JP5987582B2 - Suction type vehicle intake structure - Google Patents

Description

  The present invention relates to an intake structure for a saddle riding type vehicle in which an air cleaner box is suitably formed.

  A conventional motorcycle is provided with an air cleaner box that is disposed below an occupant seat and that sucks outside air (air), filters it, and supplies combustion air to the engine. Since this air cleaner box has a wide flat wall and is formed of a resin having low rigidity, it tends to propagate the vibration of the vehicle during traveling and tends to generate noise.

  As a countermeasure against this, as described in Patent Document 1, rib-like protrusions are provided on the inner surface of the plane wall of the air cleaner box in a cross-beam shape to increase the rigidity of the plane wall and improve the vibration damping performance of the air cleaner box. The structure is known.

JP-A-9-29026

  However, as described in Patent Document 1, when rib-like protrusions are formed in a cross-beam shape on the inner surface of the plane wall of the air cleaner box, the protrusions increase the weight of the air cleaner box.

  An object of the present invention is to provide an intake structure for a straddle-type vehicle that can improve the vibration damping performance of an air cleaner box while suppressing an increase in weight.

In the present invention, front and rear wheels are respectively supported by a vehicle body frame at the front and rear of the vehicle, an engine is disposed at the front portion of the vehicle body frame, and a seat for seating is disposed at the center in the front-rear direction of the vehicle body frame, In the intake structure of a saddle-ride type vehicle provided with an air cleaner box that sucks outside air and supplies combustion air to the engine, the air cleaner box has an uneven portion on a wall, and an inner surface of the wall corresponding to the uneven portion A valley portion is formed in the air cleaner box, and the valley portion is formed to extend from the vicinity of an outlet that allows the outside air to flow into the air cleaner box, and the air cleaner box has a rib-like protrusion on the inner surface of the wall. The protrusions are provided so as to intersect at right angles to the extending direction of the peaks and valleys, and the peaks on the inner surface of the wall of the air cleaner box. Department of peaks and valleys and among the partitioned compartment area between the protrusions, and is characterized in that the area of the divided areas adjacent is configured differently.

  According to the present invention, since the uneven portion is formed on the wall of the air cleaner box, the rigidity of the wall is increased. As a result, the vibration of the vehicle when the vehicle travels, the intake of outside air, or the supply of combustion air The accompanying vibration of the air cleaner box wall can be suppressed and noise can be reduced.

  In addition, since the valley portion is formed on the inner surface of the wall of the air cleaner box, it is not necessary to form reinforcing ribs, for example, in the form of a cross-beam, on the inner surface of the wall by using this mountain valley portion. As a result, the number of reinforcing ribs can be reduced, and an increase in the weight of the air cleaner box can be suppressed.

1 is a right side view showing a motorcycle to which an embodiment of an intake structure for a saddle riding type vehicle according to the present invention is applied. The partial side view which removes and shows a side cover, a front wheel, etc. in the motorcycle of FIG. The fragmentary sectional view which follows the III-III line of FIG. The perspective view which shows the air cleaner box of FIG. The front view of the air cleaner box of FIG. FIG. The VII arrow line view of FIG. The inner side view which shows the air cleaner cap in the air cleaner box of FIG. 5 from an inner side. The perspective view which shows the air cleaner cap in the air cleaner box of FIG. Sectional drawing which follows the XX line of FIG. Sectional drawing which follows the XI-XI line of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a right side view showing a motorcycle to which an embodiment of an intake structure for a saddle-ride type vehicle according to the present invention is applied. FIG. 2 is a partial side view showing the motorcycle shown in FIG. 1 with a side cover and front wheels removed.

  The motorcycle 10 as a saddle-ride type vehicle shown in FIG. 1 and FIG. 2 has a vehicle body frame 11 having a head pipe 12 at the front end. The vehicle body frame 11 includes the head pipe 12, the first main frame 13A, the second main frame 13B, the down tube 14, and a pair of left and right rear frames 15.

  A steering bracket 16 is pivotally supported on the head pipe 12 positioned above the front portion of the vehicle body frame 11. A front suspension 17 and a handle bar 18 that rotatably support the front wheel 19 are attached to the steering bracket 16. Thereby, the front wheel 19 is disposed on the front portion of the vehicle supported by the head pipe 12. Then, by operating the handle bar 18 left and right, the front wheel 19 is steered left and right via the steering bracket 16 and the front suspension 17. A front fender 20 is fixed to the front suspension 17 so as to cover the upper part of the front wheel 19.

  As shown in FIG. 2, the first main frame 13A extends obliquely downward from the upper rear surface of the head pipe 12, and a pair of left and right second main frames 13B are coupled to the rear end of the first main frame 13A. Is done. These second main frames 13B bend and extend downward in the vehicle, and a pivot plate 21 is coupled to the lower end portion. The down tube 14 extends downward from the lower rear surface of the head pipe 12 and is coupled to an engine case 31 (both described later) of the engine 30.

  A pivot shaft 22 is installed on the pivot plate 21, and a swing arm 23 is pivotally supported on the pivot shaft 22 so as to be swingable in the vehicle vertical direction. A rear wheel 24 is rotatably supported at the rear end of the swing arm 23. As a result, the rear wheel 24 is disposed at the rear of the vehicle, supported by the pivot plate 21.

  A pair of left and right rear frames 15 are coupled to the upper part of the second main frame 13B and extend rearward of the vehicle. The rear frame 15 is supported on the lower end portion of the second main frame 13B via the subframe 25. Further, the fuel tank 26 is supported at the rear position of the head pipe 12 by the first main frame 13A. Further, the rear frame 15 supports a seat 27 on which an occupant is seated adjacent to the rear of the fuel tank 26 and rearward from the center in the front-rear direction of the vehicle. Further, a rear fender 28 (FIG. 1) covering the upper portion of the rear wheel 24 is suspended and supported by the rear frame 15.

  As shown in FIGS. 1 and 2, the engine 29 is disposed below the fuel tank 26 in the front portion of the vehicle body frame 11, that is, between the first main frame 13 </ b> A, the second main frame 13 </ b> B, and the down tube 14. . The engine 29 is mounted on the vehicle with the engine case 30 suspended from both lower ends of the second main frame 13B and the down tube 14, and the driving force drives the rear wheel 24.

  A fuel mixing device (for example, a carburetor) 32 and an air cleaner box 33 constituting an engine intake system are sequentially connected to a rear portion of the cylinder head 31 constituting the engine 29. The air cleaner box 33 is installed below the boundary position between the fuel tank 26 and the seat 27. Further, an exhaust pipe 34 (FIG. 1) that is an engine exhaust system is connected to the front portion of the cylinder head 31. The exhaust pipe 34 extends rearward of the vehicle, and an exhaust muffler 35 is connected to the rear end.

  The above-described body frame 11 and the like are covered with body frames such as a front cover 36, a side cover 37, and a rear cover 38. That is, a front cover 36 that covers the front upper part of the vehicle is installed on the steering bracket 16 or the front suspension 17, and a headlight 39 and the like are disposed on the front cover 36. In addition, a pair of left and right side covers 37 are attached to the second main frame 13 </ b> B and the rear frame 15 to cover the area below the front portion of the seat 27 behind the engine 29. In this region, as shown in FIGS. 2 and 3, the air cleaner box 33, the battery 40, and the like are disposed, so that the air cleaner box 33 and the battery 40 are covered with the side cover 37. Further, a pair of left and right rear covers 38 are attached to the rear frame 15 so as to cover an area below the rear portion of the seat 27 on the rear wheel 24.

  The air cleaner box 33 sucks outside air (air) and supplies combustion air to the engine 29. As shown in FIGS. 4 to 7, a box-shaped box body having an opening (not shown). 41, an air cleaner cap 42 that closes the opening of the box body 41, and an air filter 43 that is disposed at a joint position between the box body 41 and the air cleaner cap 42 and filters air.

  The inside of the air cleaner box 33 is partitioned by the air filter 43 into a dirty side 44 on the air cleaner cap 42 side and a clean side 45 on the box body 41 side.

  The air cleaner cap 42 is provided with an inlet tube 46 communicating with the dirty side 44, and outside air (air) is sucked from the inlet 46 </ b> A of the inlet tube 46, and the outside air flows into the dirty side 44. The end on the dirty side 44 side of the inlet tube 46 that flows outside air into the dirty side 44 is an outflow port 46B shown in FIGS.

  As shown in FIGS. 5 and 6, the box body 41 is provided with a discharge duct 47 communicating with the clean side 45, and this discharge duct 47 is connected to the fuel mixing device 32 (FIG. 2). In the air cleaner box 33 (for example, FIG. 6), the dust in the dirty side 44 is removed by the air filter 43 to reach the clean side 45, becomes combustion air, passes through the discharge duct 47, and the fuel mixing device 32. To be sent to. The combustion air is mixed with fuel by the fuel mixing device 32 to become a combustion mixture, and is supplied to a combustion chamber (not shown) in the cylinder head 31 of the engine 29 through the intake manifold 48 (FIG. 2).

  Here, as shown in FIGS. 3, 4, 6, and 7, a battery holding portion 49 is integrally formed on the box body 41 of the air cleaner box 33 on the side opposite to the opening. The battery 40 is placed on the battery holding portion 49, and the battery 40 is held in the battery holding portion 49 adjacent to the air cleaner box 33 by a strip-shaped battery holder (not shown).

  Further, as shown in FIGS. 3, 4, 5, etc., a tool box 50 capable of storing an in-vehicle tool (not shown) is integrally formed at the bottom of the box body 41. In addition, a drain tube 51 is connected to the bottom of the box body 41 adjacent to the tool box. The drain tube 51 communicates with a drain hole 52 (FIG. 9) of the air cleaner cap 42 and discards water, dust, and the like inside the air cleaner box 33 to the outside through the drain hole 52.

  Incidentally, the air cleaner cap 42 of the air cleaner box 33 shown in FIGS. 4 and 5 is detachably attached to the box body 41. The front wall 53 of the air cleaner cap 42 has a convex portion 54 and a concave portion on the outer side surface thereof. Concave and convex portions 56 that are alternately adjacent to 55 are formed. As shown in FIGS. 8 and 9, a mountain valley portion 59 in which the mountain portions 57 and the valley portions 58 are alternately adjacent to each other is provided on the inner surface of the front wall 53 corresponding to the uneven portion 56. The peak portion 57 of the valley portion 59 corresponds to the concave portion 55 of the uneven portion 56, and the valley portion 58 of the peak portion 59 corresponds to the convex portion 54 of the uneven portion 56.

  As shown in FIG. 3, the uneven portion 56 of the air cleaner cap 42 is provided substantially in parallel along the shape of the side cover 37 that covers the front wall 53 of the air cleaner cap 42. Accordingly, the convex portion 54 of the concave and convex portion 56 of the air cleaner cap 42 bulges outward along the outwardly bulging portion 37A of the side cover 37, and the capacity of the air cleaner box 33 is increased accordingly.

  As shown in FIGS. 8 and 9, a mountain valley 59 on the inner side surface of the front wall 53 of the air cleaner cap 42 is near the outlet 46 </ b> B of the inlet tube 46 that allows the outside air to flow out into the air cleaner box 33 (inside the dirty side 44). It is formed extending from the straight line. For example, the interval between the adjacent valley portions 58 of the mountain valley portions 59 is gradually enlarged as the distance from the outlet 46B of the inlet tube 46 increases. For example, as shown in FIGS. 8, 10, and 11, at a position farther from the outlet 46 </ b> B of the inlet tube 46 than the interval L <b> 1 between the adjacent valley portions 58 at a position near the outlet 46 </ b> B of the inlet tube 46. The interval L2 between the adjacent valley portions 58 is set larger (L2> L1).

  A rib-shaped protrusion (that is, a reinforcing rib) 60 is provided on the inner surface of the front wall 53 of the air cleaner cap 42. A plurality of protrusions 60 are formed in parallel with each other so as to intersect substantially perpendicular to the extending direction of the peaks and valleys 59 on the inner side surface of the front wall 53. The projecting portion 60, together with the mountain and valley portions 59, mainly functions to increase the rigidity of the front wall 53 of the air cleaner cap 42. Since both the projecting portion 60 and the mountain valley portion 59 are formed inside the front wall 53 of the air cleaner cap 42, they are provided facing the dirty side 44.

  Further, on the inner side surface of the front wall 53 of the air cleaner cap 42, a plurality of partition regions 61 </ b> A, 61 </ b> B, 61 </ b> C, 61 </ b> D. As described above, the interval between the adjacent valley portions 58 of the mountain valley portions 59 is gradually enlarged as the distance from the outlet 46B of the inlet tube 46 increases. Are configured to be different from each other. Thereby, in the front wall 53 of the air cleaner cap 42, the resonance frequencies of the partition regions 61A, 61B, 61C, 61D.

Since it was configured as described above, according to the present embodiment, the following effects (1) to (7) are obtained.
(1) As shown in FIGS. 4 and 5, since the uneven portion 56 is formed on the front wall 53 of the air cleaner cap 42 of the air cleaner box 33, the rigidity of the front wall 53 of the air cleaner cap 42 is increased. As a result, the vibration of the air cleaner cap 42 of the air cleaner box 33 caused by the vibration of the vehicle while the vehicle is traveling, or the vibration of the air cleaner cap 42 of the air cleaner box 33 caused by the intake of the outside air to the air cleaner box 33 and the supply of combustion air. Both can be suppressed and noise can be reduced.

  (2) As shown in FIG. 8 and FIG. 9, the mountain valley portion 59 is formed on the inner surface of the front wall 53 of the air cleaner cap 42 of the air cleaner box 33 so as to correspond to the uneven portion 56. By using this, it is not necessary to form reinforcing ribs, for example, in the form of a cross-beam, on the inner surface of the front wall 53 of the air cleaner cap 42, and the projecting portion 60 as the reinforcing rib intersects the extending direction of the mountain and valley portions 59 at a substantially right angle. It would be enough if it was formed to As a result, the number of protrusions 60 as reinforcing ribs for increasing the rigidity of the air cleaner cap 42 can be reduced, and an increase in the weight of the air cleaner box 33 can be suppressed.

  (3) As shown in FIG. 3, the uneven portion 56 formed on the front wall 53 of the air cleaner cap 42 of the air cleaner box 33 is provided substantially in parallel along the shape of the side cover 37 that covers the air cleaner box 33. Yes. For this reason, the convex part 54 of the uneven | corrugated | grooved part 56 in the front wall 53 of the air cleaner cap 42 bulges outward along the outwardly bulging portion 37A of the side cover 37. As described above, the capacity of the dirty side 44 of the air cleaner box 33 can be increased by effectively utilizing the inner space of the side cover 37, particularly the bulging portion 37A.

  (4) As shown in FIG. 8 and FIG. 9, the mountain valley portion 59 formed on the inner side surface of the front wall 53 in the air cleaner cap 42 of the air cleaner box 33 has an interval between the adjacent valley portions 58 of the inlet tube 46. It is formed to expand gradually as it gets away from the outlet 46B. For this reason, the outside air (air) flowing out from the outlet 46 </ b> B of the inlet tube 46 into the dirty side 44 diffuses throughout the dirty side 44 and passes through a wide range of the air filter 43. As a result, the area of the air filter 43 can be used effectively and local clogging of the air filter 43 can be prevented.

  (5) A rib-like protrusion for increasing the rigidity of the air cleaner cap 42 on the inner side surface of the front wall 53 of the air cleaner cap 42 of the air cleaner box 33 so as to intersect the extending direction of the mountain and valley portions 59 substantially at right angles. 60 is formed as a reinforcing rib. Also, the outside air (air) flowing out into the dirty side 44 of the air cleaner box 33 also spreads in the longitudinal direction of the protrusion 60, and diffuses and flows throughout the dirty side 44 by the protrusion 60. Also from this point, the area of the air filter 43 can be used effectively, and local clogging of the air filter 43 can be prevented.

  (6) Further, the protrusion 60 is formed so as to intersect the extending direction of the peak / valley portion 59 on the inner surface of the front wall 53 of the air cleaner cap 42 at a substantially right angle, and is not formed in a cross beam shape. For this reason, dust (for example, sand dust) in the outside air that has flowed into the dirty side 44 of the air cleaner box 33 does not remain on the inner side surface of the air cleaner cap 42, falls downward, passes through the drain tube 51 through the drain hole 52. Easily discarded. Also from this point, clogging of the air filter 43 can be suppressed.

  (7) The inner surface of the air cleaner cap 42 of the air cleaner box 33 is partitioned by a peak 57, a valley 58, and a protrusion 60 of a peak / valley 59, and a plurality of partition areas 61A, 61B, 61C, 61D,. The areas of these adjacent partition regions 61A, 61B, 61C, 61D... Are different. As a result, the resonance frequency of each partition region 61A, 61B, 61C, 61D... Is dispersed with respect to the vibration of the air cleaner box 33, particularly the air cleaner cap 42, so that the vibration of the air cleaner box 33 can be satisfactorily suppressed as a whole.

  Although the embodiment has been described above, the present invention is not limited to the specific configuration of the embodiment as described above, and various modifications can be made without departing from the gist of the present invention. For example, in the air cleaner box 33, the air filter 43 may be installed inside the box body 41, the inlet tube 46 may be provided in the box body 41, and the discharge duct 47 may be provided in the air cleaner cap 42.

10 Motorcycle (saddle-ride type vehicle)
11 Body frame 19 Front wheel 24 Rear wheel 27 Seat 29 Engine 33 Air cleaner box 37 Side cover (body cover)
37A bulging portion 41 box main body 42 air cleaner cap 46 inlet tube 46B outlet 53 front wall 56 uneven portion 57 mountain portion 58 valley portion 59 valley portion 60 protrusions 61A, 61B, 61C, 61D ... partition regions L1, L2 spacing

Claims (6)

A front wheel and a rear wheel are respectively supported by a body frame at the front and rear of the vehicle, an engine is disposed at a front portion of the body frame, and a seating seat is disposed at a center portion in the front-rear direction of the body frame to suck in outside air. In the intake structure of a saddle-ride type vehicle equipped with an air cleaner box for supplying combustion air to the engine,
The air cleaner box includes a concavo-convex portion on a wall, and a ridge / valley portion is formed on the inner surface of the wall corresponding to the concavo-convex portion, and the ridge / valley portion extends from the vicinity of an outlet that allows the outside air to flow into the air cleaner box. Formed,
In addition, the air cleaner box includes a rib-like protrusion on the inner surface of the wall, and the protrusion is provided so as to intersect substantially at right angles to the extending direction of the mountain and valley.
Further, among the partitioned regions partitioned by the crests and troughs of the ridges and valleys on the inner surface of the wall of the air cleaner box, the areas of the adjacent partitioned regions are different from each other. The intake structure of a saddle-ride type vehicle. 2. The intake structure for a saddle-ride type vehicle according to claim 1 , wherein an interval between adjacent valley portions of the mountain valley portion is provided so as to gradually increase as the distance from the outflow port increases. The straddle type according to claim 1 or 2 , wherein the air cleaner box is disposed so as to be covered with a vehicle body cover, and an uneven portion of a wall of the air cleaner box is provided along a shape of the vehicle body cover. Vehicle intake structure. The air cleaner box has a box-shaped box body with an opening and an air cleaner cap that closes the opening of the box body, and the front wall of the air cleaner cap is provided with an uneven portion. The intake structure for a saddle-ride type vehicle according to any one of claims 1 to 3 . A front wheel and a rear wheel are respectively supported by a body frame at the front and rear of the vehicle, an engine is disposed at a front portion of the body frame, and a seating seat is disposed at a center portion in the front-rear direction of the body frame to suck in outside air. In the intake structure of a saddle-ride type vehicle equipped with an air cleaner box for supplying combustion air to the engine,
The air cleaner box includes a concavo-convex portion on a wall, and a ridge / valley portion is formed on the inner surface of the wall corresponding to the concavo-convex portion, and the ridge / valley portion extends from the vicinity of an outlet that allows the outside air to flow into the air cleaner box. Formed,
The air cleaner box is disposed so as to be covered with a vehicle body cover, and the uneven portion of the wall of the air cleaner box is provided along the shape of the vehicle body cover. . A front wheel and a rear wheel are respectively supported by a body frame at the front and rear of the vehicle, an engine is disposed at a front portion of the body frame, and a seating seat is disposed at a center portion in the front-rear direction of the body frame to suck in outside air. In the intake structure of a saddle-ride type vehicle equipped with an air cleaner box for supplying combustion air to the engine,
The air cleaner box includes a concavo-convex portion on a wall, and a ridge / valley portion is formed on the inner surface of the wall corresponding to the concavo-convex portion, and the ridge / valley portion extends from the vicinity of an outlet that allows the outside air to flow into the air cleaner box. Formed,
An intake structure for a saddle-ride type vehicle , wherein an interval between adjacent valley portions of the mountain-valley portions is gradually increased as the distance from the outlet port increases .

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