JP6587549B2 - 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 is similar to the back door made of sheet metal. 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 fitted into a portion surrounded by an upper portion of the back door, a pair of left and right back door sides, and an upper edge of the back door hem portion to form a rear window.

  The upper part of the back door is rotatably 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. In addition, the back door is normally urged so as to rotate up and rotate by a pair of left and right damper stays. This means that a force is always applied to the back door so as to be pushed downward by the damper stay even when the back door is closed. The upper end of the damper stage is connected to the inner upper part near both sides of the rear opening of the vehicle body, while the lower end is the inner surface of the back door, specifically, the inner surface of the back door hem near the pair of left and right back doors. Connected in place. Usually, the part to which the lower end of the damper stay is connected is located outward of the left and right hinges in the vehicle width direction. Therefore, a bending force always acts on the door corner portion from the portion where the hinge is provided in the upper portion of the back door to the left and right back door side portions.

  When the back door is made of resin, especially if the rigidity of the door corner is insufficient, the door corner will be deformed over time, and the position of the back door side or back door skirt will be lower than the design position, and the back door will be built. There may be a problem that the quality of the attachment is deteriorated or the lock mechanism malfunctions.

  In Patent Document 1, the rigidity of the door corner portion is provided by providing an L-shaped reinforcing member in a region extending from the hinge mounting position in the upper portion of the back door of the resin back door to the left and right back door side portions through the door corner portion. The structure which tried to solve the above-mentioned problem by increasing the value is disclosed.

  However, the method of providing such a reinforcing member to improve the rigidity of the door corner portion 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 2007-216870 A

  The present invention has been conceived under the circumstances described above, and is a resin back door that effectively improves the rigidity of the door corner without causing an increase in the number of parts or an increase in the number of assembly steps. The object is to provide a reinforcing structure.

  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 back door upper portion extending in the vehicle width direction, left and right back door side portions extending downward from both ends of the back door upper portion through a door corner portion, A resin back door reinforcement structure having a back door inner panel having a back door hem portion connected to the lower end of the back door side portion, and having a pair of left and right hinge mounting portions and a pair of left and right damper stay connecting portions. The door corner portion has an inner corner wall and an outer corner wall, and has a concave groove shape whose bottom portions are connected via an intermediate portion, and one end is connected to the inner corner wall. The other end is connected to the outer corner wall and includes a plurality of ribs arranged radially from the inner corner wall to the outer corner wall.

  If downward force continues to act on the back door inner panel due to the damper stay, the door corner portion tends to deform. Specifically, this deformation is caused by the outer corner wall expanding relative to the inner corner wall of the recessed groove-shaped door corner portion. Appears as a phenomenon to open. According to the reinforcing structure of the back door having the above-described configuration, the inner corner wall and the outer corner wall are connected by the plurality of ribs, so that the above-described expansion between the inner corner wall and the outer corner wall is prevented or suppressed. This means that the rigidity against the downward bending force acting on the door corner is increased.

  Accordingly, the rigidity of the door corner portion of the resin back door can be effectively increased without requiring a separate reinforcing member, and the back door is prevented from being deformed due to the downward force acting constantly by the damper stage. Can be suppressed.

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

It is the perspective view which looked at the back door inner panel which concerns on 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). It is an enlarged view of the right door corner part of the back door inner panel shown in FIG.

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

  1 to 4 show a resin back door A according to an embodiment of the present invention, FIG. 1 is a perspective view of the back door inner panel 100 as viewed from the rear side, and FIG. FIG. 3 is a perspective view of the back door inner panel viewed from the passenger compartment side (front side), and FIG. 4 is an enlarged view of the right door corner portion of the back door inner panel shown in FIG. It is.

  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 includes a back door upper portion 110 extending in the vehicle width direction along the upper edge of the rear opening of the vehicle body, and along the left and right edges of the rear opening of the vehicle body through the door corner portion 300 from the left and right ends of the back door upper portion 110. A back door left side portion 121 and a back door right side portion 122 that extend in the vertical direction, and a back door hem portion 130 that is connected to the lower side of the back door left side portion 121 and the back door right side portion 122 and closes the lower portion of the rear opening of the vehicle body. Have. 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 this region, a window glass (not shown) is fitted.

  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 that the back door A can be opened and closed.

  A damper stay connecting portion 135 is provided at the left and right upper portions of the back door skirt portion 130, that is, in the vicinity of the connecting portion between the back door left side portion 121 and the back door right side portion 122. The damper stay mounting portion 135 is connected to the other ends of left and right damper stays (not shown) whose one ends are connected to the vehicle body side, and the back door A is always urged in the upward direction by the damper stay (not shown). The This means that a downward force by a damper stay (not shown) always acts on the back door A at the damper stay attachment portion 135.

  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 through the door corner part 300 to the back door left side part 121 and the back door right side part 122, as shown in FIG.

  In detail, the left and right door corner portions 300 are configured as follows, as shown in FIGS. 1 and 4. That is, the door corner portion 300 is connected to the inward flange portion 102 and is folded to the front side (vehicle compartment side), and the outer corner portion 311 is connected to the outward flange portion 101 and is folded to the front side (vehicle compartment side). The corner wall 312 has a concave groove shape including an inner corner wall 311 and an intermediate portion 313 that connects the front side bottom portions of the outer corner wall 312. The left and right door corner portions 300 also have a plurality of ribs 320 having one end connected to the inner corner wall 311 and the other end connected to the outer corner wall 312 and arranged radially from the inner corner 311 wall to the outer corner wall 312. Is formed. These ribs 320 are also connected to an intermediate portion 313 that forms a groove-shaped bottom. Further, the left and right door corner portions 300 are formed with a plurality of auxiliary ribs 330 extending along the inflection of the door corner portion 300 so as to connect the plurality of radially extending ribs 320 and standing from the intermediate portion 313. Yes.

  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 section or the hat-shaped cross section 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 hem 130 is connected to the lock mechanism attaching portion 131 and the left and right connecting portions 151 and 152 of the back door left side 121 and the back door right side 122 and the back door skirt 130. A left bead 221 and a right bead 222 extending along an oblique 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 the portion where the annular bulging portion 132 and the U-shaped cross section or hat-shaped cross section 210 of the back door skirt 130 are connected. In the present embodiment, the ribs 231, 232 are constituted by vertical vertical ribs 231 that are substantially connected to the left and right beads 221 and 222, and horizontal horizontal ribs 232. Each of the ribs 232 is connected to the inner surface of the U-shaped cross section or the hat-shaped cross section.

  Next, the effect | action of the reinforcement structure of the resin back doors which has the said structure is demonstrated.

  If downward force continues to act on the damper stay connecting portion 135 of the back door inner panel 100 by the damper stay (not shown), bending stress concentrates on the door corner portion 300, and the door corner portion 300 tends to deform. This deformation appears as a phenomenon in which the outer corner wall 312 tends to expand with respect to the inner corner wall 311 of the door corner portion 300. In the door corner portion 300 of the door inner panel 100 according to the present embodiment, the inner corner wall 311 and the outer corner wall 312 are connected to each other by a plurality of ribs 320, and thus the outer corner with respect to the inner corner wall 311 described above. The expansion phenomenon of the wall 312 is prevented or suppressed. This means that the rigidity against the downward bending force acting on the door corner portion 300 is enhanced.

  In addition, since one end of each of the plurality of ribs 320 is arranged so as to extend radially from the inner corner wall 311 that is inherently highly rigid, a tensile force acting on each rib 320 is prevented when the door corner portion is prevented from being deformed. The inner corner wall 311 can be effectively received. In the present embodiment, in addition to the plurality of ribs 320, the auxiliary ribs 330 that connect the plurality of ribs 320 are formed, and therefore, when a tensile force acts on each rib 320, the ribs 320 are prevented from falling. Can do. Thereby, in this embodiment, the rigidity with respect to the bending force which acts on the door corner part 300 can further be improved.

  Accordingly, the rigidity of the door corner portion 300 of the resin back door can be effectively increased without requiring a separate reinforcing member, and the back door is caused by a downward force acting constantly by a damper stay (not shown). The deformation of A can be prevented or suppressed, and the deterioration of the built-in quality of the back door A over time and the occurrence of malfunction of the lock mechanism can be prevented or reduced.

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

  In addition to the above configuration, the present invention does not exclude the provision of a separate reinforcement to further increase the rigidity of the door corner portion of the back door.

A Back door 100 Back door inner panel 101 Outward flange portion 102 Inward flange portion 110 Back door upper portion 111 Hinge attachment portion 112 Hinge attachment portion 121 Back door left side portion 122 Back door right side portion 130 Back door skirt portion 131 Lock mechanism attachment portion 132 Annular bulging part 133 Recessed part 135 Damper paste connecting part 140 Window part 151 Connecting part (left)
152 Connecting part (right)
210 U-shaped cross section 211 opposing inner surface 212 opposing inner surface 221 left bead 222 right bead 231 rib (vertical)
232 rib (horizontal)
300 Door corner portion 311 Inner corner wall 312 Outer corner wall 313 Intermediate portion 320 Rib 330 Auxiliary rib

Claims (1)

A back door upper portion extending in the vehicle width direction, left and right back door side portions extending downward from both ends of the back door upper portion through a door corner portion, and back door hem portions connected to lower ends of the left and right back door side portions are provided. And a reinforcing structure for a resin back door having a back door inner panel provided with a pair of left and right hinge mounting portions and a pair of left and right damper stay coupling portions,
The door corner portion has an inner corner wall and an outer corner wall, and has a concave groove shape whose bottom portions are connected via an intermediate portion, one end connected to the inner corner wall, and the other end A reinforcing structure for a resin pack door, comprising: a plurality of ribs that are connected to the outer corner wall and are arranged radially from the inner corner wall to the outer corner wall.

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