Patent Publication Number: US-2021188384-A1

Title: Straddle vehicle

Description:
FIELD OF THE INVENTION 
     The present invention relates to a straddle vehicle including a radar device. 
     BACKGROUND 
     Japanese Patent Application Laid-Open No. 2019-048554 discloses a motorcycle including a radar device for detecting an area in front of the motorcycle. 
     The radar device of Japanese Patent Application Laid-Open No. 2019-048554 is attached on a bracket connected to a body frame of the motorcycle. The radar device is located at a relatively high position inside the front cowl (e.g., at the same height as the headlight). 
     SUMMARY 
     Japanese Patent Application Laid-Open No. 2019-048554 does not disclose a structure for attaching the radar device in a relatively low position inside the front cowl. When the radar device is attached at a relatively low position inside the front cowl, it is difficult to stabilize the posture of the radar device because the member connecting the radar device to the body frame may be long. 
     The present invention relates to a configuration for stabilizing posture of a radar device in a straddle vehicle in which the radar device is arranged in a relatively low position inside a front cowl. 
     An aspect of the present invention provides a straddle vehicle as follows. That is, the straddle vehicle includes a first frame, a hanging frame, a front cowl, and a radar device. The first frame is located in front of a head pipe and supported by the head pipe. The hanging frame is connected to the first frame. The hanging frame includes a plurality of extension portions extending downwardly from the first frame and an attachment portion connecting at least two of the plurality of extension portions to each other. The front cowl is located at the front part of the straddle vehicle and protrudes forward and forms a recess at the rear side of the straddle vehicle. 
     The radar device is supported by the attachment portion of the hanging frame and is arranged in the recess of the front cowl. 
     This allows the hanging frame to include at least two extension portions instead of one extension portion, thereby stabilizing the attachment portion that supports the radar device. As a result, the radar device can be located lower than the first frame, which is relatively low, and the posture of the radar device can be stabilized. In particular, the radar device is relatively heavy among electrical components, and the posture change is undesirable. Therefore, the effect of being able to stabilize the posture can be effectively utilized. 
     According to the present invention, the posture of the radar device can be stabilized in a straddle vehicle in which the radar device is arranged in a relatively low position inside the front cowl. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a side view of a motorcycle of an embodiment of the present invention. 
         FIG. 2  is a plan view of a front part of the motorcycle. 
         FIG. 3  is a perspective view of a support frame viewed from rear of the motorcycle. 
         FIG. 4  is a perspective view of a radar stay and a radar device viewed from front of the motorcycle. 
         FIG. 5  is a bottom view of the radar stay and the radar device. 
         FIG. 6  is a perspective view of the radar stay and the radar device viewed from rear of the motorcycle. 
     
    
    
     DETAILED DESCRIPTION 
     Next, embodiments of the present invention will be described with reference to the drawings. In the following explanation, the left-right direction of the motorcycle (straddle vehicle)  1  is defined based on the view from a driver (rider) riding on the motorcycle  1 . Therefore, the front-rear direction coincides with a vehicle length direction and the left-right direction coincides with a vehicle width direction. The up-down direction (vertical direction) coincides with a height direction. 
     First, an outline of the motorcycle  1  of this embodiment will be described with reference to  FIG. 1  and  FIG. 2 .  FIG. 1  is a side view of the motorcycle  1 .  FIG. 2  is a plan view of a front part of the motorcycle  1 . 
     As shown in  FIG. 1 , a motorcycle  1  is provided with a vehicle body  10 . The vehicle body  10  includes a plurality of body frames as a framework of the motorcycle  1 . The motorcycle  1  is provided with a head pipe  11  and a main frame  12  as the body frame. The configuration of the body frames is an example, and may be different. 
     The head pipe  11  has a shaft insertion hole for inserting a steering shaft (not shown). An upper bracket  13  is located above the head pipe  11 . A lower bracket  14  is located below the head pipe  11 . The upper bracket  13  and the lower bracket  14  have fork insertion holes for inserting the left and right front forks  15 , respectively. A front wheel  16  is rotatably attached to the lower part of the front fork  15 . A front tire  17  is attached on the front wheel  16 . The upper side of the front tire  17  is covered by the front fender  18 . 
     The main frame  12  is connected to the head pipe  11 . The main frame  12  is arranged to extend rearward from the head pipe  11 . An engine  21  is attached to the main frame  12  directly or via another member. A swing arm  22  is attached to the rear part of the main frame  12 . A rear wheel  25  is rotatably attached to the rear part of the swing arm  22 . A rear tire  26  is attached to the rear wheel  25 . 
     The engine  21  generates power, and the power is transmitted to the rear wheel  25  via the drive chain (not shown). This allows the motorcycle  1  to be driven. The engine  21  in this embodiment is a gasoline engine. In place of or in addition to the gasoline engine, another drive source, such as an electric motor for driving, may be provided. 
     A handlebar-type steering handle  28  is arranged near the upper end of the front fork  15 . By turning the steering handle  28  by the driver, the front forks  15  are turned so that the motorcycle  1  can be turned and the direction of travel can be changed. The motorcycle  1  is a lean type vehicle that is a vehicle in which the vehicle body  10  is inclined relative to a road surface toward a center of the turn when turning. 
     A fuel tank  29  is arranged behind the steering handle  28  and above the engine  21 , and the fuel tank  29  stores fuel for supplying the engine  21 . A seat  30  for the driver to be seated is arranged behind the fuel tank  29 . A step (not shown) is arranged on the left side and the right side of the vehicle body  10 , respectively. The driver straddles the seat  30  and places his feet on the left step and right step. Thus, since the driver is seated astride the seat  30 , the motorcycle  1  is a straddle vehicle. 
     A windscreen  31  is arranged in front of the steering handle  28 . The windscreen  31  is arranged to extend backwardly and upwardly from the lower end (base). With this configuration, the windscreen  31  guides the driving wind to make the driving wind less likely to hit the driver. The windscreen  31  is transparent or translucent, and the windscreen  31  can transmit visible light in order to ensure the driver&#39;s vision. 
     A camera  35  is located at the rear of the windscreen  31 . The camera  35  is located so as to overlap with the center of the vehicle width direction. The camera  35  photographs an area in front of the motorcycle  1  through the windscreen  31 . The image generated by the camera  35  is output to the control unit (not shown). The control unit performs vehicle control based on the received image. For example, the control unit detects a foregoing vehicle, an oncoming vehicle, an obstacle, a pedestrian, or the like. In accordance with the detection result, the control unit controls to change the irradiation direction or irradiation position of the headlight  32  or to perform the brake to assist in preventing collision with obstacles or pedestrians. 
     A headlight  32  is arranged in the front of the vehicle body  10  to irradiate the front of the vehicle. The light source of the headlight  32  is, for example, an incandescent bulb, a halogen bulb, a high-intensity-discharge (HID) lamp, or a light-emitting diode (LED). The headlight  32  of this embodiment is arranged so that the headlight  32  overlaps with the center of the vehicle width direction. The “overlap with the center of the vehicle width direction” means, for example, that the virtual line passing through the center of the motorcycle  1  in the vehicle width direction in plan view overlaps with the headlight  32 . The headlights  32  may be provided in pairs, for example, a pair of right and left headlights. 
     A cowl is arranged on the outer surface of the motorcycle  1 . The cowl is made of resin and is made of a material that can transmit electromagnetic wave of frequency used in radar or the like. The cowl is provided for the purpose of reducing the aerodynamic drag of the motorcycle  1 , protecting the various parts of the motorcycle  1 , and improving the appearance of the motorcycle. 
     In this specification, the cowl arranged primarily at the front part of the motorcycle  1  is referred to as the front cowl  33 . The front part of the motorcycle  1  is the part of the motorcycle  1  that is forward of the center in the vehicle length direction of the motorcycle  1 , for example, the part that is forward of the seat  30 . The front cowl  33  is shaped to protrude forward. Therefore, a recess is formed behind the front cowl  33  or in the front cowl  33 , and a space is formed by this recess in the front cowl  33 . The outline of the front cowl  33  includes portions that decrease in size in the vehicle width direction and in the height direction as they approach the front. As a result, the space in the front cowl  33  also includes portions that decrease in size in the vehicle width direction and height direction as they approach the front. In the front cowl  33 , a headlight  32  or the like is arranged. 
     Next, a radar device  60  included in the motorcycle  1  will be described. A radar device transmits electromagnetic waves (such as infrared rays, millimeter waves, or microwaves) forward and receives the reflected waves (electromagnetic waves) reflected by the target. The radar device detects the direction in which the target exists and the distance to the target. Therefore, it is preferable that no object that does not transmit electromagnetic waves is placed in front of the radar device  60 . In this respect, the cowl of this embodiment is made of a material that is capable of transmitting electromagnetic waves, so it does not interfere with the transmission and reception of electromagnetic waves. The detection results of the radar device  60  are output to the control unit described above. Based on the presence or absence of a target in front of the vehicle and the distance to the target, the control unit notifies the driver of information about the target and performs the brakes to assist in preventing a collision with the object. 
     Next, a frame structure for supporting the radar device  60  will be described with reference to  FIG. 3  and  FIG. 4 . As shown in  FIG. 3 , the head pipe  11  has a cylindrical portion  11   a  in which a shaft insertion hole is formed, and an attachment base  11   b  extending forward from the cylindrical portion  11   a . The cylindrical portion  11   a  and the attachment base  11   b  are connected by welding, for example. 
     A support frame  40  is attached to the attachment base  11   b . The support frame  40  is connected to the head pipe  11  and is located forward of the head pipe  11 . The support frame  40  is a frame for supporting a plurality of electrical components including the radar device  60 . The support frame  40  has a connection frame  41 , a branch frame  42 , a plate-shaped frame  43 , a hanging frame  44 , and a front frame  45 . 
     The connection frame  41  is a frame for connecting with the attachment base  11   b . The connection frame  41  is configured to allow insertion of the attachment base  11   b . The connection frame  41  and the attachment base  11   b  are connected by using, for example, a fixture such as a bolt and nut which are not shown in figures. The connection frame  41  and the attachment base  11   b  may be connected by welding. 
     The branch frame  42  includes a branch point. The branch frame  42  has a junction portion  42   a  at the rear side from the branch point and a branch portion  42   b  at the front side from the branch point. The junction portion  42   a  is connected to the connection frame  41 . The branch portion  42   b  branches from the branch point so as to spread to one side and the other side in the vehicle width direction. 
     The plate-shaped frame  43  is a plate-shaped member having an abbreviated L-shape. The plate-shaped frame  43  has a first plate  43   a  and a second plate  43   b  comprising an L-shape, and a triangular-shaped third plate  43   c  connecting the first plate  43   a  and the second plate  43   b . The first plate  43   a  is connected to the connection frame  41  and the branch portion  42   b . A plurality of stays (not shown) for attaching electrical components or the like are connected to the front side surface of the first plate  43   a . As shown in  FIG. 4 , the spaces located at the front side of the first plate  43   a  are referred to as a first space  91  and a second space  92  in order from the upper side. One or more electrical components are arranged in the first space  91  and the second space  92 , respectively. For example, the headlight  32 , the engine control unit, and the relay box are located in either the first space  91  or the second space  92 . The second plate  43   b  is connected to the hanging frame  44 . A leg part  43   d  is connected to the second plate  43   b . The leg part  43   d  is connected to the lower wall  33   a  of the space within the front cowl  33 . In other words, the hanging frame  44  is connected to the lower wall  33   a  via the second plate  43   b  and the leg part  43   d . This allows the posture of the plate-shaped frame  43  to be stabilized. The second plate  43   b  and the leg part  43   d  together may be referred to as the connection member  430 . 
     The plate-shaped frame  43  may be other shape other than the plate shape. In other words, it is sufficient to have a first portion of any shape that is connected to the connection frame  41  and the branch frame  42  and extends vertically, and a second portion of any shape that is connected to the lower wall  33   a  via the leg part  43   d  and extends horizontally. If these first and second portions are sufficiently rigid, the third portion (corresponding to the third plate  43   c ) connecting the first and second portions can be omitted. 
     The hanging frame  44  is an abbreviated U-shaped pipe-like member. The hanging frame  44  is composed of a single pipe member which is bent. In the following, the hanging frame  44  is described by dividing two extension portions  44   a  and an attachment portion  44   b . The extension portion  44   a  is shaped to extend downwardly (in detail, obliquely downwardly in front). In other words, the longitudinal direction of the extension portion  44   a  coincides with the up-down direction (diagonally downward in front). The upper end of the left side extension portion  44   a  is connected to the left side branch portion  42   b . The upper end of the right side extension portion  44   a  is connected to the right side branch portion  42   b . The extension portion  44   a  is connected to the third plate  43   c . The lower ends of the left and right extension portions  44   a  are connected to each other at the attachment portion  44   b . The attachment portion  44   b  is shaped to extend in the vehicle width direction. 
     In this embodiment, the hanging frame  44  is made by bending a single pipe. The hanging frame  44  may be manufactured by connecting a plurality of members by welding or fixture. In this embodiment, there are two extension portions  44   a . There may be three or more extension portions  44   a . In this embodiment, an attachment portion  44   b  is connected to the lower end of the extension portion  44   a . The attachment portion  44   b  may be connected to the middle portion of the extension portion  44   a.    
     The front frame  45  extends in the vehicle width direction. The front frame  45  connects the left and right branch portions  42   b . Specifically, the left end of the front frame  45  is connected to the left branch portion  42   b , and the right end of the front frame  45  is connected to the right branch portion  42   b.    
     The support frame  40  includes a meter stay  51 , a mirror stay  52 , and a camera stay  53 . The meter stay  51  is a member for attaching the meter device  34  and is connected near the branch point of the branch frame  42 . The meter device  34  is a display device that shows a vehicle speed and an engine speed, etc. The meter device  34  is attached by the meter stay  51  and other stays. The mirror stay  52  is a member for attaching the left and right side mirrors and is connected to both the branch portion  42   b  and the front frame  45 . The radar stay  70  is a member for attaching the radar device  60  and is connected to the attachment portion  44   b  of the hanging frame  44 . In addition to the radar stay  70 , the hanging frame  44  may also have stays for attaching other electrical components or the like. 
     Next, with reference to  FIG. 4  to  FIG. 6 , the configuration of the radar device  60  will be described. As shown in  FIG. 4  to  FIG. 6 , the radar device  60  has a main body  61 , an orientation (aiming) adjustment mechanism  62 , and a connector  63 . 
     The main body  61  includes a rectangular shape (a rectangular parallelepiped shape, a cuboid shape) case. In this specification, a rectangular shape includes a substantially rectangular shape. Thus, for example, even if at least one of the six surfaces includes a curved surface or a step, the main body  61  corresponds to a “rectangular shape”. Even if at least one of the six surfaces is a shape other than a rectangle, the main body  61  corresponds to a “rectangular shape”. An antenna and circuits for transmitting and receiving electromagnetic waves are arranged into the rectangular-shaped case. Electromagnetic waves are transmitted and received from the front of the main body  61 . 
     The orientation adjustment mechanism  62  is a mechanism for adjusting the orientation of the radar device  60  (e.g., the first rotation angle with the up-down direction as the rotation center and the second rotation angle with the left-right direction as the rotation center). As shown in  FIG. 6 , the orientation adjustment mechanism  62  has three adjustment parts  62   a . By performing an operation (e.g., a rotation operation) to adjust these adjustment parts  62   a , the orientation of the radar device  60  can be adjusted. The adjustment parts  62   a  are arranged rearward from the main body  61 . Thus, the operator operates the adjustment parts  62   a  from the rear side of the radar device  60 . 
     The connector  63  is arranged on one side (left side or right side) of the main body  61  in the vehicle width direction. A power supply line to the main body  61  and a signal line for outputting the detection results of the main body  61  to the control unit described above are connected to the connector  63 . The image data may be output wirelessly instead of wired. 
     Next, referring to  FIG. 4  to  FIG. 6 , the attachment structure of the radar device  60  will be described. A radar bracket  80  is attached to the radar stay  70  described above, and the radar device  60  is attached to the radar bracket  80 . This allows the radar device  60  to be attached at a position lower than the first space  91  and the second space  92 . 
     The radar stay  70  includes a first attachment portion  71 , a second attachment portion  72 , and a frame connection portion  73 . 
     The first attachment portion  71  is a plate-shaped portion having a surface perpendicular to the up-down direction (which is a first attachment surface). An attachment hole (not shown) is formed in the first attachment portion  71  for attaching the radar bracket  80 . 
     The second attachment portion  72  is a plate-shaped portion having a surface perpendicular to the front-rear direction (which is a second attachment surface). An angle between the first attachment portion  71  and the second attachment portion  72  is 90 degrees. The angle between the first attachment portion  71  and the second attachment portion  72  may be any other angle. As shown in  FIG. 6 , an opening portion  72   a  is formed in the second attachment portion  72  to enable the adjustment part  62   a  to be operated. The opening portion  72   a  is a through hole or a notch. In addition, an attachment hole is formed in the second attachment portion  72  for attaching the radar bracket  80 . 
     The frame connection portion  73  is a portion connected to the attachment portion  44   b . The frame connection portion  73  is welded to the front surface of the attachment portion  44   b  and is provided so as to protrude forward from the attachment portion  44   b . This makes it possible to position the radar device  60  more forward. The frame connection portion  73  is not in contact with the lower wall  33   a.    
     The radar bracket  80  is an L-shaped plate-like member provided with a first attachment portion  81  and a second attachment portion  82 . 
     The first attachment portion  81  is a plate-shaped portion having a surface perpendicular to the up-down direction. After the first attachment portion  81  is placed on the upper surface (first attachment surface) of the first attachment portion  71 , the first attachment portion  81  is attached to the first attachment portion  71  using the fixture  101 , as shown in  FIG. 6 . A vibration reduction member (first vibration reduction member)  102  is sandwiched between the fixture  101  and the first attachment portion  81 . This allows the radar device  60  to be supported so that the vibration of the radar device  60  reduces. 
     By not attaching the radar device  60  directly on the radar stay  70  but through the radar bracket  80 , the weight of the radar device  60  can be supported on a surface perpendicular to the vertical direction (the upper surface of the first attachment portion  71 ). This makes it possible to stabilize the posture of the radar device  60 . 
     The second attachment portion  82  is a plate-like portion having a surface perpendicular to the front-rear direction. The angle between the first attachment portion  81  and the second attachment portion  82  is 90 degrees. The angle between the first attachment portion  81  and the second attachment portion  82  may be any other angle. As shown in  FIG. 5 , the second attachment portion  82  is attached to the front side of the second attachment portion  72  using a fixture  103 . A vibration reduction member (second vibration reduction member)  104  is sandwiched between the fixture  103  and the second attachment portion  82 . This allows the radar device  60  to be supported so that the vibration of the radar device  60  reduces. Since the adjustment part  62   a  is arranged in three of the four corners of the second attachment portion  82 , the fixture  103  and the vibration reduction member  104  are arranged in the other remaining corner. 
     The axial direction of the fixture  101  and the vibration reduction member  102  for attaching the first attachment portion  81  is up-down direction, and the axial direction of the fixture  103  and the vibration reduction member  104  for attaching the second attachment portion  82  is front-rear direction. The vibration reduction members  102 ,  104  can reduce vibration mainly in the axial direction. Accordingly, as in this embodiment, the different axial directions of the vibration reduction members  102 ,  104  can suppress the vibrations in various directions transmitted to the radar device  60 . 
     In the state in which the radar device  60  is attached to the radar stay  70  using the radar bracket  80 , the radar bracket  80  and the radar device  60  do not contact the lower wall  33   a . Therefore, the orientation of the radar device  60  can be adjusted downward. On the other hand, by supporting the radar device  60  or the like in this manner, the weight of the radar device  60 , the radar stay  70 , and the radar bracket  80  is supported by the hanging frame  44 . Therefore, there is a concern that the hanging frame  44  may be deformed or gyrated. However, in this embodiment, since the hanging frame  44  is supported by the lower wall  33   a  via the connection member  430  (the second plate  43   b  and the leg part  43   d ), deformation and gyrating of the hanging frame  44  can be prevented, and as a result, the posture of the radar device  60  can be stabilized. 
     If the radar stay  70  is configured so that the orientation of the radar stay  70  does not change when the orientation of the radar device  60  is adjusted, the lower end of the second attachment portion  72  of the radar stay  70  may be in contact with the lower wall  33   a . Accordingly, the posture of the radar device  60  can be stabilized. 
     Next, the layout of the radar device  60  will be described. 
     As shown in  FIG. 1  and  FIG. 2 , the radar device  60  of this embodiment is arranged so as to overlap with the center of the vehicle width direction of the motorcycle  1 . Further, the radar device  60  is arranged such that the radar device  60  overlaps the headlight  32  in plan view and is below the headlight  32 . The front cowl  33  of this embodiment has a shape in which the size in the vehicle width direction decreases as it approaches the front end. This may make it difficult to line up both the radar device  60  and the headlight  32 , which are preferably located at the front end, in the vehicle width direction. In this respect, by arranging the radar device  60  and the headlight  32  above and below as in this embodiment, both can be arranged at the front end of the front cowl  33 . 
     The detection range of the radar device  60  varies depending on a control, a spec, or a purpose. Since the radar device  60  basically detects obstacles on the road (obstacles in the sky need not be detected), for example, the detection range in the left-right direction may be wider than the detection range in the up-down direction. In this case, if the radar device  60  and the headlight  32  are arranged side by side in the vehicle width direction, the headlight  32  may interfere with the detection range of the radar device  60  if the headlight  32  is located only slightly in front of the radar device  60 . In this regard, by arranging the radar device  60  and the headlight  32  side by side in the up-down direction, a wide range in the left-right direction can be detected. 
     In this embodiment, in addition to the radar device  60  and the headlight  32 , a camera  35  is further arranged in an up-down direction. Specifically, as shown in  FIG. 1 , the camera  35 , the headlight  32 , and the radar device  60  are arranged in this order from the top. As shown in  FIG. 2 , the camera  35 , the headlight  32 , and the radar device  60  are located so as to overlap with the center of the vehicle width direction (of the motorcycle  1 ). Accordingly, in a front view, the camera  35 , the headlight  32 , and the radar device  60  overlap with a straight line passing through the center of the vehicle width direction. Instead of this layout, the camera  35 , the headlight  32 , and the radar device  60  may be configured to overlap with a single straight line that passes through other than the center of the vehicle width direction and the line is parallel to the up-down direction. 
     When the radar device  60  is placed relatively low, as in this embodiment, it must also be considered that the electromagnetic waves are not obstructed by the front tire  17  and the front fender  18 . In this regard, the radar device  60  (the center of the radar device  60  in the vehicle width direction and in the vehicle length direction) is located forward of the center of the front wheel  16 . In other words, since the radar device  60  is located past the peak height of the front tire  17  and front fender  18 , the electromagnetic waves are less likely to be impeded by them. 
     As described above, the motorcycle  1  includes the branch frame  42 , the hanging frame  44 , the front cowl  33 , and the radar device  60 . The branch frame  42  is supported by the head pipe  11  and is located in front of the head pipe  11 . The hanging frame  44  is connected to the branch frame  42  and includes a plurality of extension portions  44   a  extending downward from the branch frame  42  and the attachment portion  44   b  connecting at least two of the plurality of extension portions  44   a  to each other. The front cowl  33  is arranged at the front part of the motorcycle  1  and protrudes forward. The recess is formed rear side of the front cowl  33 . The radar device  60  is supported by the attachment portion  44   b  of the hanging frame  44  and arranged in the recess of the front cowl  33 . 
     This allows the hanging frame  44  to include at least two extension portions  44   a , thereby stabilizing the attachment portion  44   b  that supports the radar device  60 . As a result, the radar device  60  can be located lower than the first frame, which is relatively low, and the posture of the radar device  60  can be stabilized. In particular, the radar device  60  is relatively heavy among electrical components, and the posture change is undesirable. Therefore, the effect of being able to stabilize the posture can be effectively utilized. 
     The motorcycle  1  of this embodiment includes the connection member  430  that connects the lower wall  33   a  in the recess of the front cowl  33  and the hanging frame  44 . 
     This can further stabilize the posture of the radar device  60 . 
     The motorcycle  1  of this embodiment includes the radar stay  70  which is connected to the attachment portion  44   b  so as to protrude forward from the attachment portion  44   b  of the hanging frame  44 . The radar device  60  is attached to the radar stay  70 . 
     This allows the radar device  60  to be located further forward, so that the electromagnetic waves transmitted and received by the radar device  60  are less likely to be blocked. 
     In the motorcycle  1  of this embodiment, the radar stay  70  includes the first attachment surface (the upper surface of the first attachment portion  71 ) and the second attachment surface (the front surface of the second attachment portion  72 ). The radar device  60  is attached to the first attachment surface via the vibration reduction member  102 . The orientation of the second attachment surface is different from the orientation of the first attachment surface. The radar device  60  is attached to the second attachment surface via the vibration reduction member  104 . 
     Accordingly, the vibration in various directions is hard to transmit to the radar device  60 , because the radar device  60  is supported by using the vibration reduction member in the two directions. 
     In the motorcycle  1  of this embodiment, the first attachment surface is a surface perpendicular to the up-down direction. The second attachment surface is a surface perpendicular to the front-rear direction. 
     As a result, vertical vibrations transmitted from a road surface or the like can be reduced by the vibration reduction member  102  on the first attachment surface. In addition, the vibration reduction member  104  of the second attachment surface can reduce the vibration in the front-rear direction caused by the bending of the hanging frame  44  due to acceleration and deceleration of the motorcycle  1 . 
     In the motorcycle  1  of this embodiment, the radar device  60  includes the orientation adjustment mechanism  62  that adjusts the orientation of the radar device  60  by operating it from the rear side. The opening portion  72   a  is formed in the second attachment surface of the radar stay  70  for operating the adjustment portion  62   a  of the orientation adjustment mechanism  62 . 
     As a result, it is possible to achieve both a configuration that reduces vibration in the front-rear direction and a configuration that enables operation of the orientation adjustment mechanism  62  from the rear. 
     In the motorcycle  1  of this embodiment, the radar device  60  includes the orientation adjustment mechanism  62  for adjusting the orientation of the radar device  60 . The radar device  60  is attached to the radar stay  70  so that the radar device  60  does not come into contact with the lower wall  33   a  in the recess of the front cowl  33 . 
     This prevents, for example, the radar device  60  from contacting the lower wall  33   a  even when the radar device  60  is oriented so as to be inclined downwardly. 
     In the motorcycle  1  of this embodiment, the radar device  60  is located below all of the engine control unit, the relay box, and the headlight. 
     This allows the radar device  60  to be located relatively lower by utilizing the hanging frame  44 . 
     The motorcycle  1  of this embodiment includes the headlight  32  irradiating the front of the motorcycle  1 . The headlight  32  and the radar device  60  are arranged so that the headlight  32  and the radar device  60  overlap in plan view and so that the radar device  60  is lower than the headlight  32 . 
     Accordingly, since a space is created by arranging the radar device  60  relatively lower by using the hanging frame  44 , the headlight  34  can be arranged in the space. 
     The motorcycle  1  of this embodiment includes the camera  35  that acquires information for performing vehicle control. The camera  35 , the headlight  32 , and the radar device  60  are arranged in this order from the top in the up-down direction. 
     Accordingly, since a space is created at the upper side by arranging the radar device  60  relatively lower by using the hanging frame  44 , the camera  35  and the headlight  32  can be arranged in the space. 
     In the motorcycle  1  of this embodiment, the camera  35 , the headlight  32 , and the radar device  60  overlap with the straight line drawn parallel to the up-down direction in the front view. 
     As a result, the position of the camera  35 , the headlight  32 , and the radar device  60  in the vehicle width direction is aligned, so that the size of the motorcycle  1  in the vehicle width direction can be reduced. 
     While a preferred embodiment and variations of the present invention have been described above, the configurations described above may be modified, for example, as follows. 
     The radar device  60  of the above embodiment is not limited to a rectangular shape, but may be other shape. The position of the orientation adjustment mechanism  62  and the connector  63  may be different from the above embodiment. The cover further covering the main body  61  of the radar device  60  and the orientation adjustment mechanism  62  may be integrally configured. 
     The radar stay  70  of the above embodiment protrudes forward from the hanging frame  44 . The radar stay  70  may be configured to protrude in different directions from the hanging frame  44 . The radar stay  70  of the above embodiment has two attachment surfaces. There may be one or more than three attachment surfaces of the radar stay  70 . 
     The radar bracket  80  of the above embodiment comprises a single member. Alternatively, the radar bracket  80  may comprise a plurality of components assembled together. The radar bracket  80  of the above embodiment has two attachment surfaces. There may be one or more than three attachment surfaces of the radar bracket  80 . 
     In the above embodiment, an example of applying the present invention to a motorcycle  1  is described, but the present invention can also be applied to other straddle vehicles. Other straddle vehicles are, for example, vehicles with two front wheels and one rear wheel, vehicles with one front wheel and two rear wheels, vehicles with two front wheels and two rear wheels, or the like. Other example of a four-wheeled vehicles are all terrain vehicle (ATV), which is primarily used for driving on unpaved terrain.