Patent Publication Number: US-2022225516-A1

Title: Electronic Control Unit

Description:
TECHNICAL FIELD 
     The present invention relates to an electronic control unit. 
     BACKGROUND ART 
     In the related art, an electronic control unit that controls a vehicle is known. The electronic control unit includes an electronic control board inside a housing. The electronic control unit secures waterproofness by providing a seal member in the housing. However, the housing is deformed due to a difference between an air pressure inside the housing and an air pressure outside the housing. The difference between the air pressure inside the housing and the air pressure outside the housing is caused by a temperature difference between air inside the housing and air outside the housing. The temperature difference between the air inside the housing and the air outside the housing is caused by self-heating or submersion of the vehicle. Since deformation of the housing imposes a load on the seal member, the seal member is separated from the housing. As a result, the electronic control unit is weakened in waterproofness. The electronic control unit is required to have a structure that suppresses a load on the seal member in order to ensure waterproofness. 
     A technique of PTL 1 includes a parallel seal portion substantially parallel to a surface of a board, an outer peripheral seal portion, and an inclined seal portion connecting the parallel seal portion and the outer peripheral seal portion. In the inclined seal portion, a connection end with the outer peripheral seal portion is closer to a back side of an internal space than a connection end with the parallel portion in a lateral direction. As a result, the electronic device can reduce a size in a longitudinal direction of the housing while suppressing tearing of a sealing material. 
     A technique of PTL 2 includes a substantially trapezoidal connector, a case configured such that the connector is fitted into a recess, and a sealing material that seals between the connector and the case. A case slope inclination angle formed by a side facing a short side of the case and an inclined surface is larger than a connector slope inclination angle formed by a short side and the inclined surface of the connector. Since the connector slope inclination angle is smaller than the case slope inclination angle, it is possible to reduce an amount of pressing of the sealing material. As a result, a filling amount of the sealing material can be sufficiently secured even on a long side of the connector. 
     CITATION LIST 
     Patent Literature 
     PTL 1: JP 2009-230925 A 
     PTL 2: JP 2004-319169 A 
     SUMMARY OF INVENTION 
     Technical Problem 
     In PTL 1, waterproofness is secured by the parallel seal portion, the outer peripheral seal portion, and the inclined seal portion. Since the electronic device includes the inclined seal portion, it is possible to suppress tearing of the sealing material when an upper case and a lower case are assembled to the connector. However, PTL 1 does not describe that the waterproofness is weakened by deformation of the upper case or the lower case. 
     In PTL 2, the sealing material on the long side of the connector is thicker than the sealing material on the short side of the connector. As a result, the sealing material can alleviate the influence of the stress received from the connector due to thermal expansion of the connector. However, PTL 2 does not describe that the waterproofness is weakened by deformation of the case. 
     Therefore, the present invention is made to solve the above problems, and provides an electronic control unit capable of improving waterproof reliability. 
     SOLUTION TO PROBLEM 
     According to an aspect of the present invention, there is provided an electronic control unit including: an electronic control board; a connector provided on one end side of one surface of the electronic control board; a cover provided on the one surface side and covering the electronic control board and the connector; and a base provided on another surface side of the electronic control board so as to face the cover; and a seal member interposed between the connector and the cover, in which the connector includes: a connector main body; a plurality of terminals arranged in a longitudinal direction of the connector main body and provided so as to protrude from the connector main body toward the one end side, the connector main body includes: an attachment surface attached to the electronic control board; a seal arrangement portion which is positioned on a surface on a side facing the attachment surface and on which the seal member is disposed, the seal arrangement portion includes: a first seal arrangement portion formed in an arrangement direction of the terminals; a second seal arrangement portion that is continuous with both end portions of the first seal arrangement portion and is inclined toward the electronic control board as it goes toward another end side facing the one end side of the electronic control board, the first seal arrangement portion includes a plurality of predetermined portions formed so as to be directed toward the electronic control board from a center side of the first seal arrangement portion toward both end sides of the first seal arrangement portion at both end portions of the first seal arrangement portion, the cover includes a plurality of bent portions formed so as to be directed toward the electronic control board from a center side of the cover toward both end sides of the cover, and each of the predetermined portions is in contact with each of the bent portions. 
     Advantageous Effects of Invention 
     According to the present invention, waterproof reliability can be improved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an exploded view of an electronic control unit according to a first embodiment. 
         FIG. 2  is a perspective view of the electronic control unit. 
         FIG. 3  is an explanatory view of a seal arrangement portion. 
         FIG. 4  is a schematic cross-sectional view of the electronic control unit illustrated in  FIG. 3  taken along line IV-IV. 
         FIG. 5  is an explanatory view of a second seal arrangement portion in a second embodiment. 
         FIG. 6  is a schematic cross-sectional view of the second seal arrangement portion illustrated in  FIG. 5  taken along line VI-VI. 
         FIG. 7  is a perspective view of an electronic control unit according to a third embodiment. 
         FIG. 8  is an explanatory view of a second seal arrangement portion. 
         FIG. 9  is an explanatory view of a curved portion. 
         FIG. 10  is a perspective view of an electronic control unit according to a fourth embodiment. 
         FIG. 11  is an explanatory view of an attachment bracket in a fifth embodiment. 
         FIG. 12  is an explanatory view of a seal arrangement portion in a sixth embodiment. 
         FIG. 13  is a schematic cross-sectional view of the seal arrangement portion illustrated in  FIG. 12  taken along line XIII-XIII. 
         FIG. 14  is an explanatory view of a seal arrangement portion in a seventh embodiment. 
         FIG. 15  is a schematic cross-sectional view of the seal arrangement portion illustrated in  FIG. 14  taken along line XV-XV. 
         FIG. 16  is an explanatory view of a seal arrangement portion in an eighth embodiment. 
         FIG. 17  is a schematic cross-sectional view of the seal arrangement portion illustrated in  FIG. 16  taken along line XVII-XVII. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of the present invention will be described, but the present embodiment is not limited to the embodiment described in each drawing. The present embodiment relates to an electronic control unit  1  capable of improving waterproof reliability. 
     In the drawing, an x-axis direction indicates, for example, a longitudinal direction of a connector main body  21 . A y-axis direction indicates, for example, a direction that passes through one end side of an electronic control board  6  on which a connector  2  is provided and the other end side corresponding to the one end side of the electronic control board  6  and is perpendicular to the x-axis direction. A z-axis direction indicates, for example, a direction perpendicular to a surface of the electronic control board  6 . 
     A direction in which the connector  2  is positioned with respect to the electronic control board  6  on a y axis may be referred to as a front direction. A direction in which the electronic control board  6  is positioned with respect to the connector  2  on the y axis may be referred to as a depth direction. A direction in which a cover  3  is positioned with respect to the electronic control board  6  on a z axis may be referred to as an upward direction. A direction in which the base  4  is positioned with respect to the electronic control board  6  on the z axis may be referred to as a downward direction. 
     In the following description, an “upper side” refers to a predetermined portion positioned upward from a central portion of a predetermined member. A “lower side” indicates a predetermined portion positioned downward from a central portion of a predetermined member. A “front side” indicates a predetermined portion positioned in a front direction from a central portion of a predetermined member. A “depth side” indicates a predetermined portion positioned in a depth direction from a central portion of a predetermined member. 
     The electronic control unit  1  controls a vehicle, for example. The electronic control unit  1  includes, for example, the electronic control board  6 , the connector  2 , the cover  3 , the base  4 , and a seal member  5 . 
     The electronic control board  6  is provided with, for example, an electronic circuit that controls the vehicle. The electronic circuit is provided with, for example, an electronic component such as a memory or a central processing unit (CPU) in which a program is stored. 
     The connector  2  electrically connects, for example, a circuit of the vehicle and the electronic control board  6 . The connector  2  is provided on one end side of the one surface  61  of the electronic control board  6 . 
     The cover  3  protects the electronic control board  6  from foreign matters, liquid, or the like. The cover  3  is provided on a side of the one surface  61  of the electronic control board  6  and covers the electronic control board  6  and the connector  2 . The cover  3  includes a plurality of bent portions  312  formed so as to be directed toward the electronic control board  6  side from a center side of the cover  3  toward both end sides of the cover  3 . 
     The base  4  supports the electronic control board  6 , the connector  2 , and the cover  3 . The base  4  is provided on the other surface  62  side of the electronic control board  6  so as to face the cover  3 . 
     The seal member  5  suppresses intrusion of foreign matters, liquid, or the like into the electronic control unit  1 . The seal member  5  is interposed between at least any two of the connector  2 , the cover  3 , and the base  4 . 
     The connector  2  includes a connector main body  21  and a plurality of terminals  23  provided to protrude from the connector main body  21  to one end side of the electronic control board  6 . 
     The connector main body  21  includes an attachment surface  24  attached to the electronic control board  6  and a surface  25  on a side facing the attachment surface  24 . The connector main body  21  includes a seal arrangement portion  210 , in which the seal member  5  is disposed, on the surface  25 . 
     The seal arrangement portion  210  includes a first seal arrangement portion  211  and a second seal arrangement portion  212 . The first seal arrangement portion  211  is formed in a longitudinal direction of the connector main body portion  21 . 
     The first seal arrangement portion  211  includes a plurality of predetermined portions  2112  formed so as to be directed toward the electronic control board  6  side from the center side of the first seal arrangement portion  211  toward both end sides of the first seal arrangement portion at both end portions  213  of the first seal arrangement portion  211 . Each of the predetermined portions  2112  is in contact with each of the bent portions  312 . That is, the bent portion  312  covers each predetermined portion  212 . 
     The second seal arrangement portion  212  is continuous with both end portions  213  of the first seal arrangement portion  211  and is inclined toward the electronic control board  6  as it goes toward the other end side facing the one end side of the electronic control board  6 . 
     Each terminal  23  electrically connects the circuit of the vehicle and the electronic control board  6 . The terminals  23  are arranged in the longitudinal direction of the connector main body  21 . 
     The electronic control unit  1  described above can include the bent portion  312  in the cover  3  by including the predetermined portion  2112 . When receiving a force to peel off the cover  3  from the connector  2  due to an increase in internal pressure or the like, the cover  3  including the bent portion  312  is less likely to be deformed than when the cover  3  is formed in a planar shape. As a result, the electronic control unit  1  can suppress a load on the seal member  5 , and thus, waterproof reliability can be improved. 
     Embodiments of the electronic control unit  1  will be described with reference to the drawings. 
     First Embodiment 
       FIG. 1  is an exploded view of the electronic control unit  1 . The electronic control unit  1  controls a vehicle, for example. The electronic control unit  1  includes, for example, the electronic control board  6 , the connector  2 , the cover  3 , the base  4 , and a seal member  5 . 
     The electronic control board  6  is provided with, for example, an electronic component such as a memory or a CPU in which a program is stored. The electronic control board  6  is formed in, for example, a flat quadrangular shape. In the electronic control board  6 , a through hole  611  penetrating from one surface  61  to the other surface  62  is formed at a position corresponding to a screw hole  44  to be described below. The electronic control board  6  is assembled to the base  4  by, for example, fastening screws in the through holes  611 . 
     The connector  2  electrically connects, for example, a circuit of the vehicle and the electronic control board  6 . The connector  2  is provided on the front side of the one surface  61  of the electronic control board  6 . Note that the connector  2  may be electrically connected to the electronic control board  6  by soldering, press fitting, or the like. 
     The connector  2  includes the connector main body  21  and a plurality of terminals  23 . The connector main body  21  is formed by a portion formed in the x-axis direction where each terminal  23  is provided and a portion formed in the depth direction from both end portions of the portion formed in the x-axis direction. The connector main body  21  is made of resin such as PolyButylene Terephthalate (PBT), PolyAmide (PA), or Poly Phenylene Sulfide (PPS). 
     The connector main body  21  includes, for example, the attachment surface  24  attached to the electronic control board  6  and the surface  25  on the side facing the attachment surface  24 . For example, a protrusion  241  protruding downward is formed on the attachment surface  24 . The connector  2  is attached to the base  4  by the protrusion  241 . 
     The surface  25  is provided with the seal arrangement portion  210  in which the seal member  5  is disposed. The seal arrangement portion  210  includes, for example, the first seal arrangement portion  211  and the second seal arrangement portion  212 . The first seal arrangement portion  211  is formed in a longitudinal direction of the connector main body portion  21 . The first seal arrangement portion  211  includes the plurality of predetermined portions  2112  and a flat surface seal arrangement portion  2111 . 
     Each predetermined portion  2112  is provided, for example, at both end portions  213  of the first seal arrangement portion  211 . Each predetermined portions  2112  is formed so as to be directed downward from the center side of the first seal arrangement portion  211  toward both end sides of the first seal arrangement portion. 
     The flat surface seal arrangement portion  2111  is provided between the predetermined portions  2112 . In the first seal arrangement portion  211 , the seal member  5  is disposed in the longitudinal direction of the connector main body  21 . 
     The second seal arrangement portion  212  is continuous with both end portions  213  of the first seal arrangement portion  211  and is inclined toward the electronic control board  6  side as it goes in the depth direction. One lower end of the second seal arrangement portion  212  is in contact with the base-side seal arrangement portion  42 . 
     Each terminal  23  is provided to protrude from the connector main body  21  to one end side of the electronic control board  6 . The terminals  23  are arranged in the longitudinal direction of the connector main body  21 . Each terminal  23  includes, for example, a resin portion  231  and a metal wire material (not illustrated). For example, the same member as that of the connector main body  21  may be used as the resin portion  231 . 
     The cover  3  protects the electronic control board  6  from foreign matters, liquid, or the like. The cover  3  is provided on a side of the one surface  61  of the electronic control board  6  and covers the electronic control board  6  and the connector  2 . The cover  3  includes an upper surface  31  provided in the upward direction of the electronic control board  6 , a plurality of side surfaces  32  provided at both ends in the x-axis direction of the upper surface  31 , a back surface  33  provided at one end in the depth direction of the upper surface  31 , and a stopper  34 . 
     The upper surface  31  includes, for example, a flat surface portion  311  formed in a planar shape and the plurality of bent portions  312 . The flat surface portion  311  is positioned between the bent portions  312  in the x-axis direction. The bent portion  312  is formed so as to be directed downward from both ends of the flat surface portion  311  in the x-axis direction toward the side surface  32 . 
     Each of the side surfaces  32  includes an inclined portion  321  on the front side. For example, the inclined portion  321  is formed so as to be directed downward as extending in the depth direction. That is, each side surface  32  is formed in, for example, a trapezoidal shape in which an upper side  322  is longer than a lower side  323 . 
     The stopper  34  comes into contact with the base  4  when the cover  3  is attached to the base  4  and supports the cover  3 . The stopper  34  is formed so as to protrude from each of the side surfaces  32  and the back surface  33 , for example. 
     The base  4  supports the electronic control board  6 , the connector  2 , and the cover  3 . The base  4  is provided on the other surface  62  side of the electronic control board  6  so as to face the cover  3 . The base  4  includes, for example, a bottom surface  41 , a base-side seal arrangement portion  42 , an attachment bracket  43  which is an example of an “attachment portion”, and the screw hole  44 . 
     The bottom surface  41  is, for example, a quadrangular surface covering the downward direction of the electronic control board  6 . The base-side seal arrangement portion  42  is provided on an outer edge portion of the bottom surface  41 . 
     The base-side seal arrangement portion  42  is, for example, a groove formed along an outer edge of the bottom surface  41 . 
     The seal member  5  is disposed in the base-side seal arrangement portion  42 . 
     The electronic control unit  1  is attached to another device by each attachment bracket  43 . The electronic control unit  1  is attached to the vehicle by, for example, each attachment bracket  43 . The attachment brackets  43  are provided at both ends of the base  4  in the x-axis direction. 
     The screw hole  44  is, for example, a hole for attaching the electronic control board  6  to the base  4  with a screw. For example, a plurality of screw holes  44  are provided on the inner edge side of the base-side seal arrangement portion  42 . 
     The cover  3  and the base  4  may be made of resin such as PBT, PPS, or PA, for example. The cover  3  and the base  4  may be formed of, for example, metal containing aluminum, iron, or the like as a main component. 
     The seal member  5  suppresses entry of liquid or foreign matters into the electronic control unit  1 . 
     The seal member  5  may be, for example, an adhesive made of a material such as a silicon-based material, an epoxy-based material, or a urethane-based material. The seal member  5  may be, for example, an O-ring made of a rubber-based material. 
     The seal member  5  has an adhesive function. As illustrated in  FIG. 2 , the cover  3  is bonded to the connector  2 . That is, the one end portion  3111  on the front side of the flat surface portion  311  of the cover  3  is bonded to the flat surface seal arrangement portion  2111  by the seal member  51  disposed in the flat surface seal arrangement portion  2111 . One end portion  3121  on the front side of each bent portion  312  is bonded to each predetermined portion  2112  by a seal member  52  disposed at the predetermined portion  2112 . The inclined portion  321  is adhered to the second seal arrangement portion  212  by the seal member  53  disposed in the second seal arrangement portion  212 . 
     The connector  2  is bonded to the base  4 . That is, the protrusion  241  of the connector  2  is bonded to the one side  421  on the front side and both end sides  422  of the base-side seal arrangement portion  42  by the seal member  54  disposed in the base-side seal arrangement portion  42 . 
     The cover  3  is bonded to the base  4 . That is, the lower side  323  of the side surface  32  of the cover  3  is adhered to both end sides  422  of the base-side seal arrangement portion  42  by the seal member  54 . 
     The lower side of the back surface  33  of the cover  3  is bonded to one side on the depth side of the base-side seal arrangement portion  42  by the seal member  54 . 
       FIG. 3  is an explanatory view of the seal arrangement portion  210 . The flat surface seal arrangement portion  2111  includes a flat surface-side groove portion  21112  and a flat surface-side bank portion  21111 . The seal member  5  is disposed in the flat surface-side groove portion  21112 . The flat surface-side bank portion  21111  suppresses leakage of the seal member  5 . The flat surface-side bank portion  21111  is formed by the flat surface-side groove portion  21112 . 
     The predetermined portion  2112  includes a predetermined groove portion  21122  continuous with the flat surface-side groove portion  21112 , an end-side groove portion  21123  continuous with the predetermined groove portion  21122  and the second seal arrangement portion  212 , and a predetermined bank portion  21121  formed by the predetermined groove portion  21122  and the end-side groove portion  21123 . 
     The predetermined groove portion  21122  is formed in a shape directed toward the electronic control board  6  side from the center side of the first seal arrangement portion  211  toward both end sides of the first seal arrangement portion. The predetermined groove portion  21122  is formed in, for example, a slope shape directed toward the electronic control board  6  side at a constant angle θ 1  from the center side of the first seal arrangement portion  211  toward both ends of the first seal arrangement portion  211 . 
     The end-side groove portion  21123  is, for example, a groove formed in the y-axis direction. The end-side groove portion  21123  is positioned below the flat surface-side groove portion  21112 . 
     The predetermined bank portion  21121  is formed in a slope shape directed toward the electronic control board side at a constant angle θ 2  from the center side of the first seal arrangement portion  211  toward both ends of the first seal arrangement portion  211 . The position of one end of the predetermined bank portion  21121  at both end portions  213  of the first seal arrangement portion  211  is positioned downward from the position of the flat surface-side bank portion  21111 . 
     The second seal arrangement portion  212  includes an inclined bank portion  2121  and an inclined groove portion  2122 . The inclined groove portion  2122  is a groove in which the seal member  5  is disposed. The inclined groove portion  2122  is continuous with the end-side groove portion  21123 . 
     The inclined bank portion  2121  is formed by the inclined groove portion  2122 . The inclined bank portion  2121  is continuous with the predetermined bank portion  21121  at both end portions  213  of the first seal arrangement portion  211 . 
       FIG. 4  is a schematic cross-sectional view of the electronic control unit illustrated in  FIG. 3  taken along line IV-IV. The cover  3  is, for example, a flat surface type seal structure in which a lower surface  3112  of the cover  3  covers the first seal arrangement portion  211 . That is, the cover  3  is bonded to the flat surface seal arrangement portion  2111  by being bonded to the seal member  5 . In this case, the flat surface-side bank portion  21111  comes into contact with the lower surface  3112  of the cover  3 . A depth dimension h 1  of the flat surface-side groove portion  21112  is set to a length that can suppress leakage from the flat surface-side bank portion  21111  when the seal member  5  is applied to the flat surface-side groove portion  21112 , for example. 
     The cover  3  is pushed and deformed from the inside by the increase in the internal pressure of the electronic control unit  1 . At this time, the cover  3  tends to be separated upward from the seal member  5 . The seal member  5  receives a load when one end on the front side of the cover  3  is deformed upward. 
     The magnitude of the load applied to the seal member  5  varies depending on rigidity against the upward deformation of the cover  3 . That is, a magnitude of the load applied to the seal member varies depending on a magnitude of a cross-sectional secondary moment of the cover  3 . 
     The electronic control unit  1  described above can include the bent portion  312  in the cover  3  by including the first seal arrangement portion  211 . The cover  3  including the bent portion  312  has higher rigidity against a force applied in the upward direction than a cover formed in a planar shape. As a result, the cover  3  is less likely to be bent and deformed by the air pressure inside the electronic control unit  1 . As a result, stress applied to the seal member  5  is suppressed, and waterproof reliability is improved. 
     A function of the electronic control unit is added along with high functionality of the vehicle. In the electronic control unit, the number of pins of the connector and the number of electronic components increase with addition of functions. As a result, the size of the electronic control unit increases as the functionality of the vehicle increases. However, along with the increase in size of the connector, it is difficult to secure a region where the seal arrangement portion is provided around the connector. Accordingly, the electronic control unit is required to be downsized. 
     In order to secure a space in a vehicle interior, an engine room in which the electronic control unit is disposed is densified by other devices. Accordingly, the electronic control unit mounted in the engine room is also required to be downsized. 
     In the electronic control unit  1 , both end portions  213  of the first seal arrangement portion  211  are positioned in the lower direction than the flat surface seal arrangement portion  2111 . The position of the upper end of the second seal arrangement portion  212  is positioned in the downward direction with respect to a case where the both end portions  213  of the first seal arrangement portion  211  are positioned on an extension line of the flat surface seal arrangement portion  2111  in the x-axis direction. Since the second seal arrangement portion  212  is inclined from a position closer to the base portion  4 , the size in the y-axis direction is reduced. As a result, since the connector  2  is downsized, the electronic control unit  1  can be downsized. By reducing the size of the connector  2 , a cost for manufacturing the electronic control unit  1  can be reduced. 
     As the cover, for example, an insertion type seal structure is conceivable in which the cover is bonded to the connector by inserting the protrusion provided on the cover or one end of the cover into the seal member disposed in the connector. However, a depth dimension of the groove of the insertion type seal structure is longer than a length of the cover to be inserted. As a result, the depth dimension of the groove of the insertion type seal structure is longer than the depth dimension of the groove of the flat surface type seal structure. Since the first seal arrangement portion  211  has the flat surface type seal structure, the size of the electronic control unit  1  in the z-axis direction can be made smaller than that of the insertion type seal structure. 
     Since the seal member  5  has the adhesive function, at least any two of the connector  2 , the cover  3 , and the base  4  can be adhered. This improves assembly performance of the electronic control unit  1 . 
     The cover  3  can easily form the bent portion  312  by being formed of resin. The cover  3  may be made of metal. In this case, the cover  3  releases heat of air inside the electronic control unit  1  to the outside. As a result, the cover  3  can suppress an increase in the air pressure inside the electronic control unit  1 . 
     Second Embodiment 
     Since the present embodiment corresponds to a modification of the first embodiment, differences from the first embodiment will be mainly described.  FIG. 5  is an explanatory view of a second seal arrangement portion  212   a.  The second seal arrangement portion  212   a  is continuous with both end portions  213  of the first seal arrangement portion  211  and is inclined downward as it goes in the depth direction. 
     The second seal arrangement portion  212   a  includes the inclined bank portion  2121  and an inclined groove portion  2122   a.  The inclined groove portion  2122   a  is a groove in which the seal member  5  is disposed. The inclined groove portion  2122   a  is continuous with the end-side groove portion  21123 . The inclined groove portion  2122   a  is an insertion type seal structure in which the inclined portion  321  is inserted into the seal member  5  disposed in the inclined groove portion  2122   a.    
       FIG. 6  is a schematic cross-sectional view of the second seal arrangement portion  212   a  illustrated in  FIG. 5  taken along line VI-VI. A depth dimension h 2  of the inclined groove portion  2122   a  is formed to be longer than a depth dimension h 1  of the flat surface-side groove portion  21112 . The depth dimension h 2  of the inclined groove portion  2122   a  is longer than the length in which the side surface  32  of the cover  3  is inserted, for example. 
     The seal member  5  is disposed in the inclined groove portion  2122   a.  The cover  3  is bonded to the connector  2   a  by inserting the inclined portion  321  of the cover  3  into the seal member  5  disposed in the inclined groove portion  2122   a.  Note that the inclined groove portion  2122   a  is not limited to a rectangular shape, and may have an inclined surface in the x-axis direction. 
     A holding force by the seal member  5  is proportional to a contact area between each member and the seal member  5 . In the case of the flat surface type seal structure, the contact area between the cover  3  and the seal arrangement portion  210  can be increased by increasing the width of the inclined groove portion  2122   a  of the second seal arrangement portion  212   a  in the x-axis direction. However, as the second seal member  212   a  expands in the x-axis direction, the size of an electronic control unit  1   a  increases in the x-axis direction. 
     Since the electronic control unit la described above includes the inclined groove portion  2122   a,  the inclined portion  321  can be inserted into the seal member  5  disposed in the second seal arrangement portion  212   a.    
     As a result, the contact area between the inclined portion  321  and the seal member  5  can be made larger than that in the case of the flat surface type seal structure without enlarging the second seal arrangement portion  212   a  in the x-axis direction. As a result, the electronic control unit la can improve the holding force of the seal member  5  of the cover  3 . Since the deformation of the cover  3  can be suppressed by improving the holding force of the cover  3 , the electronic control unit la can suppress the stress generated in the flat surface seal arrangement portion  2111 . 
     Third Embodiment 
     Since the present embodiment corresponds to the modification of the first embodiment and the second embodiment, differences from the first embodiment and the second embodiment will be mainly described.  FIG. 7  is a perspective view of an electronic control unit  1   b.  A connector  2   b  of the electronic control unit  1   b  is provided with a curved portion  2123 . The electronic control unit  1   b  includes, for example, the electronic control board  6 , a connector  2   b,  a cover  3   b,  a base  4   b,  and the seal member  5 . 
     The connector  2   b  electrically connects, for example, a circuit of the vehicle and the electronic control board  6 . The connector  2   b  includes a connector main body  21   b  and a plurality of terminals  23 . The connector main body  21   b  is formed by a portion formed in the x-axis direction where each terminal  23  is provided and a portion formed in the depth direction from both end portions of the portion formed in the x-axis direction. A curved portion  26  is formed in a portion formed in the depth direction. The curved portion  26  will be described below with reference to  FIG. 8 . 
     The connector main body  21   b  includes, for example, the attachment surface  24  attached to the electronic control board  6  and a surface  25   b  on a side facing the attachment surface  24 . The surface  25   b  is provided with a seal arrangement portion  210   b  where the seal member  5  is placed. The seal arrangement portion  210   b  includes, for example, a first seal arrangement portion  211  and a second seal arrangement portion  212   b.  The second seal arrangement portion  212   b  will be described below with reference to  FIG. 8 . 
     The cover  3   b  protects the electronic control board  6  from foreign matters, liquid, or the like. The cover  3   b  is provided on the one surface  61  side of the electronic control board  6  and covers the electronic control board  6  and the connector  2   b.  The cover  3 b includes an upper surface  31  positioned in the upward direction of the electronic control board  6 , a plurality of side surfaces  32   b  provided at both ends in the x-axis direction of the upper surface  31 , and a back surface  33  provided on the depth side of the upper surface  31 . 
     The side surface  32   b  includes, for example, an inclined portion  321   b  formed on the front side and a plurality of curved portions  324 . The inclined portion  321   b  is formed so as to be directed to downward as going in the depth direction. The curved portion  324  will be described below. 
     The base  4   b  supports the electronic control board  6 , the connector  2   b,  and the cover  3   b.  The base  4   b  is provided on the other surface  62  side of the electronic control board  6  so as to face the cover  3   b.  The base  4   b  includes, for example, a bottom surface  41 , a base-side seal arrangement portion  42 , an attachment bracket  43 , a screw hole  44 , and a curved portion  45 . The curved portion  45  will be described below. 
       FIG. 8  is an explanatory view of the second seal arrangement portion  212   b.  The second seal arrangement portion  212   b  is continuous with both end portions  213  of the first seal arrangement portion  211  and is inclined downward as it goes in the depth direction. 
     The second seal arrangement portion  212   b  includes a curved portion  2123  curved in the longitudinal direction of the connector main body portion  21   b.  That is, the second seal arrangement portion  212   b  includes the upper inclined portion  2124  continuous with both end portions  213  of the first seal arrangement portion  211  and the lower inclined portion  2125  in contact with the base-side seal arrangement portion  42 . The upper inclined portion  2124  and the lower inclined portion  2125  are connected by a curved portion  2123 . Note that an inclination direction of the upper inclined portion  2124  and an inclination direction of the lower inclined portion  2125  may have a parallel relationship of being separated from each other in the x-axis direction. 
     The lower inclined portion  2125  is positioned outside the upper inclined portion  2124  in the x-axis direction. 
     The outside is a direction from the central portion of the first seal arrangement portion  211  to both end portions  213 . The lower inclined portion  2125  may be positioned on the center side in the x-axis direction with respect to the upper inclined portion  2124 . 
     The second seal arrangement portion  212   b  includes an inclined bank portion  2121   b  and an inclined groove portion  2122   b.  The inclined groove portion  2122   b  is a groove in which the seal member  5  is disposed. The inclined groove portion  2122   b  is continuous with the end-side groove portion  21123 . The inclined groove portion  2122   b  is curved in the x-axis direction at the curved portion  2123 . 
     The inclined bank portion  2121   b  is formed by the inclined groove portion  2122   b.  The inclined bank portion  2121   b  is continuous with the predetermined bank portion  21121  at both end portions  213  of the first seal arrangement portion  211 . The inclined bank portion  2121   b  is curved in the x-axis direction at the curved portion  2123 . 
     The curved portion  26  forms the shape of the curved portion  2123  to the attachment surface  24  in the downward direction of the curved portion  2123 . That is, the curved portion  26  is curved in the x-axis direction. 
     Returning to  FIG. 7 , the curved portion  324  of the side surface  32   b  of the connector  2   b  is formed at a position corresponding to the curved portion  2123  of the second seal arrangement portion  212   b.  That is, the curved portion  324  is formed in a shape that can be inserted into the inclined groove portion  2122   b  of the curved portion  2123 . The curved portion  324  is formed in the upward direction of the curved portion  2123 . 
     The curved portions  45  formed at both ends in the x-axis direction of the base  4   b  are formed at positions corresponding to the curved portions  2123  of the second seal arrangement portion  212   b.  That is, the curved portion  324  is formed in the downward direction of the curved portion  26 . 
     Note that the curved portion  324  and the curved portion are not limited to positions corresponding to the curved portion  2123 , and may be formed in the depth direction from the connector main body  21   b.  In this case, the shapes of the curved portion  324  and the curved portion  45  correspond to each other. The curved portion  324  and the curved portion  45  are not limited to being curved outward in the x-axis direction, and may be curved inward in the x-axis direction. 
       FIG. 9  is an explanatory view of the curved portion  2123 . The curved portion  2123  is provided at a position of the second seal arrangement portion  212   b  on the other end side of the attachment bracket  43  provided on one end side of the electronic control board  6 . The curved portion  2123  includes an outer portion  261  positioned outside the upper inclined portion  2124 . The outer portion  261  is formed at a position away from the one end portion  432  on the depth side of the attachment bracket  43  by a predetermined distance d 1 . 
     Since the electronic control unit  1   b  described above includes the curved portion  2123 , the curved portion  324  can be provided on the side surface  32   b  of the cover  3 . As a result, in the cover  3 , the rigidity of the cover  3  with respect to the air pressure inside the electronic control unit  1  increases as compared with the cover in which the curved portion  324  is not formed. Accordingly, deformation of the cover  3  can be suppressed. 
     The second seal arrangement portion  212   b  where the curved portion  2123  is formed can be formed longer than a seal arrangement portion that is not curved. As a result, the electronic control unit  1   b  can improve the adhesive force by providing the curved portion  2123  in the second seal arrangement portion  212   b.  As a result, the electronic control unit lb can improve the waterproof reliability. 
     Since the curved portion  2123  is formed in the depth direction from the attachment bracket  43 , the electronic control unit  1   b  can improve the adhesive force without increasing a size of the attachment bracket  43  in the outer direction. 
     Since the electronic control unit lb includes the curved portion  2123  curved outward, the internal space of the electronic control unit  1   b  can increase as compared with a case where the curved portion  2123  is not provided. As a result, the electronic control unit  1   b  can include a larger electronic control board. As a result, since the number of electronic components provided on the electronic control board can increase, the electronic control unit  1   b  can cope with high functionality. 
     Fourth Embodiment 
     The present embodiment corresponds to modifications of the first to third embodiments, and thus differences from the first to third embodiments will be mainly described.  FIG. 10  is a perspective view of an electronic control unit  1   c.  The electronic control unit  1   c  includes, for example, the electronic control board  6 , the connector  2   b,  a cover  3   c,  the base  4   b,  and the seal member  5 . 
     The cover  3   c  includes the upper surface  31  positioned in the upward direction of the electronic control board  6 , a plurality of side surfaces  32   c  provided at both ends in the x-axis direction of the upper surface  31 , and the back surface  33  provided on the depth side of the upper surface  31 . 
     The side surface  32   c  includes, for example, the inclined portion  321   b  formed on the front side, the plurality of curved portions  324 , and a fastening portion  35 . 
     The cover  3  is attached to the base  4  by a fastening portion  35 . The fastening portion  35  may be, for example, a snap fit to be fitted using elasticity of the material of the cover  3   c.  Note that the fastening portion  35  is not limited to the snap-fit, and may be screwed, heat-staked, bonded, welded, or the like. The fastening portion  35  is provided, for example, in the depth direction with respect to the connector main body  21   b.    
     The electronic control unit  1   c  can more firmly attach the cover  3  to the base  4  by including the fastening portion  35 . As a result, the electronic control unit  1   c  can improve the waterproof reliability. 
     Fifth Embodiment 
     The present embodiment corresponds to modifications of the first to fourth embodiments, and thus differences from the first to fourth embodiments will be mainly described.  FIG. 11  is an explanatory view of an attachment bracket  43   d.  The electronic control unit  1   d  includes, for example, an electronic control board  6 , a connector  2 , a cover  3 , a base  4   d,  and a seal member  5 . 
     The base  4   d  supports the electronic control board  6 , the connector  2 , and the cover  3 . The base  4   d  is provided on the other surface  62  side of the electronic control board  6  so as to face the cover  3 . The base  4   d  includes, for example, the bottom surface  41 , the base-side seal arrangement portion  42 , the attachment bracket  43   d,  and the screw hole  44 . 
     The electronic control unit  1   d  is attached to another device by the attachment bracket  43   d.  The plurality of attachment brackets  431   d  positioned in the front direction are disposed on both sides of the connector  2 . That is, the plurality of attachment brackets  431   d  positioned in the front direction are disposed in predetermined regions d 2  at both ends of the base  4   d  positioned outside the connector main body  21  in the x-axis direction. 
     Vibration, impact, or the like is applied from the vehicle to the electronic control unit  1   d  connected to the vehicle. As the distance from the portion fixed by the attachment bracket  43   d  increases, the influence of resonance due to vibration, impact, or the like increases, and the load on the seal member  5  increases. 
     In the electronic control unit  1   d  described above, the attachment bracket  43   d  is provided in the predetermined region d 2  of the base  4   d,  and thus, the periphery of the connector  2  is firmly fixed to the vehicle. As a result, the electronic control unit  1   d  can suppress the influence of vibration, impact, or the like from the vehicle on the connector  2 . Accordingly, the electronic control unit  1   d  can suppress a load applied to the seal member  5 . As a result, the electronic control unit  1   d  can improve waterproof reliability. 
     The electronic control unit  1   d  can suppress deformation of the periphery of the connector  2  to the seal member  5  caused by stress applied to the connector  2  when the connector  2  is fitted to the terminal of the electronic circuit of the vehicle. Accordingly, the electronic control unit  1   d  can suppress a load applied to the seal member  5 . As a result, the electronic control unit  1   d  can improve waterproof reliability. 
     Sixth Embodiment 
     The present embodiment corresponds to modifications of the first to fifth embodiments, and thus differences from the first to fifth embodiments will be mainly described.  FIG. 12  is an explanatory view of a first seal arrangement portion  211   e.    
     The first seal arrangement portion  211   e  includes a predetermined groove portion  21122   e  having a step shape. 
     The first seal arrangement portion  211  includes a plurality of predetermined portions  2112   e  and the flat surface seal arrangement portion  2111 . 
     Each predetermined portion  2112   e  is provided, for example, at both end portions  213  of the first seal arrangement portion  211   e.  Each predetermined portion  2112   e  is formed so as to be directed toward the electronic control board  6  side from the center side of the first seal arrangement portion  211   e  toward both end sides of the first seal arrangement portion  211   e.    
     The predetermined portion  2112   e  includes a predetermined groove portion  21122   e  continuous with the flat surface-side groove portion  21112 , an end-side groove portion  211   e  positioned at both end portions  213  of the first seal arrangement portion  21122   e  and continuous with the predetermined groove portion  21123   e  and the second seal arrangement portion  212 , and a predetermined bank portion  21122   e  formed by the predetermined groove portion  21123   e  and the end-side groove portion  21121   e.    
     The predetermined groove portion  21122   e  is formed in a stepped shape from both ends of the flat surface-side groove portion  21112  toward the end-side groove portion  21123   e  in the lateral direction of the connector main body  21   e.  The end-side groove portion  21123   e  is positioned in the lower direction than the flat surface-side groove portion  21112 . That is, the predetermined groove portion  21122   e  is formed so as to connect the flat surface-side groove portion  21112  and the end-side groove portion  21123  in the z-axis direction. The predetermined bank portion  21121   e  is formed, for example, in the x-axis direction and is continuous with the flat surface-side bank portion  21111 . 
       FIG. 13  is a schematic cross-sectional view of the seal arrangement portion  210   e  illustrated in  FIG. 12  taken along line XIII-XIII. A cover  3   e  for protecting the electronic control board  6  from foreign matters, liquid, or the like is bonded to the connector  2   e  by a seal member  5 . 
     The cover  3   e  is provided on the one surface  61  side of the electronic control board  6  and covers the electronic control board  6  and the connector  2   e . The cover  3   e  includes an upper surface  31   e  positioned in the upward direction of the electronic control board  6 , a plurality of side surfaces  32  provided at both ends of the upper surface  31   e  in the x-axis direction, and a back surface  33  provided on the depth side of the upper surface  31   e.    
     The upper surface  31   e  includes the flat surface portion  311  and bent portions  312   e  provided at both ends of the flat surface portion  311  in the x-axis direction. The bent portion  312   e  is formed, for example, downward from both ends of the flat surface portion  311 . The bent portion  312   e  is inserted into the seal member  5  disposed in the end-side groove portion  21123   e.    
     The depth dimension h 3  of the end-side groove portion  21123   e  may be longer than the depth dimension h 1  of the flat surface-side groove portion  21112 . The depth dimension h 3  of the end-side groove portion  21123   e  is set to, for example, a length into which the end portion of the bent portion  312   e  is inserted. 
     Since the first seal arrangement portion  211   e  described above includes the predetermined groove portion  21122   e,  the depth dimension h 3  of the end-side groove portion  21123   e  can be made longer than the depth dimension h 1  of the flat surface-side groove portion  21112 . As a result, it is possible to provide an insertion seal structure in which the bent portion  312   e  of the cover  3  is inserted into the seal member  5  disposed in the end-side groove portion  21123   e.    
     The contact area between the seal member  5  and the bent portion  312  is larger than the contact area between the seal member and the bent portion in the case of the flat surface type seal structure. As a result, the predetermined groove portion  21122   e  can improve the holding force of the cover  3   e.    
     Since the first seal arrangement portion  211   e  described above includes the predetermined groove portion  21122   e  having a step shape, the cover portion  3   e  can include the bent portion  312   e.  Since the cover  3   e  includes the bent portion  312   e,  the cover  3   e  is less likely to be deformed in a stripping direction as compared with the case of a planar shape without the bent portion  312   e . Accordingly, the cover  3   e  can suppress stress on the seal member  5 . 
     Seventh Embodiment 
     The present embodiment corresponds to modifications of the first to sixth embodiments, and thus differences from the first to sixth embodiments will be mainly described.  FIG. 14  is an explanatory view of a first seal arrangement portion  211   f.    
     The first seal arrangement portion  211   f  includes arc-shaped predetermined portions  2112   f  at both ends. 
     The first seal arrangement portion  211   f  includes a plurality of predetermined portions  2112   f  and the flat surface seal arrangement portion  2111 . 
     Each predetermined portion  2112   f  is provided, for example, at both end portions  213  of the first seal arrangement portion  211   f.  Each predetermined portion  2112   f  is formed so as to be directed toward the electronic control board  6  side from the center side of the first seal arrangement portion  211   f  toward both end sides of the first seal arrangement portion  211   f.    
     The predetermined portion  2112   f  includes a predetermined groove portion  21122   f  continuous with the flat surface-side groove portion  21112 , an end-side groove portion  211   f  positioned at both end portions  213  of the first seal arrangement portion  21122   f  and continuous with the predetermined groove portion  21123   f  and the second seal arrangement portion  212 , and a predetermined bank portion  21121   f  formed by the predetermined groove portion  21122  and the end-side groove portion  21123 . 
     The predetermined groove portion  21122   f  is formed in a shape directed toward the electronic control board  6  side from the center side of the first seal arrangement portion  211   f  toward both end sides of the first seal arrangement portion  211   f.    
     The predetermined groove portion  21122   f  has, for example, an arc shape in which an inclination of a tangent of the predetermined groove portion  21122   f  in the x-axis direction gradually changes from one end of the predetermined groove portion  211 f on the central side of the first seal arrangement portion  21122   f  toward the other end of the predetermined groove portion  211   f  on both end sides of the first seal arrangement portion  21122   f.  The end-side groove portion  21123  is positioned below the flat surface-side groove portion  21112 . 
     The predetermined bank portion  21121   f  has an arc shape in which the inclination of the tangent of the predetermined bank portion  21121   f  in the x-axis direction gradually changes from one end of the predetermined bank portion  211   f  on the central side of the first seal arrangement portion  21121   f  toward the other end of the predetermined bank portion  211   f  at both ends of the first seal arrangement portion  21121   f.    
       FIG. 15  is a schematic cross-sectional view of the first seal arrangement portion  211   f  illustrated in  FIG. 14  taken along line XV-XV. A cover  3   f  for protecting the electronic control board  6  from foreign matters, liquid, or the like is bonded to the connector  2   f  by a seal member  5 . 
     The cover  3   f  is provided on the one surface  61  side of the electronic control board  6  and covers the electronic control board  6  and the connector  2   f . The cover  3   f  includes an upper surface  31   f  positioned in the upward direction of the electronic control board  6 , a plurality of side surfaces  32  provided at both ends of the upper surface  31   f  in the x-axis direction, and a back surface  33  provided on the depth side of the upper surface  31   f.    
     The upper surface  31   f  includes a flat surface portion  311  and bent portions  312   f  provided at both ends of the flat surface portion  311  in the x-axis direction. The bent portion  312   f  has, for example, an arc shape in which the inclination of the tangent line of the bent portion  312   f  on the flat surface portion  311  side gradually changes toward the other end of the bent portion  312   f  at both ends of the cover  3   f.  Both end portions of the cover  3   f  are in contact with both end portions  213  of the first seal arrangement portion  211   f.    
     Since the first seal arrangement portion  211   f  described above includes the arc-shaped groove portion  21122   f,  the seal member  5  gradually moves from the flat surface-side groove portion  21112  to the end-side groove portion  21123   f.  Accordingly, since the seal member  5  is applied to the first seal arrangement portion  211   f,  assembly performance can be improved. 
     Eight Embodiment 
     The present embodiment corresponds to modifications of the first to eighth embodiments, and thus differences from the first to eighth embodiments will be mainly described.  FIG. 16  is an explanatory view of a first seal arrangement portion  211   g.    
     The first seal arrangement portion  211   g  includes a plurality of predetermined portions  2112   g  and the flat surface seal arrangement portion  2111 . 
     Each predetermined portion  2112   g  is provided, for example, at both end portions  213  of the first seal arrangement portion  211   g.  Each predetermined portion  2112   g  is formed so as to be directed toward the electronic control board  6  side from the center side of the first seal arrangement portion  211   g  toward both end sides of the first seal arrangement portion  211   g.    
     The predetermined portion  2112   g  includes a predetermined groove portion  21122   g,  an end-side groove portion positioned at both end portions  213  of the first seal arrangement portion  211   g  and continuous with the predetermined groove portion  21122   g  and the second seal arrangement portion  212 , and a predetermined bank portion  21122   g  formed by the predetermined groove portion  21121   g  and the end-side groove portion  21123 . 
     The predetermined groove portion  21122   g  is a combination of at least two of the predetermined groove portion  21122  having a slope shape, the predetermined groove portion  21122   e  having a step shape, and the groove portion  21122   f  having an arc shape. The predetermined groove portion  21122   g  is formed by, for example, a combination of a predetermined groove portion  21122  having a slope shape and a predetermined groove portion  21122   e  having a step shape. 
     That is, the predetermined groove portion  21122   g  includes, for example, a plurality of predetermined groove portions  21122  having a slope shape at both ends of the flat surface-side groove portion  21112 . The predetermined groove portion  21122   g  includes, for example, a stepped groove portion  21122   e  at one end of each predetermined groove portion  21122  having a slope shape on both end sides of the first seal arrangement portion  211   g.    
     The end-side groove portion of the first seal arrangement portion  211   g  is, for example, an end-side groove portion  21123   e.  The end-side groove portion of the first seal arrangement portion  211   g  is not limited to the end-side groove portion  21123   e,  and may be the end-side groove portion  21123 , the end-side groove portion  21123   f,  or the like. 
     The predetermined bank portion  21121   g  is at least one of a predetermined bank portion  21121  having a slope shape or a predetermined bank portion  21121   f  having an arc shape. The predetermined bank portion  21121   g  is, for example, a predetermined bank portion  21121  having a slope shape. 
       FIG. 17  is a schematic cross-sectional view of the seal arrangement portion  210   f  illustrated in  FIG. 16  taken along line XVII-XVII. A cover  3   g  for protecting the electronic control board  6  from foreign matters, liquid, or the like is bonded to the connector  2   g  by a seal member  5 . 
     The cover  3   g  is provided on the one surface  61  side of the electronic control board  6  and covers the electronic control board  6  and the connector  2   g.  The cover  3   g  includes an upper surface  31   g  positioned in the upward direction of the electronic control board  6 , a plurality of side surfaces  32  provided at both ends in the x-axis direction of the upper surface  31   g,  and a back surface  33  provided on the depth side of the upper surface  31   g.    
     The upper surface  31   g  includes a flat surface portion  311  and bent portions  312   g  provided at both ends of the flat surface portion  311  in the x-axis direction. The bent portion  312   g  is a combination of at least two or more of a bent portion  312  having a slope shape, a bent portion  312   e  having a step shape, and a bent portion  312   f  having an arc shape. 
     The bent portion  312   g  is formed by, for example, a combination of a bent portion  312  having a slope shape and a bent portion  312   e  having a step shape. 
     Since the first seal arrangement portion  211   g  described above includes the predetermined groove portion  21122  having an inclined shape and the predetermined groove portion  21122   e  having a step shape, the cover  3   g  can include the bent portion  312  and the bent portion  312   e.  Since the cover  3   g  includes the bent portion  312  and the bent portion  312   e,  rigidity against a force in a direction in which the cover  3   g  is peeled off from the connector  2   g  can be improved. Accordingly, the cover  3   g  can suppress a load on the seal member  5 . 
     Note that the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above embodiments are described in detail for the purpose of clearly explaining the present invention, and are not necessarily limited to those including all the configurations described. Further, a portion of the configurations of an embodiment can be replaced with the configurations of another embodiment. In addition, the configurations of another embodiment can be added to the configurations of an embodiment. Further, it is possible to perform addition/deletion/replacement on other configurations with respect to a portion of the configurations of each embodiment. 
     REFERENCE SIGNS LIST 
     
         
           1  electronic control unit 
           2  connector 
           3  cover 
           4  base 
           5  seal member 
           6  electronic board 
           21  connector main body 
           210  seal arrangement portion 
           211  first seal arrangement portion 
           2112  predetermined portion 
           212  second seal arrangement portion 
           213  both end portions 
           23  terminal 
           231  resin portion 
           24  attachment surface 
           241  protrusion 
           25  opposing surface 
           31  upper surface 
           311  flat surface portion 
           3111  end portion 
           312  bent portion 
           3121  end portion 
           32  side surface 
           321  inclined portion 
           322  upper side 
           323  lower side 
           33  back surface 
           34  stopper 
           41  bottom surface 
           42  base-side seal arrangement portion 
           421  front surface side 
           422  side surface side 
           423  back surface side 
           43  attachment bracket 
           44  screw hole 
           61  one surface 
           62  other surface 
           611  through hole