JP6281620B1 - Frame member - Google Patents

Abstract

A frame member composed of a CFRP member and a metal attachment member coupled to the CFRP member is provided. The frame member has a high strength against bending load while improving the coupling strength and being lightweight. A tubular member 10 made of CFRP, and a frame member 1 in which metal attachment members 20 and 30 are coupled to at least one end of the tubular member, wherein the tubular member is inserted through the attachment member. An opening and a protrusion that extends along the edge of the opening and protrudes inward of the opening. The protrusion is a first protrusion and the first protrusion with respect to the opening. A second convex portion formed on the opposite side of the first and second convex portions, the tubular member having first and second groove portions respectively corresponding to the first and second convex portions, and the first and second convex portions. Are engaged with the first and second groove portions, respectively, and the mounting member is coupled to the tubular member, and the first convex portion and the first groove portion are connected to the second convex portion and the second groove portion, respectively. The tubular member is offset toward the center in the longitudinal direction. [Selection] Figure 1

Description

  The present invention relates to a frame member composed of a CFRP tubular member and a metal attachment member coupled to the tubular member, and more particularly to a frame member capable of improving strength against bending load.

  Conventionally, CFRP members having higher strength and rigidity than steel members having the same weight have been used for aircrafts, sports cars, and the like. Since the weight can be reduced by using the CFRP member, the use of the CFRP member has been studied even in general vehicles.

  Replacing all steel members with CFRP members is difficult in terms of productivity and cost, so it will be replaced from replaceable parts, but for connecting CFRP members to other members There are challenges. For example, if the other member is made of metal, when rainwater or the like enters the connecting portion between the CFRP member and the other member, electrical conduction occurs between the carbon fiber and the metal.

  As a countermeasure against electric corrosion, for example, as disclosed in Patent Document 1, there is one in which insulation is provided by interposing an insulator at a connection portion between a CFRP pipe and an aluminum pipe. However, an aluminum pipe is inserted and connected to the CFRP pipe, and the rivet is inserted and fixed in the insertion hole provided in the connection portion, so that the CFRP pipe and the aluminum pipe are electrically connected through the rainwater or the like that has entered the insertion hole. Electric corrosion occurs.

  Also, if the fastening member is provided with an insertion hole to fasten the CFRP member to another member with the fastening member, the carbon fiber is divided by the insertion hole, so that the strength and rigidity expected of the CFRP member are exhibited. There is a risk of not being. Therefore, it is necessary to connect the CFRP member and the other member via an attachment member that can be connected to the other member without providing the insertion hole in the CFRP member.

  For example, as in Patent Document 2, a ball stud, which is a metal mounting member, is attached to an end portion of an FRP tubular member by sandwiching the tubular member from the inside and outside of the tubular member, and a socket for receiving the ball stud is another type. Some are connected by a so-called ball joint provided on the member. Since no insertion hole is provided in the tubular member, the reinforcing fibers are not cut, and the strength and rigidity of the tubular member are not impaired. Moreover, even if the tubular member is made of CFRP, electrolytic corrosion does not occur through the insertion hole.

Japanese Patent Laid-Open No. 11-123765 JP 2011-37313 A

  However, in the connection with the other member by the attachment member of Patent Document 2, it is difficult to firmly fix the member. For example, when a load acts in a direction in which the tubular member is bent via the attachment member, there is a possibility that slip occurs between the tubular member and the attachment member and the load is not sufficiently transmitted to the tubular member. Further, since the ball joint slides between the ball and the socket, the connecting portion is easily deformed, and there is a possibility that it cannot be firmly connected to other members.

  An object of the present invention is to provide a frame member composed of a CFRP member and a metal attachment member coupled to the CFRP member, which can be firmly connected to other members and has a strong coupling strength between the CFRP member and the attachment member. An object of the present invention is to provide a frame member that is improved in weight and has high strength against bending load.

  The frame member of the invention of claim 1 is a frame member in which a CFRP tubular member and a metal attachment member are coupled to at least one end of the tubular member, and the attachment member and other members are connected by a fastening member. In the frame member capable of connecting the tubular member and another member by fastening, the mounting member extends along an opening through which the tubular member is inserted and an edge of the opening. The tubular member includes a convex portion protruding inwardly, the convex portion including a first convex portion and a second convex portion formed on the opposite side of the first convex portion with respect to the opening. Has first and second groove portions respectively corresponding to the first and second convex portions, and the mounting member is engaged with the first and second convex portions respectively. The first convex portion and the first groove portion are coupled to the tubular member, and the second convex portion and the front It is characterized in that it is offset in the longitudinal center side of the tubular member relative to the second groove.

  According to the above configuration, when a load is applied in a direction in which the frame member is bent from the first convex portion side through the mounting member, the first convex portion is pressed against the first groove portion, and the engagement force becomes strong. The connection between the member and the mounting member is strengthened. Moreover, since the deformation | transformation by which a 1st groove part is extended is suppressed, the yield strength of the coupling | bonding of the tubular member and an attachment member with respect to a bending load is strengthened. Accordingly, since the frame member has a strong coupling between the tubular member and the attachment member, the strength can be increased against a bending load input through the attachment member. Furthermore, since the distance from one end of the tubular member to the first groove is increased due to the offset, the contact surface between the tubular member and the attachment member from the one end to the first groove is enlarged, and the load input to the attachment member is increased. It can be configured to be easily transmitted to the tubular member.

  A frame member according to a second aspect of the present invention is characterized in that, in the first aspect, the tubular member is formed in a curved shape, and the first groove portion is located on the curved outer side.

  According to the above configuration, when a bending load in the curved inner direction is input to the one end portion of the tubular member via the attachment member, the first convex portion is pressed against the first groove portion, and the engagement force is strengthened. Therefore, the strength can be increased with respect to the bending load input through the mounting member.

  A frame member according to a third aspect of the present invention is the frame member according to the first or second aspect, wherein the convex portion extends substantially parallel to a direction in which the second convex portion protrudes and is located on both sides of the opening. The tubular member includes third and fourth groove portions that engage with the third and fourth convex portions, and the attachment member includes the fastening member in a direction in which the second convex portion protrudes. A plurality of fastening holes are provided for insertion and connection with other members.

  According to the above configuration, the coupling of the tubular member and the mounting member is strengthened by the engagement of the third and fourth convex portions and the third and fourth groove portions, and the fastening member is bent so that the tubular member is bent via the mounting member. Since the first convex portion is pressed against the first groove and the engagement is strengthened with respect to the load input from the direction opposite to the insertion direction, the strength against the bending load input via the mounting member Can be increased.

  A frame member according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the convex portion has a curved cross section perpendicular to a direction in which the convex portion extends.

  According to the said structure, since a convex part contact | abuts to the corresponding groove part by a curved surface, stress concentration is relieve | moderated and the yield strength of a groove part improves, Therefore The coupling | bonding of a tubular member and an attachment member can be strengthened.

  A frame member according to a fifth aspect of the present invention is the frame member according to any one of the first to fourth aspects, wherein the frame member engages the convex portion with the groove portion via an insulating member, whereby the mounting member is It is characterized by being connected to a tubular member.

  According to the above configuration, since the carbon fiber on the CFRP surface is prevented from being exposed by the insulating member at the joint portion between the mounting member and the tubular member, the carbon fiber and the mounting member are not electrically connected. Damage can be prevented.

  A frame member according to a sixth aspect of the present invention is the frame member according to any one of the first to fifth aspects, wherein the frame member is connected to the roof rail of the vehicle body by the mounting member, and the other end of the frame member is a side sill. The pillars are connected to each other, and the first protrusion and the first groove are located on the outer side in the vehicle width direction.

  According to the above configuration, when a load is input to bend the tubular member inward in the vehicle width direction through the mounting member to the frame member constituting the pillar due to the load that twists and deforms the vehicle body that is generated during traveling. In addition, the torsional deformation of the vehicle body can be suppressed by functioning a frame member having high strength against bending load.

  A frame member according to a seventh aspect of the present invention is the frame member according to the sixth aspect, wherein the frame member is connected to the roof rail in a state where the one end portion of the tubular member is inclined outward in the vehicle width direction when viewed from the front. The one end portion is closed by a closing portion, and the closing portion is formed substantially parallel to the vehicle width direction.

  According to the above configuration, the tubular member closing portion is provided substantially parallel to the vehicle width direction at the upper portion of the vehicle body that is likely to twist and deform because there are more openings than the lower portion of the vehicle body. The deformation of the frame member can be suppressed and the strength against the bending load of the frame member can be increased, and the torsional deformation of the vehicle body can be suppressed by functioning the frame member.

  According to the frame member of the present invention, it is possible to provide a frame member that can be firmly connected to other members and has high strength against bending load by improving the coupling strength between the CFRP member and the mounting member.

It is a perspective view of the frame member of the present invention. It is the perspective view which looked at the 1st attachment member from the front left side. It is the perspective view which looked at the 1st attachment member from the upper left. It is the perspective view seen from the 2nd attachment member front upper left. It is the perspective view which looked at the 2nd attachment member from back upper right. It is a front view of a tubular member. It is the perspective view which looked at the upper end part of the tubular member from back upper right. It is the perspective view which looked at the tubular member from front upper left. It is a lower end part right view of a tubular member. It is the perspective view which looked at the lower end part of the tubular member from the front upper left. It is a perspective view of the upper end part of the frame member which the 1st attachment member couple | bonded with the tubular member upper end part. It is a perspective view of the vehicle body right side which applied the frame member to the center pillar of a vehicle body. It is a right view of the connection part of a frame member and a roof rail. It is the XIV-XIV sectional view taken on the line of FIG. It is a left view of the connection part of a frame member and a side sill. It is the XVI-XVI sectional view taken on the line of FIG.

  Hereinafter, modes for carrying out the present invention will be described based on examples. In the figure, arrow F indicates the front, arrow L indicates the left, and arrow U indicates the upper side.

  As shown in FIG. 1, the frame member 1 includes a CFRP tubular member 10 and a metal (for example, aluminum alloy) first attachment member 20 coupled to one end of the tubular member 10 and the other end thereof. A metal second mounting member 30 is formed by coupling. Although not shown, the tubular member 10 and the other member can be firmly connected by fastening the first and second mounting members 20 and 30 with other members and fastening members such as bolts.

Next, the first and second mounting members 20 and 30 that are mounting members will be described.
As shown in FIGS. 2 and 3, the first mounting member 20 includes an opening 21 for inserting the tubular member 10. The opening 21 is formed in a substantially rectangular shape when viewed from above, and includes a protrusion that extends along the edge of the opening 21 and protrudes, for example, about 4 to 8 mm inside the opening 21. The convex portions are a first convex portion 22 a provided on one side of the opening 21, a second convex portion 22 b provided on the opposite side of the opening 21 to the first convex portion 22 a, and the other two of the opening 21. It has the 3rd and 4th convex parts 22c and 22d provided in the edge. Both ends of the second convex portion 22b are connected to the third and fourth convex portions 22c and 22d.

  As shown in FIGS. 14 and 16, the shape of the cross section (transverse section) of the first convex portion 22 a orthogonal to the direction in which the first convex portion 22 a extends is formed in a curved shape having no corners. Similarly, the cross-sectional shape of the second to fourth convex portions 22b to 22d is also formed in a curved shape.

  As shown in FIGS. 2 and 3, the first convex portion 22 a is provided at a position offset downward (to the longitudinal direction center side of the tubular member 10 in FIG. 1) with respect to the second convex portion 22 b. The fourth convex portion 22d is provided at a position offset downward with respect to the third convex portion 22c. The first convex portion 22a is also offset downward with respect to the fourth convex portion 22d. Since the 1st convex part 22a is offset below, it can provide a large contact surface with the tubular member 10, and it is easy to transmit the bending load input into the 1st attachment member 20 to the tubular member 10. Has been.

  The first mounting member 20 is provided with a plurality of fastening holes 23a and 23b through which fastening members such as bolts can be inserted in order to connect with other members. The fastening holes 23 a and 23 b are provided in the wall portion of the first mounting member 20 on the side where the second protrusion 22 b is provided, and the third and fourth protrusions 22 c and 22 d extend along the edge of the opening 21. The fastening member is inserted substantially parallel to the direction. The mold for forming the first mounting member 20 having the above-described configuration can be configured to be easily detached from the first mounting member 20 along the insertion direction of the fastening holes 23a and 23b.

  As shown in FIGS. 4 and 5, the second mounting member 30, like the first mounting member 20, has a substantially rectangular opening 31 and fifth to fifth protruding inward of the opening 31 along the edge thereof. It has 8th convex parts 32a-32d, and the 5th convex part 32a is provided in the position offset upwards with respect to the 6th convex part 32b.

  The second mounting member 30 is provided with a plurality of fastening holes 33a to 33c through which fastening members such as bolts can be inserted in order to connect with other members. The fastening holes 33 a to 33 c are provided in the wall portion of the second mounting member 30 on the side where the fifth convex portion 32 a is provided, and the eighth convex portion 32 d is substantially parallel to the direction extending along the edge of the opening 21. Insert the fastening member. The mold for forming the second mounting member 30 having the above-described configuration can be configured to be easily detached from the second mounting member 30 along the insertion direction of the fastening holes 33a to 33c.

Next, the tubular member 10 will be described.
As shown in FIG. 6, the tubular member 10 is formed in a curved shape when viewed from the front, but can be formed by changing the shape or the like as appropriate depending on the application. The tubular member 10 is formed of a thermosetting resin base material and a CFRP made of carbon fibers disposed in the base material, so that the cross section perpendicular to the longitudinal direction is formed into a substantially rectangular tubular shape. It is about 2 mm.

  The carbon fibers are mainly disposed in the base material so as to extend over the entire length in the longitudinal direction of the tubular member 10, but intersect the carbon fibers extending in the longitudinal direction at a predetermined angle (for example, +/− 30 °). The carbon fiber extending in this manner is also included in the base material. Therefore, the tubular member 10 has high rigidity in the longitudinal direction and is difficult to break in the direction along the longitudinal direction.

  As shown in FIGS. 7 and 8, the upper end portion (tip portion) that is one end portion of the tubular member 10 is a groove portion that engages with the convex portion of the first mounting member 20 in order to couple with the first mounting member 20. Is formed. The groove portion has first to fourth groove portions 12 a to 12 d corresponding to the first to fourth convex portions 22 a to 22 d of the first mounting member 20. The first groove portion 12 a is located on the curved outer side of the curved tubular member 10.

  The first groove portion 12a is formed so that the wall thickness of the opening portion of the first groove portion 12a is about 10 to 20% larger than the wall thickness of the bottom portion of the first groove portion 12a. The 2nd-4th groove parts 12b-12d are formed similarly. Although the 1st groove part 12a and the 2nd-4th groove parts 12b-12d are not connected, it is provided so that the surrounding wall of the tubular member 10 may make one round seeing from the upper end side of the tubular member 10.

  As shown in FIGS. 9 and 10, the lower end portion (base end portion) of the tubular member 10 has fifth to eighth groove portions that engage with the fifth to eighth convex portions 32 a to 32 d of the second mounting member 30. 13a-13d are provided. Similarly to the first to fourth groove portions 12a to 12d, the fifth to eighth groove portions 13a to 13d are formed so that the wall thickness of the opening portion of the groove portion is about 10 to 20% larger than the wall thickness of the bottom portion of the groove portion.

  The 5th groove part 13a is located in the curve outer side of the tubular member 10 formed in the curve shape. The fifth groove portion 13a and the sixth to eighth groove portions 13b to 13d are not connected, but are provided so as to make one round of the peripheral wall of the tubular member 10 when viewed from the lower end side of the tubular member 10.

  Here, a method for forming the frame member 1 will be briefly described. The tubular member 10 of the frame member 1 is formed by an internal pressure forming method. In the internal pressure molding method, a tubular material is placed in a mold cavity, and a pressure bag placed inside the tubular material is inflated by air pressure or the like, and the tubular material is thermally cured in a state of being in close contact with the inner wall of the mold cavity. It is.

  First, a thermosetting resin sheet in which carbon fibers are arranged in a predetermined direction is laminated to form a tubular material having a distal end closed and a proximal end opened. A thermosetting resin sheet (insulating member) on which insulating reinforcing fibers are disposed is pasted on the uppermost layer at portions of the tubular material that come into contact with the first and second mounting members 20 and 30.

  The tubular material is placed in the mold cavity together with the first and second mounting members 20 and 30 in a state of being inserted through the opening 21 of the first mounting member 20 and the opening 31 of the second mounting member 30. Then, the pressure bag disposed inside the tubular material is expanded, and the tubular material is thermally cured in a state where the tubular material is in close contact with the inner wall of the mold cavity and the first and second mounting members 20 and 30. A tubular member 10 is obtained by thermosetting a tubular material. After thermosetting, the pressure bag is removed from the proximal end.

  As shown in FIG. 11, the frame member 1 formed in this manner has a closing portion 14 at the distal end portion of the tubular member 10, and the first to fourth groove portions 12 a to 12 d and the first to first grooves of the first mounting member 20. The four convex portions 22a to 22d are engaged via the insulating member, and the tubular member 10 and the first mounting member 20 are coupled. Although not shown, the tubular member 10 and the second attachment member 30 are coupled to the base end portion of the frame member 1 in the same manner as the distal end portion.

  The frame member 1 is applied to a center pillar of the vehicle body V, for example. Since the vehicle body V is symmetrical in the vehicle width direction, the right side of the vehicle body V will be described, and the description on the left side will be omitted. As shown in FIG. 12, the center pillar of the vehicle body V is formed by connecting the first mounting member 20 of the frame member 1 to the roof rail 50 of the vehicle body V and connecting the second mounting member 30 to the side sill 51.

  As shown in FIGS. 13 and 14, the first mounting member 20 and the roof rail 50 are fixed by fixing the roof rain 52 connected to the roof rail 50 by inserting bolts 40 or the like from the inner side toward the outer side in the vehicle width direction. They are connected via a member 53. It is also possible to configure to connect directly to the roof rail 50.

  Similarly, as shown in FIGS. 15 and 16, the second mounting member 30 is connected to the side sill 51 by inserting a bolt 41 or the like in a direction from the inner side to the outer side in the vehicle width direction. The tubular member 10 of the frame member 1 is curved so as to bulge outward in the vehicle width direction, and as shown in FIGS. 14 and 16, the upper end portion and the lower end portion of the tubular member 10 are in the vehicle width direction when viewed from the front. It is connected to the roof rail 50 and the side sill 51 in a state inclined outward.

Next, the operation and effect of the frame member 1 of the present invention will be described.
When a load is applied in a direction in which the frame member 1 is bent from the first convex portion 22a side via the first mounting member 20, the first convex portion 22a is pressed against the first groove portion 12a and the engaging force is strengthened. The connection between the tubular member 10 and the first mounting member 20 is strengthened. Even when the tubular member 10 has a curved shape, the engagement force is similarly strengthened. Moreover, since the deformation | transformation by which the 1st groove part 12a is pushed and pressed by the 1st convex part 22a is suppressed, and the 1st groove part 12a is offset below other groove parts 12b-12d, the tubular member 10 of Since the deformation in which the first groove portion 12a is stretched by the carbon fiber disposed in the extending direction of the tubular member 10 at the position of the first groove portion 12a in the longitudinal direction is suppressed, the tubular member 10 and the first attachment member 20 against the bending load. Strength of the bond is strengthened. Further, since the distance from one end of the tubular member 10 to the first groove portion 12a is increased due to the offset of the first groove portion 12a, the contact surface between the tubular member 10 and the first mounting member 20 between the one end and the first groove portion 12a. The load input to the first mounting member 20 can be easily transmitted to the tubular member 10.

  Further, in the frame member 1, the coupling between the tubular member 10 and the first mounting member 20 is strengthened by the engagement of the third and fourth convex portions 22c and 22d and the third and fourth groove portions 12c and 12d. Since the frame member 1 is in contact with the first to fourth groove portions 12a to 12d to which the first to fourth convex portions 22a to 22d correspond in a curved surface and the stress concentration is reduced, the first to fourth groove portions 12a to 12d are relaxed. Since the proof stress is improved, the coupling between the tubular member 10 and the first mounting member 20 is strengthened.

  Therefore, since the frame member 1 is strengthened in the coupling between the tubular member 10 and the first mounting member 20, the strength can be increased with respect to the bending load input through the first mounting member 20. Further, at the joint portion between the mounting member and the tubular member, the insulating member reliably prevents the carbon fiber of the tubular member 10 and the metal first mounting member 20 from contacting each other, and the carbon fiber and the first mounting member 20 are electrically connected. Since it does not do, the failure | damage of the 1st attachment member 20 by electric corrosion can be prevented. The above operations and effects are the same in the connection between the tubular member 10 and the second mounting member 30.

  In the vehicle body V in which the center pillar is constituted by the frame member 1, when a load that twists and deforms the vehicle body V due to road surface unevenness or the like occurs during normal traveling, the center pillar is moved inward in the vehicle width direction in FIG. 14. A bending load is input via the first mounting member 20 in the direction of bending, that is, the direction in which the tubular member 10 is bent. In particular, the upper side of the vehicle body V has more openings than the lower side and few members receive the load, so that the bending load input to the tubular member 10 becomes large.

  The tubular member 10 of the frame member 1 constituting the center pillar and the first and second mounting members 20 and 30 are firmly coupled, and the input bending load acts in a direction in which the engagement force becomes stronger and becomes stronger. Combined. Therefore, the input load is reliably transmitted to the tubular member 10. The tubular member 10 has high rigidity in the longitudinal direction, and has high strength against bending load. Therefore, it functions to suppress deformation with respect to the input load.

  Further, a closing portion 14 is provided at the upper end portion of the tubular member 10 substantially in parallel with the vehicle width direction, and the strength against the bending load of the frame member 1 is suppressed by suppressing the deformation of the cross-sectional shape of the tubular member 10 due to the input load. Can be further enhanced. Therefore, it is possible to suppress the torsional deformation of the vehicle body V in which the center pillar is constituted by the frame member 1. The center pillar on the left side of the vehicle body V functions similarly.

  In addition, those skilled in the art can implement the invention by adding various modifications to the embodiment without departing from the spirit of the invention, and the invention includes such modifications.

DESCRIPTION OF SYMBOLS 1 Frame member 10 Tubular member 12a-12d 1st-4th groove part 13a-13d 5th-8th groove part 14 Closure part 20 1st attachment member 21 Opening part 22a-22d 1st-4th convex part 23a, 23b Fastening hole 30 2nd attachment member 31 Opening part 32a-32d 5th-8th convex part 33a-33c Fastening hole 40, 41 Bolt (fastening member)
50 roof rail 51 side sill 52 roof rain 53 fixing member V vehicle body

Claims (7)

A CFRP tubular member and a frame member in which a metal attachment member is coupled to at least one end of the tubular member, and the attachment member and the other member are fastened by a fastening member, and the tubular member and the other member In a frame member that can be connected to
The attachment member has an opening through which the tubular member is inserted, and a convex portion that extends along the edge of the opening and protrudes inward of the opening,
The convex portion includes a first convex portion and a second convex portion formed on the opposite side of the first convex portion with respect to the opening,
The tubular member has first and second groove portions corresponding to the first and second convex portions, respectively.
The mounting member is coupled to the tubular member by engaging the first and second convex portions with the first and second groove portions, respectively, and the first convex portion and the first groove portion are connected to the second convex portion. The frame member, wherein the frame member is offset to the center side in the longitudinal direction of the tubular member with respect to the second groove portion.   The frame member according to claim 1, wherein the tubular member is formed in a curved shape, and the first groove portion is positioned on the curved outer side. The convex portion includes third and fourth convex portions that extend substantially parallel to a direction in which the second convex portion projects and are located on both sides of the opening,
The tubular member includes third and fourth groove portions that engage with the third and fourth convex portions,
The said attachment member is provided with the some fastening hole for inserting the said fastening member in the direction in which the said 2nd convex part protrudes, and connecting with another member. Frame member.   The frame member according to any one of claims 1 to 3, wherein the convex portion has a curved cross section perpendicular to a direction in which the convex portion extends.   The said frame member has the said attaching member couple | bonded with the said tubular member by engaging the said convex part with the said groove part via an insulating member, The any one of Claims 1-4 characterized by the above-mentioned. A frame member according to the above. The frame member is connected to the roof rail of the vehicle body by the mounting member and the other end of the frame member is connected to a side sill to form a pillar,
The frame member according to claim 1, wherein the first convex portion and the first groove portion are located on the outer side in the vehicle width direction. The frame member is connected to the roof rail in a state where the one end portion of the tubular member is inclined outward in the vehicle width direction when viewed from the front.
The one end of the tubular member is closed by a closure;
The frame member according to claim 6, wherein the closing portion is formed substantially parallel to the vehicle width direction.