JP5509808B2 - Vehicle frame structure - Google Patents

Description

  The present invention relates to a structure of a vehicle frame that forms a part of a vehicle body in a vehicle such as an automobile. More specifically, the present invention relates to a resin-made structure for reinforcing the closed cross-section member inside a metal closed cross-section member. The present invention relates to a vehicle frame structure to which a reinforcing member is attached.

  As is well known, vehicle frames (body frames) such as side pillars and side sills that form part of the body of a vehicle such as an automobile have high strength and high rigidity to ensure the safety of passengers in the event of a vehicle collision. In addition, there is a demand for weight reduction in order to improve fuel efficiency. For this reason, in many cases, the body frame is configured as a closed cross-section member in which a metal plate material is formed in a closed cross-section shape.

  There is also known a vehicle body frame in which a reinforcing member is attached inside a metal closed cross-section member to reinforce the closed cross-section member. For example, Patent Document 1 discloses a material in which a metal reinforcing member is disposed on a compression side of bending in a B pillar having a closed cross-sectional structure and is reinforced. Further, for example, in Patent Document 2, a resin reinforcing member having a partition wall that divides the hollow portion into a plurality of divided chambers in a cross section is disposed in a hollow portion of a hollow structure such as a pillar, and at least one of them is provided. There is disclosed one in which one of the divided chambers is blocked by a foam.

JP 2008-279904 A JP 2001-191949 A

  However, as disclosed in Patent Document 1 and Patent Document 2, when a reinforcing member is attached and reinforced inside the closed cross-section member, an increase in weight is caused. Although the thing of the said patent document 2 can suppress and reinforce the increase in weight by using a resin-made reinforcement member compared with the thing of the patent document 1, body frames, such as a side pillar and a side sill. Therefore, further improvement in weight reduction is desired. On the other hand, the vehicle body frame, as described above, for example, when a bending load is input to the vehicle body frame from the outside in order to ensure the safety of the occupant when receiving a collision from the side of the vehicle body (so-called side collision). Therefore, it is required to secure a sufficient bending resistance so as not to bend and deform. For this reason, in the body frame, how to efficiently secure the bending resistance while reducing the weight is an important issue.

  As a result of repeating various test studies, the inventors of the present application, as will be described in detail later, when a bending load is input from the outside to the closed cross-section member formed in a substantially rectangular closed cross-section shape, First, when the bending load is input, the first surface portion on which the force in the compression direction acts is deformed inward of the closed cross-section member along the load input direction, and adjacent to the first surface portion along with this deformation. The side surface portion swells outward of the closed cross-section member to cause out-of-plane deformation, and the second surface portion on which a force in the tensile direction acts when a load is input is deformed inward of the closed cross-section member, It was found that the closed cross-section member was bent and deformed and buckled.

  Based on this knowledge, if the bending deformation of the first surface portion toward the inward side of the closed cross-section member that can occur at the beginning of the bending deformation of the closed cross-section member can be suppressed, it is effective that the closed cross-section member is bent and deformed. It can be suppressed, and it is considered that the bending resistance of the closed cross-section member can be efficiently secured while reducing the weight.

  Accordingly, the present invention provides a vehicle frame structure in which a resin reinforcing member is attached to the inside of a metal closed cross-section member, and the inward side of the closed cross-section member that can occur at the initial stage of bending deformation of the closed cross-section member. An object of the present invention is to provide a vehicle frame structure capable of effectively suppressing bending deformation of a first surface portion and efficiently ensuring bending resistance while reducing weight.

Therefore, the vehicle frame structure according to claim 1 of the present application has a vehicle frame structure in which a resin-made reinforcing member is attached along the longitudinal direction of the closed cross-section member inside the metal closed cross-section member. In the closed cross-section member, when a bending load is input from the outside, a first surface portion on which a force in the compression direction acts, a second surface portion on which a force in the tension direction acts, and the first surface portion A flat plate portion disposed along the first surface portion and adhesively bonded to the first surface portion; and the flat plate portion from the flat plate portion. a rib consisting of rib arranged in a grid pattern extending toward the second face, have a, the rib, the closed-section member from the end portion side of the closed-section member in a direction crossing the closed-section member the height of the rib is formed so as to be lower toward the central side, this Is obtained by it said.

  The invention according to claim 2 of the present application is characterized in that, in the invention according to claim 1, the rib portion is configured to increase in strength as it approaches the flat plate portion. .

  Furthermore, in the invention according to claim 3 of the present application, in the invention according to claim 2, the size of the opening formed by the lattice-shaped rib is reduced as the flat plate portion is approached, or the rib The thickness is increased as it approaches the flat plate portion.

  Still further, the invention according to claim 4 of the present application is the invention according to any one of claims 1 to 3, wherein the rib portion is the closed cross-section member from the longitudinal direction end side of the closed cross-section member. It is comprised so that intensity | strength may increase as it approaches the longitudinal direction center side.

  Still further, in the invention according to claim 5 of the present application, in the invention according to claim 4, the size of the opening formed by the lattice-shaped rib is the closed cross section from the longitudinal direction end side of the closed cross section member. It is formed smaller as it approaches the longitudinal direction center side of the member, or the rib is formed thicker as it approaches the longitudinal direction center side of the closed section member from the longitudinal end portion side of the closed section member. , Is characterized by that.

  According to the vehicle frame structure of the first aspect of the present application, when a bending load is input from the outside, the first is directly performed by the flat plate portion of the reinforcing member that is adhesively bonded to the first surface portion on which the force in the compression direction acts. The rigidity of the surface portion can be increased to suppress bending deformation of the first surface portion, and the first surface portion can be made strong against compression by ribs extending from the flat plate portion and arranged in a lattice shape. Bending deformation of the first surface portion toward the inward side of the closed cross-section member that can occur at the initial stage of bending deformation of the cross-section member can be effectively suppressed, and bending resistance can be efficiently ensured while achieving weight reduction.

  Moreover, according to the invention which concerns on Claim 2 of this application, since the rib part is comprised so that intensity | strength may increase as it approaches a flat plate part, the inhibitory effect with respect to the bending deformation of a 1st surface part can be heightened. , The effect can be achieved more effectively.

  Furthermore, according to the invention according to claim 3 of the present application, the size of the opening formed by the grid-like ribs is reduced as the plate portion approaches, or the rib thickness approaches the plate portion. Since it is formed thick, the above-described effect can be realized more specifically with a relatively simple structure.

  Furthermore, according to the invention according to claim 4 of the present application, the rib portion is configured such that the strength increases as it approaches the longitudinal direction center side of the closed cross-section member from the longitudinal end portion side of the closed cross-section member. Thus, when the closed cross-section member is bent and deformed, the effect of suppressing the bending deformation of the first surface portion can be enhanced on the central side in the longitudinal direction of the closed cross-section member that is likely to be bent. be able to.

  Furthermore, according to the invention according to claim 5 of the present application, as the size of the opening formed by the grid-like ribs approaches the longitudinal direction center side of the closed cross-section member from the longitudinal end portion side of the closed cross-section member. Since the rib is formed thin or thick as the thickness of the rib approaches the longitudinal direction center side of the closed cross-section member from the longitudinal end side of the closed cross-section member, the above-described effect can be achieved by a relatively simple structure. This can be realized more specifically.

1 is a perspective view showing a vehicle body frame to which a vehicle frame structure according to a first embodiment of the present invention is applied. FIG. 2 is a cross-sectional view of the vehicle body frame taken along line Y2a-Y2a and line Y2b-Y2b in FIG. It is a figure which shows the vehicle body frame to which the frame structure for vehicles which concerns on the 2nd Embodiment of this invention is applied. It is a perspective view which shows the principal part of the vehicle body frame to which the vehicle frame structure which concerns on the 3rd Embodiment of this invention is applied. FIG. 5 is a cross-sectional view of the vehicle body frame taken along lines Y5a-Y5a and Y5b-Y5b in FIG. It is a perspective view which shows the vehicle body frame to which the frame structure for vehicles which concerns on the 4th Embodiment of this invention is applied. It is a perspective view which shows the vehicle body frame to which the frame structure for vehicles which concerns on the 5th Embodiment of this invention is applied. FIG. 8 is a cross-sectional view of the vehicle body frame taken along lines Y8a-Y8a and Y8b-Y8b in FIG. It is explanatory drawing for demonstrating the simulation for analyzing the bending deformation behavior of the vehicle body frame formed in the closed cross-sectional shape. It is a perspective view which shows the result of having analyzed the bending deformation behavior of the vehicle body frame by simulation. It is sectional drawing which shows the cross section of the bending part of the vehicle body frame in FIG. It is a graph which shows the relationship between the downward stroke of the indenter which adds a load to a vehicle body frame, and the reaction force with respect to this load, and the relationship between the downward stroke of an indenter, and energy absorption amount.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, terms that mean a specific direction such as “up”, “down”, “right”, “left” and other terms including those terms are used. In order to facilitate understanding of the referenced invention, the technical scope of the present invention is not limited by the meaning of these terms.

  The inventors of the present application, in a vehicle frame structure in which a resin reinforcing member is attached inside a metal closed cross-section member, efficiently secures the bending resistance of the closed cross-section member while reducing the weight. In the development of a vehicle frame structure that can be used, first, a simulation analysis by CAE (Computer Aided Engineering) is performed on the deformation behavior when a bending load is input from the outside to the body frame formed in a closed cross-sectional shape. went.

FIG. 9 is an explanatory diagram for explaining a simulation for analyzing the bending deformation behavior of a vehicle body frame formed in a closed cross-sectional shape, and FIG. 9A shows the bending deformation behavior of the vehicle body frame. FIG. 9B is a diagram showing a state in which a load is applied to the vehicle body frame and the vehicle body frame is curved, and FIG. 10 shows a result of simulation analysis of the bending deformation behavior of the vehicle body frame. FIG. 11 is a cross-sectional view showing a cross section of a bent portion of the vehicle body frame in FIG. In FIG. 10, the amount of deformation of each part of the body frame is represented by shades of color, and the larger the amount of deformation, the darker the color. 10 and 11 show the progress of bending deformation of the body frame in the order of (a), (b), (c), and (d), and the indenter descending stroke shown in FIG. The cases of S ₀ , S ₁ , S ₂ and S ₃ are shown in order.

  In this simulation, as shown in FIGS. 10 and 11, as a body frame 200 formed in a metal closed cross-sectional shape, an upper surface portion 200a and a lower surface provided in parallel with the upper surface portion 200a in a state of being separated from the upper surface portion 200a. Portion 200b, and a side surface portion 200c between the upper surface portion 200a and the lower surface portion 200b, that is, a right side surface portion 200c and an upper surface between the right end portion of the upper surface portion 200a and the right end portion of the lower surface portion 200b in FIGS. A bending load is applied to the body frame 200 from the outside using a model having a left side surface portion 200c between a left end portion of the portion 200a and a left end portion of the lower surface portion 200b, and having a substantially rectangular closed cross section. Then, a simulation analysis was performed on the deformation behavior when the body frame 200 was bent and deformed.

  Specifically, as shown in FIG. 9 (a), a vehicle body frame 200 having a predetermined length X1 is supported by two fixing points 201 separated by a predetermined distance X2 shorter than the length X1. A load inputted from the outside at the time of a vehicle collision via the indenter 202 by lowering the indenter 202 at a constant speed from the upper side to the central portion P1 in the longitudinal direction of the upper surface portion 200a of the body frame 200 corresponding to the intermediate position of the fixed point 201. Was applied to the body frame 200, and the bending deformation behavior of the body frame 200 was examined.

  When the bending load F is applied to the vehicle body frame 200 from the outside in this way, as shown in FIG. 9B, the vehicle body frame 200 is bent and deformed in a convex shape downward. In the upper surface portion 200a, a compressive stress is generated from both ends in the longitudinal direction to generate a compressive stress, and in the lower surface portion 200b, a tensile force is applied from both ends in the longitudinal direction to generate a tensile stress. Further, in the side surface portion 200c, compressive stress is generated on the upper surface portion 200a side from the neutral shaft 210, and tensile stress is generated on the lower surface portion 200b side from the neutral shaft 210.

  FIG. 12 is a graph showing the relationship between the descending stroke of the indenter that applies a load to the vehicle body frame and the reaction force against the load, and the relationship between the descending stroke of the indenter and the amount of energy absorption. In FIG. The descending stroke of the indenter 202 descending with bending deformation of the body frame 200 from the position in contact with the upper surface portion 200a of the body frame 200 is shown on the horizontal axis, the reaction force F ′ against the load F is displayed on the left vertical axis, and the energy absorption amount EA Is shown on the right vertical axis. The energy absorption amount EA is energy that can be absorbed when the body frame 200 is bent and deformed, and is represented by the product of the reaction force F ′ with respect to the load F and the descending stroke of the indenter 202.

  The bending deformation behavior of the vehicle body frame 200 by simulation analysis will be described with reference to FIGS.

As shown in (a) of FIG. 10 and FIG. 11, if the indenter 202 is lowered from above the vehicle body frame 200, downward stroke of the indenter indenter 202 is positioned in contact with the upper surface portion 200a is _{S 0,} the vehicle body In the frame 200, the apex P2 of the corner portion 200d between the upper surface portion 200a and the side surface portion 200c is positioned substantially vertically above the apex P3 of the corner portion 200e between the lower surface portion 200b and the side surface portion 200c. Note that these vertices P2 and P3 represent the vertices of the corner portions 200d and 200e in the cross section having the bent portion when the body frame 200 is bent, that is, the central portion P1.

  When the indenter 202 is moved downward from this state and a load F is applied to the vehicle body frame 200, the reaction force F ′ against the load F increases as the descending stroke of the indenter 200 increases as shown in FIG. The vehicle body frame 200 is deformed by being curved downwardly, and the vehicle body frame 200 is subjected to a compressive force on the upper surface portion 200a and a tensile force on the lower surface portion 200b, and a load F is applied to the center. It is bent and deformed from the part P1.

Then, the reaction force F 'is maximized with respect to the load F when downward stroke of the indenter 202 is S _1, as shown in (b) of FIG. 10 and FIG. 11, the body frame 200 is curved in a convex shape on the lower side And deformed inwardly of the vehicle body frame 200 formed in a closed cross-sectional shape, and along with this deformation, the side surface portion 200c adjacent to the upper surface portion 200a bulges outward in the cross-sectional direction and deforms out of plane. The apex P2 of the corner portion 200d is inclined outward from the substantially vertical direction with respect to the apex P3 of the corner portion 200e, and a portion having a large deformation amount in the corner portion 200d as shown by a deformation portion α in FIG. Occurs. Further, the lower surface portion 200b is displaced inward of the vehicle body frame 200 along with this deformation. Note that the maximum load F′max that maximizes the reaction force F ′ with respect to the load F represents the degree of bending resistance.

  When the descending stroke of the indenter 202 is further increased, as shown in FIG. 12, the reaction force F ′ with respect to the load F is decreased along with the descending stroke of the indenter 202, as shown in FIGS. 10 and 11 (c) and (d). As shown, the vehicle body frame 200 is further bent and deformed, and the upper surface portion 200a is further deformed inward of the vehicle body frame 200. With this deformation, the side surface portion 200c further bulges outward in the cross-sectional direction. While the deformation occurs, the lower surface portion 200d is further displaced inward of the body frame 200, and the body frame 200 is bent and deformed and buckled.

  From this simulation analysis result, the inventors of the present application, when a bending load is input from the outside to a closed cross-section member formed in a substantially rectangular closed cross-section shape, the compression is first performed when the bending load is input. The first surface portion on which the direction force acts is deformed inward of the closed cross-section member along the input direction of the load, and along with this deformation, the side surface portion adjacent to the first surface portion is the outer side of the closed cross-section member. When the load is input, the second surface part to which the force in the tensile direction acts is deformed inward of the closed cross-section member, and the closed cross-section member is bent and deformed to buckle. I found out.

  In addition to the simulation analysis described above, the inventors of the present application also applied the bending behavior to the actual body frame formed in a closed cross-sectional shape by inputting a bending load from the outside to the body frame. An experiment was conducted, and in this experiment as well, a result almost similar to the simulation analysis result described above was obtained.

  Therefore, if the deformation of the first surface portion toward the inward side of the closed cross-section member that can occur at the beginning of the bending deformation of the closed cross-section member can be suppressed based on the simulation analysis results and the experimental results, the closed cross-section member is bent and deformed. It is considered that bending resistance can be effectively suppressed, and bending resistance can be efficiently secured while achieving weight reduction.

Hereinafter, a vehicle frame structure according to an embodiment of the present invention will be described.
FIG. 1 is a perspective view showing a vehicle body frame to which the vehicle frame structure according to the first embodiment of the present invention is applied, and FIG. 2 is a view of the vehicle body frame taken along lines Y2a-Y2a and Y2b-Y2b in FIG. 2A is a cross-sectional view of the vehicle body frame along the line Y2a-Y2a, and FIG. 2B is a cross-sectional view of the vehicle body frame along the line Y2b-Y2b. In FIG. 1 and FIGS. 3, 4, 6, and 7, which will be described later, in order to clearly show the reinforcing member in the frame body, the frame body is indicated by a one-dot chain line, and this is shown in a transparent state. .

  As shown in FIGS. 1 and 2, a vehicle body frame 1 to which the vehicle frame structure according to the first embodiment of the present invention is applied includes a frame body 10 as a closed cross-section member, and a longitudinal direction of the frame body 10. And a reinforcing member 20 attached to the inside of the frame main body 10.

  The frame body 10 includes a first plate member 11 obtained by pressing a metal plate material such as a steel plate into a cross-sectional hat shape, and a second plate shape made of a metal plate material such as a steel plate. It is comprised from the member 12. FIG. The first plate member 11 includes a bottom surface portion 11a formed in a substantially planar shape, a side surface portion 11b extending in a substantially vertical direction on both sides of the bottom surface portion 11a, and a flange portion extending outward in a substantially right angle direction from the side surface portion 11b. 11c, the second plate member 12 includes a flat portion 12a formed in a substantially flat shape, and the flange portion 11c of the first plate member 11 is a flat surface of the second plate member 12. The frame body 10 is formed in a substantially rectangular closed cross section by being brought into contact with the portion 12a and joined by spot welding.

  The reinforcing member 20 is obtained by molding a resin material by injection molding or the like, and is attached to the inside of the frame body 10 in order to reinforce the frame body 10. The reinforcing member 20 includes a flat plate portion 21 formed in a substantially rectangular shape according to the shape of the bottom surface portion 11a of the first plate member 11, and a lattice shape extending from the flat plate portion 21 in a substantially right angle direction. And a rib portion 23 composed of the provided ribs 22. The reinforcing member 20 is a frame in which the flat plate portion 21 is disposed along the bottom surface portion 11 a of the first plate-shaped member 11, is adhesively bonded to the bottom surface portion 11 a by the foamable adhesive 27, and crosses the frame body 10. Both side surfaces of the rib portion 23 in the short direction of the main body 10 are disposed along the side surface portion 11 b of the first plate-like member 11, and are adhesively bonded to the side surface portion 11 b by a foamable adhesive 27.

  As a result, the ribs 22 arranged in a lattice shape are directed from the flat plate portion 21 of the reinforcing member 20 toward the flat surface portion 12a of the second plate member 12 in the frame main body 10 as shown in FIG. The rib 22 has a tip portion that is shorter than an intermediate position between the bottom surface portion 11a of the first plate member 11 and the flat portion 12a of the second plate member 12. Has been. In addition, it is preferable that the rib 22 is arrange | positioned from the neutral axis L1 when a bending load is input into the bottom face part 11a of the 1st plate-shaped member 11 of the frame main body 10 from the outside on the side which a compressive stress produces.

  In the vehicle body frame 1, the lattice-like ribs 22 are formed with an opening 24 formed by the ribs 22 in a quadrangular shape as shown in FIG. However, the openings 24 formed by the ribs 22 can be formed in other shapes such as a triangular shape, a hexagonal shape, or an octagonal shape.

  The vehicle body frame 1 configured in this manner is arranged so that the bottom surface portion 11a of the first plate-like member 11 faces in a direction in which a bending load is assumed to be input. Thereby, when a bending load is input from the outside, a force in the compression direction acts on the bottom surface portion 11 a of the first plate member 11 to generate a compressive stress, and the flat portion of the second plate member 12. A force in the tensile direction acts on 12a to generate a tensile stress.

  As described above, in the vehicle frame structure according to the first embodiment of the present invention, the resin reinforcing member 20 is disposed in the longitudinal direction of the frame body 10 inside the frame body 10 formed in a metal closed cross section. The frame main body 10 is attached to the bottom surface portion 11a of the first plate-like member 11 to which a force in the compression direction is applied and a force in the tension direction is applied when a bending load is input from the outside. The flat plate portion 12a of the second plate member 12 and the side surface portion 11b of the first plate member 11 between the bottom surface portion 11a and the flat plate portion 12a, and the reinforcing member 20 is the first plate. A flat plate portion 21 disposed along the bottom surface portion 11 a of the plate-like member 11 and adhesively bonded to the bottom surface portion 11 a, and a lattice shape extending from the flat plate portion 21 toward the flat plate portion 12 a of the second plate-like member 12. And a rib portion 23 composed of a rib 22 disposed on the .

  Thereby, when a bending load is input from the outside, the flat plate portion 21 of the reinforcing member 20 that is adhesively bonded to the bottom surface portion 11a of the first plate-like member 11 on which a force in the compression direction acts acts directly on the bottom surface portion 11a. Since the rigidity can be increased and the bending deformation of the bottom surface portion 11a can be suppressed, and the bottom surface portion 11a can be made strong against compression by the ribs 22 extending from the flat plate portion 21 and arranged in a lattice shape. The bending deformation of the bottom surface portion 11a of the first plate-like member 11 that can occur at the initial stage of the bending deformation of the frame 10 can be effectively suppressed, and the bending drag can be efficiently performed while reducing the weight. Can be secured.

  When manufacturing the vehicle body frame 1 to which the vehicle frame structure is applied, first, the first plate member 11 formed in a hat shape in cross section is welded to the second plate member 12 to form the first plate shape. The reinforcing member 20 is applied to the inside of the frame main body 10 composed of the member 11 and the second plate-like member 12 in a state where the foamable adhesive 27 is applied to the flat plate portion 21 and both side surfaces of the rib portion 23 of the reinforcing member 20. Insert and hold in place as shown in FIG. The foamable adhesive 27 is foamed at the time of baking in the electrodeposition coating process, and the reinforcing member 20 is adhesively bonded to the frame body 10 by the foamable adhesive 27 to manufacture. Thereby, in an electrodeposition coating process, an electrodeposition liquid can enter the inside of the frame main body 10, and the effect of improving corrosion resistance can be acquired.

  FIG. 3 is a view showing a vehicle body frame to which a vehicle frame structure according to the second embodiment of the present invention is applied, and FIG. 3A is a vehicle frame structure according to the second embodiment of the present invention. FIG. 3B is a cross-sectional view of the vehicle body frame taken along line Y3b-Y3b in FIG. In addition, in 2nd Embodiment, the same code | symbol is attached | subjected about what has the structure similar to 1st Embodiment, and performs the same effect | action, and abbreviate | omits description.

  As shown in FIG. 3, the vehicle body frame 31 to which the vehicle frame structure according to the second embodiment of the present invention is applied is similar to the vehicle body frame 1 in that the frame body 10 is formed in a metal closed cross section. A resin-made reinforcing member 40 is disposed therein, and the reinforcing member 40 is disposed along the bottom surface portion 11a of the first plate-like member 11 and is bonded to the bottom surface portion 11a. 41 having a rib portion 43 formed of ribs 42 extending in a grid pattern extending from 41 to the flat surface portion 12a of the second plate-like member 12, and a rectangular opening formed by the ribs 42 arranged in a grid pattern. Although the portion 44 is formed, the rib 42 is formed so as to extend to the flat surface portion 12a of the second plate-like member 12 and contact the flat surface portion 12a.

  Also in the vehicle frame structure configured as described above, when a bending load is input from the outside to the bottom surface portion 11 a of the first plate-like member 11 of the frame body 10, it can occur at the initial stage of bending deformation of the frame body 10. Bending deformation of the bottom surface portion 11a of the first plate-like member 11 toward the inner side of the frame main body 10 can be effectively suppressed, and bending resistance can be efficiently ensured while achieving weight reduction.

  Further, in the vehicle body frame 31, the rib 42 extends from the flat plate portion 41 to the flat surface portion 12 a of the second plate-like member 12, whereby the first plate-like member 11 toward the inward side of the frame body 10. The bending deformation of the bottom surface portion 11a can be suppressed, and the bending deformation of the flat surface portion 12a of the second plate-like member 12 toward the inner side of the frame body 10 can be suppressed, and the above-described effect is more effectively achieved. be able to.

  FIG. 4 is a perspective view showing a main part of a vehicle body frame to which a vehicle frame structure according to a third embodiment of the present invention is applied. 5 is a cross-sectional view of the vehicle body frame along the lines Y5a-Y5a and Y5b-Y5b in FIG. 4, and FIG. 5A is a cross-sectional view of the vehicle body frame along the line Y5a-Y5a. FIG. 5B is a cross-sectional view of the vehicle body frame along the line Y5b-Y5b. FIGS. 4 and 5B show only a part of the vehicle body frame in the longitudinal direction. In addition, in 3rd Embodiment, the same code | symbol is attached | subjected about what has the structure similar to 2nd Embodiment, and performs the same effect | action, and abbreviate | omits description.

  As shown in FIGS. 4 and 5, a vehicle body frame 51 to which the vehicle frame structure according to the third embodiment of the present invention is applied is a frame formed in a metal closed cross section like the vehicle body frame 31. A resin reinforcing member 60 is disposed inside the main body 10, and the reinforcing member 60 is disposed along the bottom surface portion 11 a of the first plate-like member 11, and a flat plate portion 61 that is adhesively bonded to the bottom surface portion 11 a. The rib portion 63 is formed of a rib 62 extending from the flat plate portion 61 toward the flat surface portion 12a of the second plate-like member 12 and arranged in a lattice shape. 62 extends to the flat surface portion 12 a of the second plate-like member 12, and is arranged in a grid pattern, the bottom surface portion 11 a of the first plate-like member 11, and the flat surface of the second plate-like member 12. A second rib 62b extending to a substantially intermediate position between the portion 12a and That.

  As shown in FIG. 5, in the reinforcing member 60 of the vehicle body frame 51, a rectangular opening 64 a is formed by the first ribs 62 a of the ribs 62 arranged in a lattice shape, like the ribs 42 of the reinforcing member 40. However, the second rib 62b is arranged in a cross shape in the opening 64a so as to divide the opening 64a formed by the first rib 62a into four rectangular openings 64b.

  As described above, in the vehicle body frame 51, the ribs 62 formed in a lattice shape in the rib portion 63 of the reinforcing member 60 have the openings 64a formed by the first ribs 62a on the flat plate portion 61 side by the second ribs 62b. The size of the opening 64 is reduced as the flat plate portion 61 is divided, and the rib portion 63 is configured to increase in strength as it approaches the bottom surface portion 61.

  Also in the vehicle frame structure configured as described above, when a bending load is input from the outside to the bottom surface portion 11 a of the first plate-like member 11 of the frame body 10, it can occur at the initial stage of bending deformation of the frame body 10. Bending deformation of the bottom surface portion 11a of the first plate-like member 11 toward the inner side of the frame main body 10 can be effectively suppressed, and bending resistance can be efficiently ensured while achieving weight reduction. Further, in the vehicle body frame 51, the rib portion 63 is configured to increase in strength as it approaches the flat plate portion 61, thereby increasing the effect of suppressing the bending deformation of the bottom surface portion 11 a of the first plate member 11. be able to.

  In the vehicle body frame 51 according to the third embodiment, the ribs 62 arranged in a lattice shape are formed such that the size of the opening 64 decreases as the plate portion 61 is approached, and the rib portion 63 is formed on the flat plate portion 61. The ribs 63 are made closer to the flat plate portion 61 by increasing the thickness of the ribs as they approach the flat plate portion 61 in the ribs 62 arranged in a lattice pattern. It is also possible to configure so that the strength increases with time.

  FIG. 6 is a perspective view showing a vehicle body frame to which a vehicle frame structure according to the fourth embodiment of the present invention is applied. In addition, in 4th Embodiment, the same structure as the case in 2nd Embodiment is provided, and the same code | symbol is attached | subjected about what performs the same effect | action, and description is abbreviate | omitted.

  As shown in FIG. 6, a vehicle body frame 71 to which the vehicle frame structure according to the fourth embodiment of the present invention is applied is similar to the vehicle body frame 31 in that the frame main body 10 is formed in a metal closed cross section. A resin-made reinforcing member 80 is disposed therein, and the reinforcing member 80 is disposed along the bottom surface portion 11a of the first plate-like member 11 and adhesively bonded to the bottom surface portion 11a, and a flat plate portion. A rib portion 83 formed of ribs 82 extending from 81 to the flat surface portion 12a of the second plate-like member 12 and arranged in a grid pattern. The size is formed so as to decrease from the longitudinal end portion side of the frame body 10 toward the longitudinal center side of the frame body 10.

  As shown in FIG. 6, in the reinforcing member 80 of the vehicle body frame 71, the opening 84 formed by the rib 82 has openings 84 a, 84 b, 84 c as it approaches the central side from the longitudinal end of the frame body 10. The sizes of the openings are formed in the order of. Thus, in the vehicle body frame 71, the size of the opening 84 formed by the lattice-shaped ribs 82 is formed so as to decrease from the longitudinal end of the frame body 10 toward the center thereof, and the rib 83 Is configured such that the strength increases as it approaches the center side from the longitudinal end of the frame body 10.

  Also in the vehicle frame structure configured as described above, when a bending load is input from the outside to the bottom surface portion 11 a of the first plate-like member 11 of the frame body 10, it can occur at the initial stage of bending deformation of the frame body 10. Bending deformation of the bottom surface portion 11a of the first plate-like member 11 toward the inner side of the frame main body 10 can be effectively suppressed, and bending resistance can be efficiently ensured while achieving weight reduction.

  Further, in the vehicle body frame 71, the rib portion 83 is configured to increase in strength as it approaches the longitudinal direction central side of the frame body 10 from the longitudinal direction end portion side of the frame body 10, whereby the frame body 10 is The effect of suppressing the bending deformation of the bottom surface portion 11a of the first plate-like member 10 can be enhanced on the center side in the longitudinal direction of the frame main body 10 where bending deformation is likely to occur.

  In the vehicle body frame 71 according to the fourth embodiment, the ribs 82 arranged in a lattice shape are formed such that the size of the opening 84 decreases as the distance from the longitudinal end of the frame main body 10 approaches the center. The rib portion 83 is configured to increase in strength as it approaches the center side from the longitudinal end portion side of the frame main body 10, but the rib 82 arranged in a lattice shape has a longitudinal length of the frame main body 10. By increasing the thickness of the rib as it approaches the central side from the direction end, the rib 83 is configured to increase in strength as it approaches the center from the longitudinal end of the frame body 10. It is also possible.

  FIG. 7 is a perspective view showing a vehicle body frame to which a vehicle frame structure according to the fifth embodiment of the present invention is applied. FIG. 8 is a view of the vehicle body frame taken along the lines Y8a-Y8a and Y8b-Y8b in FIG. FIG. 8A is a cross-sectional view of the vehicle body frame along the line Y8a-Y8a, and FIG. 8B is a cross-sectional view of the vehicle body frame along the line Y8b-Y8b. Note that the fifth embodiment has the same configuration as that of the first embodiment and performs the same function, and a description thereof will be omitted.

  As shown in FIGS. 7 and 8, a vehicle body frame 91 to which a vehicle frame structure according to a fifth embodiment of the present invention is applied is similar to the vehicle body frame 1 and is formed in a metal closed cross section. A resin reinforcing member 100 is disposed inside the frame 91, and the reinforcing member 100 is disposed along the bottom surface portion 11a of the first plate-like member 11 and is bonded to the bottom surface portion 11a by a flat plate portion 101. And a rib portion 103 composed of ribs 102 arranged in a grid pattern extending from the flat plate portion 101 toward the flat surface portion 12a of the second plate-like member 12, and a rectangular opening 104 is formed by the rib 102. However, the ribs 102 are formed such that the height of the ribs decreases from the lateral direction end portion side of the frame body 10 toward the lateral direction center side of the frame body 10. The rib 102 is preferably arranged on the side where the compressive stress is generated from the neutral axis L1 when a bending load is input to the bottom surface portion 11a of the first plate-like member 11 of the frame body 10 from the outside.

  As shown in FIG. 8A, in the reinforcing member 100 of the vehicle body frame 91, the rib 102 has a tip portion at the bottom end portion 11 a of the first plate-like member 11 on the short side end portion side of the frame body 10. Is formed shorter than a substantially intermediate position between the flat plate portion 12a of the second plate member 12 and lower toward the center in the short direction of the frame body 10, and the short direction of the frame body 10 is formed. Are curved in a concave shape.

  Also in the vehicle frame structure configured as described above, when a bending load is input from the outside to the bottom surface portion 11 a of the first plate-like member 11 of the frame body 10, it can occur at the initial stage of bending deformation of the frame body 10. Bending deformation of the bottom surface portion 11a of the first plate-like member 11 toward the inner side of the frame main body 10 can be effectively suppressed, and bending resistance can be efficiently ensured while achieving weight reduction.

  In the vehicle body frame 91 according to the fifth embodiment, the front end portion of the rib 102 has the bottom surface portion 11 a of the first plate-like member 11 and the second plate-like member 12 on the short-side end side of the frame body 10. Although it is shorter than the substantially middle position between the flat plate portion 12a and the flat plate portion 12a, the flat plate portion 12a can be formed so as to extend to the flat plate portion 12a.

  In the vehicle body frame to which the above-described vehicle frame structure according to the embodiment of the present invention is applied, the reinforcing members 20, 40, 60, 80, 100 arranged inside the frame body 10 are in the short direction of the frame body 10. Since both side surfaces of the rib portions 23, 43, 63, 83, and 103 are adhesively bonded to the side surface portion 11b of the first plate-like member 11, the first plate is applied when a bending load is input from the outside. It is possible to prevent the side surface portion 11b of the first plate-like member 11 from bulging outward and deforming out of the plane as the bottom surface portion 11a of the plate-like member 11 is deformed inward of the frame body 10. It is possible to further suppress the bottom surface portion 11 a of the first plate-like member 11 from being deformed inward of the frame body 10.

  Note that the bottom surface portion 11a of the first plate member 11 to which a force in the compression direction acts when a bending load is input to the body frames 1, 31, 51, 71, 91 from the outside is described in the claims of this application. The flat surface portion 12a of the second plate-like member 12 to which the force in the tensile direction acts corresponds to the second surface portion described in the claims of the present application, and the bottom surface portion 11a and the flat surface portion 12a. The side surface portion 11b of the first plate-like member 11 between and corresponds to a third surface portion between the first surface portion and the second surface portion described in the claims of the present application.

  The present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention. For example, the vehicle frame structure according to the fifth embodiment described above and the vehicle frame structure according to the fifth embodiment are combined, and the vehicle body frame 91 according to the fifth embodiment is applied with a grid pattern. The vehicle frame structure according to the first to fifth embodiments is such that the opening 104 formed by the rib 102 disposed on the frame 102 is reduced from the longitudinal end of the frame body 10 toward the center thereof. You may make it comprise combining each suitably.

  The present invention relates to a vehicle frame structure in which a resin reinforcing member is attached inside a metal closed cross-section member, and a vehicle frame structure capable of efficiently ensuring a bending resistance while reducing the weight. For example, there is a possibility of being widely used for a vehicle body frame constituting a part of a vehicle body such as a side pillar or a side sill.

1, 31, 51, 71, 91 Body frame 10 Frame body 11 First plate member 11a Bottom surface portion (first surface portion) of first plate member
11b Side surface portion (third surface portion) of first plate-like member
12 2nd plate-shaped member 12a Flat surface part (2nd surface part) of 2nd plate-shaped member
20, 40, 60, 80, 100 Reinforcement member 21, 41, 61, 81, 101 Reinforcement member flat plate portion 22, 42, 62, 82, 102 Reinforcement member rib 23, 43, 63, 83, 103 Reinforcement member Ribs 24, 44, 64, 84, 104 Openings formed by the ribs

Claims (5)

A vehicle frame structure in which a resin reinforcing member is attached along the longitudinal direction of the closed cross-section member inside the metal closed cross-section member,
The closed cross-section member includes a first surface portion on which a force in a compressive direction acts, a second surface portion on which a force in a tensile direction acts, a first surface portion, and a second surface portion when a bending load is input from the outside. And a third surface portion between
The reinforcing member includes a flat plate portion disposed along the first surface portion and adhesively bonded to the first surface portion, and ribs disposed in a lattice shape extending from the flat plate portion toward the second surface portion. and the rib portion made, the possess,
The rib is formed so that the height of the rib becomes lower from the end side of the closed cross-section member toward the center side of the closed cross-section member in a direction crossing the closed cross-section member.
A vehicle frame structure characterized by that. The rib portion is configured to increase in strength as it approaches the flat plate portion,
The vehicle frame structure according to claim 1. The size of the opening formed by the lattice-shaped ribs is formed smaller as the flat plate portion is approached, or the rib is formed thicker as the thickness of the rib approaches the flat plate portion,
The vehicle frame structure according to claim 2. The rib portion is configured such that the strength increases as it approaches the longitudinal direction center side of the closed cross-section member from the longitudinal end portion side of the closed cross-section member.
The vehicle frame structure according to claim 1, wherein the vehicle frame structure is a vehicle frame structure. The size of the opening formed by the lattice-shaped ribs is formed so as to decrease from the longitudinal end portion side of the closed cross-section member to the longitudinal center side of the closed cross-section member, or the thickness of the rib Is formed thicker from the end in the longitudinal direction of the closed cross-section member toward the center in the longitudinal direction of the closed cross-section member.
The vehicle frame structure according to claim 4.