JP2010190065A5 - - Google Patents

Description

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.

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.

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.

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).

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.

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.

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 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.

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