JP5734174B2 - Auto body structure - Google Patents

Description

  The present invention forms a pair of left and right side sill portions and a floor panel fiber reinforced resin plate connecting between the side sill lower wall fiber reinforced resin plates of the pair of left and right side sill portions with a fiber reinforced resin, A first woven fabric in which continuous fibers are arranged in the longitudinal direction of the vehicle body and a direction perpendicular thereto and a second woven fabric in which the direction of the continuous fibers is inclined by 45 ° with respect to the first woven fabric are laminated and embedded in the resin. The present invention relates to a vehicle body structure.

  By inserting the outer end in the vehicle width direction of the floor panel made of CFRP (carbon fiber reinforced resin) into the interior through the opening formed at the lower end of the rocker (side sill) made of CFRP, The thing which raises an intensity | strength is well-known by the following patent document 1. FIG.

  Moreover, the metal insert which has an outer peripheral wall, a rib, and a fastening part is arrange | positioned inside the flame | frame comprised by CFRP in the closed cross section, and a frame and a to-be-fastened member are fastened by fastening a to-be-fastened member to a fastening part of a metal insert with a volt | bolt. What is integrally bonded is known from Patent Document 2 below.

JP 2010-125870 A JP 2009-255799 A

  By the way, since what was described in the said patent document 1 part of the floor panel comprises the lower part of a side sill, the lamination | stacking number of fiber reinforced resin woven fabrics and the direction of a fiber are set about each of a floor panel and a side sill. There is a problem that it cannot be set separately, and it is difficult to achieve both the rigidity of the vehicle body and the strength against collision and the weight reduction of the vehicle body.

  Moreover, since the thing described in the said patent document 2 uses the metal insert, not only the weight increases, but also it is necessary to embed the metal insert when molding the fiber reinforced resin, so the structure of the mold is complicated. There is a problem that it is difficult to ensure the positional accuracy of the metal insert as well as the reduction in the size.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve collision resistance performance while reducing the weight of a vehicle body made of fiber reinforced resin.

To achieve the above object, according to the first aspect of the present invention, a floor panel fiber reinforced resin that connects a pair of left and right side sill portions and a side sill lower wall fiber reinforced resin plate of the pair of left and right side sill portions. The fiber reinforced resin is formed of a first woven fabric in which continuous fibers are arranged in a longitudinal direction of the vehicle body and a direction perpendicular thereto, and the direction of the continuous fibers is 45 with respect to the first woven fabric. In the vehicle body structure of an automobile formed by laminating a second woven fabric inclined and embedded in a resin, a side sill lower wall fiber reinforced resin plate constituting the lower wall part of the side sill part, and the floor panel fiber reinforced resin The board includes at least two or more layers of the first woven fabric in the inner layer and at least two or more layers of the second woven fabric in the outer layer, and the first and second woven fabrics have fiber orientation with respect to the lamination center. Become symmetric Is urchin stacked, the side sill lower wall fiber reinforced resin plate the floor panel the first than the fiber-reinforced resin plate, one of the number of the second fabric is rather large, the door sill, the side sill lower Side sill outer wall fiber reinforced resin plate, side sill inner wall fiber reinforced resin plate and side sill upper wall fiber reinforced resin plate are connected to the wall fiber reinforced resin plate to form a closed cross section, and the side sill lower wall fiber reinforced resin plate and side sill outer wall fiber reinforced At least one of the resin plate, the side sill inner wall fiber reinforced resin plate, and the side sill upper wall fiber reinforced resin plate is characterized in that the number of the first woven fabric or the second woven fabric is different from the other one. A car body structure is proposed.

According to the second aspect of the present invention, the pair of left and right side sill portions and the floor panel fiber reinforced resin plate connecting the side sill lower wall fiber reinforced resin plates of the pair of left and right side sill portions are made of fiber reinforced resin. The fiber reinforced resin is molded into a first woven fabric in which continuous fibers are arranged in a vehicle longitudinal direction and a direction orthogonal thereto, and a second woven fabric in which the direction of the continuous fibers is inclined by 45 ° with respect to the first woven fabric. In a vehicle body structure in which cloth is laminated and embedded in a resin, the side sill lower wall fiber reinforced resin plate constituting the lower wall portion of the side sill portion, and the floor panel fiber reinforced resin plate are arranged in the inner layer. At least two or more layers of the first woven fabric are provided, and at least two or more layers of the second woven fabric are provided on the outer layer, and the first and second woven fabrics are laminated so that the fiber orientation is symmetric with respect to the lamination center. , The Doshiru lower wall fiber reinforced resin plate fixing a bracket having a fastening part and the floor panel fiber-reinforced resin plate of the first than, either one of the number of the second fabric is rather large, the inside of the door sill Then, a vehicle body structure is proposed in which the bracket is connected to at least the side sill outer wall fiber reinforced resin plate and the side sill inner wall fiber reinforced resin plate of the side sill portion .

According to the invention described in claim 3 , in addition to the configuration of claim 1 or claim 2 , the fiber reinforcement of the side sill lower wall fiber reinforced resin plate and the side sill upper wall fiber reinforced resin plate of the side sill portion. A vehicle body structure is proposed in which an outermost layer and an innermost layer of resin are constituted by the second woven fabric, and an inner layer thereof is constituted by the first woven fabric.

  In addition, the nut 20 of embodiment corresponds to the fastening part of this invention.

According to the configuration of claim 1 or claim 2 , the side sill lower wall fiber reinforced resin plate and the floor panel fiber reinforced resin plate constituting the lower wall portion of the side sill portion have at least two layers of the first woven fabric as an inner layer. In addition to the above, at least two or more second woven fabrics are provided on the outer layer, and the first and second woven fabrics are laminated so that the fiber orientation is symmetric with respect to the lamination center, so that they are not twisted after molding. Not only that, the side sill lower wall fiber reinforced resin plate has more of either the first or second woven fabric than the floor panel fiber reinforced resin plate, so the floor panel fiber reinforced resin plate is extended to the side sill part. As compared with the case of stacking with the lower wall of the side sill portion, the number of stacked layers can be reduced to achieve both weight reduction and vehicle performance such as collision resistance and vehicle stiffness.

In particular , according to the configuration of claim 1 , the side sill portion is configured to connect the side sill outer wall fiber reinforced resin plate, the side sill inner wall fiber reinforced resin plate, and the side sill upper wall fiber reinforced resin plate to the side sill lower wall fiber reinforced resin plate. Since at least one of the four fiber reinforced resin plates has a different number of first woven fabrics or second woven fabrics relative to the other, the strength distribution of each part of the side sill portion is arbitrarily set. Can do.

In particular , according to the configuration of the second aspect , since the bracket having the fastening portion is fixed inside the side sill portion, compared to a case where a metal insert in which a nut of another member is fixed is embedded in the fiber reinforced resin of the side sill portion. The weight can be reduced and the strength of the side sill portion can be increased without requiring special reinforcing ribs because the bracket functions as a bulkhead. Furthermore, since the bracket is connected to at least the side sill outer wall fiber reinforced resin plate and the side sill inner wall fiber reinforced resin plate of the side sill portion, the strength against side collision can be further increased.

Moreover, according to the structure of Claim 3 , the outermost layer and the innermost layer of the fiber reinforced resin of the side sill lower wall fiber reinforced resin plate and the side sill upper wall fiber reinforced resin plate of the side sill portion are configured by the second woven fabric, Since it comprised with the 1st woven fabric, the intensity | strength with respect to a front collision, a rear collision, and a side collision can be raised with the combination of a 1st, 2nd woven fabric.

The perspective view of the cabin of the automobile made of fiber reinforced resin. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a three-direction arrow view of FIG. 2. The figure which shows the lamination | stacking state of a 1st woven fabric and a 2nd woven fabric. Explanatory drawing of the manufacturing process of a side sill part.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, an automobile cabin 11 made of carbon fiber reinforced resin includes a substantially flat floor panel fiber reinforced resin plate 12 having a raised kick-up portion 12a at the rear, and floor panel fibers. Standing up from the front end of the floor panel fiber reinforced resin plate 12 so as to connect the pair of side sill portions 13 and 13 extending in the front-rear direction along the left and right side edges of the reinforced resin plate 12 and the front ends of the left and right side sill portions 13 and 13. And a rear wall 15 standing up from the rear end of the floor panel fiber reinforced resin plate 12 so as to connect between the rear ends of the left and right side sill portions 13, 13. It is formed.

  As shown in FIG. 2 and FIG. 3, the floor panel fiber reinforced resin plate 12 is composed of a single fiber reinforced resin sheet, and the side sill portion 13 is a side sill lower wall fiber reinforced each made of a fiber reinforced resin sheet. The resin plate 16, the side sill outer wall fiber reinforced resin plate 17, the side sill inner wall fiber reinforced resin plate 18, and the side sill upper wall fiber reinforced resin plate 19 are combined to form a rectangular closed cross section. Inside the side sill 13, a fiber reinforced resin bracket 21 in which two nuts 20, 20 for fixing other members are embedded is coupled. The bracket 21 may be made of metal having two screw holes.

  The side sill lower wall fiber reinforced resin plate 16 of the side sill portion 13 is an L-shaped cross-section member having a flange 16a extending upward from the outer end in the vehicle width direction. For example, a carbon fiber woven fabric laminated in six layers is embedded. Made of 6-ply fiber reinforced resin. The side sill outer wall fiber reinforced resin plate 17 of the side sill portion 13 is a member having an I-shaped cross section, and is made of, for example, a 10-ply fiber reinforced resin in which carbon fiber woven fabric laminated in 10 layers is embedded. The side sill inner wall fiber reinforced resin plate 18 of the side sill portion 13 is an L-shaped cross-section member having a flange 18a extending inward in the vehicle width direction from the lower end. For example, carbon fiber woven fabric laminated in eight layers is embedded. Made of 8-ply fiber reinforced resin. The side sill upper wall fiber reinforced resin plate 19 of the side sill portion 13 is a member having a U-shaped cross section having a pair of flanges 19a and 19b extending downward from both ends in the vehicle width direction. It consists of a 6-ply fiber reinforced resin with an embedded fabric. The floor panel fiber reinforced resin plate 12 is made of, for example, a four-ply fiber reinforced resin in which carbon fiber woven fabrics laminated in four layers are embedded.

  The bracket 21 integrally includes a bottom wall 21a, a vertical wall 21b, and a pair of side walls 21c and 21d, and a notch 21e having a reduced thickness is formed on the outer surface of the side wall 21c on the outer side in the vehicle width direction. At the same time, two nuts 20, 20 are embedded in the bottom wall 21a.

  The inner end of the side sill lower wall fiber reinforced resin plate 16 in the vehicle width direction, the flange 18b at the lower end of the side sill inner wall fiber reinforced resin plate 18, and the outer end of the floor panel fiber reinforced resin plate 12 in the vehicle width direction Are combined one after another and bonded together by using adhesives and rivets 22. The flange 16a at the outer end in the vehicle width direction of the side sill lower wall fiber reinforced resin plate 16 and the lower end portion of the side sill outer wall fiber reinforced resin plate 17 are overlapped in the vehicle width direction, and are bonded by a combination of adhesion and rivets 22. A pair of flanges 19a and 19b at both ends in the vehicle width direction of the side sill upper wall fiber reinforced resin plate 19 are overlapped in the vehicle width direction on the upper end portion of the side sill outer wall fiber reinforced resin plate 17 and the upper end portion of the side sill inner wall fiber reinforced resin plate 18. And are combined by a combination of bonding and rivets 22. As a result, the side sill portion 13 having a closed cross section is constituted by the side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17, the side sill inner wall fiber reinforced resin plate 18 and the side sill upper wall fiber reinforced resin plate 19. The floor panel fiber reinforced resin plate 12 is connected to the inside in the vehicle width direction.

  The bottom wall 21a and the pair of side walls 21c and 21d of the bracket 21 are bonded to the side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17 and the side sill inner wall fiber reinforced resin plate 18 of the side sill portion 13, respectively. The At this time, a step is generated in the side sill outer wall fiber reinforced resin plate 17 by the flange 16a of the side sill lower wall fiber reinforced resin plate 16, but interference with the flange 16a is avoided by the notch 21e formed in the side wall 21c of the bracket 21. Is done. In a state where the bracket 21 is mounted inside the side sill portion 13, the vertical wall 21 b functions as a bulkhead that partitions the inside of the side sill portion 13 back and forth. It is also possible to use a rivet at the bonding portion between the bracket 21 and the side sill portion 13.

  FIG. 4 is a schematic diagram showing the layer structure of the fiber reinforced resin of the side sill lower wall fiber reinforced resin plate 16 of the side sill portion 13, and each layer is a woven fabric obtained by plain weaving continuous fibers arranged in two orthogonal directions. Composed. In the present specification, a woven fabric in which one of the two orthogonal directions in which the continuous fibers are arranged is the vehicle body front-rear direction and the other is the direction orthogonal thereto is referred to as a first woven fabric 23. A woven fabric composed of continuous fibers inclined by 45 ° with respect to 23 continuous fibers is referred to as a second woven fabric 24. The layer structure of the fiber reinforced resin of the side sill lower wall fiber reinforced resin plate 16 of the side sill portion 13 shown in FIG. Four plies are composed of the first woven fabric 23, and the bending strength against the load from the side of the side sill portion 13 is increased.

  In addition, the floor panel fiber reinforced resin plate 12, the side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17, the side sill inner wall fiber reinforced resin plate 18, and the side sill upper wall fiber reinforced resin plate 19 are formed in the first layer on the inner layer. At least two or more layers of cloth 23 are provided, and at least two or more layers of the second woven cloth 24 are provided on the outer layer, and the fiber orientation in the stacking direction is symmetric with respect to the stacking center to prevent twisting after molding. ing.

  In this embodiment, the 6-ply side sill lower wall fiber reinforced resin plate 16 of the side sill 13, the 10 ply side sill outer wall fiber reinforced resin plate 17, the 8 ply side sill inner wall fiber reinforced resin plate 18 and the 6 ply side sill upper wall. Each of the woven fabric layer of the fiber reinforced resin plate 19 and the woven fabric layer of the four-ply floor panel fiber reinforced resin plate 12 is composed of the second woven fabric 24 of the outermost layer 2 plies. Is constituted by the first woven fabric 23. Accordingly, the side sill lower wall fiber reinforced resin plate 16 includes a 4-ply first woven fabric 23, the side sill outer wall fiber reinforced resin plate 17 includes an 8-ply first woven fabric 23, and the side sill inner wall fiber reinforced resin plate 18 includes 6 plies. The ply first woven fabric 23 is provided, the side sill upper wall fiber reinforced resin plate 19 includes a 4-ply first woven fabric 23, and the floor panel fiber reinforced resin plate 12 includes a two-ply first woven fabric 23. Become.

  FIG. 5 shows a process of assembling the side sill portion 13 and the floor panel fiber reinforced resin plate 12. First, the side sill lower wall fiber reinforced resin plate 16, the side sill inner wall fiber reinforced resin plate 18, and the floor panel fiber reinforced resin plate of the side sill portion 13. 12 (see FIG. 5A), and then the side sill outer wall fiber reinforced resin plate 17 is connected to the side sill lower wall fiber reinforced resin plate 16 of the side sill portion 13, and then the bracket 21 is inserted from the upper surface opening. The side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17 and the side sill inner wall fiber reinforced resin plate 18 (see FIG. 5B), and finally the side sill outer wall fiber reinforced resin plate 17 of the side sill portion 13. The side sill inner wall fiber reinforced resin plate 18 is bonded to the side sill inner wall fiber reinforced resin plate 19. Through the above steps, the bracket 21 can be easily fixed inside the side sill portion 13 having a closed cross section.

  As described above, according to the present embodiment, the side sill portion 13 of the cabin 11 is reinforced with the side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17, the side sill inner wall fiber reinforced resin plate 18, and the side sill upper wall fiber reinforced. Since it is divided into the resin plate 19 and the side sill portion 13 and the floor panel fiber reinforced resin plate 12 are divided, and each is made of fiber reinforced resin with different fiber orientation and number of laminated layers of carbon fiber woven fabric, strength is required. By increasing the thickness of the fiber reinforced resin in such a portion and by decreasing the thickness of the fiber reinforced resin in a portion that does not require much strength, it is possible to achieve both securing of strength and weight reduction.

  Specifically, the fiber reinforced resin of the side sill portion 13 that needs strength to withstand the frontal collision, rearward collision, or side collision of the vehicle is thickened, and is protected by the side sill portion 13 so that the floor panel fiber reinforced resin plate does not require much strength. Twelve fiber reinforced resins are thinned. Further, among the side sill portions 13, the side sill outer wall fiber reinforced resin plate 17 and the side sill inner wall fiber reinforced resin plate 18 which have a great influence on the side-crash resistance performance are less affected by the side sill lower wall fiber reinforced resin plate 16. The side sill upper wall fiber reinforced resin plate 19 is thicker than the fiber reinforced resin.

  Further, when the second woven fabric 24 having a continuous fiber orientation of 45 ° different from the first woven fabric 23 is combined, the strength of the fiber reinforced resin is increased. At this time, the second woven fabric 24 is attached to both sides of the fiber reinforced resin. When used for the outermost layer, the reinforcing effect becomes remarkable. Therefore, in the present embodiment, the outermost layers on both sides of the side sill portion 13 of the cabin 11 and all the fiber reinforced resins of the floor panel fiber reinforced resin plate 12 are constituted by the second woven fabric 24, and the other layers are the first layers. A woven fabric 23 is used.

  In particular, since the side sill lower wall fiber reinforced resin plate 16 has two more first woven fabrics 23 than the floor panel fiber reinforced resin plate 12, the floor panel fiber reinforced resin plate 12 is extended to the side sill portion 12 to be below the side sill portion 12. Compared with the case of laminating with the wall fiber reinforced resin plate 16, the number of laminated woven fabrics can be reduced to achieve both weight reduction and vehicle body performance such as collision resistance and vehicle body rigidity.

  Further, in order to fix other members to the lower surface of the side sill portion 13 with bolts, it is necessary to provide the nuts 20 and 20 on the inner surface of the side sill lower wall fiber reinforced resin plate 16 of the side sill portion 13. When embedded in the lower wall fiber reinforced resin plate 16, there is a problem that the weight increases. On the other hand, in this embodiment, since the fiber reinforced resin bracket 21 to which the nuts 20 and 20 are fixed in advance is fixed to the inner surface of the side sill portion 13, the weight is reduced compared to the case where a metal insert having a nut is used. be able to. If the bracket 21 is made of metal, a screw hole can be directly provided in the bracket 21 and a nut can be omitted.

  Since the bracket 21 is connected to the side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17 and the side sill inner wall fiber reinforced resin plate 18 of the side sill portion 13, the bracket 21 itself is used as a bulkhead of the side sill portion 13. It is possible to increase the strength of the side sill portion 13 and improve the collision resistance without adding a special reinforcing member. Moreover, since the bracket 21 can be mounted from the upper surface opening portion to which the side sill upper wall fiber reinforced resin plate 19 is attached in the process of assembling the side sill portion 13, its attachment is extremely easy.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the number of laminated layers of fiber reinforced resin woven fabrics of the side sill lower wall fiber reinforced resin plate 16, the side sill outer wall fiber reinforced resin plate 17, the side sill inner wall fiber reinforced resin plate 18, and the side sill upper wall fiber reinforced resin plate 19 The number of laminated woven fabrics of the fiber reinforced resin of the floor panel fiber reinforced resin plate 12 is not limited to the embodiment.

  Further, instead of bonding the members made of fiber reinforced resin by bonding, they may be bonded by welding, and the rivet 22 is not necessarily used together.

  The fiber reinforced resin is not limited to the carbon fiber reinforced resin.

  Moreover, although the bracket 21 of embodiment is a product made from fiber reinforced resin, it can be comprised with a metal plate material.

  Moreover, although the bracket 21 of embodiment is not connected to the side sill upper wall fiber reinforced resin plate 19, if it is connected to the side sill upper wall fiber reinforced resin plate 19, the strength of the side sill portion 13 can be further increased.

12 Floor panel fiber reinforced resin plate 13 Side sill portion 16 Side sill lower wall fiber reinforced resin plate 17 Side sill outer wall fiber reinforced resin plate 18 Side sill inner wall fiber reinforced resin plate 19 Side sill upper wall fiber reinforced resin plate 20 Nut (fastening portion)
21 Bracket 23 First woven fabric 24 Second woven fabric

Claims (3)

A pair of left and right side sill portions (13) and a floor panel fiber reinforced resin plate (12) connecting between the side sill lower wall fiber reinforced resin plates (16) of the pair of left and right side sill portions (13) are molded with fiber reinforced resin. The fiber reinforced resin includes a first woven fabric (23) in which continuous fibers are arranged in the longitudinal direction of the vehicle body and a direction perpendicular thereto, and the direction of the continuous fibers is inclined by 45 ° with respect to the first woven fabric (23). In the vehicle body structure of an automobile in which the second woven fabric (24) is laminated and embedded in a resin,
The side sill lower wall fiber reinforced resin plate (16) constituting the lower wall portion of the side sill portion (13) and the floor panel fiber reinforced resin plate (12) include at least the first woven fabric (23) as an inner layer. Provided with two or more layers, and at least two or more layers of the second woven fabric (24) on the outer layer, and the first and second woven fabrics (23, 24) are symmetrical in fiber orientation with respect to the lamination center. The side sill lower wall fiber reinforced resin plate (16) has a larger number of any one of the first and second woven fabrics (23, 24) than the floor panel fiber reinforced resin plate (12). The
The side sill portion (13) includes a side sill outer wall fiber reinforced resin plate (17), a side sill inner wall fiber reinforced resin plate (18), and a side sill upper wall fiber reinforced resin plate (19). Are connected to each other, and the side sill lower wall fiber reinforced resin plate (16), side sill outer wall fiber reinforced resin plate (17), side sill inner wall fiber reinforced resin plate (18), and side sill upper wall fiber reinforced resin plate ( At least one of 19) is different from the other in that the number of the first woven fabric (23) or the second woven fabric (24) is different . A pair of left and right side sill portions (13) and a floor panel fiber reinforced resin plate (12) connecting between the side sill lower wall fiber reinforced resin plates (16) of the pair of left and right side sill portions (13) are molded with fiber reinforced resin. The fiber reinforced resin includes a first woven fabric (23) in which continuous fibers are arranged in the longitudinal direction of the vehicle body and a direction perpendicular thereto, and the direction of the continuous fibers is inclined by 45 ° with respect to the first woven fabric (23). In the vehicle body structure of an automobile in which the second woven fabric (24) is laminated and embedded in a resin,
The side sill lower wall fiber reinforced resin plate (16) constituting the lower wall portion of the side sill portion (13) and the floor panel fiber reinforced resin plate (12) include at least the first woven fabric (23) as an inner layer. Provided with two or more layers, and at least two or more layers of the second woven fabric (24) on the outer layer, and the first and second woven fabrics (23, 24) are symmetrical in fiber orientation with respect to the lamination center. The side sill lower wall fiber reinforced resin plate (16) has a larger number of any one of the first and second woven fabrics (23, 24) than the floor panel fiber reinforced resin plate (12). The
A bracket (21) having a fastening portion (20) is fixed inside the side sill portion (13), and the bracket (21) is fixed to at least the side sill outer wall fiber reinforced resin plate (17) of the side sill portion (13) and A vehicle body structure for an automobile, wherein the vehicle body structure is connected to the side sill inner wall fiber reinforced resin plate (18) . Before SL sill said side sill lower wall fiber reinforced resin plate (13) (16) and the side sill top wall fiber reinforced resin plate wherein the outermost layer and the innermost layer of the fiber reinforced resin (19) second woven fabric (24) The vehicle body structure according to claim 1 or 2 , wherein the inner layer is made of the first woven fabric (23).

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