JP5636932B2 - Vehicle frame structure - Google Patents

Description

  The present invention relates to a frame structure such as a side sill or a pillar constituting a vehicle body, and belongs to the field of vehicle body structure technology of a vehicle.

  In vehicles such as automobiles, there are provided various frames such as a side sill disposed on the lower edge of the side of the vehicle body and extending in the front-rear direction, and a pillar disposed along the opening on the side surface of the vehicle body and extending in the vertical direction. This type of frame has the required strength and rigidity to protect the interior of the vehicle against, for example, side collisions and front collisions, or to improve the torsional rigidity of the vehicle body to achieve good steering stability of the vehicle. Therefore, attempts have been made to improve the strength and rigidity of the hollow frame body by providing a reinforcing body within the hollow frame body and suppressing the increase in weight of the entire frame as much as possible.

  For example, Patent Document 1 discloses a metal plate that partitions a closed cross section in a longitudinal direction within a closed cross section formed by a reinforcement of a side sill (rocker) that extends in the front-rear direction along the lower side edge of the vehicle body and an inner panel. In order to effectively suppress the collapse of the closed cross section of the rocker at the time of a side collision, the bulk head is arranged on the plate surface from the lower position on the outer side of the vehicle to the upper side on the inner side of the car. It is set as the structure which provided the reinforcement bead extended to a position.

  Further, in Patent Document 2, a reinforcing member formed in a substantially X shape with a hard resin is disposed in a closed cross section formed by an inner panel and an outer panel that also constitute a side sill (rocker), and the reinforcement is performed. The structure which joined each edge part of the member to four corners of a closed section from the inside using a foaming adhesive agent is disclosed, respectively.

JP 2008-120179 A JP 2009-173109 A

  Each of the configurations of the cited documents 1 and 2 transmits a side impact load inputted to the side sill from the outside of the vehicle body from a corner portion on the vehicle inner side to a corner portion on the vehicle inner side from a corner portion on the vehicle inner side having high rigidity. In order to prevent deformation, the bulkhead disclosed in Patent Document 1 is configured to transmit a side impact load from a lower corner portion on the outer side of the rocker to an upper corner portion on the inner side of the rocker by a reinforcing bead. Also, the one of Patent Document 2 is configured to transmit the side impact load diagonally from the upper and lower corners on the vehicle outer side to the upper and lower corners on the vehicle inner side. The load input to the corner cannot be reliably transmitted to the inside of the vehicle. In the latter case, for example, the load input to the lower corner on the outside of the vehicle is intensively transmitted to the upper corner on the inside of the vehicle. Will not be able to disperse the side impact load. Also, there is a surface 耐側 impact performance is not necessarily enough.

  Therefore, the present invention realizes a structure that can transmit the load from the outside of the vehicle body to the inside of the vehicle while effectively dispersing the load from the outside of the vehicle body as a frame structure for a vehicle such as a side sill and a pillar, The first problem is to effectively suppress the cross-sectional deformation of the frame due to. Moreover, in addition to the said subject, this invention makes it the 2nd subject to implement | achieve the frame structure effective in improving the torsional rigidity of a vehicle body.

  In order to solve the above problems, the present invention is configured as follows.

  First, in the invention according to claim 1 of the present application, two frame constituent members having a substantially U-shaped cross section are opposed to each other at a central surface portion and a pair of side surface portions that are provided on both sides of the central surface portion. A bulkhead is disposed inside the hollow frame body formed by crossing the inside of the frame body, and the central surface portion of one frame constituent member of the two frame constituent members The bulkhead is disposed on the first side portion along the central surface portion of the one frame constituent member and the central surface portion of the other frame constituent member. A plate surface part surrounded by a second side part along the side part of the both frame constituent members and a pair of third side parts connecting the end parts of the first and second side parts, and In the center of the first side part on the plate surface part Two first linear reinforcing portions that connect the portions near the corners at both ends of the side portion and the corners at both ends of the second side portion corresponding to the portion without crossing each other, and the first side Two second linear reinforcing portions that connect each corner portion at both ends of the portion and the corner portions at both ends of the second side portion located on the diagonal line of the corner portion are provided. Features.

  Here, the portion near the corners at both ends of the side where the end on the first side of the first linear reinforcing portion is located includes the corner itself, but for example, around the plate surface portion. In the case where the peripheral wall portion is provided, the end portion on the first side portion side of the first linear reinforcement portion is avoided for reasons of manufacturing or the like to avoid the overlap between the peripheral wall portion and the first linear reinforcement portion. However, it may be provided in the position which approached the center side from the corner | angular part of the both ends of this side part. Moreover, the edge part on the 2nd side part side of the said 1st linear reinforcement part and the corner | angular part in which the edge part by the side of the 1st, 2nd side part of a 2nd linear reinforcement part is located are adjacent edge parts. The vicinity of the corner where

  According to a second aspect of the present invention, in the vehicle frame structure according to the first aspect, the plate surface portion of the bulkhead is joined to the side surface portions of the frame constituent member at the pair of third side portions. A third linear reinforcing portion that connects portions corresponding to is provided.

  According to a third aspect of the present invention, in the vehicle frame structure according to the second aspect, the third linear reinforcing portion is provided so as not to pass through an intersection of the two second linear reinforcing portions. It is characterized by.

  According to a fourth aspect of the present invention, in the vehicle frame structure according to any one of the first to third aspects, the bulkhead is made of resin, and the first and second linear reinforcements are provided. When the third linear reinforcing portion is provided, the third linear reinforcing portion is a rib provided on the plate surface portion.

  The invention according to claim 5 is the vehicle frame structure according to claim 4, wherein the ribs are provided on both surfaces of the plate surface portion.

  The invention according to claim 6 is the vehicle frame structure according to claim 4 or 5, wherein the bulkhead is provided substantially orthogonal to the plate surface portion and surrounds the periphery of the plate surface portion. It has the surrounding wall part.

  According to a seventh aspect of the present invention, in the vehicle frame structure according to the sixth aspect of the present invention, the width dimension along the longitudinal direction of the frame body of the peripheral wall portion is larger than the portion on the first side portion side of the bulkhead. The portion on the second side portion side is made wider.

  The invention according to claim 8 is the vehicle frame structure according to any one of claims 1 to 3, wherein the bulkhead is made of metal, and the first and second linear reinforcements are provided. When the third linear reinforcing portion is provided, the third linear reinforcing portion is a bead provided on the plate surface portion.

  With the above configuration, according to the invention according to the above claims, the following effects can be obtained.

  First, according to the first aspect of the present invention, the first side located on the outer side of the vehicle body on the plate surface portion of the bulkhead disposed inside the hollow frame body so as to cross the inside of the frame body. Two first portions that connect a portion closer to each corner at both ends of the side portion from the center of the portion and a corner portion at both ends of the second side portion corresponding to the portion on the inner side of the vehicle body without crossing each other. Two second linear shapes connecting the linear reinforcing portion, the corner portions at both ends of the first side portion, and the corner portions at both ends of the second side portion located on the diagonal line of the corner portion. Since the reinforcing portion is provided, for example, when a load is applied to the outer surface of the vehicle body of the frame body at the time of a side collision of the vehicle, the load is applied to the first side located on the vehicle outer side of the bulkhead. The corners at both ends of the second side part on the vehicle interior side corresponding to the part from the part near the corners at both ends from the center of the part Toward the second side on the vehicle interior located on the diagonal line of the corner from the corners of the first side located at the same time outside the vehicle. It will be transmitted via the 2nd linear reinforcement part toward the corner | angular part of the both ends of a part.

  In other words, the load is distributed and transmitted from the corner portion at one end of the first side portion on the vehicle outer side or the portion near the corner portion to the corner portions at both ends of the second side portion on the vehicle inner side. The load is also distributed and transmitted to the corners at both ends of the second side part on the inner side of the vehicle from the corner part at the other end of the side part or near the corner part.

  As a result, even when a load applied to the frame body from the outside is input to the outer surface of the frame body in an up-and-down direction, the upper and lower ends of the second side of the bulk head on the vehicle interior side It is transmitted almost evenly to both corners and is received by a wide range of the inside surface of the frame body. As a result, while suppressing the increase in weight and improving the fuel efficiency of the vehicle or improving the energy saving effect, the deformation of the cross-sectional shape of the frame main body due to the load is suppressed, and for example, the side collision resistance of the side sill is improved. Is possible.

  Moreover, according to the invention which concerns on Claim 2, the 3rd linear reinforcement part which connects the site | part corresponding to the junction part of the side surface parts of the said frame structural member in a plate surface part of the said bulkhead in a pair of 3rd side part. Therefore, the deformation of the two joint portions of the frame main body that are separated or approach each other is suppressed. This deformation may occur, for example, due to the torsion of the vehicle body. By suppressing this deformation, the torsional rigidity of the vehicle body is improved and the steering stability of the vehicle is improved.

  By the way, when the third linear reinforcing portion is provided, if the reinforcing portion passes through the intersection of the two second linear reinforcing portions, the three linear reinforcing portions intersect at one point. The load transmitted by each linear reinforcing portion concentrates at the intersection, and the strength of the bulkhead is insufficient in the vicinity of the intersection, which may cause damage.

  On the other hand, according to the invention according to claim 3, when the third linear reinforcing portion is provided, the reinforcing portion is provided so as not to pass through the intersection of the two second linear reinforcing portions. Concentration of load at the intersection is suppressed, and the bulkhead strength is improved, for example, damage to the bulkhead near the intersection is suppressed.

  Moreover, according to the invention which concerns on Claim 4, since the said bulkhead was made from resin and each said linear reinforcement part was made into the rib provided in the plate | board surface part, it is a comparatively simple structure and the above load. A dispersion transmission effect or a cross-sectional deformation suppression effect is realized.

  And according to the invention which concerns on Claim 5, since the said rib was provided in both surfaces of the plate | board surface part when the bulkhead is resin, the load from the vehicle body outer side is not biased to the single side | surface side of a bulkhead, Evenly distributed on both sides and transmitted to the inside of the vehicle, the load is more evenly distributed, and the deformation suppressing effect of the frame body is further improved.

  According to the invention of claim 6, since the peripheral wall portion surrounding the periphery of the plate surface portion is provided in the bulkhead, the load from the outside of the vehicle body input to the frame main body does not exist when the peripheral wall portion does not exist. In comparison, it is input to the bulkhead with a wide width in the longitudinal direction of the frame body, and also transmitted to the inside of the vehicle with a wide width, and the deformation of the frame body is further effectively suppressed, and the bulkhead It is possible to secure a wide bonding area with respect to the inner surface of the frame body, and it is possible to satisfactorily dispose the bulkhead in a regular posture inside the frame body.

  And according to the invention concerning Claim 7, the width dimension in alignment with the longitudinal direction of the frame main body of the surrounding wall part in the said bulkhead was set so that the 2nd side part side might become wider than the 1st side part side. As a result, the load input from the outer surface of the frame body is further distributed and transmitted to the inner surface of the vehicle, and the load distribution and transmission performance of the bulkhead is further improved.

  According to the invention according to claim 8, the bulkhead is made of metal and each linear reinforcing portion is a bead provided on the plate surface portion, so that it is relatively simple like the invention of claim 4. With a simple structure, the load transmission effect can be realized.

It is a perspective view which shows the principal part of the frame structure which concerns on embodiment of this invention. It is sectional drawing which similarly shows the principal part of a frame structure. It is a single perspective view of the bulkhead in the same embodiment. It is also a plan view. It is a side view similarly. It is explanatory drawing of a deformation | transformation of the frame main body by the twist of a vehicle body. It is a front view which shows other embodiment of a bulkhead.

  Hereinafter, an embodiment will be described in which the frame structure of the present invention is applied to a side sill that is disposed on a lower edge of a side portion of a vehicle body and extends in the front-rear direction.

  As shown in FIG. 1, the side sill 1 has a hollow frame body 2, and the frame body 2 includes an outer panel 3 and an inner panel 4, and as shown in FIG. 2, the outer panel 3 Has a central surface portion 3a facing outward from the vehicle body, and an upper surface portion 3b and a lower surface portion 3c that are continuously bent at the upper and lower edges of the vehicle, and has a substantially U-shaped cross section as a whole. Has been. Further, the inner panel 4 has a central surface portion 4a facing inward of the vehicle body, and an upper surface portion 4b and a lower surface portion 4c that are continuously bent at the upper and lower edges of the vehicle body, and is similar to the outer panel 3. The overall cross-sectional shape is substantially U-shaped.

  Further, flange portions 3d and 3e are respectively provided at the end portions of the upper surface portion 3b and the lower surface portion 3c of the outer panel 3, and the flange portions are also provided at the end portions of the upper surface portion 4b and the lower surface portion 4c of the inner panel 4. 4d and 4e are provided, and the front and rear sides are joined by joining the flanges 3d and 3e of the outer panel 3 and the flanges 4d and 4e of the inner panel 4 with the panels 3 and 4 facing each other. A frame body 2 having a hollow portion extending in the direction is formed.

  As shown in FIGS. 1 and 2, in this frame structure, a plurality of (only one is shown) bulkheads 10 made of resin are disposed in the frame body 2 at appropriate intervals within the frame body 2. Is arranged to cross. The periphery of the bulkhead 10 is joined to the inner surface of the frame body 2 via the foamed adhesive 5, thereby partitioning the interior of the frame body 2 in the longitudinal direction.

  Next, the configuration of the bulkhead 10 will be described with reference to FIGS. 3 to 5. The bulkhead 10 includes a plate surface portion 11 that divides the hollow portion of the frame body 2, and the plate surface portion 11. The frame body 2 has a peripheral wall portion 12 extending around both sides of the longitudinal direction of the frame body 2 and surrounding the periphery of the plate surface portion 11, and the overall shape is a first side portion 10 a along the central surface portion 3 a of the outer panel 3, and the first Opposing to the side portion 10a, along the second side portion 10b along the central surface portion 4a of the inner panel 4, and along the upper surface portions 3b, 4b and the lower surface portions 3c, 4c of the panels 3, 4, respectively, The upper and lower ends of the second side portions 10a and 10b have a substantially rectangular shape surrounded by a pair of upper and lower third side portions 10c and 10c.

  In this embodiment, the upper surface portion 3b and the lower surface portion 3c of the outer panel 3 and the upper surface portion 4b and the lower surface portion 4c of the inner panel 4 are all in a U-shape with the flange side slightly opened, 2 has a substantially hexagonal shape, and accordingly, the upper and lower third side portions 10c and 10c of the bulkhead 10 are bent into a mountain shape. To be precise, it has a substantially hexagonal shape.

  4, the width dimension of the peripheral wall portion 12 along the longitudinal direction of the frame body 2 is closer to the second side portion 10b than the first side portion 10a side dimension W1. The dimension W2 is made wider.

  A plurality of ribs are provided on both surfaces of the plate surface portion 11 surrounded by the peripheral wall portion 12 of the bulkhead 10. Next, referring to FIG. 2 and FIG. The structure of the rib will be described.

  First, the portions a and a near the corners 10d and 10d at the upper and lower ends of the first side 10a from the center of the first side 10a of the bulkhead 10 and the corners 10d and 10d corresponding to the top and bottom. Two first ribs 21 and 21 extending in a substantially C shape are provided between the corner portions 10e and 10e at both ends of the two side portions 10b without intersecting each other.

  Also, between the corners 10d, 10d at both ends of the first side 10a and the corners 10e, 10e at both ends of the second side 10b located on the diagonal of these corners 10d, 10d, Two second ribs 22 and 22 extending in an X shape are provided.

  Furthermore, one third rib 23 is provided so as to connect the bent portions b and b forming the mountain shape of the pair of upper and lower third side portions 10c and 10c. The third rib 23 is provided so as not to pass through the intersection c of the two second ribs 22, 22, and includes four first ribs 21, 21 and two second ribs 22, 22 in total. We are in a cross.

  In addition, when the upper and lower third side portions 10c and 10c are bent to have a substantially hexagonal shape as in the bulkhead 10 of this embodiment, there are no manufacturing problems such as die cutting. For example, the end portions on the first side portion 10a side located at the portions a, a of the first ribs 21, 21 may be provided at the corner portions 10d, 10d at both ends of the side portion 10a.

  Further, the bulkhead 10 is provided with an engaging portion 12a for a temporary fixing pin on the outer surface of the peripheral wall portion 12 in the upper portion of the first side portion 10a as a configuration for disposing the bulkhead 10 inside the frame body 2. In addition, a pair of leg portions 12b and 12b are provided on the lower surface of the peripheral wall portion 12 in the lower third side portion 10c.

  When the bulkhead 10 is disposed inside the frame body 2, the unfoamed foaming adhesive 5 is applied to the outer surface of the peripheral wall portion 12 of the bulkhead 10 before the outer panel 3 and the inner panel 4 are joined. Then, as shown in FIG. 2, the pin 6 engaged with the engaging portion 12a is inserted into the hole 3f provided in the outer panel 3, and the leg portions 12b and 12b are placed on the lower surface portion 3c of the outer panel 3. The bulkhead 10 is set inside the outer panel 3. In this state, the outer panel 3 and the inner panel 4 are joined, and then the adhesive 5 is foamed.

  Thereby, as shown in FIGS. 1 and 2, the bulkhead 10 is disposed inside the frame body 2 of the side sill 1 so as to cross the hollow portion of the frame body 2 via the foamed adhesive 5. Will be.

  Next, the operation of the bulkhead 10 in the side sill 1 having the above frame structure will be described.

  As shown in FIG. 2, when a large load F is applied to the side sill 1 from the outside at the time of a side collision of the vehicle, the load F is transferred from the central surface portion 3 a of the outer panel 3 constituting the frame body 2 to the bulkhead 10. Is transmitted to the inner panel 4 side via the bulkhead 10.

  At this time, the portions a and a near the corners 10d and 10d at both ends of the side from the center of the first side 10a, and the corners at both ends of the second side 10b corresponding to the corners 10d and 10d vertically. Since the two first ribs 21 and 21 that extend without crossing each other are provided between the portions 10e and 10e, the load F is first applied via the ribs 21 and 21 to the second side portion 10b. Are transmitted to the corner portions 10e and 10e at both the upper and lower ends of the high rigidity.

  Also, between the corners 10d, 10d at both ends of the first side 10a and the corners 10e, 10e at both ends of the second side 10b located on the diagonal of these corners 10d, 10d, Since the two second ribs 22 and 22 extending so as to cross each other are provided, the load F is applied to the corner portions 10e and 10e at both ends of the second side portion 10b through the ribs 22 and 22, respectively. Will be communicated.

  In other words, the load F is transmitted from the upper corner portion 10d of the first side portion 10a or the vicinity thereof to the upper corner portion 10e of the second side portion 10b via the first rib 21 at the same time. It is also transmitted to the corner 10e below the second side 10b via the second rib 22, and from the corner 10d at the lower end of the first side 10a or in the vicinity thereof, the other second It is transmitted to the lower corner portion 10e of the second side portion 10b via the first rib 21 and simultaneously transmitted to the upper corner portion 10e of the second side portion 10b via the other second rib 22. Thus, the load inputted to the upper part of the first side part 10a and the load inputted to the lower part are both distributed and transmitted to the two corner parts 10e, 10e on the second side part 10b side.

  As a result, not only when the load F applied from the outside to the side sill 1 is input to the central surface portion 3a of the outer panel 3 evenly in the vertical direction, The head 10 is distributed to both the corners 10e and 10e at the upper and lower ends of the second side portion 10b and transmitted almost evenly, and is reliably received by these corners 10e and 10e having high rigidity. As a result, the action of a local load on the inner panel 4 is suppressed, and the deformation of the cross-sectional shape of the side sill 1 or the frame body 2 due to a side impact load or the like is suppressed.

  Further, when a torsional load is applied to the vehicle body due to, for example, unevenness on the road surface, the frame body 2 of the side sill 1 has the upper panel 3b of the outer panel 3 and the inner panel 4 as shown in FIG. 4b and the lower surface portions 3c, 4c of the flanges 3d, 4d and 3e, 4e are deformed so that the upper and lower joint portions x, y are separated from each other.

  In contrast, the bulkhead 10 has a pair of upper and lower third side portions 10c, 10c bent portions b, b, that is, upper and lower joint portions x, y of the outer panel 3 and the inner panel 4 in the frame body 2. Since the third ribs 23 that connect the corresponding portions are provided, the third ribs 23 suppress deformation such that the upper and lower joint portions x and y of the frame body 2 are separated from each other. As a result, the torsional rigidity of the vehicle body is improved, and good steering stability of the vehicle is realized.

  In that case, since the third rib 23 does not pass through the intersection c of the two second ribs 22, 22, it is avoided that the load transmitting these ribs 22, 22, 23 is concentrated at one point, Breakage or the like in the central portion of the bulkhead 10 due to load concentration is suppressed, and the strength of the bulkhead 10 is improved.

  Further, in the bulkhead 10 according to this embodiment, since the first to third ribs 21 to 23 are provided on both surfaces of the plate surface portion 11, a load input from the outer panel 3 of the side sill 1 is applied to the bulkhead 10. Without being biased to one side, the load is evenly distributed on both surfaces of the plate surface portion 11 and transmitted to the inner panel 4 side, and the load dispersion transmission performance is further improved.

  Further, since the peripheral wall portion 12 surrounding the periphery of the plate surface portion 11 is provided, the load F is input to the bulkhead 10 with a relatively wide width in the longitudinal direction of the frame body 2 and also wide toward the inner panel 4 side. The deformation of the frame main body 2 is further effectively suppressed, and a wide bonding area of the bulk head 10 with respect to the inner surface of the frame main body 2 can be secured. It will be arrange | positioned favorably with this attitude | position.

  As shown in FIG. 4, the peripheral wall portion 12 has a dimension W2 on the second side portion 10b side wider than a dimension W1 on the first side portion 10a side. Thus, the load input to the bulkhead 10 is transmitted while being dispersed toward the inner panel 4 side, and the load dispersion transmission performance is further improved.

  Further, in the bulkhead 10 according to this embodiment, as shown in FIG. 3, the heights of the first to third ribs 21 to 23 from the plate surface portion 11 are the first to third side portions 10a and 10b. The intermediate portion is made lower than the end portion in contact with 10c, and thus the weight of the bulkhead 10 is reduced within a range in which the load transmission performance of the ribs 21 to 23 is not deteriorated.

  And regarding weight reduction, in bulk head 10 'shown in FIG. 8, a comparatively area is among the parts partitioned by peripheral wall part 12' and each rib 21 ', 22', 23 'in plate surface part 11'. An opening 11a ′ is provided in a portion that is large and has relatively little influence on the load transmission performance, thereby reducing the weight of the bulkhead 10 ′ without degrading the load transmission performance due to the ribs. Yes.

  In the above embodiment, the bulkheads 10 and 10 'are formed of resin, but a bulkhead can be formed of metal. In this case, a bead is provided on the plate surface portion instead of the rib. Will be.

  Moreover, although the above embodiment is a thing at the time of applying this invention to the side sill 1, in addition to a side sill, it can apply also to a center pillar etc., and when applied to a pillar, when the outer panel of the frame main body 2 is applied. 3 and the upper surface portions 3b and 4b and the lower surface portions 3c and 4c of the inner panel 4 are, for example, a front surface portion and a rear surface portion.

  As described above, according to the present invention, a frame structure is realized that is excellent in the side collision resistance and the torsional deformation performance of the vehicle body. Therefore, the present invention is suitably used in the field of vehicle manufacturing industry. there is a possibility.

1 Side sill (frame)
3 Outer panel (frame component)
4 Inner panel (frame component)
10, 10 ′ Bulkhead 10a First side 10b Second side 10c Third side 10d, 10e Corner 11, 11 ′ Plate surface
12, 12 'peripheral wall part 21, 21' 1st rib (1st linear reinforcement part)
22, 22 '2nd rib (2nd linear reinforcement part)
23, 23 '3rd rib (3rd linear reinforcement part)

Claims (8)

The inside of the hollow frame body formed by joining the end portions of both side surface portions with the center surface portion and a pair of side surface portions on both sides thereof facing each other, with the two frame constituent members facing each other. In addition, a bulkhead is disposed so as to traverse the inside of the frame body, and a vehicle is disposed such that a central surface portion of one of the two frame components faces the outside of the vehicle body. Frame structure for
The bulkhead includes a first side portion along a central surface portion of the one frame constituent member, a second side portion along a central surface portion of the other frame constituent member, and side surfaces of both frame constituent members. 1, having a plate surface portion surrounded by a pair of third sides connecting the ends of the second sides,
And, on the plate surface portion, the portions near the corners at both ends of the side portion from the center of the first side portion and the corner portions at both ends of the second side portion corresponding to the portion do not cross each other. Two first linear reinforcing portions to be connected, each corner portion at both ends of the first side portion, and corner portions at both ends of the second side portion located on the diagonal line of the corner portion are crossed and connected to each other. A vehicle frame structure comprising two second linear reinforcing portions.   A third linear reinforcing portion is provided on the plate surface portion of the bulkhead, and connects a portion corresponding to a joint portion between side surface portions of the frame constituent member in the pair of third side portions. Item 4. The vehicle frame structure according to Item 1.   3. The vehicle frame structure according to claim 2, wherein the third linear reinforcing portion is provided so as not to pass through an intersection of the two second linear reinforcing portions. The bulkhead is made of resin,
The said 3rd linear reinforcement part in the case where the said 1st, 2nd linear reinforcement part and the said 3rd linear reinforcement part are provided is a rib provided in the said plate | board surface part, It is characterized by the above-mentioned. The vehicle frame structure according to any one of claims 1 to 3.   The vehicle frame structure according to claim 4, wherein the rib is provided on both surfaces of the plate surface portion.   6. The vehicle frame structure according to claim 4, wherein the bulkhead includes a peripheral wall portion that is provided substantially orthogonal to the plate surface portion and surrounds the periphery of the plate surface portion.   The width dimension along the longitudinal direction of the frame main body of the peripheral wall portion is such that the portion on the second side portion is wider than the portion on the first side portion of the bulkhead. The vehicle frame structure as described in 1. The bulkhead is made of metal;
The said 3rd linear reinforcement part in the case where the said 1st, 2nd linear reinforcement part and the said 3rd linear reinforcement part are provided is a bead provided in the said plate | board surface part, It is characterized by the above-mentioned. The vehicle frame structure according to any one of claims 1 to 3.

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