-05 1964-04-03 Citroen Sa Andre Air filter simultaneously constituting a resonator silencer for the air drawn into combustion engines
GB1011190A (en) * 1963-11-07 1965-11-24 Brown Tractors Ltd An improved silencer for an internal combustion engine
AT245869B (en) * 1964-03-14 1966-03-25 Knecht Filterwerke Gmbh Damper filter for the intake air of internal combustion engines, in particular of rotary piston engines
FR2163938A5 (en) * 1971-12-07 1973-07-27 Lautrette Jean
BE793746A (en) * 1972-01-11 1973-07-09 Sercel Rech Const Elect ANALOGUE SIGNAL SAMPLE AMPLIFIER WITH AUTOMATIC GAIN ADJUSTMENT
GB2070682B (en) * 1980-02-09 1983-09-28 Engineering Components Ltd Silencer for the inlet to an air cleaner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2549901A1 (en) * 1983-07-27 1985-02-01 Volzh Ob Proizv Air filter for internal combustion engine
US6983820B2 (en) 2001-09-07 2006-01-10 Avon Polymer Products Limited Noise and vibration suppressors
WO2006118443A1 (en) * 2005-04-29 2006-11-09 Universiteit Twente Broadband sound reduction with acoustic resonator

Also Published As

Publication number Publication date
SE8206416L (en) 1983-06-09
FR2517749A1 (en) 1983-06-10
IT8223654A1 (en) 1984-04-07
DE3234634A1 (en) 1983-06-23
SE8206416D0 (en) 1982-11-11
IT8223654A0 (en) 1982-10-07
JPS58117350A (en) 1983-07-12
GB2111122B (en) 1985-03-27
IT1152880B (en) 1987-01-14
DE3234634C2 (en) 1988-02-04
FR2517749B1 (en) 1984-04-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee