Rear door for vehicle

Abstract

To suppress deformation of a door main body caused by force acting on a lower part of a back door.SOLUTION: A vehicular back door comprises a door main body (5) formed of an inner panel (10) made of resin and an outer panel (60) made of resin which are jointed to each other, and the vehicular back door is structured into a hatchback type in which an opening at a rear part of a vehicle main body is opened and closed by rotary motion in a vertical direction. An outer peripheral framework structure part (40) with a staircase-shape cross section is formed at an outer periphery portion of the inner panel. An arc-shaped lower framework structure part (50) curved to protrude upward is formed at a portion lower than a window part (7) of the inner panel. A central portion of the lower framework structure part is positioned with an interval above a lower side portion of the outer peripheral framework structure part, and both end portions of the lower framework structure part lead to sites at both ends in the lower side portion of the outer peripheral framework structure part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a rear door for a vehicle.

Background Art

[0002] Patent Document 1 discloses a resin rear door for a vehicle configured in a hatchback manner. In this rear door, a pair of left and right skeletal structures including a pair of rear door side portions, a pair of connecting portions, and a pair of beads are configured. Each connecting portion is provided on the rear door side portion. The cross-sectional shapes of the rear door side portion and the connecting portion are U-shaped openings to the rear of the vehicle. The pair of beads each extend obliquely upward from both sides of the left and right of the lock mechanism mounting portion to reach the connecting portion. The skeletal structure is continuous from a pair of hinge mounting portions provided at the upper part of the rear door to a lock mechanism mounting portion provided at the rear door bottom portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a hatchback-type rear door as disclosed in Patent Document 1, rubber contact portions provided at both end portions in the left-right direction of the lower end portion of the door body are applied to the vehicle body when the rear opening of the vehicle body is closed. As a result, the repulsive force of the contact portion acts on the lower part of the rear door. Further, when the user closes the rear door from the open state, the user pushes down the lower part of the rear door. At that time, a closing force is often applied by hanging a hand on one side of the left and right of the lower part of the rear door. When the repulsive force and the closing force of the contact portion act on one side of the left and right of the lower part of the rear door in this way, there is a risk of deformation of the door body.

[0005] An object of the present invention is to suppress deformation of the door body caused by a force acting on the lower part of the back door.

Means for Solving the Problems

[0006] In order to achieve the above object, in the present invention, when an external force is applied to the lower part of the left and right sides of the back door, the structure of the inner panel is devised so as to transmit and disperse the external force in the left and right directions.

[0007] Specifically, a first invention is a vehicle back door including a resin inner panel and a resin outer panel joined to face each other, and a door body having a window portion provided in the upper half portion. In this vehicle back door, the upper end portion of the door body is connected to the vehicle body main body via a hinge, and the rear opening of the vehicle body main body is opened and closed by a rotational movement in the vertical direction around the hinge. At both ends in the left-right direction of the lower end portion of the door body, contact portions are provided that contact the vehicle body main body when the door body closes the rear opening of the vehicle body main body.

[0008] In the vehicle back door of the first invention, an outer peripheral skeleton structure portion having a stepped cross section is formed on the outer peripheral portion of the inner panel. In a portion of the inner panel below the window portion, an arch-shaped lower skeleton structure portion is provided that curves so as to project upward from a lower side portion of the outer peripheral skeleton structure portion extending to the lower end portion of the door body. The central portion of the lower skeleton structure portion is positioned at an interval above the lower side portion of the outer peripheral skeleton structure portion, and both end portions of the lower skeleton structure portion are connected to both end portions of the lower side portion of the outer peripheral skeleton structure portion.

[0009] A second invention is a vehicle back door according to the first invention, wherein the lower skeleton structure portion has a bead-shaped portion that forms a hollow convex shape protruding toward the outer panel side and a rib-shaped portion formed continuously with the bead-shaped portion. Both end portions of the lower skeleton structure portion are constituted by the rib-shaped portion and overlap the outer peripheral skeleton structure portion.

[0010] The third invention is a vehicle back door in the vehicle back door of the first or second invention, wherein an upper portion of the lower side portion of the outer peripheral skeleton structure portion is formed by a stepped wall having a width in the front-rear direction. A concave recess portion is provided between the lower side portion of the outer peripheral skeleton structure portion and the lower skeleton structure portion by recessing the stepped wall upward. And the top surface portion of the recess portion is formed by the wall constituting the lower skeleton structure portion.

[0011] The fourth invention is a vehicle back door in any one of the vehicle back doors of the first to third inventions, wherein a plurality of abutting ribs protruding toward the outer panel side are provided in a portion of the inner panel between the lower side portion of the outer peripheral skeleton structure portion and the lower skeleton structure portion. The plurality of abutting ribs each extend in the vertical direction and are arranged at intervals in the left-right direction. Both ends of the abutting rib are connected to the lower side portion of the outer peripheral skeleton structure portion and the lower skeleton structure portion. And the tip of the abutting rib is located near the back surface of the outer panel.

[0012] The fifth invention is a vehicle back door in the vehicle back door of the fourth invention, wherein an upper portion of the lower side portion of the outer peripheral skeleton structure portion is formed by a stepped wall having a width in the front-rear direction. A concave recess portion is provided between the lower side portion of the outer peripheral skeleton structure portion and the lower skeleton structure portion by recessing the stepped wall upward. And the abutting rib is connected to the wall constituting the rear side portion of the recess portion.

[0013] The sixth invention is a vehicle back door in any one of the vehicle back doors of the first to fifth inventions, wherein the lower skeleton structure portion extends in the central portion of each divided region obtained by dividing the portion below the window portion of the door body in the left-right direction, and each central portion of the divided regions has a partial adhesion portion. The inner panel is adhered to the outer panel at the partial adhesion portion.

Advantages of the Invention

[0014] In the first invention, an outer peripheral frame structure portion is formed on the outer peripheral portion of the inner panel. Since the outer peripheral frame structure portion has a stepped cross-sectional shape, the rigidity of the inner panel is increased. And an arched lower frame structure portion is provided in a portion below the window portion of the inner panel. In the lower frame structure portion, the central portion is positioned at an interval upward from the lower side portion of the outer peripheral frame structure portion, and both end portions are connected to both end portions at the lower side portion of the outer peripheral frame structure portion. When a repulsive force or a closing force of an abutting portion acts on the left and right sides of the lower portion of the back door, such a lower frame structure portion transmits and disperses these forces in the left and right directions at the lower portion of the back door. Thereby, it is possible to suppress deformation of the door body due to the force acting on the lower portion of the back door.

[0015] In the second invention, both end portions connected to both end portions at the lower side portion of the outer peripheral frame structure portion in the lower frame structure portion are constituted by rib-shaped portions. If both end portions of the lower frame structure portion were constituted by bead-shaped portions, the shape of the outer peripheral frame structure portion would be disrupted by the bead-shaped portions, weakening the rigidity of the outer peripheral frame structure portion, so they cannot be provided overlapping the outer peripheral frame structure portion. On the other hand, if both end portions of the lower frame structure portion are constituted by rib-shaped portions, those both end portions can exist without disrupting the shape of the outer peripheral frame structure portion, so they can be provided overlapping the outer peripheral frame structure portion. This is advantageous for dispersing the repulsive force or the closing force of the abutting portion applied to the left and right sides of the lower portion of the back door at the lower portion of the back door.

[0016] In the third invention, a concave recess portion formed by recessing an upper side portion of the lower side portion of the outer peripheral frame structure portion upward is provided between the lower side portion of the outer peripheral frame structure portion and the lower frame structure portion. A portion between the lower side portion of the outer peripheral frame structure portion and the lower frame structure portion in the inner panel is reinforced by the three-dimensional shape of the recess portion. Thereby, the rigidity of the lower portion of the door body can be increased.

[0017] In the fourth invention, a plurality of abutting ribs are provided in a portion between the lower side portion of the outer peripheral skeleton structure portion and the lower skeleton structure portion of the inner panel. The portion between the lower side portion of the outer peripheral skeleton structure portion and the lower skeleton structure portion of the inner panel is connected and reinforced by the plurality of abutting ribs. Thereby, the rigidity of the abutting rib itself can be ensured. And the rigidity of the lower part of the door body can be enhanced.

[0018] Also, when closing the back door from the opened state, when a pushing-down force is applied to the lower part of the back door, the outer panel may be deformed so as to bend toward the inner panel side. When such deformation occurs in the outer panel, the deformed portion of the outer panel is received by the rigid abutting rib, and further deformation is restricted. Here, since the tip of the abutting rib is located near the back surface of the outer panel, the amount of deformation of the outer panel can be reduced. Thereby, the so-called rattling feeling caused by the outer panel being deformed so as to warp can be reduced.

[0019] In the fifth invention, the abutting rib is connected to a wall constituting the rear side portion of the recess portion. According to this, even if a sink mark occurs on the surface of the inner panel by providing the abutting rib, the sink mark exists on the inner surface of the recess portion, and thus is concealed from the vehicle interior side by the wall constituting the front side portion of the recess portion. Therefore, it is possible to suppress the appearance of the door body from being impaired due to the sink mark generated by providing the abutting rib.

[0020] In the sixth invention, the inner panel and the outer panel are adhered to each other at the partial adhesion portion of the lower skeleton structure portion at the central portion of each divided region obtained by dividing the lower side portion of the door body in the left-right direction. When the inner panel and the outer panel are not adhered to each other at the central portion of each divided region, when closing the back door from the opened state, when a pushing-down force is applied to one side in the left-right direction of the lower part of the back door, the outer panel is displaced in a direction approaching the inner panel in the divided region where the pushing-down force is applied, and is displaced in a direction away from the inner panel in the other divided region, causing a torsional deformation.

[0021] On the other hand, when the inner panel and the outer panel are adhered at the partial adhesion portion of the lower skeleton structure portion, it is possible to suppress the occurrence of torsional deformation in the outer panel. The outer panel is for forming the vehicle exterior appearance and does not significantly contribute to the rigidity of the door body. However, by not easily displacing the outer panel in a direction away from the inner panel, the outer panel can suitably contribute to enhancing the rigidity of the door body.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0023] Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. In the following embodiments, for convenience of explanation, the front side in the vehicle front-rear direction is referred to as "front", the rear side as "rear", the left side in the vehicle width direction facing the vehicle front as "left", the right side as "right", the upper side in the vehicle height direction as "upper", and the lower side as "lower". Also, regarding the back door according to this embodiment, unless otherwise stated about the open / closed state, the description will be based on the posture with the rear opening of the vehicle closed.

[0024] The vehicle back door 1 of this embodiment is an up-and-down opening / closing type back door. This back door 1 opens and closes the rear opening provided in the vehicle body of the hatchback vehicle by a rotational movement in the vertical direction. As shown in FIGS. 1 and 2, the back door 1 mainly includes a door body 5 and a plurality of lamp units 90.

[0025] A window portion 7 is provided in the upper half of the door body 5. At both ends in the left-right direction of the lower end portion of the door body 5, contact portions 8 are provided where the door body 5 contacts the vehicle body when the door body 5 closes the rear opening of the vehicle body. The door body 5 is formed by joining an inner panel 10 and an outer panel 60 facing each other, and includes a window panel 80 forming the window portion 7.

[0026] The plurality of lamp units 90 include a high-mount stop lamp unit 92 and a rear lamp unit 94. The rear lamp unit 94 includes a tail lamp and a rear turn signal. In FIG. 2, for convenience, only the left rear lamp unit 94 of the rear lamp unit 94 is shown, but the back door 1 is provided with a pair of left and right rear lamp units 94.

[0027] 〈Inner Panel〉 The inner panel 10 is a one-piece resin panel. The inner panel 10 is formed, for example, by injection molding. The inner panel 10 is made of, for example, a thermoplastic resin containing a fiber reinforcing material. As the material of the inner panel 10, polypropylene with glass fiber (PP-GF), polypropylene with carbon fiber (PP-GF), polypropylene with cellulose nanofiber (PP-CNF), etc. are used.

[0028] As shown in FIG. 3, a window opening 12 is formed in the upper half of the inner panel 10. The window opening 12 is a substantially trapezoidal opening extending in the left-right direction. The portion above the window opening 12 of the inner panel 10 (hereinafter simply referred to as the upper part) forms the ceiling portion 9 of the door body 5. The portions located on both the left and right sides of the window opening 12 of the inner panel 10 constitute concave pillar portions 14 that open rearward. The portion below the window opening 12 of the inner panel 10 (hereinafter simply referred to as the lower part) constitutes the lower part of the door body 5.

[0029] An inner standing wall 16 is provided at the peripheral edge portion of the window opening 12 in the inner panel 10. The inner standing wall 16 rises rearward toward the outer panel 60 side. An inner joining piece 18 is provided at the rear end of the inner standing wall 16. The inner joining piece 18 protrudes inward of the window opening 12. Further, an outer standing wall 20 is provided at the outer peripheral edge portion of the inner panel 10. The outer standing wall 20 rises rearward toward the outer panel 60 side. An outer joining piece 22 is provided at the rear end of the outer standing wall 20. The outer joining piece 22 protrudes to the outer peripheral side of the inner panel 10.

[0030] On the outer vertical wall 20 at the upper part of the inner panel 10, a pair of hinge attachment parts 24 are provided. The outer vertical wall 20 provided with the pair of hinge attachment parts 24 extends vertically and horizontally and constitutes the rear end part at the upper part of the inner panel 10. The pair of hinge attachment parts 24 are formed at positions spaced apart from each other on both the left and right sides. As shown in FIG. 5, a hinge component 100 connected to the vehicle body main body is fixed to the hinge attachment part 24 from the front using a fastener 102 such as a bolt.

[0031] The upper end part of the door main body 5 is connected to the vehicle body main body via a pair of hinge components 100 so as to be openable and closable. The back door 1 rotates in the vertical direction around the hinge component 100. On both the left and right sides of the inner panel 10, metal upper reinforcements 25 are integrally provided by insert molding. Each upper reinforcement 25 extends from the hinge attachment part 24 in the inner panel 10 through the pillar part 14 to the part where a back door damper (not shown) is connected.

[0032] As shown in FIGS. 3 and 4, an upper service hole 26 is formed in the inner vertical wall 16 at the upper part of the inner panel 10. The upper service hole 26 is a working opening used for operations such as connecting a harness to the high mount stop lamp unit 92 and maintenance work. The inner vertical wall 16 in which the upper service hole 26 is formed extends front-rear and left-right and is formed with the thickness direction corresponding up and down.

[0033] The upper service hole 26 is formed in the central part in the left-right direction of the inner vertical wall 16. The peripheral part of the upper service hole 26 in the inner panel 10 is recessed upward. The cover member 84 is fitted into the recess 36 in the peripheral part of the upper service hole 26 to close the upper service hole 26. The upper service hole 26 is closed from the lower side by the cover member 84.

[0034] Further, a plurality of support ribs 28 are provided on the upper part of the inner panel 10. The plurality of support ribs 28 are arranged at intervals in the left - right direction. Each support rib 28 protrudes toward the upper panel 62 side and extends linearly in the front - rear direction. The tips of these support ribs 28 are located near the back surface of the upper panel 62. When the upper panel 62 deflects downward, it abuts against and is supported by the support ribs 28. By this, the downward deflection of the upper panel 62 is restricted.

[0035] Among the plurality of support ribs 28, some (three in this example) support ribs 28 located in the middle in the left - right direction are formed so as to straddle the upper service hole 26. The upper service hole 26 is partitioned by the support ribs 28. The support ribs 28 are also formed on the edges on both the left and right sides of the upper service hole 26. Each support rib 28 formed on the edges on both the left and right sides of the upper service hole 26 corresponds to the recess 36 in the peripheral part of the upper service hole 26 and is in a positional relationship of overlapping with the cover member 84.

[0036] As shown in FIG. 3, a latch mounting portion 29 is provided at the lower edge portion of the lower part of the inner panel 10. As shown in FIG. 10, a latch 34 is attached to the latch mounting portion 29. This latch 34 cooperates with a striker provided at the lower edge portion of the rear opening of the vehicle body main body to constitute a locking mechanism for locking the back door 1 in a closed state. A metal lower reinforcement 36 is integrally provided in the latch mounting portion 29 by insert molding.

[0037] As shown in FIG. 3, a component mounting portion 30 is provided at the portion near the center in the lower part of the inner panel 10. A lamp for license plate illumination, a knob mechanism, etc. are attached to the component mounting portion 30. A lower service hole 31 is formed below the component mounting portion 30 of the inner panel 10. The lower service hole 31 is an opening used for the attachment work and maintenance work of the latch 34 and the like.

[0038] At both ends in the left - right direction of the lower end portion of the inner panel 10 (strictly speaking, the second wall 43 described later), stopper mounting portions 32 are respectively formed. Mounting holes 33 are formed in the stopper mounting portions 32. As shown in FIG. 8, a rubber stopper member 85 is inserted into and mounted on the mounting hole 33 in the stopper mounting portion 32. The stopper member 85 is exposed to the outside of the door body 5 and constitutes the contact portion 8. The stopper member 85 serves to buffer the impact when the back door 1 is closed from the open state.

[0039] As shown in FIGS. 7 to 11, in the portion including the component mounting portion 30 of the inner panel 10, a recess 34 is formed where the front side is recessed and the rear side protrudes. The lower service hole 31 is formed in the inner part of the recess 34. The opening of the recess 34 is closed from the front side by a cover trim 86. As a structure for reinforcing the rigidity of the inner panel 10, an outer peripheral skeleton structure portion 40 is formed on the outer peripheral portion of the inner panel 10. Also, a lower skeleton structure portion 50 is formed at the lower part of the inner panel 10. The outer peripheral skeleton structure portion 40 and the lower skeleton structure portion 50 are connected to each other.

[0040] 〈Outer panel〉 As shown in FIGS. 1 and 2, the outer panel 60 is divided into two parts vertically. The outer panel 60 is composed of an upper panel 62 and a lower panel 64. These upper panel 62 and lower panel 64 are each resin panels. The upper panel 62 and the lower panel 64 are formed, for example, by injection molding. As materials for the upper panel 62 and the lower panel 64, polypropylene with talc (PP - T: Polypropylene Talc) or a synthetic resin mixed with ethylene propylene diene monomer rubber (EPDM: Ethylene Propylene Diene Monomer) and the like are used.

[0041] As shown in FIG. 4, the upper panel 62 faces the upper part of the inner panel 10. The upper panel 62 forms the ceiling part 9 of the door body 5 and constitutes a spoiler part 66 protruding rearward. A lamp unit mounting part 67 is provided at the rear end part of the spoiler part 66. A high mount stop lamp unit 92 is attached to the lamp unit mounting part 67. The lower panel part constituting the lower side part of the spoiler part 66 of the upper panel 62 is folded back obliquely downward at the front side to constitute an upper joint piece 69.

[0042] As shown in FIGS. 4 and 5, the outer edge part of the upper panel 62 is joined to the inner panel 10 using an adhesive 75. Specifically, the front edge part of the upper panel 62 is adhered to the outer joint piece 22 of the inner panel 10. The upper joint piece 69 constituting the lower edge part of the upper panel 62 is adhered to the inner joint piece 18 of the inner panel 10. An internal space S is formed between the upper panel 62 and the inner panel 10 joined in this way.

[0043] The lower panel 64 faces the lower part of the inner panel 10. Lamp unit mounting parts 68 are provided on both the left and right sides of the lower panel 64. A rear lamp unit 94 is attached to the lamp unit mounting parts 68. For example, the rear lamp unit 94 is fastened together at a plurality of locations from the front using fasteners 96 such as nuts to the outer joint piece 22 of the inner panel 10 and the lower panel 64.

[0044] A plate mounting part 70 is provided at the central part of the lower panel 64. A license plate (number plate) (not shown) is attached to the plate mounting part 70. A lower joint piece 72 is provided at the upper edge part of the lower panel 64. The lower joint piece 72 is positioned forward via a step part extending in the front-rear direction. This lower joint piece 72 extends over the entire width in the left-right direction of the upper edge part of the lower panel 64.

[0045] The outer edge portion of the lower panel 64 is joined to the inner panel 10 using an adhesive 75. Specifically, the lower joining piece 72 that constitutes the upper edge portion of the lower panel 64 is adhered to the inner joining piece 18 of the inner panel 10. The left and right edge portions and the lower edge portion of the lower panel 64 are adhered to the outer joining piece 22 of the inner panel 10. An internal space S is formed between the lower panel 64 and the inner panel 10 joined in this manner.

[0046] The window panel 80 is a horizontally long panel that extends across both left and right ends of the back door 1. The window panel 80 is disposed between the upper panel 62 and the lower panel 64 to close the window opening 12 of the inner panel 10 and cover the opening of the pillar portion 14 of the inner panel 10. The window panel 80 is made of a transparent resin such as polycarbonate (PC) or glass. Although not shown, a concealment layer made of black ceramics or the like is provided on the outer peripheral portion of the window panel 80 to conceal the joining portion with the outer panel 60.

[0047] The outer edge portion of the window panel 80 is joined to the outer panel 60 and the inner panel 10 using an adhesive 75. Specifically, the upper edge portion of the window panel 80 is adhered to the upper joining piece 69 of the upper panel 62. The lower edge portion of the window panel 80 is adhered to the lower joining piece 72 of the lower panel 64. The left and right edge portions of the window panel 80 are adhered to the outer joining piece 22 between the upper panel 62 and the lower panel 64 in the inner panel 10. An internal space S is formed between the window panel 80 joined in this manner and the pillar portion 14 of the inner panel 10.

[0048] In the internal space S between the outer panel 60 and the window panel 80 and the inner panel 10 described above, a harness 98 that supplies power to a lamp unit 90 such as a high mount stop lamp unit 92 and a rear lamp unit 94 is laid. The harness 98 is drawn into the internal space S through a grommet 38 from an opening 37 formed in the outer standing wall 20 at the upper part of the inner panel 10.

[0049] 〈Outer Peripheral Skeleton Structure Portion〉 The outer peripheral frame structure portion 40 is provided over the entire outer peripheral portion of the inner panel 10. The outer peripheral frame structure portion 40 is formed in a stepped cross-sectional shape by a combination of a plurality of stepped walls 41. As shown in FIGS. 4 to 11, the outer peripheral frame structure portion 40 has, as the stepped wall 41, a first wall 42, a second wall 43, and a third wall 44. The first wall 42, the second wall 43, and the third wall 44 are continuously formed in this order from the outer peripheral side of the inner panel 10 toward the window opening 12 side.

[0050] The first wall 42 constitutes the outer standing wall 20. The first wall 42 at the upper part of the inner panel 10 extends vertically and horizontally, and is provided with the thickness direction corresponding to the front-rear direction (see FIGS. 4 and 5). The first wall 42 on both the left and right sides of the inner panel 10 extends front-rear and vertically, and is provided with the thickness direction corresponding to the left-right direction (see FIGS. 6 and 7). The first wall 42 at the lower part of the inner panel 10 extends front-rear, left and right, and is provided with the thickness direction corresponding to the vertical direction (see FIGS. 9 to 11).

[0051] The second wall 43 is connected at an angle to the end portion located on the vehicle interior side of the first wall 42. The second wall 43 at the upper part of the inner panel 10 extends front-rear, left and right, and is provided with the thickness direction corresponding to the vertical direction (see FIGS. 4 and 5). The second wall 43 at the upper part of the inner panel 10 has a stepped cross-sectional shape by itself. The second wall 43 on both the left and right sides and the lower part of the inner panel 10 extends vertically and horizontally, and is provided with the thickness direction corresponding to the front-rear direction (see FIGS. 6 and 7, FIGS. 9 to 11).

[0052] The third wall 44 is connected at an angle to the end portion on the window opening 12 side of the second wall 43. The third wall 44 at the upper part of the inner panel 10 extends in the vertical direction, and is provided to face the first wall 42 in the front-rear direction (see FIGS. 4 and 5). The third wall 44 on both the left and right sides of the inner panel 10 extends front-rear and vertically, and is provided to face the first wall 42 in the left-right direction (see FIGS. 6 and 7). The third wall 44 at the lower part of the inner panel 10 extends front-rear, left and right, and is provided to face the first wall 42 in the vertical direction (see FIGS. 9 to 11).

[0053] As shown in FIGS. 9 to 11, the upper part of the lower side portion of the outer peripheral skeleton structure portion 40 that extends to the lower end portion of the door body 5 is formed by the third wall 44 in the lower part of the inner panel 10. This third wall 44 has a width in the front-rear direction. A pair of recessed portions 45 are provided between the lower side portion of the outer peripheral skeleton structure portion 40 and the lower skeleton structure portion 50. The recessed portions 45 are located on both the left and right sides of the lower service hole 31. The recessed portions 45 are formed in a concave shape by recessing the third wall 44 in the lower part of the inner panel 10 upward.

[0054] The recessed portion 45 is a hollow portion that bulges rearward and opens downward. The recessed portion 45 has a rear wall 46 and a front wall 47. The rear wall 46 constitutes the rear side portion of the recessed portion 45. The front wall 47 constitutes the front side portion of the recessed portion 45. These rear wall 46 and front wall 47 face each other in the front-rear direction. A support projection 48 that supports the cover trim 86 and reinforces the recessed portion 45 is provided on the front wall 47. The top surface portion 49 of the recessed portion 45 is formed by the lower wall 54 that constitutes the lower skeleton structure portion 50.

[0055] 〈Lower Skeleton Structure Portion〉 As shown in FIG. 3, the lower skeleton structure portion 50 is formed in an arch shape that curves upward from the lower side portion of the outer peripheral skeleton structure portion 40 below the component mounting portion 30 in the inner panel 10. The central portion of the lower skeleton structure portion 50 is located at an interval above the lower side portion of the outer peripheral skeleton structure portion 40. And both end portions of the lower skeleton structure portion 50 are connected to both end portions of the lower side portion of the outer peripheral skeleton structure portion 40.

[0056] As also shown in FIGS. 8 to 11, the lower skeleton structure portion 50 has a bead-shaped portion 51 and a rib-shaped portion 55. The bead-shaped portion 51 extends in the left-right direction at the central portion in the lower part of the inner panel 10. The bead-shaped portion 51 forms a hollow convex shape protruding toward the lower panel 64 side. The bead-shaped portion 51 has an upper wall 52, a rear wall 53, and a lower wall 54. The upper wall 52, the rear wall 53, and the lower wall 54 are continuously formed in this order from the upper side to the lower side.

[0057] The upper wall 52 constitutes the upper portion of the bead-shaped portion 51. The upper wall 52 extends in the front-rear, left-right directions and is provided with the thickness direction corresponding to the up-down direction. The rear wall 53 constitutes the rear portion of the bead-shaped portion 51. The rear wall 53 is connected to the rear end of the upper wall 52 at an angle. The rear wall 53 extends in the up-down, left-right directions and is provided with the thickness direction corresponding to the front-rear direction. The lower wall 54 constitutes the lower portion of the bead-shaped portion. The lower wall is connected to the lower end of the rear wall at an angle. The lower wall 54 extends in the front-rear, left-right directions and is provided to face the upper wall 52 in the up-down direction.

[0058] The rib-shaped portions 55 are provided in a pair at both left and right ends of the bead-shaped portion 51. The pair of rib-shaped portions 55 are each formed continuously with the bead-shaped portion 51. As shown in FIG. 12, both end portions of the lower skeleton structure portion 50 are constituted by the rib-shaped portions 55. The rib-shaped portion 55 has a plurality of reinforcing ribs 56a (three reinforcing ribs 56a in this example). The plurality of reinforcing ribs 56a each project toward the lower panel 64 side and extend linearly from the bead-shaped portion 51 toward the stopper mounting portion 32 side.

[0059] Each reinforcing rib 56a forming the rib-shaped portion 55 is connected to the first wall 42, the second wall 43, and the third wall 44. In this way, both end portions of the lower skeleton structure portion 50 overlap the outer peripheral skeleton structure portion 40 without deforming the shape of the outer peripheral skeleton structure portion 40. Further, the plurality of reinforcing ribs 56a are integrally connected by other reinforcing ribs 56b provided so as to partition between the bead-shaped portion 51 and the stopper mounting portion 32.

[0060] The bead-shaped portion 51 of the lower skeleton structure portion 50 extends in the central portions of the respective divided regions RA, LA obtained by dividing the portion below the window portion 7 of the door body 5 in the left-right direction. The bead-shaped portion 51 has a pair of partial adhesion portions 57. The partial adhesion portions 57 are provided at both end portions in the left-right direction of the bead-shaped portion 51 and are constituted by the rear wall 53. The partial adhesion portions 57 are each located at the central portion of both divided regions RA, LA. The inner panel 10 is adhered to the lower panel 64 using an adhesive 75 at those respective partial adhesion portions 57.

[0061] In a portion between the lower side portion of the outer peripheral skeleton structure portion 40 and the lower skeleton structure portion 50 of the inner panel 10, a plurality of abutting ribs 58 are provided. The plurality of abutting ribs 58 are arranged at intervals in the left - right direction. Each abutting rib 58 protrudes toward the lower panel 64 side and extends linearly in the vertical direction. The tips of these abutting ribs 58 are located near the back surface of the lower panel 64. When the lower panel 64 deflects forward, it abuts against and is supported by the abutting rib 58. By this, the forward deflection of the lower panel 64 is restricted.

[0062] Each reinforcing rib 56a forming the rib - shaped portion 55 described above also plays a role in restricting the forward deflection of the lower panel 64 in the same manner as the abutting rib 58. In the middle part in the vertical direction of some of the abutting ribs 58, a reinforcing rib 59 is provided. The reinforcing rib 59 protrudes on both the left and right sides of the abutting rib 58 and extends over the entire height direction of the abutting rib 58. The front end portion of the reinforcing rib 59 is connected to the bent portion of the inner panel 10, specifically, the connection portion between the first wall 42 and the second wall 43 (see FIGS. 9 and 11).

[0063] Both ends of each abutting rib 58 are connected to the lower side portion of the outer peripheral skeleton structure portion 40 and the lower skeleton structure portion 50. That is, the lower end of each abutting rib 58 is connected to the first wall 42, the second wall 43, and the third wall 44 forming the lower side portion of the outer peripheral skeleton structure portion 40. The upper end of each abutting rib 58 is connected to the lower wall 54 of the lower skeleton structure portion 50. Some of the abutting ribs 58 are provided in a portion of the inner panel 10 corresponding to the recess portion 45. The root portion of the corresponding abutting rib 58 is connected to the front wall 47 of the recess portion 45.

[0064] -Features of the Embodiment- In the back door 1 of this embodiment, an outer peripheral frame structure portion 40 is formed on the outer peripheral portion of the inner panel 10. Since the outer peripheral frame structure portion 40 has a stepped cross-sectional shape, the rigidity of the inner panel 10 is increased. And an arch-shaped lower frame structure portion 50 is provided in a portion below the window portion 7 of the inner panel 10. In the lower frame structure portion 50, the central portion is positioned at an interval upward from the lower side portion of the outer peripheral frame structure portion 40, and both end portions are connected to both end portions in the lower side portion of the outer peripheral frame structure portion 40. When such a repulsive force or closing force of the contact portion 8 acts on the left and right sides of the lower portion of the back door 1, such forces are transmitted and dispersed in the left-right direction at the lower portion of the back door 1. Thereby, it is possible to suppress the door body 5 from being deformed by the force acting on the lower portion of the back door 1.

[0065] In the back door 1 of this embodiment, both end portions connected to both end portions in the lower side portion of the outer peripheral frame structure portion 40 of the lower frame structure portion 50 are constituted by rib-shaped portions 55. If both end portions of the lower frame structure portion 50 are constituted by bead-shaped portions 51, the shape of the outer peripheral frame structure portion 40 will be broken by the bead-shaped portions 51 and the rigidity of the outer peripheral frame structure portion 40 will be weakened, so they cannot be provided overlapping the outer peripheral frame structure portion 40. On the other hand, if both end portions of the lower frame structure portion 50 are constituted by rib-shaped portions 55, those both end portions can exist without breaking the shape of the outer peripheral frame structure portion 40, so they can be provided overlapping the outer peripheral frame structure portion 40. This is advantageous for dispersing the repulsive force or closing force of the contact portion 8 applied to the left and right sides of the lower portion of the back door 1 at the lower portion of the back door 1.

[0066] In the back door 1 of this embodiment, a concave recess portion 45 formed by recessing the upper side portion of the lower side portion of the outer peripheral frame structure portion 40 upward is provided between the lower side portion of the outer peripheral frame structure portion 40 and the lower frame structure portion 50. The portion between the lower side portion of the outer peripheral frame structure portion 40 and the lower frame structure portion 50 of the inner panel 10 is reinforced by the three-dimensional shape of the recess portion 45. Thereby, the rigidity of the lower portion of the door body 5 can be increased.

[0067] In the back door 1 of this embodiment, a plurality of abutment ribs 58 are provided in a portion between the lower side portion of the outer peripheral skeleton structure portion 40 and the lower skeleton structure portion 50 in the inner panel 10. The portion between the lower side portion of the outer peripheral skeleton structure portion 40 and the lower skeleton structure portion 50 in the inner panel 10 is connected and reinforced by the plurality of abutment ribs 58. Thereby, the rigidity of the abutment rib 58 itself can be ensured. And the rigidity of the lower part of the door body 5 can be enhanced.

[0068] Further, when closing the back door 1 from the opened state, when a pressing force is applied to the lower part of the back door 1, the lower panel 64 may be deformed so as to bend toward the inner panel 10 side. When such deformation occurs in the lower panel 64, the deformed portion of the lower panel 64 is received by the rigid abutment rib 58, and further deformation is restricted. Here, since the tip of the abutment rib 58 is located near the back surface of the lower panel 64, the amount of deformation of the lower panel 64 can be reduced. Thereby, the so-called rattling feeling caused by the lower panel 64 being deformed so as to warp can be reduced.

[0069] In the back door 1 of this embodiment, the abutment rib 58 is connected to the rear wall 53 of the recess portion 45. According to this, even if a sink mark occurs on the surface of the inner panel 10 by providing the abutment rib 58, the sink mark exists on the inner surface of the recess portion 45, and thus is hidden from the vehicle interior side by the front wall 47 of the recess portion 45. Therefore, it is possible to suppress the appearance of the door body 5 from being impaired due to the sink mark generated by providing the abutment rib 58.

[0070] In the back door 1 of this embodiment, the inner panel 10 and the outer panel 60 are adhered to each other by a partial adhesive portion 57 of the lower skeleton structure portion 50 at the central portions of the divided regions Ra and RL obtained by dividing the lower portion of the door body 5 in the left - right direction. According to this, when closing the back door 1 from the open state, as indicated by the solid - line arrow in FIG. 1, by the downward - pressing force applied to the left - right one - side of the lower part of the back door 1, the lower panel 64 is displaced in the direction approaching the inner panel 10 (the direction indicated by the virtual arrow) in one divided region (the divided region RA in the example shown in FIG. 1), and it is possible to suppress the occurrence of a torsional deformation in which the lower panel 64 is displaced in the direction away from the inner panel 10 (the direction indicated by the virtual arrow) in the other divided region (the divided region LA in the example shown in FIG. 1). Thereby, the lower panel 64 can be suitably contributed to enhancing the rigidity of the door body 5.

[0071] As described above, as an example of the present invention, the preferred embodiments have been described. However, the present invention is not limited to this, and it is also applicable to embodiments in which changes, replacements, additions, omissions, etc. are appropriately made. It is understood by those skilled in the art that the above - described embodiments are examples, that various further deformations are possible for each of their constituent elements, and that such deformations also belong to the scope of the present invention.

[0072] For example, the above - described embodiment may have the following configuration.

[0073] In the above - described embodiment, the outer - peripheral skeleton structure portion 40 is assumed to have three stepped - configuration walls 41 (the first wall 42, the second wall 43, and the third wall 44), but it is not limited to this. The outer - peripheral skeleton structure portion 40 may be composed of two stepped - configuration walls 41, or may be composed of three or more stepped - configuration walls 41. As long as the outer - peripheral skeleton structure portion 40 is provided with a cross - sectional shape, other structures for enhancing the rigidity of the inner panel 10 may be adopted.

[0074] In the above-described embodiment, the lower skeleton structure portion 50 has been described as having the bead-shaped portion 51 and the rib-shaped portion 55, but it is not limited thereto. The lower skeleton structure portion 50 may be composed only of the bead-shaped portion 51 or may be composed only of the rib-shaped portion 55. As long as the lower skeleton structure portion 50 is provided in an arch shape that curves upward from the lower side portion of the outer peripheral skeleton structure portion 40, other structures for enhancing the rigidity of the inner panel 10 may be employed.

[0075] In the above-described embodiment, the outer panel 60 is described as being composed of two divided bodies, the upper panel 62 and the lower panel 64, but it is not limited thereto. The outer panel 60 may be composed of a single panel.

Industrial Applicability

[0076] As described above, the present invention is useful for a vehicle back door.

Explanation of Reference Numerals

[0077] 1 Back door 5 Door body 7 Window portion 8 Contact portion 10 Inner panel 40 Outer peripheral skeleton structure portion 44 Third wall (step structure wall) 45 Recess portion 49 Top surface portion 50 Lower skeleton structure portion 51 Bead-shaped portion 54 Lower wall 55 Rib-shaped portion 57 Partial adhesion portion 58 Contact rib 60 Outer panel 100 Hinge component RA, LA Division region

Claims

1. A vehicle rear door comprising a door body (5) formed by joining a resin inner panel (10) and a resin outer panel (60) facing each other, and having a window portion (7) provided in the upper half portion, wherein an upper end portion of the door body (5) is connected to a vehicle body main body via a hinge component (100), and the rear opening of the vehicle body main body is opened and closed by a rotational movement in the vertical direction about the hinge component (100), and abutting portions (8) that abut against the vehicle body main body when the door body (5) closes the rear opening of the vehicle body main body are provided at both end portions in the left - right direction of a lower end portion of the door body (5). An outer peripheral skeleton structure portion (40) having a stepped cross - section is formed on an outer peripheral portion of the inner panel (10). An arch - shaped lower skeleton structure portion (50) that curves so as to project upward from a lower side portion of the outer peripheral skeleton structure portion (40) extending to a lower end portion of the door body (5) is provided in a portion of the inner panel (10) below the window portion (7). A central portion of the lower skeleton structure portion (50) is positioned at a distance above the lower side portion of the outer peripheral skeleton structure portion (40), and both end portions of the lower skeleton structure portion (50) are connected to both end portions of the lower side portion of the outer peripheral skeleton structure portion (40). The lower skeleton structure portion (50) has a hollow convex bead - shaped portion (51) that protrudes toward the outer panel (60) side and a rib - shaped portion (55) formed continuously with the bead - shaped portion (51). Both end portions of the lower skeleton structure portion (50) are constituted by the rib - shaped portion (55) and overlap the outer peripheral skeleton structure portion (40). A vehicle rear door characterized by the above.

2. A vehicle rear door comprising a door body (5) formed by joining a resin inner panel (10) and a resin outer panel (60) facing each other, and having a window portion (7) provided in the upper half portion, wherein an upper end portion of the door body (5) is connected to a vehicle body main body via a hinge component (100), and the rear opening of the vehicle body main body is opened and closed by a rotational movement in the vertical direction about the hinge component (100), and abutting portions (8) that abut against the vehicle body main body when the door body (5) closes the rear opening of the vehicle body main body are provided at both end portions in the left - right direction of a lower end portion of the door body (5). An outer peripheral skeleton structure portion (40) having a stepped cross - section is formed on an outer peripheral portion of the inner panel (10). In a portion of the inner panel (10) below the window portion (7), an arch-shaped lower skeleton structure portion (50) is provided so as to project upward from a lower side portion of the outer peripheral skeleton structure portion (40) that extends to a lower end portion of the door body (5). A central portion of the lower skeleton structure portion (50) is positioned at an interval above the lower side portion of the outer peripheral skeleton structure portion (40), and both end portions of the lower skeleton structure portion (50) are connected to both end portions of the lower side portion of the outer peripheral skeleton structure portion (40). An upper side portion of the lower side portion of the outer peripheral skeleton structure portion (40) is formed by a stepped wall (44) having a width in the front-rear direction. A concave recess portion (45) is provided between the lower side portion of the outer peripheral skeleton structure portion (40) and the lower skeleton structure portion (50) by recessing the stepped wall (44) upward. A top surface portion (49) of the recess portion (45) is formed by a wall (54) constituting the lower skeleton structure portion (50). A vehicle back door characterized by the above.

3. A vehicle back door comprising a door body (5) formed by joining a resin inner panel (10) and a resin outer panel (60) in a state of facing each other, and a window portion (7) provided in an upper half portion. An upper end portion of the door body (5) is connected to a vehicle body main body via a hinge component (100), and the rear opening of the vehicle body main body is opened and closed by a rotational movement in the vertical direction centered on the hinge component (100). A vehicle back door, wherein contact portions (8) that contact the vehicle body main body when the door body (5) closes the rear opening of the vehicle body main body are provided at both end portions in the left-right direction of a lower end portion of the door body (5). An outer peripheral skeleton structure portion (40) having a stepped cross-section is formed in an outer peripheral portion of the inner panel (10). In a portion of the inner panel (10) below the window portion (7), an arch-shaped lower skeleton structure portion (50) is provided so as to project upward from a lower side portion of the outer peripheral skeleton structure portion (40) that extends to a lower end portion of the door body (5). A central portion of the lower skeleton structure portion (50) is positioned at an interval above the lower side portion of the outer peripheral skeleton structure portion (40), and both end portions of the lower skeleton structure portion (50) are connected to both end portions of the lower side portion of the outer peripheral skeleton structure portion (40). In a portion between a lower side portion of the outer peripheral skeleton structure portion (40) and the lower skeleton structure portion (50) of the inner panel (10), a plurality of abutting ribs (58) protruding toward the outer panel (60) side are provided. The plurality of abutting ribs (58) each extend in the vertical direction and are arranged at intervals in the horizontal direction. Both ends of the abutting rib (58) are connected to the lower side portion of the outer peripheral skeleton structure portion (40) and the lower skeleton structure portion (50). The tip of the abutting rib (58) is located near the back surface of the outer panel (60). An upper side portion of the lower side portion of the outer peripheral skeleton structure portion (40) is formed by a stepped wall (44) having a width in the front-rear direction. A concave recess portion (45) formed by recessing the stepped wall (44) upward is provided between the lower side portion of the outer peripheral skeleton structure portion (40) and the lower skeleton structure portion (50). The abutting rib (58) is connected to a wall (46) constituting a rear side portion of the recess portion (45). A vehicle back door, characterized in that.

4. In the vehicle back door according to any one of Claims 1 to 3, The lower skeleton structure portion (50) has a hollow convex bead-shaped portion (51) protruding toward the outer panel (60) side. The bead-shaped portion (51) extends through a central portion of each divided region (RA, LA) obtained by dividing a portion below the window portion (7) of the door body (5) in the horizontal direction, and each divided region (RA, LA) has a partial adhesion portion (57) at the central portion thereof. The inner panel (10) is adhered to the outer panel (60) at the partial adhesion portion (57). A vehicle back door, characterized in that.

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