JP6495417B2 - Resin back door reinforcement structure - Google Patents

Description

  The present invention relates to a reinforcing structure for a resin back door.

  In recent years, the back door may be made of resin for the purpose of reducing the weight of the vehicle. The back door made of resin, like the back door made of sheet metal, extends along the upper edge of the vehicle body rearward opening along the upper edge of the rear opening of the vehicle body, along the left and right side edges of the rear opening of the vehicle body from both ends of the upper portion of the back door. A pair of left and right back door sides that extend in the vertical direction and a back door skirt that is connected to the lower side of the pair of left and right back doors and closes the lower part of the rear opening of the vehicle body. Glass is provided in a portion surrounded by the upper edge of the back door, the pair of left and right back doors, and the upper edge of the back door hem, thereby forming a rear window.

  When the back door is made of resin, it is necessary to pay attention to ensuring its rigidity. If the back door is not sufficiently rigid, the resonance frequency will be low, causing vibrations from the road surface and resonance with the CVT (continuously variable transmission) frequency, which may cause unpleasant noise. is there.

  The upper part of the back door is pivotably connected to the vehicle body via a pair of left and right hinges, and the lower center of the back door hem is linked to the vehicle body via a lock mechanism. That is, it can be considered that the back door is simply supported by the vehicle body at three points: a pair of left and right hinges at the upper part and a lock mechanism at the lower part in the closed state.

  By the way, in the back door, when a bending force is applied along the vertical direction, the pair of left and right back door side parts farthest from both the upper hinge and the lower locking mechanism, and the back door hem part. In order to increase the rigidity of the back door as a whole, it is considered that stress is concentrated near the connecting part. To increase the rigidity of the entire back door, increasing the rigidity of the connecting part between the pair of left and right back door sides and the back door hem part effectively contributes. I know that

  In Patent Document 1, by adopting a method of incorporating a relatively large reinforcement extending from a pair of left and right back door sides to a back door hem between the back door inner and the back door outer, The rigidity of the region from the pair of left and right back door sides to the back door hem is improved.

  However, the method of adopting such a large reinforcement and improving the rigidity of the resin back door still has the problem of increasing the number of parts and the number of assembly steps of the back door.

JP 2011-194947 A

  The present invention has been conceived under the circumstances described above, and has a resin back door reinforcement structure that effectively improves rigidity without increasing the number of parts or the number of assembly steps. The issue is to provide.

  In order to solve the above problems, the present invention employs the following technical means.

  The resin back door reinforcing structure provided by the present invention includes: a window portion provided with a window glass; an upper portion of a back door positioned above the window portion and extending in the vehicle width direction; and the window portion. And a pair of back door side portions that are located on the left and right sides of the window portion and extend in the vehicle vertical direction and connect the upper portion of the back door and the back door hem portion. A back door inner panel having a back door inner panel, wherein the back door hem has an annular bulge located on the outer periphery thereof and a recess located on the inner side of the annular bulge. The annular bulging portion is bulged toward the front of the vehicle, and the pair of back door side portions are connected, and the concave portion is recessed toward the rear of the vehicle. It is characterized in that it is Sera.

  According to the reinforcing structure of the back door having the above-described configuration, the back door skirt has an annular bulging portion positioned on the outer periphery thereof and a recessed portion positioned inside the annular bulging portion. The annular bulging portion is bulged toward the front of the vehicle, while the recessed portion is recessed toward the rear of the vehicle. For this reason, the rigidity of a back door skirt part can be improved.

  Further, the reaction force acting on the lock mechanism mounting portion when the back door is opened and closed is transmitted from the annular bulge portion to the pair of back door side portions. For this reason, the concentration of reaction force acting on the back door hem can be reduced, and deformation of the back door skirt can be suppressed.

  As a result, the rigidity of the resin back door can be effectively increased without requiring a separate reinforcement, and the resonance frequency of the entire back door is increased, resulting from vibration from the road surface or vibration due to CVT. Generation of a booming noise can be suppressed as much as possible.

  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 the perspective view which looked at the back door inner panel concerning one Embodiment of this invention from the back side. It is an expanded sectional view which follows the II-II line of FIG. It is the perspective view which looked at the back door inner panel shown in FIG. 1 from the front side (vehicle compartment side).

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 3 show a back door A according to an embodiment of the present invention, FIG. 1 is a perspective view of the back door inner panel 100 viewed from the rear side, and FIG. 2 is a line II-II in FIG. FIG. 3 is a perspective view of the back door inner panel 100 shown in FIG. 1 viewed from the front side (vehicle compartment side).

  The back door A is formed by combining the back door inner panel 100 and the back door outer panel (not shown). The back door inner panel 100 shown in FIGS. 1 and 3 is entirely formed by resin molding.

  The back door inner panel 100 extends in the vehicle width direction along the upper edge of the rear opening of the vehicle body, and extends in the vertical direction from the left and right ends of the back door upper portion 110 along the left and right side edges of the vehicle body rear opening. It has a back door left side 121 and a back door right side 122, and a back door skirt 130 that is connected to the lower side of the back door left side 121 and the back door right side 122 and closes the lower side of the rear opening of the vehicle body. When the back door upper part 110, the back door left part 121, the back door right part 122, and the area surrounded by the upper edge of the back door skirt part 130 form the window part 140 and the back door A is configured. In addition, window glass (not shown) is provided in this region.

  The back door upper part 110 is provided with a pair of left and right hinge attachment parts 111 and 112. The back door A is connected to the upper part of the rear opening of the vehicle body through hinges (not shown) attached to the hinge attaching portions 111 and 112 so as to be opened and closed.

  A lock mechanism attaching portion 131 is provided at the lower center of the back door skirt portion 130. In the back door A, a lock mechanism (not shown) attached to the lock mechanism attaching portion 131 engages with a striker (not shown) provided at the lower edge of the vehicle body rear opening, and is linked to the vehicle body. The closed state is maintained.

  The back door inner panel 100 also has an outward flange portion 101 formed on the outer periphery thereof, and an inward flange portion 102 formed on the inner periphery of the window portion 140. The outward flange portion 101 and the inward flange portion 102 are matched with the corresponding outward flange portion (not shown) and inward flange portion (not shown) provided in the back door outer panel (not shown), and are in the middle state. The back door A joined to is formed.

  The region other than the outward flange portion 101 and the inward flange portion 102 in the back door inner panel 100 is bulged toward the vehicle interior side (front side) with respect to the outward flange portion 101 and the inward flange portion 102 as a whole. It has been. Therefore, from the back door upper part 110 to the back door left side part 121 and the back door right side part 122, as shown in FIG. In the present embodiment, the U-shaped cross section 210 has a hat shape. Further, the back door hem 130 has an annular bulging portion 132 whose outer peripheral portion is bulged toward the passenger compartment side (front side), and the inside of the annular bulging portion 132 is recessed in the rear side. The recessed portion 133 is formed. The annular bulging portion 132 is connected to the U-shaped cross-sectional portion 210 of the back door left side portion 121 and the back door right side portion 122.

  The recessed portion 133 of the back door skirt 130 has diagonally connecting the lock mechanism attachment portion 131, the back door left side 121, the back door right side 122, and the left and right connecting portions 151 and 152 of the back door skirt 130. A left bead 221 and a right bead 222 extending along the direction are formed. The left bead 221 and the right bead 222 are configured to bulge out from the recessed portion 133 toward the passenger compartment side in a U-shaped cross section.

  Ribs 231 and 232 are formed at portions where the annular bulged portion 132 and the U-shaped cross-sectional portion 210 are connected to each other in the back door skirt portion 130. In the present embodiment, the ribs 231 and 232 are constituted by vertical vertical ribs 231 and horizontal horizontal ribs 232 that are substantially connected to the left bead 221 and the right bead 222, and the vertical ribs 231 and the horizontal ribs 231. 232 is connected to the inner surfaces 211 and 212 of the U-shaped cross section 210.

  Next, the effect of the reinforcing structure of the resin back door having the above-described configuration will be described.

  The back door skirt portion 130 has an annular bulge portion 132 located on the outer periphery thereof. Since the annular bulge portion 132 is bulged toward the front of the vehicle, the rigidity of the back door skirt portion 130 can be increased. Further, the back door skirt 130 has a recessed portion 133 positioned inside the annular bulge portion 132. Since the recessed portion 133 is recessed toward the vehicle rear side opposite to the direction in which the annular bulging portion 132 bulges, the rigidity of the back door skirt portion 130 can be further increased.

  Further, the reaction force acting on the lock mechanism attachment portion 131 when the back door A is opened and closed is transmitted from the annular bulge portion 132 to the pair of back door side portions (the back door left side portion 121 and the back door right side portion 122). For this reason, the concentration of the reaction force acting on the back door skirt 130 is reduced, and deformation of the back door skirt 130 can be suppressed.

  As a result, according to the reinforcing structure of the resin back door having the above-described configuration, the rigidity of the resin back door can be effectively increased without requiring a separate reinforcement. The resonance frequency can be increased, and the generation of a booming noise caused by vibration from the road surface or vibration caused by CVT can be suppressed as much as possible.

  Of course, the scope of the present invention is not limited to the above-described embodiments, and all design changes within the scope of the matters described in the claims are included in the scope of the present invention.

  Note that the present invention does not exclude the provision of a separate reinforcement in addition to the configuration of the present invention to further increase the rigidity of the back door A.

A: Back door 100: Back door inner panel 101: Outward flange portion 102: Inward flange portion 110: Back door upper portion 111, 112: Hinge mounting portion 121: Back door left portion 122: Back door right portion 130: Back door Bottom part 131: Lock mechanism attachment part 132: Annular bulging part 133: Recessed part 140: Window part 151: Connection part (left)
152: Connecting part (right)
210: U-shaped cross section 211, 212: inner surface 221: left bead 222: right bead 231: rib (vertical)
232: Rib (horizontal)

Claims (1)

A window part where window glass is provided;
An upper portion of the back door that is positioned above the vehicle and extends in the vehicle width direction from the window portion;
A back door hem located below the vehicle from the window,
Resin made of resin having a back door inner panel that is located on both the left and right sides of the window portion and extends in the vehicle vertical direction and includes a pair of back door side portions that connect the upper portion of the back door and the back door hem portion. A back door reinforcement structure,
The back door inner panel has an outward flange portion formed on the outer periphery thereof,
An inward flange portion is formed on the inner periphery of the window portion,
Each of the pair of back door side portions has a U-shaped cross-section bulged toward the front of the vehicle with respect to the outward flange portion and the inward flange portion,
The back door hem has an annular bulge located on the outer periphery thereof, and a recessed portion located on the inner side of the annular bulge,
The annular bulging portion is bulged toward the front of the vehicle with respect to the outward flange portion and the inward flange portion, and has a U-shaped cross section located at the lower end of the pair of back door side portions. connection,
The reinforcing structure for a resin back door, wherein the recessed portion is recessed toward the rear of the vehicle.

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