JP6484190B2 - Bumper reinforcement - Google Patents

Description

  The present invention relates to bumper reinforcement that absorbs the collision energy of a vehicle.

  Conventionally, bumper reinforcement that absorbs collision energy has been used in vehicles in order to ensure safety in the event of a vehicle collision.

  Specifically, for example, Patent Document 1 listed below proposes bumper reinforcement composed of a long cylindrical body that extends in the width direction of the vehicle body at the front of the vehicle body. In the bumper reinforcement described in Patent Document 1, the center in the longitudinal direction of the cylinder is the upper surface and the lower surface, and the front surface (collision surface) and the rear surface in the front-rear direction of the vehicle body that intersects the upper surface and the lower surface at right angles or inclines Anti-collision surface) in the front-rear direction of the vehicle body, and a so-called hat-shaped closed cross-sectional shape having outward flanges on the upper and lower surfaces.

  Further, in Patent Document 1, a material having a hat-shaped open cross-sectional shape shown in FIG. 1 of Patent Document 1 (hereinafter referred to as “hat-shaped open cross-sectional material”) and a flat cross-section using general-purpose dynamic finite element method analysis software. Resistance of a hat-shaped closed cross-section member (hereinafter referred to as a “hat member”) assembled by spot welding by overlapping a material (hereinafter also referred to as a plate-shaped material) on the outward flange at the edge of the hat-shaped open cross-section material. Bending performance and crushing performance (impact energy absorption performance) are obtained by analysis.

  Furthermore, in Patent Document 1, when the impactor is caused to collide from the hat-shaped open cross-section material side, that is, in the case shown in FIGS. 2 and 3 of Patent Document 1, a hat member (hereinafter referred to as “forward hat cross-section member”), a plate Bending resistance and impact energy absorption performance of the hat member (hereinafter referred to as “reverse hat cross-section member”) when the impactor is collided from the side of the sheet material is investigated by three-point bending collision analysis and crush analysis .

  According to the result shown by the graph in FIG. 4 of Patent Document 1, the reverse hat cross-section member has higher bending strength than the forward hat cross-section member because of its high resistance to deformation of the cross-sectional shape at the time of collision.

Japanese Patent No. 5168023

  However, according to the result shown by the graph in FIG. 5 of Patent Document 1, the plate-shaped material is not joined to the reverse hat cross-section member, and deformation occurs from the hat top side of the hat-shaped open cross-section material. It cannot be said that the impact energy absorption performance is better than that of the hat cross-section member.

  Therefore, the present invention has been made in view of the above-described points, and by suppressing the collapse of the so-called reverse hat type closed cross-sectional shape, it is possible to improve the peak load and the amount of energy absorption per unit mass. The challenge is to provide possible bumper reinforcement.

The bumper reinforcement according to claim 1, which has been made in order to solve this problem, is provided with a reinforcing body inside a closed cross section formed from a long box and a long front plate, The bumper reinforcement is installed in a direction in which the face plate side is the load input side, and the reinforcing body is opposed to the first upper surface, the first lower surface, and the first rear surface of the elongated box. The first rear surface is provided at least on the first rear surface of the elongated box body, and the elongated box body is provided opposite to the first front surface with the first front surface open. And the first upper surface extending from the upper side of the first rear surface toward the first front surface, and extending from the lower side of the first rear surface toward the first front surface and the first upper surface. The first lower surface provided opposite to the first upper surface and the first upper surface of the first upper surface. A first upper flange extending upward from the surface side; and a first lower flange extending downward from the first front surface side of the first lower surface; The face plate fixes the first upper flange and the first lower flange of the elongated box, and the reinforcing body extends obliquely upward from the second rear surface and the upper side of the second rear surface. An upper inclined surface, a lower inclined surface extending obliquely downward from a lower side of the second rear surface, a second upper surface extending from an upper side of the upper inclined surface, and the lower inclined surface The second lower surface provided from the lower side and provided opposite to the second upper surface is provided in the elongated box, and the second rear surface of the reinforcing body is formed in the elongated shape. Opposing to the first rear surface of the box and being fixed to the first rear surface of the elongated box, the second upper surface of the reinforcing body has the elongated shape. The second lower surface of the reinforcing body is opposed to the first upper surface of the elongated box body in the vicinity of the first upper surface of the body, and the second lower surface of the reinforcing body is the first surface of the elongated box body in the vicinity of the first lower surface of the elongated box body. wherein the opposed to Rukoto to 1 lower surface.

Bumper reinforcement according to claim 2 is the bumper reinforcement according to claim 1, before Symbol reinforcement is inner in the elongated box body in the longitudinal direction center of the front Symbol elongate box member It is provided.

  The bumper reinforcement according to claim 3 is the bumper reinforcement according to claim 2, wherein the reinforcing body includes a second front surface extending from the second upper surface and the second lower surface, and the reinforcement is provided. The second front surface of the body is opposed to the first front surface of the elongated box.

  The bumper reinforcement according to a fourth aspect is the bumper reinforcement according to the second aspect, wherein the reinforcing body includes a second upper flange extending upward from the second upper surface, and the second A second lower flange extending downward from the lower surface, wherein the second upper flange of the reinforcing body is sandwiched between the first upper flange of the elongated box and the elongated front plate The second lower flange of the reinforcing body is attached in a state of being sandwiched between the first lower flange of the elongated box and the elongated front plate.

In the bumper reinforcement according to claim 1 and 2 , a reinforcing body is provided inside a closed cross section formed from a long box and a long front plate, and the long front plate side is a load input side. Installed in the direction. Therefore, the bumper reinforcement according to the first and second aspects of the invention has a so-called reverse hat type closed cross-sectional shape. Furthermore, in the bumper reinforcement according to claims 1 and 2 , the reinforcing body is provided so as to be opposed to the first upper surface, the first lower surface, and the first rear surface of the long box body, and is at least long. It is fixed to the first rear surface of the box-like box. With such a configuration, when a collision occurs on the long front plate side, the first upper surface and the first lower surface of the long box body are deformed to the inside of the long box body, and become a reinforcing body. Abut. That is, in the long box, the first upper surface and the first lower surface of the long box are deformed to the inside of the long box, but the deformation is hindered by the reinforcing body, so that the collapse of the cross section is suppressed. Is done. Therefore, the bumper reinforcement according to the first and second aspects of the invention can improve the peak load per unit mass and the amount of energy absorption by suppressing the collapse of the cross-section of the so-called reverse hat type closed cross section. is there.

In the bumper reinforcement according to the first and second aspects of the invention, the first front surface of the long box is opened, while the first upper flange and the first lower flange of the long box are long in front. The face plate is fixed. Therefore, the bumper reinforcement according to the first and second aspects of the invention has a so-called reverse hat type closed cross-sectional shape.

Furthermore, the bumper reinforcement of the invention according to claims 1 and 2 includes a reinforcing body provided in the long box at the center in the long direction of the long box, and the second rear surface of the reinforcing body. Is opposed to the first rear surface of the elongated box and is fixed to the first rear surface of the elongated box, and the second upper surface of the reinforcing body is elongated in the vicinity of the first upper surface of the elongated box. Opposing to the first upper surface of the box body, the second lower surface of the reinforcing body opposes the first lower surface of the elongated box body in the vicinity of the first lower surface of the elongated box body.

With such a configuration, when a collision occurs in the long front plate at the center in the long direction of the long box, the first of the reinforcing body of the first upper surface and the first lower surface of the long box. The part located in the vicinity of 2 upper surface and 2nd lower surface deform | transforms into the inside of an elongate box, and contact | abuts to the 2nd upper surface and 2nd lower surface of a reinforcement body. That is, at the center in the longitudinal direction of the long box, the first upper surface and the first lower surface of the long box are deformed to the inside of the long box. Since it is inhibited by the second lower surface, the collapse of the cross section is suppressed. Therefore, the bumper reinforcement according to the first and second aspects of the invention can improve the peak load per unit mass and the amount of energy absorption by suppressing the collapse of the cross-section of the so-called reverse hat type closed cross section. is there.

  In the bumper reinforcement of the invention according to claim 3, the reinforcing body includes a second front surface extending from the second upper surface and the second lower surface, and the second front surface of the reinforcing body is the first of the long box body. Opposite the front. With such a configuration, the second upper surface and the second lower surface of the reinforcing body are not easily deformed. Therefore, the bumper reinforcement of the invention according to claim 3 has a high effect of inhibiting the inner deformation of the long box.

  In the bumper reinforcement of the invention according to claim 4, the reinforcing body includes a second upper flange extending upward from the second upper surface, and a second lower side extending downward from the second lower surface. The second upper flange of the reinforcing body is attached in a state sandwiched between the first upper flange of the elongated box and the long front plate, and the second lower flange of the reinforcing body is elongated. It is attached in a state of being sandwiched between the first lower flange of the box and the long front plate. With such a configuration, the second upper surface and the second lower surface of the reinforcing body are not easily deformed. Therefore, the bumper reinforcement of the invention according to claim 4 has a high effect of inhibiting the inner deformation of the long box.

It is a perspective view showing the bumper reinforcement which concerns on this embodiment. It is a perspective view showing the elongate box of the bumper reinforcement. It is a top view showing the bumper reinforcement. It is a perspective view showing the elongate box body and reinforcement body of 1st Embodiment. It is sectional drawing which cut | disconnected the elongate box of 1st Embodiment, the elongate front board, and the reinforcement body by the line BB of FIG. It is sectional drawing which cut | disconnected the elongate box of 1st Embodiment, the elongate front board, and the reinforcement body by the line BB of FIG. 1, Comprising: The three-point bending collision analysis result of 1st Embodiment was represented. FIG. It is a figure showing the result (relationship of a deformation amount, a load, and energy absorption amount) of the three-point bending collision analysis of 1st Embodiment. It is a perspective view showing the elongate box and reinforcement body of 2nd Embodiment. It is sectional drawing which cut | disconnected the elongate box of 2nd Embodiment, the elongate front plate, and the reinforcement body by the line BB of FIG. It is sectional drawing which cut | disconnected the elongate box of 2nd Embodiment, the elongate front board, and the reinforcement body by the line BB of FIG. 1, Comprising: The three-point bending collision analysis result of 2nd Embodiment was represented. FIG. It is a figure showing the result (relationship of a deformation amount, a load, and energy absorption amount) of the three-point bending collision analysis of 2nd Embodiment. It is sectional drawing which cut | disconnected the elongate box of the comparative example, and the elongate front board by the line BB of FIG. It is sectional drawing which cut | disconnected the elongate box of the comparative example and the elongate front board by the line BB of FIG. 1, Comprising: It is the figure showing the result of the three-point bending collision analysis of a comparative example. It is the figure which compared the three-point bending collision analysis result (peak load / mass ratio) with the comparative example, 1st Embodiment, and 2nd Embodiment. It is the figure which compared the three-point bending collision analysis result (energy absorption amount / mass ratio) with the comparative example, 1st Embodiment, and 2nd Embodiment. It is sectional drawing which cut | disconnected the example (a long box, a long front board, and a reinforcement body) of 1st Embodiment by the line BB of FIG.

[1. Common configuration of the first embodiment and the second embodiment]
The bumper reinforcement according to the present invention will be described in detail with reference to the drawings based on a specific embodiment. As shown in FIG. 1, the bumper reinforcement 1 according to the present embodiment has a curved shape in which both ends in the longitudinal direction are retreated, and includes a long box 2 and a long front plate 3. The long box 2 and the long front plate 3 are made of steel.

  As shown in FIG. 2, the elongated box 2 includes a rear surface 4, an upper surface 5, a lower surface 6, an upper flange 7, a lower flange 8, and an opening front surface 9.

  In the elongate box 2, the opening front surface 9 is opened. The rear surface 4 is provided to face the opening front surface 9. The upper surface 5 extends from the upper side of the rear surface 4 toward the opening front surface 9. The lower surface 6 extends from the lower side of the rear surface 4 toward the opening front surface 9 and is provided to face the upper surface 5. The upper flange 7 extends upward from the opening front surface 9 side of the upper surface 5. A lower flange 8 extends downward from the opening front 9 side of the lower surface 6.

  As shown in FIGS. 1 and 2, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box 2. Spot welding is used for the joining.

  In the bumper reinforcement 1 according to the present embodiment, as shown in FIG. 3, the reinforcing body 10 is installed in the long box 2 at the center A in the long direction of the long box 2. The reinforcing body 10 is made of steel in the same manner as the long box 2 and the long front plate 3.

  In the bumper reinforcement 1 according to the present embodiment, two reinforcing bodies 10 that are different modes are used. Hereinafter, the bumper reinforcement 1 according to the present embodiment will be described in accordance with the first embodiment and the second embodiment according to the aspect of the reinforcing body 10. In the description of the first embodiment and the second embodiment, portions common to the bumper reinforcement 1 according to the present embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[2. First Embodiment]
First, the first embodiment will be described. In the first embodiment, as shown in FIG. 4, the reinforcing body 10 </ b> A is installed in the long box 2 at the center A in the long direction of the long box 2.

  As shown in FIGS. 4 and 5, the reinforcing body 10 </ b> A is a hollow body, and includes a rear surface 21, an upper inclined surface 22, a lower inclined surface 23, an upper surface 24, a lower surface 25, and a front surface 26.

  In the reinforcing body 10 </ b> A, the upper inclined surface 22 extends obliquely upward from the upper side of the rear surface 21. A lower inclined surface 23 extends obliquely downward from the lower side of the rear surface 21. The upper surface 24 extends from the upper side of the upper inclined surface 22. A lower surface 25 extends from the lower side of the lower inclined surface 23 and is provided to face the upper surface 24. A front surface 26 extends from the upper surface 24 and the lower surface 25.

  As shown in FIG. 5, the rear surface 21 of the reinforcing body 10 </ b> A faces the rear surface 4 of the long box body 2 and is fixed to the rear surface 4 of the long box body 2 by spot welding at the welding point P <b> 1. Is done. The upper side of the upper inclined surface 22 of the reinforcing body 10 </ b> A is located in the vicinity of the upper surface 5 of the long box 2. The lower side of the lower inclined surface 23 of the reinforcing body 10 </ b> A is located near the lower surface 6 of the long box 2. The upper surface 24 of the reinforcing body 10 </ b> A faces the upper surface 5 of the long box body 2 in the vicinity of the upper surface 5 of the long box body 2. The lower surface 25 of the reinforcing body 10 </ b> A faces the lower surface 6 of the long box body 2 in the vicinity of the lower surface 6 of the long box body 2. The front surface 26 of the reinforcing body 10 </ b> A faces the opening front surface 9 of the long box 2.

  As described above, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box 2. For the joining, spot welding at welding points P2 and P3 is used.

Finite element analysis software (trade name: PAM-CRASH 64-Bit Solvers
2012. 1), the three-point bending collision analysis of the first embodiment was performed. In the three-point bending collision analysis, a collision load was applied to the elongated front plate 3 at the longitudinal center A of the elongated box 2.

  According to the analysis result, in the cross section cut at the longitudinal center A of the long box 2, when the amount of deformation becomes maximum, as shown in FIG. 6, the upper surface 5 of the long box 2. Among them, a portion 27 facing the upper surface 24 of the reinforcing body 10A is deformed inside the elongated box 2 and is in contact with the upper surface 24 of the reinforcing body 10A. A portion 28 of the lower surface 6 of the elongated box 2 that faces the lower surface 25 of the reinforcing body 10A is deformed inside the elongated box 2 and is in contact with the lower surface 25 of the reinforcing body 10A. On the other hand, the upper surface 24 and the lower surface 25 of the reinforcing body 10A are hardly deformed in the vertical direction.

  As shown in FIG. 7, in the first embodiment, the load [kN] increases in proportion to the first predetermined deformation amount [mm], and after the first predetermined deformation amount [mm], The load [kN] is substantially constant. Therefore, the energy absorption amount [kJ] increases so as to be approximately linearly proportional to the deformation amount [mm].

[3. Second Embodiment]
Next, a second embodiment will be described. In the second embodiment, as shown in FIG. 8, the reinforcing body 10 </ b> B is installed in the long box 2 at the center A in the long direction of the long box 2.

  As shown in FIGS. 8 and 9, the reinforcing body 10 </ b> B has a substantially U-shaped cross section, and includes a rear surface 41, an upper inclined surface 42, a lower inclined surface 43, an upper surface 44, a lower surface 45, and an upper flange 46. And a lower flange 47.

  In the reinforcing body 10 </ b> B, the upper inclined surface 42 extends obliquely upward from the upper side of the rear surface 41. A lower inclined surface 43 extends obliquely downward from the lower side of the rear surface 41. The upper surface 44 extends from the upper side of the upper inclined surface 42. A lower surface 45 extends from the lower side of the lower inclined surface 43 and is provided to face the upper surface 44. An upper flange 46 extends upward from the upper surface 44. A lower flange 47 extends upward from the lower surface 45.

  As shown in FIG. 9, the rear surface 41 of the reinforcing body 10B faces the rear surface 4 of the long box body 2 and is fixed to the rear surface 4 of the long box body 2 by spot welding at the welding point P4. Is done. The upper side of the upper inclined surface 42 of the reinforcing body 10B is located in the vicinity of the upper surface 5 of the elongated box 2. The lower side of the lower inclined surface 43 of the reinforcing body 10B is located in the vicinity of the lower surface 6 of the elongated box 2. The upper surface 44 of the reinforcing body 10 </ b> B faces the upper surface 5 of the elongated box 2 in the vicinity of the upper surface 5 of the elongated box 2. The lower surface 45 of the reinforcing body 10B faces the lower surface 6 of the long box 2 in the vicinity of the lower surface 6 of the long box 2. The upper flange 46 of the reinforcing body 10B is attached in a state of being sandwiched between the upper flange 7 of the long box 2 and the long front plate 3, and is subjected to spot welding at the welding point P5 to thereby form a long box. 2 on the upper flange 7 and the long front plate 3. The lower flange 47 of the reinforcing body 10B is attached in a state of being sandwiched between the lower flange 8 of the elongated box 2 and the elongated front plate 3, and is elongated by spot welding at the welding point P6. It is fixed to the lower flange 8 of the box 2 and the long front plate 3.

  As described above, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box body 2 via the upper flange 46 and the lower flange 47 of the reinforcing body 10B. For the joining, spot welding at welding locations P5 and P6 is used.

  Similarly to the first embodiment, the three-point bending collision analysis of the second embodiment was performed using finite element method analysis software (trade name: PAM-CRASH 64-Bit Solvers 2012. 1). In the three-point bending collision analysis, a collision load was applied to the elongated front plate 3 at the longitudinal center A of the elongated box 2.

  According to the analysis result, in the cross section cut at the longitudinal center A of the long box 2, when the amount of deformation becomes maximum, as shown in FIG. 10, the upper surface 5 of the long box 2. Among them, a portion 48 facing the upper surface 44 of the reinforcing body 10B is deformed inside the elongated box 2 and is in contact with the upper surface 44 of the reinforcing body 10B. A portion 49 of the lower surface 6 of the long box 2 facing the lower surface 45 of the reinforcing body 10B is deformed inside the long box 2 and is in contact with the lower surface 45 of the reinforcing body 10B. On the other hand, the upper surface 44 and the lower surface 45 of the reinforcing body 10B are less deformed in the vertical direction.

  As shown in FIG. 11, in the second embodiment, the load [kN] increases in proportion up to the second predetermined deformation amount [mm], and when the second predetermined deformation amount [mm] is exceeded, The load [kN] decreases while fluctuating up and down. Therefore, the energy absorption amount [kJ] increases so as to gradually approach the predetermined amount as the deformation amount [mm] increases.

[4. Comparative example]
Next, a comparative example will be described. In the bumper reinforcement 1 of the comparative example, similarly to the first embodiment and the second embodiment, it has a curved shape in which both ends in the longitudinal direction are retreated, and the long box body 2 and the long front plate 3 are Provided (see FIGS. 1 to 3). The long box 2 and the long front plate 3 are made of steel. However, unlike the first and second embodiments, the reinforcing bodies (12A and 12B) are not installed in the long box 2.

  In the comparative example, as shown in FIG. 12, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box body 2. For the joining, spot welding at welding points P7 and P8 is used.

  Similar to the first embodiment and the second embodiment, the three-point bending collision analysis of the comparative example was performed using finite element method analysis software (trade name: PAM-CRASH 64-Bit Solvers 2012. 1). In the three-point bending collision analysis, a collision load was applied to the elongated front plate 3 at the longitudinal center A of the elongated box 2.

  According to the analysis result, in the cross section cut at the longitudinal center A of the long box 2, when the deformation amount becomes maximum, as shown in FIG. 13, the front surface of the long box 2 is opened. In the vicinity of 9, the upper surface 5 and the lower surface 6 of the long box 2 are greatly deformed inside the long box 2. Between the upper surface 5 and the lower surface of the long box 2 narrowed by the deformation, the long front plate 3 bites into the long box 2 and is greatly deformed.

[5. Comparison of analysis results]
The analysis result of 1st Embodiment or 2nd Embodiment is compared with the analysis result of a comparative example. As shown in FIG. 14, the peak load per mass is much larger in the first embodiment and the second embodiment than in the comparative example. As shown in FIG. 15, the amount of energy absorption per mass is much larger in the first embodiment and the second embodiment than in the comparative example.

  Thus, the peak load per mass and the amount of energy absorbed per mass are improved in the first embodiment and the second embodiment compared to the comparative example. The reason is that in the comparative example, stress concentrates in the vicinity of the center A in the longitudinal direction of the long box 2, while in the first and second embodiments, the longitudinal direction of the long box 2 The stress is dispersed throughout the three-point bending region including the center A.

[6. Summary]
As described above in detail, in the bumper reinforcement 1 according to the first embodiment or the second embodiment, the opening front surface 9 of the elongated box 2 is opened, while the upper flange of the elongated box 2 is opened. The long front plate 3 is joined to the lower flange 8 and the lower flange 8 by spot welding. Accordingly, the bumper reinforcement 1 according to the first embodiment or the second embodiment has a so-called reverse hat type closed cross-sectional shape.

  Furthermore, the bumper reinforcement 1 according to the first embodiment or the second embodiment includes reinforcing bodies 10A and 10B installed in the long box 2 at the center A in the long direction of the long box 2. ing. The rear surfaces 21 and 41 of the reinforcing bodies 10A and 10B are opposed to the rear surface 4 of the long box body 2, and are fixed to the rear surface 4 of the long box body 2 by spot welding at the welding locations P1 and P4. The upper sides of the upper inclined surfaces 22 and 42 of the reinforcing bodies 10A and 10B are located in the vicinity of the upper surface 5 of the elongated box 2. The lower sides of the lower inclined surfaces 23 and 43 of the reinforcing bodies 10A and 10B are located in the vicinity of the lower surface 6 of the long box 2. The upper surfaces 24 and 44 of the reinforcing bodies 10 </ b> A and 10 </ b> B are opposed to the upper surface 5 of the long box 2 in the vicinity of the upper surface 5 of the long box 2. The lower surfaces 25 and 45 of the reinforcing bodies 10 </ b> A and 10 </ b> B are opposed to the lower surface 6 of the long box body 2 in the vicinity of the lower surface 6 of the long box body 2.

  With such a configuration, when a collision occurs in the long front plate 3 at the center A in the long direction of the long box body 2 (three-point bending collision analysis result), the upper surface 5 of the long box body 2. Of the upper and lower surfaces 6, the portions 27, 28, 48, and 49 located in the vicinity of the upper surfaces 24 and 44 and the lower surfaces 25 and 45 of the reinforcing bodies 10 </ b> A and 10 </ b> B are deformed inside the elongated box 2 and are reinforced. It contacts the upper surfaces 24, 44 and the lower surfaces 25, 45 of the bodies 10A, 10B. In other words, at the center A in the longitudinal direction of the long box 2, the upper surface 5 and the lower surface 6 of the long box 2 are deformed inside the long box 2, but the deformation is the reinforcements 10 </ b> A and 10 </ b> B. Are obstructed by the upper surfaces 24, 44 and the lower surfaces 25, 45, so that the collapse of the cross section is suppressed. Therefore, the bumper reinforcement 1 according to the first embodiment or the second embodiment improves the peak load and the energy absorption amount per unit mass by suppressing the collapse of the cross section of the so-called reverse hat type closed cross section. Is possible.

  In the bumper reinforcement 1 according to the first embodiment, the reinforcing body 10 </ b> A includes a front surface 26 that extends from the upper surface 24 and the lower surface 25. The front surface 26 of the reinforcing body 10 </ b> A faces the opening front surface 9 of the long box 2. With such a configuration, the upper surface 24 and the lower surface 25 of the reinforcing body 10A are not easily deformed. Therefore, the bumper reinforcement 1 according to the first embodiment has a high effect of inhibiting the inner deformation of the long box 2.

  In the bumper reinforcement 1 according to the second embodiment, the reinforcing body 10 </ b> B includes an upper flange 46 that extends upward from the upper surface 44 and a lower flange 47 that extends downward from the lower surface 45. . The upper flange 46 of the reinforcing body 10 </ b> B is sandwiched between the upper flange 7 of the long box 2 and the long front plate 3. The lower flange 47 of the reinforcing body 10 </ b> B is sandwiched between the lower flange 8 of the long box 2 and the long front plate 3. With such a configuration, the upper surface 44 and the lower surface 45 of the reinforcing body 10B are hardly deformed. Therefore, the bumper reinforcement 1 according to the second embodiment has a high effect of inhibiting the inner deformation of the long box 2.

[7. Others]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, there is an example in which the bumper reinforcement 1 according to the first embodiment is changed (hereinafter, referred to as “bumper reinforcement 1 in a modified example”). Hereinafter, this modified example will be described. In the description of this modified example, the same reference numerals are given to the parts common to the bumper reinforcement 1 according to the first embodiment, and detailed description thereof will be omitted.

  As shown in FIG. 16, in the bumper reinforcement 1 of the modified example, the front surface 26 of the reinforcing body 10A is fixed to the long front plate 3 by spot welding at the welding point P9. Accordingly, the front surface 26 of the reinforcing body 10A is fixed to the long front plate 3 at the welding point P9, and the rear surface 21 of the reinforcing body 10A is fixed to the rear surface 4 of the long box body 2 at the welding point P1.

With such a configuration, the bumper reinforcement 1 according to the modified example is configured so that when a collision occurs in the long front plate 3 at the center A in the long direction of the long box body 2, Since the face plate 3 and the rear surface 4 of the elongated box 2 are transmitted to the reinforcing body 10A, the peak load per unit mass and the amount of energy absorption can be improved.

  In the bumper reinforcement 1 of the modified example, as shown in FIG. 16, the cross-sectional length L1 of the upper surface 24 and the lower surface 25 of the reinforcing body 10A is the cross-sectional length LA of the upper surface 5 and the lower surface 6 of the long box 2. Of 1/3 or less. With such a configuration, the modified bumper reinforcement 1 can ensure strength with high mass efficiency.

  In the bumper reinforcement 1 of the modified example, as shown in FIG. 16, the cross-sectional length L2 of the rear surface 21 of the reinforcing body 10A is less than or equal to half the cross-sectional length LB of the rear surface 4 of the long box 2. It is said. With such a configuration, the modified bumper reinforcement 1 can ensure strength with high mass efficiency.

  In the bumper reinforcement 1 of the modified example, the material strength of the long box 2 and the material strength of the reinforcing body 10A are equal, and the material strength of the long box 2 and the reinforcing body 10A is the same as that of the long front plate 3. Greater than material strength. Due to the magnitude relation of the material strength, the bumper reinforcement 1 of the modified example has a long front shape when a collision occurs in the long front plate 3 at the center A in the long direction of the long box 2. Since the stress generated in the face plate 3 is reduced, it is possible to prevent the long box 2 from being broken at the longitudinal center A.

  In the bumper reinforcement 1 according to the first embodiment, the bumper reinforcement 1 according to the second embodiment, and the bumper reinforcement 1 of the modified example, a long box 2, a long front plate 3, and a reinforcing body 10A, The material of 10B is not limited to the use of steel, and a material applicable to the bumper reinforcement 1 (for example, aluminum or CFRP (carbon fiber reinforced plastic)) is used.

  The joint (welding) locations including the symbols P1 and P2 include laser welding, arc welding, caulking, rivets and the like in addition to spot welding.

DESCRIPTION OF SYMBOLS 1 Bumper reinforcement 2 Elongate box 3 Elongate front board 4 Rear surface of elongate box 5 Upper surface of elongate box 6 Lower surface of elongate box 7 Upper flange of elongate box 8 Lower flange of long box body 9 Open front surface 10, 10A, 10B of long box body Reinforcing body 21, 41 Rear surface 22, 42 of reinforcing body Upper inclined surface 23, 43 of reinforcing body Lower inclination of reinforcing body Surfaces 24 and 44 Upper surface 25 and 45 of the reinforcing body Lower surface 26 of the reinforcing body Front surface 46 of the reinforcing body Upper flange 47 of the reinforcing body Lower flange of the reinforcing body A Center in the longitudinal direction of the elongated box

Claims (4)

A reinforcing body is provided inside the closed cross section formed from the long box and the long front plate,
A bumper reinforcement installed in a direction in which the long front plate side is a load input side,
The reinforcing body is provided so as to face the first upper surface, the first lower surface and the first rear surface of the elongated box so as to face each other.
Fixed to at least the first rear surface of the elongated box ,
The elongated box is
A first rear surface that is opened to face the first front surface; a first upper surface that extends from an upper side of the first rear surface toward the first front surface; A first lower surface extending from a lower side of the rear surface toward the first front surface and facing the first upper surface; and upward from the first front surface side of the first upper surface. A first upper flange that extends, and a first lower flange that extends downward from the first front surface side of the first lower surface,
The long front plate is
Fixing the first upper flange and the first lower flange of the elongated box,
The reinforcing body is
A second rear surface, an upper inclined surface extending obliquely upward from the upper side of the second rear surface, a lower inclined surface extending obliquely downward from the lower side of the second rear surface, A second upper surface extending from the upper side of the upper inclined surface; a second lower surface extending from the lower side of the lower inclined surface and provided opposite to the second upper surface; In the box,
The second rear surface of the reinforcing body faces the first rear surface of the elongated box and is fixed to the first rear surface of the elongated box,
The second upper surface of the reinforcing body is opposed to the first upper surface of the elongated box in the vicinity of the first upper surface of the elongated box,
It said second lower surface of the reinforcing member is a bumper reinforcement, wherein opposite to Rukoto the first lower surface of the elongated box body in a first vicinity of the bottom face of said elongated main body. The bumper reinforcement according to claim 1,
Before SL reinforcement, the bumper reinforcement, characterized in that it is provided inside the elongate box member in the longitudinal direction center of the front Symbol elongate box member. The bumper reinforcement according to claim 2,
The reinforcing body is
A second front surface extending from the second upper surface and the second lower surface;
The bumper reinforcement, wherein the second front surface of the reinforcing body faces the first front surface of the elongated box. The bumper reinforcement according to claim 2,
The reinforcing body is
A second upper flange extending upward from the second upper surface;
A second lower flange extending downward from the second lower surface;
The second upper flange of the reinforcing body is attached in a state sandwiched between the first upper flange of the elongated box and the elongated front plate,
The bumper reinforcement, wherein the second lower flange of the reinforcing body is attached in a state of being sandwiched between the first lower flange of the elongated box and the elongated front plate.

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