JP6331823B2 - Junction structure - Google Patents

Description

  The present invention relates to a joining structure for joining two members made of a fiber reinforced resin material 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 an example in which a side frame (side member) and a cross member are integrally formed by casting or the like. The side frame and the cross member constitute a T shape. By providing a rib on the T-shaped part, the rigidity of the T-shaped part is improved.

JP-A-6-321138

  When the T-shaped joint portion of the side member and the cross member is formed integrally, the rigidity of the T-shaped portion can be solidified by providing a rib as disclosed in the document. 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.).

  In the example of the rib structure disclosed in the above-mentioned document, it is difficult to reinforce the joining portion of each member when the separate members are joined. In addition, it is sometimes difficult to apply the above example to improve the joining strength and rigidity when joining members formed of fiber reinforced resin materials in a T-shape not only to the skeleton member of the vehicle body. .

  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.

  The present invention has been made in order to solve the above-described problems, and the object thereof is to provide a joint structure capable of improving the rigidity against torsional 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, a vertical wall surface extending in the second direction and perpendicular to the second main surface is provided, and the second member has a U-shape. A flange having a cross-sectional shape, and a flange in contact with the first main surface is provided at a second direction end of the second main surface. In the joining structure in which the flange is joined at at least one joining portion to form a T shape with the first member and the second member, at least one length is provided on the back surface of the first main surface. A rib is provided, and the long rib extends along the first direction in a direction intersecting the second direction, and is disposed so as to overlap the joint portion, and is longer than a length in a direction away from the back surface. The length in the direction along the first direction is increased.

  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.

  In the aspect of the joining structure according to the present invention, the flange extends along the first direction, and the long rib extends on a boundary between a longitudinal end of the flange and the first main surface. Beyond that, it extends in the first direction.

  Moreover, in one aspect of the bonding structure according to the present invention, at least two of the bonding portions are arranged on the back surface at intervals in the first direction, and the long ribs overlap the bonding portions. As described above, the first direction is spaced apart.

  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 said junction part is arrange | positioned on the extended line when extended.

  According to the present invention, the long rib is provided on the first main surface so that the long rib passes through the joint and along the rotation direction of the first member, thereby suppressing stress concentration around the joint. , Deformation can be suppressed. When a predetermined load is input from the second member, a bending moment is generated in the first member. By providing the first member with long ribs substantially perpendicular to the longitudinal direction of the second member, the rigidity against the bending moment of the joint of the first member and the second member is increased, and the second member and the first member are perpendicular to each other. It is possible to improve the strength and rigidity against bending in the direction.

  Moreover, according to the 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 joint structure according to the present invention, the effect of suppressing deformation around the joint portion is improved by extending the long rib to the outside of the longitudinal end of the flange, and the contact area by the flange is increased. It is possible to reduce stress concentration. Thereby, it becomes possible to disperse the stress over a wide area, and it is possible to suppress a decrease in strength and rigidity.

  Further, according to one aspect of the joint structure according to the present invention, when there are two joint portions, it is possible to reduce the number of members by arranging the long ribs in a necessary range (part), and the material of the members Use can be suppressed.

  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.

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 inclination range of the 1st long rib of FIG. 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, an embodiment of a 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]
A 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 vehicle width direction both side. 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. Although a detailed description is omitted, an outer wall portion 13 is provided on the outer side in the vehicle width direction of the first upper wall portion 11.

  The first upper wall portion 11 and the inner wall portion 12 form an L-shaped cross-sectional shape. 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.

  The cross member 20 is a member extending in the vehicle width direction, and an 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. The flange 25 protrudes forward of the vehicle from the front end of the second upper surface 21a and protrudes rearward of the vehicle rear end. The first upper surface 11 a and the flange 25 are joined by two joining portions 30. These joint portions 30 are provided at intervals in the vehicle front-rear direction. The joining is performed by bonding with an adhesive, ultrasonic welding, vibration welding, or the like as described above.

  Further, on the outer side in the vehicle width direction of the front vertical wall portion 22 and the rear vertical wall portion 23, a contact portion 24 that contacts the inner wall surface 12a of the side member 10 is provided. The contact portion 24 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 vehicle lower part of the side member 10 and the cross member, and the lower flange is welded to the floor panel 35 as described above (adhesion with an adhesive, ultrasonic welding, vibration welding, etc.). Included.)

  As shown in FIGS. 2 and 3, two long plate-like long ribs (first long rib 15 a and second long rib 15 b) are provided on the back surface of the first upper surface 11 a. The 1st long rib 15a and the 2nd long rib 15b are extended along the longitudinal direction (vehicle front-back direction) of the side member 10, and are arrange | positioned at intervals in the vehicle front-back direction. The first long rib 15a is disposed so as to overlap the joint portion 30 on the vehicle front side, and the second long rib 15b is disposed so as to overlap the joint portion 30 on the vehicle rear side. In addition, illustration of the floor panel 35 is abbreviate | omitted in FIG.

  The vehicle longitudinal direction length is configured to be longer than the height of the first long rib 15a and the height of the second long rib 15b. Here, the height is a length in a direction away from the rear surface of the first upper surface 11a of the side member 10 to the vehicle lower side, and is a vehicle vertical direction length.

  The first long rib 15a starts from the joint 30 on the vehicle front side (upper side in FIG. 3), passes through the boundary between the vehicle front end of the flange 25 and the first upper surface 11a, and extends toward the vehicle front. Further, the second long rib 15b starts from the joint portion on the rear side of the vehicle (the lower side in FIG. 3), passes through the boundary between the rear end of the flange 25 and the first upper surface 11a, and extends toward the rear of the vehicle. .

  The first long rib 15a and the second long rib 15b are slightly inclined outward in the vehicle width direction with respect to the vehicle longitudinal direction. The 1st long rib 15a inclines in the direction (vehicle width direction outer side) which leaves | separates from the cross member 20 as it leaves | separates from the junction part 30 (as it goes to the vehicle front). Similarly to the first long rib 15a, the second long rib 15b is inclined in the direction away from the cross member 20 (outward in the vehicle width direction) as it is away from the joint portion 30 (as it goes toward the rear of the vehicle).

  When the first long rib 15a and the like are inclined, the first long rib 15a and the like may be arranged along the longitudinal direction of the side member 10. Preferably, the angle formed between the longitudinal direction of the cross member 20 (the vehicle width direction) and the longitudinal direction of the first long rib 15a, and the angle formed forward of the vehicle in the vehicle width direction is from 90 degrees (vertical) to 135 degrees. Good degree. Similarly, the angle formed between the longitudinal direction of the cross member 20 (the vehicle width direction) and the longitudinal direction of the second long rib 15b and the angle formed on the vehicle rear side in the vehicle width direction is from 90 degrees (vertical) to 135 degrees. Good degree. That is, the angle α shown in FIG. 4 is preferably about 90 degrees (α1) to about 135 degrees (α2). In addition, although illustration is abbreviate | omitted, the angle (alpha) may be about 45 degree | times so that the cross member 20 may be approached.

  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.

  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 contact portion 24 of the cross member 20 and the front vertical wall surface 22a. Similarly, a rear corner portion 23b is formed by the inner wall surface 12a (contact portion 24) and the rear vertical wall surface 23a. The X-shaped rib 26 is disposed adjacent to the front corner 22b and the rear corner 23b.

  As shown in FIG. 5, 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 closer to the side member 10, A joint 30 is disposed. The extension line is a line extending in the direction of opening outward in the vehicle width direction (downward in FIG. 5) when the X-shaped rib 26 is viewed from above the vehicle, as indicated by a one-dot chain line X in FIG. By changing the crossing angle of the X-shaped ribs 26, the load direction applied to the periphery of the joint portion of the side member 10 changes. It is preferable to change the direction in which the long ribs 15a and 15b extend from the joint portion 30 in response to the change in the load direction due to the change in the intersection angle. Furthermore, it is preferable to determine the direction (α) in which the long ribs 15 a and 15 b are extended after determining the load direction applied to the periphery of the joint portion between the cross member 20 and the side member 10.

  By configuring the joint structure as described above, the first long rib 15a and the second long rib 15b pass through the joint portion 30 and the first long rib 15a and the like are arranged along the rotation direction of the side member 10. By providing the flat surface on the back side of the upper surface 11a, it is possible to suppress the concentration of stress around the joint portion 30 and to suppress deformation. When a predetermined torsional load is input from the cross member 20, a bending moment is generated in the side member 10. By providing the side member 10 with long ribs substantially perpendicular to the longitudinal direction of the cross member 20, the rigidity with respect to the bending moment of the joint between the side member 10 and the cross member 20 is increased, and the side member 10 and the cross member 20 are perpendicular to each other It is possible to improve the strength and rigidity against bending in any direction (vehicle up-down direction).

  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.

  Further, by extending the long rib to the outside of the longitudinal end of the flange 25, the deformation around the joint portion 30 can be further suppressed, the contact area by the flange 25 can be increased, and the stress concentration can be increased. Can be relaxed. Thereby, it becomes possible to disperse the stress over a wide area, and it is possible to suppress a decrease in strength and rigidity.

  According to the present embodiment, since the first long rib 15a and the second long rib 15b are arranged in the two joint portions 30, respectively, the long rib can be arranged in a necessary range, and the member Reduction is possible, and the use of the material of the member can be suppressed.

  Further, by providing the X-shaped ribs 26 in the cross member 20, the rigidity of the cross member 20 against torsion can be increased, and the deformation generated in the joint portion can be more reliably reduced. 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 torsion is effectively controlled in the longitudinal direction (vehicle width direction) of the cross member 20. Can be dispersed.

[Second Embodiment]
A second embodiment will be described with reference to FIG. The present embodiment is a modification of the first embodiment (FIGS. 1 to 5), and the same or similar parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. .

  In the present embodiment, as shown in FIG. 6, 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 description of the above 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 1st and 2nd embodiment, although another long rib is arrange | positioned at each of the two junction parts 30, it is not restricted to this. One long rib may be configured to overlap the two joint portions 30. In this case, the length of one long rib in the vehicle front-rear direction is configured to be longer than the length of the flange 25 in the vehicle front-rear direction. Moreover, what is necessary is just to arrange | position one long rib so that it may protrude ahead and back from the vehicle longitudinal direction end of the flange 25. FIG. Moreover, although the 1st long rib 15a and the 2nd long rib 15b are each extended from the junction part 30 as a starting point, it is not restricted to this. The first long ribs 15 a and the second long ribs 15 b may extend so as to pass through the bonding regions of the bonding portions 30 and straddle the bonding portions 30.

  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 said embodiment, although the joining of the side member 10 and the cross member 20 which are the members which comprise a vehicle body was demonstrated, it is not restricted 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 First upper wall portion 11a First upper surface 12 Inner wall portion 12a Inner wall surface 13 Outer wall portion 15a First long rib 15b Second long rib 20 Cross member (second member)
21 Second upper wall portion 21a Second upper surface 22 Front vertical wall portion 22a Front vertical wall surface 22b Front corner portion 23 Back vertical wall portion 23a Back vertical wall surface 23b Rear corner portion 24 Contact portion 25 Flange 26 X-shaped rib 29 Shaped rib 30 joint 35 floor panel

Claims (6)

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. And
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, and the first member is L-shaped. Having a cross-sectional shape of
The second member is provided with a flat second main surface adjacent to the first main surface and extending in the second direction, and the second direction is provided on both sides of the second main surface in the second direction. And a vertical wall surface perpendicular to the second main surface is provided, and the second member has a U-shaped cross-sectional shape,
A flange contacting the first main surface is provided at a second direction end of the second main surface,
In the joining structure in which the first main surface and the flange are joined in at least one joining portion to form a T shape in the first member and the second member,
At least one long rib is provided on the back surface of the first main surface,
The long rib is
Extending along the first direction in a direction intersecting the second direction,
Arranged to overlap the joint,
A joining structure, wherein the length in the direction along the first direction is longer than the length in the direction away from the back surface. 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,
The joining structure according to claim 1, wherein the inner rib is disposed at a position adjacent to the first member. The inner rib is an X-shaped rib in which two plate members intersect to form an X-shape,
A corner portion is formed by the side wall surface of the first member and the vertical wall surface of the second member,
The joint structure according to claim 2 , wherein the X-shaped rib is disposed so as to be adjacent to the corner portion . The joint portion is disposed on an extension line extending from the end portion of the X-shaped rib closer to the first member along the crossing direction intersecting the X-shape toward the first member. The joint structure according to claim 3 , wherein the joint structure is formed. The flange extends along the first direction;
The said long rib is extended in the said 1st direction beyond the boundary of the longitudinal direction end of the said flange, and the said 1st main surface, The said any one of Claim 1 thru | or 4 characterized by the above-mentioned. The joining structure according to one item. At least two of the joint portions are arranged on the back surface with an interval in the first direction,
The joining structure according to any one of claims 1 to 5, wherein the long ribs are arranged at intervals in the first direction so as to overlap the joining portions. .

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