GB2127094A - I.C. Engine intake air cleaner and silencer - Google Patents

I.C. Engine intake air cleaner and silencer Download PDF

Info

Publication number
GB2127094A
GB2127094A GB8225942A GB8225942A GB2127094A GB 2127094 A GB2127094 A GB 2127094A GB 8225942 A GB8225942 A GB 8225942A GB 8225942 A GB8225942 A GB 8225942A GB 2127094 A GB2127094 A GB 2127094A
Authority
GB
United Kingdom
Prior art keywords
intake duct
air intake
air cleaner
holes
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.)
Granted
Application number
GB8225942A
Other versions
GB2127094B (en
Inventor
Rudolf Natanovich Starobinsky
Mikhail Ilich Fesina
Jury Petrovich Lazarev
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
Priority to SE8205103A priority Critical patent/SE445573B/en
Application filed by VOLZH OB PROIZV, VOLZHSKOE OBIEDINENIE PO PROIZVODSTVU LEGKOVYKH AVTOMOBILEI filed Critical VOLZH OB PROIZV
Priority to GB8225942A priority patent/GB2127094B/en
Priority to DE19823234633 priority patent/DE3234633A1/en
Priority to FR8215798A priority patent/FR2533265A1/en
Publication of GB2127094A publication Critical patent/GB2127094A/en
Application granted granted Critical
Publication of GB2127094B publication Critical patent/GB2127094B/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
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1238—Flow throttling or guiding by using secondary connections to the ambient, e.g. covered by a membrane or a porous member

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The air cleaner intake duct 2 is provided with two regions 6 and 7 of holes 4 and 5 spaced from the open end of the duct at distances between 0.14 and 0.26 and 0.34 and 0.42 of the total length of the air intake duct 2, respectively. Each of the regions 6 and 7 comprises at least two holes 4 and 5. The total flow area of the holes 4 or 5 is between 0.02 and 0.04 times the mean duct cross-sectional area. The duct (2', Fig. 5) may be curved to follow the cleaner housing 1. <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 in air inlet air cleaner constructions of motor vehicle engines, particularly automobile, marine an locomotive engines and the like, as well as 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 an object of the invention to reduce the level of air intake noise.
Another object is to strengthen the connection of an air intake duct to the housing of an air cleaner and reduce the overall dimensions of the air cleaner air intake duct assembly.
The objects are attained by that in an air cleaner of an internal combustion engine comprising a housing having an air intake duct wherein there are provided holes disposed radially relative to the geometrial axis of the air intake duct, according to the invention, the holes of the air intake duct define two rows or belts of such holes spaced from an inlet end of the air intake duct at a distance of 0.14 - 0.26 and 0.34 0.42 the total length of the air intake duct, respectively.
Advisably, each of the rows or belts of holes comprises at least two such holes, the total flow area of the holes in each of the rows or belts amounting to between 0.02 and 0.04 the mean cross-sectional area of the air intake duct.
The above construction of the air cleaner allows to effectively, reliably and easily reduce the level of air intake noise.
Preferably, the air intake duct is bent or curved with the geometrical axis thereof adapted to partially conform to the outside contour of the air cleaner.
Such a feature affords to improve the reliability of fixing the air intake duct to the housing of the air cleaner.
The invention will now be described in greater detail with reference to specific embodiments thereof taken in conjunction with the accompanying drawings, in which: Figure 1 illustrates a section of the housing of an air cleaner according to the invention and an air intake duct provided with two rows of holes; Figure 2 is a section taken along the line ll-ll in Figure 1; Figure 3 shows curves illustrating the distribution of the lowerst forms of pressure oscillations in the air intake duct of the air cleaner according to the invention; Figure 4 illustrates 1/3 octave band of the level of noise produced by the air cleaner embodying the present invention and by a prior art cleaner representing the beneficial effect attained; and Figure 5 shows an alternative embodiment of the air cleaner according to the invention featuring a more reliable connection thereof with the housing.
An air cleaner of an internal combustion engine with reference to Figures 1 and 2 comprises a housing 1 having secured thereto a tapered air intake duct 2 with an open end 3 and two pluralities of holes 4 and 5 forming two rows or belts 6 and 7 of such holes spaced from the inlet end 3 of the air intake duct 2 at distances of 0.14 - 0.26 and 0.34 - 0.42 the total length thereof, respectively.
The air cleaner of an internal combustion engine illustrated in Figure 1 operates as follows.
Air is sucked into the air cleaner both through the open end 3 of the air intake duct 2 and the calibrated holes 4 and grouped into the two rows or belts 6 and 7 spaced from the inlet end 3 the distances of 0.14 0.26 and 0.34 - 0.42 the total length of the air intake duct 2, respectively. The variable component of the volumetric flow rate of the air being sucked in, which is determined by variations in the engine cylinder displacements at open inlet valves, is weakened in the housing 1 of the air cleaner to be emitted both through the open end 3 of the air intake duct 2 and through the holes 4 and 5 of the two rows or belts 6 and 7.At frequencies determined by the equation: fk = K 21 sex 1 wherein K is 1, 2, 3 ... series of natural numbers; cisthevelocityofsound in m/sec; and 1 is the length of the air intake duct in m, resonance oscillations occur in the air intake duct 2.
Experiments have shown that in the practice of designing noise reducing measures a need arises very often to suppress the intensity of the resonance frequency noise produced by the air intake duct 2 at the first six lowerst frequency natural oscillations thereof (K = 1 - 6). Represented in Figure 3 are experimentally obtained curves of sound pressure taking place in the air intake duct 2 at these resonance frequencies (forms of oscillation of the standing waves produced) subject to specific shapes and dimensions of the air intake duct 2, largely the value of tapering angle of the duct 2 (in the order of between 4.5 and 6 degrees) and the effect of additional masses on the ends of the duct 2.Figure 3a shows the distribution of pressure in the first form of oscillations (K = 1); Figure 3b shows the same in the second form of oscillations; whereas Figures 3c, 3d, 3e and 3f represent the third, fourth, fifth and sixth forms of oscillation of the column of air in the air intake duct 2. From the analysis of the forms of pressure oscillations in the air intake duct 2 it follows that the most effective way of reducing the amount of noise emitted by the air intake duct 2 at frequencies fk for K = 1 6 is to locate the calibrated holes 4 and 5 in two cross-sections of the duct 2(rows or belts 6 and 7 of the holes 4 and 5) spaced at distances of 0.14 - 0.26 and 0.34 - 0.42 the total length of the air intake duct 2 as measured from the open inlet end 3 thereof.The best results are obtained when the total flow area of the holes 4 and 5 in each of the rows or belts 6 and 7 amounts to 0.2 - 0.4 the mean cross-sectional area of the air intake duct 2. No effective suppression of pulsed pressures is ensured when the total flow area of the holes 4 and 5 is less than 0.02 the means cross-sectional area of the air intake duct 2. Conversely, when the value of this flow are a is in excess of 0.04 the cross-sectional area of the duct 2 the effectiveness of the inlet end portion of the air intake duct 2 measured from the belt 7 of the holes 5 to the open end 3 thereof is impeded resulting in a less efficient suppression of the low frequency noise produced by air intake.Positioning the rows or belts 6 and 7 of the holes 4 and 5 in the above locations acts to effectively suppress resonance pressure oscillations in the duct 2 in the low range of the standing waves thereby permitting to effectively suppress the standing waves in the lower spectrum thereof and ensure reliable dampening of intake noise as best seen in Figure 4, wherein the full line (m) illustrates the noise intake spectrum for an air cleaner with the air intake duct 2 having no holes 4 and 5, while the dotted line (n) shows the same when such holes are provided. It is therefore evident that the provision of the holes reduces the intake noise in the range of from 315to 1600 Hz by 3 to 10 db.According to the experiments carried out, an increase in the number of rows or belts 6 and 7 of the holes 4 and 5 in the air intake duct 2 fails to improve the suppression of the first lowerst form of resonance oscillations of the system involving the interior of the housing 1 of the air cleaner 1 and the air intake duct 2 due to an increase in the lowerst natural frequency thereof. In addition, this leads to more labour consumed for the manufacture of the air cleaner.
For a more reliable connection of the air intake duct 2 to the housing 1 of the air cleaner, as well as for reducing the overall size of the construction, it is advisable that the air intake duct 2' (Figure 5) be bent or curved rather than straight, such that its axis would conform to the circumference of the air cleaner 1. For this purpose, as best seen in Figure 5, the air intake duct 2' includes two portions, particularly an inlet portion 8 and a connecting portion 9.
Preferably, the inlet portion 8 is fashioned in such a manner that its geometrical axis runs at a circumference of 1.2 to 2.5 the radius of the cylindrical base of the housing 1, the center of this circumference coinciding with the center of the cylindrical base of the housing 1. The connecting portion 9 which joins the inlet portion 8 with the housing 1 of the air cleaner is arranged such that its geometrical axis follows a circumference having a center laying in the intersection of the circumferential line of the cylin drical housing 1 and the line a-a joining the inlet portion 8 with the connecting portion 9 which passes through the center of the base of the housing 1.
During engine operation the housing 1 of the air cleaner and the air intake duct 2' are subjected to vibrations exited therein by the engine. The strength is determined by the exiting moments sectionally of the connection depending on the distances from the points of the air intake duct 2 to the section, as well as the strength of the section per se. As best seen in Figure 1, the section of this connection is subjected exclusively to bending stresses when the air intake duct 2 is straight, the forces exerted thereto being distributed only between the upper and lower portions of the section. With reference to the embodiment of the air duct illustrated in FigureS, mostly torsional moments are exerted to the housing 1 of the air cleaner, the whole section being thus subjected to torsional forces.
With equal weigth and length of the air intake ducts 2 and 2' this provides less stresses exerted to the connection of the air intake duct 2' with the housing 1 of the air cleaner.
In view of the foregoing, the level of noise produced by air intake may be reduced, while the ability of the system to withstand vibrations exerted thereon by the engine is improved. In addition, this allows to make the system more compact.
The objects and advantages of the present invention are accomplished in the manner described heretofore.

Claims (5)

1. An air cleaner of an internal cimbustion engine comprising a housing having an air intake duct; the air intake duct being provided with holes disposed radially relative to the geometrical axis thereof and defining two rows or belts of such holes spaced from an inlet end of the air intake duct at distances of 0.14 - 0.26 and 0.34 - 0.42 the total length of the air intake duct, respectively.
2. An air cleaner of an internal combustion engine according to claim 1 wherein each of the rows or belts comprises at least two holes.
3. An air cleaner of an internal combustion engine according to any of the claims 1 or 2 wherein the total flow area of the holes in each of the rows or belts amounts to 0.02 - 0.04 the mean cross-sectional area of the air intake duct.
4. An air cleaner of an internal combustion engine according to any of the claims 1 to 3 wherein the air intake duct is bent or curved, the geometrical axis thereof partially conforming to the contour of the air cleaner housing.
5. An air cleaner of an internal combustion engine as heretofore described with reference to the accompanying drawings.
GB8225942A 1982-09-08 1982-09-10 I c engine intake air cleaner and silencer Expired GB2127094B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE8205103A SE445573B (en) 1982-09-08 1982-09-08 AIR CLEANER WITH COMBUSTION ENGINE
GB8225942A GB2127094B (en) 1982-09-08 1982-09-10 I c engine intake air cleaner and silencer
DE19823234633 DE3234633A1 (en) 1982-09-08 1982-09-18 AIR FILTERS FOR COMBUSTION ENGINES
FR8215798A FR2533265A1 (en) 1982-09-08 1982-09-20 AIR PURIFIER OF AN INTERNAL COMBUSTION ENGINE

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8205103A SE445573B (en) 1982-09-08 1982-09-08 AIR CLEANER WITH COMBUSTION ENGINE
GB8225942A GB2127094B (en) 1982-09-08 1982-09-10 I c engine intake air cleaner and silencer
DE19823234633 DE3234633A1 (en) 1982-09-08 1982-09-18 AIR FILTERS FOR COMBUSTION ENGINES
FR8215798A FR2533265A1 (en) 1982-09-08 1982-09-20 AIR PURIFIER OF AN INTERNAL COMBUSTION ENGINE

Publications (2)

Publication Number Publication Date
GB2127094A true GB2127094A (en) 1984-04-04
GB2127094B GB2127094B (en) 1985-09-04

Family

ID=27432868

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8225942A Expired GB2127094B (en) 1982-09-08 1982-09-10 I c engine intake air cleaner and silencer

Country Status (4)

Country Link
DE (1) DE3234633A1 (en)
FR (1) FR2533265A1 (en)
GB (1) GB2127094B (en)
SE (1) SE445573B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7249652B2 (en) 2001-09-12 2007-07-31 Woco Industrietechnik Gmbh Fluid guideline, especially in the form of a tube for taking up untreated air in an air filter of a motor vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19903165A1 (en) * 1999-01-27 2000-08-03 Mann & Hummel Filter Suction device with a line section having openings
DE102008033802B4 (en) 2008-07-14 2013-10-17 A. Kayser Automotive Systems Gmbh Suction line element for an internal combustion engine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE681811C (en) * 1936-01-12 1939-10-02 Mahle Kg Air filter with device for suction noise absorption
US2789662A (en) * 1952-04-23 1957-04-23 Gen Motors Corp Air intake device for engines
FR1233482A (en) * 1958-09-10 1960-10-12 Mann & Hummel Filter Air filter with suction silencer, especially for internal combustion engines
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
FR1396790A (en) * 1964-05-28 1965-04-23 Knecht Filterwerke Gmbh Air filter forming an intake silencer for internal combustion engines, in particular for rotary piston engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7249652B2 (en) 2001-09-12 2007-07-31 Woco Industrietechnik Gmbh Fluid guideline, especially in the form of a tube for taking up untreated air in an air filter of a motor vehicle

Also Published As

Publication number Publication date
GB2127094B (en) 1985-09-04
DE3234633A1 (en) 1984-03-22
SE8205103D0 (en) 1982-09-08
FR2533265A1 (en) 1984-03-23
FR2533265B1 (en) 1985-01-18
SE445573B (en) 1986-06-30
SE8205103L (en) 1984-03-09

Similar Documents

Publication Publication Date Title
US6752240B1 (en) Sound attenuator for a supercharged marine propulsion device
US4267899A (en) Muffler assembly
EP0068368B1 (en) Muffler
US4192404A (en) Muffler for internal combustion engines
US7387188B2 (en) Sound absorber
EP0571380A1 (en) Silencer for gas induction and exhaust systems
CA1305898C (en) Manifold tuning structure
JPH05231316A (en) Dischage gas silencer for compressor
EP0192457A1 (en) Silencer
US5530214A (en) Venturi muffler
US4359135A (en) Muffler assembly
EP1088968A1 (en) Silencer
GB2127094A (en) I.C. Engine intake air cleaner and silencer
JPS61190158A (en) Intake system silencer for internal-combustion engine
GB2111122A (en) Silencer arrangement at the inlet of an I.C. engine air cleaner
KR100835709B1 (en) Exhaust silencer for engine exhaust system
KR100321361B1 (en) Exhaust noise reduction apparatus of a car
US6553955B1 (en) Intake manifold for internal combustion engine
JPH089416Y2 (en) Intake system silencer
US3989121A (en) Pulse converting exhaust silencing system
US20050000743A1 (en) Herschel-Quincke tube arrangements for motor vehicles
JPH0138298Y2 (en)
US3340954A (en) Muffler with elastomeric sound absorbing linings and by-pass valve
CN220791388U (en) Muffler device, air inlet system and vehicle
RU2038509C1 (en) Internal combustion engine

Legal Events

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