JP2019055677A - Vehicle back door inner panel - Google Patents

Abstract

To provide a vehicle back door inner panel which can secure rigidity of a skirt part of an inner panel even if a back door is enlarged.SOLUTION: A synthetic resin made inner panel A10 includes an opening 10, an opening upper side part 20, a skirt part 30, and a pair of side parts 40. The skirt part 30 has a pair of connection parts 32, a pair of recessed grooves 34, and an adhesion area 35. Each recessed groove 34 has a bottom part 341 and a pair of side wall parts 342 standing from the bottom part 341 to the vehicle rear side. The adhesion area 35 has a shelf part 351 located at the vehicle rear side relative to the bottom part 341 and a partition wall part 352 which stands from the shelf part 351 to the vehicle front side and with which the pair of side wall parts 342 intersects. In the recessed groove 34, a rib 37 which stands from the bottom part 341 to the vehicle rear side and stands from the shelf part 351 to the vehicle front side is provided between the pair of side wall parts 342. The rib 37 intersects with the partition wall part 352 and extends along the recessed groove 34.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an inner panel made of synthetic resin that constitutes a vehicle back door.

  In order to reduce the weight of the vehicle and reduce the manufacturing cost, a synthetic resin back door is known instead of the conventional sheet metal. A synthetic resin back door is lighter than a sheet metal back door, but has a characteristic of low rigidity and easy deformation. The back door made of synthetic resin has a configuration in which an outer panel positioned at the rear of the vehicle is joined to an inner panel positioned at the front of the vehicle. Of these, the inner panel is a member responsible for the strength and rigidity of the back door.

  Patent Document 1 discloses an example of a back door made of synthetic resin. The bottom part of the inner panel of the back door has a pair of connecting parts located on the left and right sides of the upper end. A damper stay is attached to each connecting portion. Further, the skirt is provided with a pair of left and right concave grooves (beads) extending obliquely upward from the left and right sides of the latch mounting portion to reach a pair of connecting portions. The pair of concave grooves constitutes a skeleton structure having relatively high rigidity at the skirt. When the back door is closed, the restoring force of the damper stage always acts on the pair of connecting parts, and the back door is supported at the latch mounting part, so it curves toward the rear of the vehicle with the latch mounting part as a fulcrum. A deformation mode is generated at the back door. Therefore, the pair of concave grooves suppresses the deformation amount of the back door in the deformation mode, and ensures the NV (Noise and Vibration) performance of the vehicle.

  Further, the outer panel of the back door is joined by being abutted against an inner peripheral flange and an outer peripheral flange provided on the inner panel. Here, if the back door is applied to a vehicle with a relatively high vehicle height, such as a wagon car, the back door becomes larger and a license plate is attached to the outer panel, so the outer panel is joined to the center of the bottom of the inner panel. It is necessary to provide an adhesive region for this purpose. When the size of the back door is increased, the adhesive region may cross the concave groove, and the concave groove may be divided due to the influence of the molding of the inner panel. In such a configuration, the concave groove has a discontinuous structure, and the lowering of the rigidity of the hem portion of the inner panel becomes a problem.

JP 2017-132347 A

  In view of the above circumstances, the present invention provides a vehicular back door inner panel capable of ensuring the rigidity of the bottom of the inner panel even when the back door is enlarged. Let it be an issue.

  According to the present invention, the opening provided with the back window, the opening upper side located above the opening and extending in the vehicle width direction, the vehicle lower side than the opening, and the latch A skirt provided with a mounting portion at the center of the lower end, and a pair of side portions that are positioned on both left and right sides of the opening and that extend in the vehicle vertical direction and connect the upper side of the opening and the skirt. A back door inner panel for a vehicle made of synthetic resin, wherein the skirt is located on both left and right sides of the upper end of the skirt, and a pair of connecting portions connected to the lower ends of the pair of side portions; and the latch A pair of concave grooves extending diagonally upward in the vehicle width direction from the left and right sides of the mounting portion and reaching the pair of connecting portions; and an adhesive region crossing the concave grooves, each of the concave grooves The bottom facing the vehicle longitudinal direction, and the bottom A pair of side walls standing up toward both rear sides, and the adhesive region is located on the rear side of the vehicle with respect to the bottom, and faces in the vehicle front-rear direction, and from the shelf toward the front of the vehicle. And a partition wall portion where the pair of side wall portions intersect, and the recessed groove rises from the bottom portion toward the rear of the vehicle and rises from the shelf portion toward the front of the vehicle. A vehicular back door inner panel is provided, wherein a rib is provided between the pair of side wall portions, and the rib intersects the partition wall portion and extends along the concave groove.

  In the vehicle back door inner panel according to the present invention, a rib that rises toward the rear of the vehicle from the bottom and rises toward the front of the vehicle from the shelf in the adhesion region is formed between the pair of side wall portions in the groove. Is provided. The rib intersects the partition wall portion of the adhesion region and extends along the concave groove. By adopting such a configuration, with the increase in the size of the back door, even when the adhesive region crosses the groove and the bottom is divided, the skeleton structure in which the groove is continuous can be maintained by the rib. . For this reason, the rigidity fall of a ditch | groove is avoided. Therefore, according to the vehicle back door inner panel according to the present invention, it is possible to ensure the rigidity of the skirt even when the back door is enlarged.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a front view (figure seen from the vehicles back) of the back door inner panel for vehicles concerning one embodiment of the present invention. It is the elements on larger scale of FIG. 1 (near the ditch | groove which an adhesion | attachment area | region traverses). FIG. 2 is an enlarged partial rear view of the inner panel shown in FIG. 1 (in the vicinity of a groove where the bonding region crosses). It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which follows the VI-VI line of FIG.

  A mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described with reference to the accompanying drawings.

  Based on FIGS. 1-6, the back door inner panel (henceforth "inner panel A10") for vehicles concerning one Embodiment of this invention is demonstrated. Among these, FIG. 5 is a cross-sectional view along the one-dot chain line shown in FIG.

  Here, for convenience of explanation, upr shown in each figure is the vehicle upward direction, dw is the vehicle downward direction, fr is the vehicle forward direction, rr is the vehicle rearward direction, rh is the vehicle rightward direction, and lh is the vehicle leftward direction. In addition, in the following description, when using up and down without special mention, it shall point up and down in the vehicle up-and-down direction, and when using left and right without special mention, it shall mean the left and right of the vehicle left-right direction (vehicle width direction). Moreover, when using front and back without special mention, it points to the front and rear of a vehicle front-back direction.

  A vehicle back door (hereinafter simply referred to as a “back door”) is disposed so as to close the rear opening of the vehicle, and includes an inner panel A10 and an outer panel (not shown) as components. The inner panel A10 is located in front of the vehicle and inside the vehicle, and the outer panel is located behind the vehicle and outside the vehicle. Both the inner panel A10 and the outer panel are made of synthetic resin. A back door is configured by joining an outer panel to the inner panel A10 and joining a back window (not shown) to the outer panel from the rear of the vehicle. The composition of the inner panel A10 is, for example, polypropylene (PP) containing glass fibers (GF). The inner panel A10 is integrally formed by injection molding. In the present embodiment, the inner panel A10 has a thickness of 2.2 mm.

  As shown in FIG. 1, the inner panel A <b> 10 includes an opening 10, an opening upper side 20, a skirt 30, and a pair of side portions 40.

  As shown in FIG. 1, the opening 10 is an opening region surrounded by the opening upper side portion 20, the skirt portion 30, and the pair of side portions 40. When the back door is configured, the opening 10 is provided with a back window (not shown) that closes the opening 10 from the rear of the vehicle.

  As shown in FIG. 1, the inner periphery of the upper edge 20 of the opening adjacent to the opening 10, the bottom 30, and the inner edges of the pair of side portions 40 protrudes toward the opening 10 in the vehicle vertical direction and the vehicle width direction A flange 51 is formed. The inner peripheral flange 51 surrounds the opening 10. As shown in FIG. 1, an outer peripheral flange 52 that protrudes toward the outside of the inner panel A10 in the vehicle width direction and the vehicle lower side is formed on the outer edges of the skirt portion 30 and the pair of side portions 40. The outer panel is joined to the inner panel A10 by abutting the outer panel against the rear surfaces of the inner peripheral flange 51 and the outer peripheral flange 52 (the surface facing the rear of the vehicle). For joining, for example, a polyurethane adhesive is used.

  As shown in FIG. 1, the opening upper side 20 is positioned above the opening 10 and extends in the vehicle width direction. The opening upper side 20 forms a beam structure in the inner panel A10. A pair of door hinge attachment portions 21 is provided on the upper side portion 20 of the opening.

  As shown in FIG. 1, the pair of door hinge mounting portions 21 are located at the left and right ends of the opening upper side portion 20. A door hinge (not shown) is attached to each door hinge attachment portion 21 from the front of the vehicle, and a steel door hinge reinforcement (not shown) is attached from the rear of the vehicle. The back door is connected to the upper edge of the rear opening of the vehicle via a pair of left and right door hinges. For this reason, the back door can be rotated around the upper edge of the rear opening of the vehicle by the door hinge. The back door is opened and closed by the rotation.

  As shown in FIG. 1, the skirt 30 is located below the opening 10 than the opening 10. The skirt 30 forms a plate structure in the inner panel A10. The skirt portion 30 includes an opening lower side portion 31, a pair of connecting portions 32, a frame portion 33, a pair of concave grooves 34, and an adhesive region 35.

  As shown in FIG. 1, the opening lower side portion 31 is located at the upper end of the skirt portion 30 and extends in the vehicle width direction. A circumferential groove 36 that opens toward the rear of the vehicle is formed in the opening lower side 31. The circumferential groove 36 has a bottom surface 361 that faces the rear of the vehicle. The bottom surface 361 is disposed along the vehicle vertical direction and the vehicle width direction.

  As shown in FIG. 1, the pair of connecting portions 32 are located on both the left and right sides of the opening lower side portion 31, and the pair of side portions 40 are connected. The cross-sectional shape of the connecting portion 32 including the inner peripheral flange 51 and the outer peripheral flange 52 is a hat shape that opens toward the rear of the vehicle. Based on such a hat-shaped cross section, the connecting portion 32 is formed with a circumferential groove 36 that opens toward the rear of the vehicle. Each connecting portion 32 has a bottom surface 361 and a door stay attaching portion 321. The bottom surface 361 is a surface facing the rear of the vehicle. The door stay mounting portion 321 bulges from the bottom surface 361 toward the rear of the vehicle. A damper stay (not shown) is attached to the door stay attachment portion 321 from the front of the vehicle. A door stay reinforcement (not shown) that covers the door stay mounting portion 321 is attached to each connecting portion 32 from the rear of the vehicle.

  As shown in FIG. 1, the frame portion 33 is located at the lower end and both left and right ends of the skirt portion 30 and is connected to the pair of connecting portions 32. A circumferential groove 36 that opens toward the rear of the vehicle is formed in the frame portion 33. A latch mounting portion 331 is provided at the center of the lower end of the frame portion 33. In the back door, a latch (not shown) attached to the latch attachment portion 331 engages with a striker (not shown) provided at the lower edge of the rear opening of the vehicle, so that the rear opening of the vehicle is closed by the back door. The held state is maintained.

  As shown in FIG. 1, the circumferential groove 36 is formed in a frame shape (b-shape) when viewed from the rear of the vehicle in the opening lower side portion 31, the pair of connecting portions 32 and the frame portion 33.

  As shown in FIG. 1, the pair of concave grooves 34 extends obliquely upward from the left and right sides of the latch mounting portion 331 with respect to the vehicle width direction and reaches the pair of connecting portions 32. An adhesive region 35 (a first region 35A described later) crosses the concave groove 34. In the present embodiment, the adhesion region 35 crosses both the pair of concave grooves 34. As shown in FIGS. 2 to 5, each concave groove 34 has a bottom portion 341 and a pair of side wall portions 342.

  As shown in FIGS. 2-6, the bottom part 341 faces the vehicle front-back direction. As shown in FIGS. 2 to 5, each of the pair of side wall portions 342 stands from the bottom portion 341 toward the rear of the vehicle and is connected to both sides of the bottom portion 341 in the direction in which the groove 34 extends. For this reason, the cross section of the concave groove 34 has a groove shape (U shape). As shown in FIGS. 3, 5, and 6, the bottom 341 is divided at a location where the bonding region 35 crosses. On the other hand, the pair of side wall portions 342 is not divided at the location where the bonding region 35 crosses, and is continuous from the latch mounting portion 331 to each connecting portion 32.

  As shown in FIG. 1, the adhesion region 35 is located in a region surrounded by the circumferential groove 36 in the skirt 30. The adhesion region 35 is a portion for joining the outer panel to the inner panel A10 together with the inner peripheral flange 51 and the outer peripheral flange 52. In the present embodiment, the adhesion region 35 viewed from the rear of the vehicle has a band shape. The adhesion region 35 includes a first region 35A and a second region 35B. The first region 35A surrounds a region located at the center of the skirt 30 so as to extend in the vehicle width direction. The first region 35 </ b> A crosses the concave groove 34. The second area 35B is located below the first area 35A. The second area 35B surrounds the area of the skirt 30 located below the area surrounded by the first area 35A, together with a partial section of the first area 35A. A license plate (not shown) is attached to the area of the outer panel corresponding to the area surrounded by the second area 35B. As shown in FIGS. 2 to 6, the adhesion region 35 has a shelf portion 351 and a partition wall portion 352.

  As shown in FIGS. 4 to 6, the shelf portion 351 is located on the vehicle rear side with respect to the bottom portion 341 of the concave groove 34 and the bottom surface 361 of the circumferential groove 36 and faces in the vehicle front-rear direction. For this reason, the shelf 351 is parallel to the bottom 341. The shelf 351 has an adhesive surface 351A that faces the rear of the vehicle and a back surface 351B that faces the front of the vehicle. When the outer panel is joined to the inner panel A10, an adhesive (for example, polyurethane adhesive) is applied to the adhesive surface 351A. For this reason, when an outer panel is joined to inner panel A10, adhesion field 35 contacts an outer panel via the adhesive. As shown in FIGS. 4 to 6, the partition wall portion 352 stands from the back surface 351 </ b> B of the shelf portion 351 toward the front of the vehicle. In the present embodiment, as shown in FIGS. 2 to 6 (excluding FIG. 4), the partition wall portion 352 has a pair of regions connected to both sides of the shelf portion 351 in the direction in which the adhesion region 35 extends. A pair of side wall portions 342 of the groove 34 intersects the partition wall portion 352 of the first region 35 </ b> A in the adhesion region 35.

  As shown in FIGS. 1 to 6, a rib 37 is provided between the pair of side wall portions 342 in the concave groove 34. The rib 37 stands from the bottom 341 of the concave groove 34 toward the rear of the vehicle, and rises toward the front of the vehicle from the back surface 351B of the shelf 351 of the adhesion region 35 (first region 35A). Further, the rib 37 intersects the partition wall portion 352 of the adhesion region 35 (first region 35A) and extends along the concave groove 34. For this reason, the rib 37 is not divided into the adhesion region 35 and has a continuous configuration.

  As shown in FIG. 1, the pair of side portions 40 is located on both the left and right sides of the opening 10 and extends in the vehicle vertical direction. The pair of side portions 40 constitutes a pillar structure in the inner panel A10. The pair of side portions 40 connects the left and right ends of the upper side portion 20 of the opening and the pair of connecting portions 32 (the skirt portions 30). The cross-sectional shape of each side portion 40 including the inner peripheral flange 51 and the outer peripheral flange 52 is a hat shape that opens toward the rear of the vehicle.

  Next, the function and effect of the inner panel A10 will be described.

  In the recessed groove 34 of the inner panel A10, a rib 37 is provided between the pair of side wall portions 342 that rises from the bottom portion 341 toward the rear of the vehicle and rises from the shelf portion 351 of the adhesion region 35 (first region 35A). It has been. The rib 37 intersects the partition wall portion 352 of the adhesion region 35 (first region 35A) and extends along the concave groove 34. By adopting such a configuration, with the increase in the size of the back door, even when the adhesive region 35 crosses the concave groove 34 and the bottom 341 is divided, the skeleton in which the concave groove 34 is continuous by the rib 37 is obtained. Can hold the structure. For this reason, the rigidity reduction of the concave groove 34 is avoided. Therefore, according to the inner panel A10, it is possible to ensure the rigidity of the skirt 30 even when the back door is enlarged.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the present invention can be changed in various ways.

A10: Inner panel 10: Opening portion 20: Opening upper side portion 21: Door hinge mounting portion 30: Bottom portion 31: Opening lower side portion 32: Connection portion 321: Door stay mounting portion 33: Frame portion 331: Latch mounting portion 34: Concave groove 341 : Bottom part 342: Side wall part 35: Adhesive area 35A: First area 35B: Second area 351: Shelf part 351A: Adhesive surface 351B: Back face 352: Partition part 36: Circumferential groove 361: Bottom face 37: Rib 40: Side part 51 : Inner flange 52: Outer flange

Claims (1)

An opening in which a back window is provided;
An opening upper side located above the opening and extending in the vehicle width direction; and
A skirt that is located below the vehicle from the opening, and a latch mounting portion is provided at the center of the lower end;
A back door inner panel for a vehicle made of synthetic resin, which is positioned on both left and right sides of the opening and extends in the vehicle vertical direction and includes a pair of side portions that connect the upper side of the opening and the skirt. And
The skirt is located on the left and right sides of the upper end of the skirt, and a pair of connecting portions to which the lower ends of the pair of side portions are connected. A pair of concave grooves extending to the pair of connecting portions, and an adhesive region crossing the concave grooves,
Each of the concave grooves has a bottom portion facing in the vehicle front-rear direction, and a pair of side wall portions standing from the bottom portion toward the rear of the vehicle,
The adhesion region is located on the rear side of the vehicle with respect to the bottom, and faces a vehicle front-rear direction, and a partition wall that rises from the shelf toward the front of the vehicle and intersects with the pair of side walls, Have
The concave groove is provided between the pair of side wall portions with a rib that rises toward the rear of the vehicle from the bottom and rises toward the front of the vehicle from the shelf.
The back door inner panel for a vehicle, wherein the rib intersects the partition wall and extends along the concave groove.

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