JP2007269241A - Vehicular pillar reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular pillar reinforcing structure which efficiently demonstrates the strength to the weight, ensures the sufficient strength, and further reduces the weight. <P>SOLUTION: An outer reinforcement 11 connects an upper edge and a lower edge of a door opening to each other on a cabin side of an outer panel, and has an upper part 11a, a lower part 11c, and an intermediate part 11b therebetween. Two tubular reinforcing members 13 have a rectangular closed section, and are arranged along the outer reinforcement 11 on its cabin side. The intermediate part 11c is formed in a flat plate shape along the outer panel, and the lower part 11c comprises a flat plate part 11d along the outer panel, and a wall part 11e which is partially erected from the flat plate part 11d and directed to the cabin side. The tubular reinforcing members 13 are arranged so that the direction of a pair of long ridges in the rectangular closed section are directed along the direction from the outer panel to the cabin side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pillar reinforcement structure for a vehicle that forms a vertical frame portion that defines a door opening at a side portion of a vehicle and is disposed on a vehicle compartment side with respect to an outer panel.

  2. Description of the Related Art Conventionally, there is known a vehicle pillar reinforcement structure that forms a vertical frame portion that defines a door opening in a side portion of a vehicle and is disposed on a vehicle compartment side with respect to an outer panel (for example, Patent Documents 1, 2, and 3). reference). In Patent Document 1, a reinforcement, a reinforcing plate, a steel pipe, and the like having a structure divided into an upper part and a lower part are disposed inside a center pillar having a closed cross-sectional structure composed of an outer panel and an inner panel. A center pillar reinforcing structure is disclosed. The reinforcing plate is fixed to the door lock mounting part and fixed to the lower reinforcement, and the steel pipe is fixed to the upper and lower reinforcements by mounting brackets having the same length as this pipe and formed in an L-shaped channel shape. Yes.

  Further, Patent Document 2 discloses a center pillar reinforcing structure in which a mold material is housed and arranged in a center pillar having a closed cross-sectional structure. The mold material in the center pillar is fixed by welding to respective reinforcing members screwed to upper and lower hinge mounting seats and door lock striker seats provided on the center pillar. Further, Patent Document 3 discloses a pillar reinforcing structure in which a closed cross-section reinforcing member is disposed on a closed cross-section center pillar having an outer panel and a pair of upper and lower connecting plates. The reinforcing member is fixed to the connecting plate, and is provided so as to extend integrally from the front portion of the roof rail through the center pillar to the front portion of the side sill.

JP-A-8-276864 (page 2-3, FIG. 2-3) JP-A-9-254809 (page 3, Fig. 2-3) JP 2000-219153 A (page 4-5, FIGS. 1 and 4)

  The center pillar reinforcing structure described in Patent Document 1 is a structure in which a reinforcement, a reinforcing plate, a steel pipe, and a mounting bracket having the same length as the steel pipe are disposed inside the center pillar. As the number of constituent members increases, the weight of the pillar structure tends to increase. Moreover, in this center pillar structure, although the steel pipe is disposed in the center pillar, the steel pipe is merely disposed through the mounting bracket, and the strength of the steel pipe is independent. Therefore, a structure that exhibits strength more efficiently with respect to weight is desired. In addition, the vehicle pillar reinforcing structures described in Patent Documents 2 and 3 are merely provided with a mold member and a reinforcing member having a closed cross section in the center pillar, and the strength of these mold members and the reinforcing member is also provided. Therefore, a structure that exhibits strength more efficiently with respect to weight is desired.

  In view of the above circumstances, the present invention provides a pillar reinforcing structure for a vehicle that can exhibit strength more efficiently with respect to weight, and can ensure sufficient strength and further reduce weight. Objective.

Means and effects for solving the problems

The present invention relates to a pillar reinforcement structure for a vehicle that forms a vertical frame portion that defines a door opening in a side portion of a vehicle and is disposed on a vehicle compartment side with respect to an outer panel.
And the pillar reinforcement structure of the vehicle of this invention has the following some features in order to achieve the said objective. That is, the present invention comprises the following features alone or in appropriate combination.

  In order to achieve the above object, the first feature of the vehicle pillar reinforcing structure according to the present invention is that the upper edge portion and the lower edge portion forming the door opening are vertically moved on the vehicle compartment side of the outer panel. An upper part attached to the upper edge, a lower part attached to the lower edge, and disposed between the upper part and the lower part. An outer reinforcement having an intermediate portion formed integrally with the outer reinforcement, and attached to a vehicle compartment side with respect to the outer reinforcement, having a rectangular closed cross section and extending along the outer reinforcement Two tubular reinforcing members, and the intermediate portion is formed in a flat plate shape along the outer panel, and the lower portion is along the outer panel. A flat plate-like portion formed on the flat plate-like portion, and a wall portion formed so as to be partially erected with respect to the flat plate-like portion and oriented toward the passenger compartment. It is arrange | positioned so that the direction of a pair of long side in the said rectangular closed cross section may orientate along the direction which goes to the vehicle compartment side from the said outer panel.

  According to this configuration, the outer reinforcement has a flat middle portion and a lower portion formed of a flat portion and a wall partly standing on the lower portion. Can be significantly reduced in weight. On the other hand, since two tubular reinforcing members having a rectangular closed cross section are attached along the outer reinforcement, the cross section second moment is increased to ensure high rigidity and realize a high strength reinforcing structure. Can do. And since each tubular reinforcement member is arranged so that the direction of a pair of long sides in the rectangular closed cross section is oriented along the direction from the outer panel toward the passenger compartment side, the impact load from the outside of the vehicle to the vehicle side portion Even when is added, sufficient strength can be exhibited. That is, even if the outer reinforcement is provided with a large number of portions formed in a flat plate shape and is significantly reduced in weight, sufficient strength can be ensured by the two tubular reinforcing members. Therefore, according to the present invention, sufficient strength can be secured with a small amount of material compared to the conventional vehicle pillar reinforcing structure. That is, it is possible to provide a vehicle pillar reinforcing structure capable of exhibiting strength more efficiently with respect to weight, ensuring sufficient strength and enabling further weight reduction.

  The second feature of the vehicle pillar reinforcing structure according to the present invention is that the tubular reinforcing member is a steel material having a tensile strength of 700 MPa or more, and is formed by roll forming.

  According to this configuration, pipe-forming high-strength steel can be easily processed by roll forming, so even a pipe-shaped member made of high-strength steel having a tensile strength of 700 MPa or more is formed in a rectangular closed cross section. Thus, a tubular reinforcing member can be obtained. Moreover, according to roll forming, a tubular reinforcement member can be processed continuously and efficiently. Therefore, according to the configuration of the present invention, a tubular reinforcing member made of high-strength steel having a rectangular closed cross section can be efficiently produced.

  A third feature of the pillar reinforcing structure for a vehicle according to the present invention is that the tubular reinforcing member is arranged so that the upper end side portion disposed so as to face the upper portion is in the longitudinal direction of the tubular reinforcing member. That is, it is partially cut so that the cross section changes.

  According to this configuration, since the upper end portion of the tubular reinforcing member is partially cut so that the cross section changes in the longitudinal direction, the weight of the tubular reinforcing member can be reduced. On the other hand, even when an impact load is applied from the outside of the vehicle to the side of the vehicle, the upper end portion of the tubular reinforcing member has a very small effect on the strength. Can be kept small. Therefore, further weight reduction can be achieved while suppressing a decrease in strength.

  The fourth feature of the pillar reinforcing structure for a vehicle according to the present invention is that the two tubular reinforcing members are arranged such that portions disposed so as to face the intermediate portion are separated from each other. It is established.

  According to this configuration, since the two tubular reinforcing members are disposed so that the portions disposed so as to face the intermediate portion of the outer reinforcement are separated from each other, the pillar reinforcing structure as a whole is provided. The cross-section secondary moment can be further increased, and a high torsional rigidity can be obtained, thereby further ensuring a high strength.

  The fifth feature of the vehicle pillar reinforcing structure according to the present invention is that the two tubular reinforcing members are spaced apart from each other at lower end portions disposed so as to face the lower portion. It is arranged so that it is.

  According to this configuration, since the two tubular reinforcing members are disposed so that the portions disposed so as to face the lower portion of the outer reinforcement are separated from each other, the entire pillar reinforcing structure is provided. In addition, the moment of inertia of the cross section can be increased, and a high torsional rigidity can be obtained, thereby further ensuring a high strength.

  The sixth feature of the vehicle pillar reinforcing structure according to the present invention is that the tubular reinforcing member arranged on the front side in the vehicle front-rear direction among the two tubular reinforcing members is arranged on the rear side. It is formed so that the length of the lower end side arrange | positioned so that the said lower part may be opposed with respect to a tubular reinforcement member may become short.

  According to this structure, since the length of the lower end side of the tubular reinforcing member on the vehicle front side of the two tubular reinforcing members is shortened, the lower portion of the pillar structure is easily deformed. When the impact load is applied from the outside of the vehicle to the side of the vehicle, the pillar reinforcing structure can be deformed near the position of the occupant's waist. And since the length of the tubular reinforcing member on the front side is formed short, when the impact load is applied from the outside of the vehicle to the vehicle side portion, the tubular reinforcing member on the rear side is deformed, and the rear side of the occupant The side sill reinforcement structure under the pillar can be deformed on the side.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. A vehicle pillar reinforcing structure according to an embodiment of the present invention is widely applied as a pillar reinforcing structure that forms a vertical frame portion that defines a door opening in a side portion of a vehicle and is disposed on a vehicle compartment side with respect to an outer panel. Can do.

  FIG. 1 is a front view showing a pillar reinforcing structure 1 (hereinafter simply referred to as “pillar reinforcing structure 1”) of a vehicle according to the present embodiment, and FIG. 2 is a rear view of the pillar reinforcing structure 1. 1 is a view of the pillar reinforcing structure 1 as viewed from the vehicle exterior side, and FIG. 2 is a view of the pillar reinforcing structure 1 as viewed from the vehicle compartment side. 1 and 2, the side indicated by the arrow (a) is the front side of the vehicle, and the side indicated by the arrow (b) is the rear side of the vehicle (similarly, the arrows (a) and (b in FIG. 3). ) The pillar reinforcing structure 1 is used as a center pillar of a vehicle (not shown), and forms a vertical frame portion that defines a door opening on a side portion of the vehicle. An outer panel (a steel plate provided on the outermost side of the vehicle side portion) (not shown) is arranged on the outer side of the pillar reinforcing structure 1 (that is, the pillar reinforcing structure 1 is provided on the vehicle side of the outer panel). Arranged).

  As shown in FIGS. 1 and 2, the pillar reinforcing structure 1 includes an outer reinforcement 11 disposed on the vehicle exterior side and an inner panel 12 disposed on the vehicle compartment side. FIG. 3 is a front view showing the pillar reinforcing structure 1 with the outer reinforcement 11 removed. As shown in FIG. 3, the pillar reinforcing structure 1 also includes two tubular reinforcing members 13 (13a, 13b).

  The outer reinforcement 11 shown in FIGS. 1 and 2 is configured as a sheet metal part formed by subjecting a steel plate to pressure forming such as press forming. The outer reinforcement 11 has an upper edge (roof side rail) (not shown) and a lower edge (side sill) (not shown) forming a door opening in the vehicle body to which the pillar reinforcing structure 1 is attached. Are provided so as to be connected in the vertical direction. The outer reinforcement 11 is disposed between the upper part 11a attached to the roof side rail, the lower part 11c attached to the side sill, and the upper part 11a and the lower part 11c. And an intermediate portion 11b formed on the surface.

  4 and 5 are side views of the pillar reinforcing structure 1 shown in an exploded state. FIG. 4 is a view from the vehicle front side, and FIG. 5 is a view from the vehicle rear side. 4 and 5, the side indicated by the arrow (c) is the vehicle compartment side, and the side indicated by the arrow (d) is the vehicle exterior side. 6 and 7 are exploded perspective views of the pillar reinforcing structure 1. FIG. 6 is an oblique view from the outside of the vehicle. FIG. 7 is an oblique view from the outside of the vehicle.

  The intermediate portion 11b of the outer reinforcement 11 is formed along an outer panel (not shown), and is formed in a flat plate shape as shown in FIGS. Further, the lower portion 11c of the outer reinforcement 11 is partly raised with respect to the flat plate portion 11d (see FIG. 5) formed along the outer panel similarly to the intermediate portion 11b and the flat plate portion 11d. And a wall portion 11e formed so as to be oriented toward the passenger compartment. In the outer reinforcement 11, as shown in FIGS. 4 and 5, a wall portion 11e is erected only from an edge of the flat plate portion 11d on the vehicle front side (that is, the vehicle rear side of the flat plate portion 11d). The wall is not erected from the side edge).

  The inner panel 12 shown in FIGS. 1 to 7 is joined to an outer panel (not shown) by flange portions formed at the edge portions. Then, the outer panel and the inner panel 12 are joined to appropriately form a closed cross section between them, and the outer reinforcement 11 and the tubular reinforcing member 13 are disposed in the closed cross section. In addition, the inner panel 12 may be omitted, and the pillar reinforcing structure may be constructed only by the outer reinforcement 11 and the tubular reinforcing member 13.

  As shown in FIGS. 3 to 7, the two tubular reinforcing members 13 (13 a, 13 b) are attached to the vehicle compartment side with respect to the outer reinforcement 11 and have a rectangular closed cross section and the outer reinforcement 11. It is arrange | positioned so that it may extend along. The tubular reinforcing member 13a is disposed on the front side of the vehicle, and the tubular reinforcing member 13b is disposed on the rear side of the vehicle. The rectangular closed cross section of the tubular reinforcing member 13 is formed, for example, as a substantially rectangular cross section or a substantially trapezoidal cross section (a trapezoidal cross section having a trapezoidal height larger than the dimensions of the upper and lower bases). . And the tubular reinforcement member 13 is arrange | positioned so that the direction of a pair of long side in the rectangular closed cross section may orient along the direction which goes to the vehicle compartment side from the outer panel 11. FIG.

  As shown in FIGS. 4 to 7, each tubular reinforcing member 13 has an upper end portion 14 disposed so as to face the upper portion 11 a of the outer reinforcement 11 in the longitudinal direction of the tubular reinforcing member 13. It is partially cut so that the cross section changes in the direction.

  Further, as shown in FIGS. 3, 6, and 7, the two tubular reinforcing members 13 include a portion disposed so as to face the intermediate portion 11 b of the outer reinforcement 11, and a lower portion 11 c. Are disposed so as to be separated from each other. As shown in FIGS. 3, 4, 6, and 7, the tubular reinforcing member 13 a disposed on the front side of the vehicle among the two tubular reinforcing members 13 is disposed on the rear side. The reinforcing member 13b is formed so that the length on the lower end side disposed to face the lower portion 11c of the outer reinforcement 11 is shortened.

  The tubular reinforcing member 13 is a steel material having a tensile strength of 700 MPa or more, and is formed by roll forming. For example, the tubular reinforcing member 13 can be formed by a roll forming apparatus that continuously forms a tube material with a pair of drive rolls arranged in the vertical height direction and the horizontal width direction. In this case, a tube-shaped member made of high-strength steel having a tensile strength of 700 MPa or more is inserted between the rolls so as to be drawn with the rotation of the drive roll, so that the cross-section of the tube-shaped member becomes a roll gap. It is processed into a rectangular cross section according to the above. In producing the tubular reinforcing member 13, there are a case where quenching is not performed after roll forming and a case where quenching is performed. The tensile strength of the tubular reinforcing member 13 when used as it is after roll forming without quenching can be set to 700 MPa or more and 1600 MPa or less, and the tubular reinforcing member 13 when used after quenching after roll forming. The tensile strength of can be set to 1200 MPa or more and 2000 MPa or less.

  FIG. 8 is a perspective view showing an example of a deformed state when a circular pipe made of high-strength steel is formed to have a larger diameter by hydroforming rather than roll forming. When forming a pipe by hydroforming, the pipe is processed into a desired cross-sectional shape while increasing the diameter by applying an internal pressure to reduce the plate thickness. For this reason, as shown in FIG. 8, when the pipe internal pressure is increased during molding by hydroforming, the pipe is ruptured (burst is generated) when a predetermined pressure (burst pressure) is reached. When a steel material is used, it becomes easy to ensure high strength. However, in the case of a steel material, the elongation (%) tends to decrease as the tensile strength (MPa) increases. Therefore, the higher the strength of the tube material to be molded (the higher the tensile strength), the higher the burst pressure, the more difficult the molding becomes, and the tube expansion rate (the elongation rate of the tube diameter when bursting, that is, the diameter can be expanded). The maximum elongation of the pipe diameter is reduced.

  FIG. 9 shows the result of analyzing the relationship between the tensile strength TS (MPa), the tube expansion rate (%), and the burst pressure (MPa) when a pipe is formed by hydroforming. In the case of hydroforming, as shown in FIG. 9, the higher the tensile strength, the higher the burst pressure and the more difficult the molding becomes, and the tube expansion rate decreases. In particular, when the tensile strength is 700 MPa or more, the burst pressure suddenly rises and the tube expansion rate decreases, so that molding becomes extremely difficult.

  However, when forming by roll forming like the tubular reinforcing member 13 of the present embodiment, it is not processed while reducing the plate thickness by increasing the diameter as in hydroforming, but continuously deforming between rolls. It will be processed into a desired cross-sectional shape. For this reason, even if it is a steel material with high tensile strength, it can shape | mold easily and continuously efficiently. In addition, by using a roll forming apparatus in which a plurality of roll sets (a pair of rolls) are arranged from the upstream side to the downstream side, the desired cross-sectional shape can be processed while being gradually deformed between the rolls of each roll set. it can. In addition, even if it is a case where it shape | molds passing a several roll set, since it can process continuously, it can ensure high production efficiency. In addition, when forming into a rectangular cross section by hydroroaming, it is difficult to increase the curvature at the corner (it is difficult to reduce the curvature radius) because it is deformed while reducing the plate thickness. . However, when a rectangular cross section is formed by roll forming, a large curvature (small curvature radius) can be easily secured at the corner portion.

  Next, the result of analyzing the relationship between weight and strength in the pillar reinforcing structure 1 will be described. FIG. 10 is a cross-sectional view schematically showing a cross section of the pillar reinforcing structure 1 corresponding to the position of the arrow X-X in FIG. 2 together with the outer panel 15, and analyzing the relationship between the weight and the strength in the pillar reinforcing structure 1. This shows an analysis model for doing this. In the pillar structure shown in FIG. 10 (this embodiment configured to include the pillar reinforcement structure 1 and the outer panel 15), the pillar reinforcement structure 1 is disposed on the vehicle compartment side of the outer panel 15, and the flange portion 15a of the outer panel 15 and The flange portion 12a of the inner panel 12 is joined. The tubular reinforcing member 13 is joined to the outer reinforcement 11 and the inner panel 12 respectively.

  11 and 12 show a cross section (analytical model) of the pillar reinforcing structure analyzed in comparison with the pillar reinforcing structure 1 with respect to the relationship between the weight and the strength. A pillar structure (Comparative Example 1) shown in FIG. 11 includes an outer panel 16, an outer reinforcement 17 disposed along the outer panel 16, and a hinge reinforcement 18 disposed along the outer reinforcement 17. And an inner panel 19 that is joined to the outer panel 16 at flange portions. Further, the pillar structure (Comparative Example 2) shown in FIG. 12 is disposed along the outer panel 20, the outer reinforcement 21 disposed along the outer panel 20, and one corner portion of the outer reinforcement 21. And a pipe 23 disposed along the bracket 22. In the comparative example 2, the outer pillar 21 corresponding to the reinforcement, the bracket 22 corresponding to the mounting bracket, and the pipe 23 corresponding to the steel pipe are provided in the same manner as the center pillar reinforcing structure described in Patent Document 1. It is what it has.

  With respect to each analysis model shown in FIGS. 10 to 12, the members in each analysis model are such that the pillar structure having a unit length (1 m) having each cross-sectional shape has the same level of bending strength in the three-point bending test. The combination of was analyzed by simulation. In the analysis, the bending strength of the pillar structure of the present example was used as a reference, and in Comparative Examples 1 and 2, combinations of members having the same level of strength were analyzed. The tubular reinforcing member 13 of this example and the pipe of Comparative Example 2 were analyzed by taking as an example a case where both are high strength steel of 1270 MPa. As a result of this analysis, it was found that the same level of bending strength can be obtained in each of the pillar structures of this example, comparative example 1, and comparative example 2 by using a combination of members as shown in FIG. In the case of the combination of members shown in FIG. 13, the weight per unit length (1 m) is 13.4 kg in Comparative Example 1, 10.9 kg in Comparative Example 2, and 6.5 kg in this Example. As compared with Examples 1 and 2, it was found that the weight can be greatly reduced in this example even with the same strength.

  As described above, according to the pillar reinforcing structure 1 of the present embodiment, the outer reinforcement 11 has the intermediate portion 11b formed in a flat plate shape, and the lower portion 11c partially erected on the flat plate portion 11d. Therefore, the weight of the outer reinforcement 11 can be significantly reduced. On the other hand, two tubular reinforcing members 13 having a rectangular closed cross section are attached along the outer reinforcement 11, so that the secondary moment is increased to ensure high rigidity and a high strength reinforcing structure is realized. can do. And since each tubular reinforcement member 13 is arrange | positioned so that the direction of a pair of long side in a rectangular closed cross section may be oriented along the direction which goes to a vehicle compartment side from an outer panel, it impacts on the vehicle side part from the vehicle outside. Even when a load is applied, sufficient strength can be exhibited. That is, sufficient strength can be ensured by the two tubular reinforcing members 13 even if the outer reinforcement 11 is provided with a large number of portions formed in a flat plate shape and is greatly reduced in weight. Therefore, according to the pillar reinforcement structure 1, sufficient strength can be secured with a small amount of material compared to the conventional pillar reinforcement structure. That is, it is possible to provide a vehicle pillar reinforcing structure capable of exhibiting strength more efficiently with respect to weight, ensuring sufficient strength and enabling further weight reduction.

  In addition, since pipe-forming high-strength steel can be easily processed by roll forming, even a pipe-shaped member made of high-strength steel having a tensile strength of 700 MPa or more is formed into a rectangular closed cross section and is tubular. The reinforcing member 13 can be obtained. Moreover, according to roll forming, the tubular reinforcing member 13 can be processed continuously and efficiently. Therefore, in the production of the pillar reinforcing structure 1, the tubular reinforcing member 13 made of high-strength steel having a rectangular closed cross section can be efficiently produced.

  Moreover, according to the pillar reinforcement structure 1, since the part 14 of the upper end side of the tubular reinforcement member 13 is partly cut so that a cross section may change in a longitudinal direction, weight reduction of the tubular reinforcement member 13 is achieved. Can do. On the other hand, even when an impact load is applied from the outside of the vehicle to the side of the vehicle, the upper end portion 14 of the tubular reinforcing member 13 has a very small influence on the strength. Can be very small. Therefore, further weight reduction can be achieved while suppressing a decrease in strength.

  Further, according to the pillar reinforcing structure 1, the two tubular reinforcing members 13 are disposed so that the portions disposed so as to face the intermediate portion 11b of the outer reinforcement 11 are separated from each other. Further, the secondary moment of the section of the pillar reinforcing structure 1 as a whole can be further increased, high torsional rigidity can be obtained, and higher strength can be ensured.

  Moreover, according to the pillar reinforcement structure 1, the two tubular reinforcement members 13 are disposed such that the portions disposed to face the lower portion 11c of the outer reinforcement 11 are separated from each other. Therefore, the cross-sectional secondary moment of the pillar reinforcing structure 1 as a whole can be further increased, high torsional rigidity can be obtained, and higher strength can be ensured.

  Moreover, according to the pillar reinforcement structure 1, since the length of the lower end side of the tubular reinforcement member 13a on the vehicle front side of the two tubular reinforcement members 13 is shortened, the lower side of the pillar structure is formed. The part is easily deformed, and the pillar reinforcing structure 1 can be deformed near the position of the occupant's waist when an impact load is applied from the outside of the vehicle to the side of the vehicle. And since the length of the tubular reinforcement member 13a on the front side is formed short, when the impact load is applied from the outside of the vehicle to the vehicle side portion, the tubular reinforcement member 13b on the rear side is deformed. The pillar reinforcing structure 1 can be deformed on the rear side.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

It is a front view showing a pillar reinforcement structure of vehicles concerning an embodiment of the present invention. It is a rear view of the pillar reinforcement structure of the vehicle shown in FIG. FIG. 2 is a front view showing the pillar reinforcing structure for a vehicle shown in FIG. 1 with an outer panel removed. It is a side view shown in the state which decomposed | disassembled the pillar reinforcement structure of the vehicle shown in FIG. It is a side view shown in the state which decomposed | disassembled the pillar reinforcement structure of the vehicle shown in FIG. It is a disassembled perspective view of the pillar reinforcement structure of the vehicle shown in FIG. It is a disassembled perspective view of the pillar reinforcement structure of the vehicle shown in FIG. It is the perspective view which showed the example of a deformation | transformation state in the case of shape | molding so that the diameter of the circular pipe which consists of high strength steel may be expanded by hydroforming. It is the result of having analyzed the relationship between the tensile strength, the pipe expansion rate, and the burst pressure when forming a pipe by hydroforming. 2 shows an analysis model for analyzing the relationship between weight and strength in the pillar reinforcing structure shown in FIG. 1. FIG. 11 shows a cross section of a pillar reinforcing structure analyzed in comparison with the pillar reinforcing structure shown in FIG. 10 with respect to the relationship between weight and strength. FIG. 11 shows a cross section of a pillar reinforcing structure analyzed in comparison with the pillar reinforcing structure shown in FIG. 10 with respect to the relationship between weight and strength. It shows as a result of analyzing a combination of members having the same level of bending strength in each pillar reinforcing structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle pillar reinforcement structure 11 Outer reinforcement 11a Upper part 11b Middle part 11c Lower part 11d Flat plate part 11e Wall part 13, 13a, 13b Tubular reinforcement member

Claims (6)

A pillar reinforcing structure for a vehicle that forms a vertical frame portion that defines a door opening in a side portion of the vehicle and is disposed on the vehicle compartment side with respect to the outer panel,
An upper portion that is provided so as to connect an upper edge portion and a lower edge portion forming the door opening in a vertical direction on a vehicle compartment side of the outer panel, and is attached to the upper edge portion; An outer reinforcement having a lower portion attached to the edge, and an intermediate portion disposed between and formed integrally with the upper portion and the lower portion;
Two tubular reinforcing members attached to the vehicle compartment side with respect to the outer reinforcement, having a rectangular closed cross section and disposed so as to extend along the outer reinforcement;
With
The intermediate portion is formed in a flat plate shape along the outer panel,
The lower portion includes a flat plate-like portion formed along the outer panel, and a wall portion formed so as to be partially erected with respect to the flat plate-like portion and oriented toward the passenger compartment side. Have
The tubular reinforcing member is disposed so that a direction of a pair of long sides in the rectangular closed cross section is oriented along a direction from the outer panel toward the passenger compartment side. Reinforced structure.   The pillar reinforcing structure for a vehicle according to claim 1, wherein the tubular reinforcing member is a steel material having a tensile strength of 700 MPa or more, and is formed by roll forming.   The tubular reinforcing member is characterized in that a part on an upper end side disposed so as to face the upper part is partially cut so that a cross section changes in a longitudinal direction of the tubular reinforcing member. The pillar reinforcing structure for a vehicle according to claim 1 or 2.   The said two tubular reinforcement members are arrange | positioned so that the part arrange | positioned so as to oppose the said intermediate part may mutually be spaced apart. The vehicle pillar reinforcement structure according to claim 1.   The two tubular reinforcing members are disposed such that lower end portions disposed so as to face the lower portion are separated from each other. Item 5. The vehicle pillar reinforcement structure according to any one of Items 4 to 4.   Of the two tubular reinforcing members, the tubular reinforcing member disposed on the front side in the vehicle front-rear direction is disposed so as to face the lower portion of the tubular reinforcing member disposed on the rear side. The pillar reinforcing structure for a vehicle according to any one of claims 1 to 5, wherein a length of a lower end side of the vehicle is shortened.

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