JP7195894B2 - bumper reinforcement - Google Patents

Description

The present invention relates to bumper reinforcement. In particular, the present invention relates to a bumper reinforcement that is arranged as a core member of a bumper structure installed in the front or rear part of a vehicle and receives a vehicle collision load.

A bumper structure that receives a collision load at the time of a vehicle collision is provided at the front or rear part of the vehicle body. The bumper structure is provided with a bumper reinforcement as a core material. The bumper reinforcement is arranged in an elongated shape in the width direction of the vehicle body, and is supported by being connected to frame members of the vehicle body at both end positions in the width direction of the vehicle body by a bumper support structure. As the bumper support structure, a crash box (C/B) is usually used that absorbs energy during a vehicle collision. In addition, when the crash box is not used, the side members are connected to each other to absorb the energy. Since this energy absorption action is performed in the rigid formed state of the bumper reinforcement, it is important to prevent buckling of the bumper reinforcement and maintain the rigid formed state in the event of a vehicle collision.

By the way, there are various configurations of bumper reinforcement. One of them is a form consisting of a main body member and a reinforcing member. In this case, the main body member is composed of a main member having a hat-shaped cross section and a cover plate member disposed on the opening side of the main member so as to close the opening, and the main body member has a closed cross section. structure. In this structure, the cover plate member is a member on the high load side that receives the collision load when the vehicle collides. The main body member is formed as an elongated member, and its longitudinal direction is arranged in the width direction of the vehicle.

A reinforcement member is disposed within the closed cross-section of the body member to reinforce the strength of the body member. The arrangement position is the central position in the longitudinal direction of the elongated main body member. As a result, reinforcement is achieved when a vehicle collision load is applied to the central position of the elongated main body member.

Conventionally, the reinforcing member has generally been made of steel plate. Recently, however, reinforcing members made of carbon fiber reinforced resin have been proposed in order to reduce the weight of bumper reinforcements (see Patent Documents 1 and 2 below).

The reinforcing member is arranged in the vertical direction of the vehicle on the opposite side (bottom side of the main member having a hat-shaped cross section) from the high load side (cover plate member side) that receives the vehicle collision load. taking the form. As a result, the strength of the side opposite to the high load side is mainly reinforced at the time of collision.

JP 2016-97795 A JP 2018-65452 A

8 and 9 show schematic diagrams of a three-point bending test of the bumper reinforcement 114. FIG. FIG. 8 shows the applied state of the load F (collision load), and FIG. 9 shows the state in which the bumper reinforcement 114 is deformed by the load F of the collision load. The bumper reinforcement 114 is supported by bumper support structures 118 below both ends, and when a collision load F is applied to the upper central portion shown in FIG. 8, the central portion deforms downward and buckles as shown in FIG. . Buckling prevents the bumper support structure 118 from properly absorbing the energy of the crash load.

In the three-point bending test, the high-load side of the cover plate member 124 on which the collision load acts on the bumper reinforcement 114 is concavely deformed, resulting in compressive deformation. On the other hand, the bottom surface side 122A of the main member 122 on the opposite side is convexly deformed and is tensilely deformed. Buckling is more likely to occur on the compressive deformation side than on the tensile deformation side, and once buckling occurs, the bumper reinforcement 114 cannot maintain a high load in a vehicle collision, and the energy absorption of the collision load cannot be performed appropriately. .

By the way, the reinforcement by the reinforcing member of the conventional bumper reinforcement described above is performed on the tensile deformation side of the main body member. That is, it is configured to reinforce the bottom side of the hat-shaped cross section opposite to the high load side (cover plate member side) at the time of vehicle collision, and to reinforce the tensile deformation side.

The problem with the conventional reinforcement method is that the reinforcement mainly focuses on the tensile deformation side, so the forming surface (cover plate member 124) on the high load side buckles due to the concentration of compressive stress, and the cross section of the bumper reinforcement 114 collapses. is likely to occur. Once the cross-sectional collapse occurs, the bumper reinforcement cannot sustain a high load. Therefore, the conventional reinforcement method has the problem that it cannot adequately absorb energy against a strong collision load.

In addition, as in the reinforcing member reinforcement method of Patent Document 2 above, in a form in which a reinforcing member made of fiber reinforced resin is attached from the outside of the main body member with an adhesive, the adhesive strength deteriorates over time, causing peeling of the bonded portion. There is also a risk that a

Generally, the buckling strength is the yield stress of the material and is about 70% of the tensile strength. In view of this point, the present inventor focused on the fact that reinforcement that reduces the generated stress on the compressive deformation side is effective in preventing the cross-sectional structure of the bumper reinforcement from collapsing.

Accordingly, the present invention has been devised based on the inventor's attention as described above. The object is to improve energy absorption performance by preventing buckling of the high load side (compressive deformation side) of the bumper reinforcement at times.

In order to solve the above problems, the bumper reinforcement according to the present invention employs the following means.

A first invention of the present invention is a long bumper reinforcement disposed in the vehicle width direction at the front or rear part of a vehicle body, comprising a body member made of a steel plate having a closed cross-section structure, and the body member A reinforcing member made of resin having a frame shape with a rectangular cross section and having a long side portion arranged in the longitudinal direction of the vehicle in the closed cross section, and positioning means for positioning and arranging the reinforcing member on the main body member. , is a bumper reinforcement.

A second invention of the present invention is the bumper reinforcement of the first invention described above, wherein the reinforcing member is composed of two parts having a U-shaped cross section, and the U-shaped opening side is superimposed and disposed. In addition, the means for positioning the reinforcing member to the main body member is a bumper reinforcement that is fixed by filling a thermoplastic resin.

A third invention of the present invention is the bumper reinforcement of the second invention described above, wherein in the reinforcing member composed of the two parts, the part where the two parts are superimposed is a short side of a rectangular cross section It is a bumper reinforcement that is a part.

A fourth invention of the present invention is the bumper reinforcement according to any one of the first to third inventions described above, wherein the resin reinforcing member is a continuous fiber reinforced resin, and its long side This is a bumper reinforcement in which the fibers of the continuous fiber reinforced resin are oriented in the longitudinal direction of the vehicle.

A fifth invention of the present invention is the bumper reinforcement according to any one of the first invention to the fourth invention described above, wherein the reinforcing member in the elongated bumper reinforcement has an arrangement range of Bumper reinforcements are formed in a predetermined range at the central position of the elongated shape, and both sides thereof are filled with the same thermoplastic resin as the material used for the positioning means.

A sixth invention of the present invention is a bumper reinforcement according to any one of the first to fifth inventions described above, wherein the member on the high load side in the main body member and the reinforcing member are positioned in the position. The facing shape with the molded body surrounded by the thermoplastic resin as means is a bumper reinforcement in which a predetermined range in the central position of the facing range is arranged closer to both sides thereof when viewed in the vertical direction of the vehicle.

A seventh aspect of the present invention is the bumper reinforcement according to any one of the second aspect or the third aspect described above, wherein the reinforcing member is composed of two parts having the same shape. is.

An eighth invention of the present invention is the bumper reinforcement according to any one of the first invention to the seventh invention described above, wherein the positioning member is positioned within the frame shape of the reinforcing member having a rectangular closed cross-section. It is a bumper reinforcement having a space formed by a thermoplastic resin as a means.

According to the present invention of the means described above, while achieving weight reduction by using a resin reinforcing member,
By preventing buckling of the bumper reinforcement on the high load side (compressive deformation side) at the time of vehicle collision, the energy absorption performance can be improved.

FIG. 4 is a schematic diagram showing the arrangement position of the bumper structure with respect to the vehicle body; It is the perspective view which looked at the whole shape of bumper reinforcement from diagonally upper left. FIG. 3 is a perspective view showing the arrangement configuration of the main member and the reinforcing member that constitute the main body member, as viewed in the same manner as in FIG. 2; FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2, showing a schematic diagram of the basic configuration of the present embodiment, and showing a state before a vehicle collision load is applied. FIG. 5 is a diagram showing a state in which a vehicle collision load is added to the state of FIG. 4; FIG. 4 is a schematic diagram showing Embodiment 2; FIG. 3 is a schematic diagram showing Embodiment 3; It is a figure which shows the schematic of the three-point bending test of bumper reinforcement, and shows the state before applying a load. FIG. 9 is a diagram showing a state in which a load is added to the state of FIG. 8;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the "right/left" directional display is the direction viewed from the passenger compartment of the vehicle. In addition, the "front" and "rear" prefixes of each member and part indicate the relative positional relationship in the forward and backward directions of the vehicle when the bumper reinforcement is mounted on the vehicle. Similarly, the “top/bottom” distinction display also indicates the relative positional relationship viewed in the height direction.

First, FIG. 1 shows an arrangement position of a bumper structure 10 in a vehicle. The bumper structure 10 is normally arranged in the vehicle width direction with respect to the vehicle body 12 at the front and rear portions of the vehicle body 12 . In FIG. 1, the front of the vehicle body 12 is indicated by an arrow Fr, and the rear is indicated by an arrow Rr. A vehicle compartment is formed at the location of the vehicle body 12 . The bumper structure 10 comprises a bumper reinforcement 14 , a bumper covering member 16 and a bumper support structure 18 . The bumper reinforcement 14 is provided as a core material for strength of the bumper structure 10 . A bumper covering member 16 is arranged to cover the front surface of the bumper reinforcement 14 . The bumper covering member 16 is arranged on the outermost surface of the bumper structure 10 and is configured in consideration of appearance. Usually, it is made of resin suitable for design molding.

The bumper support structure 18 is disposed between a frame member (not shown) of the vehicle body 12 and the bumper reinforcement 14 at both ends of the bumper reinforcement 14 in the longitudinal direction (the width direction when viewed from the vehicle body 12). . A collision load received by the bumper reinforcement 14 is transmitted to the vehicle body 12 by the bumper support structure 18, thereby absorbing energy. In this embodiment, the bumper support structure 18 is formed of components capable of absorbing impact energy called crash boxes (C/B) and side members.

In the embodiment described below, the case of the bumper reinforcement 14 arranged in the front portion of the vehicle body 12 will be described as an example.

Since the bumper structure 10 of the present embodiment has the arrangement configuration described above, the collision load F acting on the central position of the bumper structure 10 due to a frontal collision of the vehicle is received as follows. First, it is received by the bumper covering member 16 and supported by the bumper reinforcement 14 . The load acting on the bumper reinforcement 14 is received by the vehicle body 12 via crash boxes (C/B) as bumper support structures 18 provided at both ends of the bumper reinforcement 14 . At this time, the crash box (C/B) absorbs the collision energy. The collision energy absorption action by this bumper support structure is appropriately performed in a state in which the rigid body formation state of the bumper reinforcement 14 is maintained. Therefore, when the bumper reinforcement 14 is deformed and buckled by the collision load, the collision load is not properly transmitted from the bumper reinforcement 14 to the bumper support structure 18, and the energy absorption function is not properly performed.

The bumper reinforcement 14 is composed of a body member 20 and a reinforcement member 30, as shown in the cross-sectional view of FIG. The main body member 20 is composed of a main member 22 having a hat-shaped cross section and a cover plate member 24 . The cover plate member 24 is disposed so as to close the opening of the main member 22 having a hat-shaped cross section, and the main member 20 has a closed cross-sectional structure. The reinforcing member 30 has a frame-like shape with a rectangular cross-section, and is arranged inside the body member 20 having a closed cross-sectional structure. The reinforcing member 30 is positioned and arranged with respect to the main member 22 of the main body member 20 by fixing by filling the thermoplastic resin 52 as the positioning means 50 . The bumper reinforcement 14 of the present embodiment is arranged so that the collision load F is input to the cover plate member 24 side.

FIG. 2 is a perspective view of the overall shape of the bumper reinforcement 14 as viewed obliquely from the upper left. The bumper reinforcement 14 has an elongated shape, is arranged in the width direction of the vehicle, and has a curved shape in which both ends in the longitudinal direction are recessed. 4 mentioned above is a cross-sectional view taken along line IV--IV of FIG. FIG. 3 is a perspective view of the main member 22 that forms the main body member 20 and the arrangement configuration of the reinforcing member 30 arranged in the main member 22, as seen diagonally from the upper left as in FIG. As shown in FIG. 3 , the reinforcement member 30 is arranged at the center position of the elongated bumper reinforcement 14 . In this embodiment, the range in which the reinforcing member 30 is arranged is within the range between the crash boxes 18 as support structures arranged at both ends shown in FIG. As a result, the collision load F input to the central position of the bumper reinforcement 14 is received by the rigidity of the bumper reinforcement 14 reinforced by the reinforcing member 30 .

As shown in FIG. 4, a main member 22 having a hat-shaped cross section that constitutes the main body member 20 includes a rear side plate portion 22A, an upper side plate portion 22B, and a lower side plate portion 22C. An upper flange portion 22D is formed extending upward as viewed in FIG. 4 on the opening side of the upper side plate portion 22B. A lower flange portion 22E is formed extending downward as viewed in FIG. 4 on the opening side of the lower side plate portion 22C. The cover plate member 24 is applied to an upper flange portion 22D and a lower flange portion 22E formed on the opening side of the main member 22, and is joined and fixed by welding W1 and W2. Thereby, the main body member 20 has a closed cross-sectional structure. Welding is spot welding in this embodiment, but other welding methods may be used. In addition, the main member 22 and the cover plate member 24 that constitute the main body member 20 are made of steel plate in this embodiment. Note that the cover plate member 24 of the present embodiment has a flat plate shape.

The reinforcing member 30 is disposed inside the body member 20 having a closed cross-sectional structure as shown in FIG. As shown in FIG. 4, the reinforcing member 30 has a rectangular frame shape in cross section, and is arranged so that the long side portion 30A is oriented in the longitudinal direction of the vehicle and the short side portion 30B is oriented in the vertical direction of the vehicle. In this embodiment, the reinforcing member 30 is formed of two parts having a U-shaped cross section, and is composed of an upper member 32 and a lower member 34 . The upper member 32 and the lower member 34 are arranged so that the opening sides of the U-shaped cross section are overlapped to form a closed cross-sectional shape. In the present embodiment, the overlapping position of the U-shape is the position of the short side portion 30B of the rectangular cross section.

In this embodiment, an upper member 32 and a lower member 34 having a U-shaped cross section forming the reinforcing member 30 are formed in the same shape, facing the opening side of the two U-shaped parts 32 and 34 having the same shape. By arranging them together and aligning their openings to form a closed cross-sectional shape. It should be noted that the overlapping position fixation of the openings of the two parts 32 and 34 may be performed by an appropriate means such as an adhesive means. As will be described later, the positioning of the reinforcing member 30 with respect to the main body member 20 is firmly performed by fixing by filling the thermoplastic resin 52, so until then, the fixing method may be performed as positioning in a temporarily fixed state.

The reinforcing member 30 is made of resin. This is intended to suppress the problem of weight increase caused by using the reinforcing member 30 for the bumper reinforcement 14 . That is, the weight of the reinforcing member 30 is reduced. In addition, the resin-made reinforcement member of this embodiment is a continuous fiber reinforced resin. The orientation of the fibers of the continuous fiber reinforced resin in the long side portion 30A of the reinforcing member 30 arranged in the vehicle front-rear direction is the vehicle front-rear direction. As a result, the strength of the long-side portion 30A of the reinforcing member 30 against the load acting in the longitudinal direction of the vehicle is increased. In the present embodiment, the fibers of the continuous fiber reinforced resin in the short side portions 30B of the reinforcing member 30 are also oriented in the vertical direction of the vehicle, which is the forming direction of the short side portions 30B.

The reinforcing member 30 disposed within the closed cross-sectional structure of the body member 20 is positioned with respect to the body member 20 by positioning means 50 . In this embodiment, the body member 20 is positioned by filling the thermoplastic resin 52 into the closed cross-sectional structure of the body member 20 . That is, the body member 20 and the reinforcing member 30 are fixed and positioned by filling the thermoplastic resin 52 .

The positioning method described above is as follows in the case of this embodiment. First, an upper member 32 and a lower member 34 having a U-shaped cross section are combined to form a reinforcing member 30 having a closed cross section. The reinforcing member 30 is placed in a hat-shaped cross-sectional shape at the central position in the width direction of the main member 22 of the main body member 20 of the bumper reinforcement 14 shown in FIG. Then, the opening of the main member 22 having a hat-shaped cross section is closed with a resin filling mold (not shown). The sealing by the resin filling mold is performed over the entire length of the elongated main member 22 . Therefore, both side positions other than the central position where the reinforcing member 30 is arranged can be filled with the resin.

It should be noted that the shape of the sealing surface entering the hat-shaped shape that seals the main member 22 in the resin filling mold is recessed toward the rear. Due to this sealing surface shape, the surface shape of the resin filled in the hat-shaped main member 22 is formed. This surface shape is the surface facing the cover plate member 24 when the opening of the main member 22 is closed by the cover plate member 24 . And it becomes a surface which mutually contacts at the time of a vehicle collision.

In the state where the resin can be filled as described above, the main member 22 and the resin filling mold form an elongated space portion to be filled with the resin. Next, the thermoplastic resin 52 is filled from both sides of the elongated space. As a result, as shown in FIG. 4 , the thermoplastic resin 52 is filled on both the inside and the outside of the reinforcement member 30 having a closed cross-section at the location where the reinforcement member 30 is arranged. By filling the thermoplastic resin 52, the reinforcing member 30 is fixed to the main member 22 of the main body member 20, and is reliably positioned. The overlapping positions of the openings of the upper member 32 and the lower member 34 of the reinforcing member 30 are also fixed together with the filling of the thermoplastic resin 52 .

In addition, in the filling of the thermoplastic resin 52 , the thermoplastic resin 52 is also filled in both side portions other than the portion where the reinforcing member 30 is arranged. As a result, portions other than where the reinforcing member 30 is arranged can be reinforced by the strength of the thermoplastic resin 52 filled.

After the thermoplastic resin 52 filling step is completed, the resin filling mold is removed from the opening of the main member 22, and the cover plate member 24 is attached and fixed by welding W1 and W2. This state is the state shown in FIG.

In the state shown in FIG. 4, the cover plate member 24 of the main body member 20 faces the forming body 54 that surrounds the reinforcing member 30 disposed in the hat-shaped shape of the main body member 20 by being filled with a thermoplastic resin 52. A small space S is formed between the faces. This space S is intended to prevent the cover plate member 24 from coming into contact with the forming body 54 and hindering the assembly when the cover plate member 24 is assembled to the main member 22 . Further, when a collision load is applied to the cover plate member 24, the gap is set to the extent that the load is not hindered by the reinforcing member 30 when the load is received.

In the present embodiment shown in FIG. 4, the cover plate member 24 of the main body member 20 and the forming body 54 surrounding the reinforcing member 30 with the filling resin face each other in a planar shape. On the other hand, the forming body 54 has a convex shape 56 facing forward. The vertical range of the convex shape 56 is substantially the same as the length range of the short side portion 30B of the reinforcing member 30 . As a result, the vehicle collision load received by the cover plate member 24 can be quickly received by the convex shape 56 of the resin molded body 54 and applied to the reinforcing member 30 .

Next, the operation at the time of vehicle collision in the above-described embodiment will be described.

At the time of a frontal collision of the vehicle, a collision load F is input to the center position of the elongated bumper reinforcement 14 in the width direction, as shown in FIGS. 1 and 2 . Then, as explained in the three-point bending test shown in FIGS. 8 and 9, the bumper reinforcement 14 undergoes concave bending deformation when viewed from the direction in which the collision load acts. In this concave bending deformation, the high-load side surface (cover plate member 24) on the load acting side undergoes compressive deformation, and the opposite side surface (rear portion of main member 22) undergoes tensile deformation. Buckling in bending deformation tends to occur on the compressive deformation side. In this embodiment, the collision load F is input to the cover plate member 24, and the cover plate member 24 is likely to undergo compression deformation and buckling at the time of collision.

However, in this embodiment, when the collision load F is applied to the cover plate member 24 as shown in FIG. . Due to this deformation, the cover plate member 24 quickly comes into contact with the opposing surface (convex shape 56 ) of the resin molded body 54 surrounding the reinforcing member 30 . As a result, the reinforcing member 30 receives the collision load and performs a reinforcing action.

The reinforcing action of the reinforcing member 30 for suppressing the bending deformation of the cover plate member 24 is that the rectangular long side portion 30A of the reinforcing member 30 is arranged in the longitudinal direction of the vehicle, which is the same direction as the input action direction of the vehicle collision load. effectively done by That is, the long side portion 30A functions as a tension state against the input of the collision load F, and suppresses the bending deformation of the cover plate member 24. As shown in FIG. This suppressing action works to reduce the stress generated on the compressive deformation side of the cover plate member 24, and effectively works to prevent buckling when the cover plate member 24 undergoes bending deformation. As a result, the bumper reinforcement 14 is maintained in a rigid state, and through the bumper reinforcement 14, it is possible to improve the energy absorbing action performed by the bumper support structure 18 such as the crash box and the side members.

In particular, in the reinforcing member 30 of this embodiment, the long side portions 30A of two sides of the rectangular frame shape are arranged in the same direction as the input direction at positions facing the input of the collision load F, and It is arranged to function quickly against the collision load F. Therefore, bending deformation of the cover plate member 24 in a compressed state is effectively prevented or suppressed.

Furthermore, since the reinforcing member 30 of the present embodiment is made of resin, it is possible to reduce the weight of the reinforcing member compared to conventional reinforcing members generally made of a structure.

Further, by using a continuous fiber reinforced resin and orienting the fibers in the long side portion 30A of the reinforcing member 30 in the longitudinal direction of the vehicle, the strength of the reinforcing member 30 against collision load is further enhanced.

Next, Embodiments 2 and 3 will be described.

FIG. 6 shows a second embodiment. In Example 2, the shape of the cover plate member 24 of the main body member 20 is changed. The cover plate member 24 of the embodiment shown in FIG. 4 had a flat plate shape. A rib 48 is formed so as to protrude in the forward direction of the vehicle. The ribs 48 are formed at two locations in the vertical direction. The position is a position facing the dented portion 57 of the filled resin formed body 54 formed in a convex shape 56 when viewed in the vertical direction of the vehicle.

In Embodiment 2, first, the rigidity of the cover plate member 24 can be increased by the ribs 48 . In addition, when the vehicle collides, the cover plate member 24 and the convex shape 56 on the opposing surface of the forming body 54 surrounding the reinforcing member 30 can be brought into contact with each other more reliably. As a result, the reinforcing action of the reinforcing member 30 at the time of vehicle collision can be performed more effectively.

FIG. 7 shows a third embodiment. In Example 3, the form inside the frame of the rectangular cross-section forming the reinforcing member 30 is changed. In the embodiment shown in FIG. 4, the inside of the frame is entirely filled with the thermoplastic resin 52 as the positioning means 50 . This is a form in which the central region within the frame is formed in the space portion 36 . The spatial shape of the space portion 36 is a small shape corresponding to the rectangular cross section of the reinforcing member 30 . This spatial shape is formed in a range in the longitudinal direction of the bumper reinforcement 14 filled with the thermoplastic resin 52 .

According to the third embodiment, the material of the thermoplastic resin 52 corresponding to the space 36 can be reduced, and the weight can be reduced accordingly.

While specific embodiments of the invention have been described above, the invention may be embodied in many other forms.

For example, in the above embodiment, the reinforcing member was positioned by filling the main body member with thermoplastic resin, but other positioning methods may be used. For example, a positioning method may be employed in which a concave portion is provided on the main body member side, a convex portion is provided on the reinforcing member side, and concave-convex fitting is performed.

Moreover, although the reinforcing member is formed by superimposing two parts having a U-shaped cross section, it may be a single part having an endless rectangular frame shape with a rectangular cross section.

Also, in the case where the reinforcing member is composed of two parts, in the above-described embodiment, the superimposed position is the short side portion of the rectangular cross section, but it may be the long side portion.

Although the resin forming the reinforcing member in the above embodiment is a continuously reinforced resin, any resin that can obtain a predetermined strength may be used. Examples include glass fiber reinforced resin (GFRP) and carbon fiber reinforced resin (CFRP). In this case, GFRP is advantageous in terms of cost, and CFRP can exhibit an excellent strength effect.

When the reinforcing member in the above embodiment is formed of two parts, it has the same U-shaped cross section, but it is not necessarily the same shape, and the U-shaped opening side can be overlapped and configured. If it is

Moreover, before filling the thermoplastic resin as a positioning means for the reinforcing member, two parts having a U-shaped cross section constituting the reinforcing member may be partially fixed in advance by bonding or fusing.

Further, before filling the thermoplastic resin as the positioning means for the reinforcing member, the surface of the vehicle body member of the main body member formed of the steel plate may be processed to have a fine uneven shape. As a result, the so-called anchor effect enables the fixing to be strong.

Moreover, a part of the space formed of the thermoplastic resin in the frame shape of the reinforcing member may reach the reinforcing member.

In addition, the opposing sides of the rectangular cross-section of the reinforcing member may not necessarily be parallel. For example, the main body member may have a trapezoidal shape that matches the angle of the hat-shaped main member.

Also, the rectangular cross section of the reinforcing member may be a so-called chamfered rectangle. That is, it may have a shape in which the long sides and short sides are maintained, and part or all of the corners of a rectangular cross section are chamfered.

Finally, the effects of the above-described embodiments corresponding to the inventions in the above-described "Means for Solving the Problems" will be added.

First, according to the first invention, since the reinforcing member is made of resin, weight reduction can be achieved. The reinforcing member has a rectangular frame shape with a closed cross section, and its long side portion is arranged in the longitudinal direction of the vehicle, which is the same direction as the input direction of the collision load. As a result, the high-load side of the main body member, on which a collision load acts upon a vehicle collision, is reinforced by the reinforcing member. Therefore, it is possible to reduce the stress generated in the main body member on the side of compression deformation at the time of vehicle collision, thereby preventing buckling and improving the energy absorption performance.

Further, according to the first invention, the reinforcing member is positioned and arranged by the positioning means within the closed cross section of the main body member which has a closed cross section structure. As a result, the problem that occurs in the conventional patent document 2 does not occur.

Next, according to the second aspect of the present invention, the reinforcing member is formed of two parts made of resin and having a U-shaped cross section. Therefore, the reinforcing member can be easily molded. In addition, the combination of the two parts is also a method of overlapping the opening side of the U-shape, so that it can be easily assembled.

Further, according to the second aspect of the present invention, positioning of the reinforcing member to the main body member is performed by fixing by filling the thermoplastic resin. Thereby, the reinforcing member can be easily and reliably positioned with respect to the main body member.

Next, according to the third aspect of the present invention, the portion where the reinforcing member composed of two parts is superimposed is the short side portion of the rectangular cross section. As a result, the strength in the longitudinal direction of the vehicle can be increased by the reinforcing member by making the long side portion arranged in the longitudinal direction of the vehicle seamless.

Next, according to the fourth aspect of the present invention, the orientation of the fibers of the continuous fiber reinforced resin in the long side portion of the reinforcing member is the vehicle front-rear direction. This orientation of the fibers can increase the strength of the long side portion of the reinforcing member.

Next, according to the fifth aspect of the present invention, the range of both side positions other than the central position of the bumper reinforcement where the reinforcing member is arranged is also filled with heat for positioning the reinforcing member to the main body member. It is formed by being filled with a plastic resin. As a result, it is possible to reinforce parts other than the position where the reinforcing member is arranged by the filling resin.

Next, according to the sixth aspect of the present invention, the facing shape of the member on the high load side of the main body member and the forming body surrounding the reinforcing member facing the member with the thermoplastic resin is determined when viewed in the vertical direction of the vehicle. Then, the predetermined range of the center position in the facing range is arranged closer to the both sides. As a result, the collision load at the time of vehicle collision can be applied to the reinforcing member quickly, and the reinforcing action can be performed quickly.

Next, according to the seventh invention of the present invention, the reinforcing member is composed of two parts having the same shape. As a result, parts can be shared.

Next, according to the eighth aspect of the present invention, a space is formed within the frame having a rectangular cross-section that forms the reinforcing member. As a result, the material weight of the hollow portion can be reduced.

REFERENCE SIGNS LIST 10 bumper structure 12 vehicle body 14 bumper reinforcement 16 bumper covering member 18 crash box (bumper support structure)
20 body member 22 main member 22A rear side plate portion 22B upper side plate portion 22C lower side plate portion 22D upper flange portion 22E lower flange portion 24 cover plate member 30 reinforcing member 30A long side portion 30B short side portion 32 upper member 34 lower member 36 Spatial part 48 Rib 50 Positioning means 52 Thermoplastic resin 54 Forming body 56 Convex shape 57 Recessed part S Space W1 Welding W2 Welding

Claims (7)

A long bumper reinforcement disposed in the vehicle width direction at the front or rear of the vehicle body,
A body member made of a steel plate having a closed cross-section structure;
a resin reinforcing member having a frame shape with a rectangular cross section in the closed cross section of the main body member and having a long side portion thereof arranged in the vehicle front-rear direction;
positioning means for positioning and arranging the reinforcing member on the body member ;
The reinforcing member is composed of two parts having a U-shaped cross section, and the opening sides of the U-shaped parts are superimposed, and the positioning means of the reinforcing member to the main body member is fixed by filling a thermoplastic resin. Bumpari reinforcement. The bumper reinforcement of claim 1, comprising:
In the reinforcing member composed of the two parts, the part where the two parts are superimposed is the bumper reinforcement which is the short side part of the rectangular cross section . The bumper reinforcement according to claim 1 or claim 2,
In the bumper reinforcement, the reinforcing member made of resin is a continuous fiber reinforced resin, and the fibers of the continuous fiber reinforced resin are oriented in the longitudinal direction of the vehicle in the long side portion thereof . The bumper reinforcement according to any one of claims 1 to 3,
The reinforcing member in the elongated bumper reinforcement is arranged within a predetermined range at the central position of the elongated bumper reinforcement, and both sides thereof are filled with the same thermoplastic resin as the material used in the positioning means. Bumpari reinforcement. The bumper reinforcement according to any one of claims 1 to 4,
The facing shape of the member on the high load side of the main body member and the forming body in which the reinforcing member is surrounded by the thermoplastic resin as the positioning means is a predetermined range in the center position of the facing range when viewed in the vertical direction of the vehicle. are positioned closer to each other than both sides of the bumper reinforcement. A bumper reinforcement according to claim 1 or claim 2 ,
A bumper reinforcement in which the reinforcing member is composed of two parts having the same shape . The bumper reinforcement according to any one of claims 1 to 6 ,
A bumper reinforcement having a space formed of a thermoplastic resin as the positioning means in a frame shape of the reinforcing member having a rectangular cross section .

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