EP0186754B1 - Silenced air filter for internal combustion engines - Google Patents
Silenced air filter for internal combustion engines Download PDFInfo
- Publication number
- EP0186754B1 EP0186754B1 EP85114044A EP85114044A EP0186754B1 EP 0186754 B1 EP0186754 B1 EP 0186754B1 EP 85114044 A EP85114044 A EP 85114044A EP 85114044 A EP85114044 A EP 85114044A EP 0186754 B1 EP0186754 B1 EP 0186754B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- air
- air filter
- casing
- valve element
- 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.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 title description 4
- 230000000452 restraining effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 description 4
- 235000014676 Phragmites communis Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241000826860 Trapezium Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 230000001052 transient effect Effects 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
- F02M35/14—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
- F02M35/02—Air cleaners
- F02M35/026—Air cleaners acting by guiding the air over or through an oil or other liquid bath, e.g. combined with filters
-
- 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
- F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
Definitions
- This invention relates to an air filter for internal combustion engines in general, which is provided with a silencer unit for eliminating noise.
- Normal air filters for internal combustion engines are known to comprise a casing having an inlet port and an outlet port, and housing suitable filter means which are traversed by the air flowing towards the inlet manifold of the engine concerned.
- This excessive noise is mainly due to the hammering which the intake air stream undergoes when the engine intake valves close.
- the present patent provides and protects an air filter in which said noise is practically eliminated, by means of a simple and rational design.
- said valve element comprises an elastically deformable flap either in the form of a single element or comprising a plurality of adjacent coplanar sectors, and is disposed transversely to the passage of the filtered air directed towards the filter discharge port, and is further associated with a perforated transverse baffle, the apertures of which are alternately closed and opened by said flexible flap as stated.
- stop means arranged to limit the stroke or degree of deformation of the valve element, in order to safeguard its structure.
- US-A-4.438.828 discloses an air filter comprising a casing having an inlet port and an outlet port between which suitable filter means are interposed and including, downstream of the filter, an elastically deformable reed valve to enable the air to flow only in the direction of the filter outlet port.
- US-A-4.326.862 discloses a reed valve, comprising elastically deformable flaps, which is disposed transversely to the passage of the filtered air.
- the provision of the aforesaid silencer unit according to the invention means that that portion of air located between the filter and intake valve is trapped in the filter on termination of each intake stage.
- the initial maximum or peak value of the hammer is considerably reduced, as are consequently its surging and transient effects on the surrounding metal parts, and prevents the air flowing back from the filter, with almost total elimination of noise.
- Figure 1 shows a casing comprising an upper half shell 1 provided at its top with a side connector 2 for its connection to the intake manifold of an internal combustion engine, and at its base with a widened mouth 3.
- An intake cap 4 consisting of a thin hollow structure with a blank upper wall and a perforated lower wall is centrally fixed to the top of said upper half shell 1 (see Figure 1).
- Said lower half shell 6 has a narrower lower portion forming a container for containing an oil bath indicated diagrammatically by 33 in Figure 1, and an upper wider portion housing a normal filter cartridge 7, consisting essentially of a hollow holder filled with metal wire mesh.
- the filter cartridge 7 fits practically exactly into the upper part of the lower half shell 6, but from which there emerges an outer circumferential rim 8 fitted with a gasket 9, this latter being clamped into the widened mouth 3 of the upper half shell 1 by means of an outer circumferential rim 10 provided on the mouth of the lower half shell 6.
- an internal coaxial cup 12 having a depth greater than the level of the oil bath 33, and provided with a circumferential series of equidistant radial holes 13.
- the lower transverse wall of the filter cartridge 7 is provided with air inlet openings 15, and its upper transverse wall is provided with corresponding discharge openings 16 for the filtered air.
- a ring-shaped baffle 17 provided with a circumferential series of angularly equidistant apertures 18 is fixed in proximity to the open end of the upper half shell 1.
- each aperture 18 is shaped as an isosceles trapezium with rounded corners, with its major base facing outwards and with its height disposed radially, but said apertures 18 can obviously be of any other shape, for example circular.
- one aperture 18 is preferably provided for each discharge opening 16 of the filter cartridge.
- each aperture 18 there is upperly associated a flap 19 with its upper surface of greater extension than the corresponding aperture 18 ( Figure 2), said flap 19 being constituted by a suitable flexible material, for example a thin metal foil, a rubber-coated fabric or another suitable material, such as a synthetic material.
- a suitable flexible material for example a thin metal foil, a rubber-coated fabric or another suitable material, such as a synthetic material.
- a rigid stop member 20 for limiting the degree of deflection of the flaps 19.
- the member 20 consists essentially of a central flat connection ring from which there branches a series of upwardly bent, concave profiled plates (Figure 1).
- the plates extend radially and are provided in the same number as the flexible flaps 19, their plan profile being approximately equal to that of these latter.
- the stop member 20, the flexible flaps 19 and the perforated baffle 17 are fixed together by an inner circumferential set of rivets 21.
- a compression ring 22 provided lowerly with a shoulder which clamps a seal gasket 23 against the underlying filter cartridge 7.
- the filter When an engine intake valve opens, the filter is put under vacuum and is traversed in known manner by an air stream which causes the flaps 19 to lift or open (position shown by dashed and dotted lines).
Abstract
Description
- This invention relates to an air filter for internal combustion engines in general, which is provided with a silencer unit for eliminating noise.
- Normal air filters for internal combustion engines are known to comprise a casing having an inlet port and an outlet port, and housing suitable filter means which are traversed by the air flowing towards the inlet manifold of the engine concerned.
- Known air filters, and particularly oil bath filters, have the serious drawback of sometimes being excessively noisy, which creates sound- proofing problems for vehicle engine compartments, makes the use of self-propelled machines with a non-enclosed or only partly enclosed engine uncomfortable, and considerably increases the noise level in working environments where fixed engine systems are installed.
- This excessive noise is mainly due to the hammering which the intake air stream undergoes when the engine intake valves close.
- This is because when an intake valve closes, the mass of air flowing towards the intake manifold is instantaneously halted and remains trapped between the intake manifold and the filter means of the air filter. This halting of the mass of air subjects it to a hammering effect which transmits vibrations to the surrounding metal parts, with simultaneous generation of said excessive noise, and causes part of the air to flow backwards, so increasing the noise.
- Up to the present time the various attempts to reduce the noise level of such filters have been directed towards special shaping of the passages and chambers traversed by the intake air stream, but such attempts have not only not given satisfactory results, but have excessively complicated the filter construction, thus considerably increasing their cost.
- The present patent provides and protects an air filter in which said noise is practically eliminated, by means of a simple and rational design.
- This is attained according to the invention by providing, in a casing having an inlet port and an outlet port between which suitable filter means are interposed, one elastically deformable valve element, inside the casing and downstream of the filter means, which divides the casing in two parts, the volume of the part upstream of the valve seat being nearly wholly filled with the filter means; the valve element is arranged to enable the air to flow only in the direction of the outlet port.
- According to the invention, said valve element comprises an elastically deformable flap either in the form of a single element or comprising a plurality of adjacent coplanar sectors, and is disposed transversely to the passage of the filtered air directed towards the filter discharge port, and is further associated with a perforated transverse baffle, the apertures of which are alternately closed and opened by said flexible flap as stated.
- Finally, to the rear of the valve element there are preferably disposed stop means arranged to limit the stroke or degree of deformation of the valve element, in order to safeguard its structure.
- US-A-4.438.828 (Nagakawa) discloses an air filter comprising a casing having an inlet port and an outlet port between which suitable filter means are interposed and including, downstream of the filter, an elastically deformable reed valve to enable the air to flow only in the direction of the filter outlet port.
- US-A-4.326.862 (Suzuki) discloses a reed valve, comprising elastically deformable flaps, which is disposed transversely to the passage of the filtered air.
- But the reed valves in US-A-4.438.828 and in US-A-4.326.862 are disposed along a pipe and downstream of the filter casing and further they have not the purpose of reducing the noise.
- The provision of the aforesaid silencer unit according to the invention means that that portion of air located between the filter and intake valve is trapped in the filter on termination of each intake stage.
- By this means, the initial maximum or peak value of the hammer is considerably reduced, as are consequently its surging and transient effects on the surrounding metal parts, and prevents the air flowing back from the filter, with almost total elimination of noise.
- The constructional characteristics and merits of the invention will be more apparent from the description of a preferred embodiment of an oil bath air filter given hereinafter by way of nonlimiting example with reference to the figures of the accompanying drawings.
- Figure 1 is an elevational section through the invention.
- Figure 2 is a section on the line II-II of Figure 1.
- The filter shown in the figures is not to be considered in any way limitative of the invention, as the characterising elements of the invention are perfectly adaptable with identical results to general known filters, whether of dry or of oil bath type.
- Figure 1 shows a casing comprising an
upper half shell 1 provided at its top with aside connector 2 for its connection to the intake manifold of an internal combustion engine, and at its base with a widenedmouth 3. - An intake cap 4 consisting of a thin hollow structure with a blank upper wall and a perforated lower wall is centrally fixed to the top of said upper half shell 1 (see Figure 1).
- From this lower wall there extends a
central tube 5 coaxial to theupper half shell 1, saidtube 5 extending to reach themouth 3 of this latter. - Into the base of the
upper half shell 1 there is inserted a removablelower half shell 6, which is provided with two diametrically opposing external clips 11 (see Figure 2) for clipping over said widenedmouth 3. - Said
lower half shell 6 has a narrower lower portion forming a container for containing an oil bath indicated diagrammatically by 33 in Figure 1, and an upper wider portion housing anormal filter cartridge 7, consisting essentially of a hollow holder filled with metal wire mesh. - The
filter cartridge 7 fits practically exactly into the upper part of thelower half shell 6, but from which there emerges an outercircumferential rim 8 fitted with agasket 9, this latter being clamped into the widenedmouth 3 of theupper half shell 1 by means of an outer circumferential rim 10 provided on the mouth of thelower half shell 6. - At the base of the
lower half shell 6 there is provided an internalcoaxial cup 12 having a depth greater than the level of theoil bath 33, and provided with a circumferential series of equidistantradial holes 13. - Into said
cup 12, and into theoil bath 33, there is inserted the lower end of acentral tube 14 which passes through thefilter cartridge 14, and its upper end is mounted over the lower end of thetube 5. - The lower transverse wall of the
filter cartridge 7 is provided withair inlet openings 15, and its upper transverse wall is provided withcorresponding discharge openings 16 for the filtered air. - A ring-
shaped baffle 17 provided with a circumferential series of angularlyequidistant apertures 18 is fixed in proximity to the open end of theupper half shell 1. - As shown in Figure 2, each
aperture 18 is shaped as an isosceles trapezium with rounded corners, with its major base facing outwards and with its height disposed radially, but saidapertures 18 can obviously be of any other shape, for example circular. - According to the invention, one
aperture 18 is preferably provided for each discharge opening 16 of the filter cartridge. - With each
aperture 18 there is upperly associated aflap 19 with its upper surface of greater extension than the corresponding aperture 18 (Figure 2), saidflap 19 being constituted by a suitable flexible material, for example a thin metal foil, a rubber-coated fabric or another suitable material, such as a synthetic material. - In the figure the
flaps 19 are separate from each other, but they could obviously derive from a common central column. - Above the
flaps 19 there is disposed arigid stop member 20 for limiting the degree of deflection of theflaps 19. - The
member 20 consists essentially of a central flat connection ring from which there branches a series of upwardly bent, concave profiled plates (Figure 1). - The plates extend radially and are provided in the same number as the
flexible flaps 19, their plan profile being approximately equal to that of these latter. - The
stop member 20, theflexible flaps 19 and theperforated baffle 17 are fixed together by an inner circumferential set ofrivets 21. - Finally, between the
baffles 17 and thetube 5 of theupper half shell 1 there is acompression ring 22 provided lowerly with a shoulder which clamps a seal gasket 23 against theunderlying filter cartridge 7. - When under non-working conditions, the
flexible flaps 19 rest against theperforated baffle 17 and close the apertures 18 (position indicated by full lines in Figure 1). - When an engine intake valve opens, the filter is put under vacuum and is traversed in known manner by an air stream which causes the
flaps 19 to lift or open (position shown by dashed and dotted lines). - When an intake stage terminates, the mass of moving air builds up and becomes compressed in the upper or discharge part of the filter, to cause instantaneous closure of the
flaps 19. - As the air mass upstream of the baffle is small, the residual air hammer due to repeated closure of an intake valve and the damped oscillation of the pressure induced by said hammer are also small, as are therefore, the filter vibration and noise.
- All the objects of the invention are therefore attained.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85114044T ATE42609T1 (en) | 1984-12-04 | 1985-11-05 | DAMPED AIR FILTER FOR COMBUSTION ENGINES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT46882/84A IT1181144B (en) | 1984-12-04 | 1984-12-04 | AIR FILTER FOR INTERNAL COMBUSTION ENGINES OF SOUNDPROOF TYPE |
IT4688284 | 1984-12-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0186754A1 EP0186754A1 (en) | 1986-07-09 |
EP0186754B1 true EP0186754B1 (en) | 1989-04-26 |
Family
ID=11260157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85114044A Expired EP0186754B1 (en) | 1984-12-04 | 1985-11-05 | Silenced air filter for internal combustion engines |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0186754B1 (en) |
AT (1) | ATE42609T1 (en) |
DE (1) | DE3569781D1 (en) |
ES (1) | ES291190Y (en) |
IT (1) | IT1181144B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19940610A1 (en) | 1999-08-27 | 2001-03-01 | Mann & Hummel Filter | Air filter |
CN103244313B (en) * | 2012-02-02 | 2016-05-25 | 张永民 | The combustion air cleaner of efficient energy-saving and emission-reducing |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1576542A1 (en) * | 1966-04-29 | 1970-04-23 | Fispa Spa | Sealing device on oil bath air filters |
US4326862A (en) * | 1980-06-10 | 1982-04-27 | Nagatoshi Suzuki | Air cleaner for engines, having back flow gas shut-off function |
JPS57188758A (en) * | 1981-05-18 | 1982-11-19 | Honda Motor Co Ltd | Air cleaner device for motor cycle |
-
1984
- 1984-12-04 IT IT46882/84A patent/IT1181144B/en active
-
1985
- 1985-11-05 EP EP85114044A patent/EP0186754B1/en not_active Expired
- 1985-11-05 AT AT85114044T patent/ATE42609T1/en not_active IP Right Cessation
- 1985-11-05 DE DE8585114044T patent/DE3569781D1/en not_active Expired
- 1985-12-03 ES ES1985291190U patent/ES291190Y/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3569781D1 (en) | 1989-06-01 |
IT8446882A0 (en) | 1984-12-04 |
IT1181144B (en) | 1987-09-23 |
ES291190U (en) | 1986-05-16 |
IT8446882A1 (en) | 1986-06-04 |
ATE42609T1 (en) | 1989-05-15 |
ES291190Y (en) | 1987-01-16 |
EP0186754A1 (en) | 1986-07-09 |
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