JP6028599B2 - Air cleaner - Google Patents

Description

  The present invention relates to an air cleaner suitably used for a motorcycle.

  2. Description of the Related Art As a motorcycle air cleaner, a configuration that guides air taken in through an intake duct or the like to a filter (element) is widely used.

  For example, in Patent Document 1, a downstream end face is connected to a cleaner case containing a filter (element) and a pair of left and right front end air inlets opened in the cleaner case, and the upstream side is connected to a pair of left and right main frames of the vehicle body. An air cleaner (intake device) including a pair of left and right intake ducts that are inserted and extended is disclosed. Each intake duct is formed so as to be largely curved, and is formed so that the flow cross-sectional area increases from the upstream side to the downstream side in the air flow direction. The filter is provided so as to block each front end air inlet.

Japanese Patent Laying-Open No. 2005-083279

  In general, the intake duct needs to be formed to have a certain length in order to reduce intake noise and prevent inhalation of foreign matter. In the technique described in Patent Document 1, in order to ensure a certain length, each intake duct is greatly curved and extended greatly from the cleaner case into each front main frame. Thus, when each intake duct is curved, there is a possibility that the air ventilation resistance increases, the intake efficiency is lowered, and the engine performance cannot be maintained. In this case, the air ventilation resistance can be reduced by expanding the diameter of the intake duct, but as the intake cross section of the intake duct increases, the intake sound easily leaks from the intake duct, and the intake noise increases. The intake duct could not be expanded easily. Further, the technique described in Patent Document 1 has a problem that the air cleaner is increased in size because each intake duct is provided so as to largely protrude forward from the cleaner case.

  The present invention has been made to solve the above-described problems, and provides an air cleaner that can reduce the air ventilation resistance inside the inlet tube and the cleaner case and can be downsized. Objective.

  The air cleaner of the present invention is an air cleaner in which the internal space of the cleaner case is partitioned into a dirty side and a clean side by a filter formed in a planar shape, and as the air flows from the upstream side toward the downstream side The inlet tube is formed so as to increase the flow cross-sectional area, the inlet tube extends along the filter, and the downstream side in the air flow direction is inserted into the dirty side in the cleaner case. It is supported.

  According to this configuration, since the inlet tube is formed linearly, the air ventilation resistance can be reduced as compared with, for example, a curved case. Moreover, since the inlet tube is inserted in the dirty side of the cleaner case, the amount of protrusion of the inlet tube from the cleaner case can be reduced while ensuring a certain length of the inlet tube. Thereby, an air cleaner can be reduced in size.

  By the way, when the inlet tube is inserted into the cleaner case, the downstream end (exit) of the inlet tube and the inner wall surface of the cleaner case on the dirty side are brought close to each other. At this time, if the flow velocity of air is high, the air ventilation resistance increases on the dirty side. However, according to said structure, since the distribution cross-sectional area of an inlet tube has expanded gradually toward the downstream, the flow velocity of the taken-in air reduces toward an exit. Accordingly, since the air flowing out from the outlet of the inlet tube is low speed, an increase in air ventilation resistance on the dirty side can be suppressed even if the air collides with the inner wall surface of the cleaner case. Thus, the inlet tube can be inserted deeply into the cleaner case to achieve compactness, and engine performance can be maintained by reducing the airflow resistance inside the inlet tube and the cleaner case.

  In this case, the dirty side and the clean side are partitioned in the vertical direction by the filter, and the inlet tube is formed to have a size that fits within the horizontal projection plane of the filter, and within the horizontal projection plane of the filter. It is preferable to be supported so as to fit.

  According to this configuration, the downstream side of the inlet tube is inserted into the cleaner case in a state where the entire inlet tube is disposed within the horizontal projection plane of the filter. As a result, the inlet tube that secures a certain length can be arranged in a straight line without protruding from the cleaner case, so that space can be used effectively and a decrease in engine output due to increased ventilation resistance is suppressed. can do.

  Further, in this case, the cleaner case is configured to be vertically divided by a case main body and a cap, and the filter is provided between the case main body and the cap, and a part of the cap includes: A protrusion having an inclined surface portion inclined upward toward the downstream side in the air flow direction is formed, and the inlet tube is inserted into an opening formed on the inclined surface portion on the downstream side in the air flow direction, and the filter It is preferably supported with a gap between them.

  According to this configuration, since the opening that is the attachment portion of the inlet tube is formed in the inclined surface portion, the inclined surface portion acts like a reinforcing rib, and, for example, compared to the case where the opening portion is formed in a vertical plane, High rigidity can be maintained. Further, a part of the air introduced through the inlet tube is guided to the gap between the filter and the inner surface of the inclined surface portion on the dirty side. For this reason, the air introduced into the dirty side is distributed substantially evenly over the entire area of the filter. Thereby, since the filter is used for air purification without any deviation, the life of the filter can be improved. Furthermore, since the opening formed in the inclined surface portion becomes a large opening as compared with a case where the opening portion is formed in a vertical plane, for example, the inlet tube can be easily inserted into the opening portion. Moreover, since the contact part with respect to the outer peripheral surface of the inserted inlet tube increases, the retention strength of an inlet tube improves and it can maintain the clearance gap with a filter appropriately.

  Further, in this case, the inlet tube is made of an elastic material, and the intake passage inside the inlet tube is provided with a rib that divides the intake passage substantially along the air flow direction. preferable.

  According to this configuration, since the inlet tube is formed of an elastic material having a high vibration damping force, intake noise can be reduced. Moreover, a deformation | transformation of an inlet tube can be suppressed by providing a rib inside an inlet tube.

  ADVANTAGE OF THE INVENTION According to this invention, air ventilation resistance inside an inlet tube or a cleaner case can be reduced, and size reduction can be achieved.

1 is a side view showing a body frame of a motorcycle equipped with an air cleaner according to an embodiment of the present invention. 1 is a plan view showing a body frame or the like of a motorcycle equipped with an air cleaner according to an embodiment of the present invention. It is a disassembled perspective view which shows the air cleaner which concerns on one Embodiment of this invention. It is a top view which shows the air cleaner which concerns on one Embodiment of this invention. It is a side view which shows the air cleaner which concerns on one Embodiment of this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a body frame of a motorcycle equipped with an air cleaner according to the present embodiment, and FIG. 2 is a plan view. For convenience of explanation, the forward (forward) direction of the vehicle is assumed to be forward, and the front, rear, left and right, and upper and lower are defined as indicated by arrows in the drawings with reference to the driver who has boarded the vehicle.

  As shown in FIGS. 1 and 2, the body frame 2 of the motorcycle 1 includes a head pipe 10, an upper pipe 11 extending rearward from the head pipe 10, and a lower pipe 12 extending downward from the head pipe 10. The pair of left and right center pipes 13 extending downward from the rear end portion of the upper pipe 11, the pair of left and right seat rails 14 extending rearward from the rear end portion of the upper pipe 11, each center pipe 13 and each seat rail 14 And a pair of left and right seat stays 15 that are connected to each other by welding or the like. A reinforcing pipe 16 is provided between the upper pipe 11 and the lower pipe 12.

  A front fork that supports the front wheels is supported on the head pipe 10 together with a handlebar and the like (both not shown) so as to be steerable left and right.

  A fuel tank (not shown) is provided above the upper pipe 11, and a seating seat (not shown) is attached to the upper side of the seat rail 14.

  An air cleaner 3 is provided in a substantially triangular space surrounded by each center pipe 13, each seat rail 14, and each seat stay 15 in a side view.

  Engine suspension brackets 17 a, 17 b, and 17 c for fixing the engine 18 are provided near the lower end of the lower pipe 12, near the middle of each center pipe 13, and near the lower end. The engine 18 functions as a structural member of the vehicle body frame 2 by being connected to the lower pipe 12 and each center pipe 13.

  A front end portion of a swing arm 19 that supports a rear wheel (not shown) is fastened together with an engine 18 by an engine fixing bolt 19a to an engine suspension bracket 17b provided near the middle of each center pipe 13. The swing arm 19 is supported so as to be swingable up and down around a portion fixed by the engine fixing bolt 19a.

  A cushion bracket 11a is provided at the rear end portion of the upper pipe 11, and the upper end portion of the rear cushion unit 20 is rotatably connected to the cushion bracket 11a by a pivot shaft 20a. Further, the lower end portion of the rear cushion unit 20 is connected to the swing arm 19 so as to be rotatable by a pivot shaft 20b.

  The engine 18 is, for example, a single-cylinder four-cycle air-cooled engine, and includes a cylinder assembly 22 that is provided on the upper surface of the engine case 21 so as to be inclined forward. The cylinder assembly 22 includes a cylinder block 22a, a cylinder head 22b, and a head cover 22c in order from the engine case 21 side.

  An intake port 23 is provided at the rear of the cylinder head 22b. An air cleaner 3 is connected to the intake port 23 via a fuel supply device 24.

  On the other hand, an exhaust port 25 to which an exhaust pipe 26 is connected is provided at the front portion of the cylinder head 22b. The exhaust pipe 26 is curved so as to make a U-turn downward, extends rearward through the lower side of the engine case 21, and an exhaust muffler 27 is connected to the rear end of the exhaust pipe 26.

  Next, the air cleaner 3 will be described in detail with reference to FIGS. 3 to 8. 3 is an exploded perspective view showing the air cleaner 3 according to the present embodiment, FIG. 4 is a plan view, and FIG. 5 is a side view. 6 is an AA cross-sectional view in FIG. 4, and FIGS. 7 and 8 are a BB cross-sectional view and a CC cross-sectional view in FIG.

  As shown in FIG. 3 to FIG. 5, the air cleaner 3 includes a cleaner case 30 constituting the main appearance, and a planar filter 31 that divides the internal space of the cleaner case 30 into a dirty side 33 and a clean side 34. And an inlet tube 32 for taking outside air into the cleaner case 30.

  The air cleaner 3 is disposed in a posture inclined forward and downward along the seat stay 15, and a front portion thereof is disposed so as to protrude from the center pipe 13 toward the engine 18 (see FIG. 1).

  The cleaner case 30 is formed of a resin material, and is configured to be vertically split by a case body 35 and a cap 36.

  The case body 35 is configured by joining a filter case portion 40 located on the left side of the vehicle and an outer cover 41 located on the right side of the vehicle and exposed to the outside.

  The filter case part 40 is substantially L-shaped in plan view by a support part 42 formed in a substantially rectangular shape in plan view and an extension part 43 formed to extend forward from the right front part of the support part 42. Are integrally formed. Since the filter case portion 40 is substantially L-shaped, the filter case portion 40 is disposed between the seat rail 14 and the seat stay 15 so as to avoid the rear cushion unit 20 (see FIGS. 1 and 2). ).

  The support portion 42 is disposed behind the rear cushion unit 20 and is formed in a rectangular box shape with the upper surface and the right side surface opened. Specifically, the support portion 42 is formed in a box shape whose bottom surface is inclined downward toward the front and whose front side is deeper than the rear side. That is, the support part 42 is formed in a substantially triangular shape with an acute angle at the rear when viewed from the side. A lower fitting groove 42b is formed in an annular shape at the edge of the upper surface opening 42a of the support portion 42 (see FIGS. 6 and 7). Further, four screw hole portions 42c are formed on both the left and right outer sides of the lower fitting groove 42b and on both front and rear ends (see FIG. 3).

  The extending portion 43 is formed in a box shape that is bent in a crank shape in the middle in the front-rear direction when viewed from the side, and has the right side surface opened. In detail, the lower surface of the extension part 43 extends forward while being inclined downwardly connected to the lower surface of the support part 42, and is bent forward at the lower step part 43 a in the middle of the front-rear direction and extended forwardly while being inclined upward. Has been. Further, the upper surface of the extending portion 43 is formed to extend forward from the support portion 42 while being bent at an upper step 43b slightly forward and inclined upward. Further, the extending portion 43 is formed such that the front portion is wider than the lower step portion 43a and the upper step portion 43b in the vertical direction than the rear portion.

  Further, an inner protruding portion 44 is formed at the front end portion of the extending portion 43 so as to protrude toward the inner side (left side) in the vehicle width direction, and a circular tube opening 44 a is formed on the front surface of the inner protruding portion 44. Is formed. A breather union 44b for connecting the breather hose 28 of the engine 18 is provided on the lower surface of the inner projecting portion 44 (see FIG. 5).

  Fixing brackets 35a and 35b for fixing the entire air cleaner 3 to the vehicle body frame 2 are integrally formed on the left front surface of the support portion 42 and the front upper surface of the extension portion 43 (see FIG. 5).

  The outer cover 41 is formed in a tray shape having the same side view shape as the opened right side surface of the filter case portion 40 (the support portion 42 and the extending portion 43), and closes the right side surface of the filter case portion 40. To be joined. The outer cover 41 is provided with three ridges 41a extending at a slight forward inclination in the vertical direction at equal intervals.

  An intake pipe 45 is disposed in the internal space formed between the extension part 43 and the outer cover 41, and the front end part of the intake pipe 45 is exposed to the outside from the pipe opening 44 a of the extension part 43. In a protruding state, it is fixed to the tube opening 44a. The fuel supply device 24 is connected to the intake pipe 45 exposed from the pipe opening 44a (see FIG. 1).

  Subsequently, as shown in FIGS. 3 to 5, the cap 36 includes a cap base portion 46 formed in a substantially rectangular shape in plan view and a cap protrusion portion 47 formed so as to protrude upward from the cap base portion 46. It is constructed integrally.

  The cap base portion 46 is slightly smaller than the support portion 42 in a plan view, and is formed in a rectangular box shape having an open lower surface. An upper fitting groove 46b is formed in an annular shape at the edge of the lower surface opening 46a of the cap base portion 46 (see FIGS. 6 and 7). Furthermore, screw fastening brackets 46c are integrally formed on both the left and right end surfaces of the cap base portion 46 at the front and rear end portions so as to project at positions corresponding to the four screw hole portions 42c of the support portion 42 described above.

  The cap protrusion 47 is integrally formed with the same thickness as the cap base 46, and has a substantially rectangular box shape with the lower surface opened (see FIG. 6). That is, the internal space of the cap base portion 46 and the cap protruding portion 47 is integrally formed. The cap projecting portion 47 is formed with an inclined surface portion 47 a that is inclined slightly upward from the rear side of the center of the cap base portion 46 in the front-rear direction. The inclined surface portion 47a is formed with a substantially elliptical slant opening 47b that is elongated in the left-right direction. The upper surface of the cap protruding portion 47 is formed so as to be gently inclined upward from the upper end of the inclined surface portion 47a, and the front surface and the right side surface of the cap protruding portion 47 are flush with the front end surface and the right end surface of the cap base portion 46. It is made. In addition, a curved portion 47c that is curved downward in a front view is formed on the left side surface of the cap protruding portion 47 (see FIG. 7). Three vertical ribs 47d extending in the vertical direction are provided at equal intervals on the left and right side surfaces of the cap protrusion 47 and the cap base 46, respectively.

  As shown in FIG. 3, the filter 31 is formed in a rectangular thick plate shape that can be fitted into the upper surface opening 42 a of the support portion 42 and the lower surface opening 46 a of the cap base portion 46. In addition, on the front, rear, left, and right end surfaces of the filter 31, rectangular annular engagement flange portions 48 are formed in plan view. The engagement flange portion 48 branches vertically on the tip (free end) side protruding outward from the substantially vertical center of each end surface of the filter 31 and has a substantially T-shaped cross section (see FIG. 6 and FIG. 6). (See FIG. 7).

  As shown in FIG. 6 and FIG. 7, when the lower side of the filter 31 is fitted into the upper surface opening 42 a of the support portion 42, the lower side of the engagement flange portion 48 is the lower fitting groove 42 b of the support portion 42. Is engaged. Similarly, when the filter 31 covers the cap 36 from above and is fitted into the lower surface opening 46a of the cap base portion 46, the upper side of the engagement flange portion 48 is the upper fitting groove 46b of the cap base portion 46. Is engaged. The cap 36 is detachably fixed to the case body 35 by screwing screws S into the screw hole portions 42c via the screw fastening brackets 46c (see FIGS. 3 to 5). In this state, the filter 31 is sandwiched between the case body 35 and the cap 36. The filter 31 can be easily replaced by unscrewing the screws S and removing the cap 36.

  The internal space of the cleaner case 30 is partitioned into a dirty side 33 and a clean side 34 by the filter 31 sandwiched between the joint surface of the case main body 35 (support portion 42) and the cap 36. Specifically, the internal space of the cap 36 above the filter 31 is the dirty side 33, and the internal space of the case body 35 below the filter 31 is the clean side 34. A gap 49 is formed between the cap base portion 46 (rear side) and the filter 31 (see FIG. 6).

  Next, the inlet tube 32 will be described with reference to FIGS. The inlet tube 32 is made of an elastic material such as resin or rubber, and is formed in a substantially cylindrical shape having a substantially elliptical cross section that gradually increases in diameter toward the front (downstream side). The inlet tube 32 is formed in a substantially trapezoidal shape that is smaller than the filter 31 and spreads in the left-right direction toward the front in plan view. In addition, the inlet tube 32 is formed in a substantially trapezoidal shape that is lower than the height of the cap protrusion 47 of the cap 36 and spreads upward and downward in a side view.

  As shown in FIGS. 6 to 8, a substantially elliptical intake passage 50 that is elongated in the left-right direction and serves as an air flow path is formed in the inlet tube 32 in the front-rear direction. The intake passage 50 is formed so that the thickness of the inlet tube 32 is substantially the same.

  The intake passage 50 is provided with plate-shaped dividing ribs 52 that equally divide the intake passage 50 left and right along substantially the air flow direction. The intake flow path 50 is divided into two linear divided flow paths 51 arranged side by side by the divided ribs 52. Each divided flow path 51 has a substantially semicircular shape elongated in the left-right direction, and is formed symmetrically about the divided rib 52.

  The dividing rib 52 is integrally formed so as to connect the upper inner surface and the lower inner surface of the intake flow channel 50 at the center in the left-right direction of the inlet tube 32. Further, the dividing rib 52 is formed so that the lateral width gradually becomes smaller (thinner) from the upstream to the downstream (back to front) in the air flow direction (see FIG. 8). For this reason, each division | segmentation flow path 51 of the inlet tube 32 is formed so that it may become large in the up-down direction and the left-right direction as it goes to the downstream from the flow direction of air. That is, the flow cross-sectional area is gradually increased from the upstream side to the downstream side in the air flow direction. Each divided flow channel 51 (intake flow channel 50) has a length and a diameter (circulation cross-sectional area) in consideration of reduction of intake sound and prevention of inhalation of foreign matters such as dust.

  On the entire outer peripheral surface of the inlet tube 32, a packing portion 53 having an annular groove portion 53b is integrally formed between two annular convex portions 53a projecting in the radial direction in a substantially central region in the front-rear direction. The packing part 53 is formed to have the same inclination as the inclined surface part 47 a of the cap 36.

  The inlet tube 32 is fixed by inserting the downstream side (front side) of the air flow direction into the inclined surface opening 47b of the inclined surface portion 47a and fitting the peripheral edge portion of the inclined surface opening portion 47b into the annular groove portion 53b of the packing portion 53. (See FIG. 6). That is, the inlet tube 32 extends linearly along the upper surface of the filter 31 (upper side of the joint surface between the case main body 35 and the cap 36), and the downstream side of the center in the front-rear direction is inserted into the dirty side 33. In this state, the cleaner case 30 is supported. In this state, the inlet tube 32 is disposed on the filter 31 so that the upstream side does not protrude from the cap 36 in plan view. That is, the inlet tube 32 is housed in the horizontal projection plane of the filter 31 in a supported state (see FIGS. 3, 4, and 8).

  The inlet tube 32 is arranged so that the axial center line of each divided flow channel 51 (see the alternate long and short dash line showing the CC cross section in FIG. 6) and the filter 31 are parallel to the dirty side 33 of the inlet tube 32. It is supported with a gap 54 between the inserted portion and the filter 31.

  An outlet space 55 is formed between the downstream end (front end) of the inlet tube 32 in the dirty side 33 and the front inner wall surface 47 e of the cap protrusion 47.

  In the air cleaner 3 configured as described above, when an intake negative pressure is generated by the operation of the engine 18, outside air (air) is discharged from each divided flow path 51 of the inlet tube 32 that is opened rearward in the traveling direction of the motorcycle 1. Inhaled. This air is taken into the dirty side 33 via the inlet tube 32 and passes through the filter 31 downward to remove foreign matters such as dust and flows to the clean side 34. The air from which the foreign matter has been removed flows in the case main body 35 (the space surrounded by the filter case portion 40 and the outer cover 41) as the clean side 34 toward the downstream side (the support portion 42 to the extension portion 43). It is supplied from the pipe 45 to the engine 18 through the fuel supply device 24.

  According to the air cleaner 3 according to the present embodiment, since the inlet tube 32 (each divided flow path 51) is formed linearly, for example, the air ventilation resistance is reduced as compared with the case where the air tube 3 is curved. Can do. In addition, since the inlet tube 32 is inserted into the dirty side 33 of the cleaner case 30, the amount of protrusion of the inlet tube 32 from the cleaner case 30 can be reduced while ensuring a certain length of the inlet tube 32. . As a result, it is possible to reduce the intake noise and prevent foreign matter inhalation and to reduce the size of the air cleaner 3.

  By the way, in the air cleaner 3 according to the present embodiment, since the inlet tube 32 is inserted into the cleaner case 30, the downstream end of the inlet tube 32 and the front inner wall surface 47e of the cap protruding portion 47 approach each other, and the outlet space 55 May not be sufficient. Thus, even when the outlet space 55 cannot be sufficiently secured, in the air cleaner 3 according to the present embodiment, the flow cross-sectional area of the inlet tube 32 (each divided flow path 51) is expanded toward the downstream. Therefore, the flow speed of the introduced air decreases toward the downstream. Accordingly, since the air flowing out from the downstream end (exit) of the inlet tube 32 is low speed, even if this air collides with the front inner wall surface 47e, it is possible to suppress an increase in air ventilation resistance in the exit space 55. it can. Thereby, the inlet tube 32 can be inserted deeply into the cleaner case 30 to achieve compactness, and the airflow resistance in the inlet tube 32 (each divided flow channel 51) and the cleaner case 30 (exit space 55) can be reduced. The performance of the engine 18 can be maintained by the reduction.

  Further, according to the air cleaner 3 according to the present embodiment, the entire inlet tube 32 is formed in a size that can be accommodated in the horizontal projection plane of the filter 31 and is supported so as to be accommodated in the horizontal projection plane of the filter 31. . As a result, the inlet tube 32 having a certain length can be arranged linearly without protruding from the cleaner case 30, so that space can be used effectively and the output of the engine 18 due to increased ventilation resistance. Can be suppressed.

  Further, according to the air cleaner 3 according to the present embodiment, the inclined surface portion 47a is formed as the reinforcing rib in order to form the inclined surface portion 47b, which is the attachment portion of the inlet tube 32, in the inclined surface portion 47a. Or, the rigidity of the cap 36 can be kept high as compared with the case where the opening is formed in the horizontal plane.

  A part of the air introduced through the inlet tube 32 flows along the inner surface of the inclined surface portion 47 a on the dirty side 33 and is guided to the gaps 49 and 54 between the filter 31. For this reason, the air introduced into the dirty side 33 is distributed substantially evenly throughout the filter 31. Thereby, since the filter 31 is used for air purification without any deviation, the life of the filter 31 can be improved.

  Furthermore, since the slope opening 47b formed in the inclined surface portion 47a is a large opening as compared with the case where it is formed in a vertical plane, for example, the inlet tube 32 can be easily inserted into the slope opening 47b. Moreover, since the contact part with respect to the outer peripheral surface of the inserted inlet tube 32 increases, the retention strength of the inlet tube 32 improves and the gap | interval with the filter 31 can be maintained appropriately.

  Moreover, according to the air cleaner 3 which concerns on this embodiment, since the inlet tube 32 is formed with the material with high vibration damping force of resin type | system | group and rubber type | system | group, intake noise can be reduced. Further, by providing the split rib 52 inside the inlet tube 32, deformation of the inlet tube 32 can be suppressed. In addition, the dividing rib 52 may be provided in the left-right direction, the dividing flow path 51 may be formed up and down, or one or more dividing ribs 52 may be provided to form two or more dividing flow paths 51.

  In addition, since description of embodiment of the above-mentioned this invention has demonstrated suitable embodiment in the air cleaner 3 which concerns on this invention, it may attach various technically preferable restrictions, The technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. Furthermore, the components in the embodiment of the present invention described above can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention is not intended to limit the content of the invention described in the claims.

3 Air cleaner 30 Cleaner case 31 Filter 32 Inlet tube 33 Dirty side 34 Clean side 35 Case body 36 Cap 47 Cap protrusion (protrusion)
47a Inclined surface 47b Slope opening (opening)
50 Intake channel 52 Split rib (rib)

Claims (3)

An air cleaner in which the internal space of the cleaner case is partitioned into a dirty side and a clean side by a filter formed in a plane,
The inlet tube is formed so that the flow cross-sectional area gradually increases from the upstream side to the downstream side in the air flow direction,
The inlet tube is formed of an elastic material , extends along the filter, and is supported by the cleaner case in a state where the downstream side in the air flow direction is inserted into the dirty side ,
The intake channel inside the inlet tube is provided with a rib that divides the intake channel into two divided channels substantially along the air flow direction,
The inlet tube is disposed so that the axial center line of each of the divided flow paths formed linearly and the filter are parallel to each other,
The ribs, an air cleaner, characterized that you have been formed so as to be gradually narrowed toward the downstream side from the flow direction upstream side of the air. The dirty side and the clean side are partitioned in the vertical direction by the filter,
2. The air cleaner according to claim 1, wherein the inlet tube is formed to have a size that fits within a horizontal projection plane of the filter and is supported so as to fit within a horizontal projection plane of the filter. The cleaner case is configured to be vertically split by a case body and a cap,
The filter is provided between the case body and the cap,
A part of the cap is formed with a protruding portion having an inclined surface portion inclined upward toward the downstream side of the air flow direction,
The said inlet tube is inserted in the opening part formed in the said inclined surface part in the distribution direction of air, and is supported in the state which has the clearance gap between the said filters. The air cleaner described in 1.

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