JP7217717B2 - Vehicle pillar structure - Google Patents

Description

The present invention relates to a vehicle pillar structure. In particular, the present invention relates to a vehicle pillar structure suitable for the second center pillar structure from the front of a vehicle such as an automobile.

Vehicles such as automobiles are provided with various pillar structures for mounting the body. A typical vehicle pillar structure is a vehicle center pillar structure. The vehicle center pillar structure is also called a vehicle B-pillar structure because it is a pillar structure arranged at the second position from the front of the vehicle.

The center pillar structure for a vehicle is arranged in a longitudinally elongated form when viewed in the vehicle height direction, and is arranged relative to the pillar outer member disposed in a position in the vehicle outward direction when viewed in the vehicle width direction. , and a pillar inner member disposed relatively at a position toward the interior of the vehicle.

The basic shape of the pillar outer member is a hat-shaped cross section orthogonal to the longitudinal direction, and flange portions welded to the flange portions of the pillar inner member, which will be described later, are formed on both sides of the pillar outer member. The pillar inner member is provided as a strength component that closes the opening side of the hat-shaped cross section of the pillar outer member, and on both sides thereof are formed flange portions that are welded to the flange portions of the pillar outer member. Then, the flange portions of the pillar outer member and the pillar inner member are welded to form a center pillar structure.

A center pillar structure for a vehicle is formed in an elongated form in which at least a part of the range in the longitudinal direction has a convex curvature shape with respect to the direction in which a side impact (side impact) load acts. Since this side impact load usually acts on the upper part of the center pillar structure, the position of the upper part of the center pillar structure for a vehicle has a convex curvature shape with respect to the direction in which the side impact load acts. That is, it is formed to have a convex curvature shape toward the outside of the vehicle.

A concave bead is formed on the top plate portion of the pillar outer member having such a convex curvature shape to increase the rigidity of the pillar outer member. The top plate portion of the pillar outer member refers to the top surface portion at the center position of the hat-shaped cross section, and by forming a concave bead shape in the top surface portion at the center position in the longitudinal direction, the rigidity in the event of a side collision is increased. It is being strengthened.

By the way, there is a risk that the welded joint between the flange portion of the pillar outer member and the pillar inner member in the vehicle center pillar structure may break (called weld breakage) because the load concentrates due to the side impact load at the time of a side collision. .

Therefore, various measures have been proposed to prevent or suppress breakage of the flange portion. For example, a configuration has been proposed in which a bent portion is provided in the side wall of the pillar outer member within 1/2 of the distance between the outer wall (top plate portion) of the pillar outer member and the flange portion (see Patent Document 1 below). As a result, in the event of a side collision, the bent portion of the side wall of the pillar outer member becomes a starting point for bending, and the entire pillar outer member bends inward in the vehicle width direction, thereby avoiding concentration of the load on the welded portion of the flange. This prevents or suppresses weld breakage.

JP 2018-094964 A

The inventor of the present invention solves the problem of preventing or suppressing weld breakage by avoiding the concentration of the side impact load on the welded portion of the flange portion, as in the conventional solution described above. I aimed to At the same time, we aimed to respond while maintaining the rigidity of the conventional center pillar structure.

Therefore, as a result of intensive studies, the inventors of the present invention have focused on the fact that the stress of the side impact load acting on the flange portion at the time of the side impact varies depending on the position of the neutral axis in the vehicle center pillar structure. In addition, the closer the neutral axis is to the flange, the smaller the stress in the flange is. Since this neutral axis is determined by the formation structure of the overall rigidity of the center pillar structure for a vehicle, attention was paid to the part where the rigidity can be changed. Since the rigidity of the center pillar structure for a vehicle changes depending on the position of the ridge line, the inventors focused on the concave bead on the top plate portion of the pillar outer member where the ridge line is formed.

The neutral axis in the vehicle center pillar structure of the present invention is the direction in which the convex shape is straightened from both ends in the longitudinal direction with respect to the long structural member which is formed in a convex curvature shape in the longitudinal direction. The following condition occurs when a bending moment is applied to When a bending moment is applied, a compressive stress is generated at the outer position of the convex shape in cross-sectional view, and a tensile stress is generated at the inner position. The boundary between this compressive stress and tensile stress is called the neutral axis. Therefore, in general center pillar structures for vehicles, the position of the flange portion where the pillar outer member and the pillar inner member are welded is usually a position where tensile stress is generated.

FIG. 11 diagrammatically shows a schematic cross section of a conventional center pillar structure 110 for a vehicle. The vehicle center pillar structure 110 is composed of the pillar outer member 112 having a hat-shaped cross section and the pillar inner member 114 closing the opening of the pillar outer member 112, as described above. Then, the flange portions 128 and 136 of both members 112 and 114 are spot-welded W to be integrally joined.

The top plate portion 124 of the conventional pillar outer member 112 shown in FIG. 11 also has a shallow recessed bead 130 formed thereon. , 142R are formed. The neutral axis N of the entire vehicle center pillar structure 110 shown in FIG. It is positioned below the position of 142R. That is, the neutral axis N is positioned between the ridgelines 142L, 142R formed on the bottom surface portion 140 of the concave bead 130 and the flange portions 128, 136 when viewed from the vertical positional relationship in FIG.

In addition, although the center pillar structure for a vehicle has been described above as an example, the same applies to other pillar structures for a vehicle.

Accordingly, the present invention has been devised in view of the above-mentioned problems, and the problem to be solved by the present invention is to improve the rigidity of the top plate portion of the pillar outer member having a convex curvature in the longitudinal direction. By using the concave bead formed for the purpose to bring the neutral axis closer to the flange part of the welded part, the tensile stress generated in the flange part of the welded part in the event of a side impact is reduced, preventing the weld from breaking at the flange part. Or to try to suppress it.

In order to solve the above problems, the vehicle pillar structure according to the present invention employs the following means.

A first aspect of the present invention is an elongated vehicle pillar structure having a convex curvature shape with respect to a direction in which a load acts on at least a part of the range in the longitudinal direction, and the vehicle pillar structure. is composed of a pillar outer member having a hat-shaped cross-sectional basic form with a cross-sectional shape perpendicular to the longitudinal direction, and a pillar inner member closing an opening side of the hat-shaped cross-sectional shape of the pillar outer member, and a flange portion of the pillar outer member The flange portion of the pillar inner member is integrally joined by welding, and the hat-shaped cross-sectional top plate portion of the pillar outer member having the convex curvature shape in the vehicle pillar structure has a concave bead in the longitudinal direction. is formed on the top plate portion of the pillar outer member, and the concave bead formed on the top plate portion of the pillar outer member has a shape in which a ridge line is formed on the bottom surface portion thereof, and the position where the ridge line is formed is the This is a vehicle pillar structure in which a neutral axis formed by the entire pillar structure is oriented inward of the vehicle.

A second invention of the present invention is the vehicle pillar structure of the first invention described above, wherein the range of the convex curvature shape in the vehicle pillar structure is an upper portion of the vehicle pillar structure. In the vehicle pillar structure, a concave bead formed on the top plate portion of the pillar outer member is also formed at the upper position.

A third aspect of the present invention is the vehicle pillar structure according to the first aspect or the second aspect, wherein the pillar outer member is formed of a high-strength steel plate.

A fourth aspect of the present invention is the vehicle pillar structure according to any one of the first to third aspects described above, wherein the bottom portion of the concave bead formed on the top plate portion of the pillar outer member and the pillar inner member are integrally joined by welding.

A fifth invention of the present invention is a vehicle pillar structure according to any one of the first invention to the fourth invention described above, wherein the concave bead formed in the top plate portion of the pillar outer member is the deepest at the central portion, and gradually decreases toward both sides.

According to the above-described means of the present invention, the concave bead formed in the top plate of the pillar outer member having a convex curvature in the longitudinal direction is used to improve the rigidity, and the neutral axis is moved to the flange portion of the welded portion. By bringing them closer together, it is possible to reduce the tensile stress generated in the flange portion of the welded portion in the event of a side collision, and to prevent or suppress weld breakage in the flange portion.

1 is a perspective view of a center pillar structure for a vehicle according to the present embodiment, viewed from the outside of the vehicle; FIG. FIG. 4 is a front view of the pillar outer member as seen from the outside of the vehicle; FIG. 3 is a side view of the pillar outer member shown in FIG. 2; FIG. 3 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIGS. 1 and 2. FIG. FIG. 3 is a cross-sectional view schematically showing a cross-section taken along line V-V in FIGS. 1 and 2. FIG. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line VI-VI in FIGS. 1 and 2; It is a sectional view showing typically a VII-VII arrow cross section in Drawing 1 and Drawing 2. It is the figure which expanded and showed the schematic cross section shown in FIG. 6 of the center pillar structure for vehicles for convenience of explanation. FIG. 10 is a schematic cross-sectional view diagrammatically showing the concave bead configuration of the second embodiment. FIG. 11 is a schematic cross-sectional view diagrammatically showing the concave bead configuration of the third embodiment. FIG. 3 is a schematic cross-sectional view diagrammatically showing a conventional center pillar structure for a vehicle.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Note that this embodiment is a case of the center pillar structure 10 for a vehicle. In addition, the direction indication shown appropriately in each figure shows the direction in the normal attitude|position state of vehicles, such as a motor vehicle. Arrow FR indicates the forward direction of the vehicle, arrow UP indicates the upward direction of the vehicle, and arrow IN indicates the inner direction in the vehicle width direction. In the following description, descriptions regarding directions are given with reference to this direction. In addition, when components exist on the left and right sides in the drawing, when referring to the left and right components individually, an L is added to the end of the reference number indicating the component, and the component on the right side Parts are indicated with an R.

<Vehicle center pillar structure 10>
FIG. 1 shows a perspective view of a vehicle center pillar structure 10 viewed from the outside of the vehicle. FIG. 2 is a front view of a pillar outer member 12 that constitutes the vehicle center pillar structure 10, viewed from the outside of the vehicle, and FIG. 3 is a side view of the pillar outer member. The vehicle center pillar structure 10 in FIG. 1 is installed on the left side of the traveling direction of a vehicle such as an automobile. As described in the background art above, a pillar structure is provided on the side of a vehicle such as an automobile as a structure for installing the vehicle body. The pillar structure includes a front pillar structure commonly called A pillar, a center pillar structure commonly known as B pillar, and a rear pillar structure commonly known as C pillar from the front of the automobile. The pillar structure of this embodiment is a vehicle center pillar structure 10 called a B pillar.

As shown in FIG. 1, the vehicle center pillar structure 10 is arranged in a long shape extending in the vertical direction of the vehicle. Since the vehicle center pillar structure 10 is a structural member that functions as a strength member in the event of a side collision (side collision) of the vehicle, it is configured to have high rigidity. For this reason, in a partial range in the longitudinal direction where the side impact load acts, it is usually formed to have a convex curvature shape with respect to the direction in which the load acts, thereby improving the rigidity.

In this embodiment, approximately the upper half range of the elongated shape shown in FIG. That is, the range A shown in FIG. 1 is the range formed in such a shape, and is formed in a curved shape protruding outward from the vehicle. This curved shape is well shown in the side view of the pillar outer member 12 shown in FIG.

Approximately the lower half of the elongated shape of the vehicle center pillar structure 10 has a linear configuration as shown in the side view of the pillar outer member 12 in FIG. This range is indicated by B in FIGS.

When viewed from the side of the vehicle, the center pillar structure 10 for a vehicle is arranged in an inclined shape such that the upper end position of the pillar outer member 12 is rearward of the vehicle, as shown in the arrangement structure of the pillar outer member 12 in FIG. is set. The vehicle center pillar structure 10 is joined to a roof side rail 18 via a substantially T-shaped mounting portion 16 formed at the upper end of the pillar outer member 12 . The pillar outer member 12 is also joined to a side sill 22 via a substantially T-shaped mounting portion 20 formed at the lower end of the pillar outer member 12 .

Next, based on FIG. 8, the basic form of the cross-sectional shape perpendicular to the longitudinal direction of the vehicle center pillar structure 10 formed in an elongated form will be described. FIG. 8 is a schematic diagram showing an enlarged schematic cross section of the vehicle center pillar structure 10 shown in FIG. As shown in FIG. 8, the center pillar structure 10 for a vehicle includes a pillar outer member 12 arranged outside when viewed in the vehicle width direction, and a pillar inner member 14 arranged inside when viewed in the vehicle width direction. consists of

<Pillar outer member 12>
The basic form of the pillar outer member 12 is formed in a hat-shaped cross-sectional shape, and when viewed in FIG. . The outer side plate portion 26 is formed so as to hang down from both ends of the top plate portion 24, and is composed of an outer side plate portion 26L on the left side and an outer side plate portion 26R on the right side as viewed in FIG. Both the left and right outer side plate portions 26L and 26R are formed to expand downward. That is, as seen in FIG. 8, it is formed in a mountain-like inclined shape.

The outer flange portion 28 extends in the left-right direction from the lower end portion of the outer side plate portion 26 and is composed of a left outer flange portion 28L and a right outer flange portion 28R. The left outer flange portion 28L is formed in connection with the lower end of the left outer side plate portion 26L, and the right outer flange portion 28R is formed in connection with the right outer side plate portion 26R.

In order to increase the rigidity of the pillar outer member 12, a high-strength steel plate is used in this embodiment. In this embodiment, the tensile strength is 980 MPa. 8, a concave bead 30 is provided at the central position of the top plate portion 24 to increase rigidity. Since this concave bead 30 is a feature of the present embodiment, it will be described in detail later.

<Pillar inner member 14>
Next, the pillar inner member 14 will be described with reference to FIG. The pillar inner member 14 is provided as a structural member that closes the opening side of the hat-shaped cross section of the pillar outer member 12 described above. By this closing, the pillar outer member 12 and the pillar inner member 14 form a closed cross-sectional configuration of the vehicle center pillar structure 10 .

The pillar inner member 14 is basically formed in an inverted hat-shaped cross-sectional shape that is opposite to the shape of the pillar outer member 12 described above. and an inner flange portion 36 . The inner side plate portion 34 is formed upward from both ends of the bottom plate portion 32, and consists of a left inner side plate portion 34L and a right inner side plate portion 34R as viewed in FIG. Both the left and right inner side plate portions 34L and 34R are formed to expand upward. That is, as seen in FIG. 8, it is formed as a saucer shape.

The inner flange portion 36 is formed by extending in the left-right direction from the upper end portion of the inner side plate portion 34, and is composed of a left inner flange portion 36L and a right inner flange portion 36R. The left inner flange portion 36L is formed in connection with the upper end of the left inner side plate portion 34L, and the right inner flange portion 36R is formed in connection with the right inner side plate portion 34R.

The pillar inner member 14 is made of a normal steel plate. In this embodiment, the tensile strength is 440 MPa. A recessed bead 38 is formed at the central position of the bottom plate portion 32 in the same manner as the pillar outer member 12 .

The outer flange portion 28 of the pillar outer member 12 and the inner flange portion 36 of the pillar inner member 14 are superimposed on each other and integrally joined by spot welding W. As shown in FIG. In FIG. 8, the spot-welded portions W are indicated by X marks, but in FIG. 1, the portions indicated by black dots are the spot-welded portions. Except for FIG. 1, welded W locations are indicated by x marks.

<Concave bead 30 of pillar outer member 12>
Next, the configuration of the concave bead 30 formed in the top plate portion 24 of the pillar outer member 12, which is the configuration that characterizes this embodiment, will be described with reference to FIG.

The depth of the concave cross-sectional shape of the concave bead 30 of this embodiment is formed as a cross-sectional concave shape deeper than the conventional general concave bead 130 shown in FIG. The depth is located below the neutral axis N of the vehicle center pillar structure 10 when viewed in the vertical direction in the illustrated state of FIG. That is, the position of the bottom portion 40 of the concave bead 30 is both flange portions where the pillar outer member 12 and the pillar inner member 14 are welded together below the position of the neutral axis N when viewed in the vertical direction in the illustrated state of FIG. 28 and 36. Incidentally, the position of the bottom portion 140 in the conventional concave bead 130 shown in FIG. In this embodiment, the bead refers to a string-like uneven shape formed on a surface.

<Ridge 42>
Ridge lines 42 are formed on both sides of the bottom portion 40 of the concave bead 30 as viewed in FIG. The edge line 42 consists of a left edge line 42L and a right edge line 42R. The ridgeline 42 is a line formed by bending and connecting two surfaces at an angle of 180 degrees or less, and such ridgeline connection can increase the rigidity of the member.

In the present embodiment, the left ridge line 42L is formed by the bending connection between the surface of the bottom surface portion 40 of the concave bead 30 and the left side surface 44L, and the right side ridge line 42L is formed by the bending connection between the surface of the bottom surface portion 40 of the concave bead 30 and the right side surface 44R. ridgeline 42R is formed. In this embodiment, both the left edge line 42L and the right edge line 42R are substantially right-angled bending connections, which greatly increases the rigidity.

Therefore, according to the configuration of the concave bead 30 of the present embodiment, the formation positions of the ridgelines 42 formed on both ends of the bottom surface portion 40 of the concave bead 30 are positioned from the position of the neutral axis N to the outer flange where welding W-joining is performed. It is the positional direction of the portion 28 and the inner flange portion 36 .

<Neutral axis N>
The explanation of the neutral axis N is as explained in the above-mentioned "Problems to be Solved by the Invention", but further details are also explained in Japanese Patent Application Laid-Open No. 2019-85073 filed by the present applicant. Please refer to it.

<Detailed Configuration of Concave Bead 30>
In the present embodiment, the concave bead 30 formed on the top plate portion 24 of the pillar outer member 12 is in the range A in FIG. See Figure 3). The range A is the upper position of the vehicle center pillar structure 10, and the concave bead 30 is formed in this position in the longitudinal direction.

As shown in FIGS. 1 and 2, the formation width of the concave bead 30 in the front-rear direction (horizontal direction when viewed in the state shown in FIGS. 1 and 2) is gradually widened from the top to the bottom. . As shown in FIG. 3, the depth of formation of the concave bead 30 is the deepest in the longitudinal central position 46, and gradually decreases toward both sides 48 and 50. As shown in FIG. The range 48 indicates a gradual change in the upward direction, and the range 50 indicates a gradual change in the downward direction. Both gradual formations gradually become shallower from a deep position at the central portion 46 toward the ends in the longitudinal direction and are connected to the top plate portion 24 .

4 to 7 are cross-sectional views schematically showing formation changes of the concave bead 30 formed on the top plate portion 24 of the pillar outer member 12. FIG. 4 to 6 show formation changes in the range where the concave bead 30 is formed in FIG. 1, and FIG. 7 shows the formation state at the lower position where the concave bead 30 is not formed. 4 is a cross-section along line IV-IV in FIG. 1, FIG. 5 is a cross-section along line V-V in FIG. 1, FIG. 6 is a cross-section along line VI-VI, and FIG. 7 is a cross-section along line VII-VII in FIG. It shows a cross section.

4 to 6 showing the cross section of the range where the concave bead 30 is formed, the position of the bottom portion 40 of the concave bead 30 is below the neutral axis N in all cases. That is, the positions of the ridgelines 42 formed on both sides of the bottom surface portion 40 are positioned below the neutral axis N. As shown in FIG. As a result, the rigidity of the area below the neutral axis N in the range where the concave bead 30 is formed is increased.

<Second embodiment>
Next, a second embodiment will be described. FIG. 9 schematically shows a cross section of the vehicle center pillar structure 10 of the second embodiment. In the second embodiment, the recessed bead 30 formed in the pillar outer member 12 and the recessed bead 38 formed in the pillar inner member 14 are overlapped and integrally joined by spot welding W. be. More specifically, the bottom portion 40 of the recessed bead 30 and the top surface portion 52 of the recessed bead 38 are overlapped, and the overlapped portions are integrally joined by welding. With such a configuration, the rigidity of the vehicle center pillar structure 10 can be further increased. In addition, detailed description is omitted by attaching|subjecting the same code|symbol to the substantially same structure location as embodiment mentioned above, and showing it.

<Third Embodiment>
Next, a third embodiment will be described. FIG. 10 schematically shows a cross section of a vehicle center pillar structure 10 of the third embodiment. The third embodiment is characterized by the shape of the bottom portion 40 of the concave bead 30 formed on the pillar outer member 12 . Its characteristic configuration is a configuration in which a convex bead 54 projecting upward is further formed at the central position of the bottom surface portion 40 as viewed in FIG. 10 . By forming the convex bead 54, the so-called number of ridge lines is formed by adding four ridge lines 56a, 56b, 56c and 56d in addition to the two ridge lines 42L and 42R of the above embodiment. Thereby, the rigidity of the vehicle center pillar structure 10 can be further increased.

In the third embodiment, the positions of the four additionally formed ridgelines 56a, 56b, 56c, and 56d are also positioned below the neutral axis N as viewed in FIG. Also in the third embodiment, the same reference numerals are assigned to substantially the same components as in the above-described embodiment, and detailed description thereof is omitted.

<Action and effect of the present embodiment>
According to the present embodiment, first, the rigidity of the pillar outer member 12 can be improved as in the conventional case by the concave bead 30 formed in the top plate portion 24 of the pillar outer member 12, which has been conventionally set.

The position of the ridge line 42 formed by the concave bead 30 is set in the direction of the flange portion positions 28 and 36 where the pillar outer member 12 and the pillar inner member 14 are welded from the neutral axis N. The tensile stress acting on the portions 28, 36 can be reduced. As a result, breakage of the welding of the flange portions 28 and 36 can be prevented or suppressed.

In this embodiment, the concave bead 30 is formed at a position above the vehicle center pillar structure 10 in the vertical direction, and this position has a convex curvature shape in the longitudinal direction. functionally.

<Other embodiments>
While specific embodiments of the invention have been described above, the invention may be embodied in many other forms.

For example, the above embodiment was the case of the vehicle center pillar structure 10 . However, it is also applicable to the first A-pillar structure and the third C-pillar structure from the front of a vehicle such as an automobile.

Moreover, although the range formed into the convex curvature shape in the above-described embodiment is the range of the upper portion, the entire longitudinal direction may be formed into a convex shape. In such a case, the concave bead 30 formed on the top plate portion 24 may also be formed over the entire range. Also, the concave bead 30 may be formed at a location that is not formed into a convex curvature shape.

Moreover, in the above embodiment, the pillar outer member 12 is made of a high-strength steel plate, but it may be made of a general steel plate.

Further, the longitudinal depth of the recessed bead 30 formed in the top plate portion 24 of the pillar outer member 12 in the above-described embodiment is the deepest at the central portion and gradually becomes shallower toward both sides. However, if molding is possible, it may be configured such that the concave bead 30 has the same formation depth over the entire length range.

<Effects of each invention described in "Means for Solving the Problems">
Finally, the effects of the above-described embodiments corresponding to the inventions in the above-described "Means for Solving the Problems" will be added.

First, according to the first invention, the concave bead formed on the top plate portion of the pillar outer member has a shape in which a ridge line is formed on the bottom surface portion thereof. The rigidity of the concave bead is improved by the structure of the ridge line.

Further, according to the first invention, the position where the ridgeline is formed is the vehicle inner side direction from the position of the neutral axis formed by the entire pillar structure. By locating the ridge line of the concave bead inward of the vehicle from the neutral axis, it is possible to reduce the tensile stress acting on the flange joint between the pillar outer member and the pillar inner member in the event of a side collision. As a result, it is possible to prevent or suppress breakage of the welded portion of the flange joint.

Next, according to the second invention, the range of the convex curvature shape in the vehicle pillar structure is the upper position, and the concave bead is formed on the top plate portion of the pillar outer member at the upper position. be. Since the side impact load at the time of a side impact generally acts on the upper portion of the vehicle pillar structure, it functions effectively in the side impact of the vehicle.

Next, according to the third invention, the pillar outer member is made of a high-strength steel plate. In spot welding of high-strength steel sheets, a problem of so-called HAZ fracture occurs when the tensile stress is large. According to the present invention, even when a high-tensile steel plate is used to increase the rigidity of the pillar outer member, the tensile stress acting on the welded portion of the high-tensile steel plate can be reduced, so HAZ fracture can be prevented or suppressed.

Next, according to the fourth invention, the bottom portion of the concave bead formed in the top plate portion of the pillar outer member and the pillar inner member are integrally joined by welding. Thereby, the rigidity of the concave bead can be improved.

Next, according to the fifth invention, the depth of formation of the concave bead formed on the top plate portion of the pillar outer member is the deepest at the central portion, and is gradually reduced toward both sides. Thereby, the moldability of the top plate portion of the pillar outer member forming the concave bead is improved. In other words, the formation of the concave bead is likely to crack, but the crack can be prevented or suppressed.

10 Vehicle center pillar structure (vehicle pillar structure)
12 Pillar outer member 14 Pillar inner member 16 Mounting portion 18 Roof side rail 20 Mounting portion 22 Side sill 24 Top plate portion 26 Outer side plate portion 26L Left outer side plate portion 26R Right outer side plate portion 28 Outer flange portion 28L Left outer flange portion 28R Right side 30 concave bead (formed on pillar outer member 12)
32 bottom plate portion 34 inner side plate portion 34L left inner side plate portion 34R right inner side plate portion 36 inner flange portion 36L left inner flange portion 36R right inner flange portion 38 concave bead (formed in pillar inner member 14)
40 bottom surface portion 42 ridgeline 42L left ridgeline 42R right ridgeline 44L left side surface (formed in concave bead 30)
44R right side (formed on concave bead 30)
46 central position (longitudinal direction of concave bead 30)
48 both sides (longitudinal of central position 46)
50 both sides (longitudinal of central position 46)
52 Top surface 54 Convex bead 56a-d Ridge line A Curvature shape range of convex shape N Neutral axis W Welding

Claims (4)

An elongated vehicle pillar structure having a convex curvature with respect to a direction in which a load acts on at least a partial range in the longitudinal direction, the vehicle pillar structure having a cross section orthogonal to the elongated direction. A pillar outer member having a hat-shaped cross-section as a basic shape and a pillar inner member closing an opening side of the hat-shaped cross-section of the pillar outer member. The flange of the pillar outer member and the flange of the pillar inner member are welded together. A pillar structure for a vehicle, wherein a concave bead is formed in a longitudinal direction on a hat-shaped cross-sectional top plate portion of the pillar outer member which is integrally joined and has a convex curvature shape in the pillar structure for a vehicle. and
The recessed bead formed on the top plate portion of the pillar outer member has a shape in which a ridge line is formed on the bottom surface portion thereof, and the position where the ridge line is formed is positioned toward the inside of the vehicle from the neutral axis formed by the entire pillar structure. and
The range of the convex curvature shape in the vehicle pillar structure is the upper position of the vehicle pillar structure, and the concave bead formed on the top plate portion of the pillar outer member is also formed at the upper position. vehicle pillar structure. The vehicle pillar structure according to claim 1,
The pillar structure for a vehicle, wherein the pillar outer member is formed of a high-strength steel plate . A pillar structure for a vehicle according to claim 1 or claim 2,
A pillar structure for a vehicle, wherein a bottom portion of a concave bead formed in a top plate portion of the pillar outer member and the pillar inner member are integrally joined by welding . The vehicle pillar structure according to any one of claims 1 to 3,
A pillar structure for a vehicle, wherein the formation depth of the concave bead formed in the top plate portion of the pillar outer member in the longitudinal direction is the deepest at the central portion and gradually becomes shallower toward both sides .

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