JP6903845B2 - Vehicle backdoor inner panel - Google Patents

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 the manufacturing cost, a back door made of synthetic resin is known instead of the conventional sheet metal. A backdoor made of synthetic resin is lighter than a backdoor made of sheet metal, but has low rigidity and is easily deformed. The synthetic resin back door has an inner panel located at the front of the vehicle and an outer panel located at the rear 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 hem of the inner panel of the back door has a pair of connecting portions located on the left and right sides of the upper end thereof. A damper stay is attached to each connecting portion. Further, the hem portion is provided with a pair of left and right concave grooves (beads) extending diagonally upward from the left and right sides of the latch mounting portion to reach the pair of connecting portions. The pair of recesses form a skeletal structure with relatively high rigidity at the hem. When the back door is closed, the restoring force of the damper stay always acts on the pair of connecting parts, and the back door is supported by the latch mounting part, so it bends toward the rear of the vehicle with the latch mounting part as the fulcrum. Deformation mode occurs in the back door. Therefore, the pair of concave grooves suppresses the amount of deformation of the back door due to the deformation mode, and the NV (Noise and Vibration) performance of the vehicle is ensured.

Further, the outer panel of the back door is joined by being abutted against the inner peripheral flange and the 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 large and a license plate is attached to the outer panel, so that the outer panel is joined to the center of the hem of the inner panel. It is necessary to provide an adhesive area for this. 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 a decrease in rigidity of the hem of the inner panel becomes a problem.

JP-A-2017-132347

In view of the above circumstances, the present invention provides a vehicle backdoor inner panel capable of ensuring the rigidity of the hem of the inner panel even when the backdoor is enlarged. Make it an issue.

According to the present invention, an opening provided with a back window, an upper side portion of the opening located above the opening and extending in the vehicle width direction, and a latch located below the opening and below the vehicle. A hem portion having a mounting portion at the center of the lower end, and a pair of side portions that are located on the left and right sides of the opening and extend in the vertical direction of the vehicle and connect the upper side portion of the opening and the hem portion. A back door inner panel for a vehicle made of synthetic resin, the hem portion is located on both left and right sides of the upper end of the hem portion, and a pair of connecting portions connecting the lower ends of the side portions and the latch. Each of the recessed grooves has a pair of recesses extending diagonally upward from the left and right sides of the mounting portion in the vehicle width direction to reach the pair of the connecting portions, and an adhesive region that crosses the recessed grooves. It has a bottom portion facing the front-rear direction of the vehicle and a pair of side wall portions standing up from the bottom portion toward the rear of the vehicle, and the adhesive region is located behind the bottom portion of the vehicle and faces the front-rear direction of the vehicle. It has a shelf portion and a partition wall portion that stands up from the shelf portion toward the front of the vehicle and the pair of the side wall portions intersect with each other, and the recessed groove stands up from the bottom portion toward the rear of the vehicle. A rib that rises from the shelf portion toward the front of the vehicle is provided between the pair of the side wall portions, and the ribs intersect the partition wall portion and extend along the concave groove. A back door inner panel for vehicles is provided.

In the vehicle back door inner panel according to the present invention, the recessed groove has ribs that stand up from the bottom toward the rear of the vehicle and from the shelf in the adhesive region toward the front of the vehicle between the pair of side walls. It is provided in. The rib intersects the partition wall of the adhesive region and extends along the groove. By adopting such a configuration, even when the adhesive region crosses the concave groove and the bottom is divided due to the increase in size of the back door, the rib can maintain the skeletal structure in which the concave groove is continuous. .. Therefore, the decrease in the rigidity of the concave groove is avoided. Therefore, according to the vehicle back door inner panel according to the present invention, it is possible to secure the rigidity of the hem even when the back door is enlarged.

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

It is a front view (the view seen from the rear of a vehicle) of the back door inner panel for a vehicle which concerns on one Embodiment of this invention. It is a partially enlarged view of FIG. 1 (near the concave groove that the adhesive region crosses). It is a partial back view (near the concave groove which the adhesive region crosses) of the inner panel shown in FIG. 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.

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

A vehicle backdoor inner panel (hereinafter referred to as “inner panel A10”) according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. Of these, FIG. 5 is a cross-sectional view along the alternate long and short dash line shown in FIG.

Here, for convenience of explanation, up in each figure is the vehicle upward direction, dw is the vehicle downward direction, fr is the vehicle front direction, rr is the vehicle rear direction, rh is the vehicle right direction, and lh is the vehicle left direction. In the following description, when using up and down without special mention, it means up and down in the vehicle up and down direction, and when using left and right without special mention, it means left and right in the vehicle left and right direction (vehicle width direction). When the front and rear are used without special mention, it means the front and rear in the front and rear direction of the vehicle.

The vehicle back door (hereinafter, simply referred to as “back door”) is arranged 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. The back door is configured by joining the outer panel to the inner panel A10 and joining the 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 fiber (GF). The inner panel A10 is integrally molded by injection molding. In the present embodiment, the thickness of the inner panel A10 is 2.2 mm.

As shown in FIG. 1, the inner panel A10 includes an opening 10, an opening upper side portion 20, a hem portion 30, and a pair of side portions 40.

As shown in FIG. 1, the opening 10 is an opening region surrounded by an opening upper side portion 20, a hem portion 30, and a 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 edges of the opening upper side portion 20, the hem portion 30, and the pair of side portions 40 adjacent to the opening 10 project toward the opening 10 in the vehicle vertical direction and the vehicle width direction. The flange 51 is formed. The inner peripheral flange 51 surrounds the opening 10. Further, as shown in FIG. 1, an outer peripheral flange 52 is formed on the outer edges of the hem portion 30 and the pair of side portions 40 so as to project outward of the inner panel A10 in the vehicle width direction and below the vehicle. The outer panel is joined to the inner panel A10 by abutting the outer panel against the rear surface (the surface facing the rear of the vehicle) of the inner peripheral flange 51 and the outer peripheral flange 52. For joining, for example, a polyurethane adhesive is used.

As shown in FIG. 1, the opening upper side portion 20 is located above the opening 10 and extends in the vehicle width direction. The upper side portion 20 of the opening constitutes a beam structure in the inner panel A10. A pair of door hinge mounting portions 21 are 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 both left and right ends of the opening upper side portion 20. A door hinge (not shown) is attached to each door hinge mounting portion 21 from the front of the vehicle, and a steel door hinge reinforcing material (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. Therefore, the back door can be rotated around the upper edge of the rear opening of the vehicle by the door hinge. The rotation opens and closes the back door.

As shown in FIG. 1, the hem portion 30 is located below the opening 10 of the vehicle. The hem portion 30 constitutes a plate structure in the inner panel A10. The hem portion 30 has 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 lower side portion 31 of the opening is located at the upper end of the hem portion 30 and extends in the vehicle width direction. A peripheral groove 36 that opens toward the rear of the vehicle is formed in the lower side portion 31 of the opening. The peripheral groove 36 has a bottom surface 361 facing the rear of the vehicle. The bottom surface 361 is arranged along the vehicle vertical direction and the vehicle width direction.

As shown in FIG. 1, the pair of connecting portions 32 are located on the left and right sides of the lower side portion 31 of the opening, and the pair of side portions 40 are connected to each other. 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 peripheral groove 36 that opens toward the rear of the vehicle. Each connecting portion 32 has a bottom surface 361 and a door stay mounting 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. Further, a door stay reinforcing material (not shown) covering 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 the left and right ends of the hem portion 30 and is connected to a pair of connecting portions 32. The frame portion 33 is formed with a peripheral groove 36 that opens toward the rear of the vehicle. A latch mounting portion 331 is provided at the center of the lower end of the frame portion 33. The back door is closed by the back door when the latch (not shown) attached to the latch mounting portion 331 engages with the striker (not shown) provided at the lower edge of the rear opening of the vehicle. The state of being held is maintained.

As shown in FIG. 1, the peripheral groove 36 is formed in a frame shape (square 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 extend diagonally upward from both the left and right sides of the latch mounting portion 331 in the vehicle width direction to reach the pair of connecting portions 32. An adhesive region 35 (first region 35A, which will be described later) crosses the groove 34. In this embodiment, the adhesive region 35 crosses both of the pair of recessed grooves 34. As shown in FIGS. 2 to 5, each recess 34 has a bottom portion 341 and a pair of side wall portions 342.

As shown in FIGS. 2 to 6, the bottom portion 341 faces the vehicle front-rear direction. Further, as shown in FIGS. 2 to 5, each of the pair of side wall portions 342 stands up 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 concave groove 34 extends. Therefore, the cross section of the concave groove 34 has a groove shape (U-shape). As shown in FIGS. 3, 5 and 6, the bottom portion 341 is divided at a portion where the adhesive region 35 crosses. On the other hand, the pair of side wall portions 342 are not divided at the points where the adhesive region 35 crosses, and have a continuous configuration from the latch mounting portion 331 to the respective connecting portions 32.

As shown in FIG. 1, the adhesive region 35 is located in the region surrounded by the peripheral groove 36 in the hem portion 30. The bonding region 35, together with the inner peripheral flange 51 and the outer peripheral flange 52, is a portion for joining the outer panel to the inner panel A10. In the present embodiment, the adhesive region 35 viewed from the rear of the vehicle is strip-shaped. The adhesive 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 hem 30 so as to extend in the vehicle width direction. The first region 35A crosses the concave groove 34. The second region 35B is located below the first region 35A. The second region 35B surrounds the region of the hem 30 located below the region surrounded by the first region 35A, together with a part of the first region 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 adhesive 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 behind the vehicle bottom portion 341 of the concave groove 34 and the bottom surface 361 of the peripheral groove 36, and faces the vehicle front-rear direction. Therefore, the shelf portion 351 is parallel to the bottom portion 341. The shelf portion 351 has an adhesive surface 351A facing the rear of the vehicle and a back surface 351B facing the front of the vehicle. When the outer panel is joined to the inner panel A10, an adhesive (for example, a polyurethane adhesive) is applied to the adhesive surface 351A. Therefore, when the outer panel is joined to the inner panel A10, the adhesive region 35 comes into contact with the outer panel via the adhesive. Further, as shown in FIGS. 4 to 6, the partition wall portion 352 stands up from the back surface 351B 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 adhesive region 35 extends. A pair of side wall portions 342 of the concave groove 34 intersect with the partition wall portion 352 of the first region 35A of the adhesive region 35.

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

As shown in FIG. 1, the pair of side portions 40 are located on the left and right sides of the opening 10 and extend in the vertical direction of the vehicle. The pair of side portions 40 form a pillar structure in the inner panel A10. The pair of side portions 40 connect the left and right ends of the opening upper side portion 20 and the pair of connecting portions 32 (hem portion 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 action and effect of the inner panel A10 will be described.

In the concave groove 34 of the inner panel A10, ribs 37 that stand up from the bottom portion 341 toward the rear of the vehicle and stand up from the shelf portion 351 of the adhesive region 35 (first region 35A) are provided between the pair of side wall portions 342. Has been done. The rib 37 intersects the partition wall portion 352 of the bonding region 35 (first region 35A) and extends along the concave groove 34. By adopting such a configuration, the skeleton in which the concave groove 34 is continuous by the rib 37 even when the adhesive region 35 crosses the concave groove 34 and the bottom portion 341 is divided due to the increase in size of the back door. Can hold the structure. Therefore, the decrease in the rigidity of the concave groove 34 is avoided. Therefore, according to the inner panel A10, it is possible to secure the rigidity of the hem portion 30 even when the size of the back door is increased.

The present invention is not limited to the embodiments described above. The specific configuration of each part of the present invention can be freely redesigned.

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

Claims (1)

An opening with a back window and
The upper side of the opening, which is located above the vehicle and extends in the width direction of the vehicle,
A hem that is located below the vehicle and has a latch mounting portion in the center of the lower end.
A backdoor inner panel for a vehicle made of synthetic resin, which is located on both the left and right sides of the opening, extends in the vertical direction of the vehicle, and has a pair of side portions for connecting the upper side portion of the opening and the hem portion. hand,
The hem portion is located on both the left and right sides of the upper end of the hem portion, and has a pair of connecting portions connecting the lower ends of the pair of the side portions and diagonally upward from the left and right sides of the latch mounting portion in the vehicle width direction. It has a pair of recesses extending to reach the connecting portion and an adhesive region that traverses the recesses.
Each of the concave grooves has a bottom portion facing in the front-rear direction of the vehicle and a pair of side wall portions standing up from the bottom portion toward the rear of the vehicle.
The adhesive region includes a shelf portion that is located behind the vehicle and faces the vehicle front-rear direction from the bottom portion, and a partition wall portion that stands up from the shelf portion toward the front of the vehicle and intersects the pair of the side wall portions. Have,
The recess is provided with ribs that stand up from the bottom toward the rear of the vehicle and from the shelves toward the front of the vehicle between the pair of side walls.
A vehicle backdoor inner panel, characterized in that the ribs intersect the partition wall and extend along the recess.

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