JP3938561B2 - Air cleaner - Google Patents

Description

  The present invention relates to an air cleaner having a drain portion for draining water in an air cleaner, and the air cleaner is used in, for example, an internal combustion engine for a vehicle.

As an air cleaner which has a drain part, what was indicated by patent documents 1, for example is known. In this air cleaner, on the bottom wall of the air cleaner case, a protruding portion is formed integrally from the inner surface of the bottom wall, and an annular protruding wall is integrally formed on the outer surface of the bottom wall, and one opening end of the drain hole is the outer periphery of the protruding portion. The other opening end of the drain hole is opened facing the internal space of the annular projecting wall.
JP-A-11-294272

By the way, in the prior art, since the inlet of the drainage hole (corresponding to the one open end) faces a specific side and opens to the outer peripheral surface of the protruding portion, external water intrusion from the drainage hole is prevented. Although prevented, the water in the air cleaner heading from the side other than the specific side to the drain hole is blocked by the protrusion. Therefore, a good drainage of water in the air cleaner, yet that water barrier inhibiting the spread of water to or penetrated preventing external water intrusion is to be good, provided in the air cleaner It was difficult to realize with a simple structure.

  Moreover, since the protrusion part in which the drain hole is formed is integrally formed with the air cleaner case, the arrangement of the drain hole may be restricted from the viewpoint of ease of molding such as die cutting. Further, as described above, the drain hole entrance faces a specific side and opens to the outer peripheral surface of the protruding portion. Therefore, in order to improve drainage, the entire circumferential direction of the protruding portion is directed from the protruding portion to the protruding portion. In this respect, the arrangement of the drain holes is also limited.

This invention is made | formed in view of such a situation, and the invention of Claim 1 to Claim 3 enlarges the freedom degree of arrangement | positioning of a drain hole in the drain part provided in an air cleaner. At the same time, it aims to improve drainage efficiency of water flowing down the inner surface of the peripheral wall of the air cleaner. The invention according to claim 3 further aims to ensure good drainage and good water shielding properties with a simple structure.

The invention according to claim 1 is an air cleaner that includes a case that forms an air chamber, and a drain hole for discharging water in the air chamber to the outside. The case includes a bottom wall, the bottom A circumferential wall extending upward from the wall, and an inner surface of the circumferential wall is provided with a stepped portion having an annular step surface in plan view, and the stepped portion opens upward. And an annular groove extending along the inner surface is formed, and the drainage hole is formed by a part of the annular groove and is provided in a collecting portion where water flowing into the annular groove gathers, and the bottom surface of the annular groove is The bottom surface of the collecting portion where the inlet of the drain hole is opened is formed at the lowermost portion, and the collecting portion is formed in a portion having an inner surface on which the main flow of air flowing into the air chamber hits the peripheral wall. Provided in the stepped portion, Serial section is a cleaner that make up the side walls of the collecting portion.

According to a second aspect of the present invention, in the air cleaner of the first aspect, the air chamber is divided into a first chamber and a second chamber by a partition member, and an outer side wall of the annular groove is configured by the peripheral wall, and the annular The inner side wall of the groove is constituted by a holding portion made of an annular ridge on which the partition member is placed.

According to a third aspect of the present invention, there is provided an air cleaner comprising a case that forms an air chamber, wherein the case is provided with a drain hole for discharging water in the air chamber to the outside. The case includes a bottom wall, the bottom A circumferential wall extending upward from the wall, and an inner surface of the circumferential wall is provided with a stepped portion having an annular step surface in plan view, and the stepped portion opens upward. And an annular groove extending along the inner surface is formed, and the drainage hole is formed by a part of the annular groove and is provided in a collecting portion where water flowing into the annular groove gathers, and the bottom surface of the annular groove is The bottom surface of the collecting portion where the inlet of the drain hole is opened is the lowermost portion, the air chamber is divided into a first chamber and a second chamber by a partition member, and the side wall outside the annular groove Is constituted by the peripheral wall, and the inside of the annular groove The side walls, the partition member is constituted by the holding portion formed of an annular protrusion to be placed, water shielding portion that prevents the spread of water entering through the water drain hole from the outside, of the partition member It is a part, and is comprised by the plate-shaped protrusion part which protrudes so that the opening of the said gathering part may be covered from the said holding | maintenance part, and the said water-impervious part covers the said inlet in planar view, and goes upwards from the said inlet They are provided separately.

According to the first aspect of the present invention, the drain hole can be provided in the case where the annular groove can be formed, so that the degree of freedom of the arrangement of the drain hole in the air cleaner is increased.
In addition, since the bottom surface of the gathering portion where the inlet of the drain hole is formed is the lowermost part at the bottom surface of the annular groove, the water flowing down the inner surface of the peripheral wall and flowing into the annular groove is efficiently removed from the drain hole. Collecting at the entrance improves drainage efficiency.

Furthermore, the water drainage hole is provided on the bottom surface of the collecting portion having the peripheral wall portion as a side wall, so that the main flow of the air flowing into the air chamber hits the portion so that the moisture contained in the air is easily attached. Since the water flowing down the inner surface immediately flows into and is discharged from the collecting portion provided with the drain hole, the drainage efficiency of the water in the air cleaner is improved.

According to invention of Claim 3 , the following effect is show | played. That is, since the drain hole can be provided in the case where the annular groove can be formed, the degree of freedom in arranging the drain hole in the air cleaner is increased.
In addition, since the bottom surface of the gathering portion where the inlet of the drain hole is formed is the lowermost part at the bottom surface of the annular groove, the water flowing down the inner surface of the peripheral wall and flowing into the annular groove is efficiently removed from the drain hole. Collecting at the entrance improves drainage efficiency.
Furthermore, the water-impervious part prevents the water that has entered the drain hole from the outside from spreading inside the air cleaner, and the water in the air cleaner toward the inlet flows into the drain hole without being blocked by the impermeable part. Therefore, good drainage and good water shielding are ensured.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 and 2, an air cleaner A to which the present invention is applied is provided in an intake device of an internal combustion engine mounted on a vehicle.

  The air cleaner A is housed in the air chamber C and the first and second cases 1 and 2 that are air-tightly coupled to each other by the flange portions 1a and 2a to form an air chamber C through which air sucked from outside flows. And a cleaner element 3 that removes dust contained in the sucked air and cleans the air. The air chamber C is a dust chamber 4 which is an air chamber located on the upstream side of the intake air by the cleaner element 3 held between the flange portions 1a and 2a of both cases 1 and 2 and containing air before cleaning. And a clean chamber 5 which is an air chamber located on the downstream side of the intake air and where air after cleaning exists.

  The first and second cases 1 and 2 are detachably coupled by a plurality of clamps 6 for tightening both flange portions 1a and 2a. When the cleaner element 3 is replaced, the clamping of the clamp 6 is released. Thus, the first and second cases 1 and 2 are separated, and the cleaner element 3 is detached.

  The first case 1 is provided with a cylindrical inlet portion 7 (see FIG. 4) that protrudes outward from the first case 1. An inlet portion 7 that forms an inlet passage 7 a communicating with the dust chamber 4 is connected to an air introduction pipe 8 that takes in outside air. The second case 2 is provided with a cylindrical outlet portion 9 that protrudes outward from the second case 2. An outlet portion 9 that forms an outlet passage 9a that communicates with the clean chamber 5 is connected to an air outlet pipe 10 that guides clean air to the combustion chamber of the internal combustion engine.

  3 and 4, the air cleaner A includes a first resonator 11 integrated with the air cleaner A, and communicates with the clean chamber 5 with a second resonator 12 disposed outside the air cleaner 1. They are connected via a communication pipe 13. The first resonator 11 has a resonance chamber 4 b formed by the partition member 14 provided in the air cleaner A and the first case 1.

  Therefore, the partition member 14 partitions the dust chamber 4 into a main chamber 4a that is a first chamber and a resonance chamber 4b that is a second chamber, and a holding portion 20 provided on the inner surface Wa of the peripheral wall W of the first case 1. Airtightly coupled to. The partition member 14 forms a plate-like main body 15 constituting a partition wall between the main chamber 4a and the resonance chamber 4b, and a communication passage 16a that connects the inlet passage 7a (see FIG. 4) and the main chamber 4a. A communication pipe 16 and a communication pipe 17 for communicating the main chamber 4a and the resonance chamber 4b are provided.

  Here, the first and second cases 1 and 2 and the partition member 14 are all made of synthetic resin. The partition member 14 is integrally formed with both the communication pipes 16 and 17, and the entire outer peripheral edge portion 18 of the partition member 14 is attached to the holding portion 20 formed in the first case 1. At 20a, for example by ultrasonic welding.

  Therefore, when the internal combustion engine is operated, the air that flows into the dust chamber 4 from the air introduction pipe 8 through the inlet passage 7a and the communication passage 16a passes through the cleaner element 3 from the main chamber 4a and flows into the clean chamber 5. Then, after flowing out from the clean chamber 5 through the outlet passage 9a to the outlet pipe 10, the flow rate is controlled by, for example, a throttle valve (not shown), and then supplied to the combustion chamber of the internal combustion engine through an intake pipe such as an intake manifold. . At this time, the intake pulsation is attenuated by the first and second resonators 11 and 12, and the intake noise is reduced.

In the air cleaner A attached to the vehicle body via the bracket B (see FIG. 2), the front side portion Af where the inlet portion 7 is formed faces the front of the vehicle, and the rear side portion Ar where the outlet portion 9 is formed is the rear side of the vehicle. It is mounted on the vehicle with the side facing. In this mounted state, the first and second cases 1 and 2 are positioned at the lower and upper portions of the air cleaner A, and the inner surface 21a of the bottom wall 21 of the first case 1 that is also the bottom wall of the air cleaner A is substantially parallel to the horizontal plane. Thus, the main body 15 of the partition member 14 constitutes the bottom wall of the main chamber 4a and is inclined downward as it goes rearward (see FIG. 4). Accordingly, the first case 1 has the bottom wall 21 and the peripheral wall W, and the peripheral wall W extends upward from the bottom wall 21 as shown in FIG.

  Next, the structure of the drainage portions Da and Db will be described with reference to FIGS.

  3 and 4, the first case 1 forming the dust chamber 4 includes a first drain portion Da that discharges water in the main chamber 4a and a second drain that discharges water in the resonance chamber 4b. A drainage portion Db is provided. The first drainage portion Da located at the bottom of the main chamber 4a forming the upper portion of the dust chamber 4 is a groove as a collecting portion formed in the step portion 30 provided on the inner surface Wa of the peripheral wall W of the first case 1. E, a collecting portion 31 constituted by a part of the groove E and collecting water flowing into the groove E, and a drain hole 32 provided in the collecting portion 31 to communicate between the main chamber 4a and the outside of the air cleaner A, An inner impermeable portion 33 that is provided in the main chamber 4a and prevents the spread of water that has entered through the drain hole 32 from the outside, and water from the outside to the drain hole 32 that is provided on the outer surface Wb of the peripheral wall W. And an outer water-impervious portion 34 that prevents intrusion of the water.

  Referring also to FIG. 5, the groove E provided at an intermediate position between the bottom wall 21 that is the lower end portion of the first case 1 and the flange portion 1 a that is the upper end portion in the vertical direction is a plan view, that is, the vertical direction. When viewed from above, the step portion 30 having an annular upper surface (step surface) has an opening that opens upward and extends along the inner surface Wa of the peripheral wall W. The bottom surface Ea of the groove E (shown by shading in FIGS. 3 and 6) is an inclined surface composed of a plane inclined with respect to the horizontal plane so that the bottom surface 31a of the collecting portion 31 is the lowermost part, and It is inclined downward as it goes to. The outer side wall Ec of the groove E is constituted by the peripheral wall W of the first case 1, and the inner side wall Ed of the groove E is constituted by a holding portion 20 made of an annular ridge on which the main body 15 is placed. The holding portion 20 is formed with a welded portion 20a formed of an annular groove into which a welded portion 18a formed of an annular protrusion formed on the outer peripheral edge portion 18 of the partition member 14 is fitted. Moisture in the sucked air adheres to the inner surface Wa and flows into the groove E after flowing down the inner surface Wa as water droplets.

  Referring to FIGS. 5 to 7, the collective portion 31 that is the lowermost portion of the groove E is provided in a stepped portion 30 a formed on the rear side wall 35 that is a portion facing the rear of the peripheral wall W. A drain hole 32 comprising a through-hole penetrating the bottom wall 36 of the collecting portion 31 in the vertical direction is an inlet 32a that opens to the bottom surface 31a of the collecting portion 31 and a bottom wall that is also the lower surface (step surface) 30a1 of the stepped portion 30a. It has an outlet 32b that opens to the lower surface 36a of 36 (also the outer surface 35b of the rear side wall 35). The inlet 32a opened upward has a width h1 in the groove width direction substantially equal to the groove width at the bottom surface 31a of the collecting portion 31, and has a longer length than the width h1 along the longitudinal direction in the collecting portion 31. It has a width h2 in the direction. In this embodiment, the inlet 32a has a rectangular shape that is long in the longitudinal direction, and the cross section of the drain hole 32 has the same shape as the inlet 32a, including the outlet 32b that opens downward. Due to the cross-sectional shape of the drain hole 32, a drainage function for draining a required amount of drainage is ensured without increasing the groove width at the bottom surface 31a. Here, the outer side wall 31 c of the collecting portion 31 is constituted by the rear side wall 35, and the inner side wall 31 d of the collecting portion 31 is constituted by the portion 20 d of the holding portion 20 facing the rear side wall 35.

  The inner water-impervious portion 33 constituted by a member different from the first case 1 is a part of the partition member 14 and is constituted by a plate-like protrusion provided integrally with the outer peripheral edge portion 18. . The inner water-impervious portion 33 exits the collecting portion 31 (groove E) when outside water that has entered the collecting portion 31 from the inlet 32a through the drain hole 32 hits the inner impermeable portion 33, and enters the main chamber. In order to prevent further intrusion in 4a or expansion in main room 4a, it is provided at a position that covers entrance 32a in plan view and is spaced upward from entrance 32a. At this time, as shown in FIG. 5, the entire entrance 32 a is covered with the inner water-impervious portion 33 in a plan view. Here, the degree of separation between the inner water-impervious portion 33 and the inlet 32a, that is, the depth of the groove of the collective portion 31, is determined by the fact that external water that has entered the collective portion 31 from the drain hole 32 At this time, it is appropriately set so that it can be prevented from expanding in the main room 4a.

  The inner water-impervious portion 33 has a width h3 in the longitudinal direction that is larger than the width of the inlet 32a, and extends in the longitudinal direction beyond both ends 32a1 and 32a2 of the inlet 32a in the longitudinal direction in plan view ( (See FIG. 6). Further, as shown in FIG. 5, the inner water-impervious portion 33 protrudes along the opening so as to partially cover the opening of the collecting portion 31 from the upper surface of the holding portion 20, and the inner surface 35 a (the inner surface Wa of the rear side wall 35). The tip portion 33a opposite to the inner wall 35a of the rear side wall 35 is spaced from the inner surface 35a, and a gap 37 is formed between the tip portion 33a and the inner surface 35a.

  Furthermore, the upper surface 33b of the inner water-impervious portion 33 and the upper surface 18b of the outer peripheral edge portion 18 are inclined downward toward the inner surface 35a. The upper surface 33b is a lower portion formed lower than the upper surface 18b, and extends along the inner surface 35a or the gap 37.

  Further, since the inner surface 35a of the rear side wall 35 is subjected to the main flow F (see FIGS. 1, 3, and 4) of the air flowing into the main chamber 4a through the communication passage 16a, the moisture contained in the air is absorbed. The inner surface is easy to adhere.

Outer water barrier portion 34 includes a side wall 35 after the lower step portion 30, around the outlet 32b, the outer surface 35b of the rear side wall 35 so as to cover from the outside, toward the lower surface 3 0 a1 stepped portion 30a downward A hanging wall 38 that extends and has a U-shaped cross section (see FIG. 7) in plan view. The drooping wall 38 covers the rear side and the left and right side of the outlet 32b, and the outlet 32b opens to the lower surface 30a1 that is formed by the outer water shielding portion 34 and serves as a ceiling surface of the internal space 39 that opens downward.

  Referring to FIGS. 1, 3, and 4, the second drainage portion Db located near the center of the bottom portion of the resonance chamber 4 b that forms the lower portion of the dust chamber 4 moves the bottom wall 21 of the first case 1 in the vertical direction. The water drain hole 40 is formed so as to penetrate the resonance chamber 4b and communicate with the outside of the air cleaner A. The water drain hole 40 protrudes upward from the inner surface 21a of the bottom wall 21, and enters the resonance chamber 4b from the water drain hole 40. An inner water-impervious portion 41 that prevents the outside water from entering, or prevents the water that has entered from the outside through the drain hole 40 from spreading, and the outer surface 21b of the bottom wall 21 (ie, the lower surface of the first case 1) And an outer water-impervious portion 42 that prevents water from entering the drain hole 40 from the outside.

  The drain hole 40 made of a straight through-hole is formed to reach the inner water-impervious portion 41 made of a columnar protrusion integrally formed on the bottom wall 21, and opens to the outer peripheral surface of the inner water-impervious portion 41. It has an inlet 40a and an outlet 40b that opens to the outer surface 21b. A portion 40c formed in the inner water-impervious portion 41 in the drain hole 40 is formed by the wall of the inner water-impervious portion 41 on the side including the rear side and the left-right direction except for the inlet 40a that opens toward the front. Covered. Therefore, the water that has entered the drain hole 40 from the front through the outlet 40b during traveling of the vehicle collides with the inner surface of the inner water-impervious portion 41 and is prevented as much as possible from entering the resonance chamber 4b as much as possible.

  The outer water-impervious portion 42 is composed of a hanging wall that extends downward from the outer surface 21b of the bottom wall 21 around the outlet 40b substantially parallel to the horizontal plane and has an annular cross section in plan view. And the outer side water-impervious part 42 covers the front, rear, left and right circumferential directions of the outlet 40b, and the outlet 40b is formed on the outer surface 21b which is formed by the outer side water-impervious part 42 and becomes the ceiling surface of the inner space 43 opened downward. To do.

Next, operations and effects of the embodiment configured as described above will be described.
In the first drainage portion Da, the inlet 32a of the drainage hole 32 opens upward, and the inner water shielding portion 33 is constituted by a partition member 14 which is a member different from the first case 1, and the inner water shielding portion. The portion 33 covers the inlet 32a in plan view and is spaced apart from the inlet 32a so that the inner water-impervious portion 33 covers the inlet 32a that opens upward in plan view. Further intrusion or spread of the water that has entered the vent hole 32 in the main chamber 4a is hindered by the inner water shielding portion 33, and the inner water shielding portion 33 is provided above the inlet 32a that opens upward. Therefore, the water in the air cleaner A toward the inlet 32a flows into the drain hole 32 from the entire peripheral edge of the inlet 32a without being blocked by the inner water-impervious portion 33, thereby ensuring good drainage. And good water barrier, i.e. from the drainage hole 32 outside Even water enters, function invading water is prevented from possible or spread entering the deeper within the chamber 4a is ensured. Moreover, since the inner water-impervious portion 33 is formed of a member different from the first case 1, restrictions on the formation of the drain holes 32 provided in the first case 1 are eased. The degree of freedom in the arrangement of the drain holes 32 is increased.

  The inner water shielding portion 33 is constituted by a part of the partition member 14 that divides the dust chamber 4 into the main chamber 4a and the resonance chamber 4b, so that the inner water shielding portion 33 is integrated with the air cleaner A. Since a part of the partition member 14 that forms the structure is used, it is not necessary to separately prepare a member for the inner water-impervious portion 33, so that the number of parts and the number of assembling steps are reduced.

  The inner surface Wa of the peripheral wall W of the first case 1 is formed with a groove E into which water adhering to the inner surface Wa flows, and the inlet 32a opens to the bottom surface 31a of the collecting portion 31 that is a part of the groove E. Since the water that has entered through the drain hole 32 hits the side wall 31c and the side wall 31d of the collecting portion 31 through the inlet 32a that opens to the bottom surface 31a, the water that has entered exits from the groove 31 and scatters within the main chamber 4a. Therefore, it is possible to further prevent the water from entering the water drain hole 32 from the outside, that is, the air cleaner A, from further spreading.

  The bottom surface Ea of the groove E is an inclined surface that is inclined with respect to the horizontal plane, and the bottom surface 31a of the collecting portion 31 in which the inlet 32a of the drain hole 32 is formed is the lowermost portion, and therefore flows down the inner surface Wa of the entire peripheral wall W. Since the water flowing into the groove E is efficiently collected at the inlet 32a, the drainage efficiency is improved.

  The inner water-impervious portion 33 has a width h3 in the longitudinal direction that is larger than the width h2 of the inlet 32a in the longitudinal direction of the gathering portion 31, and exceeds both ends 32a1 and 32a2 of the inlet 32a in the longitudinal direction in plan view. By extending in the longitudinal direction, when water having a velocity component in the longitudinal direction of the collecting portion 31 enters through the drain hole 32, the water does not hit the side walls 31c and 31d, but the inner water shielding portion. Since it hits 33, it is suppressed that the invading water comes out of the collecting portion 31 and is scattered or spread. Therefore, the spreading of the water that has entered the drain hole 32 from the outside in the air cleaner A is further effective. Is suppressed.

  The inner water shielding portion 33 is separated from the inner surface 35a of the rear side wall 35 which is a part of the peripheral wall W of the first case 1, and the upper surface 33b of the inner water shielding portion 33 is inclined downward as it approaches the inner surface 35a. As a result, the water flowing down the inner surface 35a flows smoothly from the gap 37 formed between the tip portion 33a of the inner impermeable portion 33 and the inner surface 35a toward the inlet 32a without being blocked. Even when the amount of water flowing down 35a is larger than the amount flowing through the gap 37, the upper surface 33b of the inner water-impervious portion 33 is inclined, so that it is suppressed from flowing in a direction away from the inner surface 35a. Since the water that has flowed down remains in the portion with the gap 37, the drainage efficiency of the water flowing down the inner surface 35a is improved. Furthermore, since the upper surface 33b of the inner shielding part 33 is a lower part formed lower than the upper surface 18b of the outer peripheral edge part 18, the water accumulated on the upper surface 33b is further suppressed from spreading away from the inner surface 35a. Thus, since the flow on the upper surface 33b in the longitudinal direction of the collecting portion 31 is promoted, the drainage efficiency is further improved.

  The drain hole 32 is provided on the bottom surface 31a of the collecting portion 31 having the rear side wall 35 as a side wall, so that the water contained in the air adheres to the main flow F of the air flowing into the dust chamber 4. Since the water flowing down the inner surface 35a of the rear side wall 35 easily flows into the collecting portion 31 provided with the drain holes 32 and is discharged, the drainage efficiency of the water in the air cleaner A is improved.

  Since the first drainage portion Da has an annular groove E, the groove E can be formed like an intermediate portion between the bottom wall 21 as the lower end portion of the first case 1 and the flange portion 1a as the upper end portion, for example. Since the water drainage portion can be provided in any portion, the degree of freedom in disposing the water drainage holes 32 in the air cleaner A is increased.

Hereinafter, an embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
The drain hole 32 is composed of a single through hole, but may be composed of a plurality of holes arranged in parallel in the longitudinal direction of the collecting portion 31, and the cross-sectional shape thereof is also a rectangle such as a circle. Other shapes may be used.

  The inner water-impervious portion 33 may be formed of a separate member without being integrally formed with the partition member 14. In that case, the air cleaner may not be integrated with the resonator.

FIG. 3 is a perspective view showing a cutaway part of an air cleaner provided in the intake device of the internal combustion engine according to the embodiment of the present invention. FIG. 2 is an II arrow view of the air cleaner of FIG. 1. FIG. 3 is a view when the second case and the cleaner element are removed in FIG. 2, and is a view taken along arrow III in FIG. 4. It is sectional drawing in the IV-IV arrow of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged view by the VI arrow of FIG. It is a principal part enlarged view by the VII arrow of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st case, 2 ... 2nd case, 3 ... Cleaner element, 4 ... Dust chamber, 5 ... Clean chamber, 6 ... Clamp, 7 ... Inlet part, 8 ... Air introduction pipe, 9 ... Outlet part, 10 ... Air Lead pipe, 11, 12 ... Resonator, 13 ... Communication pipe, 14 ... Partition member, 15 ... Main body, 16, 17 ... Communication pipe, 18 ... Outer peripheral edge, 19 ..., 20 ... Holding part, 21 ... Bottom wall,
30 ... Step part, 31 ... Collecting part, 32,40 ... Drain hole, 33,41 ... Inner water shielding part, 34,42 ... Outer water shielding part, 35 ... Rear wall, 36 ... Bottom wall, 37 ... Gap, 38 ... hanging wall, 39, 43 ... internal space,
A: Air cleaner, Af: Front side, Ar ... Rear side, C ... Air chamber, W ... Peripheral wall, B ... Bracket, Wa ... Inner surface, E ... Groove, Ea ... Bottom, h1, h2, h3 ... Width, F ... Mainstream.

Claims (3)

In an air cleaner provided with a case that forms an air chamber, a drain hole for discharging water in the air chamber to the outside is provided in the case.
The case includes a bottom wall and a peripheral wall extending upward from the bottom wall, and an inner surface of the peripheral wall is provided with a step portion having a step surface that has an annular shape in plan view. The part is formed with an annular groove that opens upward and extends along the inner surface, and the drainage hole is constituted by a part of the annular groove and collects the water flowing into the annular groove. The bottom surface of the annular groove is formed such that the bottom surface of the gathering portion where the inlet of the drain hole is opened is the lowest part,
The collecting portion is provided on the stepped portion formed in a portion having a main flow strikes the inner surface of the air flowing into the air chamber in the peripheral wall, said part, and features that you configure the sidewalls of the collecting portion Air cleaner.   The air chamber is divided into a first chamber and a second chamber by a partition member, an outer side wall of the annular groove is constituted by the peripheral wall, and an inner side wall of the annular groove is an annular shape on which the partition member is placed. The air cleaner according to claim 1, wherein the air cleaner is constituted by a holding portion comprising a plurality of protrusions. In an air cleaner provided with a case that forms an air chamber, a drain hole for discharging water in the air chamber to the outside is provided in the case.
The case includes a bottom wall and a peripheral wall extending upward from the bottom wall, and an inner surface of the peripheral wall is provided with a step portion having a step surface that has an annular shape in plan view. The part is formed with an annular groove that opens upward and extends along the inner surface, and the drainage hole is constituted by a part of the annular groove and collects the water flowing into the annular groove. The bottom surface of the annular groove is formed such that the bottom surface of the gathering portion where the inlet of the drain hole is opened is the lowest part,
The air chamber is divided into a first chamber and a second chamber by a partition member, an outer side wall of the annular groove is constituted by the peripheral wall, and an inner side wall of the annular groove is an annular shape on which the partition member is placed. Consists of a holding part consisting of
A plate-like protrusion that protrudes so as to cover the opening of the assembly part from the holding part, while the water shielding part that prevents the spread of water that has entered from the outside through the drain hole is a part of the partition member It is constituted by a part, the water shielding part, features and to Rue Akurina that are spaced apart from the inlet with covering the inlet in a plan view upward.

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