JP5113103B2 - Air cleaner box structure - Google Patents

Description

  The present invention relates to an air cleaner box structure suitable for a saddle-ride type vehicle such as a motorcycle.

  Conventionally, in the above air cleaner box structure, an air cleaner case (intake chamber) that houses an air cleaner element includes a case body that opens on one side, and a case cover that closes the opening of the case body. There is a bottom wall located on the opposite side of the opening and a side wall rising from the outer periphery of the bottom wall, and a boss for attaching the case cover with a screw is provided in the vicinity of the side wall ( For example, see Patent Document 1.)

JP 2002-213111 A

  By the way, in the said prior art, since the said boss | hub is arrange | positioned outside the said side wall, the shape of a side wall tends to become complicated with the said boss | hub, and consideration to the external appearance of an air cleaner case is desired. On the other hand, if the boss is disposed inside the side wall, the air flow in the air cleaner case may be hindered.

  Accordingly, an object of the present invention is to improve the appearance of the air cleaner case and smooth the air flow in the air cleaner case in an air cleaner box structure provided with a boss for attaching a case cover to the outer periphery of the case body. And

As a means for solving the above problems, the invention described in claim 1 is an intake chamber (for example, an air cleaner case of the embodiment) having an intake port (for example, the intake port 61 of the embodiment) and an exhaust port (for example, the exhaust port 62 of the embodiment). 51) includes a chamber body (for example, the case body 54 of the embodiment) that opens on one side, and a cover (for example, the case cover 55 of the embodiment) that closes the opening (for example, the opening 54a of the embodiment) of the chamber body. The chamber body includes a bottom wall (for example, the bottom wall 56 of the embodiment) located on the opposite side to the opening, and a side wall (for example, the side wall 57 of the embodiment) that rises from the outer periphery of the bottom wall to the opening side. And an end portion of the side wall is provided with a mating portion (for example, the mating portion 66 of the embodiment) with the cover, and a boss (in the vicinity of the mating portion) for fastening the cover. For example, in the air cleaner box structure in which the bosses 71a to 71f) of the embodiment are provided, the boss is arranged inside the case with respect to the side wall, and the side of the side wall of the case is gradually approached from the boss to the side wall. A rib (for example, rib 73 in the embodiment) that extends and connects the tip end side to the side wall is provided.
The invention described in claim 2 is characterized in that the end portion of the rib on the boss side is connected to the side surface of the boss opposite to the side wall.
According to a third aspect of the present invention, the cover includes a cover bottom wall (for example, the cover bottom wall 58 of the embodiment) facing the opening, and a cover side wall (for example, implementation) rising from the outer periphery of the cover bottom wall to the opening side. The cover side boss (for example, the cover side bosses 72a to 72f in the embodiment) and the cover side rib (for example, the embodiment) facing the boss and the rib are disposed inside the case of the cover side wall. The cover side rib 74) is provided.
The invention described in claim 4 is characterized in that the rib and the cover-side rib are arranged so as to leave a gap (for example, the gap S3 in the embodiment) between the end portions thereof.
According to a fifth aspect of the present invention, a wall plate (for example, the guide wall 68 of the embodiment) is provided in the intake chamber so as to bypass the air flow path from the intake port to the discharge port along the side wall. The ribs having the ribs (for example, the bosses 71b, 71c, 72b, 72c in the embodiment) are arranged on the outer peripheral side of the detour channel (for example, the detour channel R2 in the embodiment). .

According to the first aspect of the present invention, the side wall and hence the outer peripheral side of the intake chamber can be formed smoothly, and the appearance of the intake chamber can be improved. By providing ribs that gradually approach the side wall from the boss inside the side wall, the air flowing along the side wall in the intake chamber can flow smoothly around the boss, and the air flow in the intake chamber can be made smooth. Can be. In addition, the boss is reinforced with ribs, and the strength and size of the boss can be minimized.
According to the second aspect of the present invention, the air flowing along the side wall in the intake chamber can easily get over the boss, and the flow of air in the intake chamber can be made smoother.
According to the third aspect of the present invention, the air flow in the intake chamber can be further smoothed.
According to the fourth aspect of the present invention, the space formed between each rib and the side wall can be used as a resonator, and intake noise can be reduced.
According to the fifth aspect of the present invention, by diverting the air flowing in the intake chamber, dust or the like in the air can easily fall in the intake chamber. Further, by arranging the boss having the rib on the outer peripheral side where the air in the bypass channel flows more densely, the effect of smoothing the air flow in the intake chamber is enhanced.

1 is a left side view of a scooter type motorcycle according to an embodiment of the present invention. FIG. 3 is a left side view showing a state in which a riding seat and a rear cover are rotated upward in the motorcycle. It is a left view of the air cleaner box of the motorcycle. It is a top view of the air cleaner box. It is AA sectional drawing of FIG. It is a left view of the case main body of the said air cleaner case. It is a left view of the case cover of the said air cleaner case. It is the perspective view which looked at the said case main body from the case inner side. It is the perspective view which looked at the said case cover from the case inner side.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle unless otherwise specified. In the figure, the arrow FR indicates the front of the vehicle, the arrow LH indicates the left side of the vehicle, and the arrow UP indicates the upper side of the vehicle.

  A scooter type motorcycle (scooter type vehicle) 1 shown in FIGS. 1 and 2 includes a front wheel WF that is steered by a bar handle 12 and a rear wheel WR that is driven by a swing unit P. Steering system parts including the bar handle 12 and the front wheel WF are pivotally supported by the head pipe 13 at the front end of the body frame F so as to be steerable. On the lower rear side of the vehicle body frame F, the front lower side of the swing unit P is pivotally supported so as to be vertically swingable. A space between the bar handle 12 and the saddle riding seat 30 that is supported on the rear part of the vehicle body is a relatively low vehicle height. Left and right step floors 45 on which the occupant's feet seated on the seat 30 are placed are provided on both the left and right sides of the straddle portion.

  The vehicle body frame F is formed by integrally joining a plurality of types of steel materials by welding or the like, and the head pipe 13 located at the front end thereof, and extends obliquely downward and rearward from the head pipe 13 and then rearwardly below the front portion of the vehicle body. One main frame 14 that extends in a curved manner, a cross frame 15 that extends to the left and right at the lower rear side of the vehicle body, and that joins the rear end of the main frame 14 to the left and right intermediate portions thereof, and the left and right sides of the cross frame 15 The left and right rear frames 16 that extend obliquely upward and rearward from the rear portion and then bend rearwardly on the upper rear side of the vehicle body and the left and right pivot brackets 17 joined to the left and right side portions of the cross frame 15 are mainly used.

  The swing unit P is a swing type power unit in which a front engine E and a rear left power transmission mechanism M are integrated, and the front part can swing up and down on a left and right pivot bracket 17 via a suspension link 18. Supported by A rear cushion 19 is disposed between the rear part of the power transmission mechanism M and the front and rear intermediate part of the left rear frame 16, and thus a unit swing type rear suspension is formed at the rear part of the vehicle body.

The engine E (internal combustion engine) has a cylinder projecting from the front end portion of the crankcase to the front and substantially horizontally (in detail, slightly upward). A case front portion of a power transmission mechanism M extending rearward is integrally provided on the left side portion of the crankcase.
On the right side of the rear part of the power transmission mechanism M, the rear wheel axle projects rightward (to the vehicle body center side), and the rear wheel WR is supported by the rear wheel axle. The rotational power of the engine E is transmitted to the rear wheel axle via the power transmission mechanism M, and the rear wheel WR is driven to drive the motorcycle 1.

  A carburetor (or throttle body) 27 is disposed above the cylinder, and an air cleaner box 28 is disposed behind the carburetor 27. The outside air sucked into the air cleaner box 28 and filtered is supplied to the engine E through the carburetor 27 as an air-fuel mixture. From the cylinder, an exhaust pipe 29 is curved and extended from below to the rear, and the exhaust pipe 29 is connected to a silencer 29a disposed on the right side of the rear wheel WR.

  An article storage box 24 supported at the front portion of the rear frame 16 is disposed above the engine E, and a fuel tank 25 supported at the rear portion of the rear frame is disposed behind the article storage box 24. Is done. The article storage box 24 and the fuel tank 25 are covered from above with a tandem riding seat 30. The front end of the riding seat 30 is connected to the upper part of the front end of the article storage box 24 via a hinge 31. The riding seat 30 is pivotally supported by the article storage box 24 via the hinge 31 so as to move the rear portion thereof upward, and by turning the riding seat 30 upward. The article storage box 24 and the fuel tank 25 can be accessed.

  A part of the vehicle body frame F and the power unit P is covered with a vehicle body cover 40. The vehicle body cover 40 includes a synthetic resin front cover 42 having a leg shield 41 covering the driver's legs sitting on the rider's seat 30 from the front, and a rear lower end of the leg shield 41 for placing the driver's feet. A continuous floor cover 43 and a synthetic resin rear cover 44 connected to the rear upper part of the step floor 45 so as to cover a part of the power unit P, the article storage box 24 and the fuel tank 25 from the side are provided. On the rear cover 44, the riding seat 30 that is hingedly supported by the article storage box 24 and is in a closed state is placed.

  The floor cover 43 is formed of metal (for example, a steel plate), and floor side covers 46 are continuously provided on both sides of the step floor 45 on which the driver puts his / her foot. In this embodiment, the step floor 45 and the floor side cover 46, which are separate members, are connected to form the floor cover 43. However, the floor cover 43 may be integrally formed.

  The rear cover 44 is rotatably supported by a hinge portion 71 provided between the rear ends of the rear frame 16. Accordingly, when the riding seat 30 is opened and the support and fixing state of the article storage box 24 to the front portion of the rear frame 16 is released, the riding seat 30 placed on the rear cover 44 and the riding seat 30 are connected. The article storage box 24 in a state of being turned can be rotated together with the rear cover 44 to open the upper side of the power unit P. In addition, a rod 47 that supports the riding seat 30 and the rear cover 44 in the upward rotation position is attached to the cross frame 20 between the front portions of the rear frame 16 in the vehicle body frame F so as to be retractable.

  The air cleaner box 28 is fixedly supported immediately above the power transmission mechanism on the left side of the rear part of the vehicle body, and is generally covered by the rear cover 44 when the rear cover 44 is rotated downward. In the state of being rotated, the whole is exposed to the outside, and the maintenance thereof becomes possible.

As shown in FIGS. 3 and 4, the air cleaner box 28 includes a hollow box type air cleaner case (intake chamber) 51 , and a cylindrical air cleaner element (hereinafter simply referred to as an element) 52 accommodated in the air cleaner case 51 . A connecting tube 53 extending from the air cleaner case 51 toward the carburetor 27 is mainly used.

The air cleaner case 51 is made of a synthetic resin, and includes a case main body 54 that forms a right side portion located on the left and right inner sides (vehicle width direction inner side), and a left side portion that is located on the left and right outer sides (vehicle width direction outer side). It is divided into a cover 55.

  Referring also to FIG. 5, the case main body 54 and the case cover 55 are divided along a dividing surface B that has a curved shape that is convex to the left and right as viewed from above. The case cover 55 is formed shallower in the vehicle width direction (left-right direction) than the case body 54. The case main body 54 and the case cover 55 are opened toward each other, and are detachably coupled by a plurality of screws S in a state where these opening ends are aligned with each other.

The case main body 54 includes a bottom wall 56 that constitutes a side wall portion on the inner side in the vehicle width direction, and a side wall 57 that rises outward from the outer periphery of the bottom wall 56 in the vehicle width direction.
The bottom wall 56 is a side wall portion 56a whose front and rear intermediate portion is substantially orthogonal to the left and right direction, and the front portion of the side wall portion 56a is a front inclined portion 56b that is inclined so as to be positioned on the outer side in the vehicle width direction toward the front side. The rear portion of the side wall portion 56a is a rear concave portion 56c that is displaced outward in the vehicle width direction so as to avoid the rear cushion 19.

  Referring to FIG. 6, the side wall 57 has a first side wall 57 a provided to be inclined rearwardly at the front upper side of the case body 54, and a substantially vertical side view from the rear edge of the first side wall 57 a. The second side wall 57b extending upward, the third side wall 57c extending upward (outside the case) from the upper edge of the second side wall 57b and extending rearward, and the rear edge of the third side wall 57c A fourth side wall 57d extending downward from the fourth side wall 57d, a fifth side wall 57e extending forward from the lower edge of the fourth side wall 57d, and a forward convex from the front edge of the fifth side wall 57e to the front edge of the first side wall 57a. It has a sixth side wall 57f that has a bulging shape and extends upward.

A circular air inlet 61 is formed in the second side wall 57b (see FIGS. 3 and 8), and the outside air sucked into the air cleaner case 51 from the air inlet 61 passes through the space on the upper rear side in the air cleaner case 51. After flowing diagonally downward and rearward along the third side wall 57c , folded back downward and forward in the space inside the rear part of the case, and flowed forward through the space inside the lower part of the case, the element 52 accommodated inside the front part of the case It is filtered by passing from the outer peripheral side to the inner peripheral side. Note that an arrow F in FIG. 6 indicates a flow path of outside air in the air cleaner case 51. A guide cylinder 61a made of a flexible material such as rubber is provided inside the case of the air inlet 61 (see FIG. 3).

Referring to FIG. 4, the element 52 is housed inside the front portion of the air cleaner case 51 in a state where the axis thereof is substantially horizontal and the front side is inclined so as to be located on the inner side in the vehicle width direction. A circular exhaust port 62 is formed in the front inclined portion 56b of the bottom wall 56 of the case body 54 (see FIGS. 6 and 8), and one end in the axial direction of the element 52 is located inside the case of the exhaust port 62 via the element holder 52a. Attached. The inner peripheral side of the element 52 communicates with the outside of the case through the exhaust port 62.

Referring to FIG. 4, a rear end portion (upstream end portion) of a connecting tube 53 made of a flexible material such as rubber is fitted and held in the exhaust port 62. The connecting tube 53 extends to the front inner side of the exhaust port 62 and then bends forward to extend to the rear end (upstream end) of the carburetor 27 located in front of the air cleaner case 51 and on the inner side in the vehicle width direction. Connected. The filtered outside air that has passed through the element 52 is supplied to the engine via the exhaust port 62, the connecting tube 53, and the like.

Referring to FIGS. 4 and 5, the case cover 55 is provided so as to be entirely curved along the dividing surface B in a top view, and includes a cover bottom wall 58 constituting a side wall portion on the outer side in the vehicle width direction. , And a cover side wall 59 that rises outward from the outer periphery of the cover bottom wall 58 in the vehicle width direction.
The cover bottom wall 58 is provided so as to be curved along the dividing surface B. Further, the cover side wall 59 is provided so as to overlap the side wall 57 in a side view so as to be aligned with the side wall 57 of the case body 54, and the first to sixth cover side walls corresponding to the side walls 57a to 57f. It has 59a-59f continuously.

On the front upper side of the case cover 55, above the first cover side wall 59a and in front of the second cover side wall 59b, a front part of the third cover side wall 59c and an upper part of the sixth cover side wall 59f are seen in side view. The intake upstream outer wall 63 has an outer edge shape that extends from each other.
On the other hand, on the front upper side of the case main body 54, above the first side wall 57a and in front of the second side wall 57b, the intake air facing the intake upstream outer wall 63 at the intermediate portion in the vehicle width direction of the case main body 54. An upstream inner wall 64 is provided (see FIG. 6). The front part of the third side wall 57c and the upper part of the sixth side wall 57f extend along the outer edge shape of the intake upstream inner wall 64 in the vehicle width direction inner side than the intake upstream inner wall 64 in a side view. Intersect.

  Thus, in a state where the case cover 55 is attached to the case main body 54, the side walls 57 a, 57 b, 59 a, 59 b and the inner and outer walls 63, 64 immediately before the intake port 61, on the upper front side of the air cleaner case 51 and on the outer side in the vehicle width direction. A space (pre-chamber chamber) T1 surrounded by is formed (see FIG. 3). The intake upstream outer wall 63 is formed such that an inner peripheral portion in a side view bulges outward in the vehicle width direction so as to increase the capacity of the pre-chamber chamber T1 (see FIG. 9). Above the pre-chamber chamber T1, a flange 65 having a U-shape formed in a side view, which is formed of an extension part of the third side wall 57c and a part of the extension part of the sixth side wall 57f, is provided (see FIG. 6).

  5 and 6, in the opening 54a on the left side of the case body 54, a mating portion 66 for attaching the case cover 55 in a sealed state (airtight state) to the leading edge (left side edge) of each of the side walls 57a to 57f. Are formed continuously over the entire circumference. The mating portion 66 extends along the periphery of the opening 54a, and has a U-shaped cross-sectional shape that opens to the left (case cover 55 side).

On the other hand, referring to FIGS. 5 and 7, in the opening 55a on the right side of the case cover 55, the cover side mating portion 67 corresponding to the mating portion 66 is entirely provided at the leading edge (right side edge) of each of the cover side walls 59a to 59f. It is formed continuously over the circumference. The cover side aligning portion 67 extends along the periphery of the opening 55a and has a U-shaped cross-sectional shape that opens to the right (the case main body 54 side).

  A sealing material is disposed inside each of the mating portions 66 and 67. For example, the cover side mating portion 67 is displaced to the outer peripheral side by the thickness of the front end flange and is fitted to the mating portion 66, so that the case body 54 and the openings 54a and 55a of the case cover 55 are connected to each other in a sealed state, so that the intake chamber T2 is formed in the air cleaner case 51 in an airtight state.

Air (outside air) introduced into the air cleaner case 51 (intake chamber chamber T2) from the intake port 61 obliquely passes along the third side wall 57c in the upper rear side space (upstream flow path R1) in the air cleaner case 51. Flows downward and rearward, flows in a space inside the case rear part (the bypass flow path R2) so as to hit the fourth and fifth side walls 57d and 57e and fold downward and forward, and the space inside the lower part of the case (downstream flow path R3) (See arrow F above). The outside air passes through the cylindrical element 52 from the outer periphery to the inner periphery on the inner side of the case and is filtered, and then supplied to the engine E through the exhaust port 62 and the connecting tube 53.

  Here, referring to FIGS. 3, 6, and 7, in the upper and lower intermediate portions of the air cleaner case 51, the flow of outside air from the intake port 61 to the exhaust port 62 follows the third to fifth side walls 57 c to 57 e. A detour guide wall 68 is provided. By this guide wall 68, an upstream flow path R1 that causes air to flow obliquely downward and rearward above, and a bypass flow path that bypasses the air flow so as to be folded forward from below in a space behind the rear end of the guide wall 68. R2 and a downstream flow path R3 that flows air forward under the guide wall 68 are partitioned.

  The guide wall 68 includes a main body side guide wall 68a that rises inward from the bottom wall 56 of the case main body 54, and a cover side guide wall 68b that rises inward from the bottom wall 58 of the case cover 55. The guide wall 68 is separated from the intersection of the first and second side walls 57a and 57b from the crossing portion between the second and fourth side walls 57b and 57d in a side view and is substantially spaced apart from the lower side of the third side wall 57c. It is provided to extend in parallel.

  As shown in FIGS. 3 and 5, the cover-side guide wall 68b is disposed so as to be displaced with a predetermined gap S1 obliquely downward and forward with respect to the main body-side guide wall 68a. Further, the standing tip ends of the guide walls 68a and 68b from the bottom walls 56 and 58 are provided so as to overlap each other by a predetermined amount S2 in the standing direction.

  As shown in FIGS. 3, 6, and 8, inside the case main body 54 (inner peripheral side of the side wall 57), inside the case at the intersection of the first and second side walls 57 a and 57 b, and at the rear part of the third side wall 57 c. A cylindrical first along the vehicle width direction is provided on the inside of the case, the inside of the case at the intersection of the fourth and fifth side walls 57d, 57e, the inside of the case at the middle of the fifth side wall 57e, and the inside of the case on the upper and lower sides of the sixth side wall 57f. To sixth bosses 71a to 71f. Each of the bosses 71a to 71f is for fastening the case cover 55, and a tapping hole for fastening the screw S is formed in the central portion thereof.

On the other hand, as shown in FIGS. 3, 7, and 9, the inside of the case cover 55 (inner peripheral side of the cover side wall 59), the inside of the case at the intersection of the first and second cover side walls 59 a and 59 b, the third There is a vehicle width inside the case inside the rear portion of the cover side wall 59c, inside the case at the intersection of the fourth and fifth cover side walls 59d, 59e, inside the case at the middle portion of the fifth cover side wall 59e, and inside the case above and below the sixth cover side wall 59f. Cylindrical first to sixth cover-side bosses 72a to 72f are provided along the direction, respectively. Each of the cover-side bosses 72a to 72f is for fastening to the case main body 54, and an insertion hole for inserting the screw S is formed in the central portion thereof.

  The cover-side bosses 72a to 72f are provided so as to overlap the bosses 71a to 71f of the case main body 54 in a side view. The tips of the bosses 71a to 71f and the cover-side bosses 72a to 72f are in contact with each other, and in this state, the corresponding parts are fastened to each other.

  Referring to FIG. 6, the second and third bosses 71b and 71c are positioned on the outer peripheral side of the folded flow path, and gradually approach the side wall 57 from the bosses 71b and 71c. As described above, ribs 73 are provided to extend to the upstream side and the downstream side of the flow path F so as to connect the front ends thereof to the side walls 57. The base ends of the ribs 73 on the bosses 71b and 71c side are connected to the side surface of the corresponding boss opposite to the adjacent side wall. Each rib 73 is provided so as to be curved in a concave shape when viewed from the inside of the case so as to approach the side wall 57 from the side surface of the corresponding boss.

Referring also to FIG. 7, the second and third cover-side bosses 72b and 72c are also located on the outer peripheral side of the bypass flow path R2, and the cover-side bosses 72b and 72c include Cover side ribs 74 extending from the side bosses 72b and 72c to the cover side wall 59 so as to gradually approach the cover side wall 59 and extending to the upstream side and the downstream side of the flow path F and connecting the tip ends to the cover side wall 59 are provided. The base end portion of each cover side rib 74 on the cover side boss 72b, 72c side is connected to the side surface of the corresponding boss opposite to the adjacent side wall. Each of the cover-side ribs 74 is provided so as to be curved in a concave shape when viewed from the inside of the case so as to approach the cover side wall 59 from the side surface of the corresponding boss.

  The ribs 73 and the cover-side ribs 74 are provided so as to overlap each other in a side view. However, as shown in FIG. 5, the ribs 73 and the cover-side ribs in a state where the case cover 55 is attached to the case main body 54. A predetermined gap S <b> 3 is formed between the standing tip ends from the bottom walls 56 and 58 of 74. Spaces T ′ formed between the ribs 73 and 74 and the side walls 57 and 59 communicate with the intake chamber T2 in the air cleaner case 51 through the gap S3.

  Referring to FIGS. 6 and 7, the end portions of the ribs 73 and 74 on the side walls 57 and 59 are bent outward from the case, and the end portions are connected substantially perpendicular to the side walls 57 and 59. This is because the ribs 73 and 74 are connected to the corresponding side walls 57 and 59 at an acute angle and obliquely connected, so that the thickened range of the connecting portion is narrowed to suppress the occurrence of sink marks. Because. In addition, the said part is provided for the sake of shaping | molding, and if it sees the whole ribs 73 and 74, it can be said that these ribs 73 and 74 are inclined and formed so that the corresponding side walls 57 and 59 may approach gradually.

  As described above, in the air cleaner box structure in the above embodiment, the air cleaner case 51 having the intake port 61 and the exhaust port 62 has the case body 54 that opens one side and the case 54 that closes the opening 54a of the case body 54. The case main body 54 includes a bottom wall 56 located on the opposite side of the opening 54a, and a side wall 57 rising from the outer periphery of the bottom wall 56 toward the opening 54a. The tip edge is provided with a mating portion 66 with the case cover 55, and in the vicinity of the mating portion 66, bosses 71a to 71f for fastening the case cover 55 are provided. Is disposed on the inner side of the case with respect to the side wall 57, and on the inner side of the case of the side wall 57 from the bosses 71b and 71c. In which the ribs 73 that connects the front end side in the side wall 57 extends so as gradually approach the wall 57 is provided.

  According to this configuration, the side wall 57 and thus the outer peripheral side of the air cleaner case 51 can be formed smoothly, and the appearance of the air cleaner case 51 can be improved. And by providing the rib 73 which gradually approaches along the side wall 57 from the boss | hub 71b, 71c inside the side wall 57, the air which flows along the side wall 57 in the air cleaner case 51 can flow smoothly around the boss | hub 71b, 71c. The air flow in the air cleaner case 51 can be made smooth. Further, the bosses 71b and 71c are reinforced by the ribs 73, and the strength and size of the bosses 71b and 71c can be minimized.

  In the air cleaner box structure, the end of the rib 73 on the boss 71b, 71c side is connected to the side surface of the boss 71b, 71c opposite to the side wall 57, so that the air cleaner The air flowing along the side wall 57 in the case 51 can easily get over the bosses 71b and 71c, and the air flow in the air cleaner case 51 can be made smoother.

  Further, in the air cleaner box structure, the case cover 55 includes a cover bottom wall 58 that faces the opening 54a, and a cover side wall 59 that rises from the outer periphery of the cover bottom wall 58 toward the opening 54a. By providing cover side bosses 72a to 72f and cover side ribs 74 facing the bosses 71a to 71f and the ribs 73 on the case inner side of the cover side wall 59, the air flow in the air cleaner case 51 is further smoothed. be able to.

  Furthermore, in the air cleaner box structure, the rib 73 and the cover-side rib 74 are arranged so as to leave a gap S3 between the end portions thereof, so that the rib 73, 74 and the side walls 57, 59 are spaced apart from each other. The space T ′ formed in the above can be used as a resonator, and intake noise can be reduced.

  In the air cleaner box structure, a guide wall 68 is provided in the air cleaner case 51 to bypass the air flow path from the intake port 61 to the exhaust port 62 along the side walls 57 and 59. The bosses 71b, 71c, 72b, 72c having the ribs 73, 74 are arranged on the outer peripheral side of the bypass flow path R2, so that the dust in the air is removed by the bypass of the air flowing in the air cleaner case 51. It becomes easy to fall in the case 51. Also, by arranging the bosses 71b, 71c, 72b, 72c having the ribs 73, 74 on the outer peripheral side where the air in the bypass flow path R2 flows more densely, the air flow in the air cleaner case 51 is smoothed. Increases effectiveness.

The present invention is not limited to the above embodiment, and for example, a configuration in which at least one of the intake port 61 and the exhaust port 62 is provided in the case cover 55 may be employed. Alternatively, the case main body 54 may be disposed on the outer side in the vehicle width direction, and the case cover 55 may be disposed on the inner side in the vehicle width direction. Further, in the case where the element 52 is not a cylindrical shape but is a thick panel type that is sandwiched between the case main body 54 and the case cover 55, the guide wall 68 may be extended from the panel type element. Good.
And the structure in the said Example is an example of this invention, and it can be applied to various vehicles not only a scooter type motorcycle, but various changes are possible in the range which does not deviate from the summary of the said invention. Not too long.

51 Air cleaner case (intake chamber)
54 Case body (chamber body)
55 Case cover (cover)
56 Bottom wall 57 Side wall 58 Cover bottom wall 59 Cover side wall 61 Inlet (inlet)
62 Exhaust port (exhaust port)
66 Matching section 68 Guide wall (wall board)
71a to 71f Boss 72a to 72f Cover side boss 73 Rib 74 Cover side rib S3 Gap R2 Detour channel

Claims (5)

An intake chamber having an inlet and an outlet includes a chamber body that opens one side, and a cover that closes the opening of the chamber body,
The chamber body has a bottom wall located on the opposite side of the opening, and a side wall rising from the outer periphery of the bottom wall to the opening side,
In the air cleaner box structure in which a boss for fastening the cover is provided in the vicinity of the mating portion in the vicinity of the mating portion, the tip edge of the side wall is provided with the mating portion.
The boss is disposed on the inner side of the case with respect to the side wall, and a rib is provided on the inner side of the side wall of the side wall so as to extend gradually from the boss to the side wall and connect the tip side to the side wall. Air cleaner box structure.   2. The air cleaner box structure according to claim 1, wherein an end portion of the rib on the boss side is connected to a side surface opposite to the side wall among the side surfaces of the boss. The cover has a cover bottom wall facing the opening, and a cover side wall rising from the outer periphery of the cover bottom wall to the opening side,
The air cleaner box structure according to claim 1 or 2, wherein a cover-side boss and a cover-side rib facing the boss and the rib are provided inside the case on the cover side wall.   The air cleaner box structure according to claim 3, wherein the rib and the cover-side rib are arranged so as to leave a gap between end portions thereof. A wall plate is provided in the intake chamber for bypassing the air flow path from the suction port to the discharge port along the side wall, and the boss having the rib is provided on the outer peripheral side of the bypass flow channel. It arrange | positions, The air cleaner box structure of any one of Claim 1 to 4 characterized by the above-mentioned.

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