Patent Publication Number: US-8991533-B2

Title: Air cleaner device

Description:
BACKGROUND 
     1. Field 
     The present invention relates an air cleaner device. 
     2. Description of the Related Art 
     A known air cleaner device is shown in Japanese Patent No. 3,466,702, and includes an air cleaner case and an air cleaner element, the air cleaner case including a case main unit and a cover and the air cleaner element being disposed in a position biased on the side of the cover relative to a fastening surface between the case main unit and the cover. In such an air cleaner device, the air cleaner element has a peripheral edge portion fitted via a seal into a peripheral groove formed in each of peripheral edge portions of an upward opening portion in the case main unit and a downward opening portion in the cover and the case main unit is tightly integrated with the cover with screws tightened into each mounting hole therein. 
     PRIOR ART DOCUMENT 
     Patent Document 
     In the air cleaner device disclosed in Japanese Patent No. 3,466,072 (Patent Document 1), when the air cleaner element is to be replaced with a new one or when the air cleaner device otherwise needs servicing, it is necessary to raise the cover to a level higher than a height of the air cleaner element before the cover can be removed after the screws have been removed. This requires a working space for at least the height of the air cleaner element in a direction to detach the cover, such as upward. Consequently, a vehicle mounted with the known air cleaner device is restricted in parts layout and may need to be much larger in size because of the requirement for the space for servicing around the air cleaner case. 
     SUMMARY 
     The present invention has been made in view of the foregoing situations; it is an object of the present invention to provide an air cleaner device that can improve maintainability without having to build a vehicle unnecessarily large. 
     To achieve the foregoing object, a first aspect of the present invention provides an air cleaner device which can include an air cleaner case that includes a case main unit and a cover and an intake duct disposed on the cover. An intake path can be disposed on the case main unit and connected to an engine, An air cleaner element can be formed in a position biased on a side of the cover relative to fastening surfaces of the case main unit and the cover. In this air cleaner device, the cover and the air cleaner element are integrally removable relative to the case main unit. 
     In a second aspect of the present invention, in addition to the arrangements of the first aspect of the present invention, the cover and the air cleaner element can be integrally held by a plurality of holding portions. 
     In a third aspect of the present invention, in addition to the arrangements of the first or second aspect of the present invention, the holding portions can be disposed at three places. 
     In a fourth aspect of the present invention, in addition to the arrangements of any one of the first to third aspects of the present invention, the holding portions can be disposed, when mounted in a vehicle, at a front surface central portion and left and right side surfaces of the cover and the air cleaner element. 
     In a fifth aspect of the present invention, in addition to the arrangements of any one of the first to fourth aspects of the present invention, the cover can have a drain portion disposed at part of a peripheral edge portion of the cover, the drain portion for discharging or draining any fluid which may accumulate therein. The air cleaner element and the case main unit have drain holes formed in peripheral edge portions thereof, the drain holes communicating with the drain portion. 
     In a sixth aspect of the present invention, in addition to the arrangements of any one of the first to fifth aspects of the present invention, the air cleaner case can be disposed, when mounted in a vehicle, in an inclined position such that a rear portion thereof is disposed downwardly of a front portion thereof. The drain portion and the drain holes are disposed at the rear portion of the air cleaner case. 
     In a seventh aspect of the present invention, in addition to the arrangements of any one of the first to sixth aspects of the present invention, a vehicle on which the air cleaner device is mounted can include a side stand disposed on one side thereof in a vehicle width direction. The drain portion and the drain holes are disposed on the same side as the side stand. 
     In an eighth aspect of the present invention, in addition to the arrangements of any one of the first to seventh aspects of the present invention, when mounted in the vehicle, the air cleaner case can be disposed forwardly of a storage box. The air cleaner case is disposed downwardly in a perpendicular direction of a front end of an upper portion of the storage box. 
     In the first aspect of the present invention, the air cleaner device includes the air cleaner element formed in a position biased on the side of the cover relative to the fastening surfaces of the case main unit and the cover. The air cleaner case also allows the cover and the air cleaner element to be integrally removed or reinstalled relative to the case main unit. Therefore, even if there is little space available upwardly of the cover and accordingly the cover cannot be raised, the cover and the air cleaner element can be removed or reinstalled relative to the case main unit by simply slidingly moving the cover and the air cleaner element integrally in the width direction. This eliminates the need for having a large space for servicing around the air cleaner case, so that the parts can be compactly configured or disposed. The vehicle can therefore be prevented from becoming unnecessarily large in size, and maintainability of the air cleaner device can be improved. 
     In the second aspect of the present invention, the cover and the air cleaner element can be integrally held by a plurality of holding portions. The cover and the air cleaner element can therefore be reliably removed or reinstalled, while preventing the cover and the air cleaner element from deviating from each other. 
     In the third aspect of the present invention, the holding portions can be disposed at three places, so that the cover and the air cleaner element can be even more reliably removed or reinstalled relative to the case main unit. 
     In the fourth aspect of the present invention, the holding portions can be disposed, when mounted in a vehicle, at a front surface central portion and left and right side surfaces of the cover and the air cleaner element. This allows an operator to slidingly move the cover and the air cleaner element by supporting with both hands the holding portions on both side surfaces, with the cover and the air cleaner element engaged with each other using the holding portions at the front central portion. This achieves good maintainability of the air cleaner device without having a large space for servicing around the air cleaner case. 
     In the fifth aspect of the present invention, the cover can have a drain portion for draining or discharging fluid, disposed at part of a peripheral edge portion of the cover and the air cleaner element and the case main unit have drain holes formed communicating with the drain portion in peripheral edge portions thereof. Fluid can therefore be efficiently discharged without having to incorporate a drain part separately. In addition, the drain portion or the drain hole disposed in the peripheral edge portion of the cover, the air cleaner element, or the case main unit, no restriction is therefore imposed on the size of the filter portion disposed at the central portion of the air cleaner element. 
     In the sixth aspect of the present invention, the air cleaner case is disposed, when mounted in a vehicle, in an inclined position such that the rear portion thereof is disposed downwardly of the front portion thereof and the drain portion and the drain holes are disposed at the rear portion of the air cleaner case. This allows drain in the air cleaner case to be efficiently collected in the rear portion thereof. Drain can therefore be efficiently discharged by disposing the minimum essential drain portion and the drain holes in the rear portion of the air cleaner case. 
     In the seventh aspect of the present invention, the side stand is disposed on the one side of the vehicle in which the air cleaner device is mounted and the drain portion and the drain holes are disposed on the same side as the side stand. When the side stand is deployed, the vehicle is inclined to the side of the side stand and the air cleaner device is also inclined to the side of the side stand. As compared with an arrangement in which the drain portion and the drain holes are disposed on the side opposite to the side stand, draining performance can be improved. 
     In the eighth aspect of the present invention, when the air cleaner device is mounted in the vehicle, the storage box is disposed rearwardly of the air cleaner case and the air cleaner case is disposed downwardly in the perpendicular direction of a front end of an upper portion of the storage box. Therefore, the air cleaner case can be compactly disposed without allowing the same to protrude upwardly from the storage box, while a storage space is secured in the storage box. This makes for improved design efficiency and appearance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a left side elevational view for illustrating a motorcycle in which one embodiment of an air cleaner device according to the present invention is mounted. 
         FIG. 2  is a left side elevational view showing the air cleaner device and a storage box shown in  FIG. 1 . 
         FIG. 3  is a longitudinal cross-sectional view showing the air cleaner device shown in  FIG. 2 . 
         FIG. 4  is an enlarged view showing part A shown in  FIG. 3 . 
         FIG. 5  shows a case main unit shown in  FIG. 3 , as viewed from above. 
         FIG. 6  shows a cover shown in  FIG. 3 , as viewed from the bottom. 
         FIG. 7  shows an air cleaner element shown in  FIG. 3 , as viewed from the bottom. 
     
    
    
     DETAILED DESCRIPTION 
     One preferred embodiment of an air cleaner device to which the present invention is applied will be described in detail below, with reference to the accompanying drawings. The drawings should be viewed in the direction of reference symbols. Throughout the descriptions given hereunder, expressions indicating directions including front and rear, right and left, and upper and lower mean the same directions as those as viewed from a rider. In the drawings, an arrow Fr indicates forward of the vehicle, an arrow Rr indicates rearward of the vehicle, an arrow L indicates leftward of the vehicle, an arrow R indicates rightward of the vehicle, an arrow U indicates upward of the vehicle, and an arrow D indicates downward of the vehicle. 
     Referring to  FIG. 1 , a motorcycle  10  includes a vehicle body frame  11  which is covered, at least in part, in a vehicle body cover or fairing  20 , for example, made of a synthetic resin. 
     The vehicle body frame  11  can include a head pipe  12 , a pair of left and right main frames  13 , a pair of left and right center frames  14 , and a pair of left and right down frames  15 . Specifically, the head pipe  12  is disposed at a front end of the vehicle body frame  11 . The main frames  13  extend obliquely downwardly toward the rear from the left and right of an upper portion of the head pipe  12 . The center frames  14  extend horizontally toward the rear from rear ends of the main frames  13  and are then bent in a rearwardly protruding condition to extend downwardly. The down frames  15  extend obliquely downwardly toward the rear from the left and right of a lower portion of the head pipe  12 . The vehicle body frame  11  further includes, though not shown, a pair of left and right seat stays and a pair of left and right middle frames extending rearwardly from rear upper portions and rear end portions, respectively, of the center frames  14  and having respective rear ends connected to each other. 
     The head pipe  12  can support a pair of left and right front forks  21  steerably to the right and left. The front forks  21  extend downwardly to journal a front wheel WF at lower ends thereof. A steering handlebar  22  is connected to upper portions of the front forks  21 . A pivot plate  23  is disposed on the center frames  14 . The pivot plate  23  rotatably supports a front end of a rear fork  24  via a pivot bolt 23 Å. The rear fork  24  journals a rear wheel WR at a rear end thereof and is vertically swingably supported via a rear cushion not shown. 
     An occupant seat  25  can be disposed upwardly of the pair of left and right seat stays. The occupant seat  25  integrates a rider&#39;s seat with a pillion. Though not shown, a fuel tank can be disposed between rear portions (between the seat stays and the middle frames) of the vehicle body frame  11 . 
     First and second reinforcement frames  16 ,  17  are disposed between the main frames  13  and the down frames  15  that are disposed vertically wide apart. The first and the second reinforcement frames  16 ,  17  connect between the main frame  13  and the down frame  15 . Specifically, the first reinforcement frame  16  can extend rearwardly from a front end portion of the down frame  15  to connect between the down frame  15  and the main frame  13 . The second reinforcement frame  17  extends downwardly from the main frame  13  at a position near a rear end of the first reinforcement frame  16  to thereby connect between the main frame  13  and the down frame  15 . 
     An engine or power unit  30  can be supported downwardly of the main frames  13  and horizontal portions  14 A of the center frames  14 , and forwardly of downward extensions  14 B of the center frames  14 . In this example, the engine  30  is a water-cooled, parallel two-cylinder engine, including a cylinder portion  32  that is inclined upwardly toward the front from a front upper portion of a crankcase  31 . As with other aspects of the vehicle in this embodiment of the invention, other engine or power unit configurations could be applicable. The engine  30  is supported as detailed below. Specifically, the front upper portion of the crankcase  31  is supported by rear end portions  13 A of the left and right main frames  13 , a rear upper portion of the crankcase  31  is supported by a pair of left and right engine hangers  14 C disposed between the horizontal portions  14 A and the downward extensions  14 B of the center frames  14 , and the cylinder portion  32  is supported by rear end portions  15 A of the left and right down frames  15 . 
     The cylinder portion  32  includes a cylinder block  32 A, a cylinder head  32 B, and a cylinder head cover  32 C. Specifically, the cylinder block  32 A is connected to the front upper portion of the crankcase  31 . The cylinder head  32 B is connected to an upper portion of the cylinder block  32 A. The cylinder head cover  32 C covers an upper portion of the cylinder head  32 B. In addition, an oil pan  33  is connected to a lower end portion of the crankcase  31 . A radiator  41  is disposed forwardly of the cylinder head cover  32 C. A side stand  42  is attached to a lower end portion of the center frame  14  on the left side of the vehicle. 
     A rotatable or rotating driving force outputted from the engine  30  is transmitted to the rear wheel WR, in this example, via an output shaft  43  provided in a protruding condition on the left side surface of a rear portion of the crankcase  31 , a drive sprocket  44  mounted on the output shaft  43 , a driven sprocket  45  mounted on the left side of the rear wheel WR, and a drive chain  46  trained across the drive sprocket  44  and the driven sprocket  45 . 
     Referring to  FIGS. 1 and 2 , a throttle body  50  and an air cleaner device  60  making up an engine air intake system can be connected in sequence to a back surface of the cylinder head  32 B. An exhaust pipe  47  and a muffler  48  making up an engine exhaust system are connected in sequence to a front surface of the cylinder head  32 B. 
     The throttle body  50  is mounted via an insulator  51  on an intake manifold portion  34  that is formed on the back surface of the cylinder head  32 B. The air cleaner device  60  is connected to an upstream end of the throttle body  50 . 
     Referring to  FIGS. 2 and 3 , the air cleaner device  60 , disposed upwardly of the throttle body  50 , can include an air cleaner case  61 , an air cleaner element  64 , an intake tube (intake path)  65 , and an intake duct  66 . More specifically, the air cleaner case  61  includes a case main unit  62  and a cover  63 , the case main unit  62  forming a lower half and the cover  63  forming an upper half. The air cleaner element  64  is clamped between the case main unit  62  and the cover  63 . The air cleaner element  64  removes dust and dirt from an intake air. The intake tube  65  is disposed on a lower surface of the case main unit  62 , connecting the upstream end of the throttle body  50  and the air cleaner case  61 . The intake duct  66  is disposed on a front surface of the cover  63 , guiding the intake air into the air cleaner case  61 . In addition, the air cleaner case  61  is disposed in an inclined position such that a rear portion thereof is disposed downwardly of a front portion thereof in a vehicle side view. 
     The air cleaner case  61  can be partitioned into upper and lower halves by the air cleaner element  64 . An upper space above the air cleaner element  64  forms a dirty room or dirty section  67  to which intake air guided into the intake duct  66  is supplied. A lower space below the air cleaner element  64  forms a clean room or clean section  68  to which intake air from which dust and dirt are removed is supplied. 
     Referring to  FIGS. 3 to 5 , in this example, the case main unit  62  has a bottom and can be shaped substantially into an ellipse in an upward-looking view. The case main unit  62  includes a fastening surface  62   a  to be fastened to the cover  63  on a peripheral edge portion thereof. The fastening surface  62   a  has a peripheral groove  71  in which a lower protruding portion  93   a  formed along a peripheral edge portion of the air cleaner element  64  to be described later is fitted. In  FIG. 5 , reference symbol  72  denotes a tube mounting hole for mounting the intake tube  65  and reference symbol  73  denotes six internally threaded portions into which screws are threaded for fastening the cover  63  to the case main unit  62 . 
     Referring to  FIGS. 3 ,  4 , and  6 , the cover  63  has a bottom and is shaped substantially into an ellipse in an upward-looking view. The cover  63  includes a fastening surface  63   a  to be fastened to the case main unit  62  on a peripheral edge portion thereof. The fastening surface  63   a  has a peripheral groove  81  in which an upper protruding portion  93   b  formed along a peripheral edge portion of the air cleaner element  64  to be described later is fitted. In  FIG. 6 , reference symbol  82  denotes a duct mounting hole for mounting the intake duct  66  and reference symbol  83  denotes six screw threadable portions for passing screws through the six internally threaded portions  73  in the case main unit  62 . 
     Referring to  FIGS. 3 ,  4 , and  7 , the air cleaner element  64  includes a filter portion  91  and a filter supporting unit  92 . Specifically, the flat sheet-like filter portion  91  removes dust and dirt from the intake air. The filter supporting unit  92  supports the filter portion  91  in the air cleaner case  61 . 
     The filter supporting unit  92  includes an outer frame portion (peripheral edge portion)  93 , a tube portion  94 , and an inner frame portion  95 . Specifically, the outer frame portion  93  is a sheet-like member shaped to be fitted into the peripheral grooves  71 ,  81  in the case main unit  62  and the cover  63 , respectively. The tube portion  94  extends upwardly from an inner peripheral portion of the outer frame portion  93 . The inner frame portion  95  extends upwardly from an inner peripheral portion of the tube portion  94 . The filter portion  91  is mounted inside the inner frame portion  95 . The filter portion  91  is disposed by the filter supporting unit  92  on the side of the cover  63  relative to the fastening surfaces  62   a ,  63   a  of the case main unit  62  and the cover  63 , respectively. Consequently, the air cleaner element  64  is disposed in a position biased on the side of the cover  63  relative to the fastening surfaces  62   a ,  63   a.    
     In addition, the outer frame portion  93  includes the lower protruding portion  93   a  and the upper protruding portion  93   b  formed downwardly on a lower surface and upwardly on an upper surface, respectively, along an outer peripheral portion of the outer frame portion  93 . Specifically, the lower protruding portion  93   a  is fitted into the peripheral groove  71  in the case main unit  62 , while the upper protruding portion  93   b  is fitted into the peripheral groove  81  in the cover  63 . Additionally, seals  71   a ,  81   a  inserted between the lower protruding portion  93   a  and the upper protruding portion  93   b  are fitted in bottom portions of the peripheral grooves  71 ,  81 , respectively. 
     Referring to  FIGS. 4 to 7 , the outer frame portion  93  further has an engagement loop (holding portion)  96  formed to face the forward direction of the vehicle at a front central portion on the outer peripheral surface thereof. The cover  63  has an engagement hook (holding portion)  84  formed to face downwardly at a front central portion on the outer peripheral surface thereof near the fastening surface  63   a . The engagement hook  84  is to be engaged with the engagement loop  96 . Outer wall portions  71   b ,  81   b  that form the peripheral grooves  71 ,  81  of the case main unit  62  and the cover  63 , respectively, have fitting recessed portions  71   c ,  81   c  that allow the engagement loop  96  to be engaged and fixed without interference each other. The fitting recessed portions  71   c ,  81   c  are disposed at positions corresponding to the engagement loop  96 . 
     In addition, the outer frame portion  93  has holding protrusions (holding portions)  97 , onto which an operator can hold his or her both hands, each being formed to face the outside in the vehicle width direction at a substantially central position on each side surface of the outer peripheral surface. The outer wall portions  71   b ,  81   b  that form the peripheral grooves  71 ,  81 , respectively, have fitting recessed portions  71   d ,  81   d  that allow the holding protrusions  97  to be engaged and fixed without interference each other. The fitting recessed portions  71   d ,  81   d  are disposed at positions corresponding to the holding protrusions  97 . 
     In the air cleaner device  60  according to the embodiment of the present invention, the cover  63  and the air cleaner element  64  are integrally held at three places when the engagement hook  84  is engaged with the engagement loop  96  and the operator holds onto the holding portions  97  with his or her both hands. This allows the cover  63  and the air cleaner element  64  to be integrally removed or reinstalled relative to the case main unit  62 . More specifically, with the cover  63  and the air cleaner element  64  integrally held in position, the cover  63  and the air cleaner element  64  are raised such that the lower protruding portion  93   a  of the air cleaner element  64  is disengaged from the peripheral groove  71  in the case main unit  62  and are slidingly moved in the vehicle width direction. 
     Referring to  FIGS. 5 to 7 , the cover  63  includes a recessed portion  85  formed at a rear portion thereof between the screw threadable portions  83 . The recessed portion  85  includes a drain portion  86  for discharging drain, disposed on an inner surface at the left corner thereof. Additionally, the outer frame portion  93  of the air cleaner element  64  includes a protruding tab  98  formed on an outer peripheral surface thereof at a position corresponding to the drain portion  86 . The protruding tab  98  has a drain hole  98   a  that communicates with the drain portion  86 . In addition, the fastening surface  62   a  of the case main unit  62  has a drain hole  74  at a position corresponding to the drain portion  86 . The drain hole  74  communicates with the drain portion  86  and the drain hole  98   a . Therefore, the drain portion  86 , the drain hole  98   a , and the drain hole  74  communicate with each other and are formed along the vertical direction on the left side of the vehicle where the rear end portion of the air cleaner case  61  and the side stand  42  are disposed. Further, an inner wall portion  81   e  that forms the peripheral groove  81  of the cover  63  has a recessed portion  81   f  disposed at a position corresponding to the protruding tab  98 , in which the protruding tab  98  is to be fitted. 
     Referring to  FIG. 2 , a storage box  100  is disposed rearwardly of the air cleaner case  61  and upwardly of the pair of left and right center frames  14 . The storage box  100  includes a box main unit  101  and a lid portion  102 . Specifically, the box-like box main unit  101  is fixed to the pair of left and right center frames  14 . The lid portion  102  opens or closes the box main unit  101 . The lid portion  102  is to be swung open or closed about a hinge  103  disposed at an upper end of a rear portion of the box main unit  101 . The storage box  100  has a capacity of being able to store, at least, a full face helmet  26 . 
     A lock mechanism accommodating portion  104  can be disposed in this example in a forwardly protruding condition at a front end of an upper portion of the storage box  100 . The lock mechanism accommodating portion  104  accommodates a lock mechanism not shown for locking or unlocking the lid portion  102 . The air cleaner case  61  has an upper portion and a rear portion disposed downwardly of the lock mechanism accommodating portion  104  in a perpendicular direction. This arrangement allows a storage space inside the storage box  100  to be increased, as compared with an arrangement in which the lock mechanism is housed inside the box main unit  101 . 
     Additionally, the air cleaner case  61  can be disposed in a position inclined relative to a front surface of the storage box  100  in a vehicle side view. A battery  110 , a fuse box  111 , and an inclination sensor  112  as electrical components are disposed between a rear surface of the air cleaner case  61  and the front surface of the storage box  100 . 
     As described heretofore, the air cleaner device  60  according to one embodiment of the present invention can include the air cleaner element  64  formed in a position biased on the side of the cover  63  relative to the fastening surfaces  62   a ,  63   a  of the case main unit  62  and the cover  63 . The air cleaner case  61  also allows the cover  63  and the air cleaner element  64  to be integrally removed or reinstalled relative to the case main unit  62 . Therefore, even if there is little space available upwardly of the cover  63  and accordingly the cover  63  cannot be raised, the cover  63  and the air cleaner element  64  can be removed or reinstalled relative to the case main unit  62  by simply slidingly moving the cover  63  and the air cleaner element  64  integrally in the width direction. This eliminates the need for having a large space for servicing around the air cleaner case  61 , so that the parts can be compactly disposed. The motorcycle  10  can therefore be prevented from becoming unnecessarily large in size, and maintainability of the air cleaner device  60  can be improved. 
     In the air cleaner device  60  according to one embodiment of the present invention, the cover  63  and the air cleaner element  64  are integrally held at three places of the engagement hook  84  and the engagement loop  96 , and the holding protrusions  97 ,  97  and the fitting recessed portions  81   d ,  81   d . The cover  63  and the air cleaner element  64  can therefore be even more reliably removed or reinstalled relative to the case main unit  62 , while preventing the cover  63  and the air cleaner element  64  from deviating from each other. 
     In the air cleaner device  60  according to one embodiment of the present invention, the engagement hook  84  and the engagement loop  96  as the holding portions are disposed at the central portion on the front surface of the cover  63  and the air cleaner element  64 . The holding protrusions  97 ,  97  and the fitting recessed portions  81   d ,  81   d  as the holding portions can be disposed on the left and right side surfaces of the cover  63  and the air cleaner element  64 . This can allow the operator to slidingly move the cover  63  and the air cleaner element  64  by supporting with his or her both hands the holding protrusions  97 ,  97  and the fitting recessed portions  81   d ,  81   d  on both sides, with the cover  63  and the air cleaner element  64  engaged with each other using the engagement hook  84  and the engagement loop  96  at the front central portion. This achieves good maintainability of the air cleaner device  60  without needing a large space for servicing around the air cleaner case  61 . 
     In the air cleaner device  60  according to one embodiment of the present invention, the cover  63  can have the drain portion  86  for discharging fluid, disposed at a part of the peripheral edge portion thereof and the air cleaner element  64  and the case main unit  62  have the drain holes  98   a ,  74  that communicate with the drain portion  86 , disposed in the peripheral edge portions thereof. Fluid can therefore be efficiently drained or discharged without having to incorporate a drain part separately. In addition, the drain portion  86  or the drain hole  98   a ,  74  disposed in the peripheral edge portion of the cover  63 , the air cleaner element  64 , or the case main unit  62  imposes no restriction on the size of the filter portion  91  disposed at the central portion of the air cleaner element  64 . 
     In the air cleaner device  60  according to one embodiment of the present invention, the air cleaner case  61  can be disposed in an inclined position such that the rear portion thereof is disposed downwardly of the front portion thereof and the drain portion  86  and the drain holes  98   a ,  74  are disposed at the rear portion of the air cleaner case  61 . This allows fluid in the air cleaner case  61  to be efficiently collected in the rear portion thereof. Fluid can therefore be efficiently discharged by disposing the minimum essential drain portion  86  and the drain holes  98   a ,  74  in the rear portion of the air cleaner case  61 . 
     In the air cleaner device  60  according to one embodiment of the present invention, the side stand  42  can be disposed on the left side of the vehicle and the drain portion  86  and the drain holes  98   a ,  74  are disposed on the same side as the side stand  42 . When the side stand  42  is deployed, the motorcycle  10  is inclined to the side of the side stand  42  and the air cleaner device  60  is also inclined to the side of the side stand  42 . As compared with an arrangement in which the drain portion  86  and the drain holes  98   a ,  74  are disposed on the side opposite to the side stand  42 , draining performance can be improved. 
     In the air cleaner device  60  according to one embodiment of the present invention, the storage box  100  can be disposed rearwardly of the air cleaner case  61  and the air cleaner case  61  is disposed downwardly in the perpendicular direction of the lock mechanism accommodating portion  104  disposed at the front end of the upper portion of the storage box  100 . Therefore, the air cleaner case  61  can be compactly disposed without allowing the same to protrude upwardly from the storage box  100 , while a storage space is secured in the storage box  100 . This makes for improved design efficiency and appearance. 
     DESCRIPTION OF REFERENCE SYMBOLS 
     
         
           10 : Motorcycle 
           30 : Engine 
           42 : Side stand 
           60 : Air cleaner device 
           61 : Air cleaner case 
           62 : Case main unit 
           62   a : Fastening surface (peripheral edge portion) 
           63 : Cover 
           63   a : Fastening surface (peripheral edge portion) 
           64 : Air cleaner element 
           74 : Drain hole 
           81   b : Outer wall portion 
           81   d : Fitting recessed portion (holding portion) 
           84 : Engagement hook (holding portion) 
           86 : Drain portion 
           92 : Filter supporting unit 
           93 : Outer frame portion (peripheral edge portion) 
           96 : Engagement loop (holding portion) 
           97 : Holding protrusion (holding portion) 
           98 : Protruding tab 
           98   a : Drain hole 
           65 : Intake tube (intake path) 
           66 : Intake duct 
           100 : Storage box