JP2017035937A - Vehicle frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle frame structure that is able to improve the bending strength of a frame by using up the bonding effect and volume effect of a filler.SOLUTION: A center pillar 10 includes: an outer panel 11; an inner panel 12 composing a main closed cross-section C in corporation with this outer panel 11; a first lateral wall part 13a and a pair of first side wall warts 13b, front and rear, and a first reinforcement 13 composing a first auxiliary closed cross-section C1 in corporation with the inner panel 12 within the main closed cross-section C. The center pillar comprises: a second reinforcement 14 composing a second auxiliary closed cross-section C2 in corporation with the first reinforcement 13 within the first auxiliary closed cross-section C1; and a filler 15 filling the second auxiliary closed cross-section C2 and joined to the first and second reinforcements 13, 14. The second reinforcement 14 comprises a second lateral wall part 14a and a second side wall part 14b opposite the first lateral wall part 13a and the first side wall part 14a respectively.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle frame structure, and more particularly to a vehicle frame structure provided with a filler in a closed cross section formed by an outer panel and an inner panel.

Conventionally, a center pillar, which is a vehicle frame, has been formed with a substantially rectangular main closed section that extends in the vertical direction by an outer panel on the outside of the vehicle body and an inner panel on the inside of the vehicle body, and cooperates with the inner panel in the main closed section. A pillar reinforcement (hereinafter abbreviated as “pillar rain”) that works to form a sub-closed cross section is disposed.
Since the center pillar may be deformed inward in the vehicle width direction when the input load is large at the time of a side collision of the vehicle, the center pillar is prevented from being deformed inward in the vehicle width direction for the purpose of ensuring the safety of passengers. Various structures have been proposed.

  The frame structure of Patent Document 1 includes an outer panel having a substantially hat-shaped cross section, an inner panel that forms a main closed cross-section in cooperation with the outer panel, a projecting portion that protrudes to the outside of the vehicle body, and an inner panel within the main closed cross-section. A pair of front and rear pillar abuts on both sides between the outer surface of the front and rear corners of the pillar rain and the inner surface of the front and rear corners of the outer panel. And a filler. Thereby, at the time of a side collision of the vehicle, the initial load input to the outer panel can be transmitted from the filler to the pillar rain and the inner panel, and the reduced load is transmitted to the protrusion after a predetermined time has elapsed from the initial input. Therefore, by maintaining the shape of the protruding portion of the pillar rain, cross-sectional collapse is suppressed and the bending strength of the frame is improved.

JP 2014-189111 A

The buckling mechanism of the closed cross-sectional frame described above is recognized as follows.
When a load exceeding the allowable limit is input to the lateral wall portion perpendicular to the left and right direction of the pillar rain via the outer panel, an elastic buckling wave is generated in the lateral wall portion of the pillar rain, and this elastic buckling wave is generated before and after the lateral wall portion. Are propagated to a pair of side wall portions formed respectively. Then, out-of-plane deformation occurs in the mountain regions of the pair of side walls corresponding to the valley region of the elastic buckling wave generated in the lateral wall.
As a result, the pair of side wall portions bulge in the out-of-plane direction, so that the lateral wall portion is folded in half and the closed cross-section frame buckles.

Since the frame structure of Patent Document 1 is provided with a filler that is in contact with both of the corner outer surface of the pillar rain and the inner surface of the outer panel, the strength of the pillar rain and the outer panel is increased up to a predetermined load. It can be integrated in a pseudo manner through the filler, and the cross-section collapses by suppressing the out-of-plane deformation of the side wall of the pillar rain by the filler supported on the side wall of the outer panel (so-called volume effect of the filler). Is suppressed.
However, when a load exceeding the allowable limit is input to the lateral wall portion of the outer panel, there is a possibility that the volume effect of the filler cannot be sufficiently exhibited due to its structure.
Hereinafter, the effect of suppressing the out-of-plane deformation of the target member (the pillar rain side wall) using the volume of the filler is referred to as a volume effect of the filler, and the filler is applied to the target member using the adhesive force of the filler ( The action of adhering to the outer panel and the side walls of the pillar rain is defined as the adhesive effect of the filler.

In the frame structure of Patent Document 1, when a load is input to the lateral wall portion of the outer panel, the input load is transmitted to the pillar rain through the filler, and at the same time, the stress toward the out-of-plane direction with respect to the side wall portion of the outer panel. Will occur. At this time, the side wall portion of the outer panel is bonded to the filler by the bonding effect of the filler.
When the input load is large and the stress in the out-of-plane direction with respect to the side wall portion of the outer panel exceeds the adhesive force of the filler, the filler is peeled off from the side wall and the adhesive effect of the filler is released.
And after releasing the adhesive effect of the filler, the filler is not supported by the side wall of the outer panel in spite of the fact that the volume effect of the filler can be expected for the performance of the filler. It becomes impossible to suppress the out-of-plane deformation due to the side wall using the volume of the filler, and it becomes difficult to suppress the out-of-plane deformation of the side wall of the pillar rain due to the volume effect of the filler.

  An object of the present invention is to provide a vehicle frame structure or the like that can improve the bending strength of the frame by using up the adhesive effect and volume effect of the filler.

  According to the first aspect of the present invention, there is provided an outer panel on the outer side of the vehicle body, an inner panel on the inner side of the vehicle body that forms a main closed section in cooperation with the outer panel, and a first horizontal wall that is spaced apart from the inner panel and extends substantially parallel to the outer panel. And a pair of front and rear first side wall portions extending from the front and rear end portions of the first horizontal wall portion toward the inner panel, and in the main closed cross section, cooperate with the inner panel to form a first sub closed cross section. A second reinforcing member that forms a second sub-closed cross-section in cooperation with the first reinforcing member in the first sub-closed cross-section, and A filling material filled in the second sub-closed cross section and bonded to the first and second reinforcing members, and the second reinforcing member faces the first lateral wall portion and the first side wall portion, respectively. And a second side wall portion and a second side wall portion. To have.

  In this vehicle frame structure, the filler is filled in the second sub-closed cross section formed by the cooperation of the first and second reinforcing members, and the filler is bonded to the first and second reinforcing members. The volume effect of the filler can suppress the out-of-plane deformation of the first side wall, and even when a force that promotes deformation acts on the second sub-closed cross section, The deformation of the second sub-closed cross section can be suppressed by following the deformation. In addition, since the second reinforcing member to which the filler is bonded is provided with the second lateral wall and the second sidewall facing the first lateral wall and the first sidewall, respectively, the filler for the second reinforcing member is provided. Thus, the bonding effect of the filler can be increased, and the volume effect of the filler can be exhibited against a high input load. Accordingly, it is possible to obtain a vehicle frame having a high bending strength by sufficiently exhibiting the adhesive effect and volume effect of the filler.

According to a second aspect of the present invention, in the first aspect of the invention, the second lateral wall portion and the second sidewall portion are disposed substantially parallel to the first lateral wall portion and the first sidewall portion, respectively, and the second sub-closed cross section. Is formed in a substantially rectangular cross section.
According to this structure, even if it is a case where a 1st reinforcement member deform | transforms, a 1st side wall part and a 1st side wall part cooperate with a 2nd side wall part and a 2nd side wall part, and comprise a parallel link mechanism. Thus, the second reinforcing member can easily follow the deformation of the first reinforcing member, and the adhesive effect of the filler can be maintained with a simple configuration.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the second sub-close section has a corner formed by a part of the first lateral wall part and a part of one first side wall part, and the first It is characterized by being formed with two reinforcing members.
According to this configuration, the second sub-closed cross section can be omitted from the corner formed by a part of the first lateral wall part and a part of the other first side wall part, and cost and weight can be reduced. it can.

The invention of claim 4 is characterized in that, in the invention of any one of claims 1 to 3, the second reinforcing member is made of a material having higher strength than the first reinforcing member.
According to this configuration, the bending strength of the frame can be improved while suppressing the amount of the second reinforcing member that is expensive and heavy.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the vehicle frame structure is a center pillar.
According to this configuration, the bending strength of the center pillar can be improved, and the passenger can be properly protected.

  According to the vehicle frame structure of the present invention, the bending strength of the frame can be improved by using up the adhesive effect and volume effect of the filler.

1 is a perspective view of a left side body structure of a vehicle according to a first embodiment. It is a disassembled perspective view of a center pillar. It is the III-III sectional view taken on the line of FIG. It is explanatory drawing of the frame model for analysis, Comprising: (a) is a perspective view of frame model MA equivalent to Example 1, (b), (c) is a perspective view of frame models MB and MC as a comparative example, respectively. Show. It is a graph which shows the FS characteristic of each frame model. It is a principal part enlarged view of frame model MA, Comprising: (a) has shown the state before load input, (b) has shown the state after load input. It is the principal part enlarged view of frame model MB, Comprising: (a) has shown the state before load input, (b) has shown the state after load input. It is a principal part enlarged view of frame model MC, (a) shows the state before load input, and (b) shows the state after load input.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The following description exemplifies the application of the present invention to a center pillar in a side body structure of a vehicle, and does not limit the present invention, its application, or its use.
In FIG. 1 to FIG. 3, the arrow F direction is assumed to be the front, the arrow L direction is assumed to be the left, and the arrow U direction is assumed to be the upper side.

Embodiment 1 of the present invention will be described below with reference to FIGS.
First, the side body structure 1 will be briefly described.
As shown in FIG. 1, a side body structure 1 of a vehicle is formed with a pair of front and rear openings 2 for getting on and off, and these openings 2 can be opened and closed by a pair of front and rear side doors (not shown). Has been.
The vehicle side body structure 1 includes a roof side rail 3, a side sill 4, a hinge pillar 5, a front pillar 6, a rear pillar 7, a center pillar 10, and the like.
Since the right side body structure is symmetrical to the left side body structure, the left side body structure will be mainly described below.

The roof side rail 3 forms a closed cross-sectional structure extending in the front-rear direction, and constitutes the upper side of the pair of openings 2. The side sill 4 forms a closed cross-sectional structure extending in the front-rear direction, and constitutes the lower side of the pair of openings 2.
The hinge pillar 5 forms a closed cross-sectional structure extending upward from the front end portion of the side sill 4 and is configured so that a front side door can be attached. The front pillar 6 is formed in a closed cross-sectional structure that is inclined downward from the upper end portion of the hinge pillar 5 to the front end portion of the roof side rail 3. The rear pillar 7 is formed in a closed cross-sectional structure that is inclined rearwardly downward from the upper end portion of the rear wheel house to the rear end portion of the roof side rail 3.

Next, the center pillar 10 will be described in detail.
As shown in FIG. 1, the center pillar 10 is formed in a closed cross-sectional structure that connects the intermediate portion of the roof side rail 3 and the intermediate portion of the side sill 4 in the vertical direction so as to partition the pair of front and rear openings 2. ing. The center pillar 10 is configured so that a rear side door can be mounted.
As shown in FIGS. 2 and 3, the center pillar 10 includes an outer panel 11 outside the vehicle body, an inner panel 12 inside the vehicle body, a first reinforcement (hereinafter abbreviated as first rain) 13 (first reinforcing member). ), A second reinforcement (hereinafter abbreviated as second rain) 14 (second reinforcing member), a filler 15 and the like.

The outer panel 11 is formed in a substantially hat shape in cross section, for example, by press-molding mild steel having a thickness of 0.75 mm. The outer panel 11 includes a lateral wall portion 11a substantially orthogonal to the left-right direction, a pair of front and rear side wall portions 11b extending rightward from both front and rear end portions of the lateral wall portion 11a, and a right end of the pair of side wall portions 11b. A pair of front and rear flange portions 11c extending forward and rearward from the respective portions are provided. The inner panel 12 is formed, for example, by press-molding mild steel having a thickness of 0.75 mm. The inner panel 12 includes a lateral wall portion 12a that is substantially orthogonal to the left-right direction, a pair of front and rear flange portions 12c that extend forward and rearward from both front and rear end portions of the lateral wall portion 12a, and the like.
The outer panel 11 and the inner panel 12 constitute a main closed cross section C having a rectangular cross section extending in the vertical direction by welding and joining a pair of flange portions 11c and a pair of flange portions 12c.

The first rain 13 is formed in a substantially hat shape in cross section, for example, by hot press forming (hot stamping) of a high-tensile steel plate (for example, 1180 MPa) having a thickness of 1.40 mm.
The first rain 13 includes a first horizontal wall portion 13a that is substantially orthogonal to the left-right direction, a pair of front and rear first side wall portions 13b that extend rightward from both front and rear end portions of the first horizontal wall portion 13a, A pair of front and rear flange portions 13c and the like extending forward and rearward from the right end portion of the pair of first side wall portions 13b are provided. The first horizontal wall portion 13a is disposed at a predetermined distance from the horizontal wall portion 11a, and is formed such that an intermediate portion in the front-rear direction is recessed rightward. The pair of flange portions 13c are triple joined between the flange portion 11c and the flange portion 12c.
The first rain 13 and the inner panel 12 have a first sub-closed cross section C1 having a rectangular cross section extending in the vertical direction by welding a pair of flange portions 13c and a pair of flange portions 12c in the main closed cross section C. It is configured.

As shown in FIG. 3, the second rain 14 is formed in a substantially M-shaped cross section by hot pressing a high-tensile steel plate (for example, 1800 MPa) having a thickness of 1.40 to 2.30 mm, for example. The second rain 14 is disposed at a front corner formed by the front end side portion of the lateral wall portion 13a and the left end side portion of the front first side wall portion 13b at a position corresponding to the middle stage portion of the first rain 13. ing. The second rain 14 includes a second horizontal wall portion 14a substantially orthogonal to the left-right direction, a second side wall portion 14b extending leftward from a rear end portion of the second horizontal wall portion 14a, and a front end of the second horizontal wall portion 14a. A flange portion 14c extending rightward from the portion, a flange portion 14d extending rearward from the left end of the second side wall portion 14b, and the like. The second horizontal wall portion 14a and the second side wall portion 14b are disposed substantially parallel to the first horizontal wall portion 13a and the first side wall portion 13b so as to exhibit a parallel link function.
The second rain 14 and the first rain 13 are vertically joined by welding the flange portion 14c to the first side wall portion 13b on the front side and welding the flange portion 14d to the right surface portion of the recessed portion of the first lateral wall portion 13a. A second sub-closed section C2 having a rectangular cross section extending in the first sub-closed section C1 is formed. The second sub-closed cross section C2 has an arrangement position defined so as to include a mounting portion of a hinge bracket (not shown) of the rear side door.
Since the first sub-closed section C1 constitutes a parallel link mechanism having four sides, the deformation of the single corner is restricted, so that the cross-section is prevented from collapsing.

The second sub closed cross section C2 is filled with a filler 15 made of an epoxy-based synthetic resin material. The filler 15 has adhesiveness capable of adhering to a metal. Therefore, when the filler 15 is filled in the second sub-closed cross-section C2, the filler 15 is a part of the first lateral wall portion 13a in contact, a part of the first side wall portion 13b on the front side, and the second lateral wall. It adhere | attaches with the predetermined | prescribed adhesive force with respect to the part 14a and the 2nd side wall part 14b. Hereinafter, the adhesive action by the filler 15 is referred to as an adhesive effect.
Moreover, the filler 15 is suppressing the out-of-plane deformation of the 1st side wall part 13b which bulges forward, when the compression load which goes rightward is input into the 1st horizontal wall part 13a. Hereinafter, the effect of suppressing the out-of-plane deformation of the first side wall portion 13b using the volume of the filler 15 itself is referred to as a volume effect.

Next, functions and effects of the vehicle frame structure of the present embodiment will be described.
As shown in FIGS. 4A to 4C, frame models MA to MC having a predetermined length were prepared, and the FS characteristics of the respective frame models MA to MC were analyzed by CAE (Computer Aided Engineering). .
The frame model MA has the same configuration as that of the first embodiment, and is a model in which the second rain 24 is installed and the filling material 25 is filled in the second sub closed cross section C2. The frame model MB is a model in which the filler 25 is omitted from the configuration of the frame model MA. The frame model MC omits the second rain 24 from the configuration of the frame model MB, and a pair of fillings that are in contact with both the outer surfaces of the front and rear corners of the first rain 23 and the inner surfaces of the front and rear corners of the outer panel 21 respectively. This is a model provided with a material 26. The fillers 25 and 26 are the same material components as the filler 15.
A load F indicated by an arrow was applied to bend the axis of the frame models MA to MC while both ends of the frame models MA to MC were fixed, and the displacement of the load point and the load (reaction force) were analyzed. .

FIG. 5 shows the analysis result by CAE.
The FS characteristic LA of the frame model MA is indicated by a solid line, the FS characteristic LB of the frame model MB is indicated by a broken line, and the FS characteristic LC of the frame model MC is indicated by a two-dot chain line.
As shown in FIG. 5, the allowable limit load causing buckling was the highest in the frame model MA and the lowest allowable limit load in the frame model MB.
In addition, the frame model MA was the longest in terms of durability time for maintaining the allowable limit load.

As shown in FIG. 6A, the second sub-closed section C2 of the frame model MA is in a solid state by the filler 25 before the load F is input. Therefore, even if the load F is input, the second sub-closed cross-section C2 is not easily contracted in the load input direction. Therefore, the out-of-plane deformation of the first side wall 23b is suppressed by the volume effect of the filler 25, and the cross-section collapses. The structure is difficult to generate.
In addition, as shown in FIG. 6B, after the load F is input, even if the stress f toward the load input orthogonal direction is generated in the first side wall portion 23b in the frame model MA, the second rain 24 is Since it is fixed to one rain 23, the second side wall portion 24b has substantially the same deformation behavior as the first side wall portion 23b. Therefore, the first side wall portion 23b is not peeled off from the filler 25, the adhesion effect is maintained, and the volume effect of the filler 25 is sufficiently exhibited. Thereby, the allowable limit load can be increased, and it is estimated that the allowable limit load state is maintained for a long time.

As shown in FIG. 7A, before the input of the load F, the second sub closed section C2 of the frame model MB is in a hollow state.
As shown in FIG. 7B, in the frame model MB after the input of the load F, when the lateral wall portion 21a of the outer panel 21 comes into contact with the first lateral wall portion 23a of the first rain 23, the first sidewall portion 23b Stress f is generated in the direction perpendicular to the load input. The first side wall portion 23b is deformed out of plane by the stress f, and the frame model MB is buckled at a lower allowable limit load than the frame model MA.

As shown in FIG. 8A, before the load F is input, in the frame model MC, the side wall portion 21a, the side wall portion 21b, the first side wall portion 23a, and the first side wall portion 23b are bonded to the filler 26. .
As shown in FIG. 8B, after the input of the load F, when a stress g directed in the direction perpendicular to the load input is generated on the side wall 21b of the outer panel 21, the deformation behavior of the outer panel 21 and the first rain 23 is different. Therefore, when the stress g exceeds the adhesive force of the filler 26, the filler 26 is peeled from the side wall portion 21b. Therefore, when the stress f in the direction perpendicular to the load input is generated in the first side wall portion 23b, the filler material 26 is not supported (adhered) to the side wall portion 21b. Deformation cannot be suppressed, and buckling occurs in the first rain 23.

According to the vehicle frame structure, the filling material 15 is filled in the second sub-closed cross-section C2 formed by the cooperation of the first and second rains 13 and 14, and the first and second rains 13 and 14 are filled. Since the filler 15 is bonded, the volume effect of the filler 15 can suppress the out-of-plane deformation of the first side wall portion 13b, and the case where a force that promotes deformation acts on the second sub-closed cross section C2. Even so, it is possible to cause the filler 15 to follow the deformation of the second sub-closed section C2 and to suppress the collapse of the second sub-closed section C2.
In addition, since the second rain 14 to which the filler 15 is bonded is provided with the second lateral wall portion 14a and the second sidewall portion 14b that face the first lateral wall portion 13a and the first sidewall portion 13b, respectively, The adhesion area of the filler 15 to the rain 14 can be increased to increase the adhesion effect of the filler 15, and the volume effect of the filler 15 can be exhibited against a high input load. Thereby, it is possible to obtain a vehicle frame having a high bending strength by sufficiently exhibiting the adhesive effect and volume effect of the filler 15.

The second lateral wall portion 14a and the second side wall portion 14b are disposed substantially parallel to the first lateral wall portion 13a and the first side wall portion 13b, respectively, and the second sub-closed section C2 is formed in a substantially rectangular shape.
According to this, even when the first rain 13 is deformed, the first lateral wall portion 13a and the first side wall portion 13b cooperate with the second lateral wall portion 14a and the second side wall portion 14b to perform the parallel link mechanism. By configuring, the second rain 14 can easily follow the deformation of the first rain 13, and the adhesive effect of the filler 15 can be maintained with a simple configuration.

  Since the second sub-closed section C2 is formed by the corners formed by a part of the first side wall part 13a and a part of the first side wall part 13b on the front side and the second rain 14, the first side wall part 13a. The second sub-closed cross section C2 can be omitted from the corner portion formed by a part of the first side wall part 13b on the rear side and the cost and weight can be reduced.

  Since the second rain 14 is made of a material stronger than the first rain 13, the bending strength of the frame can be improved while suppressing the amount of the second rain 14 that is expensive and heavy.

  Since the vehicle frame structure is a center pillar, the bending strength of the center pillar 10 can be improved, and an occupant can be properly protected.

Next, a modified example in which the embodiment is partially changed will be described.
1) In the above embodiment, an example of a center pillar has been described. However, if it is a vehicle frame that requires a high allowable load limit for a long time, it may be applied to any of the front pillar, rear pillar, and other frames. good.

2] In the above embodiment, the second sub-closed cross section is formed by the corners formed by the part of the first lateral wall part of the first rain and the part of the first side wall part of the front side and the second rain. However, the second sub-closed cross section may be formed by a corner formed by a part of the first lateral wall part of the first rain and a part of the rear first side wall part and the second rain. . Moreover, you may form a 2nd sub closed cross section in the corner | angular part of the front and back both sides of a 1st rain.

3) In the above-described embodiment, the example in which the recessed portion that is recessed into the vehicle compartment side and extends vertically is provided in the middle portion in the front-rear direction of the first rain, but at least the first sub-closed section is prevented from being broken. It is only necessary to form a ridge line for this purpose, and it is possible to provide a projecting portion that protrudes outward from the vehicle and that extends vertically.
A plurality of beads and ribs extending vertically may be formed on the lateral wall portion of the first rain.

4) In addition, those skilled in the art can implement the present invention with various modifications added without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

C main closed cross section C1 first sub closed cross section C2 second sub closed cross section 10 center pillar 11 outer panel 11a side wall 11b side wall 12 inner panel 13 first rain 13a first side wall 13b first side wall 14 second rain 14a second 2 side wall part 14b 2nd side wall part 15 Filler

Claims (5)

An outer panel on the outer side of the vehicle body, an inner panel on the inner side of the vehicle body that forms a main closed section in cooperation with the outer panel, a first horizontal wall portion that is spaced apart from the inner panel and extends substantially parallel to the outer panel, and the first horizontal wall portion And a pair of front and rear first side wall portions extending toward the inner panel from both ends in the front-rear direction, and a first reinforcing member that forms a first sub-closed cross-section in cooperation with the inner panel in the main closed cross-section. In a vehicle frame structure provided with
A second reinforcing member that forms a second sub-closed cross-section in cooperation with the first reinforcing member within the first sub-closed cross-section;
A filler filled in the second sub-closed cross section and bonded to the first and second reinforcing members;
The vehicle frame structure characterized in that the second reinforcing member includes a second lateral wall portion and a second sidewall portion that face the first lateral wall portion and the first sidewall portion, respectively.   The second lateral wall portion and the second side wall portion are disposed substantially parallel to the first lateral wall portion and the first side wall portion, respectively, and the second sub-closed cross section is formed in a substantially rectangular cross section. The vehicle frame structure according to claim 1.   2. The second sub-closed section is formed by a corner formed by a part of the first lateral wall part and a part of one first side wall part and the second reinforcing member. Or the frame structure for vehicles of 2.   The vehicle frame structure according to any one of claims 1 to 3, wherein the second reinforcing member is made of a material having a strength higher than that of the first reinforcing member.   The vehicle frame structure according to any one of claims 1 to 4, wherein the vehicle frame structure is a center pillar.