Reinforcement Structure for Vehicle Cargo Boxes

Abstract

A reinforcement structure for a vehicle cargo box includes: a headboard configuring a wall surface on the vehicle cargo box at the front side of the vehicle; a side wall disposed intersecting with the headboard; and a plate-shaped fixed mounting member connecting the headboard and the side wall. The fixed mounting member includes: a first fixed mounting member provided on one side of the fixed mounting member and fixedly mounted on an upper portion of the headboard; and a second fixed mounting member provided on the other side of the fixed mounting member and fixedly mounted on a predetermined portion of the side wall located on the front side of the vehicle relative to the headboard.

Description

Description Reinforcement Structure for Vehicle Cargo Boxes Invention Engineering Field The present invention relates to a reinforcing structure for the cargo box of a vehicle. Background of the Invention In the related art, vehicles are known that include a box-shaped vehicle cargo box behind the seats (cab) where passengers ride. Techniques for strengthening the vehicle cargo box in such vehicles are disclosed. For example, Patent Literature 1 discloses a vehicle cargo bed floor assembly structure that includes: a deck front pillar extending to a location below the cargo bed floor along a forward edge on a side wall of the cargo bed floor and wherein said side wall is coupled; an upper coupling portion of the deck front pillar coupled to a cab on an upper side of the cargo bed floor; and a lower coupling portion of the deck front pillar coupled to a cab on a lower side of the cargo bed floor. Patent Literature Patent Literature 1: JP2019-073197A. Brief Description of the Invention In the technique disclosed in Patent Literature 1, the stiffness of the sidewall coupling of the cargo bed to the cabin is increased by using front deck pillars that intersect the floor of the cargo bed and extend upwards and downwards. In such a configuration where such coupling members are provided on the upper side and lower side to increase stiffness, however, the problem arises that weight is increased. The present invention has been made with the aforementioned problems in mind, and the object of the present invention is to provide a vehicle cargo box structure that can avoid weight gain and can implement effective reinforcement. To achieve the above objectives, the present invention has, for example, the following configurations. (1) Reinforcement structure for vehicle cargo box, this reinforcement structure includes: a header board that configures a wall surface on the vehicle cargo box at the front side of the vehicle; a side wall that is positioned intersecting the header board; and a plate-shaped fixed mounting component connecting the header board and the side wall, wherein the fixed mounting component comprises: a first fixed mounting member provided on one side of the fixed mounting member and fixedly mounted on an upper portion of the headboard; and a second fixed mounting member provided on the other side of the fixed mounting member and fixedly mounted on a predetermined portion of the sidewall located on the front side of the vehicle relative to the headboard. (2) A reinforcement structure for a vehicle cargo box according to (1), wherein the fixed mounting component further includes a connecting member connecting the first fixed mounting member and the second fixed mounting member and which is inclined in the up-down direction of the vehicle towards the width of the vehicle. (3) A reinforcement structure for a vehicle cargo box according to (1) or (2), wherein the first mounting point at which the first fixed mounting member of the fixed mounting member is fixedly mounted on the upper part of the headboard, and the second mounting point at which the second fixed mounting member of the fixed mounting member is fixedly mounted on a predetermined part of the side wall are parallel to each other at a distance from each other in the front-rear direction of the vehicle. (4) A reinforcing structure for a vehicle cargo box according to any one of (1) to (3), wherein a first reinforcing member having a bent cross-sectional shape is provided along the width direction of the vehicle at the top of the headboard, and wherein a first fixed fixing member of the fixed fixing member is fixedly mounted on the first reinforcing member. (5) A reinforcing structure for a vehicle cargo box according to any one of (1) to (4), wherein a second reinforcing member is provided at a designated portion of the side wall, and wherein a second fixed mounting member of the fixed mounting member is fixedly mounted on the second reinforcing member. (6) A reinforcing structure for a vehicle cargo box according to any one of (1) to (5), wherein a third reinforcing member is provided on the side wall, and the third reinforcing member is located on the rear side of the vehicle relative to the headboard. (7) A reinforcement structure for a vehicle cargo box according to any one of (1) to (3), wherein a first reinforcement member having a bent cross-sectional shape is provided along the width direction of the vehicle at the top of the headboard, wherein a first fixed mounting member of the fixed mounting member is fixedly mounted on the first reinforcement member, wherein a second reinforcement member is provided at a predetermined portion of the side wall, wherein a second fixed mounting member of the fixed mounting member is fixedly mounted on the second reinforcement member, wherein a third reinforcement member is provided on the side wall, and the third reinforcement member is located on the rear side of the vehicle relative to the headboard, wherein the second reinforcement member includes a protruding piece extending inward in the width direction of the vehicle, and wherein the protruding piece is inserted between the first reinforcement member and the third reinforcement member. (8) Reinforcement structure for the vehicle cargo box according to (7), wherein the third mounting point where the protruding cut on the second reinforcing member and the third reinforcing member are fixedly mounted and located between the first fixed mounting member and the second fixed mounting member in the up-and-down direction of the vehicle. (9) Reinforcement structure for vehicle cargo box according to (2), wherein the connecting member is formed by a ridge line (ridge line is a line that delimits between inefficient areas) formed by bending the fixed mounting member in the direction of the thickness of the fixed mounting member.

[0001] According to the vehicle cargo box structure of the present invention, it is possible to provide a vehicle cargo box structure that can avoid increasing weight and can effectively implement reinforcement. Short Description of Image Figure 1 is a perspective view of a vehicle cargo box to which a reinforcement structure for a vehicle cargo box according to the present invention can be applied. Figure 2 is a perspective view of a vehicle cargo box to which a reinforcement structure for a vehicle cargo box according to the present invention can be applied thereto. Figure 3 is a perspective view showing the perimeter of the connecting and fixed members between the headboard and the side walls. Figure 4 is an enlarged view of the main section in Figure 3. Figure 5 is a perspective view showing the perimeter of the connecting and fixed sections between the headboard and the sidewalls with the headboard (2) omitted. Figure 6 is a top view showing the perimeter of the connecting and fixed members between the headboard and the sidewalls. Figure 7 is an enlarged view of the main section in Figure 6. Figure 8 is a perimeter view of the connecting and fixed sections between the headboard and sidewalls when viewed from the rear side. Figure 9 is a perspective view of the bracket. Figure 10 is a view of the bracket when viewed from the rear of the vehicle. Figure 11 is a view of the bracket when viewed from the width of the vehicle. Figure 12 is a view of the bracket when viewed from the top of the vehicle. Figure 13 is a partially cut side view of the connecting and fixed mounting section when viewed from the width of the vehicle. Complete Description of the Invention Description of Reference Numbers for vehicle cargo box headboard 2a top end of side wall 3a wheel arch 3b front side rear door (tailgate) floor panel bracket (fixed mounting component) first fixed mounting part 11a second fixed mounting part through hole 12a through hole connecting part first connecting part second connecting part first inclined part second inclined part third inclined part fourth inclined part fifth inclined part top rail (first reinforcing component) 30a basic section 30b front side reinforcement extension section (second reinforcement component) protruding section 41a protruding cut hole rear side reinforcement (third reinforcement component) protruding wall 51a protruding wall hole guard frame first back line second back line third back line fourth back line fifth back line sixth back line seventh back line eighth back line A connecting and fixed mounting part F1 exit style F2 inward force P1 first mounting point P2 second mounting point P3 third mounting point Next, a reinforcement structure for a vehicle cargo box according to an embodiment of the present invention will be described with reference to the drawings. In each drawing, the orientation of the vehicle's front-rear direction, the vehicle's left-right direction (vehicle width direction), and the vehicle's up-down direction, which are the directions when viewed from the perspective of the driver (passenger) of the vehicle, are indicated by arrows. For the brackets shown in Figures 9 to 12, the orientation of the brackets in the state in which they are fastened to the vehicle is shown. The types of vehicles to which the reinforcement structure for a vehicle cargo box according to this embodiment is applied are not particularly limited, and for example, this reinforcement structure may be applied to gasoline vehicles, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or the like. Figures 1 and 2 are each perspective views of a vehicle cargo box (1) to which a reinforcement structure for a vehicle cargo box according to the present invention can be applied. Since the vehicle cargo boxes (1) in Figures 1 and 2 have different details from each other, but have the same overall configuration as each other, the vehicle cargo boxes (1) are expressed by the same reference numbers. Each vehicle cargo box (1) is located behind the vehicle cab. This vehicle cargo box (1) includes a headboard (2) on the front side, a pair of side walls (3 and 3) on the left and right sides, a rear door (4) on the rear side, and a floor panel (5) on the lower side. This headboard (2) configures the wall surface on the vehicle cargo box (1) on the front side and extends in the left-right direction (vehicle width direction). A pair of side walls (3 and 3) are each positioned at an intersection with the headboard (2). Specifically, this pair of side walls (3 and 3) is connected to the left and right end portions of the headboard (2), particularly extending toward the rear side of the vehicle, and configures a wall surface on the vehicle cargo box (1) on the left and right sides. An arch for the wheel well (3a) is formed at the lower end portion of each side wall (3). The rear door (4) is connected to the rear end of the pair of side walls (3 and 3), and extends in a left-right direction. Floor panels (5) enclose the lower side of the space surrounded by a headboard (2), a pair of side walls (3 and 3), and a rear door (4). As described above, the vehicle cargo box (1) is a storage space that has a rectangular shape in top view, which is formed by a headboard (2), a pair of side walls (3 and 3), a rear door (4), and a floor panel (5). The upper rail (30) is fixedly attached to the upper part of the headboard (2) along the width direction of the vehicle by welding or the like. In the example in Figure 1, the guard frame (60) is fixedly attached to the upper part of the upper rail (30). The headboard (2), a pair of side walls (3), and a rear door (4) are fastened so that they stand on the floor panel (5). The lower end of the rear door (4) is provided to be able to rotate relative to the floor panel (5) as shown in Figure 1, and is configured so that cargo can easily enter and exit the vehicle cargo box (1). As shown in Figure 2, when a large amount of cargo is loaded into the cargo box of the vehicle (1) in the state where the rear door (4) is closed, an outward force (F1) from the inner side of the cargo box toward the outer side of the cargo box (the force from the center toward the outer side of the cargo box of the vehicle (1) can be considered at a right angle relative to one of the four sides respectively assumed) is applied to each of the headboard (2), the sidewall (3), and the rear door (4). Due to the outward force (F1), a load is applied to the connecting portion between each of the two end portions of the headboard (2) in the width direction of the vehicle and the inner surface of one of the pair of sidewalls (3 and 3) respectively in the width direction of the vehicle so as to open the connecting portion. For example, when a rope is stretched between a pair of side walls (3 and 3) to tie a pair of side walls (3 and 3) in the vehicle width direction, or a rope is laid between the headboard (2) and the rear door (4) to tie the headboard (2) and the rear door (4) in the front-rear direction, an inward force (F2) from the outer side of the cargo box toward the inner side of the cargo box will be applied. Due to the inward force (F2), a load is applied to the connecting portion between each of the two end portions of the headboard (2) in the vehicle width direction and the inner surface of one of the pair of side walls (3 and 3) respectively in the vehicle width direction so as to close the connecting portion. As described above, a load is easily applied to the connecting portion between the headboard (2) and each of the pair of side walls (3 and 3), and in particular, the upper end portion of the connecting portion is easily a weak portion. Therefore, in the vehicle cargo box (1) in this embodiment, the headboard (2) and each of the pair of side walls (3 and 3) are connected and reinforced by a plate-shaped bracket (fixed mounting member) (10) that is separate from the headboard (2) and the side walls (3). More specifically, the upper end portion of each of the two end portions of the headboard (2) in the width direction of the vehicle and one of the pair of side walls (3 and 3) are each connected and reinforced by one of the connecting and fixed mounting portions (A and A) respectively including a bracket (10) (FIGS. 3 to 8) which will be described later. In FIGS. 1 and 2, this bracket (10) is not shown. Figure 3 is a perspective view showing the perimeter of the connecting member and the fixed fastener (A) between the headboard (2) and the sidewall (3). Figure 4 is an enlarged view of the main section of Figure 3. Figure 5 is a perspective view showing the perimeter of the connecting member and the fixed fastener (A) between the headboard (2) and the sidewall (3) with the headboard (2) omitted. Figure 6 is a top view showing the perimeter of the connecting member and the fixed fastener (A) between the headboard (2) and the sidewall (3). Figure 7 is an enlarged view of the main section of Figure 6. Figure 8 is a perimeter view of the connecting member and the fixed fastener (A) between the headboard (2) and the sidewall (3) when viewed from the rear side. The connecting and fixed mounting members (A and A) on the left and right sides between the headboard (2) and the pair of side walls (3 and 3) are symmetrical in the width direction of the vehicle. Therefore, only the connecting and fixed mounting member (A) on the right side is shown and described in the following description. As shown in Figures 3 to 8, the connecting and fixed mounting part (A) is equipped with a bracket (10) which acts as a plate-shaped fixed mounting component connecting the headboard (2) with the side wall (3). The details of the bracket (10) will be described later. A top rail (30), which serves as the first reinforcing member whose cross-sectional shape is bent, is provided along the width direction of the vehicle at the upper end portion (2a) (upper portion) of the headboard (2). This top rail (30) is fixedly attached to the headboard (2) by welding or the like. This top rail (30) includes a base portion (30a) extending in an up-down direction along the front surface of the headboard (2), and an extension portion (30b) extending forward from the upper end portion of the base portion (30a). The front end portion of the extension portion (30b) has a hook shape that is bent downward and backward, and a rope or the like for fixing cargo placed in the cargo box of the vehicle (1) can be fixedly attached thereto. As described above, this top rail (30) has a cross-section with a shape that can be considered an inverted L.By placing the top rail (30) which acts as the first reinforcing component, the top end part (2a) of the headboard (2) is reinforced by the top rail. The side wall (3) is curved to protrude outward in the overall width direction of the vehicle, and includes a front side portion (3b) located closer to the front side of the vehicle than the headboard (2), and a rear side portion (3c) located closer to the rear side of the vehicle than the headboard (2). A front side brace (40) serving as a second reinforcing member is fixedly mounted on an inner side surface of the front side portion (3b) in the width direction of the vehicle serving as a predetermined portion of the side wall (3). A rear side brace (50) serving as a third reinforcing member is fixedly mounted on the side wall (3) at a location closer to the rear side of the vehicle than the headboard (2). The rear end portion of the front side reinforcement (40) is located closer to the rear side of the vehicle than the bracket (10), and is further located slightly closer to the rear side of the vehicle than the upper rail (30). The upper end portion of the rear end portion of the front side reinforcement (40) is formed by a protruding piece (41) extending inward in the width direction of the vehicle. This protruding piece (41) has the shape of a flat plate extending inward can be considered perpendicular to the front-rear direction of the vehicle (can be considered parallel to the up-down direction of the vehicle and the width direction of the vehicle). This protruding piece (41) is located at a position that can be considered the same as the position of the headboard (2) in the front-rear direction of the vehicle, and is located above the headboard (2). The front surface of the protruding piece (41) is adjacent to the rear surface of the bottom portion (30a) of the upper rail (30). The upper end portion of the front end portion of the rear side reinforcement (50) is formed by a protruding wall (51) extending inward in the width direction of the vehicle. This protruding wall (51) has the shape of a flat plate that extends inward can be considered perpendicular to the front-rear direction of the vehicle (can be considered parallel to the up-down direction of the vehicle and the width direction of the vehicle). The front surface of the protruding wall (51) is adjacent to the rear surface of the protruding cut portion (41). Thus, a protruding cut portion (41) of the front side reinforcement (40) is inserted between the rear surface of the bottom portion (30a) of the top rail (30) and the front surface of the protruding wall (51) of the rear side reinforcement (50) in the front-rear direction. Here, the protruding cut portion (41) is formed with a protruding cut hole (41a) that penetrates the protruding cut portion (41) in the front-rear direction, and the protruding wall (51) is provided with a protruding wall hole (51a) that penetrates the protruding wall (51) in the front-rear direction. In the state where the bottom portion (30a) of the top rail (30) is aligned with the protruding cut hole (41a) and the protruding wall hole (51a), the portions of the protruding cut hole (41a) and the protruding wall hole (51a) are welded, so that the top rail (30), the front side reinforcement (40), and the rear side reinforcement (50) are fixedly installed.Thus, the point where the top rail (30), the front side brace (40), and the rear side brace (50) are fixedly attached is called the third fixing point (P3). The method of fixed attachment at the third fixing point (P3) is not limited to welding, and fixing with bolts or the like can also be used. Figure 9 is a perspective view of the bracket (10). Figure 10 is a view of the bracket (10) when viewed from the rear side of the vehicle. Figure 11 is a view of the bracket (10) when viewed from the width of the vehicle. Figure 12 is a view of the bracket (10) when viewed from the top side of the vehicle. As shown in Figures 3 to 8 and Figures 9 to 12, the bracket (10) is a plate-shaped fixed mounting member comprising: a first fixed mounting member (11) provided on one side of the bracket (10) and fixedly mounted on an upper portion of the headboard (2); a second fixed mounting member (12) provided on the other side of the bracket (10) and fixedly mounted on a predetermined portion of the sidewall (3) located closer to the front side of the vehicle than the headboard (2); and a connecting member (13) connecting the first fixed mounting member (11) with the second fixed mounting member (12). In the fastened state, the first fixed mounting member (11) is located on the upper end side of the bracket (10), and extends perpendicularly to the up-down direction (parallel to the vehicle width direction and the front-back direction). The through hole (11a) extending in the up-down direction is formed and can be considered to be at the center of the first fixed mounting member (11). The upper surface of the first fixed mounting member (11) is adjacent to the upper part of the headboard (2), more specifically, the lower surface of the extension part (30b) of the upper rail (30). The first fixed mounting member (11) is fixedly fixed to the lower surface of the extension part (30b) of the upper rail (30) through the through hole (11a) by welding or the like. Thus, the point where the first fixed mounting member (11) of the bracket (10) is fixedly fixed to the extension part (30b) of the upper rail (30) (the upper part of the headboard (2)) is referred to as the first fixing point (P1).The fixed mounting method at the first mounting point (P1) is not limited to welding, and bolting or similar mounting can be used. In the bound state, the second fixed mounting member (12) is located on the lower end side on the bracket (10), and the elongation can be considered perpendicular to the vehicle width direction (can be considered parallel to the up-down direction and the front-rear direction). Strictly speaking, the shown second fixed mounting member (12) is slightly tilted outward in the vehicle width direction to the lower side, and the stress distribution effect is enhanced. The through hole (12a) extending in the vehicle width direction can be considered to be formed at the center of the second fixed mounting member (12). The outer side surface of the second fixed mounting member (12) in the vehicle width direction is adjacent to a predetermined portion of the side wall (3) located closer to the front side than the headboard (2), more specifically, the inner side surface, in the vehicle width direction, of the front side reinforcement (40) provided in the predetermined portion of the side wall (3).The second fixed mounting member (12) is fixedly mounted on the inner side surface of the front side reinforcement (40) in the width direction of the vehicle through the through hole (12a) by welding or the like. Thus, the point where the second fixed mounting member (12) of the bracket (10) is fixedly mounted on the front side reinforcement (40) which acts as the second reinforcing member is referred to as the second mounting point (P2). The method of fixedly mounting at the second mounting point (P2) is not limited to welding, and mounting by bolts or the like may be used. The connecting member (13) is inclined in the vehicle up-down direction toward the vehicle width between the first fixed mounting member (11) and the second fixed mounting member (12). In this embodiment, this connecting member (13) is inclined outward in the vehicle width direction and downward. As shown in Figure 11, the width of the connecting member (13) in the front-rear direction is shaped to increase toward the lower side. In more detail, this connecting member (13) mainly protrudes forward toward the lower side. Therefore, the second fixed mounting member (12) connected to the lower end of the connecting member (13) protrudes forward more than the first fixed mounting member (11) as a whole. As a result, the formed through-hole (12a) can be considered to be at the center of the second fixed mounting member (12) and the second mounting point (P2) formed by the provided through-hole (12a) is located below and in front of the provided through-hole (11a) can be considered to be at the center of the first fixed mounting member (11) and the first mounting point (P1) formed by the through-hole (11a). That is, as shown in Figure 11, the first mounting point (P1) and the second mounting point (P2) are displaced from each other by a distance (L1) in the front-back direction, and displaced from each other by a distance (L2) in the up-down direction. As shown in Figure 8 and the like, the third mounting point (P3), which is the point where the top rail (30), the front side brace (40), and the rear side brace (50) are fixedly mounted, is located between the first fixed mounting portion (11) and the second fixed mounting portion (12) of the bracket (10) in the vehicle up-and-down direction. Consequently, this third mounting point (P3) is located between the first mounting point (P1) and the second mounting point (P2) in the vehicle up-and-down direction. The connecting part (13) includes the first connecting part (14) which is placed on the upper side, and the second connecting part (15) which is placed on the lower side. This first connecting member (14) is connected to the first fixed mounting member (11). This first connecting member (14) has a plate shape that can be considered flat which is tilted downwards from the first fixed mounting member (11) towards the outside in the direction of the width of the vehicle. A second connecting member (15) connects the first connecting member (14) and the second fixed mounting member (12) to each other. Similar to the first connecting member (14), this second connecting member (15) is inclined downward toward the outer side in the vehicle width direction, but unlike the first connecting member (14), this second connecting member (15) is formed with a plurality of ridge lines (71 to 78) formed by bending the bracket (10) in the thickness direction. Namely, this second connecting member (15) includes a plurality of inclined sections (21 to 25) bounded by a plurality of ridge lines (71 to 78) and tilted in a direction that can be considered to be in the same direction. The plurality of inclined sections (21 to 25) are polyhedral structures where the inclination angles of these plurality of inclined sections (21 to 25) are different from each other, the orientation of the inclination, the shape, and the like, and include a first inclined section (21), a second inclined section (22), a third inclined section (23), a fourth inclined section (24), and a fifth inclined section (25). The first inclined member (21) is located at the top of the second connecting member (15) and is connected to the lower end of the first connecting member (14). The second inclined member (22) is located at the center of the second connecting member (15). The third inclined section (23) is located in front of the second inclined section (22). The fourth inclined section (24) is located behind the second inclined section (22). The fifth inclined member (25) is located at the bottom of the second connecting member (15) and is connected to the upper end of the second fixed mounting member (12). The first dorsal line (71) extends along the vehicle's front-rear direction, and delimits the first inclined section (21) and the second inclined section (22). The second ridge line (72) is connected to the first ridge line (71), and extends upwards and inwards in the width direction of the vehicle towards the front side. This second ridge line (72) delimits the first inclined section (21) and the third inclined section (23). The third ridge line (73) is connected to the first ridge line (71), and extends upwards and inwards in the width direction of the vehicle towards the rear side. This third ridge line (73) delimits the first inclined section (21) and the fourth inclined section (24). The fourth ridge line (74) is connected to the first ridge line (71) and the second ridge line (72), and extends outward in the width direction of the vehicle towards the underside. This fourth ridge line (74) delimits the second sloping section (22) and the third sloping section (23). The fifth dorsal line (75) is connected to the first dorsal line (71) and the third dorsal line (73), and extends outward in the width direction of the vehicle towards the underside. This fifth dorsal line (75) can be considered parallel to the fourth dorsal line (74). This fifth dorsal line (75) delimits the second inclined section (22) and the fourth inclined section (24). The sixth dorsal line (76) extends along the vehicle's front-rear direction and delimits the second inclined section (22) and the fifth inclined section (25). This sixth dorsal line (76) can be considered parallel to the first dorsal line (71). The seventh dorsal line (77) is connected to the fourth dorsal line (74) and the sixth dorsal line (76), and extends downward and outward in the width direction of the vehicle towards the front side. This seventh dorsal line (77) delimits the third inclined section (23) and the fifth inclined section (25). The eighth dorsal line (78) is connected to the fifth dorsal line (75) and the sixth dorsal line (76), and extends downward and outward in the width direction of the vehicle towards the rear side. This eighth dorsal line (78) delimits the fourth sloping section (24) and the fifth sloping section (25). Therefore, a second inclined member (22) having a shape that can be considered as a rectangle in a side view is disposed at the center of the second connecting member (15), and the first, third, fourth, and fifth inclined members (21, 23, 24, and 25) each having a shape that can be considered as a trapezoid in a side view are disposed around the second inclined member (22). The second inclined member (22) at the center between the first to fifth inclined members (21 to 25) has a shape that is most prominent in the thickness direction of the bracket (10) (outward in the width direction of the vehicle). As described above, the connecting member (13) is provided with a bent structure that includes a plurality of ridge lines (71 to 78), so that the rigidity of the bracket (10) can be increased. Here, as described above with reference to Figure 2, when a large amount of cargo is loaded into the cargo box of the vehicle (1), an outward force (F1) from the inner side of the cargo box toward the outer side of the cargo box is applied to each of the headboard (2), the pair of side walls (3 and 3), and the rear door (4). By the outward force (F1), the headboard (2) is pushed toward the front side of the vehicle, and the side walls (3) are pushed outward in the width direction of the vehicle. In this case, a force to open the connecting member is applied to the connecting member between each of the two end parts of the headboard (2) in the width direction of the vehicle and the inner side surface of one of the pair of side walls (3 and 3) respectively in the width direction of the vehicle. Similarly, as described above with reference to Figure 2, when a rope is placed between the headboard (2) and the rear door (4) to fasten the headboard (2) and the rear door (4) in the front-rear direction, an inward force (F2) from the outer side of the cargo box toward the inner side of the cargo box is applied. Due to the inward force (F2), a force to close the connecting member is applied to the connecting member between each of the two end parts of the headboard (2) in the vehicle width direction and the inner side surface of one of the pair of side walls (3 and 3) respectively in the vehicle width direction. Figure 13 is a partially cut side view of the connecting member and the fixed mount (A) when viewed from the vehicle width direction.When an inward force (F2) as described above is applied, as indicated by the arrow in Figure 13, a force (F3) causing a deformation such as lifting acts particularly on the extension portion (30b) of the upper rail (30) where a rope hook or the like can be attached. Therefore, in this embodiment, the bracket (10) connecting the headboard (2) with the sidewall (3) is formed, and the connecting part is reinforced. Specifically, the bracket (10) in this embodiment includes: a first fixed mounting member (11) provided on one side of the bracket (10) and fixedly mounted on an upper part of the headboard (2) (upper rail (30)); and a second fixed mounting member (12) provided on the other side of the bracket (10) and fixedly mounted on a predetermined portion of the sidewall (3) (front side brace (40)) located closer to the front side of the vehicle than the headboard (2). That is, the first fixed mounting member (11) and the second fixed mounting member (12) of the bracket (10) are a displacement distance from each other in the front-rear direction of the vehicle. Therefore, on the first fixed mounting member (11) and the second fixed mounting member (12), part of the external force can be accepted as a shear force, and the load on the bracket (10) can be reduced. Since the second fixed mounting part (12) is located closer to the front side of the vehicle than the headboard (2), the bracket (10) is located outside the storage area of ​​the vehicle cargo box (1), and the storage volume inside the vehicle cargo box (1) can be increased. Because the bracket (10) has a plate shape, its weight can be reduced. The bracket (10) further includes a connecting member (13) that connects the first fixed mounting member (11) with the second fixed mounting member (12) and that is inclined in the up-and-down direction of the vehicle toward the width of the vehicle. Therefore, the load on the bracket (10) can be distributed. As indicated by the dashed line (D) in Figure 8, if a form is used in which the bracket (10) does not include an inclined connecting member (13) and the first fixed mounting member (11) and the second fixed mounting member (12) are connected vertically, the load is concentrated in the corner portion connecting the first fixed mounting member (11) with the second fixed mounting member (12). In this case, it is necessary to increase the strength of the bracket (10) itself, and increasing the thickness of the plate, adding a reinforcing protrusion shape, or the like causes an increase in weight and an increase in cost, so that such a form is not preferred. Since the first fixed mounting member (11) and the second fixed mounting member (12) connected by the connecting member (13) are offset from each other not only in the front-rear direction of the vehicle but also in the up-down direction of the vehicle and the width direction of the vehicle, the positional relationship between the first fixed mounting member (11) (first mounting point (P1)) and the second fixed mounting member (12) (second mounting point (P2)) is three-dimensional. Therefore, the stress generated in the first fixed mounting member (11) (first mounting point (P1)) and the second fixed mounting member (12) (second mounting point (P2)) is easily distributed in the front-rear direction, the up-down direction, and the width direction of the vehicle. As a result, the stress distribution function of the bracket (10) can be further improved, and the deformation prevention effect can be enhanced. The first mounting point (P1) where the first fixed mounting member (11) of the bracket (10) is fixedly mounted on the upper part of the headboard (2) (upper rail (30)), and the second mounting point (P2) where the second fixed mounting member (12) of the bracket (10) is fixedly mounted on a predetermined portion of the sidewall (3) (front side brace (40)) are offset from each other in the front-rear direction of the vehicle. Therefore, external forces can be efficiently received. In particular, as shown in Figure 13, when a force (F3) causing deformation such as a lifting force acts on the extension portion (30b) of the upper rail (30), the load on the bracket (10) can be reduced. If the first mounting point (P1) and the second mounting point (P2) are at the same position in the front-rear direction of the vehicle, the line connecting the first mounting point (P1) and the second mounting point (P2) is perpendicular to the force (F3) toward the rear side of the vehicle, and it is difficult to accept the load efficiently. An upper rail (30) (first reinforcing member) whose cross-sectional shape is a bent shape is provided along the width direction of the vehicle at the upper part of the headboard (2), and the first fixed mounting member (11) of the bracket (10) is fixedly installed on the upper rail (30). Therefore, the upper part of the headboard (2), which is easily a weak part, can be reinforced by the presence of an upper rail (30) next to the bracket (10). A front side brace (40) (second reinforcing member) is provided at a predetermined portion of the side wall (3), and a second fixed mounting member (12) of the bracket (10) is fixedly mounted on the front side brace (40). Therefore, a predetermined portion of the headboard (2), which can easily become a weak member, can be reinforced by the front side brace (40) in addition to the bracket (10). On the side wall (3), the rear side reinforcement (50) (third reinforcing component) is provided closer to the rear side of the vehicle than the head board (2). Therefore, the side wall (3) can be further reinforced. The front side reinforcement (40) includes a protruding piece (41) extending inward in the width direction of the vehicle, and the protruding piece (41) is inserted between the upper rail (30) and the rear side reinforcement (50). Therefore, the front side reinforcement (40) is fixedly fixed on the upper rail (30) and the rear side reinforcement (50) by being inserted between them in addition to being fixedly fixed on the upper rail (30) by the bracket (10), so that the load on the bracket (10) can be distributed. The third mounting point (P3) where the protruding pieces (41) of the front side brace (40) and the rear side brace (50) are fixedly mounted is located between the first fixed mounting part (11) (first mounting point (P1)) and the second fixed mounting part (12) (second mounting point (P2)) of the bracket (10) in the vehicle up-and-down direction. Therefore, the load can be distributed through the three-point mounting, and the three mounting points (P1, P2, and P3) are compactly placed. Because these three mounting points (P1, P2, and P3) are directly connected by the bracket (10) and the three reinforcing members (top rail (30), front side brace (40), and rear side brace (50)), the rigidity of the entire connecting and fixed mounting part (A) can be increased. In the reinforcement structure according to the embodiment described above, three three-dimensional mounting points (P1, P2, and P3) are placed in such a way that the displacement distance in the front-rear direction, the up-down direction, and the width direction of the vehicle, so that the distribution function for external forces in any direction can be increased, and the deformation prevention effect can be enhanced. The connecting member (13) of the bracket (10) is formed with ridge lines (71 to 78) formed by bending the bracket (10) in the thickness direction. As a result, the rigidity of the bracket (10) can be increased. Although embodiments of the present invention have been described above, the present invention may be appropriately modified within the scope of its technical concept. For example, in the above embodiment, a structure is used wherein the connecting member (13) of the bracket (10) is provided with first to fifth inclined members (21 to 25), but the number of these inclined members is not limited thereto, and the inclination angle, shape, and the like of each inclined member are also not limited to those depicted in the drawings.

Claims

1. A reinforcement structure for a vehicle cargo box, the reinforcement structure includes: a headboard that configures a wall surface on the vehicle cargo box at the front side of the vehicle; a side wall disposed intersecting with the headboard; and a plate-shaped fixed mounting member connecting the headboard and the side wall, wherein the fixed mounting member includes: a first fixed mounting member provided on one side of the fixed mounting member and fixedly mounted on an upper portion of the headboard; and a second fixed mounting member provided on the other side of the fixed mounting member and fixedly mounted on a predetermined portion of the side wall located on the front side of the vehicle relative to the headboard.

2. A reinforcement structure for a vehicle cargo box according to claim 1, wherein said fixed mounting member further includes a connecting member connecting the first fixed mounting member and the second fixed mounting member and being inclined in the up-and-down direction of the vehicle towards the width of the vehicle.

3. A reinforcement structure for a vehicle cargo box according to claim 1 or 2, wherein the first mounting point at which the first fixed mounting member of the fixed mounting member is fixedly mounted on an upper portion of the headboard, and the second mounting point at which the second fixed mounting member of the fixed mounting member is fixedly mounted on a predetermined portion of the side wall are a displacement distance from each other in the front-rear direction of the vehicle.

4. A reinforcing structure for a vehicle cargo box according to any one of claims 1 to 3, wherein a first reinforcing member having a transverse cross-sectional shape is a bent shape provided along the width direction of the vehicle at the top of the headboard, and a first fixed fixing member of the fixed fixing member is fixedly mounted on the first reinforcing member.

5. A reinforcing structure for a vehicle cargo box according to any one of claims 1 to 4, wherein a second reinforcing member is provided at a predetermined portion of the side wall, and a second fixed mounting member of the fixed mounting member is fixedly mounted on the second reinforcing member.

6. A reinforcing structure for a vehicle cargo box according to any one of claims 1 to 5, wherein a third reinforcing member is provided on the side wall, said third reinforcing member being located on the rear side of the vehicle relative to the headboard.

7. A reinforcement structure for a vehicle cargo box according to any one of claims 1 to 3, wherein a first reinforcement member having a cross-sectional shape of a bent shape is provided along the width direction of the vehicle at an upper portion of the headboard, a first fixed mounting member of the fixed mounting member is fixedly mounted on the first reinforcement member, a second reinforcement member is provided at a predetermined portion of the side wall, a second fixed mounting member of the fixed mounting member is fixedly mounted on the second reinforcement member, a third reinforcement member is provided on the side wall, this third reinforcement member is located on the rear side of the vehicle relative to the headboard, the second reinforcement member includes a protruding piece extending inward in the width direction of the vehicle, and the protruding piece is inserted between the first reinforcement member and the third reinforcement member.

8. A reinforcing structure for a vehicle cargo box according to claim 7, wherein the third fixing point wherein the protruding cutout of the second reinforcing member and the third reinforcing member are fixedly mounted 5 is located between the first fixed fixing member and the second fixed fixing member in the up-and-down direction of the vehicle.

9. A reinforcement structure for a vehicle cargo box according to claim 2, wherein the connecting member is formed by a ridge line formed by bending the fixed fixing member in the thickness direction of the fixed fixing member.

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