JP6525152B2 - Method for drilling car body and exterior panel - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a vehicle body of a mobile body such as a car and a method of drilling an exterior panel constituting the vehicle body.

  In order to sell a car, an on-board camera unit may be attached to the body of the finished car as a retrofit. In mounting the on-vehicle camera unit, an exterior panel forming a vehicle body is drilled by a drill. The in-vehicle camera unit is disposed in the formed opening. Thus, the on-vehicle camera unit is attached to the vehicle body. The in-vehicle camera unit is covered with a cover attached to the outer surface of the exterior panel. The cover is formed with a window for exposing the lens of the on-vehicle camera unit.

JP, 2013-6481, A

  In the exterior panel, an opening is formed by a large circle having a diameter larger than the cross section of the on-vehicle camera unit. Since the cross section of the on-vehicle camera unit is substantially rectangular, a large gap is formed between each side of the rectangle and the inner edge of the circular opening. Although the on-vehicle camera unit and the opening are covered with the cover, when strong water stream is sprayed toward the window hole due to rain, car wash, etc., there is a possibility that water may infiltrate the inside of the exterior panel from the large gap.

  An object of the present invention is to provide a method of drilling a vehicle body and an exterior panel which can reduce the opening area of an opening for mounting an on-vehicle camera unit as compared with the prior art.

  In order to achieve the above object, according to one aspect of the present invention, a great circle shorter than the diagonal of a reference virtual rectangle and having a diameter larger than the longest side of the virtual rectangle and protruding outside the large circle The present invention relates to a vehicle body including an exterior panel having an opening whose outline is formed by four small circles individually including the four vertex areas of the virtual rectangle, and a camera unit disposed in the opening.

  The virtual rectangle reflects the projected image of the cross section of the camera unit. If the diameter of the great circle is shorter than the diagonal of the virtual rectangle, the gap between each side of the rectangle and the inner edge of the opening defined by the great circle is compared to the case where the diameter of the great circle is larger than the diagonal of the virtual rectangle. to shrink. The four small circles extend outward from the great circle, and the edge of the opening is constituted by four circular arcs defined by the great circle and four circular arcs defined by the small circle. The camera unit can fit within the aperture without the corners of the camera unit interfering with the inner edge of the aperture. The opening area of the opening can be reduced as compared to the case where the opening is formed simply by one great circle.

  The center of the small circle may be disposed on the bisector of the inner angle of the virtual rectangle. Thus, the position of the small circle can be uniquely determined with respect to the great circle. Since the positional relationship between the large circle and the small circle is clarified, the repeatability of the drilling performed by the drill bit or the like for forming the opening is secured. In this way, the positional relationship between the large circle and the small circle is clearly understood in advance, so that the camera unit can be surely fitted in the opening.

  Alternatively, the center of the small circle may be arranged on the diagonal of the virtual rectangle. Thus, the position of the small circle can be uniquely determined with respect to the great circle. Since the positional relationship between the large circle and the small circle is clarified, the repeatability of the drilling performed by the drill bit or the like for forming the opening is secured. In this way, the positional relationship between the large circle and the small circle is clearly understood in advance, so that the camera unit can be surely fitted in the opening.

  The center of the small circle may be disposed equidistant from the center of the great circle.

  The vehicle body may further include a cover that covers the opening. As the opening area of the opening is reduced, the cover is miniaturized accordingly. Thus, the appearance of the car body is improved.

  According to another aspect of the present invention, the outer panel is drilled with a large diameter drill bit having a diameter shorter than the diagonal line of the reference virtual rectangle and larger than the longest side of the virtual rectangle. Forming an opening of a circle, and forming the exterior panel with a small diameter drill bit having a diameter corresponding to the diameter of four small circles individually including the four vertex regions of the virtual rectangle protruding outside the large circle And puncturing the outer panel to form an opening of the small circle in the outer panel.

  A cross section of the camera unit or the like is projected on the virtual rectangle. If the diameter of the great circle is shorter than the diagonal of the virtual rectangle, the gap will shrink between each side of the rectangle and the inner edge of the opening defined by the great circle. Since the four small circles protrude outward from the great circle, the camera unit can fit within the opening without the corners of the camera unit interfering with the inner edge of the opening. The opening area of the opening can be reduced as compared to the case where the opening is drilled with a single large diameter drill bit.

  In the case of the drilling method of the exterior panel, the opening of the small circle may be drilled prior to the opening of the large circle. Since the opening of the small circle is formed in the vertex area of the virtual rectangle, the exterior panel remains in most of the virtual rectangle even if the opening of the small circle is formed. Since the center of a great circle remains by this, drilling processing of a great circle becomes easy. Thus, the large diameter drill bit can pierce the large circle opening at a definitely determined position. If the large circle opening is formed prior to the small circle opening, the tip of the small diameter drill bit must be held at the specified position in the air within the large circle opening, without additional guides. In this case, the difficulty of the work is significantly increased.

  As described above, according to the present invention, there is provided a vehicle body and an exterior panel drilling method capable of reducing the opening area of the opening for the on-vehicle camera unit as compared with the prior art.

FIG. 1 is a perspective view schematically showing an overview of a car as a moving body. It is an expansion perspective view of the camera unit supported by the vehicle body. It is an expansion perspective view of a camera unit observed in the state where a cover was removed. FIG. 4 is a vertical sectional view taken along line 4-4 of FIG. 2; It is a top view which shows the outline of an opening roughly. It is a top view which shows the difference in opening area roughly. It is a top view which respond | corresponds to FIG. 5 and shows arrangement | positioning of the small circle which concerns on other embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings.

  FIG. 1 schematically shows an automobile 11 as a mobile body. The automobile 11 includes a vehicle body 12. Two front wheels 13 and two rear wheels 14 are rotatably supported on the vehicle body 12. The vehicle body 12 is supported on the ground by front wheels 13 and rear wheels 14. The vehicle body 12 can move along the ground according to the rotation of the front wheel 13 and the rear wheel 14.

  The vehicle body 12 is provided with an exterior panel 15. The exterior panel 15 constitutes the appearance of the vehicle body 12. The exterior panel 15 is formed of, for example, an iron plate. The surface of the iron plate is painted.

  An on-vehicle camera unit 16 is attached to the rear of the vehicle body 12. The camera unit 16 is supported by the vehicle body 12. As shown in FIG. 2, the camera unit 16 is covered by a cover 17. The cover 17 is formed with a window hole 18 for exposing the lens of the camera unit 16. The cover 17 is attached to the outer surface of the exterior panel 15 with, for example, a double-sided tape. The cover 17 may be made of, for example, a resin molded body.

  As shown in FIG. 3, the exterior panel 15 is formed with an opening 19. The camera unit 16 is disposed in the opening 19. The optical axis 22 of the lens 21 is directed to the rear of the vehicle body 12. The optical axis 22 of the lens 21 is inclined from the vehicle body 12 toward the ground.

  Here, the outline of the camera unit 16 projected on a virtual plane orthogonal to the optical axis 22 draws a substantially square. Therefore, the lengths of the four sides of the contour are equal. Since the camera unit 16 is inclined around the horizontal axis of the imaging device, as shown in FIG. 4, the cross section 23 of the camera unit 16 which is transversely cut by a virtual plane including the outer surface of the exterior panel 15 Become. The short side of the cross section 23 extends parallel to a horizontal plane parallel to the ground, and has a length P of one side of a square drawn in the aforementioned virtual plane. The short side drawn on the virtual plane has the same length as the short side of the camera unit 16. The long side of the cross section 23 extends parallel to the vertical plane perpendicular to the ground, and has a length Q greater than one side of the square drawn in the aforementioned virtual plane. The length Q of the long side can be uniquely calculated based on the trigonometric function according to the angle of the backward inclination.

  As shown in FIG. 5, the opening 19 of the exterior panel 15 is formed based on a combination of one great circle 25 and four small circles 26a, 26b, 26c, 26d. The four small circles 26a, 26b, 26c, 26d are superimposed on the great circle 25. The individual small circles 26a, 26b, 26c, 26d partially protrude outward from the great circle 25. The size of the opening 19 formed by the large circle 25 and the small circles 26 a, 26 b, 26 c, 26 d is set larger than the cross section 23 of the camera unit 16. In FIG. 5, the cross section 23 of the camera unit 16 is projected on the great circle 25 as a virtual rectangle 27. The diameter of the great circle 25 is shorter than the diagonal line 28 of the virtual rectangle 27 and larger than the longest side of the virtual rectangle 27, ie, the long side 29a. The gap 36 formed between the large circle 25 and the long side 29a is larger than the gap 37 formed between the large circle 25 and the short side 29b.

  The four vertices 31 of the virtual rectangle 27 protrude outward from the great circle 25. A vertex area 32 is defined between the vertex 31 and the great circle 25. Small circles 26a, 26b, 26c and 26d are arranged for each vertex 31. Each vertex area 32 is contained within the corresponding small circle 26a, 26b, 26c, 26d. The vertex region 32 does not extend outside the small circles 26a, 26b, 26c, 26d. Here, the centers of the small circles 26 a, 26 b, 26 c, 26 d are disposed on the bisector of the inner corner 31 of the virtual rectangle 27. Moreover, the centers Cd of the four small circles 26 a, 26 b, 26 c, 26 d are equidistant from the center Cc of the great circle 25. The center Cc of the great circle 25 overlaps the intersection of the diagonal lines 28 of the virtual rectangle 27. Thus, the contour of the opening 19 is shaped by the great circle 25 and the small circles 26a, 26b, 26c, 26d. The fixing surface of the cover 17 is disposed on the outer surface of the exterior panel 15 outside the opening 19.

  As described above, the virtual rectangle 27 is a projection image of the cross section 23 of the camera unit 16. If the diameter of the great circle 25 is shorter than the diagonal 28 of the virtual rectangle 27, compared with the case where the diameter of the great circle 25 is longer than the diagonal 28 of the virtual rectangle 27, the sides 29a and 29b of the rectangle of the great circle 25 The clearance between the inner edge of the opening 19 defined by the circle 25 is reduced. The four small circles 26 a, 26 b, 26 c, 26 d protrude outward from the great circle 25 so that the camera unit 16 can fit within the opening 19 without the corners of the camera unit 16 interfering with the inner edge of the opening 19. . The opening area of the opening 19 can be reduced as compared to the case where one large circle opening having a diameter larger than the diagonal 28 of the virtual rectangle 27 is simply drilled. As the opening 19 is reduced, the cover 17 is miniaturized accordingly. Thus, the appearance of the vehicle body 12 is improved.

  In the vehicle body 12, the center Cd of the small circles 26a, 26b, 26c, 26d is disposed on the bisector of the inner angle 31 of the virtual rectangle 27. Thus, the positions of the small circles 26a, 26b, 26c and 26d are uniquely determined with respect to the great circle 25. Since the positional relationship between the large circle 25 and the small circles 26a, 26b, 26c, 26d is clarified, the repeatability of the perforation is secured. Thus, the positional relationship between the large circle 25 and the small circles 26a, 26b, 26c, 26d is clearly grasped in advance, so that the camera unit 16 can be surely fitted in the opening 19.

  The centers Cd of the small circles 26a, 26b, 26c, 26d are equidistant from the center Cc of the great circle 25.

  Next, a method of forming the opening 19 will be described. A drill is used to form the opening 19. A large diameter drill bit drills the large circle 25, and a small diameter drill bit drills the small circles 26a, 26b, 26c, 26d. The large diameter drill bit has an outer diameter suitable for drilling the large circle 25. That is, the diameter of the large diameter drill bit is shorter than the diagonal 28 of the virtual rectangle 27 and corresponds to a diameter larger than the long side 29 a of the virtual rectangle 27. The small diameter drill bit has an outer diameter suitable for drilling the small circles 26a, 26b, 26c, 26d. That is, the diameter of the small diameter drill bit has a diameter corresponding to the diameter of the small circles 26a, 26b, 26c, 26d that individually include the apex regions 32.

  Instructions are attached to the outer surface of the exterior panel 15. In the instruction sheet, the center Cc of the great circle 25 and the center Cd of the four small circles 26a, 26b, 26c, 26d are described. Prior to the opening of the large circle 25, the operator places a recess on the center Cd of the small circles 26a, 26b, 26c, 26d with a center punch or the like and applies the tip of the small diameter drill bit there to punch the opening. The exterior panel 15 is formed with openings of four small circles 26a, 26b, 26c, 26d at predetermined positions determined by the instruction sheet.

  Subsequently, the axis of the drill bit is positioned at the center Cc of the great circle 25 according to the instruction of the instruction sheet. A hollow is placed on the center Cc of the large circle 25 with a center punch or the like, and the tip of a large diameter drill bit is placed there to pierce an opening. An opening of the great circle 25 is formed so as to partially overlap the four small circles 26a, 26b, 26c, 26d. Since the openings of the small circles 26a, 26b, 26c and 26d are formed in the vertex region 32 of the virtual rectangle 27, even if the openings of the small circles 26a, 26b, 26c and 26d are formed, most of the virtual rectangle 27 is covered The panel 15 remains. Since the center of a great circle remains by this, drilling processing of a great circle becomes easy. Thus, the large diameter drill bit can pierce the opening of the great circle 25 at a predetermined position. If the opening of the great circle 25 is formed prior to the openings of the small circles 26a, 26b, 26c, 26d, the tip of the small diameter drill bit must be held at the specified position in the air within the opening of the great circle 25. In addition, without additional guides, the difficulty of the operation is significantly increased.

The inventor verified the opening area of the opening 19. A camera unit 16 having a 24 mm square cross section was assumed for verification. Since an inclination of 25 degrees is set with respect to the vertical line of the exterior panel 15, as shown in FIG. 6A, the cross section 23 of the camera unit 16 has a short side of 24 mm, a long side of 25.7 mm, and 33 A diagonal of .0 mm was identified. A large circle 34 with a diameter of 36 mm was drawn by a large diameter drill bit. Within the great circle 34, the cross section 23 of the camera unit 16 is included. That is, interference was avoided between the corners of the camera unit 16 and the edge of the opening of the great circle 34. The area of the gap shown by the dotted portion calculated by subtracting the area of the virtual rectangle 27 from the area of the circle 34 was 407 mm ² .

As shown in FIG. 6B, a large circle 25 with a diameter of 30.0 mm was drawn corresponding to the large diameter drill bit of the present embodiment. The diameter of the large diameter drill bit was set shorter than the diagonal 33.0 mm and larger than the long side (= 25.7 mm). Four 10 mm diameter small circles 26a, 26b, 26c, 26d are drawn on the large circle 25. The small circles 26 a, 26 b, 26 c, 26 d individually include the vertex regions 32 of the cross section 23 protruding outside the great circle 25. The centers Cd of the small circles 26a, 26b, 26c, 26d are arranged equidistantly from the center of the great circle 25 on the diagonal 28 of the cross section 23. Thus, interference was avoided between the corners of the camera unit 16 and the edge of the aperture 19. The area of the gap shown by the dotted portion calculated by subtracting the area of the virtual rectangle 27 from the area of the opening 19 formed by the large circle 25 and the small circles 26a, 26b, 26c, 26d was 202 mm ² . It was confirmed that the opening area was reduced to less than half.

As shown in FIG. 6 (c), four middle circles 35 were drawn by middle drill bits having a diameter smaller than the above-mentioned large diameter drill bit and larger than the minor drill bit. The diameter of the middle circle 35 was set to 20.0 mm. The middle circle 35 included the cross section 23 of the camera unit 16 while partially overlapping each other. The area of the gap shown by the dotted portion calculated by subtracting the area of the virtual rectangle 27 from the area of the opening 19 formed by the four middle circles 35 was 409 mm ² . The effectiveness of the opening 19 according to the present embodiment is supported.

  As shown in FIG. 7, the center Cd of the small circles 26 a, 26 b, 26 c, 26 d may be disposed on the diagonal 28 of the virtual rectangle 27 in forming the opening 19. Thus, the positions of the small circles 26a, 26b, 26c, 26d can be uniquely determined with respect to the great circle 25. Since the positional relationship between the large circle 25 and the small circles 26a, 26b, 26c, 26d is clarified, the repeatability of the perforation is secured. Thus, the positional relationship between the large circle 25 and the small circles 26a, 26b, 26c, 26d is clearly grasped in advance, so that the camera unit 16 can be surely fitted in the opening 19.

  12 body, 15 exterior panels, 16 camera units, 17 covers, 19 openings, 25 large circles, 26a small circles, 26b small circles, 26c small circles, 26d small circles, 27 virtual rectangles, 28 diagonals, 29a long sides, 32 vertices Region, Cc Center of the Great Circle, Cd Center of the Small Circle.

Claims (5)

A large circle shorter than the diagonal of the reference virtual rectangle and having a larger diameter than the longest side of the virtual rectangle, and the four vertex regions of the virtual rectangle protruding outside the large circle are individually contained inside An exterior panel having an opening contoured by four small circles;
And a camera unit having a cross section defined by the virtual rectangle in a virtual plane including the outer surface of the exterior panel, and a camera unit disposed in the opening.   The vehicle body according to claim 1, wherein a center of the small circle is disposed on a bisector of an inner angle of the virtual rectangle.   The vehicle body according to claim 1, wherein a center of the small circle is disposed on a diagonal of the virtual rectangle.   The vehicle body according to claim 2 or 3, wherein the center of the small circle is disposed equidistant from the center of the great circle. Shorter than the diagonal of the imaginary rectangle which corresponds to the cross section of the camera unit in a virtual plane including the outer surface of the face panel, drilled in the face panel with a large diameter drill bit having a diameter larger than the longest side of the virtual rectangle Applying a large circle opening to the exterior panel;
The exterior panel is drilled with a small diameter drill bit having a diameter corresponding to the diameter of four small circles individually including the four vertex areas of the virtual rectangle protruding outside the large circle, and the exterior panel Forming an opening of the small circle in
A drilling method of an exterior panel comprising:

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