JP5056545B2 - Bumper mounting structure for vehicles - Google Patents

Description

  The present invention relates to an attachment structure for a vehicle bumper attached to the tip of a side member via a bumper stay.

  A bumper for a vehicle has a bumper reinforcement, and the bumper reinforcement is generally mounted across the ends of left and right side members via a bumper stay.

As a conventional bumper reinforcement, aluminum is extruded into a cross-sectional shape, and three hollow portions are continuously formed in the longitudinal direction, and a foam resin is made in the middle hollow portion of the three hollow portions. Some are filled with a filler made of foam material or synthetic rubber (see, for example, Patent Document 1).
JP 2000-301993 (page 3, FIG. 1)

  However, in such a conventional vehicle bumper mounting structure, the bumper reinforcement has a cross-sectional shape, and two ribs are formed in the closed cross section with respect to the input direction of the collision load. Bending strength is increased. For this reason, when a columnar object collides with the center part of the longitudinal direction of a bumper, the absorption efficiency of the collision energy at that time becomes high.

  Further, when a columnar object collides with the end portion in the longitudinal direction of the bumper, the bumper reinforcement is not easily crushed because the bumper reinforcement is filled with a filler in the middle of the three hollow portions. For this reason, the bumper stay and the side member joined to both ends of the bumper reinforcement are largely crushed.

  In this way, when the amount of deformation of the side members constituting the vehicle body skeleton is large, subsequent repair costs increase. Further, if the strength of the side member is increased in order to suppress the deformation amount of the side member, it is necessary to increase the thickness of the side member or to attach a reinforcing member, thereby increasing the weight of the vehicle body.

  Therefore, the present invention provides a mounting structure for a vehicle bumper that can suppress deformation of a side member when a collision load is input to both ends of the bumper without increasing the weight of the vehicle body.

  The present invention is provided on either one of the upper protrusion and the lower protrusion of the bumper stay coupled to the tip of the side member, the internal protrusion protruding in the input direction of the collision load from the substantially vertical center of the rear wall of the bumper reinforcement, A buckling reduction part with lower buckling strength than the other, and a bumper reinforcement at the longitudinal end of the bumper reinforcement, on the side corresponding to the buckling reduction part of the upper and lower parts of the bumper stay, the collision load than the other side The main feature is that it includes a load input adjustment unit that inputs a large amount of.

  According to the present invention, the bumper reinforcement can increase the section modulus by the internal protrusion, and therefore, when an object having a small collision area such as a columnar object collides with the central portion in the longitudinal direction of the bumper, Force bending load can be increased. Further, the reaction force of the bumper reinforcement is increased by the internal protrusion, and a large impact energy when the object collides can be efficiently absorbed.

  In addition, when an object collides with the bumper longitudinal end, when a collision load is input from the bumper reinforcement to the bumper stay, a large load is input to the side corresponding to the buckling reduction part of the bumper stay by the load input adjustment unit. In the bumper stay, the upper or lower portion provided with the buckling reduction portion buckles and retreats. As a result, the bumper reinforcement rotates around the longitudinal axis, and the internal protrusion also inclines with respect to the input direction of the collision load, and the root of the internal protrusion, that is, the internal protrusion and the rear A moment around the longitudinal axis is generated at the boundary with the wall.

  Therefore, after the bumper stay is crushed and deformed, the amount of collapsing energy in the bumper reinforcement can be increased because the amount of collapse of the bumper reinforcement is increased while bending deformation of the internal protrusion is promoted by the moment. . For this reason, since collision energy can be efficiently absorbed by the bumper stay and the bumper reinforcement before the collision load is input to the side member, the deformation of the side member can be effectively suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1 to 11 show a first embodiment of a mounting structure for a vehicle bumper according to the present invention, FIG. 1 is a perspective view showing a cross-section of a main portion of a mounting portion of a bumper reinforcement, and FIG. 2 is a bumper reinforcement. 3 is an enlarged cross-sectional view taken along line III-III in FIG. 2, FIG. 4 is an enlarged cross-sectional view taken along line IV-IV in FIG. 2, and FIG. It is an expanded sectional view along the VV line.

  6 is a plan view showing a state in which a columnar object collides with a substantially central portion in the longitudinal direction of the bumper reinforcement. FIG. 7 is an enlarged sectional view taken along line VII-VII in FIG. 6, and FIG. It is explanatory drawing which shows the FS characteristic line when a columnar object collides with the approximate center part of the longitudinal direction of a reinforcement compared with the past.

  Further, FIG. 9 is a plan view showing a state in which an object collides with the longitudinal end portion of the bumper reinforcement, and FIG. 10 shows a process of deforming the mounting portion of the bumper reinforcement by the collision (a) to (c). FIG. 11 is an enlarged cross-sectional view taken along line XX in FIG. 9, and FIG. 11 is an explanatory view showing an FS characteristic line when an object collides with the end of the bumper reinforcement in the longitudinal direction in comparison with the conventional case. It is.

  As shown in FIG. 2, the vehicle bumper mounting structure of the present embodiment is applied to a front bumper 1. The front bumper 1 includes a bumper reinforcement 2 that forms a skeleton, and is generally configured by covering the outside of the bumper reinforcement 2 with a bumper facer (not shown).

  The bumper reinforcement 2 extends in the vehicle width direction, and straddles the left and right side members 4 extending in the vehicle front-rear direction on both sides of the front compartment 3 at the front of the vehicle body. Are attached via bumper stays 5 respectively. The bumper reinforcement 2 is formed as a closed cross-sectional structure by a front wall 2a, a rear wall 2b, and upper and lower walls 2c, 2d.

  Here, as shown in FIGS. 3 and 4, in the present invention, the collision load input direction, that is, the front side of the vehicle, extends substantially from the center in the vertical direction over the entire length of the rear wall 2 b of the bumper reinforcement 2. An internal projecting portion 10 is formed to project.

  The internal protruding portion 10 protrudes from the front center of the rear wall 2b in the vertical direction over a predetermined width W (see FIG. 1), and the protruding tip 10a approaches (contacts) the vicinity of the inner surface of the front wall 2a. You may).

  The side member 4 is formed as a closed cross-sectional structure having a rectangular cross section by the upper and lower walls 4a and 4b and the left and right walls 4c and 4d, and serves as a skeleton member in the longitudinal direction of the vehicle body.

  The bumpy stay 5 is generally formed as a closed cross-sectional structure having a rectangular cross section by the upper and lower walls 5a and 5b and the left and right walls 5c and 5d in the same manner as the side member 4. In the present embodiment, the bumpy stay 5 and the side member 4 are formed. The closed cross-sectional dimensions are substantially equal.

  Here, a buckling reduction part 11 having a buckling strength lower than that of the other (lower part) is provided at either the upper part or the lower part of the bumper stay 5, that is, in the upper part in this embodiment.

  That is, the bumper stay 5 of the present embodiment is configured by combining first to third stay parts 5P, 5Q, and 5R that are divided into an upper part and a lower part, and the upper part is further divided forward and backward.

  The first stay part 5P and the second stay part 5Q are formed in a substantially inverted U-shaped cross section that opens downward, and the third stay part 5R is formed in a substantially U-shaped cross section that opens upward. Then, the rear end of the first stay part 5P is overlapped and joined to the inside of the front end of the second stay part 5Q, and the lower ends of the joined first and second stay parts 5P and 5Q are shown in FIG. As described above, the third stay part 5R is overlapped and joined to the inside of the upper end portion.

  At this time, the upper part of the bumper stay 5 is composed of two members of the first and second stay parts 5P and 5Q, and these members are assembled to each other, so that the third stay composed of one member at the lower part is formed. With respect to the part 5 </ b> R, the buckling strength is reduced to be the above-described buckling reduction portion 11. Alternatively, among the first and second stay parts 5P and 5Q, the thickness of at least the first stay part 5P is made thinner than that of the third stay part 5R to reduce the buckling strength. 11 can also be used.

  Further, when the first to third stay parts 5P, 5Q, and 5R are joined and configured, as shown in FIG. 5, the longitudinal direction of the bumper reinforcement 2 is substantially the same among the stay inner surface 5in and the stay outer surface 5out of the bumper stay 5. The buckling strength of the stay inner surface “in” that is easily buckled when a collision load is input to the central portion is a strength balance that precedes the deformation of the bumper reinforcement 2.

  And the bumper stay 5 connects the rear end of the bumper stay 5 to the front end of the side member 4, and as shown in FIG. 1, the attachment plate 42 is joined to the flange portion 41 provided around the front end of the side member 4, A similar mounting plate 52 is joined to a flange portion 51 provided around the rear end of the bumper stay 5, and both the mounting plates 42 and 52 are coupled to each other. The mounting plates 42 and 52 may be provided with at least one of them.

  The front end of the bumper stay 5 is connected to the rear wall 2b of the bumper reinforcement 2, and a mounting plate 54 is joined to a flange portion 53 provided around the front end of the bumper stay 5, and the mounting plate 54 is connected to the rear wall described above. Join to 2b. That is, the bumper reinforcement 2 and the bumper stay 5 are coupled with the attachment plate 54 interposed therebetween.

  And in the longitudinal direction both ends of the bumper reinforcement 2, as shown in FIG. 1, the side corresponding to the buckling reduction part 11 mentioned above among the upper part and the lower part of the bumper stay 5, that is, the upper part in this embodiment, A load input adjustment unit 12 for inputting a collision load larger than the other side (lower part) is provided.

  That is, in the present embodiment, the energy absorbing member 13 formed of a foamed resin material or the like is provided on the front surface of the bumper reinforcement 2, that is, on the front wall 2a. And the above-mentioned load input adjustment part 12 is a front corresponding to the buckling reduction part 11 among the upper part and the lower part of the energy absorption member 13, ie, an upper part in this embodiment, and is ahead of the other side (lower part). It is comprised by the thickness change part 13T which enlarged the protrusion amount (thickness).

  That is, as shown in FIG. 3, the energy absorbing member 13 is formed with a substantially equal projecting amount (thickness) P from the upper part to the lower part in the central portion in the longitudinal direction of the bumper reinforcement 2 and has a substantially rectangular cross section. However, at both ends in the longitudinal direction of the bumper reinforcement 2, as shown in FIG. 4, the protruding amount (thickness) P decreases from the top to the bottom, and the cross section is almost inverted triangle or trapezoidal shape. It has become. Accordingly, at both ends of the bumper reinforcement 2, the colliding object first interferes with the upper portion of the energy absorbing member 13, and then gradually crushes to the lower portion of the energy absorbing member 13.

  The mounting plate 54 interposed between the bumper reinforcement 2 and the bumper stay 5 is divided at boundaries corresponding to the upper and lower portions of the bumper stay 5, respectively, and is divided into an upper mounting plate 54A and a lower mounting plate 54B. It is configured.

  Therefore, by dividing the mounting plate 54 into the upper mounting plate 54A and the lower mounting plate 54B, the load input to the upper part of the bumper reinforcement 2 is transmitted to the upper part of the bumper stay 5 and input to the lower part of the bumper reinforcement 2. The load can be transmitted to the lower part of the bumper stay 5.

  In the mounting structure of the front bumper 1 thus configured, the overall strength balance from the bumper reinforcement 2 to the side member 4 via the bumper stay 5 is {the strength of the side member 4> the strength of the bumper reinforcement 2 > Intensity of bumper stay 5}.

  Further, as shown in FIG. 1, buckling of the bumper stay 5 is reduced on the side where the impact load of the internal protrusion 10 described above is input, that is, in the present embodiment, in the vicinity of the root portion 10 </ b> R of the upper portion of the internal protrusion 10. It is arranged corresponding to the part 11.

  According to the mounting structure of the front bumper 1 of the present embodiment having the above configuration, the bumper reinforcement 2 can increase the section modulus by the internal protrusion 10, and therefore, as shown in FIGS. The bending load of the bumper reinforcement 2 can be increased when an object T having a small collision area, such as a columnar body, collides with the central portion in the longitudinal direction of 1. Further, the reaction force of the bumper reinforcement 2 is increased by the internal protruding portion 10, and a large impact energy when the object T collides can be efficiently absorbed.

  That is, when the object T collides with the central portion of the bumper reinforcement 2 in the longitudinal direction, the deformation amount on the vehicle body side is determined mainly by the bending strength of the bumper reinforcement 2 and the support strength of the bumper stay 5 that supports the bumper reinforcement 2. Is done. At this time, the internal protrusion 10 is disposed inside the bumper reinforcement 2, whereby the section modulus of the bumper reinforcement 2 can be increased and the bending strength of the bumper reinforcement 2 can be increased.

  Further, as the buckling strength of the stay inner surface 5 in of the bumper stay 5, the bumper reinforcement 2 has a strength that is difficult to buckle even if a bending load is applied by the object T colliding with the center of the bumper reinforcement 2. Even if this is done, the bumpy stay 5 is unlikely to be greatly deformed, and the repair cost can be reduced.

  Thus, when a collision load is input to the central portion in the longitudinal direction of the bumper reinforcement 2, as shown in FIG. 8, the FS characteristic A1 of the mounting structure of the front bumper 1 of the present embodiment (solid line in the figure). And the FS characteristic B1 (broken line in the figure) of the conventional mounting structure can be set almost equally high.

  Next, when an object T collides with the longitudinal end of the front bumper 1 as shown in FIG. 9, when a collision load is input from the bumper reinforcement 2 to the bumper stay 5 as shown in FIG. The load input adjustment unit 12 inputs a large load to the upper side corresponding to the buckling reduction unit 11 of the bumper stay 5. For this reason, as shown in FIG.10 (b), as for the bumper stay 5, the upper part in which the buckling reduction part 11 was provided buckles and reverse | retreats.

  As a result, the bumper reinforcement 2 rotates around the longitudinal axis, and accordingly, the internal protrusion 10 is also inclined with respect to the input direction of the collision load, and the root portion 10R of the internal protrusion 10, that is, the internal A moment M in the direction around the longitudinal axis is generated at the boundary between the protrusion 10 and the rear wall 2b of the bumper reinforcement 2.

  Accordingly, as shown in FIG. 10 (c), after the bumper stay 5 is crushed and deformed, the bending deformation of the bumper reinforcement 2 is increased while the internal projecting portion 10 is promoted to bend and deformed by the moment described above. The amount of collision energy absorbed by the reinforcement 2 can be increased. For this reason, since collision energy can be efficiently absorbed by the bumper stay 5 and the bumper reinforcement 2 before the collision load is input to the side member 4, deformation of the side member 4 can be effectively suppressed.

  That is, when the object T collides with the longitudinal end portion of the bumper reinforcement 2, first, the upper portion of the energy absorbing member 13 is long in the vehicle front-rear direction as viewed from the side of the vehicle. Will be pushed into. At that time, since the strength of the upper portion of the bumper stay 5 is low, the upper portion of the bumper reinforcement 2 is pushed into the upper portion of the bumper stay 5.

  In addition, since the mounting plate 54 is divided into upper and lower parts, the upper part of the bumper reinforcement 2 is efficiently pushed into the upper part of the bumper stay 5, so that the bumper reinforcement 2 substantially rotates around the axis in the vehicle width direction. As a result of this rotational movement, the internal protrusion 10 of the bumper reinforcement 2 simultaneously rotates around the axis in the vehicle width direction, and as shown in FIG. An angle α is generated between the protrusion direction. The above-described moment M is generated at the root portion 10R of the internal protrusion 10 by this angle α.

  The bumper stay 5 is crushed and crushed in the axial direction by the progress of the collision phenomenon, and the bumper reinforcement 2 is also crushed and deformed. However, a bending moment M is generated at the base portion 10 </ b> R of the internal protrusion 10. Therefore, as shown in FIG. 10C, the internal protrusion 10 falls down and deforms, and the amount of collapse of the entire end of the bumper reinforcement 2 increases. Thereby, the amount of collision energy absorbed by the bumper reinforcement 2 can be promoted.

  Therefore, as shown in FIG. 11, when the mounting structure of the front bumper 1 of the present embodiment takes a collision form similar to that of the conventional structure, the bumper reinforcement has a high bending strength in the conventional structure, Collision energy is absorbed by the side member being crushed. On the other hand, in the mounting structure of the present embodiment, collision energy can be absorbed by crushing the bumper reinforcement 2, so that deformation of the side member 4 can be suppressed. In the figure, the solid line indicates the characteristic A2 of this embodiment, and the broken line indicates the conventional characteristic B2.

  As a result, the mounting structure of the present embodiment can suppress the deformation of the side member 4 as compared with the conventional one, so that the repair cost after the collision can be suppressed. Moreover, in this embodiment, since it is not necessary to raise the intensity | strength of the side member 4, it can suppress efficiently that the increase in a vehicle body weight and cost increase.

  In the present embodiment, the mounting plate 54 interposed between the bumper reinforcement 2 and the bumper stay 5 is divided at the boundary portions corresponding to the upper and lower portions of the bumper stay 5, respectively. The collision load that is largely input to the upper portion of the longitudinal end portion of the force 2 can be concentrated and transmitted to the upper portion of the bumper stay 5. Thereby, the buckling reduction part 11 provided in the upper part of the bumper stay 5 can be efficiently buckled, and as a result, the bumper reinforcement 2 can be reliably rotated around the longitudinal axis.

  Further, among the upper and lower parts of the energy absorbing member 13 provided on the front surface of the bumper reinforcement 2, the load input adjusting unit 12 is arranged such that the upper part corresponding to the buckling reducing part 11 is forward of the other side (lower part). It is comprised by the thickness change part 13T which enlarged the protrusion amount (wall thickness). Thereby, the colliding object T first interferes with the upper portion where the thickness of the energy absorbing member 13 is large, and then the energy absorbing member 13 is compressed and deformed toward the lower portion where the thickness is small as the collision phenomenon proceeds. Therefore, the collision load of the object T can be largely input to the upper part of the bumper reinforcement 2 with a simple configuration in which the thickness of the energy absorbing member 13 is simply changed.

  Furthermore, since the vicinity of the side where the collision load of the internal protrusion 10 is input greatly (the base portion 10R of the upper portion) is arranged corresponding to the buckling reduction portion 11 of the bumper stay 5, the base portion of the internal protrusion 10 is provided. Since 10R can easily enter the buckling reduction portion 11 of the bumper stay 5, the bumper reinforcement 2 can be more reliably caused to rotate around the longitudinal axis.

(Second Embodiment)
12 and 13 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted as much as possible. FIG. FIG. 13 is an enlarged cross-sectional view corresponding to line IV-IV in FIG. 2, and FIG. 13 is an enlarged cross-sectional view corresponding to line III-III.

  The vehicle bumper mounting structure of this embodiment is basically the same as that of the first embodiment, and both end portions in the longitudinal direction of the bumper reinforcement 2 are coupled to the side member 4 via the bumper stay 5. (See FIG. 2). As shown in FIGS. 12 and 13, an internal protrusion 10 is formed over the entire length of the rear wall 2 b of the bumper reinforcement 2, and the bumper stay 5 sits on the upper part of the upper part and the lower part. The bending reduction part 11 is provided. Furthermore, the load input adjustment part 12 is provided in the upper part corresponding to the buckling reduction part 11 among the upper part and the lower part of the bumper stay 5 in the longitudinal direction both ends of the bumper reinforcement 2.

  Here, this embodiment is mainly different from the first embodiment in that the load input adjustment unit 12 corresponds to the buckling reduction unit 11 among the upper and lower parts of the bumper reinforcement 2 as shown in FIG. The external protrusion 14 is provided on the side (upper part).

  The external projecting portion 14 is formed in a reverse U-shaped cross section that projects forward and covers substantially the upper half of the front wall 2a of the bumper reinforcement 2, and a flange portion 14f1 extending from the upper surface thereof is formed on the bumper reinforcement 2 While joining to the wall 2c, the flange part 14f2 which bent the edge part of the lower surface is joined to the front wall 2a.

  In the present embodiment, the energy absorbing member 13 provided on the front surface of the bumper reinforcement 2 has a substantially equal protrusion amount (thickness) P from the upper part to the lower part of the bumper reinforcement 2 and the longitudinal direction of the bumper reinforcement 2. It is provided over the entire length. The energy absorbing member 13 corresponding to both ends in the longitudinal direction of the bumper reinforcement 2 is formed with a notch 13C substantially along the outer shape of the external protrusion 14.

  Therefore, according to the mounting structure of the front bumper 1 of the present embodiment, the bumper reinforcement 2 is provided with the internal protrusion 10, the bumper stay 5 is provided with the buckling reduction portion 11, and both ends of the bumper reinforcement 2 in the longitudinal direction are provided. By providing the load input adjusting unit 12 in the part, the same operational effects as those of the first embodiment can be obtained.

  In particular, in the present embodiment, in addition to the operational effects of the first embodiment, the load input adjusting unit 12 is the external protrusion 14, so that the object T that collides with the end in the longitudinal direction of the bumper reinforcement 2 is It is possible to cause the bumper reinforcement 2 to rotate about the longitudinal axis by interfering with the external protrusion 14 and causing the collision load to be largely input to the upper part of the bumper reinforcement 2.

  Therefore, when the energy absorbing member 13 is not provided or when the shape of the energy absorbing member 13 is greatly deformed, the external protrusion 14 of the present embodiment is provided to generate the deformation mode targeted by the present invention. be able to.

(Third embodiment)
14 and 15 show a third embodiment of the present invention, in which the same components as in the first embodiment are denoted by the same reference numerals and redundant description is omitted as much as possible, and FIG. 14 is shown in FIG. FIG. 15 is an enlarged cross-sectional view corresponding to line IV-IV in FIG. 2.

  The vehicle bumper mounting structure of this embodiment is basically the same as that of the first embodiment, and both end portions in the longitudinal direction of the bumper reinforcement 2 are coupled to the side member 4 via the bumper stay 5. (See FIG. 2). Further, as shown in FIGS. 14 and 15, an internal protrusion 10 is formed over the entire length of the rear wall 2 b of the bumper reinforcement 2 in the longitudinal direction. Further, the bumper stay 5 is provided with a buckling reduction portion 11 and load input adjusting portions 12 at both ends in the longitudinal direction of the bumper reinforcement 2, and an energy absorbing member 13 is provided on the front surface of the bumper reinforcement 2. It is provided. In the present embodiment, the load input adjusting unit 12 is formed by the thickness changing unit 13T as in the first embodiment.

  Here, the present embodiment is mainly different from the above-described embodiments in that, as shown in FIG. 15, among the upper side 10 b and the lower side 10 c of the internal protrusion 10 located at both longitudinal ends of the bumper reinforcement 2. The bead 15 as the easily deformable portion is provided on the upper side 10 b corresponding to the buckling reduction portion 11 of the bumper stay 5. The bead 15 is formed as a ridge that protrudes upward at substantially the center in the protruding direction of the upper side 10b.

  Therefore, according to the mounting structure of the front bumper 1 of the present embodiment, the same effects as those of the first embodiment can be achieved by providing the internal protruding portion 10, the buckling reduction portion 11, and the load input adjusting portion 12.

  In particular, in the present embodiment, in addition to the effects of the first embodiment, the beads 15 are provided on the upper side 10b of the internal protrusion 10 located at both ends in the longitudinal direction of the bumper reinforcement 2, so that the bumper reinforcement 2 When the object T collides with the end portion in the longitudinal direction, when the internal protrusion 10 falls and deforms from the root portion 10R due to the bending moment M (see FIG. 10), the internal protrusion 10 is crushed from the bead 15 as a starting point. Thereby, the amount of collision energy absorbed by the bumper reinforcement 2 can be increased. At this time, the bead 15 is provided on the side (upper part) of the bumper stay 5 corresponding to the buckling reduction part 11, so that the internal protrusion 10 can be easily crushed.

  The bead 15 may be protruded downward, or may be formed thin as an easily deformable portion.

  In the present embodiment, the load input adjustment unit 12 is the thickness changing portion 13T of the energy absorbing member 13 as in the first embodiment, but is not limited to this, and the external protrusion 14 shown in the second embodiment. It may be.

(Fourth embodiment)
16 and 17 show a fourth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted as much as possible. FIG. FIG. 17 is an enlarged cross-sectional view corresponding to line IV-IV in FIG. 2.

  The vehicle bumper mounting structure of this embodiment is basically the same as that of the first embodiment, and both end portions in the longitudinal direction of the bumper reinforcement 2 are coupled to the side member 4 via the bumper stay 5. (See FIG. 2). As shown in FIGS. 16 and 17, an internal protrusion 10 is formed over the entire length of the rear wall 2 b of the bumper reinforcement 2 in the longitudinal direction. Further, the bumper stay 5 is provided with a buckling reduction portion 11 and load input adjusting portions 12 at both ends in the longitudinal direction of the bumper reinforcement 2, and an energy absorbing member 13 is provided on the front surface of the bumper reinforcement 2. It is provided. In the present embodiment, the load input adjusting unit 12 is formed by the thickness changing unit 13T as in the first embodiment.

  Here, the present embodiment is mainly different from the above-described embodiments in that, as shown in FIG. 17, the internal protrusions 10 positioned at both ends in the longitudinal direction of the bumper reinforcement 2 are arranged in the input direction of the collision load (this In the embodiment, it is inclined to the side (upward) corresponding to the buckling reduction portion 11 with respect to the vehicle longitudinal direction).

  Therefore, according to the mounting structure of the front bumper 1 of the present embodiment, the same effects as those of the first embodiment can be achieved by providing the internal protruding portion 10, the buckling reduction portion 11, and the load input adjusting portion 12.

  In particular, in this embodiment, in addition to the operational effects of the first embodiment, the internal protrusions 10 positioned at both ends in the longitudinal direction of the bumper reinforcement 2 are used as the buckling reduction portion 11 with respect to the input direction of the collision load. It is inclined correspondingly upward. As a result, the bending moment M can be reliably generated at the base portion 10R of the internal protrusion 10 from the beginning of the collision, and the internal deformation of the internal protrusion 10 due to the collision load is promoted to absorb the collision energy by the bumper reinforcement 2. The effect can be enhanced.

(Fifth embodiment)
FIG. 18 shows a fifth embodiment of the present invention, in which the same components as in the first embodiment are denoted by the same reference numerals and redundant description is omitted as much as possible. FIG. 18 is a perspective view of the bumper stay 5. is there.

  The mounting structure of the vehicle bumper according to this embodiment is basically the same as that of the first embodiment. As shown in FIG. 18, the bumper stay 5 includes upper and lower walls 5a and 5b and left and right walls 5c. 5d is generally formed as a closed cross-sectional structure having a rectangular cross section. Moreover, the buckling reduction part 11 is provided in the upper part of the bumper stay 5, and it comprises the 1st-3rd stay parts 5P, 5Q, and 5R in combination. Further, a mounting plate 52 coupled to a mounting plate 42 (see FIG. 1) of the side member 4 is joined to the rear end of the bumper stay 5, and a rear surface 2b of the bumper reinforcement 2 (see FIG. 1) is connected to the front end of the bumper stay 5. The attachment plate 54 to be joined is joined.

  Here, this embodiment is mainly different from the first embodiment in that the mounting plate 54 interposed between the bumper reinforcement 2 and the bumper stay 5 has a weak portion at the boundary corresponding to the upper and lower portions of the bumper stay 5, respectively. The bead 16 is provided.

  That is, in the first embodiment, the mounting plate 54 is divided at the boundary portions corresponding to the upper portion and the lower portion of the bumper stay 5, but in this embodiment, the boundary portion is divided by the bead 16 without dividing the boundary portion. It is connected.

  Therefore, according to the mounting structure of the front bumper 1 of the present embodiment, when the object T collides with the longitudinal end portion of the front bumper 1 and a collision load is input from the bumper reinforcement 2 to the bumper stay 5, the load input adjustment unit 12, a large load is input to the upper side corresponding to the buckling reduction portion 11 of the bumper stay 5. At this time, the mounting plate 54 is easily deformed from the bead 16 provided at the boundary corresponding to the upper and lower portions of the bumper stay 5, and the load is efficiently applied from the upper portion of the bumper reinforcement 2 to the buckling reduction portion 11 of the bumper stay 5. Can communicate well. Accordingly, the upper part of the bumper reinforcement 2 is pushed into the upper part of the bumper stay 5 so that the bumper reinforcement 2 can be substantially rotated around an axis in the vehicle width direction.

  Further, in the present embodiment, the state in which the upper part and the lower part are connected by the bead 16 can be maintained without dividing the mounting plate 54, so that the rigidity for supporting the bumper reinforcement 2 by the bumper stay 5 can be improved.

  FIG. 19 is a perspective view of a bumper stay showing a modified example of the fifth embodiment of the present invention, where the mounting plate 54 has a notch 17 as a weakened part provided at the boundary corresponding to the upper part and the lower part of the bumper stay 5, respectively. Show.

  Even in this case, when a large load is input to the bumper stay 5 from the upper part of the bumper reinforcement 2 as in the fifth embodiment, the mounting plate 54 is easily deformed from the notch portion 17 so that the bumper reinforcement 2 A load can be efficiently transmitted from the upper part to the buckling reduction part 11 of the bumper stay 5. Of course, since the state which connected the upper part and the lower part can be hold | maintained without dividing | segmenting the attachment board 54, the rigidity which supports the bumper reinforcement 2 can be improved.

(Sixth embodiment)
FIG. 20 shows a sixth embodiment of the present invention, in which the same components as those of the first embodiment are denoted by the same reference numerals and redundant description is omitted as much as possible. FIG. 20 is a perspective view of a bumper stay. .

  The vehicle bumper mounting structure of the present embodiment is basically the same as that of the first embodiment. As shown in FIG. 20, the bumper stay 5 includes upper and lower walls 5a and 5b and left and right side walls 5c. 5d is generally formed as a closed cross-sectional structure having a rectangular cross section.

  Further, a mounting plate 52 coupled to the mounting plate 42 of the side member 4 is joined to the rear end of the bumper stay 5, and joined to the rear surface 2 b (see FIG. 1) of the bumper reinforcement 2 at the front end of the bumper stay 5. A mounting plate 54 is joined.

  Here, this embodiment is mainly different from the first embodiment in that the bumper stay 5 has a substantially inverted U-shaped fourth stay part 5S that opens downward and a substantially U-shaped cross-section that opens upward. 5th stay parts 5T, and the lower end part of the 4th stay parts 5S is overlapped and joined inside the upper end part of the 5th stay parts 5T. And the buckling reduction part 11 consists in the bead 18 formed in the vehicle width direction of the upper wall 5a of the 4th stay parts 5S.

  Therefore, according to the mounting structure of the front bumper 1 of the present embodiment, when a longitudinal end portion of the bumper reinforcement 2 collides, a large load is applied from the upper portion of the bumper reinforcement 2 via the load input adjustment unit 12. When input to the upper part of the bumper stay 5, the bumper stay 5 can be easily bent starting from the bead 18 formed on the upper wall 5 a, and the bumper reinforcement 2 can be rotated around the longitudinal axis.

  Thereby, in this embodiment, the effect similar to 1st Embodiment can be show | played, reducing the number of the structural members, ie, the stay parts 5S and 5T, of the bumper stay 5.

(Seventh embodiment)
FIGS. 21 and 22 show a seventh embodiment of the present invention, in which the same components as in the first embodiment are denoted by the same reference numerals and redundant description is omitted as much as possible. FIG. 21 is a bumper reinforcement. FIG. 22 is a side view of the main part of the mounting part of the bumper reinforcement.

  The mounting structure of the vehicle bumper of this embodiment is basically the same as that of the first embodiment. As shown in FIGS. 21 and 22, both longitudinal ends of the bumper reinforcement 2 are connected to the bumper stay 5. It is connected to the side member 4 via Further, the bumper reinforcement 2 is formed with an internal protrusion 10, and a buckling reduction portion 11 is provided at the upper part of the upper and lower parts of the bumper stay 5. Furthermore, the load input adjustment part 12 is provided in the upper part corresponding to the buckling reduction part 11 among the upper part and the lower part of the bumper stay 5 in the longitudinal direction both ends of the bumper reinforcement 2.

  Here, this embodiment is mainly different from the first embodiment in that the side member 4 has a reinforcing portion on the extension of the protruding direction of the internal protruding portion 10 (the front-rear direction in the present embodiment) extending rearward of the vehicle. The flange portion 19 is provided.

  The flange portion 19 is provided to extend in the front-rear direction at substantially the upper and lower central portions of the left and right walls 4c, 4d of the side member 4. That is, in this embodiment, the side member 4 is constituted by an upper member 4P having a substantially inverted U-shaped cross section that opens downward, and a lower member 4Q that has a generally U-shaped cross section that opens upward, and both end portions of the upper member 4P are formed. An upper flange 19a bent outward and a lower flange 19b bent at both ends of the lower member 4Q are overlapped and joined. The above-described flange portion 19 is formed by the upper flange 19a and the lower flange 19b that are overlapped with each other.

  In the present embodiment, the four outer peripheral surfaces (5a to 5d) of the bumper stay 5 having a closed cross-sectional structure each having a rectangular cross section are substantially aligned with the in-plane direction of the outer peripheral four surfaces (4a to 4d) of the side member 4. It is.

  Therefore, according to the mounting structure of the front bumper 1 of the present embodiment, the side member 4 is provided with the flange portion 19 on the extension obtained by extending the protruding direction of the internal protruding portion 10 toward the rear of the vehicle. The rigidity of the side member 4 can be increased at the portion where 19 is provided. For this reason, when a collision load is input to the end portion in the longitudinal direction of the bumper reinforcement 2, the internal projecting portion 10 falls and deforms and transmits the load to the vehicle rear side of the internal projecting portion 10. Since the flange portion 19 is provided in the load transmission path, the side member 4 can be prevented from being crushed.

  In addition, since the four outer peripheral surfaces (5a to 5d) of the bumper stay 5 are made to substantially coincide with the in-plane direction of the outer peripheral four surfaces (4a to 4d) of the side member 4, the load transmitted in the plane of the bumper stay 5 is reduced. It can be transmitted to the side member 4 efficiently, and local deformation of the side member 4 can also be suppressed from this point.

  Therefore, in this embodiment, the deformation of the side member 4 can be effectively suppressed, so that the repair cost after the collision can be kept low.

  In the present embodiment, the flange portion 19 is shown as the reinforcing portion. However, the present invention is not limited to this, and the reinforcing band plate may be welded to the both side walls 4c, 4d of the side member 4, and the both side walls 4c, 4d. The upper and lower central portions may be formed thick.

  Moreover, the structure which makes the outer periphery 4 surface (5a-5d) of the bumper stay 5 substantially correspond with the in-plane direction of the outer periphery 4 surface (4a-4d) of the side member 4 exists in the 1st-6th embodiment mentioned above. Is also applicable.

  By the way, although the mounting structure of the vehicle bumper of the present invention has been described with reference to the first to seventh embodiments, other embodiments are not limited to these embodiments and do not depart from the gist of the present invention. Various types can be adopted. For example, the rotational movement for generating the bumper reinforcement 2 around the longitudinal axis is provided with the buckling reduction portion 11 at the upper part of the bumper stay 5 because of the behavior that the front is rotated upward. Alternatively, the buckling reduction portion 11 may be provided below the bumper stay 5. In this case, the bumper reinforcement 2 behaves so that the front rotates downward, and accordingly, the direction in which the internal protrusion 10 falls and the side where the load input adjustment unit 12 inputs a large load is turned upside down.

  Further, although the present embodiment has been described by taking the front bumper 1 as an example, the present embodiment can also be applied to a rear bumper mounting structure.

The perspective view which cuts and shows the principal part of the attachment part of the bumper reinforcement concerning 1st Embodiment of this invention. The top view which shows the attachment state of the bumper reinforcement concerning 1st Embodiment of this invention. The expanded sectional view along the III-III line in FIG. The expanded sectional view along the IV-IV line in FIG. The expanded sectional view along the VV line in FIG. The top view which shows the state which the columnar object collided with the approximate center part of the longitudinal direction of the bumper reinforcement concerning 1st Embodiment of this invention. The expanded sectional view along the VII-VII line in FIG. Explanatory drawing which shows the FS characteristic line compared with the past when a columnar object collides with the substantially central part of the longitudinal direction of the bumper reinforcement concerning 1st Embodiment of this invention. The top view which shows the state which an object collides with the longitudinal direction edge part of the bumper reinforcement concerning 1st Embodiment of this invention. FIG. 10 is an enlarged cross-sectional view taken along line X-X in FIG. 9, illustrating the process in which the mounting portion of the bumper reinforcement is deformed by a collision according to the first embodiment of the present invention in order from (a) to (c). Explanatory drawing which shows the FS characteristic line compared with the former when an object collides with the longitudinal direction edge part of the bumper reinforcement concerning 1st Embodiment of this invention. The expanded sectional view corresponding to the III-III line in Drawing 2 concerning a 2nd embodiment of the present invention. The expanded sectional view corresponding to the IV-IV line in FIG. 2 concerning 2nd Embodiment of this invention. The expanded sectional view corresponding to the III-III line in Drawing 2 concerning a 3rd embodiment of the present invention. The expanded sectional view corresponding to the IV-IV line in FIG. 2 concerning 3rd Embodiment of this invention. The expanded sectional view corresponding to the III-III line in Drawing 2 concerning a 4th embodiment of the present invention. The expanded sectional view corresponding to the IV-IV line in FIG. 2 concerning 4th Embodiment of this invention. The perspective view of the bumper stay concerning 5th Embodiment of this invention. The perspective view of the bumper stay which shows the modification of 5th Embodiment of this invention. The perspective view of the bumper stay concerning a 6th embodiment of the present invention. The perspective view which cuts and shows the principal part of the attachment part of the bumper reinforcement concerning 7th Embodiment of this invention. The principal part side view of the attachment part of the bumper reinforcement concerning 7th Embodiment of this invention.

Explanation of symbols

1 Front bumper (vehicle bumper)
2 Bumper Reinforce 4 Side Member 5 Bumper Stay 54 Mounting Plate 54A Upper Mounting Plate 54B Lower Mounting Plate 10 Internal Protrusion 10R Root of Internal Protrusion 11 Bumpy Reducing Buckling 12 Bumper Reinforce Load Input Adjustment 13 Energy Absorbing member 13T Thickness changing part of energy absorbing member 14 External protruding part of bumper reinforcement 15 Bead of internal protruding part (easy deformation part)
16 Mounting plate bead (fragile part)
18 Bumpastay Bead (Buckling Reduction Section)
19 Side member flange (reinforcement)

Claims (11)

Left and right side members extending in the vehicle longitudinal direction on both sides in the vehicle width direction;
Bumper stays coupled to the ends of the left and right side members,
In the mounting structure of the bumper for a vehicle provided with a bumper reinforcement having a closed cross-sectional structure, which is mounted across the left and right side members via the bumper stay,
An internal projecting portion projecting from the substantially central portion of the rear wall of the bumper reinforcement in the input direction of the collision load;
A buckling reduction portion that is provided on either the upper part or the lower part of the bumper stay and has a buckling strength lower than the other;
Provided at the longitudinal end of the bumper reinforcement, and on the side corresponding to the buckling reduction portion of the upper and lower portions of the bumper stay, a load input adjusting portion for inputting a collision load larger than the other side. A vehicle bumper mounting structure characterized by the above.   2. The bumper reinforcement and the bumper stay are joined with an attachment plate interposed therebetween, and the attachment plate is divided at boundaries corresponding to the upper and lower portions of the bumper stay, respectively. Mounting structure for vehicle bumpers.   The bumper reinforcement and the bumper stay are joined with an attachment plate interposed therebetween, and weak portions are provided at boundaries corresponding to the upper and lower portions of the bumper stay of the attachment plate, respectively. Item 4. A bumper mounting structure according to Item 1.   The load input adjustment unit is a meat having an upper part and a lower part of an energy absorbing member provided on the front surface of the bumper reinforcement, wherein the side corresponding to the buckling reduction part has a larger forward protrusion than the other side. It is a thickness change part, The mounting structure of the bumper for vehicles as described in any one of Claims 1-3 characterized by the above-mentioned.   The load input adjusting portion is an external protrusion provided on a side corresponding to the buckling reduction portion of an upper portion and a lower portion of the bumper reinforcement. The mounting structure of the vehicle bumper described in 1.   The vehicle according to any one of claims 1 to 5, wherein a vicinity of a root portion on a side where a collision load of the internal projecting portion is largely input is arranged in correspondence with the buckling reduction portion of a bumper stay. Bumper mounting structure.   The easily deformable portion is provided on the side corresponding to the buckling reduction portion among the upper side and the lower side of the internal projecting portion located at both longitudinal ends of the bumper reinforcement. The mounting structure of the bumper for vehicles as described in any one of these.   8. The internal protrusions located at both ends in the longitudinal direction of the bumper reinforcement are inclined to the side corresponding to the buckling reduction part with respect to the input direction of a collision load. The mounting structure of the bumper for vehicles as described in any one.   The said buckling reduction part is a bead formed in the vehicle width direction of the upper wall or lower wall as a closed cross-section structure with a rectangular cross section of the bumper stay. The mounting structure of the vehicle bumper described in 1.   The attachment of the vehicle bumper according to any one of claims 1 to 9, wherein the side member is provided with a reinforcing portion on an extension obtained by extending a protruding direction of the internal protruding portion toward the rear of the vehicle. Construction.   The bumper stay and the side member each have a closed cross-sectional structure having a rectangular cross section, and the outer peripheral surface of the bumper stay is substantially coincident with the in-plane direction of the outer peripheral surface of the side member. The vehicle bumper mounting structure according to any one of 10.

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