JP4985702B2 - Air cleaner - Google Patents

Description

  The present invention relates to an air cleaner, and more particularly, to an air cleaner for a vehicle in which a recess that bulges inside is formed.

  The air cleaner of a vehicle, for example a motorcycle, is arranged so that clean air stays in the vicinity of the engine so that clean air can be immediately supplied to the engine even if the engine output changes suddenly. Ideal to do. However, in an actual scooter type motorcycle, a footrest space is secured in front of the engine, and a seating seat is disposed above it, and in some cases, a helmet storage space is often installed above the engine. The air cleaner is disposed behind the engine, and the space in which the air cleaner can be disposed is limited. Further, when the vehicle is turned with the vehicle body tilted as in a two-wheeled vehicle, if the air cleaner is expanded in the width direction of the vehicle, the weight balance of the vehicle is lost, which is not preferable.

  Therefore, as a conventional air cleaner arrangement position and internal structure, in a scooter type motorcycle having a power unit in which an engine and a power transmission device are integrally provided, the air cleaner is relatively strong in order to avoid dust and stepping stones. Located at the top of the power unit. Also, an internal structure of an air cleaner is known in which two case members on the left and right are joined in the vehicle width direction, and a filter is disposed on the joining surface.

  As described above, even when the air cleaner is arranged at the upper part of the power unit, the rear wheel in the vicinity thereof winds up sand and dust on the road surface, and this sand and dust may enter the air cleaner. In order to avoid this, it is necessary to provide the inlet of the air cleaner as far as possible in the front of the vehicle. Further, a rear cushion unit is stretched up and down on the rear part of the vehicle body frame and the power unit, and the rear cushion unit is present in the vicinity of the air cleaner. For this reason, the recessed part for detouring a rear cushion unit needs to be formed in the side surface of an air cleaner.

  In the air cleaner described in Patent Document 1 as a conventional technique, a filter is installed on a joint surface between an inner case where a recess is formed and an outer case attached to the inner case, and the inside of the inner case serves as a filter. An air cleaner is disclosed in which a dirty side chamber for guiding the air before being purified and a clean side chamber for guiding the air purified by a filter in the outer case are defined. Furthermore, in this air cleaner, air is introduced from the suction port provided in front of the air cleaner to the rear of the recess in the dirty side chamber through the introduction pipe.

JP-A-11-198885

  However, in the air cleaner described in Patent Document 1, since a constricted space whose diameter is reduced between the concave portion of the inner case and the filter is formed in the dirty side chamber, the pressure generated by the air released behind the constricted space A part of the pressure wave before passing through the filter of the wave propagates to the front of the air cleaner and contracts in the constricted space and expands after passing therethrough, which may cause the generation of intake sound. Furthermore, since the dirty side chamber extends to the front of the constricted space, the shape of the clean side chamber becomes elongated, which also contributes to the generation of intake noise.

  In addition, since the dirty side chamber extends to the front of this constricted space including the constricted space, the capacity of the clean side chamber is reduced, and sufficient clean air to be supplied to the engine cannot be secured, resulting in a decrease in engine output. There is.

  An object of the present invention is to provide an air cleaner that can reduce the intake noise generated in the air cleaner and sufficiently ensure a clean air capacity.

In the present invention, a rear wheel is attached to a rear portion of a power unit in which an engine and a power transmission device are integrated, and the power unit is pivotally supported with respect to a vehicle body frame, above the power unit and above the vehicle body frame. In the air cleaner, which is arranged below the rear part, the case body and the outer cover are joined, and a filter is sandwiched between these joined surfaces, and the case body is formed with a recessed part that bulges inside. A rear space adjacent to the concave portion in the inner space of the case body provided is provided as a dirty side chamber, and the clean side chamber is disposed inside the case body and the outer cover with the filter separated from the dirty side chamber. provided space and the recess, the rear and the power of the vehicle frame In the dirty side chamber, an intake passage extending from the suction port provided in front of the recessed portion is formed at the intersection with the rear cushion unit that is stretched up and down around the knit so as to avoid this rear cushion unit. In the dirty side chamber, a resonator into which a part of the air in the intake passage is introduced is vertically arranged along the rear peripheral wall in the dirty side chamber. It is arrange | positioned in the space enclosed by the said intake channel | path which curves .

According to the present invention, since the one side space adjacent to the recess in the internal space of the case body is provided as a dirty side chamber, the pressure wave of the air introduced into the dirty side chamber causes the constricted space corresponding to the recess to Intake noise can be reduced because it does not change rapidly after passing. In addition, the internal space on the opposite side of the dirty side chamber across the recess in the case body also becomes part of the clean side chamber along with the constricted space corresponding to the recess, so the shape of this clean side chamber is not elongated and has an appropriate volume shape From this point, the intake noise can be reduced, and the capacity of the clean side chamber is increased, so that a sufficient clean air capacity can be secured.

1 is a left side view showing a scooter type motorcycle to which a first embodiment of an air cleaner according to the present invention is applied. The left view which shows the air cleaner of FIG. The disassembled perspective view of the air cleaner of FIG. The left view which shows the case body of FIG. The top view which shows the case body of FIG. Sectional drawing which follows the VI-VI line of FIG. The left view which shows 2nd Embodiment in the air cleaner which concerns on this invention. The disassembled perspective view which shows the air cleaner of FIG. The left view which shows the case body of FIG. Sectional drawing which follows the XX line of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[A] First embodiment (FIGS. 1 to 6)
FIG. 1 is a left side view showing a scooter type motorcycle to which a first embodiment of an air cleaner according to the present invention is applied.

  The scooter-type motorcycle 1 includes an underbone-type body frame 2. A front fork 3 is supported on a front head of the body frame 2 together with a handlebar 4 so as to be rotatable left and right. A front wheel 5 is pivotally supported at the tip. On the other hand, a power unit 8 is pivotally supported at the lower center of the vehicle body frame 2 via a swing bracket 6 so as to be swingable in the vertical direction around the pivot shaft 7.

  The power unit 8 is generally used for a scooter. The engine 10 and a power transmission device 11 are integrally formed, and a rear wheel 12 is directly supported on the rear portion of the power transmission device 11. A rear cushion unit 13 is stretched up and down between the rear portion of the power transmission device 11 and the rear portion (seat rail 9) of the vehicle body frame 2, and the power unit 8 and the rear wheel 12 are buffered and suspended by the rear cushion unit 13.

  A seating seat 14 is placed on the body frame 2 above the seat rail 9 so as to be openable and closable, and an article storage chamber (not shown) capable of storing a helmet or the like is provided below the seating seat 14. For this reason, by opening the seating sheet 14, articles can be taken into and out of the article storage chamber. The vehicle body frame 2 is entirely covered with a synthetic resin frame cover 15 to improve the appearance and protect internal devices.

  A throttle body (not shown) is provided in the upper part of the engine 10, and an air cleaner 16 for purifying air supplied to the throttle body is provided above the power transmission device 11 of the power unit 8 and below the seat rail 9. Placed in. The air cleaner 16 is fixed to the power transmission device 11 with a bolt (not shown) or the like, and is provided so as to be swingable in the vertical direction together with the power unit 8.

  As shown in FIGS. 2 and 3, the air cleaner 16 has a case body 17 provided on the inner side of the vehicle and an outer cover 18 provided to be exposed on the left side of the vehicle joined, and a filter 19 is provided on the joint surface. The inner cover 20 is sandwiched. The case body 17 or the outer cover 18 (in this embodiment, the case body 17) is formed with a recess 21 (see FIG. 6) that bulges inside. The recess 21 is provided at the intersection with the rear cushion unit 13 and is formed in a U-shaped groove to avoid the reaction unit 13.

  In the air cleaner 16, as shown in FIGS. 4 and 6, one side rear space adjacent to the recess 21 in the internal space of the case body 17 in which the recess 21 is formed is provided as a dirty side chamber 22. A clean side chamber 23 is provided in the interior space of the case body 17 and the outer cover 18 with the filter 19 of the inner cover 20 separated from the dirty side chamber 22.

  That is, the partition wall 24 is formed integrally with the case body 17 on the inner side of the case body 17 and behind the recess 21 in the vehicle. Further, as shown in FIGS. 3 and 6, the inner cover 20 has a constricted space 23B and an internal space 23C (both described later) on the case body 17 side, and an internal space 23A (described later) on the outer cover 18 side in front of the vehicle. And a filter 19 is installed behind the vehicle. By attaching the inner cover 20 to the case body 17, a dirty side chamber 22 defined by the case body 17, the partition wall 24, and the filter 19 of the inner cover 20 is provided at the rear portion of the air cleaner 16.

  The outer cover 18 is attached to the case body 17 together with the inner cover 20. The clean side chamber 23 includes an inner space 23 </ b> A of the outer cover 18, a constricted space 23 </ b> B corresponding to the recess 21 in the case body 17, and an inner space 23 </ b> C in front of the vehicle opposite to the dirty side chamber 22 across the recess 21 in the case body 17. Are configured to communicate with each other. Cleaning air purified by the filter 19 of the inner cover 20 is guided to the clean side chamber 23.

  As shown in FIGS. 4 and 5, in the dirty side chamber 22, a single intake pipe 27 serving as an intake passage is provided in a suction portion 36 having a suction port 26 provided in front of the recess 21 of the case body 17. Are connected, and the intake air from the suction port 26 is introduced into the dirty side chamber 22. That is, the case body 17 is provided with a suction portion 36 on the upper surface thereof and in front of the recess 21 so as to overlap the rear cushion unit 13 when viewed from the rear of the vehicle, and the intake pipe 27 is provided in the suction portion 36. Is connected. The intake pipe 27 passes through the internal space 23C, the constricted space 23B, and the internal space 23A of the clean side chamber 23, penetrates the partition wall 24 of the case body 17, and enters the dirty side chamber 22.

  The intake pipe 27 is disposed in the dirty side chamber 22 so as to be curved from the upper side to the lower side along the periphery of a resonator 31 (described later), and in the dirty side chamber 22, an outlet is provided below the lower end 19 </ b> A of the filter 19. 28 is positioned. Further, the outlet 28 of the intake pipe 27 is positioned above the bottom 29 of the dirty side chamber 22 by a predetermined distance t.

  An outlet pipe 30 that connects the clean side chamber 23 of the air cleaner 16 and a throttle body (not shown) is connected to the front portion of the case body 17. The air introduced into the dirty side chamber 22 from the suction port 26 of the suction portion 36 through the intake pipe 27 is purified by the filter 19 to reach the clean side chamber 23, and the cleaning air in the clean side chamber 23 is It is supplied to the throttle body via the outlet pipe 30.

As shown in FIGS. 3, 4, and 6, a resonator 31 is installed in the dirty side chamber 22. In other words, the dirty side chamber 22, resonator rib 32 is projected integrally with the casing body 17, by resonator cover 33 is attached to the resonator Li Bed 32, resonator 31 is constructed in a closed space. Branch pipe 34 branching from the intake pipe 27 is connected to rush into the resonator 31 through the resonator Li Bed 32 of the resonator 31. When a part of the air in the intake pipe 27 is introduced into the resonator 31, the intake sound generated in the intake pipe 27 is muted.

  As shown in FIG. 4, a drain pipe 35 is connected to the bottom 29 of the dirty side chamber 22 in the case body 17. As a result, rainwater sucked together with air from the suction port 26 during rainy weather is drained from the drain pipe 35 as drain in the dirty side chamber 22.

  With the configuration as described above, the air cleaner 16 according to the present embodiment has the following effects (1) to (7).

  (1) Since the one-side space behind the vehicle adjacent to the recess 21 in the internal space of the case body 17 is provided as the dirty side chamber 22, the pressure of the air introduced into the dirty side chamber 22 via the intake pipe 27. Since the wave does not rapidly change through the constricted space 23B corresponding to the concave portion 21, the intake sound can be reduced. In addition, since the internal space 23C on the opposite side of the dirty side chamber 22 across the recess 21 in the case body 17 is also a part of the clean side chamber 23 together with the constricted space 23B corresponding to the recess 21, the shape of the clean side chamber 23 Is not elongated and has an appropriate volume shape, and the intake noise can be reduced from this point.

  (2) The clean side chamber 23 is located on the front side of the vehicle opposite to the dirty side chamber 22 with the inner space 23A of the outer cover 18, the constricted space 23B corresponding to the recess 21 in the case body 17, and the recess 21 in the case body 17 interposed therebetween. The internal space 23C is configured to communicate with each other. For this reason, the capacity of the clean side chamber 23 is increased. As a result, the air cleaner 16 can sufficiently secure a clean air capacity, and the output of the engine 10 is not reduced.

  (3) In the air cleaner 16, the dirty side chamber 22 is provided at the rear portion of the vehicle. The suction portion 36 for introducing air into the dirty side chamber 22 via the intake pipe 27 is disposed in front of the recess 21 on the upper surface of the case body 17. Provided. For this reason, it becomes difficult to suck the dust wound up by the rear wheel 12 from the suction port 26 of the suction portion 36. Further, since the suction portion 36 is positioned in front of the reaction unit 13 disposed in the recess 21, the stepping stone wound up by the rear wheel 22 is bounced by the reaction unit 13 and enters the air cleaner 16. Can be prevented.

  (4) Since a portion of the intake pipe 27 extending from the suction portion 36 to the dirty side chamber 22 passes through the clean side chamber 23 of the air cleaner 16, the intake pipe 27 is disposed outside the air cleaner 16. Interference with other components (for example, the rear wheel 12 and the reaction unit 13) that occur in some cases can be reliably prevented, and the appearance design of the vehicle can be improved. Further, when the intake pipe 27 is disposed outside the air cleaner 16 due to a part of the intake pipe 27 passing through the clean side chamber 23 of the air cleaner 16, Compared to

  (5) The intake pipe 27 that has entered the dirty side chamber 22 is disposed so as to curve in the dirty side chamber 22 downward from above, and its outlet 28 is positioned below the lower end 19A of the filter 19. For this reason, even when the vehicle is turning, the rainwater introduced into the dirty side chamber 22 through the intake pipe 27 is guided and stored in the bottom 29 of the dirty side chamber 22 and scattered from the outlet 28. Can be prevented. For this reason, it is possible to prevent the filter 19 from being clogged in a wide range by rainwater.

  (6) The outlet 28 of the intake pipe 27 that has entered the dirty side chamber 22 is positioned above the bottom 29 of the dirty side chamber 22 by a predetermined distance t. Therefore, rainwater stored in the bottom 29 of the dirty side chamber 22 does not flow back into the intake pipe 27 and the cross-sectional area near the outlet 28 of the intake pipe 27 does not decrease, thereby preventing a reduction in intake air amount. it can.

  (7) In the intake pipe 27, when the introduced air passes through the inside, the intake sound is generated at a certain pipe length portion (for example, a position 50 mm downstream from the intake port 26 in the intake pipe 27) depending on the specifications of the engine 10. There is a tendency to increase. In the present embodiment, the intake pipe 27 is arranged in the dirty side chamber 22 so as to be curved from the upper side to the lower side along the periphery of the resonator 31, so that the branch pipe 34 is branched from the constant pipe length portion of the intake pipe 27. This branch pipe 34 can be connected to the resonator 31. Thereby, the intake sound generated in the intake pipe 27 can be silenced most effectively by the resonator 31.

  In the present embodiment, the partition wall 24 is formed integrally with the case body 17 and the inner cover 20 is brought into contact with the partition wall 24 to form the dirty side chamber 22. However, the partition wall 24 is not formed on the case body 17. First, a part of the inner cover 20 is protruded toward the case body 17, and this protruding portion is brought into contact with the wall surface corresponding to the recess 21 in the case body 17, thereby defining the dirty side chamber 22. Also good.

  Further, in the present embodiment, the inner cover 20 provided with the filter 19 is sandwiched between the joint surface between the case body 17 and the outer cover 18, but the filter is disposed on the joint surface between the case body 17 and the outer cover 18. You may clamp 19 directly.

[B] Second Embodiment (FIGS. 7 to 10)
FIG. 7 is a left side view showing the second embodiment of the air cleaner according to the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

  The air cleaner 40 of the present embodiment differs from the first embodiment in that, as shown in FIGS. 8 and 10, a part of the intake passage 41 from the suction port 26 to the dirty side chamber 22 is part of the case body. This is a point formed by an intake space 44 partitioned by 42 and an inner cover 43.

  That is, as shown in FIG. 9, the partition plate 45 extending in the vehicle front-rear direction is integrally formed inside the case body 42. Inside the case body 42, in the region 46 above the partition plate 45, the other end 48 of the first pipe 47 whose one end is connected to the suction portion 36, and the intake pipe 27 of the above embodiment in the dirty side chamber 22. And the inlet 50 of the second pipe 49 arranged in the same manner as in FIG. Further, the inner cover 43 is provided with a cap portion 51 (FIG. 8) at a position corresponding to the region 46 when attached to the case body 42.

  Therefore, the intake space 44 is formed by the cap portion 51 of the inner cover 43 covering the region 46 of the case body 42 as shown in FIG. 10 with the case body 42 and the inner cover 43 attached. The air introduced from the suction port 26 of the suction portion 36 reaches the intake space 44 from the first pipe 47, further passes through the second pipe 49, and is introduced into the dirty side chamber 22 from the outlet 28 of the second pipe 49. The

  Since the second embodiment is configured in the same manner as the first embodiment with respect to points other than the intake passage 41 described above, the effects of the first embodiment also in this embodiment ( The same effects as 1) to (7) are obtained. Further, in the present embodiment, a part of the intake passage 41 is constituted by the case body 42 and the inner cover 43, and the length of the pipe portion of the intake passage 41 can be shortened, so that the cost of the air cleaner 40 can be reduced.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this. For example, in each of the embodiments, the case of an air cleaner applied to a scooter type motorcycle has been described. However, the present invention may be applied to an air cleaner of a motorcycle other than the scooter type. Further, the present invention may be applied not only to motorcycles but also to air cleaners for four-wheeled vehicles.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 8 Power unit 9 Seat rail 10 Engine 11 Power transmission device 12 Rear wheel 13 Reaction unit 16 Air cleaner 17 Case body 18 Outer cover 19 Filter 19A Filter lower end 20 Inner cover 21 Recess 22 Dirty side chamber 22 Clean side chamber 26 Suction port 27 Intake pipe 28 Outlet 29 Bottom 31 Resonator 34 Branch pipe 40 Air cleaner 41 Intake passage 42 Case body 43 Inner cover 44 Intake space 51 Cap part t Fixed distance

Claims (5)

A rear wheel is attached to the rear portion of the power unit in which the engine and the power transmission device are integrated, and the power unit is pivotally supported with respect to the vehicle body frame,
A recess that is disposed above the power unit and below the rear part of the body frame, the case body and the outer cover are joined, and a filter is sandwiched between the joint surfaces, and is a recess that bulges into the case body. In the air cleaner formed with
A rear space adjacent to the concave portion in the internal space of the case body provided with the concave portion is provided as a dirty side chamber,
A clean side chamber is provided in the internal space of the case body and the outer cover with the filter separated from the dirty side chamber ,
The recess is formed at the intersection of the rear portion of the vehicle frame and the rear cushion unit that is stretched up and down on the power unit, avoiding the rear cushion unit,
The dirty side chamber is configured to be connected to an intake passage extending from a suction port provided in front of the recess to introduce intake air.
In the dirty side chamber, a resonator into which a part of the air in the intake passage is introduced is disposed in a space surrounded by the intake passage that is curved in the vertical direction along the rear peripheral wall in the dirty side chamber. air cleaner, characterized in that it is. The air cleaner according to claim 1 , wherein the intake passage is connected to the dirty side chamber from the suction port through the clean side chamber. The branch pipe branching from the intake passage, an air cleaner according to claim 1 or 2, characterized in that connected to the rear wall of said resonator. 4. The resonator according to claim 1, wherein the resonator is formed in a closed space by attaching a cover to a circumferential rib projecting from the case body in a vehicle width direction. 5. Air cleaner. The intake passage, a part of the passage leading to the dirty side chamber from the suction port, to any one of claims 1 to 4, characterized in that it is constituted by a space defined by the case body and the inner cover The listed air cleaner.

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