JP6150682B2 - Vehicle back door - Google Patents

Description

  The present invention relates to an improvement in a vehicle back door. More particularly, the present invention relates to a countermeasure against scattering of a panel at the time of a rear collision of a vehicle in a vehicle back door provided with a door body made of a resin panel.

  Patent Document 1 includes a door main body formed by joining a resin inner panel and a resin outer panel and having an internal space between the two panels, and a window portion is provided in the upper half of the door main body. A vehicle back door is disclosed. This back door has a reinforcement bracket (reinforce) as a rigid member that reinforces the inner panel at the left and right side edges from the upper half to a part of the lower half of the inner panel. A latch device (lock reinforcement) that engages with the provided striker is attached.

  And in this back door, in order to prevent scattering of the panel which constitutes the door body due to breakage at the time of a rear-end collision of the vehicle, an upper end portion is formed in the inner space of the lower portion located below the window portion in the door body. Is connected to the reinforcing bracket, and a wire having a lower end connected to the latch device is installed along the outer edge of the inner panel.

JP 2010-159037 A

  However, in the back door of Patent Document 1, although both ends of the wire are connected to the vehicle body via the reinforcing bracket and the latch device, the wires remain on the inner panel and the outer panel except for these both ends. Moreover, it is constructed along the outer edge of the inner panel. For this reason, since the panel which comprises the part at the center part in the lower part of a door main body may fly at the time of the rear surface collision of a vehicle, it is desired to take a countermeasure against panel scattering.

  The present invention has been made in view of such a point, and the object of the present invention is to prevent the lower panel even if the inner panel and the outer panel constituting the lower part of the door body are scattered at the time of a rear collision of the vehicle. It is in providing the vehicle back door which can prevent that a big hole opens in the location corresponding to a part.

  In order to achieve the above object, according to the present invention, a reinforcing sheet-like material having stretchability is stretched in the vehicle width direction in the interior space in the lower portion of the door body, and the reinforcing sheet-like material is stretched in the vertical direction. The upper and lower edges of each of the lower and upper edges of the lower part are bonded to the door body at the bonding part between the inner panel and the outer panel.

  Specifically, the present invention includes a door body that is formed by joining a resin inner panel and a resin outer panel so as to face each other, and has an internal space between the two panels. The following solution is taken for a vehicle back door having a window in a half portion.

  That is, in the first invention, the upper edge portion and the lower edge portion of the lower portion located below the window portion in the door body are bonded portions in which the inner panel and the outer panel are bonded with an adhesive. It has a configuration. In addition, a reinforcing sheet-like material made of stretchable fibers is provided in the inner space in the lower portion of the door body in a state of being expanded in the vehicle width direction. In the first invention, the upper edge portion and the lower edge portion of the reinforcing sheet-like material are sandwiched together with the adhesive between the inner panel and the outer panel at the bonding portion of the lower portion and bonded to the door body. It is characterized by that.

  According to a second invention, in the vehicle back door of the first invention, the reinforcing sheet-like object is a net-like member having a number of meshes. In the second invention, the adhesive for bonding the upper edge portion and the lower edge portion of the reinforcing sheet-like material is attached to one of the inner panel and the outer panel, and the reinforcement is applied from the one panel side. The sheet-like material is wrapped and adhered to the other panel through the mesh of the reinforcing sheet-like material.

  According to a third aspect of the present invention, there is provided the vehicle back door according to the first or second aspect, wherein the bonding portion at at least one of the upper edge portion and the lower edge portion of the lower portion of the door body is an inner panel and an outer panel. Have a bonding margin in which only the adhesive is sandwiched and bonded.

  According to the first aspect of the present invention, the reinforcing sheet-like material is provided in the inner space of the lower portion of the door body in the vehicle width direction, and both the upper edge portion and the lower edge portion of the reinforcing sheet-like material are provided in the lower portion. Because it is bonded to the door body with an adhesive part that is relatively strong and difficult to scatter during a rear-end collision of the vehicle, even if the inner panel and outer panel that constitute the lower part of the door body scatter, the reinforcing sheet The shape can be left in the lower portion in a state where the shape is widened in the vehicle width direction and stretched in the vertical direction. Since this reinforcing sheet-like material has stretchability, even if the lower portion of the door main body is greatly deformed, it is stretched according to the deformation, can withstand an impact at the time of rear-end collision of the vehicle, and is difficult to tear. Therefore, even if both panels constituting the lower part of the door body are scattered at the time of the rear collision of the vehicle, a reinforcing sheet-like material can be left in the part corresponding to the lower part of the back door. It can prevent a large hole from opening.

  According to the second invention, the upper and lower edges of the reinforcing sheet-like material, which is a net-like member, are wrapped with the adhesive from one of the inner panel and the outer panel, and this adhesive is placed on the one panel. Because it adheres to the door body by attaching it to the other panel through the mesh of the reinforcing sheet-like material, the woven or knitted fabric does not have any gaps or holes such as the mesh through which the reinforcing sheet-like material passes. In this case, the adhesive strength of the reinforcing sheet to the outer panel is increased as compared with the case where the upper and lower edges of the reinforcing sheet are separately bonded to the inner panel and the outer panel. In addition, it is possible to simplify the bonding operation of the reinforcing sheet-like material as much as the coating process of the adhesive is completed only once.

  According to the third aspect of the invention, since the adhesive margin that does not sandwich the reinforcing sheet-like material is provided at the adhesive portion at at least one of the upper and lower edges of the door portion, the adhesive portion provided with this adhesive margin Then, the edge of the reinforcing sheet-like material can be bonded to the door body without impairing the sealing performance between the inner panel and the outer panel, and the bonding strength between the inner panel and the outer panel does not have the bonding allowance. Compared to it can be increased.

FIG. 1 is a perspective view showing a rear part of a vehicle body to which a vehicle back door according to an embodiment of the present invention is attached. FIG. 2 is an exploded perspective view of the vehicle back door according to the embodiment of the present invention. FIG. 3 is a front view showing a surface of the inner panel according to the embodiment of the present invention on the outer panel facing side. FIG. 4 is a cross-sectional view of the back door taken along the line IV-IV in FIG. 5 (a) and 5 (b) are process diagrams showing the assembly work of the door body of the back door according to the embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating an example of a state corresponding to the lower portion at the time of a rear collision of the vehicle back door according to the embodiment of the present invention. 7 is a cross-sectional view of a back door corresponding to the lower part of FIG. 4 according to a modification of the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use. In this specification, for convenience of explanation, the front side in the vehicle longitudinal direction is referred to as “front”, the rear side is referred to as “rear”, the left side in the vehicle width direction is referred to as “left”, and the right side is referred to as “right”. The upper side in the direction is called “upper” and the lower side is called “lower”.

  FIG. 1 is a perspective view showing a rear portion of a vehicle body 101 to which a vehicle back door 1 according to this embodiment is attached. As shown in FIG. 1, the back door 1 is for opening and closing a back door opening 103 provided in a rear portion of a vehicle body 101 of a hatchback vehicle. A blinker (rear lamp) 105 is provided at a position corresponding to the lower half of the left and right sides of the back door opening 103 of the vehicle body. In the back door 1 according to the present embodiment, in order to expose these turn signals 105 to the rear of the vehicle body 101, the width in the left-right direction of the lower half of the back door 1 becomes narrower.

  FIG. 2 is an exploded perspective view of the back door 1. As shown in FIG. 2, the back door 1 includes a door body 3 made of a resin panel, and a resin or glass window panel 5 held in the upper half of the door body 3. 1 has a structure in which a window portion 6 (see FIG. 1) is provided at a corresponding portion of the window panel 5. The door body 3 is formed by joining a resin inner panel 7 located on the vehicle inner side (front side) and a resin outer panel 9 located on the vehicle outer side (rear side) to face each other. 7 and 9 has an internal space S (shown in FIG. 4 to be referred to later).

  The inner panel 7 is a single piece, for example, a heat containing fiber reinforcing material such as polypropylene (PP-GF) or carbon fiber-containing polypropylene (PP-CF). It consists of a plastic resin. On the other hand, the outer panel 9 is divided into an upper part and an outer upper panel 9a located on the upper side and an outer lower panel 9b located on the lower side. As will be described in detail later, the window panel 5 is attached between the outer upper panel 9a and the outer lower panel 9b.

  The outer upper panel 9a and the outer lower panel 9b are made of, for example, a resin obtained by mixing polypropylene (PP-T; Polypropylene Talc) with talc or ethylene propylene diene methylene rubber (EPDM). Accordingly, the rigidity of the inner panel 7 is higher than the rigidity of the outer upper panel 9a and the outer lower panel 9b, while the toughness of the outer upper panel 9a and the outer lower panel 9b is higher than the toughness of the inner panel 7. .

  FIG. 3 is a front view showing a surface of the inner panel 7 facing the outer panel 9, that is, a surface of the vehicle rear side. 4 is a cross-sectional view of the back door 1 corresponding to the line IV-IV in FIG. As shown in FIGS. 3 and 4, the inner panel 7 has a main body 11 that faces the outer panel 9. In the main body 11, the upper half portion is formed in a substantially trapezoidal shape with the width in the left-right direction becoming wider toward the lower half portion, and the lower half portion is directed downward along the outer shape of the blinkers 105 on both left and right sides. It is formed in a shape with a narrow width in the left-right direction.

  A window opening 13 extending in the left-right direction is formed in the upper half of the main body 11 of the inner panel 7. The window opening 13 is formed in a substantially trapezoidal shape similar to the upper half portion of the main body 11 of the inner panel 7. Of the inner panel 7, the upper half part including the window opening 13 constitutes the upper part 3 a of the door body 3, and the part located below the window opening 13 constitutes the lower part 3 b of the door body 3. It is composed.

  Moreover, the outer standing wall 15 is integrally protruded from the outer peripheral edge of the main body 11 of the inner panel 7 over the entire circumference so as to rise to the outer panel 9 side. An outer flange 17 for joining is integrally provided at the protruding end of the outer standing wall 15 so as to project outward. The outer flange 17 is formed over the entire circumference of the outer standing wall 15.

  Further, an inner standing wall 19 is integrally projected over the entire periphery of the inner panel 7 around the window opening 13 of the main body 11 so as to rise to the outer panel 9 side. An inner flange 21 for joining is integrally provided at the protruding end of the inner standing wall 19 so as to project inward of the window opening 13. The inner flange 21 is formed over the entire circumference of the inner standing wall 19.

  Of the surface of the inner panel 7 facing the outer panel 9, the upper edge located above the window opening 13, specifically, the portion between the main body 11 and the outer standing wall 15 at the upper edge. As shown in FIG. 3, a pair of left and right hinge mounting portions 23 are provided on both outer sides in the vehicle width direction so as to be spaced from each other. A hinge (not shown) that is fixed to each of the hinge attachment portions 23 with the central axis along the vehicle width direction is attached to the upper edge portion of the back door opening 103 from the front. The back door 1 can open and close the back door opening 103 by rotating in the vertical direction about these hinges.

  A pair of central reinforcements extending parallel to each other in the vertical direction are provided at the center in the vehicle width direction of the lower half portion of the surface of the inner panel 7 facing the outer panel 9 below the window opening 13. The ribs 25 are protruded at intervals in the left-right direction. The upper ends of the central reinforcing ribs 25 are integrally connected to the lower side portion of the inner standing wall 19. The lower ends of the central reinforcing ribs 25 are integrally connected to the lower side portion of the outer standing wall 15.

  Between the pair of central reinforcing ribs 25, a pair of connecting portions 27 extending in parallel in the left-right direction protrudes with an interval in the vertical direction, and the pair of central reinforcing ribs 25 are connected to the connecting portions 27. Are connected by The pair of central reinforcing ribs 25 and the pair of connecting portions 27 form a ladder shape as a whole when viewed from the front. The connection part 27 located on the lower side of the pair of connection parts 27 constitutes a light attachment part to which a light for license plate illumination (not shown) is attached.

  Further, side reinforcing ribs 29 project from the portions of the surface of the inner panel 7 facing the outer panel 9 on the left and right sides of the pair of central reinforcing ribs 25. Both of these side reinforcing ribs 29 extend obliquely downward from the central reinforcing rib 25 side toward the outside in the vehicle width direction. That is, the side reinforcing rib 29 on the left side of the central reinforcing rib 25 extends linearly from the lower left to the right, and the side reinforcing rib 29 on the right side of the central reinforcing rib 25 extends linearly from the lower right to the left. ing. The upper ends of the side reinforcing ribs 29 are integrally connected to the lower side portion of the inner standing wall 19. The lower ends of the side reinforcing ribs 29 are integrally connected to corner portions LP and RP formed by the lower side portion and the side edge portion of the outer standing wall 15.

  The side reinforcing rib 29 on the left side of the central reinforcing rib 25 is a corner portion LP formed by the left end portion of the lower side portion of the outer standing wall 15 and the hinge mounting portion 23 located on the right side of the pair of hinge mounting portions 23. It extends on the line connecting On the other hand, the side reinforcing rib 29 on the right side of the central reinforcing rib 25 is a corner portion RP formed by the right end portion of the hinge mounting portion 23 located on the left side of the pair of hinge mounting portions 23 and the lower side portion of the outer standing wall 15. It extends on the line connecting As a result, when the left and right corners LP and RP of the door body 3 are pushed down to rotate the back door 1 downward from the pushed-up position to change the back door opening 103 from the open state to the closed state. In addition, the load applied to the door body 3 is transmitted to the hinge mounting portion 23 through the side reinforcing ribs 29 and the inner standing wall 19, so that the deformation of the lower portion 3 b of the door body 3 is suppressed.

  As shown in FIGS. 2 and 4, a plurality of lightening holes 31 are formed on the base end side of each side reinforcing rib 29. The plurality of lightening holes 31 penetrate the side reinforcing ribs 29 in the thickness direction, and are provided at intervals along the length direction of the side reinforcing ribs 29. In each side reinforcing rib 29, a relatively thin weak portion 33 is provided between the adjacent hollow holes 31. The thickness of the fragile portion 33 is such a thickness that the fragile portion 33 is broken when the body portion 11 of the inner panel 7 is subjected to a large impact that is deformed or scattered at the time of a rear-end collision of the vehicle. By providing such a fragile portion 33, it is possible to prevent sink marks from occurring in the portions corresponding to the side reinforcing ribs 29, and to prevent the appearance of the inner panel 7 from being impaired.

  The front end portion 35 of each side reinforcing rib 29 is a vertical wall portion 37 (a portion on the extension of the fragile portion 33) extending toward the outer lower panel 9 b side, and the front end of the vertical wall portion 37 in the vehicle width direction of the inner panel 7. It consists of a receiving surface portion 39 extending toward the center, and has an L-shaped longitudinal section. The vertical wall portion 37 and the receiving surface portion 39 are formed thicker than the fragile portion 33, and even the side reinforcing rib 29 having the fragile portion 33 increases the section modulus of the inner panel 7 and improves its rigidity. It is supposed to let you.

  As shown in FIG. 2, the outer upper panel 9 a of the outer panel 9 is formed in an elongated strip shape on the left and right, and constitutes the upper portion 3 a of the door body 3. A stepped portion 41 that is recessed forward is provided at the lower edge portion of the outer upper panel 9a over the entire vehicle width direction. The outer upper panel 9a is opposed to a portion above the window opening 13 of the inner panel 7. The outer peripheral edge of the outer upper panel 9 a is the upper edge of the window opening 13, that is, the upper edge of the inner flange 21, and the outer peripheral edge of the inner panel 7, that is, the outer side edge 17. Are bonded with an adhesive 45 to the upper end portion and the upper side portion.

  On the other hand, the outer lower panel 9 b is formed in a shape in which the left and right widths become narrower toward the lower side corresponding to the shape of the lower half portion of the inner panel 7, and constitutes the lower portion 3 b of the door body 3. A stepped portion 43 that is recessed forward is formed at the upper edge of the outer lower panel 9b over the entire vehicle width direction. The outer lower panel 9 b faces a portion below the window opening 13 of the inner panel 7. The outer peripheral edge of the outer lower panel 9 b is located at the lower edge of the window opening 13, that is, the lower edge of the inner flange 21, and the outer peripheral edge of the inner panel 7, that is, the outer flange 17. The lower half part and the lower side part are bonded with an adhesive 45. A number plate mounting portion 47 is provided at the center of the outer lower panel 9b so as to be recessed forward.

  The window panel 5 is formed in a substantially trapezoidal shape similar to the portion of the upper half portion of the inner panel 7 excluding the portion corresponding to the outer panel 9. The window panel 5 is fitted between a step 41 on the lower edge of the outer upper panel 9a and a step 43 on the upper edge of the outer lower panel 9b. And the upper edge part and lower edge part of the window panel 5 are adhere | attached on these both level | step-difference parts 41 and 43 with the adhesive agent 49 from back. Further, the left and right side edge portions of the window panel 5 are bonded to the left and right side edge portions of the inner panel 7, that is, the side edges of the outer flange 17 with an adhesive 49.

  A region corresponding to the window opening 13 in the window panel 5 is a transparent window region 5a, and an outer region 5b is a concealment region concealed by a concealing layer made of black ceramics or the like. The window region 5 a of the window panel 5 constitutes the window portion 6 together with the window opening 13 formed in the inner panel 7. A through hole 51 through which a motor output shaft of a wiper device (not shown) is inserted is formed in the lower center portion of the window panel 5.

  The adhesive 45 for bonding the outer upper panel 9a and the outer lower panel 9b to the inner panel 7 is a so-called elastic adhesive having rubber elasticity. The elastic adhesive 45 becomes a rubber-like elastic body when cured, and disperses the internal pressure from the adherend and absorbs external stress such as vibration and impact. As a result, the outer upper panel 9a and the portion where the outer lower panel 9b and the inner panel 7 are bonded to each other including the upper and lower edges of the lower portion 3b of the door body 3 are connected to the two panels 7, 9a, 9b is overlapped, which is a relatively thick and relatively strong portion of the door body 3, and the two panels 7, 9a and 9b are formed as an elastic bonding portion 53 bonded with an elastic adhesive 45. . The elastic bonding portion 53 partially absorbs the stress generated in the door main body 3 due to the impact at the time of rear collision of the vehicle. As a result, the elastic bonding portion 53 is suppressed from being completely broken and is not easily scattered. The adhesive 49 that bonds the inner panel 7, the outer upper panel 9a, the outer lower panel 9b, and the window panel 5 is also an elastic adhesive, and the portion where these panels 5, 7, 9b, 9a are bonded is also elastically bonded. Part 53 is formed. As the elastic adhesives 45 and 49, urethane adhesives can be employed.

  A rectangular reinforcing sheet-like object 55 is provided in the inner space S of the lower portion 3b of the door body 3 in a state where the long side is expanded in the same direction along the vehicle width direction. The reinforcing sheet-like material 55 is a net-like member made of a knotless network having a number of meshes 56 such as rectangles, rhombuses, and hexagons, and the meshes of the meshes 56 are about 1.0 mm to 20.0 mm. An appropriate size is selected according to the flowability of the elastic adhesive 45 used for bonding the reinforcing sheet 55 to the outer lower panel 9b and the adhesive holding strength after curing. The reinforcing sheet-like material 55 is formed by knitting a twisted yarn 55a made of a stretchable fiber such as polyester, polyethylene, rubber, or nylon, and has stretchability in multiple directions such as up, down, left, and right. The reinforcing sheet-like material 55 is disposed on substantially the entire lower portion 3b of the door body 3, that is, on the entire portion of the lower portion 3b that is closer to the center excluding the left and right side end portions. The edge is fastened to the door body and is stretched up and down.

  The upper and lower edges of the reinforcing sheet 55 are sandwiched between the inner panel 7 and the outer lower panel 9b at the upper and lower edges of the lower portion 3b with the elastic adhesive 45 and the door body. 3 are bonded to each other. Specifically, the upper edge portion of the reinforcing sheet-like material 55 is formed by the elastic adhesive portion 53 at the upper edge portion of the lower portion 3b, that is, the lower edge portion of the inner flange 21 of the inner panel 7 and the upper edge portion of the outer lower panel 9b. The door body 3 is bonded by an elastic bonding portion 53 formed by bonding. Further, the lower edge portion of the reinforcing sheet-like material 55 is formed by bonding the elastic bonding portion 53 at the lower edge portion of the lower portion 3b, that is, the lower edge portion of the outer flange 17 of the inner panel 7 and the lower edge portion of the outer lower panel 9b. It adheres to the door body 3 with an elastic bonding portion 53.

  The elastic adhesive 45 for adhering the upper and lower edges of the reinforcing sheet-like material 55 is attached to the inner panel 7 and encloses the edge of the reinforcing sheet-like material 55 from the inner panel 7 side. 56 is attached to the outer lower panel 9b. Thus, the twisted yarns 55 a constituting the upper and lower edges of the reinforcing sheet-like material 55 are embedded in the elastic adhesive 45. In this way, the upper and lower edges of the reinforcing sheet-like material 55, which is a net-like member, are bonded to the door body 3, so that the reinforcing sheet-like material 55 has no gaps or holes such as a mesh through which the adhesive passes. Or it is a knitted fabric, and the reinforcing sheet-like material for the door body 3 is compared with the case where the reinforcing sheet-like material 55 is bonded to the inner panel 7 or the outer lower panel 9b with an adhesive applied separately on both upper and lower edges. The adhesive strength of 55 can be increased. Moreover, as will be described in detail later, the bonding operation of the reinforcing sheet 55 to the door body 3 can be simplified by performing the adhesive application process once.

  The reinforcing sheet-like material 55 is also bonded to the receiving surface portions 39 of the side reinforcing ribs 29 with an elastic adhesive 58 such as a urethane-based adhesive. The elastic adhesive 58 for adhering the reinforcing sheet-like material 55 to the receiving surface portion 39 is attached to the receiving surface portion 39 and partially encloses the reinforcing sheet-like material 55 from the inner panel 7 side through the mesh 56 to the outer lower panel. It is attached to 9b. An opening 60 is formed in the central portion of the reinforcing sheet-like object 55 for passing wiring (not shown) for supplying power to the lamp for license plate illumination.

  Next, an assembling method of the back door 1 having the above configuration will be described with reference to FIGS. 5 (a) and 5 (b). FIG. 5A is a cross-sectional view showing the application process of the elastic adhesive 45. FIG. 5B is a cross-sectional view showing a joining process between the inner panel 7 and the outer lower panel 9b.

  In order to assemble the back door 1, first, the reinforcing sheet-like material 55 is placed on the surface of the outer lower panel 9b facing the inner panel 7, and the reinforcing sheet-like material 55 is positioned at a predetermined position on the outer lower panel 9b. Match. At this time, the upper edge portion of the reinforcing sheet-like material 55 is arranged at a portion to be bonded to the inner panel 7 at the upper edge portion of the outer lower panel 9b, and the lower edge portion of the reinforcing sheet-like material 55 is placed on the outer lower panel 9b. It arrange | positions to the adhesion plan part with the inner panel 7 in a lower edge part.

  Next, as shown in FIG. 5 (a), the elastic adhesive 45 is discharged from the nozzle 201 while scanning the nozzle 201 of the bonding apparatus on the portion to be bonded at the outer peripheral edge including the upper and lower edges of the outer lower panel 9b. By doing so, the elastic adhesive 45 is applied so as to cover the upper and lower edges of the reinforcing sheet-like material 55. In addition, an elastic adhesive 58 is applied to portions of the outer lower panel 9b corresponding to the side reinforcing ribs 29 so as to partially cover the reinforcing sheet 55.

  Subsequently, as shown in FIG. 5 (b), the lower half portion and the lower side portion on the left and right side portions of the outer flange 17 of the inner panel 7 and the lower side portion of the inner flange 21 are arranged outside the outer lower panel 9b. The outer lower panel 9b and the inner panel 7 are joined by pressing the peripheral edge portions with the pressing jig 203 via the elastic adhesive 45, respectively. At this time, the upper edge of the reinforcing sheet-like material 55 is between the upper edge of the outer lower panel 9 b and the lower edge of the inner flange 21 of the inner panel 7. The lower edge portion of the reinforcing sheet 55 is sandwiched between the lower side portion of the flange 17 together with the elastic adhesive 45. As a result, the elastic adhesive 45 is filled into the mesh 56 at both the upper and lower edges of the reinforcing sheet-like material 55 and spreads to the outer lower panel 9b through the mesh 56 to constitute the upper and lower edges of the reinforcing sheet-like material 55. The twisted yarn 55 a is embedded in the elastic adhesive 45.

  Further, the elastic adhesive 58 applied to the portion corresponding to each side reinforcing rib 29 in the outer lower panel 9b is also reinforced at the receiving surface portion 39 of the corresponding side reinforcing rib 29 when the outer lower panel 9b and the inner panel 7 are joined. The whole object 55 is pressed against the outer lower panel 9b. As a result, in the portions corresponding to the side reinforcing ribs 29 in the reinforcing sheet-like material 55, the twisted yarn 55a constituting the reinforcing sheet-like material 55 is elastically bonded in the same manner as the upper and lower edges of the reinforcing sheet-like material 55. Embedded in the agent 58. As a result, the reinforcing sheet-like material 55 is partially bonded to each side reinforcing rib 29 with the elastic adhesive 58.

  Further, an elastic adhesive 45 is applied to a portion to be bonded at the outer peripheral edge portion of the outer upper panel 9a, and thereafter, the upper end portion, the upper side portion, and the inner flange at the left and right side portions of the outer flange 17 of the inner panel 7. The outer upper panel 9a and the inner panel 7 are joined by pressing the upper side portion 21 to the outer peripheral edge portion of the outer upper panel 9a via the elastic adhesive 45, respectively.

  Thereafter, the stepped portions 41 and 43 of the outer upper panel 9a and the outer lower panel 9b joined to the inner panel 7 and the left and right side portions of the outer flange 17 of the inner panel 7 facing the window panel 5 are formed. Then, an elastic adhesive 49 is applied. Then, the window panel 5 is fitted between the step portions 41 and 43 and bonded to the outer upper panel 9a, the outer lower panel 9b, and the inner panel 7 via an elastic adhesive 49. Through the above operations, the back door 1 shown in FIG. 1 is assembled. Note that the bonding operation of the window panel 5 can be performed together with the bonding operation of the outer upper panel 9a, the outer lower panel 9b, and the inner panel 7 by previously applying the elastic adhesive 49 to the window panel 5 side. .

-Effect of the embodiment-
FIG. 6 is a cross-sectional view illustrating an example of the state of the portion corresponding to the lower portion 3 b at the time of a rear surface collision of the back door 1. In this embodiment, the reinforcing sheet-like material 55 is provided in the inner space S in the lower portion 3b of the door body 3 in a state where the reinforcing sheet-like material 55 is widened in the vehicle width direction. Are bonded to the door main body 3 by an elastic bonding portion 53 that is relatively strong and difficult to scatter during a rear-end collision of the vehicle, so that both panels 7 constituting the lower portion 3b of the door main body 3 as shown in FIG. 9b, that is, not only the inner panel 7 having high rigidity but also the outer lower panel 9b having high toughness is scattered, the reinforcing sheet-like material 55 is spread in the vehicle width direction and is extended in the vertical direction. It can remain in the part 3b. Since the reinforcing sheet-like material 55 has stretchability, even if the lower portion 3b of the door body 3 is greatly deformed, the reinforcement sheet-like material 55 is stretched according to the deformation, and can withstand an impact at the time of a rear-end collision of the vehicle. hard. Therefore, according to this embodiment, even if both panels 7 and 9b constituting the lower portion 3b of the door body 3 are scattered at the time of a rear-end collision of the vehicle, the portion corresponding to the lower portion 3b in the back door 1 Since the reinforcing sheet-like object 55 can be left, it is possible to prevent a large hole from being opened at the same location.

-Modification of the embodiment-
FIG. 7 is a cross-sectional view of the back door 1 corresponding to the lower portion of FIG. 4 according to this modification. In this modification, the elastic bonding portion 53 at the lower edge portion of the lower portion 3b of the door body 3 is bonded to the inner panel 7 and the outer lower panel 9b with only the elastic adhesive 45 interposed therebetween, as shown in FIG. An adhesive allowance 61 is provided.

  That is, the reinforcing sheet-like material 55 is partially disposed on the elastic bonding portion 53 at the lower edge portion of the lower portion 3b of the door body 3, and is not provided over the entirety. Specifically, although the lower edge portion of the reinforcing sheet-like material 55 is sandwiched with the elastic adhesive 45 between the inner space S side portion of the outer flange 17 of the inner panel 7 and the outer lower panel 9b, The reinforcing sheet-like material 55 is not sandwiched between the portion near the outer peripheral edge of the outer flange 17 and the outer lower panel 9b, and only the elastic adhesive 45 is sandwiched. Thus, the bonding margin 61 in which the inner panel 7 and the outer lower panel 9b do not sandwich the reinforcing sheet-like material 55 is provided at the portion of the elastic bonding portion 53 at the lower edge portion of the lower portion 3b located on the outer peripheral side of the door body 3. Is provided.

  According to such a configuration, the elastic bonding portion 53 at the lower edge portion of the lower portion 3b of the door body 3 is provided with the bonding allowance 61 that does not sandwich the reinforcing sheet-like material 55. Therefore, the inner panel 7 and the outer lower panel are provided. The lower edge portion of the reinforcing sheet 55 can be bonded to the door body 3 without impairing the sealing performance with the 9b, and the bonding strength between the inner panel 7 and the outer lower panel 9b can be increased.

  In the above modification, the elastic bonding portion 53 at the lower edge portion of the lower portion 3b of the door body 3 has the bonding margin 61. However, the elastic bonding portion 53 at the upper edge portion of the lower portion 3a is an inner portion. The panel 7 and the outer lower panel 9b may have a bonding margin in which only the elastic adhesive 45 is sandwiched and bonded. According to such a configuration, the elastic bonding portion 53 at the upper edge portion of the lower portion 3b of the door main body 3 has the upper edge portion of the reinforcing sheet-like material 55 without impairing the sealing performance between the inner panel 7 and the outer lower panel 9b. It can be bonded to the door body 3, and the bonding strength between the inner panel 7 and the outer lower panel 9b can be increased. Further, the elastic bonding portions 53 at both the upper and lower edges of the lower portion 3b of the door body 3 may have the bonding allowance.

  In the above embodiment, the reinforcing sheet-like material 55 is described as an example of a net-shaped member made of a knotless net formed in a rectangular shape, but the net-like shape constituting the reinforcing sheet-like material 55 is described. This member may consist of a knotted net. The reinforcing sheet-like material 55 may be a knitted or woven fabric made of stretchable fibers, and may be formed in other shapes such as a trapezoidal shape. As the reinforcing sheet-like material 55, it is desirable to have stretchability in multiple directions, but any material having stretchability in at least one direction can be employed.

  Moreover, in the said embodiment, when the adhesive agent 45 which adhere | attaches the upper and lower edges of the reinforcement sheet-like object 55 to the door main body 3, ie, the adhesive agent 45 which adhere | attaches the inner panel 7 and the outer lower panel 9b, is an elastic adhesive agent. However, the present invention is not limited to this, and the adhesive 45 may be an adhesive other than an elastic adhesive such as an epoxy adhesive. The same applies to the adhesive 45 for bonding the inner panel 7 and the outer upper panel 9a and the adhesive 49 for bonding the window panel 5 to these panels 7, 9a, 9b.

  Moreover, in the said embodiment, although the outer panel 9 illustrated the form comprised by the two division body of the outer upper panel 9a and the outer lower panel 9b, it is not limited to this, The outer panel 9 is a single piece. It may consist of panels. In this case, the outer panel 9 has, for example, a configuration in which a middle panel in which a window opening is formed between the outer upper panel 9a and the outer lower panel 9b is provided, and these three members are integrally molded. Manufactured.

  As described above, the present invention is useful for a vehicle back door. In particular, even when the inner panel and the outer panel constituting the lower portion of the door body are scattered at the time of a rear collision of the vehicle, the lower portion It is suitable for a vehicle back door that is required to prevent a large hole from opening at a corresponding location.

S Internal space 1 Back door 3 Door body 3a Upper part 3b Lower part 5 Window panel 6 Window part 7 Inner panel 9 Outer panel 9a Outer upper panel 9b Outer lower panel 13 Window opening 15 Outer standing wall 17 Outer flange 19 Inner standing wall 21 Inner flange 23 Hinge mounting portion 29 Side reinforcing rib 31 Filled hole 33 Fragile portion 35 End portion of side reinforcing rib 37 Vertical wall portion 39 Receiving surface portion 45, 49 Elastic adhesive 53 Elastic adhesive portion 55 Reinforcing sheet-like material 55a Twisted yarn 56 Mesh 58 Elastic adhesive 61 Adhesive allowance

Claims (3)

The door body (3) which has an inner space (S) between the two panels (7, 9), which are joined to the resin inner panel (7) and the resin outer panel (9) facing each other. A vehicle back door having a window (6) in the upper half of the door body (3),
The upper and lower edge portions of the lower portion (3b) located below the window portion (6) of the door body (3) are the inner panel (7) and the outer panel (9). Is the bonded part (53) bonded with the adhesive (45),
In the inner space (S) in the lower portion (3b) of the door body (3), a reinforcing sheet-like object (55) made of a stretchable fiber is provided in a state of being expanded in the vehicle width direction,
The upper and lower edge portions of the reinforcing sheet-like object (55) are sandwiched together with the adhesive (45) between the inner panel (7) and the outer panel (9) at the adhesive portion (53). A vehicular back door that is bonded to the door body (3). In the vehicle back door according to claim 1,
The reinforcing sheet-like material (55) is a net-like member having a large number of meshes (56),
An adhesive (45) for bonding the upper and lower edges of the reinforcing sheet-like material (55) is attached to one of the inner panel (7) and the outer panel (9) and A vehicular back door characterized in that the edge of the reinforcing sheet-like object (55) is wrapped from the panel side of the panel and attached to the other panel through the mesh (56). In the vehicle back door according to claim 1 or 2,
The inner panel (7) and the outer panel (9) have an adhesive portion (53) at least one of the upper edge portion and the lower edge portion of the lower portion (3b) of the door body (3). A vehicular back door characterized by having an adhesive margin (61) bonded by sandwiching only the adhesive (45).

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