JP2006347262A - Reinforcing structure of mounting portion to load transmitting portion of vehicular impact absorbing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of a mounting portion to a load transmitting portion of a vehicular impact absorbing member, capable of suppressing or reducing increase of mass, and effectively suppressing or preventing lateral falling at the time of collision. <P>SOLUTION: The crash box 10 is formed by extruding aluminum alloy, and the mounting portion 36 is fixed while inserted in a front end portion 18A of a front side member 18. A first space portion 26 to a fifth space portion 34 are formed in the amounting portion 36, and a first core 40 to a third core 44 are inserted and fitted in advance. The cores 40, 42, 44, the crash box 10, and the front end portion 18A of the front side member 18 are fastened together. Therefore, only required part can be increased in thickness, and lateral falling at the time of the collision can be effectively suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle impact absorbing member that is interposed between a load input portion to which a collision load is input and a load transmission portion to which the collision load is transmitted and absorbs energy at the time of collision by compressing and deforming in an axial direction. It is related with the reinforcement structure of the attaching part to the load transmission part.

  Conventionally, a crash box as an impact absorbing member has been set between a front end portion of a front side member and a front bumper reinforcement. Such a crash box absorbs predetermined energy by receiving an axial compression load from the front bumper reinforcement at the time of a frontal collision (see Patent Document 1 as an example).

Briefly describing the technique disclosed in Patent Document 1, both the front side member and the crash box are formed in a regular hexagonal shape. The front end of the front side member is closed, and six mounting flanges are erected on the front end surface. On the other hand, the crash box is formed in a regular hexagonal cylindrical shape, and a bolt insertion hole is formed in the outer peripheral portion of the rear end portion. The mounting flange at the front end of the front side member is inserted into the rear end of the crash box, and the bolt is inserted from the outside of the crash box and screwed into the mounting flange. A similar structure is adopted for the connection between the front end of the crash box and the front bumper reinforcement.
JP 2001-63626 A

  However, in the case of the above prior art, when a collision load is input from the front side of the front bumper to the front side of the crash box, the load concentrates on the periphery of the bolt insertion hole of the crash box, and the periphery becomes the input load. It can also be considered unbearable. In that case, the crash box may fall sideways, and the expected energy absorption performance may not be fully exhibited.

  In addition, in order to solve the said subject, although increasing the plate | board thickness of the attaching part to the front side member of a crash box is also considered, the demerit which mass increases in that case arises. In particular, if the crush box is an extruded product of aluminum alloy, it will be a long member with the same cross-sectional shape, so attempting to increase the partial thickness will eventually increase the overall thickness of the crash box. , A significant increase in mass.

  In consideration of the above-mentioned fact, the present invention can suppress or reduce an increase in mass, and can effectively suppress or prevent a lateral fall at the time of a collision, and an attachment portion to a load transmission portion of a vehicle impact absorbing member The purpose is to obtain a reinforcing structure.

  According to the first aspect of the present invention, the reinforcing structure of the mounting portion of the vehicle impact absorbing member to the load transmitting portion is attached to the load input portion to which the collision load is input and the other end portion has the collision load. A structure for reinforcing a mounting portion to a load transmitting portion of a shock absorbing member for a vehicle that is attached to a transmitted load transmitting portion and compresses and deforms in an axial direction to absorb energy at the time of a collision. The reinforcing member is attached so that the wall surface overlaps the inner side of the cross section, and the wall overlapping portion of the mounting portion is inserted into the cross section of the load transmitting portion in the state where the mounting portion is inserted into the load transmitting portion. It is characterized by being combined with.

  According to a second aspect of the present invention, the structure for reinforcing the mounting portion of the vehicle shock absorbing member to the load transmitting portion according to the first aspect of the present invention is the first aspect of the invention, wherein the shock absorbing member has a plurality of closed portions along its longitudinal direction. It has a cross-sectional structure having a cross-sectional portion, and is characterized in that a core for reinforcing the attachment portion is inserted into and combined with the closed cross-sectional portion.

  According to a third aspect of the present invention, there is provided the reinforcing structure of the mounting portion to the load transmitting portion of the vehicle impact absorbing member according to the present invention. In the second aspect, the reinforcing member is fastened to the mounting portion and the load transmitting portion together. It is characterized by being.

  According to a fourth aspect of the present invention, there is provided the reinforcing structure of the attachment portion to the load transmitting portion of the shock absorbing member for a vehicle according to the present invention, wherein the reinforcing member is a vehicle width at the closed cross section. It is characterized by being fixed to the outer wall in the direction.

  According to the first aspect of the present invention, when a collision occurs, the collision load is input to the load input unit. The input collision load is transmitted to the load transmission unit via the impact absorbing member. At this time, the impact absorbing member is compressed and deformed in the axial direction, so that energy at the time of collision is absorbed.

  Here, in the present invention, since the mounting portion of the shock absorbing member is configured in a cylindrical shape and the reinforcing member is mounted so that the wall surface overlaps inside the cross section, the mounting portion of the shock absorbing member is attached to that portion, that is, the wall overlapping portion. The part is reinforced. And since this reinforced mounting portion is inserted into the cross section of the load transmitting portion and the wall overlapped portion is coupled to the load transmitting portion, sufficient bending rigidity is imparted to the mounting portion between the shock absorbing member and the load transmitting member. Is done. Accordingly, it is possible to increase the rigidity with respect to a lateral load (load acting on the outside in the vehicle width direction) at the mounting portion of the impact absorbing member, and to suppress and prevent the lateral collapse of the impact absorbing member when a collision load is input. it can.

  In addition, in the present invention, the plate thickness of the unnecessary portion is not changed by increasing the plate thickness with the reinforcing member only in the necessary portion, so that the increase in the mass of the shock absorbing member can be suppressed to the necessary minimum.

  According to the second aspect of the present invention, the shock absorbing member has a plurality of closed cross-sections along the longitudinal direction thereof, and the core is inserted into the closed cross-section and coupled. When the impact absorbing member is made of an extruded material of an aluminum alloy, it is possible to effectively reinforce a portion to be reinforced by selecting a closed cross-sectional portion into which the core is inserted, the thickness of the core, or the like.

  According to the third aspect of the present invention, since the reinforcing member is fastened to the mounting portion and the load transmitting portion, the coupling between the reinforcing member and the mounting portion and the coupling between the mounting portion and the load transmitting portion are separately and independently performed. Compared to the setting, it is possible to reduce the number of parts and the number of assembly steps.

  According to the fourth aspect of the present invention, since the reinforcing member is fixed to the outer wall in the vehicle width direction at the closed cross section, in other words, when the side load is applied to the shock absorbing member, it becomes the fracture side. Since the reinforcing member is set only on the outer side, an increase in mass due to reinforcement can be minimized.

  As described above, according to the first aspect of the present invention, one end portion is attached to the load input portion to which the collision load is input and the other end portion is attached to the load transmission portion to which the collision load is transmitted. A structure for reinforcing a mounting portion to a load transmitting portion of a vehicle impact absorbing member that absorbs energy at the time of compression by compressing and deforming into a cylindrical shape, and the mounting portion is configured in a cylindrical shape so that a wall surface overlaps the inside of a cross section A reinforcing member is attached to the wall, and the wall overlap part of the attachment part is coupled to the load transmission part in a state where the attachment part is inserted into the cross section of the load transmission part, so that only necessary portions are effectively reinforced. As a result, it is possible to suppress or reduce an increase in mass, and to effectively suppress or prevent a lateral fall during a collision.

According to a second aspect of the present invention, there is provided the reinforcing structure for the mounting portion of the vehicle shock absorbing member to the load transmitting portion according to the first aspect of the present invention, wherein the shock absorbing member has a plurality of closed cross-section portions along its longitudinal direction. Since the core for reinforcing the mounting portion is inserted into and combined with the closed cross section, the selection of the closed cross section to insert the core and the thickness of the core Thus, the portion to be reinforced can be effectively reinforced, and as a result, the effect of the present invention according to claim 1 can be obtained easily and efficiently at low cost.

  According to the third aspect of the present invention, the reinforcing structure of the mounting portion to the load transmitting portion of the vehicle impact absorbing member according to the present invention is that the reinforcing member is fastened to the mounting portion and the load transmitting portion in the second aspect of the invention. Compared with the case where the coupling between the reinforcing member and the mounting portion and the coupling between the mounting portion and the load transmitting portion are separately set independently, the number of parts can be reduced, and the number of assembly steps can be reduced. It has an excellent effect that the total cost can be reduced and the assembly work efficiency can be improved.

  According to a fourth aspect of the present invention, there is provided the reinforcing structure for the mounting portion of the vehicle impact absorbing member to the load transmitting portion according to the second or third aspect of the invention. In other words, because the reinforcement member is set only on the outer side, which is the fracture side when a sideways load is applied to the shock absorbing member, the increase in mass due to reinforcement is minimized. As a result, it has an excellent effect that the maximum reinforcement effect can be obtained with a minimum increase in mass.

  Hereinafter, with reference to FIGS. 1 to 5, an embodiment of a reinforcing structure of a mounting portion to a load transmitting portion of a vehicle impact absorbing member according to the present invention will be described. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 5 is a plan view of the front portion of the vehicle body in which the crash box 10 as the shock absorbing member according to the present embodiment is employed. As shown in this figure, a long front bumper reinforcement 12 as a load input portion formed in a substantially U shape in plan view is disposed at the front end portion of the vehicle body in the vehicle width direction in the longitudinal direction. Has been. The front bumper reinforcement 12 is a high-strength member, and a front bumper cover (not shown) is attached to the front side thereof.

  On the other hand, inside the front wheel house 16 where the front wheels 14 are arranged, a high-strength front side member 18 as a load transmitting portion formed in a long shape is arranged with the vehicle longitudinal direction as the longitudinal direction. The rear end portion of the front side member 18 is coupled to the front surface of the front cross member 20. Further, the front end portion of the front side member 18 is disposed at a position (offset position) separated from the front bumper reinforcement 12 by a predetermined distance toward the vehicle rear side. A long crash box 10 is interposed between the front end portion of the front side member 18 and the rear end surface of the front bumper reinforcement 12. The crash box 10 is continuously arranged in the vehicle front-rear direction with respect to the front side member 18.

  FIG. 1 is an overall perspective view of the assembled state of the crash box 10. FIG. 2 is an exploded perspective view in which the core is removed from the crash box 10. 3 and 4 are cross-sectional views of the main part of the crash box 10 respectively.

  As shown in these drawings, the crush box 10 of this embodiment is formed in a uniform cross section (constant cross section) by extruding an aluminum alloy material. Specifically, the crash box 10 has a substantially rectangular cross-sectional shape in the longitudinal direction, and four corners are chamfered. In each chamfer 22, an energy absorbing load adjusting rib 24 is gradually extended in the front-rear direction, and the protruding height gradually increases from the front end toward the rear end. The chamfered portion 22 and the rib 24 are formed by secondary processing (machining) after the crush box 10 is extruded.

  Further, in the cross section of the crash box 10, an upper lateral wall 10B parallel to the top wall portion 10A is integrally formed, and a lower lateral wall 10D parallel to the bottom wall portion 10C is integrally formed. ing. Further, the middle part of the upper side wall 10B and the middle part of the top wall part 10A are divided into left and right by the upper side vertical wall 10E. Similarly, the middle part of the lower side wall 10D and the middle part of the bottom wall part 10C are lower. It is divided into right and left by the side vertical wall 10F.

  As a result, a first space portion 26 and a second space portion 28 having a pentagonal prism shape having a bilaterally symmetrical shape are formed in the upper part inside the cross section of the crash box 10. Similarly, a third space portion 30 and a fourth space portion 32 that are symmetrical pentagonal prism shapes are formed in the lower part in the cross section of the crash box 10. Furthermore, a rectangular parallelepiped fifth space portion 34 is formed between the first space portion 26 and the second space portion 28 and the third space portion 30 and the fourth space portion 32.

  The rear end portion of the crash box 10 is a mounting portion 36 having a hollow substantially rectangular cross section, and the mounting portion 36 is inserted into the front end portion 18A of the front side member 18. Further, the attachment portion 36 is formed with bolt insertion holes 38 at a plurality of locations (two or three locations on each surface).

  Among the first space portion 26 to the fifth space portion 34 as the closed cross-section portion, the first space portion 26, the third space portion 30, and the fifth space portion 34 that are located on the outer side in the vehicle width direction (outer side) The first core 40, the second core 42, and the third core 44, which are reinforcing members whose outer shape is the same as the shape of each space portion and whose inside is hollow, are respectively inserted.

  As shown in FIG. 3 and FIG. 4, the first core 40 is a fixing tool in a broad sense on the attachment portion 36 of the crash box 10 at two locations (two surfaces) of the outer side wall portion 40A and the top wall portion 40B. It is fixed (coupled) with a caulking nut 46 grasped as a fastener. Further, the third core 44 is fixed to the mounting portion 36 of the crash box 10 with a caulking nut 46 at two locations, the outer side wall portion 44A and the bottom wall portion 44B. Further, the second core 42 is fixed to the mounting portion 36 of the crash box 10 with a caulking nut 46 at two locations, the outer side wall portion 42A and the inner side wall portion 42B. A caulking nut 46 is attached to the mounting portion 36 of the crash box 10 for coupling with the front end portion 18A of the front side member 18 even at a position where the core is not inserted.

  Further, in the present embodiment, the front end portion 18A of the front side member 18 is utilized by using a caulking nut 46 that fixes the first core 40, the second core 42, and the third core 44 to the mounting portion 36 of the crash box 10. Further, the mounting portion 36 of the crash box 10 is fastened together with a bolt 48 and a caulking nut 46.

(Action / Effect)
Next, the operation and effect of this embodiment will be described.

  When a frontal collision occurs, the collision load at that time is input to the front bumper reinforcement 12. The input collision load is transmitted to the front end 18 </ b> A of the front side member 18 through the crash box 10. At this time, the crash box 10 is compressed and deformed in the axial direction, so that energy at the time of collision is absorbed.

  Here, in the present embodiment, the mounting portion 36 of the crash box 10 is formed in a cylindrical shape, and the first core 40, the second core 42, and the third core 44 are inserted so that the wall surface overlaps inside the cross section. In addition, since the caulking nut 46 is used for coupling, the attachment portion 36 of the crash box 10 is reinforced at that portion, that is, the wall overlap portion. Then, the reinforced mounting portion 36 is inserted inward of the cross section of the front end portion 18A of the front side member 18, and the wall overlapped portion is coupled to the front end portion 18A with a bolt 48 and a caulking nut 46 (fastened and fixed). A sufficient bending rigidity is imparted to the attachment portion between the crash box 10 and the front end 18A of the front side member 18. Therefore, it is possible to increase the rigidity with respect to the lateral load (load acting on the outer side in the vehicle width direction) at the mounting portion 36 of the crash box 10, thereby suppressing and further preventing the crash of the crash box 10 when the collision load is input. Can do.

  In addition, in the present embodiment, the first core 40 to the third core 44 are inserted into only necessary portions to increase the plate thickness, and the plate thickness of unnecessary portions does not change. Since only such a portion can be reinforced, an increase in the mass of the crash box 10 can be suppressed to a necessary minimum.

  As a result, according to the present embodiment, it is possible to suppress or reduce an increase in mass, and it is possible to effectively suppress or prevent a lateral fall during a collision.

  Further, in the present embodiment, the crash box 10 is configured by extrusion molding of an aluminum alloy, and has a first space portion 26 to a fifth space portion 34 that are a plurality of closed cross-sectional portions along the longitudinal direction thereof, The first core part 40, the third core part 44, and the second core part 42 are inserted into and coupled to the first space part 26, the third space part 30, and the fifth space part 34, respectively. Therefore, it is possible to effectively reinforce a portion to be reinforced by selecting a closed cross-sectional portion into which the core is inserted, the thickness of the core, or the like. As a result, according to the present embodiment, it is possible to realize both the suppression of the increase in mass and the suppression of the lateral collapse with an easy and low-cost configuration.

  Furthermore, in the present embodiment, the mounting portion 36 of the crash box 10 is fastened together with the front end portion 18A of the front side member 18 together with the first core 40 to the third core 44. Compared with the case where the coupling with the core and the coupling between the attachment portion 36 and the front end 18A of the front side member 18 are set separately and independently, the number of parts and the number of assembling steps can be reduced. As a result, according to the present embodiment, it is possible to reduce the total cost and improve the assembly work efficiency.

  In the present embodiment, the first core 40 to the third core 44 are fixed to the outer walls in the vehicle width direction in the first space 26, the third space 30, and the fifth space 34. Then, since the first core 40, the second core 42, and the third core 44 (wall overlap portion) are set only on the outer side which is the fracture side when a crash load is applied to the crash box 10, The increase in mass accompanying reinforcement can be minimized. As a result, according to the present embodiment, the maximum reinforcing effect can be obtained with a minimum mass increase.

[Supplementary explanation of the embodiment]
In the above-described embodiment, the present invention is applied to the crash box 10 set on the front side. However, the present invention is not limited to this, and the present invention is applied to the crash box set on the rear side. Also good.

  Moreover, in this embodiment mentioned above, although the 1st core 40 thru | or the 3rd core 44 was used as a reinforcement member, it is not restricted to this, What is necessary is just a member which can increase board thickness, for example, a cross section A reinforcing member having an open cross-sectional shape such as a U-shape may be used, or a flat reinforcing member may be used.

  Furthermore, in the above-described embodiment, the cross-sectional shape of the crash box 10 is partitioned into a plurality of space portions, but the present invention is not limited thereto, and as a hollow rectangular crash box, a single core is placed inside. Also good.

  Moreover, in this embodiment mentioned above, although the structure which fixes a core to the wall surface of the outer side of the crash box 10 was taken, reinforcement members, such as a core, are provided in this invention of Claim 1 thru | or 3. The structure couple | bonded with parts other than the outer side is also included.

  Furthermore, in the above-described embodiment, the crash box 10 is manufactured by extrusion molding of an aluminum alloy. However, the present invention is not limited to this, and the present invention may be applied to a crash box configured by a method other than extrusion molding. Absent.

  Moreover, in this embodiment mentioned above, although the material of the crash box 10 was made into the aluminum alloy material, not only this but various materials, such as iron, carbon, resin, and glass fiber, can be applied.

  Furthermore, in this embodiment mentioned above, although the wall superposition | polymerization part is comprised as a double wall part, it is good also as not only this but the superposition | polymerization structure of the wall surface more than triple.

It is a whole perspective view of the assembly state of the crash box concerning this embodiment. It is a disassembled perspective view of the state which removed the core from the crash box shown in FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1 showing a vertical cross-sectional structure (a state cut in the vehicle width direction) of the crash box shown in FIG. 1. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 showing a vertical cross-sectional structure (a state cut in the vehicle longitudinal direction) of the crash box shown in FIG. It is a top view which shows the structure of the vehicle body front part by which the crash box which concerns on this embodiment was employ | adopted.

Explanation of symbols

10 Crash box (shock absorbing member)
12 Front bumper reinforcement (load input section)
18 Front side member (load transmission part)
26 First space (closed section)
28 Second space (closed section)
30 3rd space part (closed section)
32 4th space part (closed section)
34 5th space (closed section)
36 Mounting part 40 First core (reinforcing member)
40A Outer side wall (wall on the outer side in the vehicle width direction)
42 Second core (reinforcing member)
42A Outer side wall (outer wall in the vehicle width direction)
44 Third core (reinforcing member)
44A Outer side wall (outer wall in the vehicle width direction)
46 Caulking nut 48 bolt

Claims (4)

For vehicles that have one end attached to a load input unit to which a collision load is input and the other end is attached to a load transmission unit to which the collision load is transmitted, and absorbs energy at the time of collision by compressing and deforming in the axial direction. It is a reinforcement structure of the mounting part to the load transmitting part of the shock absorbing member,
The attachment portion is configured in a cylindrical shape and a reinforcing member is attached so that the wall surface overlaps the inside of the cross section,
The wall overlapping portion of the mounting portion is coupled to the load transmitting portion in a state where the mounting portion is inserted into the cross section of the load transmitting portion.
A structure for reinforcing a mounting portion of a vehicle shock absorbing member to a load transmitting portion. The shock absorbing member has a cross-sectional structure having a plurality of closed cross sections along the longitudinal direction thereof,
A core for reinforcing the mounting portion was inserted into the closed cross section and joined.
The reinforcement structure of the attachment part to the load transmission part of the impact-absorbing member of Claim 1 characterized by the above-mentioned. The reinforcing member is fastened together with the mounting portion and the load transmitting portion.
The reinforcement structure of the attachment part to the load transmission part of the impact-absorbing member of Claim 2 characterized by the above-mentioned. The reinforcing member is fixed to the outer wall of the closed cross section in the vehicle width direction.
The reinforcement structure of the attachment part to the load transmission part of the impact-absorbing member for vehicles of Claim 2 or Claim 3 characterized by the above-mentioned.

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