JP2008174180A - Bonding structure for vehicle body skeleton member and bonding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bonding structure for a vehicle body skeleton member capable of bonding a first member and a second member constituting a vehicle body skeleton without using a fastening member such as a bolt. <P>SOLUTION: An insertion shaft 10 is formed at the rear end 1r of a bumper stay 1, an insertion hole 20 for closely and rotationally fitting the insertion shaft 10 is formed at the front end 2f of a front side member 2, and screws 11, 21 bonded to each other by the relative rotation of them are provided between the insertion shaft 10 and the insertion hole 20. Thereby, a fitting area of the closely fitted insertion shaft 10 and the insertion hole 20 is widely taken, and a limitation value of a shearing load and a tensile load of the bonding portion can be enhanced relative to a load F. As a result, the bonding strength of the bumper stay 1 and the front side member 2 is enhanced, and the transmission of the load between both members 1, 2 can be more certainly performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coupling structure and a coupling method for vehicle body skeleton members.

  A pair of left and right side members, which extend in the vehicle longitudinal direction and constitute a vehicle body skeleton, are disposed on both sides in the vehicle width direction at the lower part of the vehicle body. Front bumpers and rear bumpers are disposed at the front and rear ends of these side members. The bumper reinforcements are connected.

The bumper reinforcement also constitutes a vehicle body skeleton, and this bumper reinforcement is configured such that both ends in the vehicle width direction are coupled to the front end of the side member via a bumper stay (see, for example, Patent Document 1).
JP 2004-189062 A (page 6, FIG. 1)

  In the conventional side member and bumper stay coupling structure, a flange provided at the front end portion of the side member and a rear flange provided at the rear end portion of the bumper stay are butted in the front-rear direction, and both of them are bolted. The nuts are fastened and joined together.

  In this case, a plurality of the bolts and nuts are arranged at a required interval in the circumferential direction of the flange of the side member and the rear flange of the bumper stay. However, when a large load due to a collision is input to the bumper reinforcement, the collision load Is transmitted to the side member via the bumper stay, and if a load is applied to the bolt in the shearing direction, the bolt may be broken and the collision load may not be sufficiently transmitted to the side member. There is sex.

  In order to prevent this bolt from breaking, it is necessary to increase the number of bolts to be connected or increase the bolt diameter, which is disadvantageous in terms of cost. Also disadvantageous.

  Accordingly, the present invention provides a vehicle body skeleton member coupling structure capable of coupling the first member and the second member constituting the vehicle skeleton without using a fastening member such as a bolt.

  The present invention is a vehicle body skeleton member coupling structure including a first member and a second member coupled to each other, and an insertion shaft portion is formed on one of the first member and the second member. In addition, an insertion hole portion for closely rotating and fitting the insertion shaft portion is formed on the other side, and a rotation coupling portion is provided between the insertion shaft portion and the insertion hole portion to be coupled to each other by relative rotation between the two. Is the most important feature.

  According to the present invention, an insertion shaft portion formed on one of the first member or the second member and an insertion hole portion formed on the other are rotationally fitted, whereby the insertion shaft portion and the insertion hole portion are They are coupled to each other by a rotational coupling portion provided therebetween. At this time, since the insertion shaft portion and the insertion hole portion are closely fitted to each other, the coupling area between them can be increased, and the shear load or tensile force of the coupling portion can be increased with respect to the load input in the axial direction. The limit value of the load can be increased, and as a result, the coupling strength between the first member and the second member is increased, and the load transmission between these two members can be performed more reliably.

  Further, since the first member and the second member are coupled by fitting the insertion shaft portion and the insertion hole portion, there is no portion projecting in the radial direction at the coupling portion, which is advantageous in terms of space. Fastening members such as bolts and nuts are not required, and weight reduction and cost reduction can be achieved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 5 show a first embodiment of a vehicle body skeleton member coupling structure according to the present invention, FIG. 1 is an exploded perspective view showing a coupling portion of the vehicle body skeleton member, and FIG. 2 is an enlarged perspective view of portion A in FIG. FIGS. 3A and 3B are cross-sectional views of the main part illustrating the procedure for joining the vehicle body skeleton members in order from (a) to (c).

  4 is an enlarged cross-sectional view of a portion B in FIG. 3, and FIG. 5 is an enlarged cross-sectional view for explaining the operation of the coupling portion at the time of load input.

  The vehicle body skeleton member coupling structure of the present embodiment is applied to a coupling portion between a bumper stay 1 as a first member and a front side member 2 as a second member as shown in FIG.

  The bumper stay 1 is used as a front bumper in the present embodiment, and the bumper stay 1 is provided so as to protrude from the both ends in the vehicle width direction of the bumper reinforcement 3 serving as a skeleton of the front bumper, respectively. The bumper reinforcement 3 is connected to the front side member 2 through 1.

  Here, in the present invention, as shown in FIG. 2, an insertion shaft portion 10 is formed at the rear end 1r of one bumper stay 1 of the bumper stay 1 and the front side member 2 to be coupled to each other, and the other An insertion hole portion 20 is formed in the front end portion 2f of the front side member 2 so that the insertion shaft portion 10 is in close contact with the insertion shaft portion, and the insertion shaft portion 10 and the insertion hole portion 20 are rotated relative to each other. Threaded portions 11 and 21 are provided as rotationally coupled portions that are coupled to each other.

  That is, the insertion shaft portion 10 formed in the bumper stay 1 is rotationally fitted in close contact with the insertion hole portion 20 formed in the front side member 2, and the bumper stay 1 and the front side member 2 are mutually connected by this rotational fitting. Try to combine. In FIG. 1, reference numeral 4 denotes a jig for rotating the bumper stay 1.

  In this case, the screw portion 11 of the insertion shaft portion 10 is formed as a male screw, the screw portion 21 of the insertion hole portion 20 is formed as a female screw, and the male screw 11 and the female screw 21 are screwed together.

  The bumper stay 1 is formed in a cylindrical shape with an aluminum alloy or the like, and mounting holes 3a penetrating in the front-rear direction are formed at both ends in the vehicle width direction of the bumper reinforcement 3, and the bumper stay 1 is provided in the mounting holes 3a. The front end 1f is rotatably fitted and temporarily fixed.

  The front side member 2 is formed in a closed cross section having a rectangular cross section by, for example, abutting and joining an outer panel 2a and an inner panel 2b formed in a hat-shaped cross section in the vehicle width direction. Further, an end plate 22 having a predetermined thickness in which the insertion hole 20 is formed at the center is fitted and joined.

  When the bumper stay 1 is coupled to the front side member 2, the jig 4 is inserted from the front end opening of the bumper stay 1 formed in a cylindrical shape as shown in FIG. The engaging portion 4a at the tip of the bumper stay 1 is engaged with the engaging hole 1a formed in the middle portion of the bumper stay 1 and rotated, whereby the male screw portion 11 of the bumper stay 1 is turned into the female screw portion 21 of the front side member 2. Screw together.

  At this time, when the male screw portion 11 and the female screw portion 21 are completely screwed together, the jig 4 is removed, so that the front end portion 1f of the bumper stay 1 becomes the bumper reinforcement 3 as shown in FIG. It is in a state that protrudes slightly from the front.

  Next, as shown in FIG. 3 (c), the portion in which the bumper stay 1 is rotatably fitted in the mounting hole 3a is expanded in the radial direction by electromagnetic forming inside the bumper reinforcement 3, and the diameter is expanded. The bumper stay 1 is fixed to the bumper reinforcement 3 by flange-molding the front end portion 1 f of the bumper stay 1 and press-contacting it to the front surface of the bumper reinforcement 3.

  In the present embodiment, the insertion hole portion 20 is provided with a squeezing portion 30 for reducing the diameter of the insertion shaft portion 10 against a load F input in the axial direction due to a frontal collision or the like.

  As shown in FIG. 4, the ironing portion 30 is formed at the rear end portion of the female screw portion 21 formed in the insertion hole portion 20, and is continuously tapered from the female screw portion 21 so as to be gradually reduced in diameter. 31. Of course, in the present embodiment, the ironing portion 30 is formed on the end plate 22 in which the female screw portion 21 is formed.

  With the above configuration, according to the coupling structure and coupling method between the bumper stay 1 and the front side member 2 according to the present embodiment, the insertion shaft portion 10 formed in the bumper stay 1 is inserted into the insertion hole portion 20 formed in the front side member 2. By being rotationally fitted, they are coupled to each other by screw parts 11 and 21 provided between the insertion shaft part 10 and the insertion hole part 20.

  Accordingly, the insertion shaft portion 10 is deformed so as to be pushed into the insertion hole portion 20 with respect to the load F input in the axial direction, that is, the collision load F input from the bumper reinforcement 3 due to the frontal collision. The insertion shaft portion 10 and the insertion hole portion 20 are relatively moved in the axial direction while breaking the screw portions 11 and 21 that are the rotation coupling portions.

  At this time, since the insertion shaft portion 10 and the insertion hole portion 20 are closely fitted to each other, the fitting area of the both can be increased, and the shear load of the joint portion with respect to the collision load F can be reduced. The limit value of the tensile load can be increased, and as a result, the coupling strength between the bumper stay 1 and the front side member 2 can be increased, and the load transmission between these two members can be performed more reliably.

  In addition, since the bumper stay 1 and the front side member 2 are coupled by fitting the insertion shaft portion 10 and the insertion hole portion 20 in this way, it is not necessary to form a flange for coupling as in the prior art. That is, since there is no portion projecting in the radial direction in the coupling portion, it is advantageous in terms of space, and a fastening member such as a flange, a bolt and a nut is not necessary, and weight reduction and cost reduction can be achieved.

  Further, since the ironing portion 30 for reducing the diameter of the insertion shaft portion 10 with respect to the axial load F input from the front of the vehicle is provided in the insertion hole portion 20, when the collision load F is input. When the insertion shaft portion 10 is pushed into the insertion hole portion 20, the tip end portion of the insertion shaft portion 10 formed in a cylindrical shape as shown in FIG. It can absorb energy.

  That is, when the bumper stay and the front side member are coupled via a flange as in the conventional case, the front side member is crushed in the axial direction (axial collapse) in response to the input of the collision load F, thereby absorbing the collision energy. In this case, however, the front side member inevitably collapses and cannot efficiently absorb energy. However, in this embodiment, the insertion shaft portion 10 is axially moved by the squeezing portion 30 with a constant load. Since the most efficient energy absorption mode is possible and the axial length of the insertion shaft 10 can be effectively narrowed, the entire length of the insertion shaft 10 can be used evenly for energy absorption. Thus, the amount of collision energy absorbed can be increased.

  Further, since the ironing portion 30 is formed by the taper portion 31 that is gently curved and reduced in diameter, the reaction force generated in the ironing portion 30 against the collision load F can be controlled by the shape of the taper portion 31. The collision energy can be absorbed more efficiently.

  By the way, in this embodiment, since the present invention is applied to the bumper stay 1, it is necessary to temporarily fix the bumper stay 1 to the mounting hole 3 a of the bumper reinforcement 3 in order to rotationally couple the bumper stay 1. However, after the connection between the bumper stay 1 and the front side member 2 is completed, as shown in FIG. 3 (c), the portion where the bumper stay 1 is rotatably fitted in the mounting hole 3a is electromagnetically molded. Since the diameter is increased, the front end 1 f of the bumper stay 1 can be easily and firmly fixed to the bumper reinforcement 3.

  In the present embodiment, the case where the front end portion 1f of the bumper stay 1 is electromagnetically molded and fixed to the bumper reinforcement 3 is disclosed in this embodiment, but the present invention is not limited to this, and as shown in FIG. It is also possible to fix the bolt 5 to the front surface of the bumper reinforcement 3 with the flange portion 1b formed at the front end portion 1f.

  7 and 8 show a second embodiment of the present invention, in which the same components as in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 8 is an exploded perspective view showing the main part of the joint part, and FIG. 8 is a cross-sectional view of the main part of the joint part of the vehicle body skeleton member.

  As shown in FIGS. 7 and 8, the coupling structure of the vehicle body skeleton member of the present embodiment is such that the insertion hole 20A is formed in the bumper stay 1 as the first member and the front side member 2 as the second member is formed. The insertion shaft portion 10A is formed. The inside of the rear end portion 1r of the bumper stay 1 formed in a cylindrical shape is used as the insertion hole portion 20A, and a separate insertion shaft is provided outside the front end portion 2f of the front side member 2. Part 10A is fitted.

  Even in the present embodiment, screw portions 11 and 21 as rotational coupling portions are provided between the insertion shaft portion 10A and the insertion hole portion 20A, and a squeezing portion 30A is provided at the rear end portion of the insertion shaft portion 10A. is there.

  The ironing portion 30A is formed by a taper portion 31A that is gently curved and expands in diameter, and the ironing portion 30A is formed in a flange shape from the rear end portion of the insertion shaft portion 10A.

  Therefore, according to the vehicle body skeleton member coupling structure of the present embodiment, the insertion shaft portion 10A and the insertion hole portion 20A are formed in the front side member 2 in the opposite manner to the first embodiment, and the insertion hole portion 20A is formed in the bumper stay 1, but even in the present embodiment, the screw portions 11 and 21 are formed between the insertion shaft portion 10A and the insertion hole portion 20A, and the ironing portion 30A is formed. Therefore, the same operational effects as in the first embodiment can be achieved.

  In the present embodiment, the ironing portion 30A is formed by a taper portion 31A that gently curves and expands in diameter, so when the insertion hole portion 20A is pushed into the insertion shaft portion 10A by the input of the collision load F, The rear end 1r of the bumper stay 1 is expanded in diameter by the ironing portion 30A, and the same effect as that in the first embodiment is obtained.

  Incidentally, in the first embodiment, the coupling structure of the cylindrical bumper stay 1 and the front side member 2 having a rectangular cross section is shown. However, as shown in FIGS. 9 and 10, the front side member 2 is formed in a cylindrical shape. In this case, the screw portion 21 and the ironing portion 30 can be formed directly without using the end plate 22 (see FIG. 2) at the front end portion 2f, and the number of parts can be reduced.

  Further, in the first and second embodiments, the screw portions 11 and 21 are disclosed as the rotational coupling portions, but of course, the present invention is not limited to this. For example, as shown in FIGS. A pair of protrusions 12 provided at the outer peripheral radial direction and a hook-shaped recess 23 that fits the protrusions 12 to the inner periphery of the insertion hole 20 can also be configured.

  Further, as shown in FIG. 13, it is also rotationally coupled by a bowl-shaped notch 13 formed in the insertion shaft portion 10 and a pin 24 that projects from the inner periphery of the insertion hole 20 and engages the notch 13. Can be configured.

  By the way, although the coupling structure of the vehicle body skeleton member of the present invention has been described by taking the above embodiments as examples, the present invention is not limited to these embodiments, and various other embodiments can be adopted without departing from the gist of the present invention. For example, the present invention can be applied to coupling of vehicle body skeleton members other than the skeleton members of the bumper stay 1 and the front side member 2.

The disassembled perspective view which shows the coupling | bond part of the vehicle body frame member in 1st Embodiment of this invention. The expansion perspective view of the A section in FIG. The principal part sectional drawing which shows the coupling | bonding procedure of the vehicle body frame member in 1st Embodiment of this invention later on to (a)-(c). The expanded sectional view of the B section in FIG. The principal part expanded sectional view explaining the effect | action of the coupling | bond part at the time of the load input in 1st Embodiment of this invention. The principal part perspective view which shows the modification of 1st Embodiment. The disassembled perspective view which shows the principal part of the coupling | bond part of the vehicle body frame member in 2nd Embodiment of this invention. Sectional drawing of the principal part of the coupling | bond part of the vehicle body frame member in 2nd Embodiment of this invention. The disassembled perspective view which shows the coupling | bond part of the vehicle body frame member which shows the modification of 1st Embodiment. The expanded sectional view of the coupling | bond part of the vehicle body skeleton member which shows the modification of 1st Embodiment. The disassembled perspective view which shows the modification of the rotation coupling part of 1st Embodiment. The expanded perspective view of the C section in FIG. The disassembled perspective view which shows the modification of the rotation coupling part of 1st Embodiment.

Explanation of symbols

1 Bumper stay (first member)
2 Front side member (second member)
3 Bumper Reinforce 3a Bumper Stay Mounting Hole 10, 10A Insertion Shaft 11 Screw (Rotation Coupling)
12 Protrusion (rotation joint)
13 Notch (rotation joint)
20, 20A insertion hole 21 screw part (rotation coupling part)
23 Recessed part (Rotating coupling part)
24 pins (rotation coupling part)
30, 30A Ironing part 31, 31A Taper part

Claims (5)

A vehicle body skeleton member coupling structure including a first member and a second member coupled to each other,
An insertion shaft portion is formed on one of the first member and the second member, and an insertion hole portion is formed on the other side in which the insertion shaft portion is in close contact with the insertion shaft portion. A vehicle body skeleton member coupling structure, characterized in that a rotation coupling portion coupled to each other by relative rotation between the two is provided.   The ironing part which shrinks | reduces or expands the diameter of the other member with respect to the axial load input between both in one of the insertion shaft part or the insertion hole part is provided. The structure of the vehicle body skeleton member.   The coupling structure for a vehicle body skeleton member according to claim 2, wherein the ironing portion is a taper portion that is formed to be gently curved to reduce or increase the diameter of the other member.   The first member is a bumper stay that protrudes toward the rear of the vehicle by passing through both ends in the vehicle width direction of the bumper reinforcement in the front-rear direction and temporarily fixed so as to be rotatable, and the second member is the bumper stay. 4. The front side member to which is attached, and after the completion of the coupling between the bumper stay and the front side member, the front end portion of the bumper stay is electromagnetically molded and fixed to the bumper reinforcement. The vehicle body skeleton member connection structure according to claim 1.   An insertion shaft portion formed on one of the first member or the second member that is coupled to each other to form the vehicle body skeleton is brought into close contact with the insertion hole portion formed on the other of the first member or the second member. A coupling method for vehicle body skeleton members, wherein the first member and the second member are coupled to each other by rotation fitting.

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