JP2010281253A - Intake device of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device of an engine reducing the exhaust amount of harmful substances including nitrogen oxides exhausted from an engine. <P>SOLUTION: The intake device of an engine includes an intake duct 20 having an intake passage 24 for guiding air sucked from an intake port 22. In the intake passage 24, blades 25 are provided at positions where they can contact an air flow sucked from the intake port 22. The blades are covered with a photocatalyst 26 which is irradiated with light to cause the effects of oxidative decomposition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an intake device for an engine that cleans air taken from an intake port of an intake duct and introduces the air into an engine.

  The intake device as described above is generally configured to include an intake duct, an air cleaner, and the like, and is provided in an intake system of a vehicle engine, for example, and takes in air from the intake port and removes fine dust and dust therein. After being removed and cleaned, it is supplied to the engine. In the engine, the mixture of the purified air and the fuel injected by the injector is supplied from the intake port to the combustion chamber, compressed by the piston, ignited by the spark plug, and explosively burned. Energy for rotating the crankshaft, and then exhausted as exhaust gas from the exhaust pipe. On the other hand, exhaust gases emitted from such vehicle engines contain nitrogen oxides (NOx), which are harmful components, and exhausted from the engine due to increased concern about air pollution caused by nitrogen oxides. Various techniques for reducing the amount of nitrogen oxide produced have been proposed (see, for example, Patent Document 1).

JP-A-8-158952

Incidentally, in recent years, photocatalytic technology has attracted attention as a processing technology for removing harmful substances such as nitrogen oxides contained in air at room temperature. This treatment technology uses titanium dioxide (TiO ₂ ) or the like as a photocatalyst and irradiates the photocatalyst with ultraviolet light having a wavelength of 400 nm or less to generate active oxygen, which decomposes the active oxygen by a very strong oxidizing action. Is used to oxidatively decompose and remove nitrogen oxides and the like in the air. By using this photocatalytic technology, it is desired to reduce the amount of harmful substances such as nitrogen oxides discharged from the engine. One of them is the development of the engine intake system. Yes.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an engine air intake device capable of reducing the discharge amount of harmful substances such as nitrogen oxides discharged from the engine. To do.

  In order to solve the above problems, an intake device for an engine according to the present invention is an intake device for an engine including an intake duct formed with an intake passage that guides air sucked from an intake port to the engine. The substrate (for example, the blade plate 25 in the embodiment) coated with a photocatalyst that undergoes an oxidative decomposition action when irradiated with light is provided at a position where it can come into contact with the air flow sucked from the intake port. Configured as follows.

  In the above-described engine intake device, it is preferable that at least a part of the intake duct is formed using a light-transmitting material.

  Moreover, it is preferable to further comprise a light source capable of irradiating light for exciting the photocatalyst in the intake passage of the intake duct or outside the intake duct.

  Further, it is preferable that the base body is composed of a plurality of plate bodies that are inclined at a predetermined angle with respect to the air flow direction of the intake passage and are arranged at intervals at which air from the intake port can flow.

  The air cleaner further includes an air cleaner that communicates with the outlet of the intake passage of the intake duct and cleans the air sent from the intake duct and introduces the air into the engine. The air cleaner includes an accommodation space (for example, the element accommodation space S1 in the embodiment). ) And an inflow hole (for example, the inlet 51 in the embodiment) that communicates between the housing space and the outlet of the intake passage, and an outflow hole (for example, the outlet 52 in the embodiment) that communicates with the intake pipe of the engine. And a filter element that is detachably mounted in the housing space, and is configured to allow the air introduced from the inflow hole to pass through the filter element and to flow out to the outflow hole. The filter element is irradiated with light. It is preferable that the photocatalyst which produces an oxidative decomposition action is coated.

  Furthermore, it is preferable that at least a part of the cleaner case is formed using a light transmissive material.

  Moreover, it is preferable to further comprise a light source capable of irradiating predetermined light for exciting the photocatalyst covered with the filter element in the cleaner case housing space or outside the cleaner case.

  According to the engine intake device of the present invention, when light (sunlight or the like) is irradiated to the photocatalyst that has passed through the intake duct and is coated on the base, air taken into the intake duct from the intake port is taken into the intake passage. When the gas is circulated, nitrogen oxides and the like, which are harmful substances contained in the air, are oxidatively decomposed and removed by the action of the photocatalyst that has been irradiated with light. Therefore, since nitrogen oxides and the like contained in the air are largely removed at the stage of the intake path by the intake device, it is possible to effectively reduce the emission amount of nitrogen oxides and the like contained in the exhaust gas from the engine. it can.

  Since at least a part of the air intake duct can transmit light, sunlight can be efficiently used, and thus energy saving can be realized.

  In addition, by further comprising a light source capable of irradiating predetermined light for exciting the photocatalyst, the photocatalyst can always be excited regardless of day or night, and the weather, so that the action of the photocatalyst is more effective. This makes it possible to increase the removal amount of nitrogen oxides and the like.

  Further, the substrate is introduced from the intake port by being configured by a plurality of plates that are inclined at a predetermined angle with respect to the air flow direction of the intake passage and are arranged at intervals through which air from the intake port can flow. Air can be smoothly circulated in the intake passage. For this reason, the engine load is reduced and the engine load is reduced by removing the nitrogen oxide contained in the intake air while preventing the pressure loss of the intake air (reducing the intake resistance) and securing a sufficient intake air amount. It is possible to perform well

  In addition, the filter element of the air cleaner connected to the intake duct is covered with a photocatalyst that generates oxidative decomposition when irradiated with predetermined light, so that the nitrogen oxidation that could not be captured by the photocatalyst in the intake duct Objects and the like can be removed by the action of the photocatalyst coated on the filter element. Therefore, the emission amount of nitrogen oxides from the engine can be further reduced by the two-stage photocatalytic action of the intake duct and the air cleaner.

  Further, since at least a part of the cleaner case can transmit light, sunlight can be used efficiently, so that the energy saving effect can be further improved.

  In addition, since the photocatalyst can be always excited regardless of the day or night, and by being configured to include a light source capable of irradiating predetermined light that excites the photocatalyst coated on the filter element, It becomes possible to use the action more effectively.

It is a side view showing a truck to which an air intake device according to an embodiment of the present invention is applied. It is a side view which shows the said intake device. It is a principal part cross-sectional side view of the intake duct which comprises a part of said intake device. It is side surface sectional drawing which shows the air cleaner which comprises some said intake devices. It is a partial cross section side view of a filter element. It is a principal part cross-sectional side view of the intake duct of other embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a cab over type truck provided with an intake device according to the present embodiment, FIG. 2 is a side view of the intake device, FIG. 3 is a cross-sectional view of a main part of an intake duct, and FIG. 4 is a side cross-sectional view of an air cleaner. FIG. 5 is a side view of the filter element.

  As shown in FIG. 1, the truck 1 can run with wheels 4 (only the front right wheel is shown in FIG. 1) arranged before and after the chassis frame 2, and has a driving cab 3 at the front. An engine 5 is mounted on the chassis frame 2 below the driving cab 3. The driving cab 3 can be tilted up, that is, can be lifted upward with the front lower end portion of the driving cab 3 as a center so that maintenance and inspection of the engine 5 is easy. On the back side of the driving cab 3, there is provided an intake device 10 that introduces outside air from the intake port 22 and introduces air purified by an air cleaner 50 into the engine 5.

  The intake device 10 is connected to the intake duct 20 by an intake duct (snorkel duct) 20 that is fixed in a standing posture by screw fastening to a rear left corner portion of the cab 3 via a bracket 29 and the like, and a bellows-like connector 31. The air box 40 and the air cleaner 50 attached to the chassis frame 2 and connected to the air box 40 by a bellows-like hose 32 are mainly configured.

  The intake duct 20 is integrally molded in a flat chimney shape using a light transmissive resin (ultraviolet light transmissive resin), and is formed above the duct body 21 extending substantially vertically along the back surface of the driving cab 3. Is formed with an intake port 22 (as an air intake port) opened in a substantially rectangular shape. A plurality of blind-shaped louvers 23 that prevent rainwater from entering the duct body 21 at the air inlet 22 of the duct body 21 have an upward slope at equal intervals in the vertical direction and toward the inside of the duct body 21. They are arranged side by side with such an inclination. As the light transmissive resin, for example, a light transmissive acrylic resin or fluorine resin is used.

  The duct body 21 has an intake passage 24 (as an air passage) that guides outside air that is surrounded by the inner wall portion 21a and is taken in from the intake port 22 to the air box 40 via the connector 31. 24, a plurality of substantially rectangular flat blades 25 are arranged in parallel to each other.

  The vane plate 25 is formed in a substantially rectangular flat plate shape using a material such as polypropylene (PP), for example, and has an upward slope toward the central axis in the vertical direction and is equally spaced in the vertical direction on the inner wall portion 21a. The plurality of blades 25a attached and the plurality of blades 25b attached to the inner wall portion 21a at equal intervals in the vertical direction with an inclination in the downward direction toward the central axis in the vertical direction are alternately shifted. Has been placed. The blade plate 25 may be formed of a ceramic plate, an aluminum plate, a stainless plate, a silica plate, or the like.

The surface portion of each blade 25 is coated with titanium dioxide (TiO ₂ ) as a photocatalyst 26. The photocatalyst 26 generates active oxygen when exposed to light (ultraviolet light of 400 nm or less), and nitrogen oxides NOx and the like, which are harmful substances contained in the gas, are harmless by the strong decomposition action of the active oxygen. It has a function of decomposing into NO ₃ ⁻ ). Further, in the photocatalyst 26, an inorganic amorphous titanium peroxide (TiO ₃ ) having no photocatalytic function as an undercoat layer is coated between the titanium dioxide having a photocatalytic function and the substrate (blade plate 25). It has a two-layer structure of titanium peroxide (first layer) and titanium dioxide (second layer). Thereby, titanium dioxide can be securely adhered to the base body (blade plate 25) by the strong adhesive force of titanium peroxide itself, and photocatalyst by titanium dioxide is applied to the vane plate 25 made of PP which is an organic material. Since the action (oxidative decomposition action) can be blocked, the surface of the blade plate 25 is prevented from being damaged.

At this time, each vane plate 25 is disposed in the intake duct 20 with an inclination of an upward or downward gradient toward the vertical center axis, so that the airflow flowing down in the intake duct 20 is reduced. Thus, the air flow is brought into contact with the photocatalyst 26 (surface portion of the blade plate 25) in a wide range while suppressing pressure loss (intake resistance). For this reason, when light (sunlight) is irradiated to the photocatalyst 26 (titanium dioxide layer) that is transmitted through the inner wall portion 21a of the intake duct 20 and supported on each blade plate 25, the outside air taken into the intake duct 20 is exposed. The nitrogen oxides NOx and the like contained in the outside air are oxidatively decomposed by the action of the photocatalyst 26 irradiated with light, while flowing down in the intake duct 20 while being guided obliquely downward by the blades 25 sequentially. Ultimately, it is decomposed into nitrate ions (NO ₃ ⁻ ). Thereby, it becomes possible to actively decompose nitrogen oxides NOx and the like in the outside air taken into the intake duct 20, and nitrogen oxides NOx and the like can be effectively removed.

  The lower end of the intake duct 20 is fitted into the upper end of the connector 31, and the air inlet 41 of the air box 40 is fitted into the lower end of the connector 31, and is tightened by the hose band 33 from the outer peripheral side of the connector 31. Thus, the intake duct 20 and the air box 40 are connected via the connector 31 so that they are communicated with each other.

  On the other hand, an air outlet (not shown) of the air box 40 is connected to one end of the hose 32, and an inlet (intake inlet) 51 of the air cleaner 50 is connected to the other end of the hose 32. And the air cleaner 50 are connected to each other by a hose 32, and when air flows into the air box 40 from the intake duct 20, the moisture in the air taken in is separated by the moisture separating action by the air box 40. Therefore, the amount of moisture in the air carried to the air cleaner 50 via the hose 32 is greatly reduced.

  As shown in FIG. 4, the air cleaner 50 is mainly composed of a cleaner case 60 and a cylindrical filter element 70 accommodated and held in the cleaner case 60. Here, the cleaner case 60 is partially or entirely formed of a case main body 61 formed using a light transmitting resin (ultraviolet light transmitting resin), and a clamp mechanism (not shown) is used at the lower end of the case main body 61. And a case cover 62 that is detachably attached. As the light transmissive resin, for example, a light transmissive acrylic resin or fluorine resin is used.

  The case main body 61 of the cleaner case 60 has a central portion formed in a vertically long cylindrical shape, and an element accommodating space S1 for detachably accommodating the filter element 70 is formed therein. A circular upper opening 61a is formed at the center of the upper end of the case main body 61 that defines the element accommodating space S1, and a cylindrical communication pipe 63 extends downward from the upper opening 61a. . A cylindrical outlet 52, which is an air outlet, is further connected to the upper opening 61a of the case main body 61 so as to extend substantially horizontally, whereby the communication pipe 63 and the outlet 52 are communicated with each other.

  Further, a side opening 61b is formed on the inner side wall that divides the element accommodating space S1, and a cylindrical inlet 51 serving as an air inlet extends from the side opening 61b so as to extend substantially horizontally. Yes. As a result, the air flowing in from the inlet 51 is introduced into the cleaner case 60 (in the element accommodating space S1) from the side opening 61b.

The filter element 70 is attached so that a filter medium 72 made of a non-woven fabric (for example, polyester) folded in a bellows shape is wound around the outer periphery of a base (inner tube) 71 made of a cylindrical shell in which a large number of circular holes 71a are formed. The lower end is held by disk-shaped fixing caps 73 and 74. The surface of the filter medium 72 is coated with titanium dioxide (TiO ₂ ) as the photocatalyst 53, and further, titanium peroxide (TiO ₃ ) is coated as an undercoat layer between the titanium dioxide and the substrate (filter medium 72). Like the photocatalyst of the vane plate 25 described above, it has a two-layer structure. For this reason, when sunlight is irradiated to the photocatalyst 53 (titanium dioxide layer) of the filter medium 72 through the case body 61, the air introduced from the inlet 51 flows around the outer periphery of the filter medium 72, or the filter medium 72 At the timing of passing (filtering) from the surface to the inside of the base 71, the nitrogen oxides NOx and the like contained in the air are photocatalyzed and oxidatively decomposed, and finally decomposed into nitrate ions (NO ₃ ⁻ ). Is done. As a result, since nitrogen oxides NOx and the like, which are harmful substances in the air introduced into the air cleaner 50, can be actively decomposed, the photocatalyst 26 carried on the plurality of blades 25 in the intake duct 20 Nitrogen oxide NOx or the like that could not be captured can be removed by the photocatalyst 53 supported on the filter medium 72. For this reason, in the intake device 10, the two-stage photocatalytic action of the intake duct 20 and the air cleaner 50 can be exerted on the taken-out outside air. The filter medium 72 may be formed using filter paper made of pulp or the like.

  An air discharge hole 73a made of a circular hole having an inner circumference slightly larger than the outer periphery of the base 71 is provided in the center portion of the upper fixing cap 73. The air discharge hole 73a opens outward in the upward direction. A substantially cylindrical sealing member 75 having a conical lip portion 75a is attached.

  Further, the lower fixing cap 74 has a disk shape formed in accordance with the shape of the bottom surface of the filter medium 72 wound around the outer periphery of the base 71, and has an inner diameter that is approximately the same as the inner diameter of the base 71 at the center. An opening 74a is formed. Therefore, in order to prevent the air in the element accommodating space S1 from entering the filter element 70 (base 71) through the opening 74a of the lower fixing cap 74 without being filtered and cleaned by the filter medium 72, the lower surface of the lower fixing cap 74 is used. On the side, a trapezoidal ring-shaped lower seal 76 is integrally provided. At the same time, a ring-shaped receiving groove 81 having a trapezoidal cross section is provided on the bottom surface of the dust cover 80 that holds the lower end of the filter element 70, and the lower seal 76 is received in the receiving groove 81. The opening 74a of the lower fixing cap 74 is sealed with respect to the element accommodating space S1.

  The filter element 70 is inserted and attached from the opening (lower part) of the case body 61 in a state where the lower end portion is held by the cylindrical dish-shaped dust cover 80 opened upward, and the dust cover 80 is further held from below. A cylindrical dish-shaped case cover 62 opened upward is attached to the lower portion of the case body 61.

  Thus, when the filter element 70 is mounted in the element accommodating space S <b> 1, the above-described communication pipe 63 formed to extend downward from the upper wall of the case body 61 is attached to the upper portion of the filter element 70. From the opening 75b. When the filter element 70 is completely installed in the case main body 61, the lip portion 75a of the seal member 75 is pressed against the upper wall of the case main body 61 from below to open outward, and the air in the conical portion becomes negative pressure. Thus, the lip portion 75a is in close contact with the upper wall of the case body 61. As a result, the base 71 of the filter element 70 and the communication pipe 63 are sealed, and the filter element 70 passes through the filter medium 72 and reaches the base 71 to be cleaned (dust and dust are removed). The air flows through the communication pipe 63 to the outlet 52 efficiently.

  The outlet 52 is connected to an intake pipe (not shown) of the engine 5, and the purified air from which dust, dust, harmful substances such as nitrogen oxides NOx are removed by the air cleaner 50 passes through the intake pipe of the engine 5. It is introduced into the engine 5 through.

Next, the operation of the engine intake device 10 configured as described above will be described. When the engine 5 is driven in the truck 1, air is taken into the duct body 21 from the intake port 22 of the intake duct 20 by the suction action of the air cleaner 50, and a plurality of introduced air is disposed in the duct body 21. It flows down while being guided obliquely downward while the flow is changed by the plate 25. At this time, when light (sunlight) is irradiated to the photocatalyst 26 that passes through the duct main body 21 and is carried on the surface of each blade 25, the air that flows in the duct main body 21 due to the oxidative decomposition action of the photocatalyst 26. Nitrogen oxides NOx and the like contained in are decomposed into harmless nitrate ions (NO ₃ ⁻ ) and removed.

  The air that is discharged from the intake duct 20 and flows through the internal passage in the order of the connector 31, the air box 40, and the hose 32 is dehydrated by the air box 40, and enters the air cleaner 50 from the inlet 51 connected to the hose 32. To be introduced. The air flowing in from the inlet 51 flows around the outer periphery of the filter element 70 in the case body 61 and passes through the filter medium 72 of the filter element 70 in the direction from the outer peripheral portion toward the inner peripheral portion. Foreign matter such as dirt and dust is filtered by the filter medium 72.

At this time, when light (sunlight) is irradiated to the photocatalyst 53 that passes through the case main body 61 of the cleaner case 60 and is supported on the surface of the filter medium 72, the filter medium 72 is oxidized by the photocatalyst 53. Nitrogen oxide NOx and the like contained in the air flowing through the outer periphery of the filter medium 72 and the air passing through the filter medium 72 (nitrogen oxide NOx etc. that could not be removed by the photocatalyst 26 of the blade 25) are harmless nitrate ions (NO _3). ^-) it is removed by decomposition to a. Thus, the outside air taken in from the intake port 22 of the intake duct 20 is generated by the photocatalyst 26 carried on the plurality of blades 25 in the intake duct 20 and the photocatalyst 53 carried on the filter medium 72 of the air cleaner 50 2. By receiving the photocatalytic action in stages, when exhausted from the air cleaner 50, it becomes purified air from which nitrogen oxides NOx and the like, which are harmful substances contained in the air, are significantly removed.

  Then, the purified air that has passed through the filter medium 72 and reached the internal space of the base 71 is discharged from the outlet 52 to the outside of the air cleaner 50 through the communication pipe 63 communicating with the internal space of the base 71. That is, the air purified by the intake device 10 is introduced from the outlet 52 into the engine 5 through the intake pipe (intake system) of the engine 5.

  In the engine 5, a mixture of air cleaned and sent by the intake device 10 and fuel injected from an injector (not shown) is supplied to a combustion chamber (not shown) and compressed in the combustion chamber. It is ignited later and explodes and combusted, and then exhausted from the exhaust pipe (not shown) to the outside of the truck 1 as exhaust gas.

  At this time, the intake device 10 removes nitrogen oxides NOx and the like contained in the intake air while preventing a pressure loss of the introduced air (reducing intake resistance) and ensuring a sufficient intake air amount. As a result, the engine load can be reduced and the engine performance can be satisfactorily exhibited, and at the stage of the intake path in the intake device 10, nitrogen oxide NOx and the like contained in the air can be significantly removed. It becomes possible to greatly reduce the emission amount of harmful substances (nitrogen oxide NOx and the like) contained in the exhaust gas.

  Therefore, according to the intake device 10 according to the present embodiment, it is possible to obtain an effective removal effect of harmful substances (nitrogen oxide NOx and the like).

Although the preferred embodiments of the present invention have been described so far, the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, titanium dioxide (TiO ₂ ) is used as the photocatalyst, but the present invention is not limited to this, and tin oxide (SnO ₂ ) or the like may be used as the photocatalyst. Moreover, in the above-mentioned embodiment, it was configured to have a two-layer structure in which titanium peroxide was coated as an undercoat layer between the base (blade plate 25, filter medium 72) and titanium oxide. However, the present invention is not limited to this, and a single-layer structure in which only titanium oxide is coated may be used. In particular, when the substrate on which the photocatalyst is coated is made of an organic material, it is preferably formed as a two-layer structure as exemplified above. On the other hand, when the substrate is made of an inorganic material, for example, a titanium oxide layer Only a single layer structure may be used.

  Moreover, in the above-mentioned embodiment, the oxidative decomposition action was obtained by irradiating the photocatalyst with sunlight. However, the present invention is not limited to this. For example, as shown in FIG. A light source 90 that promotes oxidative decomposition by a photocatalyst such as black light may be provided. At this time, the light source can be arranged regardless of the inside or outside of the intake duct 20 or the air cleaner 50 as long as the light source can irradiate the photocatalyst.

  Furthermore, in the above-described embodiment, each vane plate 25 in the intake duct 20 is arranged on the inner wall portion 21a in parallel and alternately in the vertical direction. However, the present invention is not limited to this. The blades may be arranged in a spiral shape at a predetermined interval along the inner wall portion 21a of the material 21. Further, the shape of the blade plate may be formed in a ring shape, a spiral shape, or the like.

  In the above-described embodiment, the photocatalyst (titanium dioxide) is coated on the surface of the blade plate 25 and the surface of the filter medium 72. However, the present invention is not limited to this, and the inner wall portion of the duct body 21 is not limited thereto. 21a and the inner wall portion of the case body 61 may be further coated.

DESCRIPTION OF SYMBOLS 1 Truck 5 Engine 10 Intake device 20 Intake duct 22 Inlet 24 Intake passage 25 Blade | blade board (base | substrate, plate body)
26 Photocatalyst 50 Air cleaner 51 Inlet (inlet)
52 Outlet
53 Photocatalyst 60 Cleaner case 70 Filter element 90 Light source S1 Element accommodation space (accommodation space)

Claims (7)

An intake system for an engine comprising an intake duct formed with an intake passage that guides air sucked from an intake port to the engine,
In the intake passage, a substrate coated with a photocatalyst that generates an oxidative decomposition action when irradiated with light is provided at a position where the substrate can come into contact with the air flow sucked from the intake port. The engine intake system.   The engine intake device according to claim 1, wherein at least a part of the intake duct is formed using a light-transmitting material.   The engine according to claim 1, further comprising a light source capable of irradiating light for exciting the photocatalyst in the intake passage of the intake duct or outside the intake duct. Intake device.   The base body is composed of a plurality of plates inclined at a predetermined angle with respect to an air flow direction of the intake passage and arranged in rows at intervals through which air from the intake port can flow. The engine intake device according to any one of 1 to 3. An air cleaner that communicates with an outlet of the intake passage of the intake duct and cleans the air sent from the intake duct and introduces it into the engine;
The air cleaner has a housing space inside, a cleaner case having an inflow hole communicating with the housing space and an outlet of the intake passage, and an outflow hole communicating with the intake pipe of the engine, and a removable case in the housing space. A filter element that is freely mounted, and is configured to allow the air introduced from the inflow hole to flow through the filter element and outflow into the outflow hole,
The engine intake device according to any one of claims 1 to 4, wherein the filter element is coated with a photocatalyst that generates an oxidative decomposition action when irradiated with light.   6. The engine intake device according to claim 5, wherein at least a part of the cleaner case is formed of a light transmissive material.   The light source capable of irradiating light that excites the photocatalyst covered by the filter element in the accommodating space of the cleaner case or outside the cleaner case is further provided. Or an intake device for an engine according to 6;

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