WO2016013318A1

WO2016013318A1 - Joining structure

Info

Publication number: WO2016013318A1
Application number: PCT/JP2015/066668
Authority: WO
Inventors: 祐大村瀬
Original assignee: スズキ株式会社
Priority date: 2014-07-23
Filing date: 2015-06-10
Publication date: 2016-01-28
Also published as: CN105492304B; JP2016022882A; DE112015000133T5; DE112015000133B4; CN105492304A; JP6379791B2

Abstract

The present invention enables the rigidity of a bending load that acts on a T-shaped joining section to be improved. The joining structure has a second member 20 joined to a side section of the first member 10, forms a T shape, and has a first upper surface 11a and a flange 25 that are joined at a joining section 30. A long rib 15a is provided on the rear surface of the first upper surface 11a. The total length of the long rib 15a is set to at least twice the length to a joining section 30a from a contact section between the first member 10 and the second member 20. Of the angles formed between the extension directions of the long rib 15a and the longitudinal direction of the second member 20, the angle formed on the opposite side to the second member 20 is acute.

Description

Junction structure

The present invention relates to a joining structure in which two members made of a fiber reinforced resin material are joined in a T shape.

As a structure joined in a T-shape, for example, there is a structure in which members forming a skeleton of an automobile are joined. For example, the joint between the side member and the cross member has a T-shaped joint structure.
The side member is a member that extends in the vehicle front-rear direction, and the cross member is a member that extends in the vehicle width direction. As for the coupling of these members, for example, a technique disclosed in Patent Document 1 is known.

Patent Document 1 discloses that a member is provided with a beam in a direction that resists deformation to improve rigidity and strength. This technology reinforces the rocker when the input from the vehicle width direction outside to the inside acts on the middle part of the center pillar due to a side collision and the rocker coupled to the center pillar receives torsional input. It is.

On the other hand, some of these skeleton members are made of a fiber reinforced resin material for the purpose of reducing the weight of the vehicle body. These are joined by welding or the like (including adhesion, ultrasonic welding, vibration welding, etc.). The resin material has a lower specific gravity than metal materials such as iron and aluminum, but is inferior in mechanical properties. On the other hand, the fiber reinforced resin material is a material that supplements the mechanical characteristics with carbon fiber or glass fiber. Since the fiber reinforced resin material is more expensive than a general resin material, it is required to satisfy the required performance while suppressing the amount used.

JP 2011-143762 A

In a fiber reinforced resin having a property that breaks when it exceeds the load resistance after elastic deformation, if a structure such as the above example is applied, local deformation may occur in the joint and cracks may occur.

The present invention has been made in order to solve the above-mentioned problems, and its object is to provide a joint structure capable of improving the rigidity against bending load in a structure in which a member made of a fiber reinforced resin material is joined in a T shape. Is to provide.

In order to achieve the above object, the joining structure according to the present invention includes a long first member made of a fiber reinforced resin material and extending in the first direction, and a second structure made of a fiber reinforced resin material and perpendicular to the first direction. A joining structure for joining a long second member extending, the first member having a flat first main surface extending in the first direction, and extending in the first direction and perpendicular to the first main surface. The first member has an L-shaped cross-sectional shape, and the second member is adjacent to the first main surface and extends in the second direction. A main surface is provided, and on both sides of the second main surface in the first direction, there are provided vertical wall surfaces extending in the second direction and perpendicular to the second main surface, and the second member has a U-shape. A flange that abuts against the first main surface is provided at a second direction end of the second main surface, and the first main surface has a transverse cross-sectional shape. And the flange is joined at at least one joint, so that the first member and the second member have a T-shaped joint structure, and the back surface of the first main surface has at least one A long rib is provided, the long rib is disposed so as to overlap the joint, and extends in a direction away from the second member so as to pass at least the joint region of the joint. Of the angles formed by the direction in which the second member extends and the second direction, the angle formed on the side opposite to the second member is an acute angle.

Further, in one aspect of the joining structure according to the present invention, a corner portion is constituted by the side wall surface of the first member and the vertical wall surface of the second member, and the long rib starts from the corner portion, It extends in a direction away from the second member.

Further, in one aspect of the joint structure according to the present invention, each of both sides of the flange in the first direction is provided with a protruding region that protrudes in the first direction from the first direction end of the second member, Each protruding region is provided with the joint portion, and the long rib is configured to pass through the joint portion provided in the protruding region with the corner portion as a starting point.

Further, in one aspect of the joining structure according to the present invention, an inner rib is provided on the back surface of the second main surface and the vertical wall surface so as to follow the U-shaped cross-sectional shape, The first member is disposed at a position adjacent to the first member.

Further, in one aspect of the joining structure according to the present invention, the side wall surfaces of the first member are respectively provided on both sides in the second direction of the first main surface, and the second member is a U-shaped crossing. The long rib extends so as to connect the back surfaces of the side wall surfaces.

Further, in one aspect of the joining structure according to the present invention, the inner rib is an X-shaped rib in which two plate members intersect to form an X-shape, and the side wall surface of the first member and the first rib A corner portion is constituted by the vertical wall surfaces of the two members, and the X-shaped ribs are arranged so as to be adjacent to the corner portion.

Moreover, in the one aspect | mode of the joining structure which concerns on this invention, toward the said 1st member along the cross | intersection direction which cross | intersects X shape from the edge part near the said 1st member of the said X-shaped rib. The joint is disposed on the extended line when extended.

Further, in one aspect of the bonding structure according to the present invention, at least three of the bonding portions are arranged at intervals in the first direction, and the two bonding portions are respectively arranged in the protruding regions. One said junction part is arrange | positioned between each said protrusion area | region, and the long rib which passes through the said junction part arrange | positioned between each said protrusion area | region is extended along the said 2nd direction.

According to the present invention, by arranging the long ribs so as to overlap the joint where high stress is likely to occur, the stress can be dispersed and the deformation of the first member can be suppressed. By setting the angle of the long rib to be acute with respect to the second direction, against the bending load acting on the second member (bending load in the direction perpendicular to the longitudinal direction of the first member and the second member) It can work effectively. Further, by setting the length of the long rib as described above, it is possible to disperse the stress within a sufficient range with respect to the generated stress.

Bending load tends to concentrate stress on the corner of the joint between the first member and the second member. On the other hand, according to one aspect of the joint structure according to the present invention, since the long ribs are arranged so that the corners are the starting points, the stress can be effectively dispersed and the deformation is prevented. It will be possible to suppress.

Due to the bending load applied to the second member, stress concentration occurs on the first main surface of the first member around the joint on the first upper surface of the first member, and deformation occurs. On the other hand, according to one aspect of the bonding structure according to the present invention, the long ribs are disposed so as to pass over the bonding portion, whereby stress can be dispersed and deformation can be suppressed. Moreover, it can be made to function more effectively by arrange | positioning a long rib according to the direction of a load.

Also, according to one aspect of the joint structure according to the present invention, the deformation in the flange can be suppressed by increasing the rigidity in the vicinity of the joint portion of the second member on the input side and suppressing the deformation. Thereby, it is possible to more reliably transmit the load from the second member to the first member, and it is possible to reduce the stress generated in the joint portion.

Further, according to one aspect of the joining structure according to the present invention, the first member has a U-shaped cross-sectional shape, and not only the first main surface but also the back surfaces of the side wall surfaces are connected to each other. The load can be dispersed in the direction, and the generation of stress can be effectively suppressed. The first member itself is also less likely to be distorted and deformed, and deformation at the joint with the second member can be suppressed. Furthermore, by disposing the long rib in the first member in the vicinity of the corner portion, the rigidity around the corner portion of the second member can be increased, thereby suppressing the deformation of the flange of the second member, thereby increasing the rigidity. Therefore, the stress concentration can be reduced.

Moreover, according to the aspect of the joining structure according to the present invention, by providing the X-shaped rib in the second member, the rigidity against the torsion of the second member is increased, and the deformation generated in the joining portion is more reliably reduced. can do. Furthermore, it is possible to alleviate locally high stresses and deformations that occur at the joint by making the load distribution to the first member more reliable.

Moreover, according to the aspect of the joining structure according to the present invention, the stress generated by the twisting is caused by the long rib of the second member by interlocking the long rib on the first member and the X-shaped rib on the second member. It becomes possible to disperse effectively depending on the direction.

Moreover, according to the aspect of the joining structure according to the present invention, by providing the first member with the long rib extending in the second direction, the deformation strength of the first member due to the bending load can be increased, and the generation of stress can be reduced. Can be suppressed. Rigidity can be further increased by reliably dispersing the stress generated in the joint portion of the first main surface of the first member to the vertical wall.

It is a schematic perspective view which shows an example of the junction structure which concerns on this invention, and shows a part of lower structure of a vehicle body. It is a perspective view of the junction structure of a 1st embodiment concerning the present invention, and is a fragmentary perspective view which expands and shows the A section neighborhood of Drawing 1. It is the perspective view which looked at the junction structure of Drawing 1 from the vehicles lower part. It is a partial bottom view which shows the relationship between the X-shaped rib of FIG. 1, and a junction part. It is a schematic perspective view which shows 2nd Embodiment of the junction structure which concerns on this invention.

Hereinafter, embodiments of the joint structure according to the present invention will be described with reference to the drawings. The joining structure according to the present invention includes two members (a first member and a second member), and a longitudinal end of the second member is joined to a longitudinal side portion of the first member to form a T shape. Structure. In the following first and second embodiments, an example of a structure in which the cross member 20 constituting the skeleton of the vehicle body is connected to the side member 10 will be described. That is, an example in which the first member is the side member 10 and the second member is the cross member 20 will be described.

[First Embodiment] The first embodiment will be described with reference to FIGS. As shown in FIG. 1, the side member 10 of this embodiment is a member which comprises the frame | skeleton of a vehicle body, is a member which is extended in a vehicle front-back direction and is arrange | positioned at a pair in the vehicle width direction both sides. The side member 10 in this example is formed of a fiber reinforced resin material. The cross member 20 is a member constituting the skeleton of the vehicle body, like the side member 10. The cross member 20 is a member that extends in the vehicle width direction, and is joined to a side portion of the side member 10.

As described above, the resin material has a lower specific gravity than metal materials such as iron and aluminum, but is inferior in mechanical properties. The fiber-reinforced resin material is a material that compensates for inferior mechanical properties with carbon fiber or glass fiber. In this example, for example, a glass fiber such as GFRP (Glass fiber reinforced plastics) or a carbon fiber such as CFRP is used. The side member 10, the cross member 20, and the floor panel 35 are joined by bonding with an adhesive, ultrasonic welding, vibration welding, or the like.

Hereinafter, the joining structure of the side member 10 and the cross member 20 will be described.

As shown in FIG. 1, one side member 10 is a member that is disposed on the outer side in the vehicle width direction and extends in the vehicle front-rear direction. As shown in FIG. 2, the side member 10 includes a first upper wall portion 11, an inner wall portion 12, and an outer wall portion 13. A first upper surface 11 a extending horizontally is formed on the first upper wall portion 11. The inner wall portion 12 is disposed on the inner side in the vehicle width direction of the first upper wall portion 11, and an inner wall surface 12a perpendicular to the first upper surface 11a is formed. An outer wall portion 13 is provided on the outer side in the vehicle width direction of the first upper wall portion 11.

An L-shaped cross-sectional shape is formed by the first upper wall portion 11 and the inner wall portion 12. In this example, the first upper wall portion 11, the inner wall portion 12, and the outer wall portion 13 form a U-shaped cross-sectional shape that opens downward in the vehicle.

An inner back surface 12b and an outer back surface 13b are formed on the back side of the inner wall portion 12 and the outer wall portion 13, respectively. The inner back surface 12b and the outer back surface 13b are arranged so as to face each other and extend in the vehicle front-rear direction.

The cross member 20 is a member extending in the vehicle width direction, and the outer end in the vehicle width direction is connected to the first upper wall portion 11 and the inner wall portion 12 of the side member 10. Connection will be described later.

The cross member 20 has a second upper wall portion 21 and two vertical wall portions (a front vertical wall portion 22 and a rear vertical wall portion 23). A second upper surface 21 a extending horizontally is formed on the second upper wall portion 21. The front vertical wall portion 22 is disposed on the vehicle front portion of the second upper wall portion 21, and a front vertical wall surface 22a perpendicular to the second upper surface 21a is formed. The rear vertical wall portion 23 is disposed at the rear of the vehicle on the second upper wall portion 21, and a rear vertical wall surface 23a perpendicular to the second upper surface 21a is formed. The second upper wall portion 21, the front vertical wall portion 22, and the rear vertical wall portion 23 form a U-shaped cross-sectional shape that opens downward from the vehicle.

A flange 25 protruding outward in the vehicle width direction is provided at the outer end in the vehicle width direction of the second upper surface 21a. The flange 25 extends from the end of the second upper surface 21a in the vehicle width direction so as to be continuous with the second upper surface 21a, and contacts the first upper surface 11a of the side member 10. The flange 25 has a substantially rectangular shape extending in the vehicle front-rear direction. Further, the flange 25 is formed with a front projecting region 25a projecting forward of the vehicle from the front end of the second upper surface 21a, and a rear projecting region 25b projecting rearward of the vehicle from the rear end of the vehicle. The first upper surface 11a and the flange 25 are joined by three joints, that is, the first joint 30a, the second joint 30b, and the third joint 30c. These joint portions 30a to 30c are provided at intervals in the vehicle front-rear direction. The said joining is performed by adhesion | attachment with an adhesive agent, ultrasonic welding, vibration welding, etc.

The first joint portion 30a is disposed in the front projecting region 25a, and the second joint portion 30b is disposed in the rear projecting region 25b. The third joint portion 30c is disposed in a vehicle width direction outer region at the vehicle width direction end of the second upper surface 21a between the front protruding region 25a and the rear protruding region 25b.

Further, a front contact portion 22c that contacts the inner wall surface 12a of the side member 10 is provided on the outer side in the vehicle width direction of the front vertical wall portion 22. The front contact portion 22c and the inner wall surface 12a are joined. On the other hand, a rear contact portion 23 c that contacts the inner wall surface 12 a of the side member 10 is provided on the outer side in the vehicle width direction of the rear vertical wall portion 23. The rear contact portion 23c and the inner wall surface 12a are joined. The joining is performed by an adhesive, ultrasonic welding, vibration welding, or the like, similarly to the joining of the flange 25 and the first upper surface 11a. In addition, illustration of a junction part is abbreviate | omitted. Further, a lower flange is provided at the lower part of the vehicle of the side member 10 and the cross member 20, and the lower flange is welded to the floor panel 35 as described above (adhesion with an adhesive, ultrasonic welding, vibration welding, etc.). Is included.)

As shown in FIG. 2, a front corner portion 22 b is configured by the inner wall surface 12 a of the side member 10 and the front vertical wall surface 22 a of the cross member 20. Here, a front corner portion 22b is configured by the front contact portion 22c of the cross member 20 and the front vertical wall surface 22a. Similarly, a rear corner 23b is formed by the inner wall surface 12a (rear contact portion 23c) and the rear vertical wall surface 23a.
An X-shaped rib 26 described later is disposed so as to be adjacent to the front corner portion 22b and the rear corner portion 23b.

As shown in FIGS. 2 and 3, three long ribs (a first long rib 15a, a second long rib 15b, and a third long rib 15c) are disposed on the back surface of the first upper surface 11a. Yes. The first long rib 15a starts from the front corner portion 22a, passes through the first joint portion 30a, and extends outward in the vehicle width direction to the outer back surface 13b of the outer wall portion 13. The first long rib 15a is inclined forward of the vehicle as it goes outward in the vehicle width direction. The second long rib 15b extends from the rear corner portion 23b to the outer back surface 13b of the outer wall portion 13 toward the outer side in the vehicle width direction through the second joint portion 30b. The second long rib 15b is inclined rearward of the vehicle as it goes outward in the vehicle width direction. The third long rib 15c extends in the vehicle width direction to the outer back surface 13b of the outer wall portion 13 through the third joint portion 30c. In addition, illustration of the floor panel 35 is abbreviate | omitted in FIG.

In this example, the 1st long rib 15a is extended so that the inner back 12b and the outer back 13b of the side member 10 may be connected. Similarly to the first long rib 15a, the second long rib 15b and the third long rib 15c extend so as to connect the inner back surface 12b and the outer back surface 13b of the side member 10.

The first long rib 15a and the second long rib 15b extend in the direction away from the third long rib 15c extending in the vehicle width direction (opening direction). The first long rib 15a, the second long rib 15b, and the second long rib 15b The three long ribs 15c are arranged radially when viewed from above the vehicle.

Of the angles formed by the direction in which the first long rib 15a extends and the vehicle width direction, the angle formed on the outer side in the vehicle width direction is preferably an acute angle. This angle is indicated by an angle α in FIG. In this example, the angle α is set to about 65 degrees. The same angle is preferable for the second long rib 15b.

The long ribs 15a to 15c extend so as to cross over the joint regions of the joints 30a to 30c. That is, the length in the longitudinal direction (full length) of each of the long ribs 15a to 15c is longer than the maximum length of the joining region (the diameter of the region indicated by a broken line in FIG. 2 and the like). In this example, the total length of each of the long ribs 15a to 15c is the distance from the portion (contact surface) where the side member 10 and the cross member 20 are in contact with each joint 30a to 30c (the distance (d in FIG. 5 (d )), The length is set twice or more. The overall length of the first long rib 15a is set to be twice or more the distance (d) between the first joint portion 30a and the inner wall surface 12a. Or the said full length is set to 2 times or more of the distance (d) of the 1st junction part 30a and the front contact part 22c.

Similarly, the total length of the second long rib 15b is set to be twice or more the distance (d) between the second joint portion 30b and the inner wall surface 12a. Or the said full length is set to 2 times or more of the distance (d) of the 2nd junction part 30b and the back contact part 23c. Furthermore, the overall length of the third long rib 15c is set to be twice or more the distance (d) between the third joint portion 30c and the outer end in the vehicle width direction of the second upper surface 21a. Or the said full length is set to 2 times or more of the distance of the 3rd junction part 30c and the inner wall surface 12a.

An X-shaped rib 26 is provided on the back surface of the second upper surface 21 a of the cross member 20.
The X-shaped rib 26 forms an X-shape when viewed from above the vehicle by intersecting two plates. The X-shaped rib 26 is disposed in the vicinity of the joint where the cross member 20 is joined to the side member 10. The X-shaped rib 26 is disposed adjacent to the front corner 22b and the rear corner 23b.

As shown in FIG. 4, on the extension line when extending in the longitudinal direction (cross direction) of the plate material constituting the X-shaped rib 26 from the end portion of the X-shaped rib 26 close to the side member 10, The 1st junction part 30a and the 2nd junction part 30b are arrange | positioned. The extension line is a line extending in the direction of opening outward in the vehicle width direction (downward in FIG. 4) when the X-shaped rib 26 is viewed from above the vehicle, as indicated by a one-dot chain line X in FIG.

As shown in FIG. 4, the first joint portion 30 a is disposed on an extension line that extends the end of the X-shaped rib on the right side (front side in the vehicle width direction) in FIG. 4. A second joint 30b is disposed on an extension line extending from the left end (the rear side of the vehicle and the outside in the vehicle width direction) of the X-shaped rib in FIG.

By configuring the joint structure as described above, the long ribs 15a to 15c are arranged so as to overlap the joints 30a to 30c where high stress is likely to occur, so that the stress can be dispersed, and the side member 10 deformation can be suppressed. By installing the first long rib 15a and the second long rib 15b at an acute angle with respect to the vehicle width direction, the bending load acting on the cross member 20 (particularly the bending load in the vehicle vertical direction) can be reduced. It can act effectively against. Further, by setting the total length of each of the long ribs 15a to 15c as in the present embodiment, it is possible to disperse the stress within a sufficient range with respect to the generated stress.

Bending load tends to concentrate stress on the

corners

22b and 22c of the joint between the side member 10 and the cross member 20. On the other hand, according to the present embodiment, the first long rib 15a and the second long rib 15b are arranged so that the

corner portions

22b and 23b are the starting points, so that the stress is effectively dispersed. And the deformation can be suppressed.

The bending load applied to the cross member 20 causes the first upper surface 11a of the side member 10 to be deformed due to stress concentration on the first upper surface 11a of the side member 10 around the joint portions 30a to 30c. On the other hand, according to the present embodiment, the long ribs 15a to 15c are arranged so as to pass over the joint portions 30a to 30c, whereby stress can be dispersed and deformation can be suppressed. Further, by arranging the long ribs 15a to 15c in accordance with the direction of the load, it can function more effectively.

Further, according to the present embodiment, the cross member 20 is provided with the X-shaped ribs 26 and the like, so that the rigidity in the vicinity of the joint portion of the cross member 20 on the input side is increased and the deformation is suppressed. Deformation can be suppressed. Thereby, the transmission of the load from the cross member 20 to the side member 10 can be more reliably performed, and the stress generated in the joint portion can be reduced.

In addition, according to the present embodiment, the side member 10 has a U-shaped cross-sectional shape, and not only the first upper surface 11a but also the back surfaces 12b and 13b of the side wall surfaces are connected to each other, thereby loading in the vehicle width direction. And the generation of stress can be effectively suppressed. The side member 10 itself is also less likely to be distorted and deformed, and deformation at the joint with the cross member 20 can be suppressed. Furthermore, by disposing the

long ribs

15a and 15b in the vicinity of the

corner portions

22a and 22b, the rigidity around the corner portion of the cross member 20 can be increased, and thereby deformation of the flange 25 of the cross member 20 can be suppressed. Increases the stress concentration.

Further, by providing the X-shaped ribs 26 in the cross member 20, it is possible to increase the rigidity of the cross member 20 with respect to torsion and bending, and to more reliably reduce the deformation generated in the joint portion. Furthermore, by making the distribution of the load to the side member 10 more reliable, it becomes possible to relieve locally high stress and deformation generated in the joint portion 30.

Further, by interlocking the

long ribs

15a, 15b on the side member 10 and the X-shaped ribs 26 on the cross member 20, the stress generated by twisting or bending is caused by the longitudinal direction (vehicle width direction) of the cross member 20. It becomes possible to disperse effectively.

Further, according to the present embodiment, by providing the side member 10 with the third long rib 15c extending in the vehicle width direction, the deformation strength of the side member 10 due to the bending load can be increased, and the generation of stress can be suppressed. it can. Rigidity can be increased by reliably dispersing the stress generated at the joint of the first upper surface 11a to the vertical wall.

[Second Embodiment] The second embodiment will be described with reference to FIG. The present embodiment is a modification of the first embodiment (FIGS. 1 to 4), and the same or similar parts as in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. .

In the present embodiment, as shown in FIG. 5, a U-shaped rib 29 is provided inside the cross member 20. The U-shaped rib 29 is composed of a rectangular plate attached to the back surfaces of the second upper surface 21a, the front vertical wall surface 22a, and the rear vertical wall surface 23a.
The U-shaped rib 29 may be disposed in the vicinity of the joint portion, similarly to the X-shaped rib 26.

According to the present embodiment, similarly to the provision of the X-shaped ribs 26, by providing the cross member 20 with the U-shaped ribs 29 and the like, the rigidity in the vicinity of the joint portion of the cross member 20 on the input side is increased. By suppressing the deformation, the deformation generated in the flange 25 can be suppressed. Thereby, the transmission of the load from the cross member 20 to the side member 10 can be more reliably performed, and the stress generated in the joint portion can be reduced.

[Other Embodiments] The above-described embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

In the first and second embodiments, the first long rib 15a is inclined forward of the vehicle, but is not limited thereto. The vehicle may be tilted backward. Also in this case, the angle formed on the outer side in the vehicle width direction among the angles formed by the vehicle width direction, the longitudinal direction of the first long rib 15a, and the vehicle width direction may be 65 degrees or less. Similarly, the second long rib 15b may be inclined forward of the vehicle. Further, the U-shaped rib 29 described in the second embodiment may be combined with the X-shaped rib 26 described in the first embodiment. The cross member 20 or the like has a U-shaped cross section that opens downward in the vehicle, but may be configured to open upward.

In the above embodiment, the joining of the side member 10 and the cross member 20 which are members constituting the vehicle body has been described, but the present invention is not limited to this. For example, the present invention can be applied to a structure in which a center pillar and a side sill are joined, a structure in which a front pillar and a front side member are joined, and the like. Furthermore, the joining structure according to the present invention is not limited to the members constituting the vehicle body, and can be applied to a structure in which two members are joined in a T shape.

10 Side member (first member)
11 1st upper wall part 11a 1st upper surface 12 inner wall part 12a inner wall surface 12b inner back surface 13 outer side wall part 13b outer back surface 15a first long rib 15b second long rib 15c third long rib 20 cross member (second member)
21 2nd upper wall part 21a 2nd upper surface 22 front vertical wall part 22a front vertical wall surface 22b front corner part 22c front contact part 23 back vertical wall part 23a rear vertical wall part 23b rear corner part 23c rear contact part 25 flange 25a front Protruding region 25b Rear protruding region 26 X-shaped rib 29 U-shaped rib 30a First joint 30b Second joint 30c Third joint 35 Floor panel

Claims

A joining structure in which a long first member made of a fiber reinforced resin material and extending in a first direction is joined to a long second member made of a fiber reinforced resin material and extending in a second direction perpendicular to the first direction. The first member is provided with a flat first main surface extending in the first direction and a side wall surface extending in the first direction and perpendicular to the first main surface. The second member is provided with a flat second main surface adjacent to the first main surface and extending in the second direction, the second member having the L-shaped cross section. A vertical wall surface extending in the second direction and perpendicular to the second main surface is provided on both sides in one direction, and the second member has a U-shaped cross-sectional shape, A flange in contact with the first main surface is provided at the second direction end, and the first main surface and the flange include at least one flange. In the joining structure in which the first member and the second member are formed in a T shape by joining at a joining portion, at least one long rib is provided on the back surface of the first main surface, and the long The rib is disposed so as to overlap the joint, and extends in a direction away from the second member so as to pass at least the joint region of the joint. The direction in which the long rib extends and the second Of the angles formed with the direction, an angle formed on the side opposite to the second member is configured to be an acute angle.
A corner portion is constituted by the side wall surface of the first member and the vertical wall surface of the second member, and the long rib extends from the corner portion in a direction away from the second member. The joining structure according to claim 1, wherein the joining structure is characterized in that:
Protruding regions that protrude in the first direction from the first direction end of the second member are provided on both sides of the flange in the first direction, and the joints are provided in the protruding regions. The joining structure according to claim 2, wherein the long rib is configured to pass through the joining portion provided in the projecting region starting from the corner portion.
Inner ribs are provided on the back surfaces of the second main surface and the vertical wall surface so as to follow the U-shaped cross-sectional shape, and the inner ribs are disposed at positions adjacent to the first member. The joining structure according to claim 1, wherein:
The side wall surfaces of the first member are respectively provided on both sides in the second direction of the first main surface, the second member has a U-shaped cross-sectional shape, and the long rib is the side The joining structure according to claim 1, wherein the joining structure extends so as to connect back surfaces of the wall surfaces.
The inner rib is an X-shaped rib in which two plate members intersect to form an X-shape, and a corner is formed by the side wall surface of the first member and the vertical wall surface of the second member. The joining structure according to claim 4, wherein the X-shaped rib is disposed so as to be adjacent to the corner portion.
On the extension line when extending toward the first member from the end of the X-shaped rib closer to the first member along the crossing direction intersecting the X-shape, the joint portion is The joint structure according to claim 6, wherein the joint structure is arranged.
At least three of the joints are arranged at an interval in the first direction, the two joints are arranged in the respective projecting regions, and one joint unit is arranged in each projecting region. The long rib that is disposed between and passes through the joint portion disposed between the projecting regions extends along the second direction. Joining structure as described in clause.