JP2011178327A - Frame structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a frame structure for a vehicle, which restrains out-of-plane deformation of a frame body and eliminates a starting point of the out-of-plane deformation of the frame body, to enhance bending drag of the frame body. <P>SOLUTION: In this frame structure for the vehicle, the frame body 10 has a first surface part, a second surface part, and a third surface part for forming a corner part between the first surface part and the second surface part. A reinforcing member 20 has a base part 21 extending while separating from the third surface part, and a plurality of projection parts 22 projecting toward the third surface part from the base part and having at least part joined to the third surface part. The plurality of projection parts are arranged so that a groove part 25 formed between the adjacent projection parts and itself is formed in a mesh-shape by inclining at a predetermined angle to the longitudinal direction of the frame body, and an adhesive is filled in a mesh-shape space part 26 formed between the frame body and the reinforcing member by the groove part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a structure of a vehicle frame that constitutes a part of a vehicle body in a vehicle such as an automobile. More specifically, the present invention relates to the inside of a tubular frame body to which a load can act from the outside, in the longitudinal direction of the frame body. The present invention relates to a vehicle frame structure to which a reinforcing member is attached.

  As is well known, a vehicle frame (body frame) such as a center pillar or side sill that constitutes a part of a vehicle body of a vehicle such as an automobile is required to have high strength and high rigidity and to improve fuel efficiency. There is a need for weight reduction. For this reason, the body frame is often configured by forming a metal plate-like material into a tubular shape.

  Also known as a body frame is a tubular frame body in which a reinforcing member is attached along the longitudinal direction of the frame body. For example, in Patent Document 1, a reinforcing member that forms a plurality of closed cross sections extending in the longitudinal direction of the side sill with the inner panel is provided inside the side sill, so that the bending rigidity of the side sill is increased by the closed cross section. What has been disclosed is disclosed.

JP 2009-1113768 A

  In recent years, in vehicles such as automobiles, in order to ensure the safety of passengers in the event of a collision from the side of the vehicle body, for example, a so-called side collision, the vehicle body frame such as a center pillar or a side sill is Therefore, it is required to further increase the bending resistance of the vehicle body frame so that it does not bend and deform even when a load is applied.

  The inventors of the present application have conducted various test studies, and will be described in detail later. When a load is applied to the tubular frame body having a rectangular cross section due to an external load and bending deformation, the compression direction is applied when the load is applied. The first surface portion on which the force acts starts to deform inward of the frame body along the load input direction, and the surface portion adjacent to the first surface portion swells outward of the frame body along with this deformation. It has been found that out-of-plane deformation occurs, the second surface portion on which a tensile force acts when a load is applied is deformed inward of the frame body, and the frame body is bent and deformed to buckle.

  According to such knowledge, in the frame main body to which a load can be applied from the outside, the out-of-plane deformation of the surface portion adjacent to the first surface portion that is deformed with the bending deformation of the first surface portion toward the inner side of the frame main body is suppressed. If it is possible, the bending deformation of the entire frame body can be effectively suppressed, and the bending resistance of the frame body can be increased.

  In that case, a plurality of closed cross sections extending in the longitudinal direction of the frame body as disclosed in Patent Document 1 are formed on a surface portion adjacent to the first surface portion of the frame body to which a load can act from the outside. It is conceivable to attach a reinforcing member to the. In such a case, although the rigidity of the entire frame body can be increased by the reinforcing member and the bending resistance can be increased, the closed cross section extending in the longitudinal direction of the frame body when a load acts on the first surface portion of the frame body from the outside. The part is not very useful for the out-of-plane deformation of the surface part adjacent to the first surface part of the frame body, and the surface part adjacent to the first surface part of the frame body and the closed cross-section part both bulge outward from the frame body and are deformed out of plane. There is a drown that produces.

  On the other hand, it is conceivable that the reinforcing member is attached inside the frame body so as to form a plurality of closed cross sections extending in a direction inclined by a predetermined angle with respect to the longitudinal direction of the frame body. In this case, since the reinforcing member is attached so that the closed cross-section portion extends in a direction inclined by a predetermined angle with respect to the longitudinal direction of the frame body, the reinforcing member so that the closed cross-section portion extends in the longitudinal direction of the frame body. Compared with the case where the is attached, it is possible to suppress the surface portion adjacent to the first surface portion of the frame body from being deformed out of plane.

  However, the out-of-plane deformation of the surface portion adjacent to the first surface portion of the frame body bulges outward in a part of the longitudinal direction of the frame body, and both longitudinal end portions of the frame body bulge outward Since there is an origin of out-of-plane deformation, a plurality of closed cross-section portions extending in a direction inclined by a predetermined angle with respect to the longitudinal direction of the frame body are formed on the surface portion adjacent to the first surface portion of the frame body. When the reinforcing member is attached, the frame main body may be deformed out of plane starting from a closed cross-sectional portion where the reinforcing member is separated from the surface portion adjacent to the first surface portion of the frame main body.

  Therefore, the present invention has been made in view of the above technical problem, and can suppress the out-of-plane deformation of the frame main body, eliminate the starting point of the out-of-plane deformation of the frame main body, and increase the bending resistance of the frame main body. An object of the present invention is to provide a vehicle body frame structure that can be used.

  For this reason, the vehicle body frame structure according to claim 1 of the present application has a vehicle frame structure in which a reinforcing member is attached along the longitudinal direction of the frame body inside a tubular frame body to which a load can act from the outside. The frame body includes a first surface portion on which a force in the compression direction acts when a load is applied from the outside, a second surface portion on which a force in the tensile direction acts, and the first surface portion and the second surface portion. A third surface portion that forms a corner portion between the first surface portion and the second surface portion, and the reinforcing member is spaced apart from the third surface portion. A base portion extending along the surface portion, and a plurality of convex portions protruding from the base portion toward the third surface portion and abutting against the third surface portion, at least a part of which is coupled to the third surface portion And an area including a corner between the first surface portion and the third surface portion of the frame body. The plurality of protrusions are provided such that a groove formed between adjacent protrusions is formed in a mesh shape inclined at a predetermined angle with respect to the longitudinal direction of the frame body, The network space formed between the frame main body and the reinforcing member is filled with an adhesive that bonds the frame main body and the reinforcing member.

  The invention according to claim 2 of the present application is the invention according to claim 1, wherein the adhesive is a thermosetting adhesive that foams when heated to a predetermined temperature, and is formed into a sheet having a predetermined thickness. The reinforcing member is overlapped and attached to the frame main body side of the reinforcing member in a state where an opening is formed corresponding to the convex portion coupled to the third surface portion of the frame main body.

  Further, the invention according to claim 3 of the present application is the invention according to claim 2, wherein the adhesive is attached to the frame body side of the reinforcing member so as to overlap the groove before foaming of the adhesive. Correspondingly, a mesh-like void portion continuous in the longitudinal direction of the frame body is formed between the adhesive and the frame body.

  Still further, the invention according to claim 4 of the present application is the invention according to claim 2 or claim 3, wherein the protrusions other than the protrusions combined with the third surface part of the reinforcing member are connected to the third surface part. The height of the convex portion is lower than the convex portion to be formed, and is in contact with the third surface portion via the adhesive, and is bonded to the third surface portion by the adhesive.

  According to the vehicle body frame structure according to claim 1 of the present application, the frame body is formed on the outer side by the mesh-shaped space portion formed between the frame body and the reinforcing member and inclined at a predetermined angle with respect to the longitudinal direction of the frame body. And the deformation corresponding to the space between the frame main body and the reinforcing member is constrained by the frame main body through the adhesive. The origin of out-of-plane deformation can be eliminated and the bending resistance of the frame body can be increased.

  Further, according to the invention according to claim 2 of the present application, the adhesive is formed in a sheet shape having a predetermined thickness, and an opening is formed corresponding to the convex portion coupled to the third surface portion of the frame body. In this state, it is possible to attach the adhesive to the reinforcing member relatively easily without having to apply the adhesive to the reinforcing member, and through the opening. The convex portion and the frame main body can be coupled, and the reinforcing member can be accurately arranged at a predetermined position. In addition, since the adhesive is a thermosetting adhesive that foams when heated to a predetermined temperature, the adhesive is foamed between the bonded reinforcing member and the frame body in the heat drying step, and the frame body The reinforcing member can be securely bonded.

  Furthermore, according to the invention according to claim 3 of the present application, the adhesive is attached to the frame body side of the reinforcing member so as to overlap before foaming, and the frame is disposed between the adhesive and the frame body corresponding to the groove portion. By forming a mesh-like void that is continuous in the longitudinal direction of the main body, when the electrodeposition coating process is performed after the frame main body and some convex portions of the reinforcing member are combined, It is possible to enter between the main body and the reinforcing member, and it is possible to improve the corrosion resistance.

  Furthermore, according to the invention according to claim 4 of the present application, the height of the convex portion excluding the convex portion combined with the third surface portion of the reinforcing member is higher than that of the convex portion combined with the third surface portion. It is formed low, abuts against the third surface portion via an adhesive, and is bonded to the third surface portion with an adhesive, so that the bonding force between the reinforcing member and the frame body can be increased, and the above effect is more effective. Can be played.

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. It is sectional drawing of the vehicle body frame which followed the Y2A-Y2A line | wire and Y2B-Y2B line | wire in FIG. FIG. 3 is a cross-sectional view of the vehicle body frame taken along line Y3-Y3 in FIG. It is explanatory drawing for demonstrating the convex part of a reinforcement member. It is sectional drawing of the vehicle body frame before the adhesive agent attached to the reinforcement member foams. It is explanatory drawing for demonstrating the structure comprised by the frame main body and the reinforcement member. It is a graph which shows the measurement result of the bending load with respect to the downward stroke of the indenter which loads a vehicle body frame. It is a perspective view 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 sectional drawing of the vehicle body frame along the Y9-Y9 line in FIG. It is explanatory drawing for demonstrating the simulation for analyzing the bending deformation behavior of a vehicle body frame. It is a perspective view which shows the result of having analyzed the bending deformation behavior of the vehicle body frame by simulation. FIG. 12 is a cross-sectional view showing a cross section of a bent portion of the vehicle body frame in FIG. 11. It is a graph which shows the relationship between the downward stroke of the indenter which loads 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.

  Embodiments of the present invention will be described below 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 provide a vehicle frame structure in which a reinforcing member is attached to the inside of the tubular frame body along the longitudinal direction of the frame body. In the development, first, a simulation analysis by CAE (Computer Aided Engineering) was performed on the deformation behavior when the bending force is applied to the tubular body frame from the outside.

FIG. 10 is an explanatory diagram for explaining a simulation for analyzing the bending deformation behavior of the tubular body frame. FIG. 10A shows a model used for analyzing the bending deformation behavior of the body frame. FIG. 10B is a diagram illustrating a state where a load is applied to the vehicle body frame and the vehicle body frame is bent, and FIG. 11 is a perspective view illustrating a result of simulation analysis of the bending deformation behavior of the vehicle body frame. FIG. 12 is a cross-sectional view showing a cross section of a bent portion of the body frame in FIG. 11. In FIG. 11, 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. 11 and 12 show the progress of bending deformation of the body frame in the order of (a), (b), (c), and (d), and the descending stroke of the indenter 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. 11 and 12, as a tubular body frame, an upper surface portion 200a, a lower surface portion 200b provided in parallel with the upper surface portion 200a in a state of being separated from the upper surface portion 200a, and an upper surface portion 200a The side portions 200c on both sides adjacent to the lower surface portion 200b and located between the upper surface portion 200a and the lower surface portion 200b, that is, the right end portion of the upper surface portion 200a and the right end portion of the lower surface portion 200b in FIGS. A tubular frame body 200 having a right side surface portion 200c positioned between them and a left side surface portion 200c positioned between a left end portion of the upper surface portion 200a and a left end portion of the lower surface portion 200b, and having a substantially rectangular closed cross section. As a model, a bending load is applied to this body frame from outside to simulate the deformation behavior when the body frame is bent and deformed It was analyzed.

  Specifically, as shown in FIG. 10 (a), a frame main body 200 having a predetermined length X1 is supported by two fixing points 201 separated by a predetermined distance X2 shorter than the length X1. The indenter 202 is lowered at a constant speed from above to the central portion P1 in the longitudinal direction of the upper surface portion 200a of the frame body 200 corresponding to the intermediate position of the fixed point 201, and is acted from the outside via the indenter 202 at the time of a side collision of the vehicle. A load F simulating the load to be applied was applied to the frame body 200, and the bending deformation behavior of the body frame was examined.

  When the load F is applied to the vehicle body frame from the outside in this way, as shown in FIG. 10B, the frame main body 200 is bent and deformed downward, and the frame main body 200 has an upper surface portion. In 200a, a compressive stress is applied 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. 13 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 frame main body 200 from the position in contact with the upper surface portion 200a of the frame main body 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 frame body 200 is bent and deformed, and is represented by the product of the reaction force F ′ with respect to the load F and the downward stroke of the indenter 202.

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

As shown in (a) of FIG. 11 and FIG. 12, the indenter 202 is lowered from above the frame body 200, when downward stroke of the indenter indenter 202 is positioned in contact with the upper surface portion 200a is _{S 0,} the frame body 200, the vertex P2 of the corner portion 200d formed between the upper surface portion 200a and the side surface portion 200c is substantially above the vertex P3 of the corner portion 200e formed between the lower surface portion 200b and the side surface portion 200c. Located on the side. Note that these vertices P2 and P3 represent the vertices of the corners 200d and 200e in the cross section having the center portion P1 when the frame body 200 is bent and deformed.

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

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. 11 and FIG. 12, the frame body 200 is curved in a convex shape on the lower side And is deformed inwardly of the tubular frame body 200, and along with this deformation, the side surface portion 200c adjacent to the upper surface portion 200a swells outward in the cross-sectional direction to cause out-of-plane deformation. The vertex P2 of the corner portion 200d is inclined outward from the substantially vertical direction with respect to the vertex P3 of 200e, and a portion having a large deformation amount is generated in the corner portion 200d as indicated by a deformation portion α in FIG. Further, as shown in FIG. 12B, the lower surface portion 200 b is displaced inward of the frame main body 200 with this deformation.

  The out-of-plane deformation of the side surface portion 200c adjacent to the upper surface portion 200a of the frame main body 200 is outward only in a part of the frame main body 200 in the longitudinal direction, specifically, only in the central portion of the frame main body 200 in the longitudinal direction. The origin of out-of-plane deformation (becomes a trough) where the side surface portion 200c is bent and deformed at both ends in the longitudinal direction of the frame body 200 at the portion of the frame body 200 that bulges and bulges outward. Part) exists.

  When the descending stroke of the indenter 202 is further increased, as shown in FIG. 13, 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. 11 and 12 (c) and (d). As shown, the frame body 200 is further bent and deformed, the upper surface portion 200a is further deformed inwardly of the frame body 200, and along with this deformation, the side surface portion 200c is orthogonal to the longitudinal direction of the frame body 200. Further, the lower surface portion 200d is further displaced toward the inner side of the frame body 200, and the frame body 200 is bent and deformed and buckled.

  From this simulation analysis result, the inventors of the present application have found that when a load is applied to the tubular frame body having a rectangular cross section from the outside to bend and deform, a first surface portion (upper surface portion) on which a force in the compression direction acts when the load is applied. ) Begins to deform toward the inward side of the frame body along the input direction of the load, and along with this deformation, the surface portion (side surface portion) adjacent to the first surface portion swells outward from the frame body and deforms out of plane. It was found that the second surface portion (lower surface portion) on which a force in the tensile direction acts when a load is applied is deformed inward of the frame body, and the frame body is bent and deformed to buckle.

  In addition to the above-described simulation analysis, the inventors of the present application also applied to the actual vehicle body frame formed into a rectangular cross-section tube in the same manner as the deformation behavior when the vehicle body frame is bent and deformed by applying a load from the outside. An experiment was conducted, and in this experiment as well, a result almost similar to the simulation analysis result described above was obtained. In addition, as described later, the inventors of the present application conducted experiments for preparing the actual vehicle body frames and examining the deformation behavior in the same manner for the vehicle body frames of Comparative Example 1, Comparative Example 2, and Example.

  Therefore, on the basis of these simulation analysis results and experimental results, the frame main body to which a load can be applied from the outside is adjacent to the first surface portion that is deformed in accordance with the bending deformation of the first surface portion toward the inner side of the frame main body. If the out-of-plane deformation of the surface portion can be suppressed, the bending deformation of the entire frame body can be effectively suppressed, and the bending resistance of the frame body can be increased.

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. FIG. 2 is a view of the vehicle body frame taken along lines Y2A-Y2A and Y2B-Y2B in FIG. FIG. 3 is a cross-sectional view of the vehicle body frame taken along line Y3-Y3 in FIG. In FIG. 1 and FIG. 8 to be described later, in order to clearly show the reinforcing member in the frame main body, the adhesive for bonding the frame main body and the reinforcing member is omitted and the frame main body is indicated by a one-dot chain line, which is in a transparent state. Is shown.

  As shown in FIGS. 1 to 3, a vehicle body frame 1 to which the vehicle frame structure according to the first embodiment of the present invention is applied includes a tubular frame body 10 having a substantially rectangular cross section, and a longitudinal direction of the frame body 10. And a reinforcing member 20 for reinforcing the frame body 10 attached to the inside of the frame 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. The first plate-like member 11 includes a bottom surface portion 11a formed in a substantially planar shape, a side surface portion 11b extending from the bottom surface portion 11a in a substantially vertical direction on both sides of the bottom surface portion 11a, and a side surface portion. 11b, and a flange portion 11c extending outward in a substantially right angle direction, and the second plate member 12 includes a flat portion 12a formed in a substantially flat shape.

  In the frame main body 10, the first plate-like member 11 and the second plate-like member 12 overlap the flange portion 11 c of the first plate-like member 11 with the flat portion 12 a of the second plate-like member 12. They are joined by spot welding to form a substantially rectangular closed cross section. Thereby, in the frame main body 10, a corner portion 10 a that is substantially perpendicular to the bottom surface portion 11 a and the side surface portion 11 b of the first plate member 11 is formed, and the side surface portion 11 b of the first plate member 11 is A corner portion 10 b that is substantially perpendicular to the flat portion 12 a of the second plate member 12 is formed.

  The reinforcing member 20 attached to the inside of the frame main body 10 is also obtained by pressing a metal plate-like material such as a steel plate, and the first main body of the frame main body 10 along the longitudinal direction of the frame main body 10 is obtained. The plate-like member 11 is attached to the side portions 11b on both sides of the plate-like member 11, and is disposed so as to cover the inner peripheral side of the frame body 10 in a region including the corner portion 10a of the frame body 10. Note that a galvanized steel sheet or the like can be used as the reinforcing member 20.

  Each reinforcing member 20 is formed integrally with the base portion 21 and a base portion 21 extending along the side surface portion 11b while being separated from the side surface portion 11b of the first plate-like member 11 of the frame body 10 by a predetermined distance. It has the some convex part 22 which protrudes toward the side part 11b from the base 21, and is formed in square frustum shape.

  FIG. 4 is an explanatory diagram for explaining a convex portion of the reinforcing member, and is a front view showing a main part of the reinforcing member. As shown in FIG. 4, the plurality of convex portions 22 are formed in a quadrangular pyramid shape in which the top surface portion 22 a is a quadrangle, and have a period in the longitudinal direction of the frame body 10 and the direction orthogonal to the longitudinal direction (orthogonal cross-sectional direction). Are arranged.

  Each of the plurality of convex portions 22 is arranged such that the square diagonal line of the top surface portion 22a is parallel to the longitudinal direction and the orthogonal cross-sectional direction of the frame main body 10, and the convex portions 22 adjacent in the longitudinal direction of the frame main body 10 are mutually framed. The main body 10 has an overlap L1 in the orthogonal cross-sectional direction, and the protrusions 22 adjacent to each other in the orthogonal cross-sectional direction of the frame main body 10 have an overlap L2 in the longitudinal direction of the frame main body 10.

  The plurality of convex portions 22 are also formed in such a manner that the groove portion 25 formed by the base portion 21 and the side surface portion 22b of the convex portion 22 between the adjacent convex portions 22 has a predetermined angle with respect to the longitudinal direction of the frame body 10. In the form, it is provided so as to be inclined and formed in a mesh shape. That is, the plurality of convex portions 22 are provided so that the groove portions 25 that are linearly continuous in the longitudinal direction and the orthogonal cross-sectional direction of the frame body 10 are not formed.

  In the present embodiment, a part of the convex portions 22 at the positions indicated by the black circles (●) marked with the symbol SW in FIG. 1 abuts on the side surface portion 11 b of the first plate-like member 11 of the frame body 10. The convex portions 22 except for the convex portions 22 that are temporarily bonded and joined to the side surface portion 11b and joined to the side surface portion 11b abut against the side surface portion 11b via the adhesive 27, and the side surface portion 11b is bonded by the adhesive 27. It is glued to.

3, the convex part 22 couple | bonded with the side part 11b is shown with the code | symbol 22A, and the convex part 22 adhere | attached on the side part 11b with the adhesive agent 27 is shown with the code | symbol 22B. As shown in FIG. 3, the protrusions 22A and 22B have heights H _A and H _B from the base 21, respectively, and the protrusions 22B excluding the protrusions 22A coupled to the side surface part 11b have the side surface parts 11b. The height of the convex portion is formed lower than the convex portion 22 </ b> A coupled to.

  As the adhesive 27, a thermosetting adhesive that foams when heated to a predetermined temperature is used. As shown in FIGS. 2 and 3, the adhesive 27 is formed in a sheet shape having a predetermined thickness, and the adhesive 27 is attached to the reinforcing member 20 before foaming, and is kept at a predetermined temperature. Foamed by heating and filled between the frame main body 10 and the reinforcing member 20, and inclined by 45 degrees with respect to the longitudinal direction of the frame main body 10 between the frame main body 10 and the reinforcing member 20 by the groove 25. The formed mesh-like space 26 is filled.

  FIG. 5 is a cross-sectional view of the vehicle body frame before the adhesive attached to the reinforcing member is foamed, and the cross-section corresponding to the cross-section shown in FIGS. 2A and 2B is shown in FIG. And (b). As shown in FIG. 5, the adhesive 27 formed in a sheet shape is superimposed on the frame body 10 side of the reinforcing member 20 before foaming, specifically, on the frame body 10 side of the base portion 21 and the convex portion 22. It is attached.

  The adhesive 27 is also formed with an opening 27a corresponding to the convex portion 22 coupled to the side surface portion 11b of the first plate-like member 11 of the frame body 10, and the opening 27a is coupled to the side surface portion 11b. A portion covering the top surface portion 22a of the convex portion 22 is formed in a quadrangular shape.

  Thus, the adhesive 27 formed in a sheet shape is attached to the frame body 10 side of the reinforcing member 20 so that the adhesive 27 and the frame body are formed by the groove 25 before foaming of the adhesive 27. Thus, a mesh-like gap 28 that is continuous in the longitudinal direction of the frame main body 10 is formed between the two.

  In the present embodiment, the adhesive member 27 is attached to the reinforcing member 20 so as to overlap the frame main body 10 side, and the reinforcing member 20 is attached in a state where the convex portion 22 of the reinforcing member 20 is brought into contact with the side surface portion 11b through the opening 27a. It arrange | positions inside the flame | frame main body 10, and the convex part 22 and the side part 11b are temporarily fixed-welded and couple | bonded. Thereafter, the adhesive 27 is foamed by performing a heat drying process, and the adhesive 27 is filled between the frame body 10 and the reinforcing member 20, and the mesh-like space portion 26 formed by the groove portion 25 is filled. The frame body 10 and the reinforcing member 20 are bonded.

  Further, the reinforcing member 20 is formed with a planar flange portion 23 at the upper end portion in the orthogonal cross-section direction of the frame body 10, and the flange portion 23 is a bottom surface of the first plate-like member 11 of the frame body 10. Attached to the bottom surface portion 11a along the portion 11a.

  The vehicle body frame 1 configured as described above is arranged so that the bottom surface portion 11a of the first plate-like member 11 faces in a direction in which a load is assumed to act. Thereby, when a load acts 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 a tensile direction occurs on the flat surface portion 12 a of the second plate member 12. As a result, the tensile stress is generated.

  Thus, in the vehicle frame structure according to the first embodiment of the present invention, the reinforcing member 20 attached to the inside of the frame body 10 has the base portion 21 and the plurality of convex portions 22, and the plurality of convex portions. 22 is provided such that a groove portion 25 formed between adjacent convex portions 22 is formed in a mesh shape inclined at a predetermined angle with respect to the longitudinal direction of the frame body 10. Thereby, it can suppress that the flame | frame main body 10 swells outward by the mesh-shaped space part 26, and deform | transforms out-of-plane, and the bending resistance of the flame | frame main body 10 can be raised.

  FIG. 6 is an explanatory view for explaining a structure constituted by a frame main body and a reinforcing member, and shows a cross-sectional view of the main part of the vehicle body frame in which the reinforcing member is attached to the inside of the frame main body shown in FIG. ing. As shown in FIG. 6, the frame body 10 and the reinforcing member 20 attached to the side surface portion 11 b of the first plate-like member 11 of the frame body 10 are closed between the frame body 10 and the reinforcing member 20. A structure 29 having a cross section 29a is formed.

  In the structure 29, as shown in FIG. 6, the frame main body 10 and the reinforcing member 20 are arranged apart from the bending neutral shaft 30, so that the structure 29 causes the frame main body 10 to have its second moment of section. Has an enhanced structure. 6 illustrates the cross section in the longitudinal direction of the frame main body 10, the cross sectional direction of the frame main body 10 similarly has a closed cross section between the frame main body 10 and the reinforcing member 20. A structure is formed, and the frame main body 10 has a structure in which the second moment of section is increased.

  When a load is applied to the body frame 1 from the outside to bend and deform, the side surface portion 11b of the first plate-like member 11 of the frame body 10 swells outward from the body frame 1 to cause out-of-plane deformation. 6, the bending deformation as shown in FIG. 6 occurs in the longitudinal direction and the orthogonal cross-sectional direction of the frame main body 10, but the rigidity of the side surface portion 11b of the frame main body 10 is increased by the structure 29 having the closed cross-sectional portion 29a. It can suppress and it can suppress that the side part 11b swells to an outward side, and deform | transforms out of plane, and the bending resistance of the frame main body 10 can be raised.

  Further, in the vehicle frame structure according to the first embodiment of the present invention, the adhesive 27 is filled in the mesh-like space 26 formed between the frame body 10 and the reinforcing member 20 by the groove 25. As a result, a portion corresponding to the space 26 between the frame body 10 and the reinforcing member 20 is constrained by the frame body 10 via the adhesive 27, so that it becomes a starting point for out-of-plane deformation of the frame body 10. A discontinuous portion with the side surface portion 11b by the reinforcing member 20 that is easy, for example, a portion indicated by β ′ in FIG. 6 can be eliminated, and the bending resistance of the frame body 10 can be further increased.

  Thus, according to the vehicle body frame structure according to the first embodiment of the present invention, the mesh shape formed between the frame body 10 and the reinforcing member 20 and inclined at a predetermined angle with respect to the longitudinal direction of the frame body 10. It is possible to suppress the frame main body 10 from bulging outward and being deformed out of plane by the space portion 26, and corresponding to the space portion 26 between the frame main body 10 and the reinforcing member 20 via the adhesive 27. Therefore, the starting point of out-of-plane deformation of the frame body 10 can be eliminated, and the bending resistance of the frame body 10 can be increased.

  The adhesive 27 is formed in a sheet shape having a predetermined thickness, and an opening 27 a is formed corresponding to the convex portion 22 coupled to the side surface portion 11 b of the first plate-like member 11 of the frame body 10. In this state, the adhesive 27 is attached to the reinforcing member 20 relatively easily without having to apply the adhesive 27 to the reinforcing member 20. In addition, the convex portion 22 and the frame body 10 can be coupled through the opening 27a, and the reinforcing member 20 can be accurately arranged at a predetermined position. Further, since the adhesive 27 is a thermosetting adhesive that foams when heated to a predetermined temperature, the adhesive 27 is foamed between the bonded reinforcing member 20 and the frame body 10 in the heat drying step. The frame body 10 and the reinforcing member 20 can be securely bonded.

  Further, the adhesive 27 is attached to the reinforcing member 20 so as to overlap the frame body 10 before foaming, and in the longitudinal direction of the frame body 10 between the adhesive 27 and the frame body 10 corresponding to the groove 25. By forming the continuous mesh-shaped gap 28, the electrodeposition liquid is transferred to the frame main body when the electrodeposition coating process is performed after the frame main body 10 and a part of the protrusions 22 of the reinforcing member 20 are joined. 10 and the reinforcing member 20 can be inserted, and the corrosion resistance can be improved.

  Furthermore, the convex portion 22B except the convex portion 22A coupled to the side surface portion 11b of the reinforcing member 20 is formed so that the height of the convex portion is lower than that of the convex portion 22A coupled to the side surface portion 11b. Thus, the bonding force between the reinforcing member 20 and the frame body 10 can be increased by contacting the side surface portion 11b through the adhesive 27 and being bonded to the side surface portion 11b by the adhesive 27.

  In the present embodiment, an experiment was performed on the body frame 1 to measure the bending load by applying a load from the outside. In this implementation, the indenter was lowered at a constant speed in the longitudinal center portion of the body frame 1, and the bending load with respect to the descending stroke of the indenter was measured. As a comparative example, the vehicle body frame (Comparative Example 1) having only the frame main body 10 and a part of the convex portion 22 of the reinforcing member are attached to the frame main body by temporarily fixing and bonding without using an adhesive. The actual body frame (Comparative Example 2) was also manufactured and measured.

  FIG. 7 is a graph showing the measurement result of the bending load with respect to the descending stroke of the indenter that loads the vehicle body frame. In FIG. . In FIG. 7, the measurement result of the vehicle body frame 1 is represented by a solid line as an example, the comparative example 1 is represented by a one-dot chain line, and the comparative example 2 is represented by a broken line.

  As shown in FIG. 7, the bending load of the vehicle body frame has a maximum bending load of about 37 kN in the example, about 24 kN in the comparative example 1, and about 10 kN in the comparative example 2. Compared with the case of the comparative example 1 and the comparative example 2, the result that the maximum value of a bending load became high was obtained. Thus, in the vehicle body frame 1, the bending load of the vehicle body frame can be increased by filling the adhesive 27 between the frame body 10 and the reinforcing member 20, and the bending resistance of the frame body can be increased. The reason why the maximum value of the bending load of Comparative Example 2 is larger than that of Comparative Example 1 is that the structure 29 having the closed cross-sectional portion 29a increases the rigidity of the side surface portion 11b of the frame body 10 and the side surface portion 11b bulges outward. This is because the maximum value of the bending load of the embodiment is larger than that of the comparative example 2, and the frame body 10 and the reinforcing member 20 are continuously connected via the adhesive 27. This is because a portion that tends to become a starting point of out-of-plane deformation by being coupled is excluded.

  FIG. 8 is a perspective view showing a vehicle body frame to which the vehicle frame structure according to the second embodiment of the present invention is applied. FIG. 9 is a cross-sectional view of the vehicle body frame taken along line Y9-Y9 in FIG. is there. In the body frame according to the second embodiment, in the body frame 1 according to the first embodiment, the reinforcing member 20 extends from the upper corner portion 10a of the frame body 10 to the lower corner portion 10b. Those having the same configuration as the body frame 1 and having the same function are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, 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 according to the first embodiment. A reinforcing member 40 is attached along the longitudinal direction of the main body 10, and the reinforcing member 40 extends along the side surface portion 11b in a state of being separated from the side surface portion 11b of the first plate-like member 11 of the frame main body 10 by a predetermined distance. It has the base 41 which exists, and the some convex part 42 which protrudes toward this side part 11b from this base 41, and is formed in square pyramid shape.

  The plurality of convex portions 42 are periodically arranged in the longitudinal direction and the orthogonal cross-sectional direction of the frame body 10, and the groove portion 45 formed by the base portion 41 and the side surface portion 42 b of the convex portion 42 between the adjacent convex portions 42. However, in this embodiment, it is provided so as to be formed in a mesh shape with an inclination of 45 degrees with respect to the longitudinal direction of the frame body 10. As a result, a mesh-like space 46 is formed between the frame body 10 and the reinforcing member 20 and is inclined 45 degrees with respect to the longitudinal direction of the frame body 10.

  The plurality of convex portions 42 are also formed such that some convex portions 42 abut against the side surface portion 11b and are temporarily bonded to the side surface portion 11b to be joined, and the convex portions 42 excluding the convex portions 42 coupled to the side surface portion 11b. The frame body 10 and the reinforcing member 40 are in contact with the side surface portion 11b via an adhesive 27, and are bonded to the side surface portion 11b with the adhesive 27.

  As in the case of the vehicle body frame 1, the adhesive 27 is formed in a sheet shape having a predetermined thickness, and corresponds to the convex portion 42 coupled to the side surface portion 11b, that is, covers the top surface portion 42a of the convex portion 42. In a state in which a rectangular opening 27a is formed corresponding to the portion, the reinforcing member 40 is attached to be overlapped on the frame main body 10 side, and accordingly, the adhesive 27 and the frame main body 10 correspond to the groove 45. A mesh-like void portion that is continuous in the longitudinal direction of the frame body 10 is formed therebetween.

  Then, the adhesive member 27 is attached to the reinforcing member 40 so as to overlap the frame body 10 side, and the reinforcing member 40 is attached to the side surface portion 11b through the opening portion 27a. The projection 42 and the side surface portion 11b are temporarily bonded and joined to each other. Thereafter, the adhesive 27 is foamed by performing a heat drying step, the adhesive 27 is filled between the frame body 10 and the reinforcing member 40, and the mesh-like space 46 formed by the groove 45 is filled, The frame body 10 and the reinforcing member 40 are bonded.

  In the vehicle body frame 31, the reinforcing member 40 extends from the upper corner portion 10 a of the frame main body 10 to the lower corner portion 10 b in the orthogonal cross-sectional direction of the frame main body 10. A flat flange portion 44 is provided at a lower end portion in the orthogonal cross-sectional direction, and the flange 44 includes a flange portion 11c of the first plate member 11 of the frame body 10 and a flat portion 12a of the second plate member 12. It is attached in a state sandwiched between. Thereby, it can prevent that the reinforcement member 40 remove | deviates from the frame main body 10 when a load acts from the outside.

  Also in the vehicle body frame 31 configured as described above, the frame body 10 is formed by a mesh-like space 46 formed between the frame body 10 and the reinforcing member 40 and inclined at a predetermined angle with respect to the longitudinal direction of the frame body 10. While being able to suppress outward deformation due to swelling outward, a portion corresponding to the space 46 between the frame body 10 and the reinforcing member 40 is restrained by the frame body 10 via the adhesive 27. Therefore, the origin of out-of-plane deformation of the frame body 10 can be eliminated, and the bending resistance of the frame body 10 can be increased.

  In the present embodiment, the convex portions 22 and 42 of the reinforcing members 20 and 40 are formed in a quadrangular pyramid shape, but may be formed in other truncated pyramid shapes, or may be formed in a truncated cone shape. It is also possible to do. In the present embodiment, the adhesive 27 formed in a sheet shape is attached to the reinforcing members 20 and 40 in an overlapping manner, but the adhesive 27 formed in a sheet shape on the reinforcing members 20 and 40 by, for example, injection molding or the like. It is also possible to integrally mold.

  The bottom surface portion 11a of the first plate-like member 11 on which a force in the compression direction acts when a load is applied to the vehicle body frames 1 and 31 from the outside corresponds to the first surface portion described in the claims of the present application. The flat surface portion 12a of the second plate-like member 12 on which the direction force acts corresponds to the second surface portion described in the claims of the present application, and the first portion located between the bottom surface portion 11a and the flat surface portion 12a. The side surface portion 11b of the plate-like member 11 corresponds to a third surface portion described in the claims of the present application.

  The present invention provides a vehicle frame structure in which a reinforcing member is attached to the inside of a tubular frame body, and can suppress out-of-plane deformation of the frame body and eliminate the origin of out-of-plane deformation of the frame body. A frame structure for a vehicle body that can increase bending resistance can be provided, and may be widely used for a vehicle body frame that forms part of a vehicle body such as a center pillar or a side sill.

DESCRIPTION OF SYMBOLS 1, 31 Body frame 10 Frame main body 10a, 10b Corner | angular part 11 1st plate-shaped member 11a Bottom part (1st surface part) of 1st plate-shaped 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 Reinforcement member 21, 41 Base portion 22, 22A, 22B, 42, convex portion 25, 45 groove portion 26, 46 space portion 27 adhesive 27a opening portion 28 gap portion

Claims (4)

A vehicle frame structure in which a reinforcing member is attached along the longitudinal direction of the frame main body inside a tubular frame main body to which a load can act from the outside,
The frame body is positioned between a first surface portion on which a force in the compression direction acts when a load is applied from the outside, a second surface portion on which a force in the tensile direction acts, and the first surface portion and the second surface portion. A third surface portion that forms a corner portion between the first surface portion and the second surface portion, and
The reinforcing member includes a base portion extending along the third surface portion in a state of being separated from the third surface portion, and projecting from the base portion toward the third surface portion so as to contact the third surface portion, and at least a part thereof Has a plurality of convex portions coupled to the third surface portion, and is attached to a region including a corner portion between the first surface portion and the third surface portion of the frame body,
The plurality of convex portions are provided such that grooves formed between adjacent convex portions are formed in a mesh shape inclined at a predetermined angle with respect to the longitudinal direction of the frame body,
An adhesive that bonds the frame body and the reinforcing member is filled in a mesh-like space formed between the frame body and the reinforcing member by the groove.
A vehicle frame structure characterized by that. The adhesive is a thermosetting adhesive that foams when heated to a predetermined temperature, and is formed into a sheet shape having a predetermined thickness, corresponding to a convex portion that is coupled to the third surface portion of the frame body. It is attached to the frame body side of the reinforcing member in a state where an opening is formed,
The vehicle frame structure according to claim 1. Before the foaming of the adhesive, the adhesive is attached so as to overlap the frame main body side of the reinforcing member, and the longitudinal direction of the frame main body is between the adhesive and the frame main body corresponding to the groove portion. A continuous void is formed in the
The vehicle frame structure according to claim 2. The convex portions excluding the convex portion combined with the third surface portion of the reinforcing member are formed such that the height of the convex portion is lower than the convex portion combined with the third surface portion, and the third portion is interposed via the adhesive. Abutting on the surface portion and being bonded to the third surface portion by the adhesive;
The vehicle frame structure according to claim 2 or claim 3, wherein