EP2800894A1 - Filtering device with double tubular filter for the air sucked in by an engine - Google Patents

Filtering device with double tubular filter for the air sucked in by an engine

Info

Publication number
EP2800894A1
EP2800894A1 EP13705563.8A EP13705563A EP2800894A1 EP 2800894 A1 EP2800894 A1 EP 2800894A1 EP 13705563 A EP13705563 A EP 13705563A EP 2800894 A1 EP2800894 A1 EP 2800894A1
Authority
EP
European Patent Office
Prior art keywords
air
filtering device
wall
box
presents
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
EP13705563.8A
Other languages
German (de)
French (fr)
Other versions
EP2800894B1 (en
Inventor
Gaetano Bergami
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.)
BMC SRL
Original Assignee
BMC SRL
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 BMC SRL filed Critical BMC SRL
Publication of EP2800894A1 publication Critical patent/EP2800894A1/en
Application granted granted Critical
Publication of EP2800894B1 publication Critical patent/EP2800894B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M35/02—Air cleaners
    • F02M35/024—Air cleaners using filters, e.g. moistened
    • F02M35/02475—Air cleaners using filters, e.g. moistened characterised by the shape of the filter element
    • F02M35/02483—Cylindrical, conical, oval, spherical or the like filter elements; wounded filter elements

Definitions

  • the present invention relates to a filtering device for the air sucked in by an engine.
  • the filtering device for air sucked in by the engine comprises a parallelepiped-shaped air-box which houses inside it a flat filter which is also parallelepiped-shaped; the filter divides the air-box into an inlet chamber, which is arranged upstream of the filter and communicates with the outside by means of at least one inlet opening, and an outlet chamber, which is arranged downstream of the filter and communicates with the engine suction system by means of at least one outlet opening.
  • the filter must have a free area of passage which is sufficiently extended to have a loss of load (i.e. a difference ' in pressure between the air upstream and the air downstream of the filter) which is fairly ' limited, since the higher the loss of load caused by the filter, the higher is the reduction in maximum power which may be generated by the engine.
  • the outlet chamber must also have a large enough volume to perform the function of expansion box of the suction system efficiently, in order to store a sufficiently high quantity of filtered air to absorb fluctuations in the quantity of air sucked in by the suction system.
  • the object of the present invention is to provide a filtering device for the air sucked in by an engine, said filtering device not having the problems described above and simultaneously being easy and inexpensive to manufacture.
  • a filtering device for the air sucked in by an engine is provided, according to the appended claims.
  • Figures 1 and 2 show two different perspective views of a filtering device for air sucked in by an engine according to the present invention
  • Figures 3 and 4 show two different perspective views of the filtering device of Figures 1 and 2 with removal of a lid of an air-box;
  • Figure 5 is a plan view of the filtering device of Figures 1 and 2;
  • Figure 6 is a plan view of the filtering device of Figures 1 and 2 with removal of a lid of an air-box;
  • Figure 7 is a schematic view, in longitudinal cross- section and with parts removed for clarity of the filtering device of Figures 1 and 2;
  • Figures 8 and 9 are two different schematic views, in cross-section and with parts removed for clarity of the filtering device of Figures 1 and 2;
  • Figure 10 is a perspective and schematic view of two truncated cone-shaped filters housed inside an air-box of the filtering device of Figures 1 and 2. PREFERRED EMBODIMENTS OF THE INVENTION
  • the number 1 denotes in its entirety a filtering device for a suction system of an internal combustion engine (not shown) .
  • the filtering device 1 comprises an air-box 2 which defines in its inside a cavity 3 (visible in Figures figure 3, 4 and 6) having two inlet openings 4 towards the outside and two outlet openings 5 towards the suction system of the internal combustion engine 1. Also, filtering device 1 comprises two filters 6 which are housed inside air-box 2 and are arranged between inlet openings 4 and outlet opening 5. Each filter 6 is directly coupled to a corresponding inlet opening 4 and therefore divides cavity 3 into an inlet chamber, which is arranged upstream of filter 6 and communicates with the outside by means of inlet opening 4, and an outlet chamber, which is arranged downstream of filter 6 and communicates with the suction system of the engine 1 by means of both outlet openings 5.
  • each filter 6 is' arranged in correspondence to a relative inlet opening 4 and presents a tubular shape (i.e. the inlet hole of each filter 6 coincides with relative inlet opening 4) .
  • Each filter 6 comprises a filtering material 7 with a truncated cone tubular shape and two annular end members 8 and 9 which are arranged on opposite sides of filtering material 7; the larger base of filtering material 7 is arranged in correspondence to relative inlet opening 4 in which filtering material 7 is engaged by end member 8, whereas the smaller base of filtering material 7 is arranged inside air-box 2 in which filtering material 7 is engaged by end member 9.
  • filtering material 7 of each filter 6 has a cylindrical tubular shape rather than a truncated cone tubular shape .
  • filtering material 7 could be made of cotton fabric or non-woven fabric or other fibres enclosed between two layers of thin metal mesh which give form and resistance to said filtering material 7.
  • End member 8 of each filter 6 presents a central through hole 10 (forming the inlet hole of filter 6) which is arranged in correspondence to inlet opening 4 to allow the air to flow directly inside filter 6; central hole 10 is surrounded by an annular groove 11 inside which filtering material 7 is inserted and attached inside said groove using adhesive, resin or similar materials.
  • End member 9 of each filter 6 presents no openings and supports a cone-shaped central baffle plate 12 and extends inside filtering material 7; a tip (which is round according to a different embodiment not shown) of baffle plate 12 is arranged close to central hole 10 of end member 8.
  • baffle plate 12 presents a concave parabolic lateral surface with the concavity turned towards a central axis of symmetry.
  • end member 9 presents an annular groove into which filtering material 7 is inserted and attached inside said groove using adhesive, resin or similar materials.
  • air-box 2 is cup-shaped and parallelepiped-shaped; therefore, air-box 2 comprises a lower wall 14, two minor lateral walls 15 which are parallel and opposite to each other and extend perpendicularly from lower wall 14, two major lateral walls 16 which are parallel and opposite to each other and extend perpendicularly from lower wall 14, and an open upper end opposite lower wall 14. Said two major lateral walls 16 are interposed between said two minor lateral walls 15, i.e. each major lateral wall 16 connects said two minor lateral walls 15 to each other and is perpendicular to said two minor lateral walls 15.
  • Air-box 2 has a removable lid (typically screwed onto lateral walls 15 and 16) which closes the open upper end and forms an upper wall of air-box 2.
  • each inlet opening 4 receives air from a dynamic air intake present on a front or lateral wall of the vehicle; in this embodiment, filtering device 1 comprises two tubular supply conduits 18, each of which connects inlet opening 4 with the dynamic air intake present on the front or lateral wall of the vehicle.
  • filtering device 1 comprises two tubular supply conduits 18, each of which connects inlet opening 4 with the dynamic air intake present on the front or lateral wall of the vehicle.
  • said two inlet openings 4 are envisaged facing and coaxial to each other by means of said two minor lateral walls 15 of air-box 2; said two filters 6 are therefore arranged coaxial to each other and one after the other.
  • Said two outlet openings 5 are envisaged side by side by means of said major lateral wall 16. Consequently, said two inlet openings 4 are arranged perpendicularly to said two outlet openings 5.
  • Said two filters 6 are joined centrally in correspondence to said two end members 9 which are rigidly connected to each other in an inseparable manner; in other words, by means of joining said two end members 9, said two filters 6 are mechanically connected to each other, forming together a single double filter 6.
  • said two end members 9 of said two filters 6 form a single member (i.e. without any interruption in continuity) .
  • an inner wall 19 is envisaged which is parallel to minor lateral walls 15 of air-box 2 and centrally divides cavity 3 into two mirror-like half-cavities , each of which contains a corresponding filter 6, communicates with the outside by means of a corresponding inlet opening 4, and communicates with the suction system of the engine by means of a corresponding outlet opening 5.
  • inner wall 19 presents a central through hole 20 through which said two end members 9 of filters 6 are arranged.
  • inner wall 19 is divided into a lower portion 21 which projects upwards from lower wall 13 of air-box 2 and is attached laterally to said major lateral walls 16 of air-box 2, and an upper portion 22 which projects downwards from lid 17.
  • Lower portion 21 of inner wall 19 is connected in an inseparable manner to walls 13 and 16 of air-box 2, and similarly, upper portion 22 of inner wall 19 is connected in an inseparable manner to lid 17.
  • an elastic ring 23 is interposed, which is preferably externally arranged around said two end members 9.
  • Lower portion 21 of inner wall 19 extends without gaps between said two major lateral walls 16 of air-box 2, whilst upper portion 22 of inner wall 19 presents a transverse dimension that is smaller than the transverse dimension of cavity 3 of air-box 2 measured between said two major lateral walls 15 and 16; in this manner, at the sides of upper portion 22 of inner wall 19 there are relatively wide openings which allow an exchange of air through inner wall 19.
  • inner wall 19 presents a free communication opening between the two half-cavities divided by inner wall 19 to allow an exchange of air through said inner wall 19.
  • an upper edge of lower portion 21 of inner wall 19 does not touch (and thus is arranged at a certain distance from) a lower edge of upper portion 22; in this manner, when lid 17 is attached (screwed) onto walls 15 and 16 of air-box 2, said two end members 9 are "clamped” between said two portions 21 and 22 of inner wall 19 (with interposition of elastic ring 23 which compensates for any construction tolerance) and are therefore firmly connected to air-box 2.
  • a function of inner wall 19 is offering a central anchorage point to filters 6, since it allows “clamping” in a vice of end members 9 between said two portions 21 and 22 of said inner wall 19.
  • Filtering device 1 is subject to the mechanical stress present inside the engine well of the vehicle (caused by acceleration of the vehicle and the vibrations of the internal combustion engine) , and the presence of inner wall 19 improves the mechanical connection between filters 6 and air- box 2, increasing the total mechanical resistance of said filtering device 1.
  • Elastic ring 23 has both the function of compensating for any construction tolerance and the function of introducing a certain elastic deformability to the mechanical connection system of filters 6 to air-box 2 to reduce the total mechanical stress acting on filters 6. It is important to note that elastic ring 23 has no pneumatic seal function, since inner wall 19 does not divide cavity 3 in an airtight manner and, on the contrary, allows an exchange of air through said inner wall 19.
  • a further function of inner wall 19 is centrally dividing cavity 3 into two mirror-like half-cavities , in a manner to create a certain pneumatic division between said two filters 6, ⁇ this pneumat ic divi s ion i s not "absolute", since inner wall 19 is not airtight (on the contrary, it presents wide openings for passage between the two half -cavities) , but nonetheless improves the fluid dynamics of said two filters 6, avoiding reciprocal damaging interference.
  • said two inlet opening 4 present a square cross-section whilst said two outlet openings 5 present a circular cross-section; in each filter 6, end member 8 is shaped to obtain geometrical adaptation between the square shape of inlet opening 4 and the round shape of filtering material 7.
  • end member 8 is arranged at a certain distance (short, in any case) from minor lateral wall 15 and is connected to inlet opening 4 by means of a connection tube which may be an integral part of minor lateral wall 15 (or may be a single piece with minor lateral wall 15) .
  • lower wall 14 of air-box 2 which defines the bottom of cavity 3 presents at least one through drainage hole for drainage of any water which may be present inside cavity 3 (due both to condensation of the humidity in the air sucked in and due to direct entry of rainwater) .
  • lower wall 14 of air-box 2 which defines the bottom of cavity 3 presents a slope which converges towards the drainage hole (or towards the drainage holes if several drainage holes are envisaged) ; in other words, the drainage hole represents the lowest point of the entire lower wall 14 of air-box 2 which defines the bottom of cavity 3 in a manner that any water which may be present inside cavity 3 slides towards the drainage hole due to gravity. It is important to note that the drainage hole must be wide enough to allow the water to flow downwards due to gravity, i.e. outside cavity 3 of air-box 2, but must also be small enough to reduce to the necessary minimum any loss of pressure which the drainage hole generates in cavity 3.
  • each filter 6 end member 8 is surrounded by a support frame 24 which presents the same shape and dimensions of the transverse section of cavity 3 in correspondence to said minor lateral walls 15; in this manner, support frame 24 "fits" perfectly inside cavity 3 by leaning all of its sides against walls 13, 16 and 17 of air-box 2 and therefore guarantees an optimal mechanical connection between filter 6 and air-box 2.
  • walls 13, 16 and/or 17 of air-box 2 could present slots which define housing inside which frame 24 is arranged.
  • lid 17 could press from above onto support frames 24 of filters 6 (possibly with a small elastic deformation) to increase the force of the mechanical connection between filters 6 and air-box 2.
  • the operator simply has to remove lid 17 (unscrewing the corresponding screws) and then vertically raise said two filters 6 from air-box 2; it is therefore clear that maintenance and cleaning of filtering device 1 is extremely simple.
  • Filtering device 1 as described above presents numerous advantages .
  • filtering device 1 In the first place, filtering device 1 described above is easy and inexpensive to manufacture and allows rapid replacement of said filters 6 once lid 7 is opened.
  • the inlet chamber is also limited to the internal volumes of said two filters 6, whilst the remainder of cavity 3 forms the outlet chamber; the inlet chamber therefore presents an extremely limited volume in favour of the outlet chamber.
  • almost the entire volume of cavity 3 is formed of the outlet chamber which therefore presents an extremely large volume; in this manner, the outlet chamber efficiently performs its function as an expansion box of the suction system by storing a sufficiently high quantity of filtered air to absorb any fluctuations in the quantity of air sucked in by the suction system.
  • Filtering device 1 described above also presents a high mechanical sturdiness (which allows the mechanical stress present in the engine well of the vehicle to be easily sustained) and a simple and rapid disassembly to extract said two filters 6 (an operation necessary for periodic cleaning of filtering material 7) .
  • This result is essentially obtained thanks to inner wall 19 divided into said two portions 21 and 22 which clamp said two end members 9 between them.
  • filtering device 1 described above presents a total free area of flow of said filters 6 which is decidedly larger than a similar traditional filtering device provided with a single flat filter; in this manner, filtering device 1 described above presents a limited loss of load (i.e. a difference in pressure between the air upstream and downstream of said filters 6) and therefore allows the engine to supply a higher maximum power.

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  • 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)

Abstract

A filtering device (1) for the air sucked in by an engine; said filtering device (1) comprising: a parallelepiped-shaped air-box (2) defining inside it a cavity (3) and presenting at least two inlet openings (4) to the outside and at least one outlet opening (5) towards an engine suction system; and two filters (6), each of which is housed inside the air-box (2) and in turn presents : a tubular-shaped filtering material (7), a first end member (8) which closes a first end of the filtering material (7) and presents a central through hole (10) arranged in correspondence to the inlet opening (4) to allow the air to flow directly inside the filter (6), and a second end member (9) which closes a second end of the filtering material (7) opposite the first end and has no openings.

Description

"FILTERING DEVICE WITH DOUBLE TUBULAR FILTER FOR THE AIR SUCKED IN BY AN ENGINE"
TECHNICAL SECTOR
The present invention relates to a filtering device for the air sucked in by an engine.
PRIOR ART
On certain vehicles available in the market, the filtering device for air sucked in by the engine comprises a parallelepiped-shaped air-box which houses inside it a flat filter which is also parallelepiped-shaped; the filter divides the air-box into an inlet chamber, which is arranged upstream of the filter and communicates with the outside by means of at least one inlet opening, and an outlet chamber, which is arranged downstream of the filter and communicates with the engine suction system by means of at least one outlet opening.
The filter must have a free area of passage which is sufficiently extended to have a loss of load (i.e. a difference ' in pressure between the air upstream and the air downstream of the filter) which is fairly' limited, since the higher the loss of load caused by the filter, the higher is the reduction in maximum power which may be generated by the engine. The outlet chamber must also have a large enough volume to perform the function of expansion box of the suction system efficiently, in order to store a sufficiently high quantity of filtered air to absorb fluctuations in the quantity of air sucked in by the suction system.
It is clear from the above that in order not to penalise engine performance, the dimensions of the air-box must be fairly large,- however, in the vehicles currently available on the market, the space in the engine well available to house the filter box is increasingly limited. Consequently, in more recent vehicles, it is becoming increasingly complicated to arrange in the engine well an air-box which is large enough not to penalise engine performance.
DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a filtering device for the air sucked in by an engine, said filtering device not having the problems described above and simultaneously being easy and inexpensive to manufacture. According to the present invention, a filtering device for the air sucked in by an engine is provided, according to the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with reference to the attached drawings, which show several non-limiting examples of embodiment, wherein:
• Figures 1 and 2 show two different perspective views of a filtering device for air sucked in by an engine according to the present invention;
• Figures 3 and 4 show two different perspective views of the filtering device of Figures 1 and 2 with removal of a lid of an air-box;
• Figure 5 is a plan view of the filtering device of Figures 1 and 2;
• Figure 6 is a plan view of the filtering device of Figures 1 and 2 with removal of a lid of an air-box;
• Figure 7 is a schematic view, in longitudinal cross- section and with parts removed for clarity of the filtering device of Figures 1 and 2;
• Figures 8 and 9 are two different schematic views, in cross-section and with parts removed for clarity of the filtering device of Figures 1 and 2; and
• Figure 10 is a perspective and schematic view of two truncated cone-shaped filters housed inside an air-box of the filtering device of Figures 1 and 2. PREFERRED EMBODIMENTS OF THE INVENTION
In Figures 1-6, the number 1 denotes in its entirety a filtering device for a suction system of an internal combustion engine (not shown) .
The filtering device 1 comprises an air-box 2 which defines in its inside a cavity 3 (visible in Figures figure 3, 4 and 6) having two inlet openings 4 towards the outside and two outlet openings 5 towards the suction system of the internal combustion engine 1. Also, filtering device 1 comprises two filters 6 which are housed inside air-box 2 and are arranged between inlet openings 4 and outlet opening 5. Each filter 6 is directly coupled to a corresponding inlet opening 4 and therefore divides cavity 3 into an inlet chamber, which is arranged upstream of filter 6 and communicates with the outside by means of inlet opening 4, and an outlet chamber, which is arranged downstream of filter 6 and communicates with the suction system of the engine 1 by means of both outlet openings 5.
According to what is shown in Figure 7, each filter 6 is' arranged in correspondence to a relative inlet opening 4 and presents a tubular shape (i.e. the inlet hole of each filter 6 coincides with relative inlet opening 4) . Each filter 6 comprises a filtering material 7 with a truncated cone tubular shape and two annular end members 8 and 9 which are arranged on opposite sides of filtering material 7; the larger base of filtering material 7 is arranged in correspondence to relative inlet opening 4 in which filtering material 7 is engaged by end member 8, whereas the smaller base of filtering material 7 is arranged inside air-box 2 in which filtering material 7 is engaged by end member 9. According to an equivalent embodiment which is not shown, filtering material 7 of each filter 6 has a cylindrical tubular shape rather than a truncated cone tubular shape . By way of example, filtering material 7 could be made of cotton fabric or non-woven fabric or other fibres enclosed between two layers of thin metal mesh which give form and resistance to said filtering material 7.
End member 8 of each filter 6 presents a central through hole 10 (forming the inlet hole of filter 6) which is arranged in correspondence to inlet opening 4 to allow the air to flow directly inside filter 6; central hole 10 is surrounded by an annular groove 11 inside which filtering material 7 is inserted and attached inside said groove using adhesive, resin or similar materials. End member 9 of each filter 6 presents no openings and supports a cone-shaped central baffle plate 12 and extends inside filtering material 7; a tip (which is round according to a different embodiment not shown) of baffle plate 12 is arranged close to central hole 10 of end member 8. According to a preferred embodiment not shown, baffle plate 12 presents a concave parabolic lateral surface with the concavity turned towards a central axis of symmetry. Also, end member 9 presents an annular groove into which filtering material 7 is inserted and attached inside said groove using adhesive, resin or similar materials.
According to the embodiment shown in the appended figures, air-box 2 is cup-shaped and parallelepiped-shaped; therefore, air-box 2 comprises a lower wall 14, two minor lateral walls 15 which are parallel and opposite to each other and extend perpendicularly from lower wall 14, two major lateral walls 16 which are parallel and opposite to each other and extend perpendicularly from lower wall 14, and an open upper end opposite lower wall 14. Said two major lateral walls 16 are interposed between said two minor lateral walls 15, i.e. each major lateral wall 16 connects said two minor lateral walls 15 to each other and is perpendicular to said two minor lateral walls 15. Air-box 2 has a removable lid (typically screwed onto lateral walls 15 and 16) which closes the open upper end and forms an upper wall of air-box 2.
According to a preferred embodiment shown in Figure 7, each inlet opening 4 receives air from a dynamic air intake present on a front or lateral wall of the vehicle; in this embodiment, filtering device 1 comprises two tubular supply conduits 18, each of which connects inlet opening 4 with the dynamic air intake present on the front or lateral wall of the vehicle. In this manner, when the vehicle is moving, the air pressure against the front or lateral wall of the vehicle allows overpressure to be generated inside cavity 3, which is higher the higher the speed of the vehicle; this overpressure inside cavity 3 increases filling of the engine cylinders and therefore increases the power generated by said engine.
According to what is shown in Figure 6 , said two inlet openings 4 are envisaged facing and coaxial to each other by means of said two minor lateral walls 15 of air-box 2; said two filters 6 are therefore arranged coaxial to each other and one after the other. Said two outlet openings 5 are envisaged side by side by means of said major lateral wall 16. Consequently, said two inlet openings 4 are arranged perpendicularly to said two outlet openings 5.
Said two filters 6 are joined centrally in correspondence to said two end members 9 which are rigidly connected to each other in an inseparable manner; in other words, by means of joining said two end members 9, said two filters 6 are mechanically connected to each other, forming together a single double filter 6. Preferably, said two end members 9 of said two filters 6 form a single member (i.e. without any interruption in continuity) . According to a preferred embodiment shown in Figures 7, 8 and 9, an inner wall 19 is envisaged which is parallel to minor lateral walls 15 of air-box 2 and centrally divides cavity 3 into two mirror-like half-cavities , each of which contains a corresponding filter 6, communicates with the outside by means of a corresponding inlet opening 4, and communicates with the suction system of the engine by means of a corresponding outlet opening 5. In particular, inner wall 19 presents a central through hole 20 through which said two end members 9 of filters 6 are arranged.
Preferably, inner wall 19 is divided into a lower portion 21 which projects upwards from lower wall 13 of air-box 2 and is attached laterally to said major lateral walls 16 of air-box 2, and an upper portion 22 which projects downwards from lid 17. Lower portion 21 of inner wall 19 is connected in an inseparable manner to walls 13 and 16 of air-box 2, and similarly, upper portion 22 of inner wall 19 is connected in an inseparable manner to lid 17.
According to a preferred embodiment, between central through hole 20 of inner wall 19 and said two end members 9 of filters 6, an elastic ring 23 is interposed, which is preferably externally arranged around said two end members 9.
Lower portion 21 of inner wall 19 extends without gaps between said two major lateral walls 16 of air-box 2, whilst upper portion 22 of inner wall 19 presents a transverse dimension that is smaller than the transverse dimension of cavity 3 of air-box 2 measured between said two major lateral walls 15 and 16; in this manner, at the sides of upper portion 22 of inner wall 19 there are relatively wide openings which allow an exchange of air through inner wall 19. In other words, inner wall 19 presents a free communication opening between the two half-cavities divided by inner wall 19 to allow an exchange of air through said inner wall 19. According to a preferred embodiment, an upper edge of lower portion 21 of inner wall 19 does not touch (and thus is arranged at a certain distance from) a lower edge of upper portion 22; in this manner, when lid 17 is attached (screwed) onto walls 15 and 16 of air-box 2, said two end members 9 are "clamped" between said two portions 21 and 22 of inner wall 19 (with interposition of elastic ring 23 which compensates for any construction tolerance) and are therefore firmly connected to air-box 2.
A function of inner wall 19 is offering a central anchorage point to filters 6, since it allows "clamping" in a vice of end members 9 between said two portions 21 and 22 of said inner wall 19. Filtering device 1 is subject to the mechanical stress present inside the engine well of the vehicle (caused by acceleration of the vehicle and the vibrations of the internal combustion engine) , and the presence of inner wall 19 improves the mechanical connection between filters 6 and air- box 2, increasing the total mechanical resistance of said filtering device 1. Elastic ring 23 has both the function of compensating for any construction tolerance and the function of introducing a certain elastic deformability to the mechanical connection system of filters 6 to air-box 2 to reduce the total mechanical stress acting on filters 6. It is important to note that elastic ring 23 has no pneumatic seal function, since inner wall 19 does not divide cavity 3 in an airtight manner and, on the contrary, allows an exchange of air through said inner wall 19.
A further function of inner wall 19 is centrally dividing cavity 3 into two mirror-like half-cavities , in a manner to create a certain pneumatic division between said two filters 6,· this pneumat ic divi s ion i s not "absolute", since inner wall 19 is not airtight (on the contrary, it presents wide openings for passage between the two half -cavities) , but nonetheless improves the fluid dynamics of said two filters 6, avoiding reciprocal damaging interference.
According to what is shown in the appended figures, said two inlet opening 4 present a square cross-section whilst said two outlet openings 5 present a circular cross-section; in each filter 6, end member 8 is shaped to obtain geometrical adaptation between the square shape of inlet opening 4 and the round shape of filtering material 7. According to a possible embodiment not shown, in each filter 6, end member 8 is arranged at a certain distance (short, in any case) from minor lateral wall 15 and is connected to inlet opening 4 by means of a connection tube which may be an integral part of minor lateral wall 15 (or may be a single piece with minor lateral wall 15) .
According to a possible embodiment, lower wall 14 of air-box 2 which defines the bottom of cavity 3 presents at least one through drainage hole for drainage of any water which may be present inside cavity 3 (due both to condensation of the humidity in the air sucked in and due to direct entry of rainwater) . Preferably, lower wall 14 of air-box 2 which defines the bottom of cavity 3 presents a slope which converges towards the drainage hole (or towards the drainage holes if several drainage holes are envisaged) ; in other words, the drainage hole represents the lowest point of the entire lower wall 14 of air-box 2 which defines the bottom of cavity 3 in a manner that any water which may be present inside cavity 3 slides towards the drainage hole due to gravity. It is important to note that the drainage hole must be wide enough to allow the water to flow downwards due to gravity, i.e. outside cavity 3 of air-box 2, but must also be small enough to reduce to the necessary minimum any loss of pressure which the drainage hole generates in cavity 3.
According to a preferred embodiment show in Figure 7, in each filter 6, end member 8 is surrounded by a support frame 24 which presents the same shape and dimensions of the transverse section of cavity 3 in correspondence to said minor lateral walls 15; in this manner, support frame 24 "fits" perfectly inside cavity 3 by leaning all of its sides against walls 13, 16 and 17 of air-box 2 and therefore guarantees an optimal mechanical connection between filter 6 and air-box 2. For each filter 6, walls 13, 16 and/or 17 of air-box 2 could present slots which define housing inside which frame 24 is arranged. Also, lid 17 could press from above onto support frames 24 of filters 6 (possibly with a small elastic deformation) to increase the force of the mechanical connection between filters 6 and air-box 2. In order to clean said filters 6, the operator simply has to remove lid 17 (unscrewing the corresponding screws) and then vertically raise said two filters 6 from air-box 2; it is therefore clear that maintenance and cleaning of filtering device 1 is extremely simple.
Filtering device 1 as described above presents numerous advantages .
In the first place, filtering device 1 described above is easy and inexpensive to manufacture and allows rapid replacement of said filters 6 once lid 7 is opened.
The inlet chamber is also limited to the internal volumes of said two filters 6, whilst the remainder of cavity 3 forms the outlet chamber; the inlet chamber therefore presents an extremely limited volume in favour of the outlet chamber. In other words, almost the entire volume of cavity 3 is formed of the outlet chamber which therefore presents an extremely large volume; in this manner, the outlet chamber efficiently performs its function as an expansion box of the suction system by storing a sufficiently high quantity of filtered air to absorb any fluctuations in the quantity of air sucked in by the suction system.
Filtering device 1 described above also presents a high mechanical sturdiness (which allows the mechanical stress present in the engine well of the vehicle to be easily sustained) and a simple and rapid disassembly to extract said two filters 6 (an operation necessary for periodic cleaning of filtering material 7) . This result is essentially obtained thanks to inner wall 19 divided into said two portions 21 and 22 which clamp said two end members 9 between them.
In conclusion, with the same total volume of air-box 2, filtering device 1 described above presents a total free area of flow of said filters 6 which is decidedly larger than a similar traditional filtering device provided with a single flat filter; in this manner, filtering device 1 described above presents a limited loss of load (i.e. a difference in pressure between the air upstream and downstream of said filters 6) and therefore allows the engine to supply a higher maximum power.

Claims

1) A filtering device (1) for the air sucked in by an engine; said filtering device (1) comprising:
a parallelepiped- shaped air-box (2) , which defines in its inside a cavity (3) and presents two inlet openings (4) towards the outside and two outlet openings (5) towards a suction system of the engine; and
two filters (6) , each of which is housed inside the air-box (2) , is arranged between an inlet opening (4) and an outlet opening (5) , and comprises in turn:
a filtering material (7) with tubular shape;
a first end member (8), which closes a first end of the filtering material (7) and presents a central through hole (10) arranged in correspondence to the inlet opening (4) , so as to allow the air to flow directly inside the filter (6) ; and
a second end member (9) , which closes 1 a second end of filtering material (7) opposite to the first end and presents no openings;
the filtering device (1) is characterised in that:
said two inlet openings (4) are obtained through two minor lateral walls (14) of air-box (2), which are parallel and opposite to each other, so as to face each other and be coaxial;
said two outlet openings (5) are envisaged side by side through a same major lateral wall (16) of air-box (2) , which connects said two minor lateral walls (15) to each other and is perpendicular to said minor lateral walls (15) ; and
said two filters (6) are arranged coaxial to each other, one after the other, and are centrally joined to each other in correspondence to said two second end members (9) , which are rigidly connected to each other in an inseparable manner. 2) The filtering device (1) according to , claim 1 and comprising an inner wall (19) , which is parallel to said minor lateral walls (15) of the air-box (2) and centrally divides the cavity (3) into two mirror-like half-cavities , each of which , contains a corresponding filter (6), communicates with the outside through a corresponding inlet opening (4), and communicates with the suction system of the engine through a corresponding outlet opening (5) .
3) The filtering device (1) according to claim 2, wherein the inner wall (19) is connected to the walls (13, 16) of the air- box (2) in an inseparable manner.
4) The filtering device (1) according to claim 2 or 3, wherein the inner wall (19) presents a central through hole (20) , through which the two second end members (9) of the filters (6) are arranged..
5) The filtering device (1) according to claim 4, wherein an elastic ring (23) is interposed between the central through hole (20) of the inner wall (19) and the two second end members (9) of the filters (6) .
6) The filtering device (1) according to claim 5, wherein the elastic ring (23) is externally arranged around the two second end members (9) of the filters (6) .
7) The filtering device (1) according to any of the claims from 2 to 6 , wherein:
the air-box (2) is cup-shaped and comprises a lower wall (13), four lateral walls (15, 16) extending perpendicular to the lower wall (13) , and an open upper end, which is closed by a removable lid (17) ; and
the inner wall (19) is divided into a lower portion (21) , which projects upwards from the lower wall (13) of the air-box (2) , and an upper portion (22) , which projects downwards from the lid (17) . 8) The filtering device (1) according to claim 7, wherein:
the lower portion (21) of the inner wall (19) extends, without gaps, between the two major lateral walls (16) of the air-box
(2) ; and
the upper portion (22) of the, inner wall (19) present a transverse dimension that is smaller than the transverse dimension of the cavity (3) of the air-box (2) measured between the two major lateral walls (16) . 9) The filtering device (1) according to claim 7 or 8, wherein an upper edge of the lower portion (21) of the inner wall (19) does not touch and, thus, is arranged at a certain distance from a lower edge of the upper portion (22). 10) The filtering device (1) according to. any of the claims from 2 to 9, wherein the inner wall (19) presents a free communication opening establishing a free communication -between the two half-cavities divided by the inner wall (19) . 11) The filtering device (1) according to any of the claims from 1 to 10, wherein, in each filter (6), the end member (8) is surrounded by a suppor frame (24) , which presents the same shape and dimension of the transverse section of the cavity
(3) in correspondence to the minor lateral walls (15) ,- in this way, the support frame (24) "fits" into the cavity (3) by leaning all of its sides against the walls (13, 16, 17) of the air-box (2) .
EP13705563.8A 2012-01-05 2013-01-04 Filtering device with double tubular filter for the air sucked in by an engine Active EP2800894B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000007A ITBO20120007A1 (en) 2012-01-05 2012-01-05 FILTERING DEVICE WITH DOUBLE TUBULAR FILTER FOR AIR INTAKE FROM A MOTOR
PCT/IB2013/050102 WO2013102888A1 (en) 2012-01-05 2013-01-04 Filtering device with double tubular filter for the air sucked in by an engine

Publications (2)

Publication Number Publication Date
EP2800894A1 true EP2800894A1 (en) 2014-11-12
EP2800894B1 EP2800894B1 (en) 2015-12-23

Family

ID=45809405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13705563.8A Active EP2800894B1 (en) 2012-01-05 2013-01-04 Filtering device with double tubular filter for the air sucked in by an engine

Country Status (3)

Country Link
EP (1) EP2800894B1 (en)
IT (1) ITBO20120007A1 (en)
WO (1) WO2013102888A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108472568B (en) 2015-12-17 2021-03-05 沃尔沃卡车集团 Filter element comprising an inclined end plate and corresponding filter housing
IT201800006072A1 (en) * 2018-06-06 2019-12-06 AIR FILTRATION DEVICE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021728A1 (en) * 2004-04-30 2005-11-24 Dr.Ing.H.C. F. Porsche Ag Air filter cartridge for an air intake system of an internal combustion engine
ATE541119T1 (en) * 2004-07-29 2012-01-15 Jui-Fa Huang HIGH FLOW VERTICAL AIR CLEANER WITH TWO-WAY AIR INLET
DE102007020456B4 (en) * 2007-04-27 2016-10-06 Audi Ag Filter element for an air filter of an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013102888A1 *

Also Published As

Publication number Publication date
ITBO20120007A1 (en) 2013-07-06
EP2800894B1 (en) 2015-12-23
WO2013102888A1 (en) 2013-07-11

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