JP4472419B2 - Joint structure of frame member - Google Patents

Description

  The present invention relates to a joint structure of a frame member.

When joining frame members in a vehicle, for the purpose of improving aerodynamic characteristics and appearance quality, a step portion having a business trip surface, a pull-in surface, and a connecting surface connecting them is formed on one frame member. By joining the other frame member to the drawing surface of the frame member, the outer surfaces of the frame members are made continuous (see, for example, Patent Document 1).
JP 2003-220969 A

  With the above structure, although aerodynamic characteristics and appearance quality can be improved, it is necessary to form a step portion on one of the frames, and therefore it is necessary to prevent stress concentration occurring in the step portion. For this reason, the first corner portion formed by the business trip surface and the connecting surface and the second corner portion formed by the drawing surface and the connecting surface can be curved so as to eliminate a sudden shape change. Although it is conceivable, when the corner portion has such a curved shape, it is necessary to join the other frame member away from the stepped portion of one frame member so that the curved shape is not affected. However, if the frame members are joined apart from each other in this manner, the effect of improving the aerodynamic characteristics and improving the appearance quality is diminished, and there is a problem that the possibility of water intrusion from a separated gap portion increases. It was.

  Therefore, an object of the present invention is to provide a joint structure for frame members that can join the frame members with a gap as narrow as possible and can relieve stress concentration.

To achieve the above object, the invention according to claim 1 is directed to a side sill outer (for example, the side sill outer 60 in the embodiment) and a business trip surface (for example, the front business trip surface 93 in the embodiment) and a pull-in surface (for example, the retract in the embodiment). A step portion (for example, the front step portion 100 in the embodiment) having a connection surface (for example, the front connection surface 97 in the embodiment) that connects them, and a bracket (for example, the embodiment in the embodiment). A first corner portion (for example, the front outer corner portion 105 in the embodiment) formed by the business trip surface and the connecting surface and extending vertically . front inner side of the second corner portion (for example, the embodiment extends vertically is formed in the retracted surface and the coupling surface The Na portion 106) and is characterized by the upper portion 107) as the side radius of curvature is formed on the larger curved shape at the upper end (e.g., embodiments in the side sill outer.

The invention according to claim 2, in the invention according to claim 1, wherein the first corner portion and the second corner portion, at a position equidistant from the upper portion of the side sill outer, said first corner The radius of curvature increases from the center of the bracket toward the business trip surface, and the radius of curvature increases from the center of the second corner toward the retracting surface, and the bracket is joined to the upper end. A chamfered portion facing the first corner portion and the second corner portion is formed in a corner portion of the upper end portion on the side so as to form an arc shape when these joint surfaces are directly viewed . .

According to the invention of claim 1, a first corner formed by travel surface and the coupling surface of the side sill outer and a second corner formed by attraction surface and the coupling surface, the stress in the side sill outer The stress concentration can be effectively relieved by forming the curved shape in which the radius of curvature increases toward the upper end portion side where the concentration tends to occur .

According to the invention which concerns on Claim 2, a clearance gap can be narrowed and joined with respect to a side sill outer by letting a bracket escape the upper end part side. Therefore, the frame members can be joined with the gap as narrow as possible, and stress concentration can be reduced.
In addition, the first corner portion and the second corner portion increase the radius of curvature from the center portion toward the outside at a position equidistant from the upper end portion of the side sill outer . You can connect to one of them.
Furthermore, since the chamfered portion is formed opposite to the first corner portion and the second corner portion on the joint side to the upper end portion of the side sill outer in the bracket, the upper end portion side of the side sill outer at this chamfered portion. Interference with the second corner portion that expands as much as possible can be prevented. Therefore, the side sill outer can be securely joined to the bracket with a narrow gap.

  A joint structure of a frame member according to an embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a vehicle 11. The vehicle 11 is provided with a front door 14 and a rear door 15 at the side of a vehicle body 12, and the rear door 15 is a sliding door that slides in the vehicle longitudinal direction and opens and closes. Yes. A rear quarter window 16 is provided on the side and upper part of the vehicle body 12 and behind the closed rear door 15.

  FIG. 2 schematically shows the skeleton structure of the side portion of the vehicle body 12. A vehicle body frame is provided on the vehicle body 12 on the vehicle body front side of the opening portion 17 that is opened and closed by the front door 14 shown in FIG. The constituting front pillar 18 extends substantially vertically, and the front pillar 18 has a hollow structure with a horizontal section closed. Further, a center pillar 20 constituting a vehicle body frame extends vertically between the opening 17 and the opening 19 opened and closed by the rear door 15 shown in FIG. 1, and the center pillar 20 also has a horizontal cross section. It has a closed cross-section hollow structure. Further, a rear quarter pillar 22 constituting a vehicle body frame extends in the vertical direction between the opening 19 and the opening 21 of the rear quarter window 16 shown in FIG. 1, and the rear quarter pillar 22 also has a horizontal section. Has a hollow structure with a closed cross section. In addition, a rear pillar 23 constituting a vehicle body frame extends in the vertical direction on the rear side of the opening 21, and the rear pillar 23 also has a hollow structure with a horizontal section closed.

  The lower ends of the front pillar 18, the center pillar 20, and the rear quarter pillar 22 are joined to a side sill 25 that constitutes a vehicle body frame extending in the vehicle longitudinal direction at the lower part of the vehicle body side portion. It has a hollow structure in which a cross section orthogonal to the longitudinal direction of the vehicle body is a closed cross section.

  FIG. 3 shows a cross section orthogonal to the longitudinal direction of the vehicle body in the vicinity of the side sill 25, and is made of a steel plate constituting the inner side in the vehicle width direction of the side sill 25 below the floor panel 27 made of a steel plate arranged substantially horizontally. The side sill inner upper 28 is fixed by welding. The side sill inner upper 28 includes a plate portion 29 that is disposed substantially horizontally and is welded to the lower surface of the floor panel 27, a plate portion 30 that extends downward from the outer edge of the plate portion 29 in the vehicle width direction, A plate portion 31 extending outward in the vehicle width direction from the lower edge of the plate portion 30, a plate portion 32 extending downward from an edge in the vehicle width direction of the plate portion 31, and the plate portion 32 It has the board part 33 extended to a vehicle width direction outer side from a lower end edge part, and the flange part 34 extended slightly upwards from the edge part of the vehicle width direction outer side of this board part 33. As shown in FIG. A space 36 provided between the floor panel 27 and the side sill inner upper 28 is for opening and closing the rear door 15, and the lower surface of the floor panel 27 on the space 36 side is for sliding the rear door 15. A rail guide 37 is fixed along the longitudinal direction of the vehicle body.

  Further, a side sill inner lower 40 made of a steel plate constituting the inner side in the vehicle width direction of the side sill 25 is fixed to the plate portion 30 of the side sill inner upper 28 by welding. The side sill inner lower 40 is disposed substantially vertically and is welded to the inner side in the vehicle width direction of the plate portion 30 of the side sill inner upper 28 and extends downward from the plate portion 30, and a lower end of the plate portion 41. A plate portion 42 that extends outward from the edge in the vehicle width direction and a flange portion 43 that slightly extends downward from the edge of the plate portion 42 in the vehicle width direction outside.

  Here, a stiffener 45 made of a steel plate is fixed to the side sill inner upper 28 and the side sill inner lower 40 by welding on the inner side in the vehicle width direction. The stiffener 45 is disposed substantially horizontally and is welded to the lower surface of the plate portion 29 of the side sill inner upper 28. The plate portion 47 extends downward from the outer edge of the plate portion 46 in the vehicle width direction. A plate portion 48 extending outward in the vehicle width direction from the lower edge of the plate portion 47, and a plate portion of the side sill inner lower 40 extending slightly downward from the outer edge of the plate portion 48 in the vehicle width direction. 41 has a flange portion 49 welded to the inner side in the vehicle width direction. The stiffener 45, the plate portion 29 and the plate portion 29 of the side sill inner upper 28, and the plate portion 41 of the side sill inner lower 40 form a closed cross-section structure portion 51 having a closed cross section perpendicular to the vehicle body longitudinal direction.

Further, a side sill stiffener 53 made of a steel plate is fixed to the side sill inner upper 28 and the side sill inner lower 40 by welding on the outer side in the vehicle width direction. The side sill stiffener 53 is disposed substantially horizontally and is welded to the lower surface of the plate portion 33 of the side sill inner upper 28. The side sill stiffener 53 is below the inner edge in the vehicle width direction of the flange portion 54 and inward in the vehicle width direction. And a plate portion 56 that extends downward from the lower end edge of the plate portion 55 and is welded to the outer side in the vehicle width direction of the flange portion 43 of the side sill inner lower 40. Yes. The side sill stiffener 53, the plate portions 30 to 33 of the side sill inner upper 28, and the side sill inner lower 40 form a closed cross-section structure portion 58 having a closed cross section perpendicular to the longitudinal direction of the vehicle body.

  On the side sill inner upper 28 and the side sill stiffener 53, a side sill outer (frame member) 60 made of a steel plate constituting the outer side in the vehicle width direction of the side sill 25 is fixed by welding to the outer side in the vehicle width direction. The side sill outer 60 is welded to the outer side in the vehicle width direction of the flange portion 34 of the side sill inner upper 28 along the substantially vertical direction, and inward and downward from the lower end edge of the flange portion 61 in the vehicle width direction. A plate portion 62 extending obliquely inward, a plate portion 63 extending downward from an inner edge in the vehicle width direction of the plate portion 62, and inward and downward in the vehicle width direction from a lower end edge of the plate portion 63. And a flange portion 65 that slightly extends downward from the inner edge of the plate portion 64 in the vehicle width direction and is welded to the outer side of the plate portion 56 of the side sill stiffener 53 in the vehicle width direction. And have. The side sill outer 60, the plate portion 33 of the side sill inner upper 28, the flange portion 34, and the side sill stiffener 53 form a closed cross-section structure portion 67 whose cross section orthogonal to the longitudinal direction of the vehicle body is closed.

  A separate bracket (frame member) 70 made of a steel plate is fixed to the outside of the side sill outer 60 in the vehicle width direction by welding. The bracket 70 is disposed substantially along the vertical direction and is welded to the outer side in the vehicle width direction of the flange portion 61 of the side sill outer 60, and inward in the vehicle width direction and downward from the lower end edge of the flange portion 71. A plate portion 72 extending diagonally, a plate portion 73 extending downward from the inner edge of the plate portion 72 in the vehicle width direction, and extending inward in the vehicle width direction from the lower end edge portion of the plate portion 73. And a flange portion 75 that slightly extends downward from the inner edge in the vehicle width direction of the plate portion 74 and is welded to the outer side in the vehicle width direction of the flange portion 65 of the side sill outer 60. Yes. The side sill outer 60 and the bracket 70 form a closed cross-section structure portion 77 having a cross section orthogonal to the longitudinal direction of the vehicle body.

  The bracket 70 is attached with a resin side sill garnish 80, and a plurality of attachment holes 81 are formed in the plate portion 73 along the vehicle width direction. The side sill garnish 80 is attached to the side sill 25 by fitting the resin clip 82 attached to the side sill garnish 80 into these attachment holes 81. In the plate portion 73, as shown in FIG. 4, a punching hole 83 for reducing the weight is formed between the mounting holes 81.

  Here, as shown in FIG. 4, the side sill outer 60 extends in the longitudinal direction of the vehicle body to constitute the side sill 25, and the side sill constituting portion 85 extends upward from the side sill constituting portion 85 to constitute the center pillar 20. The structure includes a component 86 and a pillar component 87 that configures the rear quarter pillar 22 by extending upward from the rear side in the vehicle longitudinal direction with respect to the pillar component 86 of the side sill component 85. The bracket 70 is attached to a range between the pillar component 86 and the pillar component 87 of the side sill component 85. A mounting hole 89 for fitting a resin clip 82 attached to the side sill garnish 80 is formed at a position where the bracket 70 of the side sill outer 60 is not provided. Further, a mounting hole 90 for fitting a resin clip 82 attached to the side sill garnish 80 is also formed in the plate portion 42 of the side sill inner lower 40 shown in FIG. That is, the front part of the side sill garnish 80 is attached to the attachment hole 89 of the side sill outer 60 with the clip 82, the rear part is attached to the attachment hole 81 of the bracket 70 with the clip 82, and the lower part is the plate of the side sill inner lower 40. It is attached to the attachment hole 90 of the part 42.

  And the junction part structure of this embodiment is applied to the junction part of the flange part 61 of the above-mentioned side sill outer 60 which is one frame member, and the flange part 71 of the bracket 70 which is the other frame member.

  A front business trip surface (business trip surface) 93 and a rear business trip surface (business trip surface) 94 that are substantially orthogonal to the vehicle width direction are provided at the front and rear portions of the side sill component 85 of the flange portion 61 of the side sill outer 60 in the vehicle longitudinal direction. Are formed in alignment in the vehicle width direction.

  Further, the intermediate portion between the front business trip surface 93 and the rear business trip surface 94 in the flange portion 61 of the side sill outer 60 has a position in the vehicle width direction relative to the front business trip surface 93 and the rear business trip surface 94 inside the vehicle body. A pull-in surface 95 is formed that is slightly shifted in the direction substantially perpendicular to the vehicle width direction.

  In addition, a front connecting surface (connecting) that extends in the vertical direction so as to connect the front travel surface 93 and the retracting surface 95 of the flange portion 61 of the side sill outer 60 and is substantially orthogonal to the longitudinal direction of the vehicle body. Surface) 97 is formed, and a rear connecting surface (connecting) that extends in the vertical direction so as to connect the rear travel surface 94 and the drawing surface 95 of the flange portion 61 and is substantially orthogonal to the longitudinal direction of the vehicle body. Surface) 98 is formed.

  As described above, the front step portion (step portion) having the front business trip surface 93, the retracting surface 95 recessed inwardly of the vehicle body, and the front connecting surface 97 connecting these at the front portion of the flange portion 61 of the side sill outer 60. ) 100 is formed, and a rear stepped portion (stepped portion) 101 having a rear traveling surface 94, a retracting surface 95 recessed inward of the vehicle body, and a rear connecting surface 98 connecting them is formed at the rear portion of the flange portion 61. ing.

  The bracket 70 has a flange portion 71 joined to the outside of the vehicle body of the pull-in surface 95 described above. Here, the amount of displacement of the pull-in surface 95 of the flange portion 61 of the side sill outer 60 with respect to the front travel surface 93 and the rear business travel surface 94 is adjusted to the plate thickness of the flange portion 71 of the bracket 70, and as a result, the side sill outer The outer surface of the flange portion 61 of 60, the front business trip surface 93, and the rear business trip surface 94 are aligned in the vehicle width direction to improve aerodynamic characteristics and appearance quality.

  In the present embodiment, as shown in FIGS. 5 to 7, a front outer corner portion (first corner portion) 105 extending in the vertical direction is formed by the front business trip surface 93 and the front connection surface 97. The front inner corner portion (second corner portion) 106 formed by the pull-in surface 95 and the front connecting surface 97 and extending in the vertical direction has a shape at the center portion of the flange portion 61 of the side sill outer 60. Is formed in a curved shape having a larger radius of curvature toward the upper end (end) 107 side in the vertical direction.

  That is, the front outer corner portion 105 and the front inner corner portion 106 at the intermediate portion in the vertical direction indicated by Y3-Y3 in FIG. 6 have a small radius of curvature as shown in FIG. The front outer corner portion 105 and the front inner corner portion 106 at a slightly upper position indicated by Y2 have slightly larger radii of curvature as shown in FIG. 7B, and the upper end portion 107 indicated by Y1-Y1 in FIG. As shown in FIG. 7A, the curvature radius of the front outer corner portion 105 and the front inner corner portion 106 in the vicinity of is further increased. That is, the radius of curvature of the front outer corner portion 105 and the front inner corner portion 106 increases toward the upper end portion 107. Here, the upper end 107 side of the side sill outer 60 is a portion where the stress due to the load when the occupant is lifted and the stress due to the input from the road surface during traveling are large. In FIG. 5, the shapes of the front outer corner portion 105 and the front inner corner portion 106 at the same height position are indicated by thin lines in order to make the above shape easy to understand.

  Further, both the front outer corner portion 105 and the front inner corner portion 106 have a shape at a position equidistant in the vertical direction from the upper end portion 107 of the flange portion 61 of the side sill outer 60 as shown in FIG. The radius of curvature is increased toward the outside from the part. In other words, the radius of curvature is the smallest at the center, and the radius of curvature increases toward the outside.

  Although illustration is omitted, a rear outer corner portion (first corner portion) formed by the rear business trip surface 94 and the rear connecting surface 98, and a rear inner corner portion (first corner portion) formed by the retracting surface 95 and the rear connecting surface 98 ( Similarly, the second corner portion is formed in a curved shape in which the radius of curvature increases toward the upper end portion 107 side of the flange portion 61 of the side sill outer 60 and the upper end portion 107 of the flange portion 61. The shape at a position equidistant in the vertical direction from the center increases the radius of curvature toward the outside from the center. Here, the side sill outer 60 is formed into the shape described above from a single steel plate by press forming.

Then, the flange portion 71 of the bracket 70, the corner portion of the vehicle body front-rear direction on both sides of the junction side to become the upper end of the upper portion 107 of the flange portion 61, arcuate anterior chamfer (chamfered portion) 109 and A rear chamfer (not shown) is formed. The front chamfered portion 109 is for preventing the front inner corner portion 106 from being placed on the curved shape portion having a radius of curvature that increases toward the upper end side, and includes the front outer corner portion 105 and the front inner corner portion. It opposes 106 in the vehicle body front-back direction. The rear chamfered portion (not shown) is the same.

  According to the present embodiment described above, for example, on the front stepped portion 100 side, the front outer corner portion 105 formed by the front business trip surface 93 and the front connecting surface 97 of the side sill outer 60, and the retracting surface 95. In addition, the front inner corner portion 106 formed by the front connecting surface 97 is formed in a curved shape in which the curvature radius increases toward the upper end portion 107 side where the stress concentration in the side sill outer 60 is likely to occur, thereby effecting stress concentration. Can be relaxed. Further, since the front chamfered portion 109 having an arc shape is formed facing the front outer corner portion 105 and the front inner corner portion 106 on the joint side of the bracket 70 to the upper end portion 107 of the side sill outer 60, The front chamfered portion 109 can prevent interference with the front inner corner portion 106 that expands toward the upper end 107 side of the side sill outer 60. Therefore, the side sill outer 60 can be securely joined to the bracket 70 with a narrow gap (gap in the longitudinal direction of the vehicle body). Therefore, the side sill outer 60 and the bracket 70 can be joined with the gap as narrow as possible, and stress concentration can be reduced.

  Further, the front outer corner portion 105 and the front inner corner portion 106 increase the radius of curvature from the central portion toward the outer side at a position equidistant from the upper end portion 107 of the side sill outer 60. One of the business trip surface 93 and the drawing surface 95 can be connected to the corresponding one.

  The rear stepped portion 101 side also has the same effect.

1 is a perspective view showing a vehicle to which a frame member joint structure according to an embodiment of the present invention is applied. It is a side view showing roughly each body frame etc. of the body side part in a vehicle to which a joint structure of a frame member of one embodiment of the present invention is applied. FIG. 3 is a cross-sectional arrow view taken along line XX in FIG. 2 in the vicinity of a side sill in a vehicle to which a frame member joint structure according to an embodiment of the present invention is applied. 1 is an exploded perspective view of the vicinity of a side sill in a vehicle to which a frame member joint structure according to an embodiment of the present invention is applied. It is an expansion perspective view of the principal part of the junction part structure of the frame member of one Embodiment of this invention. It is an enlarged side view of the principal part of the junction part structure of the frame member of one Embodiment of this invention. FIG. 3 shows a joint structure of a frame member according to an embodiment of the present invention, in which (a) is a cross-sectional view taken along line Y1-Y1 in FIG. 6, (b) is a cross-sectional view taken along line Y2-Y2 in FIG. It is Y3-Y3 sectional drawing in. FIG. 7 shows a joint structure of a frame member according to an embodiment of the present invention, and is an enlarged view of a Y1-Y1 cross section in FIG. 6.

Explanation of symbols

60 Side sill outer (one frame member)
70 Bracket (the other frame member)
93 Front business trip (business trip)
95 Pull-in surface 97 Front connection surface (connection surface)
100 Front step (step)
105 Front outside corner (first corner)
106 Front inner corner (second corner)
107 Upper end (end)
109 Front chamfer (Chamfer)

Claims (2)

The side sill outer is formed with a stepped portion having a business trip surface, a pull-in surface, and a connecting surface connecting them, and a joint structure of a frame member that joins a bracket to the pull-in surface,
A first corner portion formed by the business trip surface and the connecting surface and extending vertically, and a second corner portion formed by the retracting surface and the connecting surface and extending vertically, the upper end portion side of the side sill outer A joint structure for a frame member, which is formed in a curved shape having a larger curvature radius. The first corner portion and the second corner portion are located at an equidistant position from the upper end portion of the side sill outer , and the first corner portion is moved from the central portion toward the business trip surface. In the corner part of 2, the radius of curvature is increased as it goes from the central part to the drawing surface ,
A chamfered portion that avoids the first corner portion and the second corner portion by forming an arc shape when the joint surface is viewed directly is formed at a corner portion of the upper end portion that is a joint side to the upper end portion of the bracket. joint structure according to claim 1, wherein the frame member, characterized in that it is.

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