JP2022130490A - Purification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purification device which can improve intake efficiency by introducing intake air up to a clean side by an inertia possessed by the intake air.

SOLUTION: In a purification device having an air cleaner 81 in which a first half body 92 and a second half body 93 are partitioned by an element 95, and a clean side 94B and a dirty side 94A are formed, and an intake duct 82 for introducing atmospheric air into the dirty side 94A, the intake duct 82 is arranged while being extended into the dirty side 94A in an orientation along a face 95A of the element 95, and a rectification wall 102 for guiding the intake air introduced from a downstream-side end 82B of the intake duct 82 so as to progress toward the face 95D of the element 95 is arranged in the dirty side 94A.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a purification device.

As a conventional technique, an air cleaner that extends vertically and has a compact front-to-rear width has been disclosed (see, for example, Patent Document 1). In Patent Document 1, the air intake duct is arranged to extend into the dirty side along the surface of the element.

Japanese Patent No. 6333873

In order to improve the charging efficiency of the intake air to the clean side of the air cleaner, it is conceivable to use the inertia of the intake air from the dirty side to introduce the intake air to the clean side through the element. However, when the air intake duct extends into the dirty side along the surface of the element as in the structure of the prior art, the intake air introduced into the dirty side from the downstream end of the air intake duct is inertially applied to the surface of the element. It is assumed that it will be introduced in the direction along and hinder efficient filling.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a purifying apparatus capable of improving intake efficiency by introducing intake air to the clean side due to the inertia of the intake air.

The purification device comprises an air cleaner (81) having a first half (92) and a second half (93) partitioned by an element (95) to form a clean side (94B) and a dirty side (94A); an intake duct (82) for introducing outside air into (94A), wherein said intake duct (82) is directed along the surface (95D) of said element (95) and inside said dirty side (94A). inside the dirty side (94A), the intake air introduced from the downstream end (82B) of the intake duct (82) is guided toward the surface (95D) of the element (95). The straightening wall (102) is provided with a wide width along the direction intersecting the extending direction of the intake duct (82), and the end portion of the straightening wall (102) A second rectifying wall (103) extending in a direction intersecting the extension of the rectifying wall (102) is provided on the extension of the .

In the above configuration, the downstream end (82B) opens in a direction along the surface (95D) of the element (95), and the rectifying wall (102) extends from the element (95) of the second half (93). ) to protrude in the direction of the element (95).

Further, in the above configuration, a side of the straightening wall (102) on which the intake duct (82) is arranged may have an R shape.

Further, in the above configuration, the rectifying wall (102) may be provided at a position overlapping the tangential extension line (L2) of the downstream end (82B) of the air intake duct (82) in the front-rear direction.

Further, in the above configuration, the straightening wall (102) may be provided in an arcuate shape with a concave portion on the intake duct (82) side.

Further, in the above configuration, the first half (92) has an air funnel (84) for leading intake air from the clean side (94B), and the upstream end (84A) of the air funnel (84) is the intake air. The downstream end (82B) of the duct (82) may be open, and the downstream end (82B) of the intake duct (82) may be open to the upstream end (84A) of the air funnel (84).

A purifying device comprising: an air cleaner having a first half and a second half partitioned by an element to form a clean side and a dirty side; and an intake duct for introducing outside air into the dirty side. The duct is arranged to extend into the dirty side in a direction along the surface of the element, and guides the intake air introduced from the downstream end of the intake duct toward the surface of the element in the dirty side. A straightening wall is provided, and the straightening wall is provided with a wide width along a direction intersecting the extending direction of the air intake duct. A second straightening wall is provided that extends in a crossing direction. According to this configuration, the intake air introduced into the dirty side from the downstream end of the intake duct is guided along the surface of the element by inertia, but the intake air is guided toward the surface of the element by the rectifying wall. Therefore, the inertia of the intake air can lead to the clean side, and the intake efficiency can be improved. Further, according to this configuration, it is possible to direct the intake air over a wide range of the element. Furthermore, according to this configuration, the intake air directed in the wide direction of the rectifying wall can be directed to the element side by the second rectifying wall.

In the above configuration, the downstream end may be opened in a direction along the surface of the element, and the straightening wall may be formed by protruding in the direction of the element from a wall surface of the second half that faces the element. good. According to this configuration, since the rectifying wall is formed by protruding from the second half in the direction toward the surface of the element, it is possible to direct the intake air toward the element with a simple structure.

Further, in the above configuration, a side of the straightening wall on which the air intake duct is arranged may have an R shape. According to this configuration, it is possible to direct the intake air toward the element side while suppressing the pressure loss of the intake air.

Further, in the above configuration, the straightening wall may be provided at a position that overlaps a tangential extension line of the downstream end of the air intake duct in the front-rear direction. According to this configuration, the intake air can be directed toward the element side efficiently.

Further, in the above configuration, the rectifying wall may be provided in an arc shape that is concave on the intake duct side. According to this configuration, it is possible to direct the intake air over a wider area of the element.

Further, in the above configuration, the first half has an air funnel for leading intake air from the clean side, and the upstream end of the air funnel opens to the downstream end side of the intake duct, and the downstream end of the intake duct. The end may be open on the upstream end side of the air funnel. According to this configuration, the intake air introduced from the intake duct can be more smoothly introduced into the air funnel.

1 is a right side view of a motorcycle according to an embodiment of the present invention; FIG. FIG. 2 is a plan view of the vehicle body frame viewed from above; FIG. 2 is a cross-sectional view taken along the vehicle width direction center of the motorcycle, showing the peripheral portions of the steering system and the purification device; It is a cross-sectional view along the center of the left-right width of the purifier. It is a rear view of a purifier. It is the front view which looked at the second half body from the inner surface side. It is the perspective view which looked at the second half body from the left front. 6 is an enlarged view of the periphery of the drain hole in FIG. 5; FIG. FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8; FIG. 5 is a diagram showing CFD analysis results of intake air in an air cleaner case;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, directions such as front, rear, left, right, and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and LH indicates the left side of the vehicle body.

FIG. 1 is a right side view of a motorcycle 1 according to an embodiment of the invention. Incidentally, in the side views of the following description, only one side of the pair of right and left components is shown.
In the motorcycle 1, an engine 10 as a power unit is supported on a body frame F, a steering system 11 that steerably supports front wheels 2 is steerably supported at the front end of the body frame F, and a swing arm that supports rear wheels 3. 12 is a vehicle provided on the rear side of the vehicle body frame F. FIG. The motorcycle 1 is a saddle type vehicle in which a riding seat 13 (passenger seat) on which a rider straddles is provided above the rear portion of the body frame F. As shown in FIG.

FIG. 2 is a plan view of the vehicle body frame F viewed from above.
1 and 2, the vehicle body frame F includes a head pipe 14 provided at the front end, a pair of left and right main frames 15, 15 (frame members) extending rearwardly downward from the rear portion of the head pipe 14, and a main frame member. A pair of left and right down frames 16, 16 extending rearward and downward from the front ends of the frames 15, 15; a pair of left and right pivot frames 17, 17 extending downward from the rear ends of the main frames 15, 15; A pair of left and right seat frames 18, 18 are provided that extend rearwardly upward from the upper portion of the seat frame 17 to the rear end of the vehicle.

The main frames 15, 15 are composed of main frame body portions 15a, 15a extending rearwardly and downwardly from the lower portion of the head pipe 14 at a relatively gentle slope, and connecting the upper portion of the head pipe 14 and the front portions of the main frame body portions 15a, 15a. and reinforcing frame portions 15b, 15b. As shown in FIG. 2, the main frame main body portions 15a, 15a include frame front portions 15c, 15c extending from the head pipe 14 and having an interval in the vehicle width direction that increases toward the rear in a plan view, and frame front portions 15c, 15c. frame rear portions 15d, 15d extending rearwardly from the rear ends thereof substantially parallel to each other.

The left and right reinforcing frame portions 15b, 15b are spaced apart from each other in the vehicle width direction toward the rear, and extend rearwardly downward with a greater inclination than the main frame body portions 15a, 15a. Stays 27, 27 are provided at front end portions of the reinforcing frame portions 15b, 15b. Further, the reinforcing frame portions 15b, 15b are provided with air cleaner case stays 34, 34 behind the stays 27, 27, respectively.
The vehicle body frame F also includes a pair of left and right connection frames 19, 19 that connect the front and rear intermediate portions of the main frame body portions 15a, 15a and the down frames 16, 16. As shown in FIG.
The pivot frames 17, 17 have pivot holes (not shown) in the upper and lower intermediate portions, and the pivot shafts 31 that connect the left and right pivot frames 17, 17 in the vehicle width direction are inserted through the pivot holes.

The vehicle body frame F includes a front cross frame 20 connecting the front portions of the frame rear portions 15d, 15d of the main frame body portions 15a, 15a in the vehicle width direction, and an intermediate frame connecting the upper ends of the pivot frames 17, 17 in the vehicle width direction. A side cross frame 21 and a lower cross frame 22 connecting the lower ends of the pivot frames 17, 17 in the vehicle width direction are provided.
The body frame F includes a rear cross frame 23 connecting the front portions of the seat frames 18, 18 in the vehicle width direction, and a rear end side cross frame connecting the rear ends of the seat frames 18, 18 in the vehicle width direction. and a cross frame 25 connecting the seat frames 18 , 18 in the vehicle width direction between the rear cross frame 23 and the rear end cross frame 24 .

The vehicle body frame F includes a front engine hanger 26 (FIG. 1) on the lower ends of the down frames 16, 16, an upper engine hanger 28 (FIG. 2) on the front cross frame 20, and rear main frame main bodies 15a, 15a. A rear engine hanger 29 is provided at the end and a lower engine hanger 30 is provided on the lower cross frame 22 .
As shown in FIG. 1 , the swing arm 12 has its front end supported by a pivot shaft 31 and swings up and down about the pivot shaft 31 . The rear wheel 3 is supported by a rear wheel axle 32 inserted through the rear end of the swing arm 12 .

The engine 10 is mounted so as to be suspended from the body frame F in front of the pivot frames 17 , 17 .
The engine 10 includes a crankcase 35 supporting a crankshaft (not shown) extending in the vehicle width direction, and a cylinder portion 36 extending forward and upward from the front portion of the crankcase 35 . The crankcase 35 is positioned below the frame rear portions 15d, 15d of the main frames 15, 15. As shown in FIG. The cylinder portion 36 extends forward and upward along the main frames 15 , 15 , and its front portion is positioned between the left and right down frames 16 , 16 and between the left and right connecting frames 19 , 19 . A transmission is accommodated in the rear portion of the crankcase 35 .

The engine 10 is supported by the vehicle body frame F via a front engine hanger 26 , an upper engine hanger 28 , a rear engine hanger 29 and a lower engine hanger 30 .
The engine 10 is an engine that is tilted forward so that the cylinder axis C of the cylinder portion 36 is closer to the horizontal side than vertical, and a space is secured above the engine 10 .
The output of the engine 10 is transmitted to the rear wheels 3 by a chain 37 wound between an output shaft (not shown) of the engine 10 and the rear wheels 3 .

An exhaust pipe 38 of the engine 10 is drawn downward from the cylinder head of the cylinder portion 36 , extends rearward under the engine 10 , and is connected to a muffler 39 on the right side of the swing arm 12 .
A purification device 41 for purifying intake air (outside air) supplied to the engine 10 is arranged above the front portions of the main frames 15 , 15 behind the head pipe 14 .
A radiator 42 of the engine 10 is arranged below the head pipe 14 and in front of the cylinder portion 36 .

The seat 13 integrally includes a front seat 44 for a driver (passenger) and a rear seat 45 for a passenger (passenger) one step higher than the front seat 44 . The seat 13 is rotatable up and down via a hinge 13a at the front end.
The front seat 44 is arranged above the rear portions of the main frames 15 and 15 and above the pivot frames 17 and 17 . Also, the front seat 44 is positioned above the rear portion of the crankcase 35 .
The rear seat 45 is arranged above the rear portions of the seat frames 18 , 18 . Grips 46 , 46 gripped by a passenger seated on the rear seat 45 are provided on the left and right sides of the rear seat 45 .

A pair of left and right plate-like step holders 47, 47 are provided on the outer surfaces of the pivot frames 17, 17, respectively. A pair of left and right sub-steps 48, 48 for the driver and a pair of left and right passenger steps 49, 49 for the passenger are supported by step holders 47, 47, respectively. A pair of left and right main steps 50 , 50 for the driver are provided forwardly and downwardly of the front seat 44 .
The main stand 51 is connected to lower portions of the pivot frames 17 , 17 . The side stand 52 is provided at the lower left end of the vehicle body frame F. As shown in FIG.

The motorcycle 1 includes a vehicle body cover 60 that covers the vehicle body. The vehicle body cover 60 includes a front cover 61 that covers the upper part of the head pipe 14 and the steering system 11 from the front, rear, left and right sides, and the main frames 15, 15 behind the lower part of the front cover 61 from above and from the left and right sides. An under-seat cover 62 and a pair of left and right intermediate side covers 63, 63 below the under-seat cover 62 and covering the engine 10 and the rear part of the vehicle body frame F from the sides.

The vehicle body cover 60 includes an under cover 64 that covers the engine 10 from below, a pair of left and right rear covers 65 that cover the side of the seat 13 behind the seat under cover 62, a lower portion of the rear portion of the engine 10, and a A pair of left and right frame covers 66, 66 are provided to cover the lower portions of the pivot frames 17, 17 from the sides.
Specifically, the front cover 61 includes a front cover 61a that covers the head pipe 14 and the upper portion of the steering system 11 from the front and left and right sides, and a rear cover 61b that covers the head pipe 14 and the upper portion of the steering system 11 from the rear. .
A plate-shaped windscreen 67 extending vertically is provided on the front cover 61a. The headlight 68 is provided on the front cover 61a.
The motorcycle 1 also includes a rear fender 54 covering the rear wheel 3 from above and a front fender 55 covering the front wheel 2 from above.

The front portion of the underseat cover 62 and the front portions of the intermediate side covers 63, 63 are vertically joined to form a central tunnel portion 69 having an inverted U-shaped cross section. The front portion of the body frame F and the cylinder portion 36 are housed inside the center tunnel portion 69 .
By arranging the upper surface of the center tunnel portion 69 at a position lower than the upper surface of the front seat 44, a downwardly recessed straddle portion 56 is formed between the front surface of the front seat 44 and the rear cover 61b. . A rider seated on the front seat 44 can put his/her feet through the straddle portion 56 when getting on and off the motorcycle 1, and can easily get on and off.

The fuel tank 57 is arranged below the front seat 44 and above the frame rear parts 15d, 15d. The fuel tank 57 has a filler port 57a on the upper surface of the front portion. A storage section (not shown) is provided behind the fuel tank 57 . When the seat 13 is opened upward via the hinge 13a, the fuel tank 57 and the storage section are exposed upward.
A fuel filler lid 44a (lid) that closes the opening is provided at the vehicle width direction central portion of the front end portion of the front side seat 44 . The fuel filler lid 44a is rotatable back and forth about a lower hinge 44d (see FIG. 2). When the fuel filler lid 44a is rotated toward the straddle portion 56 about the hinge portion 44d, the fuel filler port 57a is exposed from the opening. Therefore, even if the seat 13 is not opened, the fuel can be supplied from the fuel filler opening 57a by opening the fuel filler lid 44a. At this time, since the space of the straddle portion 56 can be used for refueling, workability is good.

FIG. 3 is a cross-sectional view along the center of the vehicle width direction of the motorcycle 1, showing the periphery of the steering system 11 and the cleaning device 41. As shown in FIG.
The steering system 11 includes a steering shaft 58 rotatably supported by the head pipe 14, and a pair of left and right front forks 70, 70 arranged on both left and right sides of the front wheel 2 (see FIG. 1) and supporting the front wheel 2. , a top bridge 71 fixed to the upper end of the steering shaft 58 and connecting the left and right front forks 70, 70, and a bottom bridge 72 fixed to the lower end of the steering shaft 58 and connecting the left and right front forks 70, 70. The steering system 11 also includes a bar handle 73 as steering provided above the front forks 70 , 70 and a handle post 74 fixing the bar handle 73 to the top bridge 71 .

As shown in FIG. 1, the front wheel 2 is pivotally supported on a front wheel axle 75 extending between the lower ends of the front forks 70,70.
A pair of left and right rearview mirrors 76 , 76 and a pair of left and right knuckle guards 77 , 77 are provided on the bar handle 73 .

As shown in FIGS. 1 and 3, a cleaning device 41 is arranged behind the head pipe 14 . The purification device 41 is housed inside the front cover 61 and positioned in front of the straddle portion 56 . Specifically, the purification device 41 is housed between the rear surface 14a of the head pipe 14 and the rear surface cover 61b.
The purification device 41 includes an air cleaner 81, a pair of left and right intake ducts 82, 82 for introducing outside air into the air cleaner 81, an intake sensor 83 for detecting the temperature of the intake air (air) taken into the air cleaner 81, and the air cleaner 81. and an air funnel 84 for leading purified intake air from.

The air cleaner 81 is formed in a vertically elongated box-like shape along the head pipe 14, and is arranged so as to tilt rearward as a whole. A lower portion of the air cleaner 81 is arranged between the left and right main frames 15 , 15 . An upper portion of the air cleaner 81 extends above the straddle portion 56 and is positioned behind the top bridge 71 and the handlebar post 74 .

The intake ducts 82 , 82 are connected to the upper portion of the air cleaner 81 and extend into the air cleaner 81 .
The air funnel 84 is connected to the lower portion of the air cleaner 81 . The air funnel 84 extends rearward and downward from the lower end of the air cleaner 81 and is connected to the upper end of the throttle body 33 . The throttle body 33 extends rearwardly and downwardly. A lower end of the throttle body 33 is connected to an intake port 36 a located on the upper surface of the cylinder portion 36 .

The air cleaner 81 has an air cleaner case 91 . The air cleaner case 91 is made of a resin material. The air cleaner case 91 includes a box-shaped first half 92 that opens rearward and a box-shaped second half 93 that opens forward. An air cleaner case 91 is formed by overlapping the open end of the first half 92 and the open end of the second half 93, and an internal space 94 is formed in the air cleaner case 91 through which intake air flows.

Between the first half body 92 and the second half body 93, an external plate-shaped air cleaner element (element) 95 extending in the vertical direction is arranged. The air cleaner element 95 partitions the internal space 94 in the front-rear direction. As a result, the air cleaner case 91 has a dirty side 94A, which is an internal space 94 on the side of the intake ducts 82, 82 with respect to the air cleaner element 95, and a clean side 94, which is an internal space 94 on the side of the air funnel 84 with respect to the air cleaner element 95. A side 94B is formed.
The dirty side 94</b>A is a space through which the intake air flows from the intake ducts 82 , 82 into the air cleaner case 91 before passing through the air cleaner element 95 . The clean side 94</b>B is a space in which the intake air purified by passing through the air cleaner element 95 flows inside the air cleaner case 91 .

FIG. 4 is a cross-sectional view of the purifying device 41 taken along the center of the lateral width. FIG. 5 is a rear view of the purification device 41. FIG. In the following description, directions such as front, back, left, and right are the same as the directions with respect to the purifier 41 shown in FIG. In the present embodiment, the front, rear, left, and right of the purification device 41 coincide with the front, rear, left, and right of the vehicle body. In addition, in the following description, only one reference numeral is given in principle even when a pair of right and left parts are provided.

The first half 92 of the present embodiment has a divided structure of a lower case 96 and an upper case 97 connected above the lower case 96 . The lower case 96 and the upper case 97 are manufactured separately at the manufacturing stage, but are integrated as the first half body 92 by welding or bonding before being assembled to the motorcycle 1 .

The lower case 96 is formed in a box shape with an open top. The lower case 96 includes a plate-like bottom portion 96A extending rearwardly and downwardly, a front wall portion 96B extending rearwardly upwardly from the front end of the bottom portion 96A, a rear wall portion 96C extending rearwardly upwardly from the rear end of the bottom portion 96A, and right and left sides of the bottom portion 96A. A pair of left and right side wall portions 96D are provided at both ends in the direction and connect the side ends of the front wall portion 96B and the side ends of the rear wall portion 96C.

A front wall portion 96B of the lower case 96 extends rearwardly upward substantially parallel to the rear surface 14a of the head pipe 14 in a side view (see FIG. 3). A rear wall portion 96C of the lower case 96 extends rearwardly upward substantially parallel to the front wall portion 96B. The rear wall portion 96C is formed lower than the front wall portion 96B with respect to the bottom portion 96A. Left and right side wall portions 96D of the lower case 96 widen in the left and right direction as they go upward.
The side wall portion 96D is positioned between the left and right reinforcing frame portions 15b, and the lower case 96 is fixed to the air cleaner case stay 34 (see FIG. 2) of the reinforcing frame portion 15b via a fixing member (not shown).

A bottom portion 96A of the lower case 96 is formed with a funnel fixing hole 96E penetrating in the thickness direction. The air funnel 84 is inserted and fixed in the funnel fixing hole 96E.

An upstream opening (upstream end) 84A is formed in the upper portion of the air funnel 84 . The upstream opening 84A opens toward the downstream end opening 82B of the intake duct 82 and opens toward the air cleaner element 95 . The upstream opening 84A expands in diameter as it approaches the air cleaner element 95. As shown in FIG. The upper end 84C of the air funnel 84 is located below the vertical central portion of the element main body 95C as the filter portion of the air cleaner element 95 . The air funnel 84 extends forward and downward inside the lower case 96 . The air funnel 84 curves rearward as it goes downward outside the lower case 96 after passing through the funnel fixing hole 96E. A downstream opening 84B is formed in the lower portion of the air funnel 84 . The downstream opening 84B is opened rearward and downward. The throttle body 33 is connected to the downstream opening 84B.

At the upper end of the lower case 96, an opening 96F that opens upward is formed by the surrounding shape of the front wall portion 96B, the rear wall portion 96C, and the pair of left and right side wall portions 96D. A flange portion 96</b>G is formed at the upper end of the lower case 96 so as to protrude outward.

An upper case 97 is connected to the upper end of the lower case 96 . The upper case 97 is formed in a tubular shape extending rearward and upward. The upper case 97 has a front wall portion 97B, a rear wall portion 97C, and a pair of left and right side wall portions 97D that extend corresponding to the front wall portion 96B, the rear wall portion 96C, and the pair of left and right side wall portions 96D of the lower case 96. Prepare.
At the lower end of the upper case 97, an opening 97F that opens downward is formed by the surrounding shape of the front wall portion 97B, the rear wall portion 97C, and the pair of left and right side wall portions 97D. A flange portion 97G is formed at the lower end of the upper case 97 and protrudes outward. The upper case 97 is integrated with the lower case 96 by fitting the flange portion 97G to the flange portion 96G of the lower case 96 .

The upper case 97 is located behind the top bridge 71 and the upper ends of the head pipe 14 in the side view shown in FIG. A front wall portion 97B of the upper case 97 extends along the rear surface 14a of the head pipe 14 .

The rear wall portion 97C of the upper case 97 curves forward as it goes upward, and extends to the position of the rear end of the front wall portion 97B. The curved shape of the rear wall portion 97C is convex forward. At the rear end of the upper case 97, a rear opening 97J that opens rearward is formed by a front wall portion 97B, a rear wall portion 97C, and a pair of left and right side wall portions 97D. The rear end of the upper case 97 is formed with a flange-shaped element mounting portion 97K that protrudes toward the inner peripheral side of the rear opening 97J. An air cleaner element 95 is attached to the element attachment portion 97K.

The air cleaner element 95 includes a frame-shaped support member 95A. An opening 95B is formed in the support member 95A. The opening 95B has an isosceles trapezoidal shape in which the upper side is longer than the lower side (see FIG. 6). An element body 95C as a filter is supported in the opening 95B. The element main body 95C is fitted in the opening 95B and supported in a state of protruding toward the dirty side 94A from the outer peripheral end of the support member 95A. A rear portion of the element body 95C forms a rear surface (surface) 95D of the air cleaner element 95. As shown in FIG. The rear surface 95D extends vertically.
The support member 95A of the air cleaner element 95 is attached to the element attachment portion 97K with a fixture (not shown).

A rear end of the upper case 97 is formed with a flange-shaped half mounting portion 97L projecting outward. A plurality of the half mounting portions 97L are provided on the outer peripheral portion. A fastening member 111 fastens the second half 93 to the half mounting portion 97L.
A first half body 92 is composed of the lower case 96 and the upper case 97 . An air cleaner case 91 is composed of the first half 92 and the second half 93 .

FIG. 6 is a front view of the second half body 93 as seen from the front. FIG. 7 is a perspective view of the second half 93 as seen from the front left.
The upper portion of the second half 93 is located behind the handle post 74 (see FIG. 3). The second half body 93 is formed in a box shape recessed rearward. The second half 93 is formed symmetrically. The second half 93 includes a bottom wall portion 98 corresponding to the bottom portion of the box, and a peripheral wall portion 99 formed on the outer peripheral portion of the bottom wall portion 98 and extending forward.

The bottom wall portion 98 includes a bottom wall central portion 98A. The bottom wall central portion 98A inclines forward as it goes downward. As shown in FIG. 4, the bottom wall central portion 98A includes an upper portion 98A1 that extends steeply in the vertical direction and a lower portion 98A2 that slopes more gently than the upper portion 98A1. A pair of left and right bottom wall side portions 98B are formed on both left and right sides of the bottom wall central portion 98A. The bottom wall side portions 98B, 98B curve forward as they extend outward in the left-right direction, and front end portions extend forward. A bottom wall upper portion 98C is formed above the bottom wall central portion 98A and the pair of left and right bottom wall side portions 98B. The bottom wall upper portion 98C closes off the upper portions of the bottom wall central portion 98A and the bottom wall side portions 98B.

As shown in FIGS. 6 and 7, peripheral wall portions 99 projecting forward are formed at the outer peripheral ends of the bottom wall central portion 98A, the bottom wall side portions 98B, and the bottom wall upper portion 98C. The front ends of the peripheral wall portion 99 are aligned in the front-rear direction (see FIG. 4), and the surrounding shape of the peripheral wall portion 99 forms a front opening 99F (see FIG. 7) that opens to the front of the second half body 93. be.

The peripheral wall portion 99 includes a peripheral wall upper portion 99A extending in the left-right direction. A pair of left and right peripheral wall widening portions 99B extending laterally outward after extending slightly downward are formed at both lateral ends of the peripheral wall upper portion 99A. A pair of left and right peripheral wall side portions 99C extending downward are formed at the left and right outer ends of the widened peripheral wall portion 99B. The peripheral wall side portion 99C extends linearly while being inclined inward in the left-right direction as it goes downward. A lower end portion 99D of the peripheral wall side portion 99C is arranged at a predetermined interval. By separating the lower end portions 99D of the left and right peripheral wall side portions 99C, an open drain hole 99E is formed by the lower end portions 99D of the pair of left and right peripheral wall side portions 99C and the bottom wall central portion 98A. . Drain hole 99E is located below dirty side 94A. Water (liquid) may enter the dirty side 94A when the vehicle is washed or when the vehicle is driven in the rain, but the water can be discharged through the drain hole 99E.

A recessed groove 99G (see FIG. 4) recessed rearward is formed at the front end of the peripheral wall portion 99. As shown in FIG. The groove 99</b>G extends along the circumferential shape of the peripheral wall portion 99 . A seal member 110 is supported in the concave groove 99G. A plurality of fixing portions 99</b>H are formed on the outer peripheral portion of the peripheral wall portion 99 . The fixing portion 99</b>H is fastened to the half mounting portion 97</b>L of the first half 92 by a fastening member 111 . At this time, the seal member 110 is in close contact with the air cleaner element 95 to seal the dirty side 94A at the seal member 110 portion.

As shown in FIG. 5, a pair of left and right duct fixing portions 100 are formed on the upper portion 98C of the bottom wall of the second half 93. As shown in FIG. The duct fixing portion 100 is formed in the shape of a flat plate that slopes downward toward the outside in the left-right direction. A duct fixing hole (not shown) is formed through the duct fixing portion 100 in the thickness direction.

The intake duct 82 is arranged to extend from the outside of the air cleaner case 91 into the dirty side 94A. Outside air is introduced into the dirty side 94</b>A as the internal space of the second half 93 through the intake duct 82 .

When viewed from the front as shown in FIG. 6, the air intake duct 82 curves downward as it goes inward in the left-right direction. An upstream end opening (upstream end) 82A of the air intake duct 82 opens laterally outward and slightly rearward (see FIG. 5). An upstream end opening (upstream end) 82</b>A opens inside the front cover 61 outside the air cleaner case 91 . The air intake duct 82 extends vertically inside the air cleaner case 91 and extends into the dirty side 94</b>A along the rear surface 95</b>D of the air cleaner element 95 . A downstream end opening (downstream end) 82B of the intake duct 82 faces downward and opens toward the upstream opening 84A of the air funnel 84 . The downstream end opening 82B is arranged at a position facing the element body 95C of the air cleaner element 95 (see FIG. 4).

The downstream end opening 82B of this embodiment is formed in an elliptical shape obtained by obliquely cutting a cylinder. (See Figure 4). The downstream end opening 82B of the intake duct 82 is provided at a position where the downstream end opening 82B and the drain hole 99E partially overlap in the front-rear direction and the left-right direction. Therefore, there is a drain hole 99E below where the intake air introduced from the downstream end opening 82B of the intake duct 82 tends to move due to inertia.

In particular, in the present embodiment, the downstream end opening 82B, in the side view shown in FIG. The drain hole 99E is located on a region sandwiched between the extension line L2 in the tangential direction of the air intake duct 82 at .

6, the downstream end opening 82B has a tangential extension line L3 of the intake duct 82 at the laterally outer end 82E of the downstream end opening 82B and a laterally inner end 82F of the downstream end opening 82B. The drain hole 99E is positioned on a region sandwiched between the extension line L4 in the tangential direction of the air intake duct 82 and the drain hole 99E.

A downwardly recessed sensor fixing portion 101 is formed behind the duct fixing portion 100 . The sensor fixing portion 101 is formed between the left and right duct fixing portions 100 . An intake sensor 83 (see FIG. 3) is fixed to the sensor fixing portion 101 . The intake sensor 83 is arranged between the left and right intake ducts 82 . The intake sensor 83 is inserted into the second half 93 and detects the temperature of the intake air in the wide space between the left and right intake ducts 82 on the dirty side 94A.

As shown in FIGS. 4, 6 and 7, the bottom wall portion 98 of the second half 93 is formed with a rectifying wall 102 . The straightening wall 102 guides the intake air introduced from the downstream end opening 82B of the intake duct 82 toward the rear surface 95D of the air cleaner element 95. As shown in FIG.

As shown in FIG. 4 , the rectifying wall 102 protrudes forward in a V-shaped cross section from the inner surface of the bottom wall portion 98 facing the air cleaner element 95 . The straightening wall 102 is formed to face the central portion in the vertical direction of the element body 95C. The straightening wall 102 is formed between the upper portion 98A1 and the lower portion 98A2 of the bottom wall center portion 98A of the bottom wall portion 98 . The straightening wall 102 includes upper surfaces 102A and 102B and a lower surface 102C that form a V-shaped cross section. Upper surfaces 102A and 102B of the straightening wall 102 are inclined downward toward the front. A lower surface 102C of the straightening wall 102 has a smaller inclination with respect to the vertical direction than the upper surfaces 102A and 102B, and extends substantially in the front-rear direction.

The side of the straightening wall 102 on which the intake duct 82 is arranged, that is, the upper surfaces 102A and 102B of the straightening wall 102 have an R shape in a side view, and the inclination angle becomes gentler downward. Therefore, it is possible to direct the intake air toward the element main body 95C side while suppressing the pressure loss of the intake air. Further, the straightening wall 102 is provided on the tangential extension line L2 at the rear end 82D of the downstream end opening 82B of the air intake duct 82 . Therefore, the rectifying wall 102 is arranged at a position where the intake air introduced from the downstream end opening 82B of the intake duct 82 can easily pass by inertia, and the direction of the intake air can be efficiently directed toward the element main body 95C. can.

In the front view shown in FIG. 6 , the straightening wall 102 is provided with a wide width along the direction intersecting with the extending direction of the air intake duct 82 . In the present embodiment, as an example, straightening wall 102 is provided wide along a direction orthogonal to the extending direction of intake duct 82 . The rectifying wall 102 is provided in an arc shape that is concave on the intake duct 82 side. More specifically, the straightening wall 102 has a central upper surface 102A that extends laterally below the downstream end opening 82B of the intake duct 82 . Further, the straightening wall 102 includes a pair of left and right side upper surfaces 102B which are continuously formed on the left and right sides of the central upper surface 102A and positioned laterally outside of the downstream end opening 82B. The side upper surface 102B slopes upward toward the outside in the left-right direction. Therefore, when the intake air from the intake duct 82 spreads outward in the left-right direction, the intake air can be guided upward. Further, it is possible to direct the intake air to the element main body 95C in a wider range.

A pair of left and right second straightening walls 103 extending in a direction intersecting the straightening wall 102 is provided on an extension line in the horizontal direction along the straightening wall 102 . In the present embodiment, as an example, the second straightening wall 103 extends in a direction perpendicular to the straightening wall 102 . The second straightening wall 103 protrudes forward from the inner surface of the bottom wall side portion 98B. The second straightening wall 103 extends in an upwardly convex arc shape. The amount of protrusion of the second straightening wall 103 is set so that the main body portion 103A, which is aligned with the extension line of the straightening wall 102, is large, and the amount of protrusion of the left-right direction outer end portion 103B is set smaller than that of the main body portion 103A. A duct avoiding portion 103</b>C that is cut out in an arc shape is formed at the inner end of the second straightening wall 103 in the left-right direction. The intake duct 82 is arranged in the duct avoidance portion 103C in a state of being spaced apart from the second straightening wall 103 . Intake air can move in the gap between the second straightening wall 103 and the intake duct 82 .

FIG. 8 is an enlarged view of the periphery of the drain hole 99E in FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8. FIG.
A projecting wall 104 is provided above the drain hole 99E. The protruding wall 104 protrudes forward from the lower end of the inner surface of the central bottom wall portion 98A. The protruding wall 104 covers the top of the drain hole 99E. The projecting wall 104 extends in the left-right direction and is inclined downward toward the left and right ends. In this embodiment, the projecting wall 104 is formed in an inverted V shape. The projecting wall 104 includes a top portion 104A, a pair of left and right inclined portions 104B that linearly slope downward from the top portion 104A toward the outside in the left-right direction, and a reinforcing portion 104D that extends downward from the top portion 104A.
In the present embodiment, the drain hole 99E is partitioned left and right by the reinforcing portion 104D. The drain hole 99E has a pair of left and right drain holes 99E1.

As shown in FIG. 4, the top portion 104A of the protruding wall 104 extends below the element body 95C, and overlaps the element body 95C in the front-rear direction. The protruding wall 104 is arranged close to the support member 95A of the air cleaner element 95 from the rear (see FIG. 9). Since the lower portion of the element body 95C extends in the left-right direction (see FIG. 6), there is a gap that allows drainage between the element body 95C and the inclined portion 104B.

As shown in FIGS. 8 and 9, the projecting wall 104 is formed to be larger than the lateral width of the drain hole 99E. In this embodiment, the inclined portion 104B is connected to the peripheral wall side portion 99C. In particular, the inclined portion 104B is connected to the peripheral wall side portion 99C above the lower end portion 99D of the peripheral wall side portion 99C. As a result, the drain hole 99E is covered with the projecting wall 104 above. Also, the periphery of the drain hole 99E is covered with the projecting wall 104, the peripheral wall side portion 99C, and the bottom wall central portion 98A. Therefore, the drain hole 99E is likely to be isolated from the dirty side 94A on the intake duct 82 side by the projecting wall 104 interposed between the drain hole 99E and the intake duct 82 .

A notch 104C is formed by notching the front end of the inclined portion 104B rearward in the left-right direction. The pair of left and right cutouts 104C are offset from the drain hole 99E in the left-right direction. In this embodiment, the notch 104C partially overlaps the peripheral wall side portion 99C in the front-rear direction (see FIG. 9). The notch 104C allows communication between the dirty side 94A and the drain hole 99E.

In the purifying device 41 , when the piston (not shown) of the engine 10 moves and the cylinder portion 36 becomes negative pressure, the suction force of the negative pressure introduces intake air into the air cleaner case 91 through the intake duct 82 .
Generally, since intake air continues to move due to inertia, intake air may be introduced into the air cleaner case 91 through the intake duct 82 even when the pressure in the cylinder portion 36 is not negative.

In the purifier 41 of the present embodiment, the downstream end opening 82B of the air intake duct 82 opens downward, and the intake air introduced into the dirty side 94A from the downstream end opening 82B moves toward the rear surface 95D of the air cleaner element 95 due to inertia. It is easy to introduce in the direction along. In particular, the intake duct 82 of the present embodiment extends downward along the vertical direction on the downstream side, and the intake air introduced from the downstream end opening 82B tends to flow downward due to inertia.

In the present embodiment, a rectifying wall 102 is provided at a position through which intake air can easily pass, and the intake air, which tends to move downward due to inertia, is guided by the rectifying wall 102 in a direction orthogonal to the rear surface 95D of the air cleaner element 95. be. Therefore, the inertia of the intake air allows the intake air to pass through the air cleaner element 95 and be introduced to the clean side 94B, thereby improving the intake efficiency.

In particular, since the upper surfaces 102A and 102B of the straightening wall 102 have an R shape in a side view, the intake air is directed toward the element body 95C and can pass through the element body 95C while suppressing the pressure loss of the intake air.

Further, as shown in FIG. 5, when the intake air is guided by the rectifying wall 102, the intake air moves toward the air cleaner element 95 and moves in the horizontal direction. Of the intake air that has moved in the left-right direction, the intake air guided by the side upper surface 102B of the straightening wall 102 reaches the body portion 103A of the second straightening wall 103 in the extending direction of the side upper surface 102B. The intake air that has reached the main body portion 103A is guided along the second rectifying wall 103, and as indicated by the arrow A1, moves upward in the dirty side 94A inside the second rectifying wall 103 in the left-right direction. .

Among the intake air that has moved in the left-right direction, the intake air that reaches the left-right outer end portion 103B of the second rectifying wall 103 easily crosses over the second straightening wall 103 because the amount of protrusion of the left-right outer end portion 103B is small. , as indicated by an arrow A2, it is easier to move further upward within the dirty side 94A. In addition, in the duct avoidance portion 103C of the second straightening wall 103, the intake air easily moves beyond the second straightening wall 103 through the space between the intake duct 82 and the duct avoidance portion 103C.

Therefore, the rectifying wall 102 and the second rectifying wall 103 easily guide the intake air throughout the dirty side 94A, so that the area of the air cleaner element 95 can be effectively used.

Further, with a simple structure in which the straightening wall 102 protrudes from the bottom wall portion 98 of the second half body 93, the intake air can be directed toward the air cleaner element 95 side.

4, the downstream end opening 82B of the air intake duct 82 opens toward the upstream opening 84A of the air funnel 84, and the upstream opening 84A of the air funnel 84 opens toward the downstream end opening 82B of the air intake duct 82. It is open. Therefore, the intake air introduced from the intake duct 82 is more smoothly introduced into the air funnel 84 .

In addition, in the purifier 41 of the present embodiment, the intake air introduced from the downstream end opening 82B tends to flow downward due to inertia, so it tends to flow toward the drain hole 99E located below. In this embodiment, since the upper part of the drain hole 99E is covered with the protruding wall 104, the downward movement of the intake air toward the drain hole 99E is suppressed by the protruding wall 104. It is easy to be guided upward. Therefore, it is possible to prevent the intake air entering from the intake duct 82 from flowing out of the drain hole 99E without entering the air cleaner element 95 due to inertia. As a result, loss of intake air in the air cleaner 81 is reduced, thereby improving followability to changes in the required intake air amount due to throttle operation.

In addition, since the projecting wall 104 has an inverted V shape, water can be easily guided left and right along the projecting wall 104 by its own weight. Water guided to the left and right can move to the drain hole 99E through the notch 104C, and can be discharged to the outside of the air cleaner case 91 through the drain hole 99E. In particular, since the notch 104C is offset from the drain hole 99E in the left-right direction, the protruding wall 104 can suppress the passage of intake air and allow water to be discharged from the drain hole 99E through the notch 104C.

In the present embodiment, the downstream end opening 82B of the air intake duct 82 and the drain hole 99E are provided at positions that partially overlap in the left-right direction and the front-rear direction, and the protruding wall 104 is located between the downstream end opening 82B and the drain hole 99E. provided in an intervening position. Therefore, even in an arrangement in which the intake air easily moves to the drain hole 99E, the projecting wall 104 can effectively suppress the intake air from being discharged from the drain hole 99E.

FIG. 10 is a diagram showing CFD analysis results of the intake air in the air cleaner case 91. As shown in FIG.
In FIG. 10, the denser the dots, the faster the flow velocity. As shown in FIG. 10 , according to CFD (Computational Fluid Dynamics) analysis results, the intake air introduced from the intake duct 82 is guided to the rectifying wall 102 when moving downward along the surface of the air cleaner element 95 . is confirmed to move forward. In particular, it is confirmed that the flow velocity is maintained at the upper surfaces 102A and 102B that are greatly inclined with respect to the front-rear direction. In addition, although the intake air directed forward by the rectifying wall 102 also moves downward, it is suppressed from moving to the drain hole 99E by the protruding wall 104. It is confirmed that it is easier to move to 94B.

As described above, according to this embodiment to which the present invention is applied, the first half 92 and the second half 93 are partitioned by the air cleaner element 95 to form the clean side 94B and the dirty side 94A. , and an air intake duct 82 for introducing outside air into the dirty side 94A. A rectifying wall 102 is provided inside to guide the intake air introduced from the downstream end opening 82B of the intake duct 82 toward the rear surface 95D of the air cleaner element 95 . Therefore, the intake air introduced into the dirty side 94A from the downstream end opening 82B of the intake duct 82 is introduced along the rear surface 95D of the air cleaner element 95 by inertia, but the intake air is directed along the rear surface 95D of the air cleaner element 95 by the straightening wall 102. The intake air can be guided toward 95D and introduced to the clean side 94B by the inertia of the intake air, thereby improving the intake efficiency.

In the present embodiment, the downstream end opening 82B opens in a direction along the rear surface 95D of the air cleaner element 95, and the straightening wall 102 extends from the wall surface of the bottom wall portion 98 of the second half 93 facing the air cleaner element 95. It is formed by protruding in the direction of the air cleaner element 95 . Therefore, since the rectifying wall 102 is formed by protruding from the second half 93 toward the rear surface 95D of the air cleaner element 95, it is possible to direct the intake air toward the air cleaner element 95 with a simple structure. can.

Further, in the present embodiment, upper surfaces 102A and 102B of straightening wall 102 on the side where intake duct 82 is arranged have an R shape. Therefore, it is possible to direct the intake air toward the air cleaner element 95 side while suppressing the pressure loss of the intake air.

Further, in the present embodiment, the straightening wall 102 is provided at a position overlapping the tangential extension line L2 of the downstream end opening 82B of the intake duct 82 in the front-rear direction. Therefore, the direction of intake air can be directed toward the air cleaner element 95 side efficiently.

Further, in the present embodiment, straightening wall 102 is provided with a wide width along a direction perpendicular to the extending direction of intake duct 82 . Therefore, it is possible to direct the intake air over a wide range of the air cleaner element 95 .

Further, in the present embodiment, the rectifying wall 102 is provided in an arc shape that is concave on the intake duct 82 side. Therefore, the intake air can be directed to a wider area of the air cleaner element 95 .

Further, in the present embodiment, a second rectifying wall 103 extending in a direction perpendicular to the rectifying wall 102 is provided on the extended line of the end of the rectifying wall 102 . Therefore, the intake air directed in the wide direction of the rectifying wall 102 , that is, in the lateral direction can be directed toward the air cleaner element 95 by the second rectifying wall 103 .

Further, in the present embodiment, the first half 92 has an air funnel 84 for leading intake air from the clean side 94B, and the upstream opening 84A of the air funnel 84 opens toward the downstream end opening 82B of the intake duct 82. , the downstream end opening 82B of the intake duct 82 opens toward the upstream opening 84A of the air funnel 84 . Therefore, the intake air introduced from the intake duct 82 can be more smoothly introduced into the air funnel 84 .

Further, as described above, according to the present embodiment to which the present invention is applied, the air cleaner in which the first half 92 and the second half 93 are partitioned by the air cleaner element 95 to form the clean side 94B and the dirty side 94A. 81, an intake duct 82 for introducing outside air into the dirty side 94A, and a drain hole 99E formed below the dirty side 94A, the intake duct 82 is disposed within the dirty side 94A. At the same time, the downstream end opening 82B of the air intake duct 82 opens downward, and the drain hole 99E is covered with a projecting wall 104 extending in the left-right direction. Therefore, the intake air introduced into the dirty side 94A from the downstream end opening 82B of the intake duct 82 is directed downward by inertia to the drain hole 99E, but the protruding wall 104 suppresses the intake air from being discharged from the drain hole 99E. A decrease in intake efficiency can be suppressed.

In this embodiment, the protruding wall 104 is arranged so as to be located downward toward the left and right ends. Therefore, the inclined protruding wall 104 can change the direction of the intake air having a flow velocity while suppressing a decrease in the flow velocity, thereby preventing the intake air from going to the drain hole 99E.

Further, in this embodiment, the projecting wall 104 is larger than the lateral width of the drain hole 99E. Therefore, it is possible to suppress more of the intake air from going toward the drain hole 99E.

Further, in this embodiment, the drain hole 99E is surrounded by the projecting wall 104 and the second half body 93 . Therefore, it is possible to suppress more of the intake air from going toward the drain hole 99E.

Further, in the present embodiment, the protruding wall 104 is provided with a notch 104C, and the notch 104C is offset from the drain hole 99E in the left-right direction. Therefore, even with the projecting wall 104, water (liquid) can pass through the notch 104C and be discharged from the drain hole 99E.

In the present embodiment, the downstream end opening 82B of the air intake duct 82 and the drain hole 99E are provided at positions that partially overlap in the left-right direction and the front-rear direction, and the protruding wall 104 is located between the downstream end opening 82B and the drain hole 99E. provided in an intervening position. Therefore, when the air cleaner 81 is compactly formed in the left-right direction or the front-rear direction, more of the intake air may be discharged from the drain hole 99E. can be suppressed.

The embodiment described above merely shows one aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.
In the above embodiment, the motorcycle 1 was described as an example of a saddle-ride type vehicle, but the present invention is not limited to this, and the present invention is a three-wheeled vehicle having two front wheels or two rear wheels. saddle type vehicle and a saddle type vehicle having four or more wheels.

In the above embodiment, the left-right direction and the front-rear direction of the purification device 41 are aligned with the left-right direction and the front-rear direction of the motorcycle 1 . However, for example, the purification device 41 may be rotated around an axis extending in the vertical direction and attached to the motorcycle 1 , or the front, rear, left, and right of the purification device 41 may not coincide with the front, rear, left, and right of the motorcycle 1 .

In the above embodiment, the protruding wall 104 covers the entire drain hole 99E from above, but the protruding wall 104 may cover at least a portion of the drain hole 99E.

In the above-described embodiment, the downstream end opening 82B of the air intake duct 82 and the drain hole 99E are provided at positions partially overlapping each other in the front-rear direction and the left-right direction. However, the downstream end opening 82B of the intake duct 82 and the drain hole 99E may be provided at positions partially overlapping in the front-rear direction or the left-right direction.

81 air cleaner 82 intake duct 82B downstream end opening (downstream end)
84 air funnel 84A upstream opening (upstream end)
92 First half 93 Second half 94A Dirty side 94B Clean side 95 Air cleaner element (element)
95D rear surface (surface)
102 straightening wall 103 second straightening wall L2 extension line

Claims (6)

an air cleaner (81) having a first half (92) and a second half (93) defined by an element (95) to form a clean side (94B) and a dirty side (94A); A purifier comprising an intake duct (82) for introducing outside air into the
the intake duct (82) is arranged to extend into the dirty side (94A) along the surface (95D) of the element (95);
Inside the dirty side (94A), there is a straightening wall (102) that guides the intake air introduced from the downstream end (82B) of the intake duct (82) toward the surface (95D) of the element (95). is provided,
The straightening wall (102) is provided with a wide width along a direction intersecting with the extending direction of the intake duct (82),
A purifier, wherein a second straightening wall (103) extending in a direction intersecting the extension of the straightening wall (102) is provided on an extension line of an end of the straightening wall (102). The downstream end (82B) opens along the surface (95D) of the element (95),
The rectifying wall (102) is formed by protruding in the direction of the element (95) from a wall surface of the second half (93) facing the element (95). Purification device according to. The purification device according to claim 1 or 2, wherein a side of the rectifying wall (102) on which the intake duct (82) is arranged has an R shape. 4. The rectifying wall (102) is provided at a position overlapping a tangential extension line (L2) of the downstream end (82B) of the intake duct (82) in the longitudinal direction. Purification device according to any one of the. The purifier according to any one of claims 1 to 4, wherein the rectifying wall (102) is provided in an arcuate shape that is concave on the intake duct (82) side. The first half (92) has an air funnel (84) for leading intake air from the clean side (94B),
The upstream end (84A) of the air funnel (84) opens toward the downstream end (82B) of the intake duct (82),
The downstream end (82B) of the air intake duct (82) opens toward the upstream end (84A) of the air funnel (84) according to any one of claims 1 to 5. purifier.

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