Patent Publication Number: US-2020290702-A1

Title: Electrical component mounting structure for saddled vehicle

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to electrical component mounting structures for saddled vehicle, and more particularly relates to an electrical component mounting structure for saddled vehicle capable of concentrating a plurality of electrical components at a position close to the center of the vehicle body. 
     2. Description of the Background 
     Conventionally electrical component mounting structures for saddled vehicle have been known, which concentrate a plurality of electrical components at a position close to the center of the vehicle body. 
     Patent Literature 1 discloses an electrical component mounting structure for a motorcycle having a pair of left and right seat frames. This structure includes a single stay fixed to the seat frames, and fixes an ABS modulator and an inertial sensor to this single stay so as to place the ABS modulator and the inertial sensor side by side between the left and right seat frames. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Patent Application Publication No. 2017-47711 
     BRIEF SUMMARY 
     Many parts of the surface of these ABS modulator and inertial sensor are exposed to the outside in the structure of Patent Literature 1, and so this structure still has room for improvement in the effect of protecting the electrical components from external factors, such as water, flying stones, and access by third party, or for the concentration of more electrical components. 
     The present invention solves the problem of the conventional techniques, and provides an electrical component mounting structure for saddled vehicle capable of concentrating a plurality of electrical components at a position close to the center of the vehicle body while enhancing the protective effect for the electrical components. 
     To fulfill the above, the first aspect of the embodiments provides an electrical component mounting structure for a saddled vehicle ( 1 ) including a vehicle body frame (F) supporting a power unit (P) of the saddled vehicle ( 1 ), a rear wheel (WR) that rotates by a driving force from the power unit (P), a seat ( 33 ), on which a rider sits, and a control device ( 92 ,  94 ) configured to control the vehicle, the electrical component mounting structure being configured to place the control device ( 92 ,  94 ) at a position surrounded with the vehicle body frame (F), the rear wheel (WR), and the seat ( 33 ), the electrical component mounting structure including:
         a case member ( 60 ) to place the control device ( 92 ,  94 ), the case member ( 60 ) including
           a lower case ( 80 ) storing a drive unit ( 50 ), and   an upper case ( 70 ) joining to the lower case ( 80 ) and covering the lower case ( 80 ) from the above,   
           the case member ( 60 ) having a sensor storage part ( 71 ) at a front end, the sensor storage part ( 71 ) storing a sensor ( 90 ); and
           the control device ( 92 ,  94 ) attached to the upper case ( 70 ).   
               

     The second aspect of the embodiments provides that the sensor storage part ( 71 ) includes a container ( 71   b ) storing the sensor ( 90 ) and a lid ( 71   a ) that covers the container ( 71   b ) from the above, 
     the lid ( 71   a ) is located at a front end of the upper case ( 70 ), and
         the container ( 71   b ) is located at a front end of the lower case ( 80 ).       

     The third aspect of the embodiments provides that a rear cushion ( 34 ) is disposed forward and downward of the sensor storage part ( 71 ), and
         the rear cushion ( 34 ) absorbs vibrations of a swing arm ( 24 ) that rotatably supports the rear wheel (WR).       

     The fourth aspect of the embodiments provides that a fuel tank ( 2 ) is disposed above the sensor storage part ( 71 ). 
     The fifth aspect of the embodiment provides that attachment of the upper case ( 70 ) and the lower case ( 80 ) define a side opening ( 58 ) between the upper case ( 70 ) and the lower case ( 80 ). 
     The sixth aspect of the embodiments provides that the control device ( 92 ,  94 ) includes
         a first control device ( 92 ) stored in a storage recess ( 70   a ) of the upper case ( 70 ), and
           a second control device ( 94 ) that is positioned above and adjacent to the first control device ( 92 ).   
               

     The seventh aspect of the embodiments provides that the upper case ( 70 ) is integral with a first lock plate ( 74 ) and a second lock plate ( 73 ) that are positioned at a rear end of the upper case ( 70 ), the first lock plate ( 74 ) and the second lock plate ( 73 ) being turnable around the rear end of the upper case ( 70 ),
         the first lock plate ( 74 ) turns forward to press an upper face of the first control device ( 92 ) stored in the storage recess ( 70   a ),   the second control device ( 94 ) is positioned above and adjacent to the first control device ( 92 ) having the first lock plate ( 74 ) between the first and second control devices ( 92 ,  94 ),   the second lock plate ( 73 ) turns forward to press an upper face of the second control device ( 94 ), and
           the first lock plate ( 74 ) and the second lock plate ( 73 ) have forward ends that engage with an upper face of the upper case ( 70 ).   
               

     The eighth aspect of the embodiments provides that the case member ( 60 ) has a bottom face, and a regulator ( 53 ) is attached to the bottom face. 
     The ninth aspect of the embodiments provides that the case member ( 60 ) has, at its rear end, a cylindrical recess ( 70   b ) to position a cylindrical canister ( 51 ) in proximity to the case member ( 60 ). 
     The tenth aspect of the embodiments provides that a rear fender ( 42 ) is attached to a lower part of the rear end of the case member ( 60 ), and the rear fender ( 42 ) covers the rear wheel (WR) from the front and the above. 
     According to the first aspect, the electrical component mounting structure for a saddled vehicle ( 1 ) including a vehicle body frame (F) supporting a power unit (P) of the saddled vehicle ( 1 ), a rear wheel (WR) that rotates by a driving force from the power unit (P), a seat ( 33 ), on which a rider sits, and a control device ( 92 ,  94 ) configured to control the vehicle, the electrical component mounting structure being configured to place the control device ( 92 ,  94 ) at a position surrounded with the vehicle body frame (F), the rear wheel (WR), and the seat ( 33 ), the electrical component mounting structure including: a case member ( 60 ) to place the control device ( 92 ,  94 ), the case member ( 60 ) including a lower case ( 80 ) storing a drive unit ( 50 ), and an upper case ( 70 ) joining to the lower case ( 80 ) and covering the lower case ( 80 ) from the above, the case member ( 60 ) having a sensor storage part ( 71 ) at a front end, the sensor storage part ( 71 ) storing a sensor ( 90 ); and the control device ( 92 ,  94 ) attached to the upper case ( 70 ). With this configuration, the sensor and the control devices are placed in the case member storing the drive unit. This concentrates a plurality of electrical components and so concentrates their mass. This also eliminates a dedicated stay for attachment of the sensor and the control devices to the vehicle body, and so reduces the number of components. The sensor storage part at the front end of the case member protects the sensor from heat generated at the power unit, flying stones and the like, and also places the sensor at a position close to the vehicle-body center suitable for the measurement of the acceleration of the vehicle body. 
     According to the second aspect, the sensor storage part ( 71 ) includes a container ( 71   b ) storing the sensor ( 90 ) and a lid ( 71   a ) that covers the container ( 71   b ) from the above, the lid ( 71   a ) is located at a front end of the upper case ( 70 ), and the container ( 71   b ) is located at a front end of the lower case ( 80 ). With this configuration, attaching the upper case to the upper part of the lower case closes the upper part of the container with the lid. This configuration protects the sensor from water, dust and the like with the lid of the container and without additional components, and also facilitates the assembly job of the case member. 
     According to the third aspect, a rear cushion ( 34 ) is disposed forward and downward of the sensor storage part ( 71 ), and the rear cushion ( 34 ) absorbs vibrations of a swing arm ( 24 ) that rotatably supports the rear wheel (WR). The rear cushion positioned forward and downward of the sensor storage unit protects the sensor storage unit from water, stones and the like flying from the forward and downward during travelling. 
     According to the fourth aspect, a fuel tank ( 2 ) is disposed above the sensor storage part ( 71 ). Such a fuel tank protects the sensor storage unit from water, stones and the like flying from upward of the vehicle body. 
     According to the fifth aspect, attachment of the upper case ( 70 ) and the lower case ( 80 ) define a side opening ( 58 ) between the upper case ( 70 ) and the lower case ( 80 ). Through such a side opening defined between the upper case and the lower case, tubular members, such as hydraulic piping and power harnesses, connecting to the drive unit including the ABS modulator are easily guided. This side opening also dissipates heat generated at the drive unit. 
     According to the sixth aspect, the control device ( 92 ,  94 ) includes a first control device ( 92 ) stored in a storage recess ( 70   a ) of the upper case ( 70 ), and a second control device ( 94 ) that is positioned above and adjacent to the first control device ( 92 ). Vertically overlapping of the two control devices reduces the height of the case member. 
     According to the seventh aspect, the upper case ( 70 ) is integral with a first lock plate ( 74 ) and a second lock plate ( 73 ) that are positioned at a rear end of the upper case ( 70 ), the first lock plate ( 74 ) and the second lock plate ( 73 ) being turnable around the rear end of the upper case ( 70 ), the first lock plate ( 74 ) turns forward to press an upper face of the first control device ( 92 ) stored in the storage recess ( 70   a ), the second control device ( 94 ) is positioned above and adjacent to the first control device ( 92 ) having the first lock plate ( 74 ) between the first and second control devices ( 92 ,  94 ), the second lock plate ( 73 ) turns forward to press an upper face of the second control device ( 94 ), and the first lock plate ( 74 ) and the second lock plate ( 73 ) have forward ends that engage with an upper face of the upper case ( 70 ). These first lock plate and second lock plate stably hold the first control device and the second control device. The first lock plate sandwiched between the first control device and the second control device keeps the minimum distance between these control devices while isolating the control devices from vibrations and enabling the heat dissipation. These first lock plate and second lock plate are integral with the upper case, and this reduces the number of components of the upper case. 
     According to the eighth aspect, the case member ( 60 ) has a bottom face, and a regulator ( 53 ) is attached to the bottom face. This configuration places the regulator at a position with good heat-dissipation efficiency, and eliminates a dedicated stay for the regulator and so reduces the number of components. 
     According to the ninth aspect, the case member ( 60 ) has, at its rear end, a cylindrical recess ( 70   b ) to position a cylindrical canister ( 51 ) in proximity to the case member ( 60 ). This reduces the gap between the case member and the canister, and so reduces a redundant space. 
     According to the tenth aspect, a rear fender ( 42 ) is attached to a lower part of the rear end of the case member ( 60 ), and the rear fender ( 42 ) covers the rear wheel (WR) from the front and the above. This eliminates a dedicated stay for attachment of the rear fender to the vehicle body and so reduces the number of components. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a left side view of a motorcycle including an electrical component mounting structure according to one embodiment of the present invention. 
         FIG. 2  is a partially enlarged left side view of  FIG. 1 . 
         FIG. 3  is a left side view of  FIG. 2  without the rear cowl. 
         FIG. 4  is a cross-sectional view of the configuration of the case member and the peripherals. 
         FIG. 5  is a left side view of the case member with a rear fender attached thereto. 
         FIG. 6  is a perspective view of the case member viewed from the right front and above. 
         FIG. 7  is a front view of the case member. 
         FIG. 8  is a perspective view of the case member without a first control device and a second control device viewed from the left front and above. 
         FIG. 9  is a perspective view of the case member viewed from the left rear and above. 
         FIG. 10  is a perspective view of the case member viewed from the right front and above. 
         FIG. 11  is a perspective view of the upper case storing the first control device and the second control device viewed from the left front and above. 
         FIG. 12  is a perspective view of the upper case after the second lock plate in  FIG. 11  is unfolded. 
         FIG. 13  is a perspective view of the upper case after the second control device in  FIG. 12  is removed. 
         FIG. 14  is a perspective view of the upper case after the first lock plate in  FIG. 13  is unfolded. 
     
    
    
     DETAILED DESCRIPTION 
     The following describes a preferred embodiment of the present invention in details with reference to the drawings.  FIG. 1  is a left side view of a motorcycle  1  including an electrical component mounting structure according to one embodiment of the present invention. The motorcycle  1  is a dual-purpose type saddled vehicle configured to transmit the driving force for travelling from a power unit P having an integral structure of a four-stroke engine and a transmission to a rear wheel WR via a drive chain  23 . The vehicle body frame F of the motorcycle  1  includes a pair of left and right main frames F 2 , and a head pipe F 1  at the front end of the main frames F 2 . The head pipe F 1  pivotably supports a not-illustrated a steering stem. A pair of left and right front forks  13  supports a front wheel WF rotatably, and a top bridge  9  and a bottom bridge  12  fixed to the steering stem at an upper part and a lower part of the head pipe F 1  support the front forks  13 . The motorcycle includes a steering handle  3  fixed at the top bridge  9 , and a pair of left and right rear view mirrors  4  and a knuckle guard  5  are attached to the steering handle  3 . 
     The steering handle  3  is covered with a front cowl  7  at the front, and the front cowl  7  supports a head light  10  and a screen  6 . The motorcycle  1  has a pair of left and right front winker units  8  between the front cowl  7  and the steering handle  3 . A corning light  11  is disposed below the head light  10 , and turns on during cornering of the motorcycle  1  so as to illuminate the turning direction depending on the lean angle. A front fender  14  is fixed to the front forks  13  to cover the upper part of the front wheel WF. 
     A power unit P is disposed under the main frame F 2 , and an undercover  16  is disposed under the power unit P to protect the front part and the lower part of a crankcase  17  and an exhaust pipe  15 . Combustion gas at the power unit P flows through the exhaust pipe  15  and is emitted from a muffler  26  on the right in the vehicle width direction. 
     The main frames F 2  join to a pair of left and right pivot frames F 3  at the lower rear end, and each of the pivot frames F 3  extends downward and supports a pivot  18  of a swing arm  24  that rotatably supports the rear wheel WR. The pivot  18  swingably supports the front end of the swing arm  24 . The swing arm  24  is positioned rearward of the pivot  18  and suspends from the pivot frames F 3  via a rear cushion  34  that absorbs vibrations of the swing arm  24 . A pair of left and right footrest steps  19  is attached to a lower end of the pivot frames F 3 . A side stand  20  is pivotably supported rearward of the left footrest step  19  on the left in the vehicle width direction. A chain cover  25  is attached above the swing arm  24 , and the chain cover  25  covers the upper part of the drive chain  23 . A cover  35  of an electrical-component box  36  to store electrical components, such as an in-vehicle battery, is disposed forward of the pivot frames F 3  and between the main frames F 2  and the power unit P. 
     A fuel tank  2  is disposed above the main frames F 2 , and the rear part of the main frames F 2  join to a seat frame SF. The seat frame SF extends rearward and upward along the vehicle body. A pair of left and right pillion step holders  21  is attached to a lower part of the seat frame SF, and the pillion step holders  21  support pillion steps  22 . 
     The seat frame SF supports a front seat  33  and a rear seat  32  rearward of the fuel tank  2 . A rear cowl  31  covers the seat frame SF from the outside in the vehicle width direction, and the seat frame SF supports a rear carrier  30  on the outside of the rear seat  32  in the vehicle width direction. A tail light unit  29  and a rear fender  27  are disposed rearward of the rear cowl  31 , and a pair of left and right rear winker units  28  is disposed at the base of the rear fender  27 . 
       FIG. 2  is a partially enlarged left side view of  FIG. 1 . This drawing shows the motorcycle  1  shown in  FIG. 1  without some components, such as the power unit P and the swing arm  24 . An electrical component mounting structure of the present invention mainly includes a case member  60  to displace a plurality of electrical components. The case member  60  is disposed in a space defined with the fuel tank  2  having the rear end extending rearward and downward of the vehicle body, the seat  33  located rearward of the fuel tank  2 , the rear cushion  34  inclined forward relative to the vertical direction, and the circumference of the rear wheel WR in the side view of the vehicle body. The case member  60  is located substantially at the center in the vehicle width direction and fits in a space rearward and upward of the pivot frames F 3  and between the pair of left and right seat frames SF. 
     The cover  35 , which is on the left in the vehicle width direction and below the main frames F 2 , covers the electrical-component box  36  to store the in-vehicle battery and the like from the left in the vehicle width direction. A plate-like ECU  37  having a thickness is disposed above the cover  35  and inside of the main frames F 2 . In this way the dead space is utilized to dispose the ECU  37 , and the electrical-component box  36  below the ECU  37  protects the ECU  37  from heat generated at the power unit P. 
     A mount member  39  is fixed between the pair of left and right pivot frames F 3 . The mount member  39  has a through hole  38  that supports the upper end of the rear cushion  34 . A support shaft  41  for the footrest steps  19  and the side stand  20  is attached to the lower end of the pivot frame F 3 . The lower part of the fuel tank  2  has the rear end extending above the case member  60 , and the rear cowl  31  covers most of the lateral part of the case member  60 . 
     A grip member  43  is disposed rearward of the pillion step holder  21  supporting the pillion step  22 . The grip member  43  supports the vehicle body when the centerstand is extended. A reservoir tank  40  is disposed forward of the case member  60 . The reservoir tank  40  stores brake fluid to be added in a master cylinder of the rear brake. A rear fender  42  is disposed forward of the rear wheel WR to block mud, for example, that is whirled up by the rear wheel WR. 
       FIG. 3  is a left side view of  FIG. 2  without the rear cowl  31 . The case member  60  stores an ABS modulator  50  at a lower part, and this ABS modulator  50  operates as a drive unit to control the brake-fluid pressure. A cylindrical canister  51  is positioned in proximity to and rearward of the case member  60 . In one example, the canister  51  may be a charcoal canister to adsorb vaporized fuel generated inside of the fuel tank  2 . 
     A stay  36   a  supporting the electrical-component box  36  is disposed forward of the pivot frame F 3 . The mount member  39 , which supports the upper end of the rear cushion  34 , is at a visible position through an opening  44  of the pivot frame F 3 . Each of the seat frames SF on the left and right of the case member  60  in the vehicle width direction includes an upper pipe  45  and a lower pipe  47  connected with a cross pipe  46  and a reinforcing plate  48 , and the front ends of the upper pipe  45  and the lower pipe  47  are fixed to the rear part of the pivot frame F 3 . A plate-like cross member  49  extends between the upper faces of the left and right upper pipes  45  to support the fuel tank  2  and the seat  33 . 
     With this configuration, the upper part of the case member  60  (dot hatching part) is protected by the fuel tank  2  and the cross member  49 , the lateral parts of the case member  60  are protected by the seat frames SF, the front part of the case member  60  is protected by the rear cushion  34  and the pivot frames F 3 , and the rear part of the case member  60  is protected by the rear fender  42 . In this way, this configuration protects the surrounding of the case member  60  from flying stones during travelling, accesses by third party and the like. 
       FIG. 4  is a cross-sectional view of the configuration of the case member  60  and the peripherals. The case member  60  is made of a hard resin, for example, and includes an lower case  80  storing the ABS modulator  50  and an upper case  70  attached above the lower case  80 . The lower case  80  has a bottom face, to which a regulator  53  having a connector  54  attached to the rear end is attached. This configuration enables effective cooling of the regulator  53  that is a device generating heat. The lower case  80  has a wide curved plate  81  at the rear end, and this curved plate  81  has a shape engaging with an engagement pipe  55  at the rear fender  42  from the above. A supporting plate  56  extends from the rear fender  42 , and this supporting plate  56  supports the engagement pipe  55  from the below. 
     The electrical component mounting structure of the present invention includes the case member  60  having the lower case  80  storing the ABS modulator  50  and the upper case  70  joining to the lower case  80  and covering the lower case  80  from the above. This case member  60  has a sensor storage part  71  to store a gyroscope sensor  90  at the front end, and a first control device  92  and a second control device  94  are attached to the upper case  70 . In this way, the gyroscope sensor  90  and the two control devices are placed in the case member  60  storing the ABS modulator  50 . This enables concentration of a plurality of electrical components and so mass concentration, and eliminates a dedicated stay for attachment of the gyroscope sensor  90  and the control devices to the vehicle body and so reduces the number of components. The sensor storage part  71  located at the front end of the case member  60  protects the gyroscope sensor  90  from heat generated at the power unit P, the flying stones and the like, and places the gyroscope sensor  90  at a position close to the vehicle-body center that is suitable for the measurement of the angular velocity of the vehicle body. 
     The case member  60  has the box-like sensor storage part  71  at the front end of the upper part to store the gyroscope sensor  90  with a connector  91 . The rear end of the fuel tank  2  extends rearward beyond this sensor storage part  71 . 
     The mount member  39 , which supports the upper end of the rear cushion  34 , is fixed to a cross pipe  52  joining the left and right pivot frames F 3  in the vehicle width direction. The sensor storage part  71  is placed close to the mount member  39  and the upper end of the rear cushion  34 . In this way the sensor storage part  71  is placed close to the center of the vehicle body, and this allows the gyroscope sensor  90  to be placed at a position suitable for the measurement of the angular velocity generated at the vehicle body. 
     The upper case  70  is located rearward of the sensor storage part  71 , and the first control device  92  as a DCU (drive control unit) and the second control device  94  as a BMU (battery management unit) are stacked in vertically two-tiered manner in the upper case  70 . Specifically the second control device  94  having a connector  95  is positioned above and in proximity to the first control device  92  having a connector  93  and close to the rear end of the first control device  92 . A connector  59  of another electrical component is then placed above the second control device  94 . 
     The upper case  70  and the lower case  80  define a side opening  58  therebetween, through which tubular members  57 , such as a brake duct and a harness, connecting to the ABS modulator  50  pass. The upper case  70  has a cylindrical recess  70   b  at the rear end to position the cylindrical charcoal canister  51  in proximity to the upper case  70 . 
       FIG. 5  is a left side view of the case member  60  with the rear fender  42  attached thereto.  FIG. 6  is a perspective view of the case member  60  viewed from the right front and above, and  FIG. 7  is a front view of the case member  60 . 
     As described above, the case member  60  includes the lower case  80  storing the ABS modulator  50  and the upper case  70  attached above the lower case  80 , the upper case  70  storing the first control device  92  and the second control device  94 .  FIG. 5  to  FIG. 7  show the brake duct  57   a  passing through the side opening  58  defined between the upper case  70  and the lower case  80 . A vent hose  51   a  connects to a lower end of the charcoal canister  51  on the left, and a guide hole  80   b  of the lower case  80  guides this vent hose  51   a  along a route leading to the front lower part of the vehicle body. The rear fender  42  made of a hard resin, for example, includes a box part  42   a  fixed to the lower case  80  and a plate-like mudguard  42   b  extending downward from the rear end of the box part  42   a.    
     Referring to  FIG. 6 , the rear fender  42  is fixed to the lower case  80  via a fixing member  82  (the gray part in the drawing). A vaporized-fuel pipe  51   b  connecting to the fuel tank  2  is attached to the right side of the charcoal canister  51 , and this vaporized-fuel pipe  51   b  is routed toward the front of the vehicle body along the right side of the upper case  70 . The upper case  70  has a pair of left and right stay members  72  that is fixed to the upper faces of the upper pipes  45  (see  FIG. 3 ) of the seat frames SF, and these stay members  72  are to hang the case member  60 . 
     Referring to  FIG. 7 , a part of the lower case  80  that stores the ABS modulator  50  is placed on the left of the vehicle body. The sensor storage part  71  at the front end of the case member  60  includes a container  71   b  to store the gyroscope sensor  90  and a lid  71   a  that covers the container  71   b  from the above. The container  71   b  is integral with a front end part of the lower case  80 , and the lid  71   a  is integral with a front end part of the upper case  70 . 
       FIG. 8  is a perspective view of the case member  60  without the first control device  92  and the second control device  94  viewed from the left front and above of the vehicle body.  FIG. 9  is a perspective view of the case member  60  viewed from the left rear and above of the vehicle body, and  FIG. 10  is a perspective view of the case member  60  viewed from the right front and above of the vehicle body. 
     The lower case  80  includes an open-topped container to store the ABS modulator  50 , and the container  71   b  of the sensor storage part  71  that is integral with the front end part of the container. The upper case  70  includes a container having a storage recess  70   a  to store the second control device  94 , and the lid  71   a  of the sensor storage part  71  that is integral with the front end part of the container. Attaching the upper case  70  to the upper part of the lower case  80  closes the opening of the container  71   b  with the lid. Such a sensor storage part  71  with lid effectively protects the gyroscope sensor  90  from water, dust, heat from the power unit P, and the like. 
     A first lock plate  74  (hatching part with dense dots) and a second lock plate  73  (hatching part with sparse dots) are disposed at the rear end part of the upper case  70 . These first lock plate  74  and second lock plate  73  are turnable around the rear end of the upper case  70 . As shown in the drawing, these first lock plate  74  and second lock plate  73  have a function of turning (or being folded) forward so as to press the upper faces of the first control device  92  and the second control device  94 . 
     Referring to  FIG. 9 , the lid  71   a  of the sensor storage part  71  has an opening  71   c  in the rear face, through which the connector  91  of the gyroscope sensor  90  passes. The storage part  80   a  to store the ABS modulator  50  is placed on the left of the lower case  80 , and a left wall of the storage part is low to facilitate the connection of the duct to the ABS modulator  50  or the maintenance and to enhance the cooling effect of the ABS modulator  50 . The cylindrical recess  70   b  at the rear face of the upper case  70  allows the cylindrical charcoal canister  51  to be positioned in proximity to the upper case  70 , and so removes dead space to make the surroundings of the case member  60  compact. 
     Referring to  FIG. 10 , the lower case  80  has the storage part  80   a  for the ABS modulator  50  on the left in the vehicle width direction, and this keeps a space on the right to place the fixing member  82  (see  FIG. 6 ) supporting the rear fender  42 . The side opening  58  between the upper case  70  and the lower case  80  is defined between a support pillar  83  close to the rear end of the lower case  80  and on the right of the vehicle body and a standing part of the container  71   b  close to the front end. 
       FIG. 11  is a perspective view of the upper case  70  storing the first control device  92  and the second control device  94  viewed from the left front and above of the vehicle body. The first control device  92  (gray part in the drawing) is stored at the bottom close to the front of the storage recess  70   a  of the upper case  70 . The first lock plate  74  turning forward comes in contact with the upper face of the first control device  92 , and the second control device  94  is disposed on the first lock plate  74 . Then the second lock plate  73  having a step-like shape covers the upper face of the second control device  94 . This keeps the first control device  92  and the second control device  94  in place. Such vertically proximally positioning of the first control device  92  and the second control device  94  reduces the height of the upper case  70 , and so makes the case member  60  compact. 
     The first lock plate  74  has an engagement plate  74   a  engaging with an engagement slit in the second lock plate  73 , and a positioning plate  74   b  to abut on the front end face of the second control device  94 . Hook members  75  of the upper case  70  hold the front end of the second lock plate  73  on the upper face of the upper case  70 . 
       FIG. 12  is a perspective view of the upper case  70  after the second lock plate  73  of  FIG. 11  is unfolded. The second lock plate  73  has a pair of left and right engagement holes  73   b  engaging with the hook members  75  of the upper case  70 , and an engagement slit  73   a  located between these engagement holes  73   b . Releasing of the engagement of the engagement holes  73   b  with the hook members  75  and the engagement of the positioning plate  74   b  with the engagement slit  73   a  and expanding (unfolding) the second lock plate  73  rearward makes the second control device  94  removable. 
       FIG. 13  is a perspective view of the upper case  70  after the second control device  94  of  FIG. 12  is removed.  FIG. 14  is a perspective view of the upper case  70  after the first lock plate  74  of  FIG. 13  is unfolded. The first lock plate  74  at the center of the upper case  70  is narrow, and has a shape fitting in the second lock plate  73  having a substantially U-letter shape. The first lock plate  74  has a downward protrusion  74   c  that abuts on the rear end face of the first control device  92  when the first lock plate  74  is folded forward and so has a positioning function of the first control device  92 . Unfolding of this first lock plate  74  rearward makes the first control device  92  removable. 
     As described above, the upper case  70  is integral with the first lock plate  74  and the second lock plate  73  that are turnable around the rear end of the upper case  70 . The first lock plate  74  is folded (turns) forward of the vehicle body so as to press the upper face of the first control device  92  stored in the storage recess  70   a . The second control device  94  is positioned above and adjacent to the first control device  92  while having the first lock plate  74  between these control devices, and the second lock plate  73  is folded (turns) forward of the vehicle body so as to press the upper face of the second control device  94 . The forward ends of the first lock plate  74  and the second lock plate  73  engage with the upper face of the upper case  70 . These first lock plate  74  and second lock plate  73  stably hold the first control device  92  and the second control device  94 . The first lock plate  74  sandwiched between the first control device  92  and the second control device  94  keeps the minimum distance between these control devices while isolating the control devices from vibrations and enabling the heat dissipation. These first lock plate  74  and second lock plate  73  are integral with the upper case  70 , and this reduces the number of components of the upper case  70 . 
     Various modifications are possible to the above embodiment, including the form of the motorcycle, the shapes and the types of the first control device and the second control device, the shape and the structure of the ABS modulator, the shape and the structure of the case member, the shapes and the structures of the upper case and the lower case, the shapes and the structures of the sensor storage part and the lock plates, and the joining structure of the upper case and the lower case. The sensor stored in the sensor storage part is not limited to a gyroscope sensor, which may be an acceleration sensor or a tilt sensor. The electrical component stored in the lower case is not limited to the ABS modulator, which may be an ECU or a traction control unit, for example. The electrical component mounting structure of the present invention is applicable to vehicles other than motorcycles, such as a three-wheeled or four-wheeled saddled vehicle. 
     REFERENCE SIGNS LIST 
       1  . . . Saddled vehicle,  2  . . . Fuel tank,  24  . . . Swing arm,  33  . . . Seat,  34  . . . Rear cushion,  42  . . . Rear fender,  50  . . . ABS modulator (drive unit),  51  . . . Canister,  53  . . . Regulator,  58  . . . Side opening,  60  . . . Case member,  70  . . . Upper case,  70   a  . . . Storage recess,  70   b  . . . Cylindrical recess,  71  . . . Sensor storage part,  71   b  . . . Container,  71   a  . . . Lid,  73  . . . Second lock plate,  74  . . . First lock plate,  80  . . . Lower case,  90  . . . Sensor,  92  . . . First control device (control device),  94  . . . Second control device (control device), P . . . Power unit, F . . . Vehicle body frame, WR . . . Rear wheel