JP5509809B2 - 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 the compression side against a bending load and is reinforced in a B pillar having a closed cross-sectional structure. 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 filled with foam.

JP 2008-279904 A JP 2001-191949 A

  However, when a reinforcing member is attached and reinforced inside the closed cross-section member as disclosed in Patent Document 1 and Patent Document 2, 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. Is required to further reduce weight in order to improve fuel efficiency, and further improvement is desired.

  On the other hand, as described above, body frames such as side pillars and side sills are loaded on the body frame from the outside in order to ensure the safety of the occupant when subjected to a collision from the side of the vehicle body (so-called side collision), for example. It is required to ensure a sufficient bending resistance so that bending deformation does not occur when the is input. 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, When the bending load is input, the first surface portion on which the force in the compression direction acts begins to deform inward of the closed cross-section member along the load input direction, and is adjacent to the first surface portion along with this deformation. The side surface bulges outward from the closed cross-section member to cause out-of-plane deformation, and the second surface portion to which a force in the tensile direction acts when a load is input is deformed to the inward side of the closed cross-section member and closes. It was found that the cross-sectional member was bent and deformed and buckled.

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

  Therefore, the present invention is a vehicle frame structure in which a resin reinforcing member is attached inside a metal closed cross-section member, and is deformed along with the bending deformation of the first surface portion toward the inward side of the closed cross-section member. An object is to suppress out-of-plane deformation of the side surface portion to be performed and to efficiently ensure a bending resistance while achieving weight reduction.

For this reason, the vehicle body frame structure according to claim 1 of the present application has a vehicle frame structure in which a resin reinforcing member is attached in 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 to which a force in the compression direction acts, a second surface portion to which a force in the tensile direction acts, and a closed surface member of the closed cross-section member when a bending load is input from the outside. A plurality of plate-like second members extending in the longitudinal direction of the closed cross-section member in parallel along the side surface portion. One rib and a plurality of plate-like second ribs extending in a direction crossing the closed cross-section member, and the rib located closest to the side surface of the closed cross-section member among the first ribs And the second rib is at least the side surface portion of the first rib. Strength as an adhesive bonded rib is coupled to the ribs adjacent in a direction transverse to the ribs and closed-section member, the reinforcing member is closer to the side surface portion side of the closed-section member in a direction crossing the closed-section member Is configured to increase .

Furthermore, the invention according to claim 2 of the present application is the invention according to claim 1 , wherein the size of the opening formed by the first rib and the second rib is closed in the direction crossing the closed cross-section member. It is formed smaller as it approaches the side surface side of the member, or thicker as the thickness of the second rib approaches the side surface side of the closed cross-section member in the direction crossing the closed cross-section member. It is what.

Still further, the invention according to claim 3 of the present application is the invention according to claim 1 or 2 , wherein the ribs on both sides located closest to the side surface portion of the closed cross-section member of the first rib are the closed. It is characterized in that it is bonded and bonded to the side portions on both sides of the cross-sectional member, and is connected via the second rib.

Furthermore, the invention according to claim 4 of the present application is the invention according to any one of claims 1 to 3 , wherein the reinforcing member is disposed along the first surface portion. The flat plate portion is further provided with a flat plate portion, and the first rib and the second rib are bonded to the flat plate portion.

  According to the vehicle body frame structure according to claim 1 of the present application, when a bending load is input from the outside, the rigidity of the side surface portion is increased by the first rib of the reinforcing member adhesively bonded to the side surface portion. Can be prevented from bulging outward and being deformed out of plane, and the side surface portion is formed by a second rib that is coupled to the first rib that is adhesively bonded to the side surface portion and extends in a direction crossing the closed cross-section member. Deformation can be further suppressed, so that the out-of-plane deformation of the side surface deformed in accordance with the bending deformation of the first surface portion toward the inward side of the closed cross-section member can be suppressed, and the bending drag can be achieved while reducing the weight. Can be secured efficiently.

Moreover, reinforcement members, by which the intensity is configured to increase toward the side surface portion side of the closed-section member in a direction transverse to the closed-section member, it is possible to enhance the effect of suppressing deformation of the side surface portion, The said effect can be show | played more effectively.

Furthermore, according to the invention according to claim 2 of the present application, the size of the opening formed by the first rib and the second rib decreases as it approaches the side surface of the closed cross-section member in the direction crossing the closed cross-section member. Since the thickness of the second rib is increased as the thickness of the second rib approaches the side surface side of the closed cross-section member in the direction crossing the closed cross-section member, the effect can be more specifically achieved by a relatively simple structure. Can be realized.

Furthermore, according to the invention according to claim 3 of the present application, the ribs on both sides of the first rib located closest to the side surface portion of the closed cross-section member are respectively adhesively bonded to the side surface portions on both sides of the closed cross-section member. In addition, by being connected through the second rib, the outward deformation of the side surface portions on both sides of the closed cross-section member can be suppressed by the second rib extending in the direction crossing the closed cross-section member. Therefore, the effect can be obtained effectively.

Furthermore, according to the invention of claim 4 of the present application, the reinforcing member further includes a flat plate portion disposed along the first surface portion and adhesively bonded to the first surface portion, and the first flat portion is provided with the first flat portion. By connecting the rib and the second rib, when a bending load is input from the outside, the rigidity of the first surface portion is directly increased by the flat plate portion of the reinforcing member adhesively bonded to the first surface portion. Bend deformation of the closed cross-section member because the flat plate portion can be strengthened against compression by the first rib and the second rib of the reinforcing member coupled to the flat plate portion. Bending deformation of the first surface portion toward the inward side of the closed cross-section member that can occur in the initial stage can be suppressed, and the above-described effect can be more effectively achieved.

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 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. FIG. 4 is a cross-sectional view of the vehicle body frame taken along lines Y4a-Y4a and Y4b-Y4b in FIG. It is a perspective view which shows the vehicle body frame to which the frame structure for vehicles which concerns on the 3rd Embodiment of this invention is applied. FIG. 6 is a cross-sectional view of the vehicle body frame taken along lines Y6a-Y6a and Y6b-Y6b 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. FIG. 8 is a cross-sectional view of the vehicle body frame taken along lines Y8a-Y8a and Y8b-Y8b in FIG. 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. 10 is a cross-sectional view of the vehicle body frame taken along lines Y10a-Y10a and Y10b-Y10b 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. 11 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. 11 (a) analyzes the bending deformation behavior of the vehicle body frame. FIG. 11B is a diagram illustrating a state in which a load is applied to the vehicle body frame and the vehicle body frame is bent, and FIG. 12 illustrates a result of simulation analysis of the bending deformation behavior of the vehicle body frame. FIG. 13 is a cross-sectional view showing a cross section of the bent portion of the vehicle body frame in FIG. In FIG. 12, 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. 12 and 13 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. 12 and 13, as a body frame 200 formed in a metal closed cross-sectional shape, an upper surface portion 200 a and a lower surface provided in parallel with the upper surface portion 200 a in a state of being separated from the upper surface portion 200 a. Portion 200b, side surface portions 200c on both sides adjacent to upper surface portion 200a and lower surface portion 200b and positioned between upper surface portion 200a and lower surface portion 200b of vehicle body frame 200, that is, on the right side of upper surface portion 200a in FIGS. A right side surface portion 200c positioned between the end portion and the right end portion of the lower surface portion 200b, and a left side surface portion 200c positioned between the left end portion of the upper surface portion 200a and the left end portion of the lower surface portion 200b. The vehicle body frame 200 is bent and deformed by applying a bending load from the outside to the vehicle body frame 200 using a model formed in a rectangular closed cross section. The deformation behavior when the simulation analysis.

  Specifically, as shown in FIG. 11 (a), a vehicle body frame 200 having a predetermined length X1 is supported by two fixed 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. 11 (b), the vehicle body frame 200 is bent and deformed in a convex shape downward, and the vehicle body frame 200 is 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. 14 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. 12 and FIG. 13, the indenter 202 is lowered from above the vehicle body frame 200, when downward stroke of the indenter indenter 202 is positioned in contact with the upper surface portion 200a is _{S 0,} the vehicle body frame In FIG. 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 202 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. 12 and FIG. 13, 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 is formed in the corner portion 200d as shown by a deformation portion α in FIG. Occurs. Further, as shown in FIG. 13B, 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. 14, the reaction force F ′ with respect to the load F is decreased along with the descending stroke of the indenter 202, and as shown in (c) and (d) of FIGS. 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 the closed cross-section member formed in a substantially rectangular closed cross-section shape, and when the bending load is input, The first surface portion on which the force acts begins to deform inward of the closed cross-section member along the load input direction, and the side surface portion adjacent to the first surface portion is moved outward of the closed cross-section member along with this deformation. Inflating and causing out-of-plane deformation, and when the load is input, the second surface portion on 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 it.

  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, based on these simulation analysis results and experimental results, if the out-of-plane deformation of the side surface portion that deforms with the bending deformation of the first surface portion toward the inward side of the closed cross-section member can be suppressed, the closed cross-section member It is considered that the bending deformation can be effectively suppressed, and the bending resistance of the closed cross-section member can be efficiently ensured while reducing the weight.

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, 5, 7 and 9 to be described later, in order to clearly show the reinforcing member in the frame main body, the frame main body is shown 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 a vehicle frame structure according to a first embodiment of the present invention is applied includes a frame main body 10 as a closed cross-sectional member formed in a closed cross-sectional shape, a frame A reinforcing member 20 is attached to the inside of the frame main body 10 along the longitudinal direction of the main body 10 and reinforces 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 is coupled to the flat plate portion 21 formed in a substantially rectangular shape according to the shape of the bottom surface portion 11 a of the first plate member 11, and the flat plate portion 21, and is substantially perpendicular to the flat plate portion 21. And a rib portion 23 having ribs 22 extending in the direction to the flat surface portion 12a of the second plate-like member 12 and arranged in a lattice shape.

  As shown in FIG. 2, the ribs 22 arranged in a lattice shape include a plurality of plate-like vertical ribs 22 a extending in the longitudinal direction of the frame body 10 in parallel along the side surface portion 11 b of the first plate-like member 11. And a plurality of plate-like lateral ribs 22b extending perpendicularly to the longitudinal direction of the frame main body 10 and extending across the frame main body 10. The plurality of vertical ribs 22a and the plurality of horizontal ribs 22b are provided in parallel, and the vertical ribs 22a and the horizontal ribs 22b are coupled to each other at a right angle. Thereby, in the rib part 23, the opening part 24 opened in the direction which goes to the plane part 12a of the 2nd plate-shaped member 12 from the bottom face part 11a of the 1st plate-shaped member 12 by the vertical rib 22a and the horizontal rib 22b. Is formed in a quadrangular shape.

  In the reinforcing member 20, the flat plate portion 21 is disposed along the bottom surface portion 11 a of the first plate-like member 11, and is bonded and bonded to the bottom surface portion 11 a by the foamable adhesive 27 a, and the rib portion in the direction crossing the frame body 10. Both side surfaces of 23 are disposed along the side surface portion 11b of the first plate-like member 11, and are adhesively bonded to the side surface portion 11b by a foamable adhesive 27b.

  Specifically, both side surfaces of the rib portion 23 are constituted by the vertical ribs 22a positioned on the side of the side surface portion 11b of the frame main body 10 among the plurality of plate-like vertical ribs 22a extending in the longitudinal direction of the frame main body 10. The vertical ribs 22a on both sides of the frame body 10 located closest to the side surface portion 11b are adhesively bonded to the side surface portions 11b on both sides of the frame body 10 by a foaming adhesive 27b.

  In the vehicle body frame 1, as shown in FIG. 2 (b), each of the horizontal ribs 22b is bonded to at least the side surface portion 11b of the vertical ribs 22a, and the vertical ribs 22a and the frame body 10 are bonded. Are connected to the adjacent vertical ribs 22a. In the present embodiment, each of the horizontal ribs 22b extends from the vertical rib 22a located on the side of the most side surface 11b of the frame body 10 to the vertical rib 22a located on the side of the other side surface 11b. The vertical ribs 22a that are respectively bonded to the side surface portions 11b on both sides of the frame body 10 are respectively bonded to the vertical ribs 22a. It is connected via a rib 22b.

  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.

  In the present embodiment, the reinforcing member 20 attached to the inside of the frame main body 10 has the ribs 22a on both sides located closest to the side surface portion 11b of the frame main body 10 bonded and bonded to the side surface portions 11b on both sides. Only one of the vertical ribs 22a on both sides of the frame body 10 closest to the side surface portion 11b is adhesively bonded to the side surface portion 11b facing the rib 22a, and the other vertical rib 22a is connected to the rib 22a. It is also possible to make it separate from the side part 11b which opposes

  Thus, in the vehicle frame structure according to the first embodiment of the present invention, the reinforcing member 20 is attached to the inside of the frame body 10, and the frame body 10 is compressed when a bending load is input from the outside. The bottom surface portion 11a of the first plate-like member 11 on which the force in the direction acts, the flat surface portion 12a of the second plate-like member 12 on which the force in the tensile direction acts, and the first plate-like member 11 of the frame body 10 The side surface portions 11b of the first plate member 11 on both sides located between the bottom surface portion 11a and the flat surface portion 12a of the second plate member 12, and the reinforcing member 20 is provided on the side surface portion 11b. A plurality of plate-like vertical ribs 22a extending in parallel in the longitudinal direction of the frame body 10 and a plurality of plate-like horizontal ribs 22b extending in a direction crossing the frame body 10, and the frame of the vertical ribs 22a. The most side surface 11b side of the main body 10 The ribs located are adhesively bonded to the side surface portion 11b, and the lateral ribs 22b are adjacent to at least the rib 22a adhesively bonded to the side surface portion 11b of the vertical ribs 22a, in the direction crossing the rib 22a and the frame body 10. It is combined with the matching rib 22a.

  Thereby, when a bending load is input from the outside, the side surface portion of the first plate member 11 that can be deformed along with the deformation of the bottom surface portion 11a of the first plate member 11 on which a force in the compression direction acts. The longitudinal ribs 22a of the reinforcing member 20 that are adhesively bonded to 11b can increase the rigidity of the side surface portion 11b to prevent the side surface portion 11b from bulging outward and being deformed out of plane, and adhere to the side surface portion 11b. The lateral ribs 22b coupled to the coupled longitudinal ribs 22a and extending in the direction crossing the frame main body 10 can further prevent the side surface portion 11b from being deformed, so that the bottom surface portion 11a toward the inner side of the frame main body 10 can be prevented. The out-of-plane deformation of the side surface portion 11b that is deformed along with the bending deformation can be suppressed, and the bending resistance can be efficiently ensured while reducing the weight.

  In addition, the vertical ribs 22a on both sides of the vertical ribs 22a located closest to the side surface portion 11b of the frame main body 10 are adhesively bonded to the side surface portions 11b on both sides of the frame main body 10 respectively, and via the horizontal ribs 22b. By being coupled, the outward deformation of the side surface portions 11b on both sides of the frame body 10 can be suppressed by the lateral ribs 22b extending in the direction crossing the frame body 10, so that the above effect is effectively obtained. be able to.

  The reinforcing member 20 further includes a flat plate portion 21 that is disposed along the bottom surface portion 11a of the first plate-like member 11 and is adhesively bonded to the bottom surface portion 11a. Since the rib 22b is coupled, when a bending load is input from the outside, the rigidity of the bottom surface portion 11a is directly increased by the flat plate portion 21 of the reinforcing member 20 adhesively coupled to the bottom surface portion 11a. Bending deformation can be suppressed and the flat plate portion 21 can be strengthened against compression by the longitudinal ribs 22a and the lateral ribs 22b of the reinforcing member 20 coupled to the flat plate portion 21, so that the bending deformation of the frame body 10 is improved. Bending deformation of the bottom surface portion 11a toward the inward side of the frame body 10 that can occur in the initial stage can be suppressed.

  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. Reinforcement with foaming adhesives 27a and 27b applied to the flat plate portion 21 and both side surfaces of the rib portion 23 of the reinforcing member 20 inside the frame body 10 composed of the member 11 and the second plate-like member 12, respectively. The member 20 is inserted and held at a predetermined position shown in FIG. The foaming adhesives 27a and 27b are foamed during baking in the electrodeposition coating process, and the reinforcing member 20 is bonded and bonded to the frame body 10 by the foaming adhesives 27a and 27b. 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.

  In the present embodiment, the ribs 22 arranged in a lattice shape are formed by the vertical ribs 22a and the horizontal ribs 22b so as to have a square-shaped opening 24, but in a direction crossing the frame body 10. The extending lateral rib 22b is inclined at a predetermined angle from the direction orthogonal to the longitudinal direction of the frame body 10, and the opening 24 formed by the longitudinal rib 22a and the lateral rib 22b is formed in another shape such as a triangular shape or a hexagonal shape. You may do it. In the present embodiment, the rib 22 is formed so as to extend from the flat plate portion 21 to the flat surface portion 12 a of the second plate-like member 12, but the bottom surface portion of the first plate-like member 11 from the flat plate portion 21. The length of the ribs 22 may be changed as appropriate, such as to an intermediate position between 11a and the planar portion 12a of the second plate member 12.

  FIG. 3 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. 4 is a cross-sectional view of the vehicle body frame taken along line Y4a-Y4a and Y4b-Y4b in FIG. 3, and FIG. 4A is a cross-sectional view of the vehicle body frame taken along line Y4a-Y4a. 4 (b) is a cross-sectional view of the vehicle body frame along the line Y4b-Y4b. Since the second embodiment is different from the first embodiment only in the shape of the rib portion, the same reference numerals are given to those having the same configuration as the first embodiment and having the same function. Therefore, the description is omitted.

  As shown in FIGS. 3 and 4, the vehicle body frame 31 to which the vehicle frame structure according to the second embodiment of the present invention is applied has the reinforcing member 40 disposed inside the frame body 10. A plurality of plate-like vertical ribs 42 a extending in the longitudinal direction of the frame body 10 along the side faces 11 b of the first plate-like member 11 and ribs 42 arranged in a lattice shape, and in a direction crossing the frame body 10 A rib portion 43 having a plurality of plate-like horizontal ribs 42b is provided, but the intervals between the vertical ribs 42a adjacent to each other in the direction crossing the frame body 10 are different.

  As shown in FIG. 4, in the reinforcing member 40 of the vehicle body frame 31, the vertical ribs 42 a extending in the longitudinal direction of the frame main body 10 have the interval between the vertical ribs 42 a adjacent in the direction crossing the frame main body 10 crossing the frame main body 10. Compared to the center side of the frame main body 10 in the direction, the end side of the frame main body 10 is narrower and is approximately half the size. Thereby, in the reinforcing member 40, the opening 44 formed by the vertical rib 42a and the horizontal rib 42b has a substantially square opening 44a on the center side of the frame body 10 in the direction crossing the frame body 10. A substantially rectangular opening formed by dividing the opening 44a on the center side into two in the direction crossing the frame body 10 by the vertical rib 42b on the end side of the frame body 10 in the direction crossing the frame body 10 is formed. 44b.

  Thus, in the vehicle body frame 31, the side surface portion of the frame main body 10 in the direction in which the size of the opening 44 formed by the vertical rib 42 a and the horizontal rib 42 b in the rib portion 43 of the reinforcing member 40 crosses the frame main body 10. The reinforcing member 40 is formed to be smaller as it approaches the 11b side, and the reinforcing member 40 is configured to increase in strength as it approaches the side surface 11b side of the frame body 10 in a direction crossing the frame body 10.

  Even in the vehicle frame structure configured as described above, when the bending load is input from the outside, the side surface portion 11b is prevented from bulging outward and being deformed out of the plane, thereby reducing the weight. Bending resistance can be secured efficiently. Further, in the vehicle body frame 31, the reinforcing member 40 is configured to increase in strength as it approaches the side surface portion 11 b side of the frame main body 10 in the direction crossing the frame main body 10, whereby the first plate member 11. The effect of suppressing the deformation of the side surface portion 11b can be enhanced, and the effect can be more effectively exhibited.

  The vehicle body frame 31 according to the second embodiment is configured such that the size of the opening 44 decreases as the distance from the side surface 11b of the frame body 10 approaches in the direction crossing the frame body 10, and the strength increases. However, it is also possible to increase the strength by forming the thickness of the lateral rib 62b as it approaches the side surface 11b side of the frame body 10 in the direction crossing the frame body 10.

  FIG. 5 is a perspective view showing a vehicle body frame to which a vehicle frame structure according to the third embodiment of the present invention is applied. 6 is a cross-sectional view of the vehicle body frame along the lines Y6a-Y6a and Y6b-Y6b in FIG. 5, and FIG. 6A is a cross-sectional view of the vehicle body frame along the line Y6a-Y6a. 6 (b) is a cross-sectional view of the vehicle body frame along the line Y6b-Y6b. Note that the third embodiment is different from the first embodiment only in the shape of the rib portion, and therefore, the same reference numerals are given to the components that have the same configuration as the first embodiment and perform the same functions. Therefore, the description is omitted.

  As shown in FIGS. 5 and 6, a vehicle body frame 51 to which the vehicle frame structure according to the third embodiment of the present invention is applied has a reinforcing member 60 disposed inside the frame body 10. A plurality of plate-like vertical ribs 62 a extending in the longitudinal direction of the frame body 10 along the side faces 11 b of the first plate-like member 11 and ribs 62 arranged in a lattice shape, and in a direction crossing the frame body 10 Although the rib part 63 which has the some plate-shaped horizontal rib 62b extended is provided, the length in the direction which crosses the flame | frame main body 10 differs in the some horizontal rib 62b.

  As shown in FIG. 6, in the reinforcing member 60 of the vehicle body frame 51, the horizontal rib 62 b is a vertical rib positioned on the side of the other side surface portion 11 b from the vertical rib 62 a positioned on the side of the most side surface portion 11 b of the frame body 10. A first horizontal rib 62b1 extending to the rib 62a and bonded to the side ribs 11b on both sides of the frame main body 10 and bonded to the side ribs 11b, and a vertical rib positioned closest to the side wall 11b of the frame main body 10 There is a second horizontal rib 62b2 extending from 62a to the vertical rib 62a adjacent to the vertical rib 62a and the frame main body 10 in a direction crossing the frame main body 10, and coupled only to the two vertical ribs 62a.

  As shown in FIG. 6B, the lateral ribs 62 b are alternately arranged with the first lateral ribs 62 b 1 and the second lateral ribs 62 b 2 in the longitudinal direction of the frame body 10. Thereby, in the reinforcing member 60, the opening 64 formed by the vertical rib 62a and the horizontal rib 62b is formed so as to have a rectangular opening 64a on the center side of the frame body 10 in a direction crossing the frame body 10. However, on the end side of the frame main body 10, the central opening 64 a is formed to have a square opening 64 b that is divided into two in the longitudinal direction of the frame main body 10 by the second lateral rib 62 b 2. Has been.

  Thus, in the vehicle body frame 51, the side surface portion of the frame body 10 in the direction in which the size of the opening 64 formed by the vertical rib 62 a and the lateral rib 62 b in the rib portion 63 of the reinforcing member 60 crosses the frame body 10. The reinforcing member 60 is formed to be smaller as it approaches the 11b side, and the reinforcing member 60 is configured to increase in strength as it approaches the side surface 11b side of the frame body 10 in a direction crossing the frame body 10.

  Even in the vehicle frame structure configured as described above, when the bending load is input from the outside, the side surface portion 11b is prevented from bulging outward and being deformed out of the plane, thereby reducing the weight. Bending resistance can be secured efficiently. Also in the vehicle body frame 51, the reinforcing member 60 is configured to increase in strength as it approaches the side surface portion 11 b side of the frame body 10 in the direction crossing the frame body 10, whereby the first plate member Thus, the effect of suppressing the deformation of the eleven side surface portions 11b can be enhanced, and the above-described effect can be more effectively exhibited.

  FIG. 7 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. 8 is a cross-sectional view of the vehicle body frame taken along line Y8a-Y8a and Y8b-Y8b in FIG. 7, and FIG. 8A is a cross-sectional view of the vehicle body frame taken along line Y8a-Y8a. 8 (b) is a cross-sectional view of the vehicle body frame taken along line Y8b-Y8b. Since the fourth embodiment is different from the first embodiment only in the shape of the rib portion, the same reference numerals are given to those having the same configuration as the first embodiment and having the same function. Therefore, the description is omitted.

  As shown in FIGS. 7 and 8, a vehicle body frame 71 to which the vehicle frame structure according to the third embodiment of the present invention is applied has a reinforcing member 80 disposed inside the frame body 10. A plurality of plate-like vertical ribs 82a extending in the longitudinal direction of the frame main body 10 along the side faces 11b of the ribs 82 arranged in a lattice shape, that is, in the direction crossing the frame main body 10. The rib portion 83 includes a plurality of plate-like horizontal ribs 82b extending, and the plurality of horizontal ribs 82b are formed so as to be inclined from a direction orthogonal to the longitudinal direction of the frame body 10 and the frame body. The lengths in the direction crossing 10 are different.

  As shown in FIG. 8, in the reinforcing member 80 of the vehicle body frame 71, the horizontal rib 82 b is a vertical rib positioned on the side of the other side surface portion 11 b from the vertical rib 82 a positioned on the side of the most side surface portion 11 b of the frame body 10. The first horizontal ribs 82b1 that extend to the ribs 82a at a predetermined angle from the direction orthogonal to the longitudinal direction of the frame body 10 and are respectively coupled to the longitudinal ribs 82a that are adhesively bonded to the side surface portions 11b on both sides of the frame body 10. And from the vertical rib 82a positioned closest to the side surface portion 11b of the frame body 10 to the vertical rib 82a adjacent to the vertical rib 82a in a direction crossing the frame main body 10, a predetermined angle is inclined from the direction orthogonal to the longitudinal direction of the frame main body 10. And a second lateral rib 82b2 coupled to the two longitudinal ribs 82a.

  The first lateral rib 82b1 is formed in a zigzag shape continuously in the longitudinal direction of the frame body 10, and extends from the longitudinal rib 82a that is adhesively bonded to one side surface portion 11b of the frame body 10. The first horizontal rib 82b1 extending from the vertical rib 82a that is adhesively bonded to the other side surface portion 11b of the frame main body 10 is formed so as to intersect at the center portion in the direction crossing the frame main body 10.

  As shown in FIG. 8B, the second lateral rib 82b2 is composed of a longitudinal rib 82a adhesively bonded to the side surface portion 11b, and a longitudinal rib 82a adjacent to the longitudinal rib 82a in a direction crossing the frame body 10. A vertical rib 82a adhesively bonded to the side surface portion 11b and a direction crossing the vertical rib 82a and the frame main body 10 so as to form a horizontal rib formed in a zigzag shape continuously in the longitudinal direction of the frame main body 10 therebetween. It is provided with the same shape as the first horizontal rib 82b1 between the adjacent vertical ribs 82a.

  Thereby, in the reinforcing member 80, the opening 84 formed by the vertical rib 82a and the horizontal rib 82b has a triangular opening 84a1 and a trapezoidal opening at the center side of the frame body 10 in the direction crossing the frame body 10. 84a2 is formed, and a triangular opening 84b is formed on the end side of the frame body 10 in the direction crossing the frame body 10. In the present embodiment, the opening 84a1 and the opening 84b are formed with the same size, the openings 84b and 84a1 are formed with one-third the size of the opening 84a2, and the average size of the openings 84 is In the direction crossing the frame main body 10, the end side of the frame main body 10 is formed with a half size compared to the center side of the frame main body 10.

  As described above, in the vehicle body frame 71, the side surface portion of the frame main body 10 in the direction in which the size of the opening 84 formed by the vertical rib 82 a and the horizontal rib 82 b in the rib portion 83 of the reinforcing member 80 crosses the frame main body 10. The reinforcing member 80 is formed to be smaller as it approaches the 11b side, and the reinforcing member 80 is configured to increase in strength as it approaches the side surface portion 11b side of the frame body 10 in a direction crossing the frame body 10.

  Even in the vehicle frame structure configured as described above, when the bending load is input from the outside, the side surface portion 11b is prevented from bulging outward and being deformed out of the plane, thereby reducing the weight. Bending resistance can be secured efficiently. Also in the vehicle body frame 71, the reinforcing member 60 is configured to increase in strength as it approaches the side surface portion 11 b side of the frame body 10 in the direction crossing the frame body 10, whereby the first plate member Thus, the effect of suppressing the deformation of the eleven side surface portions 11b can be enhanced, and the above-described effect can be more effectively exhibited.

  FIG. 9 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. 10 is a view of the vehicle body frame taken along lines Y10a-Y10a and Y10b-Y10b in FIG. FIG. 10A is a cross-sectional view of the vehicle body frame along the line Y10a-Y10a, and FIG. 10B is a cross-sectional view of the vehicle body frame along the line Y10b-Y10b. Since the fifth embodiment is different from the first embodiment only in the shape of the rib portion, the same reference numerals are given to those having the same configuration as in the first embodiment and having the same function. The description is omitted.

  As shown in FIGS. 9 and 10, a vehicle body frame 91 to which a vehicle frame structure according to a fifth embodiment of the present invention is applied has a reinforcing member 100 disposed inside the frame body 10, A plurality of plate-like vertical ribs 102 a extending in the longitudinal direction of the frame body 10 along the side faces 11 b of the ribs 102 arranged in a lattice shape, that is, in the direction crossing the frame body 10. A rib portion 103 having a plurality of plate-like lateral ribs 102b extending is provided, and the ribs 102 are formed with different rib heights in a direction crossing the frame main body 10.

  As shown in FIG. 10 (a), in the reinforcing member 100 of the vehicle body frame 91, the lateral ribs 102b of the ribs 102 are the longitudinal ribs 102a on both sides located closest to the side surface portion 11b of the frame body 10 and the first plate. The rib 11 is formed to be shorter than a substantially intermediate position between the bottom surface portion 11 a of the plate-like member 11 and the flat surface portion 12 a of the second plate-like member 12, and toward the center side of the frame body 10 in the direction crossing the frame body 10. The height is low, and it is curved in a concave shape in the direction across the frame body 10.

  Each of the vertical ribs 102a of the rib 102 is formed to have the same rib height as the horizontal rib 102b coupled to the vertical rib 102a, and the frame main body from the end side of the frame main body 10 in the direction crossing the frame main body 10. The height of the rib is formed lower toward the center side of 10.

  As described above, in the vehicle body frame 91, the rib 102 in the rib portion 103 of the reinforcing member 100 has a rib height as it goes from the end side of the frame body 10 toward the center side of the frame body 10 in the direction crossing the frame body 10. Is formed low. 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.

  Also in the vehicle frame structure configured as described above, when the bending load is input from the outside, the bending of the frame body 10 is suppressed by suppressing the side surface portion 11b from bulging outward and being deformed out of the plane. Bending deformation of the bottom surface portion 11a toward the inward side of the frame body 10 that can occur at the initial stage of deformation 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 of the rib 102 crosses the frame main body 10 on the end side of the frame main body 10 and the bottom surface portion 11a of the first plate-like member 11 and the second portion. Although it is formed to be shorter than a substantially intermediate position between the flat member 12a of the plate member 12, it can also be formed to extend to the flat member 12a of the second plate member 12.

  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 on which a force in the tensile direction acts corresponds to the second surface portion described in the claims of the present invention, and the bottom surface portion 11a of the frame body 10 The side parts 11b on both sides located between the flat part 12a correspond to the side parts on both sides described in the claims of this application. Further, the longitudinal ribs 22a, 42a, 62a, 82a, 102a of the reinforcing members 20, 40, 60, 80, 100 correspond to the first rib described in the claims of the present application, and the reinforcing members 20, 40, 60, 80, 100 horizontal ribs 22b, 42b, 62b, 82b, and 102b correspond to the second rib described in the claims of this 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 lattice shape. For the vehicle according to the first to fifth embodiments, the opening 104 formed by the ribs 102 disposed on the side of the frame main body 10 is made smaller in the direction crossing the frame main body 10 as it approaches the side surface 11b side. You may make it comprise combining a frame structure 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 (side surface portion) of first plate-shaped 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 22a, 42a, 62a, 82a, 102a Vertical rib ( 1st rib)
22b, 42b, 62b, 82b, 102b Lateral rib (second rib)
24, 44, 64, 84, 104 opening

Claims (4)

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 the compression direction acts when a bending load is input from the outside, a second surface portion on which a force in the tensile direction acts, and a first surface portion of the closed cross-section member. Having side portions on both sides located between the second surface portion,
The reinforcing member includes a plurality of plate-like first ribs extending in the longitudinal direction of the closed cross-section member in parallel along the side surface portion, and a plurality of plate-like second ribs extending in a direction crossing the closed cross-section member. A rib located closest to the side surface portion of the closed cross-section member of the first rib is adhesively bonded to the side surface portion, and the second rib is at least the side surface portion of the first rib. And a rib bonded to the rib and a rib adjacent to the rib in a direction crossing the closed cross-section member ,
The reinforcing member is configured to increase in strength as it approaches the side surface side of the closed cross-section member in a direction crossing the closed cross-section member.
A vehicle frame structure characterized by that. The size of the opening formed by the first rib and the second rib is formed so as to decrease toward the side surface of the closed cross-section member in the direction crossing the closed cross-section member, or of the second rib The thickness is formed thicker as it approaches the side surface side of the closed cross-section member in the direction crossing the closed cross-section member,
The vehicle frame structure according to claim 1 . The ribs on both sides of the first rib located closest to the side surface portion of the closed cross-section member are bonded and bonded to the side surface portions on both sides of the closed cross-section member, and are coupled via the second rib. Yes,
The vehicle frame structure according to claim 1 , wherein the vehicle frame structure is a vehicle frame structure. The reinforcing member further includes a flat plate portion disposed along the first surface portion and adhesively bonded to the first surface portion, and the first rib and the second rib are bonded to the flat plate portion.
The vehicle frame structure according to any one of claims 1 to 3, characterized in that.