JP2007083828A - Pillar structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pillar structure of a vehicle capable of securing sufficient strength and realizing further lightweight. <P>SOLUTION: A first reinforcing member 11 connecting upper and lower edges of a door opening has an upper portion 14, and a lower portion 15 integraly formed with the upper portion 14, forming a released space at the compartment side, and provided with a deformation inducing part 24. A second reinforcing member 13 has an upper opposite part 16 located opposite to the upper portion 14, and a lower mounting part 17 provided in continuous with it and mounted to the lower portion 15. The upper opposite portion 16 is formed so as to partition a plurality of closed faces 18 between it and the upper portion 14, and the lower mounting part 17 is formed along the lower portion 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a sheet metal part formed by press-molding a flat plate, and forms a vertical frame part that defines a door opening in a side part of a vehicle and applies an impact load from the outside of the vehicle to the side part of the vehicle. The present invention relates to a pillar structure of a vehicle that is formed so that the lower portion is more easily deformed than the upper portion of the vertical frame portion when the vertical frame portion is formed.

  2. Description of the Related Art Conventionally, there is known a vehicle pillar structure that is configured as a sheet metal part for a vehicle that is formed by press-molding a flat plate and that forms a vertical frame portion that defines a door opening at a side portion of the vehicle ( For example, see Patent Documents 1 and 2). Patent Document 1 discloses a vehicle pillar structure including a center pillar having an upper end welded to a roof side rail of a vehicle body and a lower end portion welded to a rocker rail of the vehicle body. In the center pillar, an outer panel and an inner panel formed so as to have a substantially trapezoidal cross section are joined to a flange provided at an edge thereof so that each trapezoidal cross section faces each other to form a closed cross section. It is composed of that. A reinforcement disposed in the vertical direction is provided inside the closed cross-sectional structure. This reinforcement is set to a shape that matches the inner surface of the outer panel in the closed section, shorter than the center pillar, and set to dimensions that correspond to the height of the upper half of the passenger seated in the passenger compartment. Has been. And the lower end part of the reinforcement is cut | judged in the shape which inclines with respect to a horizontal direction. Accordingly, it is an object to reduce the stress concentration when a load is applied to the center pillar by changing the rigidity of the center pillar at the boundary between the reinforcement setting portion and the non-setting portion.

  Further, Patent Document 2 discloses a vehicle pillar structure including a center pillar that is arranged so as to be bridged between a roof side rail and a rocker panel. The center pillar includes a pillar outer having a cross-sectional hat shape, a pillar inner, and a pillar reinforcement having a shape substantially along the inner surface of the pillar outer. And it has the structure where these edge parts were joined by spot welding, and, thereby, the square cylinder-shaped closed cross section extended in an up-down direction is formed. The pillar reinforcement is formed as a differential thickness bonded steel plate in which a thick plate portion on the upper side in the longitudinal direction and a thin plate portion having a smaller plate thickness are combined. Also, inside the pillar reinforcement, an inner member having a substantially U-shaped cross section that extends vertically across the connecting portion between the thick plate portion and the thin plate portion is disposed, and the lower end portion of the inner member is It is located between the coupling part and the rocker panel. Accordingly, the joint portion of the pillar reinforcement is reinforced by the inner member, and the purpose is to absorb the energy caused by the side collision by bending the lower end portion of the inner member below the joint portion and obtain a stable buckling mode.

Japanese Patent Laid-Open No. 2003-276639 (page 2-3, FIG. 1-2) JP 2002-347655 A (page 2-3, FIG. 1-3)

  The pillar structure of the vehicle described in Patent Documents 1 and 2 includes a structure that forms a vertical frame portion that partitions the door opening and reinforces the vertical frame portion. From the viewpoint of occupant protection, the lower portion is formed more easily than the upper portion of the vertical frame portion when an impact load is applied to the side portion of the vehicle from the outside of the vehicle. However, in these pillar structures, an outer and an inner that form a cylindrical closed section extending in the vertical direction are provided, and a member for further reinforcement is disposed in the closed section. Therefore, the weight of the pillar structure tends to increase. Therefore, it is desired to further reduce the weight of the pillar structure while maintaining the strength.

  In view of the above circumstances, an object of the present invention is to provide a vehicle pillar structure capable of ensuring sufficient strength and further reducing the weight.

Means and effects for solving the problems

The present invention is a sheet metal part formed by press-molding a flat plate, and forms a vertical frame part that defines a door opening in a side part of a vehicle, and an impact load is applied to the side part from the outside of the vehicle. The present invention relates to a pillar structure of a vehicle that is formed so that a lower portion is more easily deformed than an upper portion of the vertical frame portion when being done.
And the pillar 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.

  The first feature of the vehicle pillar structure according to the present invention for achieving the above object is a first reinforcing member for connecting an upper edge portion and a lower edge portion forming the door opening, It has an upper part attached to the upper edge part and a lower part attached to the lower edge part, and the lower part is formed integrally with the upper part and opened to the vehicle compartment side. A first reinforcing member that is provided with a deformation inducing portion that is a portion formed in the lower portion so as to be deformed more easily than the upper portion, and the lower portion, and the upper portion. A second reinforcing member having an upper facing portion disposed so as to be provided, and a lower mounting portion provided continuously to the upper facing portion and attached to the lower portion, The upper facing portion is between the upper portion and the upper portion. It is a cross section orthogonal to the longitudinal direction of the portion, and is formed so as to define a plurality of closed cross sections, and the lower mounting portion is formed along a side surface of the lower portion on the passenger compartment side. That is.

  According to this configuration, the first reinforcing member having the upper portion attached to the upper edge portion of the door opening and the lower portion attached to the lower edge portion, and the lower portion attached to the upper facing portion and the lower portion facing the upper portion. The vehicle pillar structure is formed by including the second reinforcing member having the side attachment portion. For this reason, there are few points of the member used as a component, and the weight reduction of the pillar structure of a vehicle is achieved. The second reinforcing member is formed and disposed so that the upper facing portion defines a plurality of closed cross sections (closed cross sections) with the upper portion of the first reinforcing member, and The lower attachment portion is formed and attached along the side surface on the passenger compartment side of the lower portion of the first reinforcing member. For this reason, high rigidity can be ensured by the second reinforcing member, and sufficient strength can be ensured with a small amount of material compared to the conventional pillar structure configured as a cylindrical closed cross section. Therefore, with respect to the pillar structure in which the lower portion is more easily deformed than the upper portion of the vertical frame portion of the door opening when an impact load is applied from the outside of the vehicle to the side portion of the vehicle, sufficient strength is secured. Further weight reduction can be achieved. Since the lower part is provided with a deformation inducing part, it is formed so that the lower part is more easily deformed than the upper part when an impact load is applied from the outside to the side part. . Further, since the lower portion forms a space opened to the vehicle compartment side, various parts such as door hinges and lock reinforcing parts, harnesses (electric wires), and the like can be disposed in this space.

  A second feature of the pillar structure of the vehicle according to the present invention is a third feature that is attached to the vehicle compartment side with respect to the first reinforcing member and disposed at a position facing the lower portion. The reinforcing member is further provided.

  According to this configuration, the third reinforcing member is disposed at a position facing the lower portion of the first reinforcing member, and is not disposed at a position facing the upper portion. Parts of the members are omitted. For this reason, by adding a lightweight third reinforcing member, it is possible to further improve the strength while suppressing an increase in weight. The third reinforcing member can also be used as a support member for supporting the seat belt retractor.

  A third feature of the pillar structure of the vehicle according to the present invention is that the upper adjacent portion is a portion formed to be adjacent to the upper facing portion along the side surface on the passenger compartment side of the upper portion. A lower adjacent portion that is a portion formed so as to be adjacently disposed along a side surface on the passenger compartment side of the lower portion in the lower attachment portion, and is continuously continuous with the upper adjacent portion. It is that you are.

  According to this configuration, the upper facing portion is provided with the upper adjacent portion along the upper portion, and the lower mounting portion is provided with the lower adjacent portion along the lower portion, and both these adjacent portions are gently It is formed to be continuous. For this reason, since the 1st reinforcement member and the 2nd reinforcement member are constituted integrally via both adjacent parts, the shape which has a plurality of closed sections is easy to be stabilized, and it becomes easy to secure high rigidity. Accordingly, it is possible to easily form a second reinforcing member that forms a plurality of closed cross sections with the upper portion and is attached so as to straddle along the lower portion to ensure high rigidity.

  The fourth feature of the vehicle pillar structure according to the present invention is that the upper facing portion is a cross section perpendicular to the longitudinal direction of the upper portion, and the upper adjacent portion forms a bottom. A first U-shaped portion having a cross section is formed, and the lower mounting portion is a cross-section perpendicular to the longitudinal direction of the upper portion, and the lower adjacent portion forms a base. A second U-shaped portion having a cross-section is formed, and the first U-shaped portion and the second U-shaped portion are smoothly continuous.

  According to this configuration, it is possible to easily form a shape in which the upper adjacent portion for forming a plurality of closed cross sections and the lower adjacent portion formed along the lower portion are smoothly continued.

  Further, a fifth feature of the vehicle pillar structure according to the present invention is that the plurality of closed cross sections are arranged in the front-rear direction of the vehicle and arranged side by side along the side portion. The part is formed.

  According to this configuration, a plurality of closed sections are arranged side by side in the direction along the side of the vehicle longitudinal direction. High strength can be secured.

  The sixth feature of the vehicle pillar structure according to the present invention is that the overall shape of the cross section perpendicular to the longitudinal direction of the upper portion formed by the upper portion and the upper facing portion is a line-symmetric shape. That is.

  According to this configuration, since the shape having a plurality of closed cross sections is configured as a line-symmetric shape, it is easy to ensure high rigidity by increasing the cross-sectional secondary moment in the portion forming the plurality of closed cross sections. For this reason, higher strength can be secured efficiently with respect to the impact load on the side portion.

  The seventh feature of the pillar structure of the vehicle according to the present invention is that the plurality of closed cross sections are partitioned so that respective cross sectional areas in a cross section perpendicular to the longitudinal direction of the upper portion are equal. It is that you are.

  According to this configuration, since the cross-sectional areas of the plurality of closed cross sections are configured to be equal, it is easy to ensure high rigidity by increasing the cross-sectional secondary moment in the portion forming the plurality of closed cross-sections. . For this reason, higher strength can be secured efficiently with respect to the impact load on the side portion.

  Further, an eighth feature of the vehicle pillar structure according to the present invention is that the upper facing portion is formed to extend along the longitudinal direction of the upper portion so as to partition the plurality of closed cross sections. It has a part.

  According to this configuration, since the plurality of closed cross sections are formed by the strips extending in the longitudinal direction, the strong load is efficiently exerted with respect to the impact load from the outside of the vehicle to the side portion to ensure higher strength. It is possible to easily realize a plurality of closed cross-sectional structures with a simple configuration.

  The ninth feature of the pillar structure of the vehicle according to the present invention is that the upper facing portion is disposed on both sides of the convex portion and a U-shaped convex portion that protrudes and contacts the upper portion. That is, the U-shaped concave portion formed in the chamber side is formed to have a continuous cross section.

  According to this configuration, by providing a U-shaped convex portion that is in contact with the upper portion and concave portions that are recessed on the passenger compartment side on both sides thereof, a shape that divides a plurality of closed cross sections with the upper portion The upper facing portion can be easily formed.

  The tenth feature of the pillar structure of the vehicle according to the present invention is that the lower part is thinner than the upper part, so that the lower part is more easily deformed than the upper part. It is formed as follows.

  According to this configuration, by making the plate thickness of the lower part thinner than the plate thickness of the upper part, it is possible to easily realize a structure in which the lower part is more easily deformed than the upper part.

  An eleventh feature of the pillar structure for a vehicle according to the present invention is that the lower portion is deformed more than the upper portion because the strength of the material of the lower portion is smaller than the strength of the material of the upper portion. It is formed so that it is easy to do.

  According to this configuration, by making the material strength of the lower portion smaller than the material strength of the upper portion, it is possible to easily realize a structure in which the lower portion is more easily deformed than the upper portion.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. The pillar structure of the vehicle according to the embodiment of the present invention forms a vertical frame portion that defines a door opening at a side portion of the vehicle, and is located above the vertical frame portion when an impact load is applied from the outside of the vehicle to the vehicle side portion. The present invention can be widely applied as a pillar structure formed so that the lower portion is more easily deformed than the lower portion.

  FIG. 1 is an exploded perspective view showing a pillar structure 1 (hereinafter simply referred to as “pillar 1”) of a vehicle according to the present embodiment. The pillar 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. Moreover, this pillar 1 is comprised as a sheet-metal component formed by press-molding flat plates, such as press molding.

  As shown in FIG. 1, the pillar 1 includes a pillar outer 11 that is a first reinforcing member, a pillar inner 12 that is a third reinforcing member, and a pillar reinforcement 13 that is a second reinforcing member. Yes. These are all formed as steel pressure-formed members.

  The pillar outer 11 is provided so as to connect an upper edge portion (roof side rail) 2 forming a door opening to a lower edge portion (rocker panel) (not shown) that forms a door opening in a vehicle body to which the pillar 1 is attached. The pillar outer 11 is configured to have an upper portion 14 that is a portion located above the center and a lower portion 15 that is a portion located below the center. The upper portion 14 is attached to the roof side rail 2 via an upper end attachment portion 14a. The lower portion 15 is formed integrally with the upper portion 14 and is attached to a rocker panel (not shown).

  Further, the lower portion 15 of the pillar outer 11 forms a space opened to the passenger compartment side, and is provided with a deformation inducing portion 24 that is formed so as to be more easily deformed than the upper portion 14. It has been. The deformation inducing portion 24 is formed to be more easily deformed than the upper portion 14 because the plate thickness of the deformation inducing portion 24 is thinner than the plate thickness of the upper portion 14. In addition, the deformation | transformation induction part 24 may be formed so that it may deform | transform easily by forming the upper part 14 and the deformation induction part 24 from a different material. For example, when the strength evaluation is performed using the tensile strength, the strength of the steel material constituting the lower portion 15 is smaller than the strength of the steel material constituting the deformation inducing portion 24, so that the deformation inducing portion 24 is more than the upper portion 14. Also, it may be formed so as to be easily deformed. Further, the deformation inducing portion 24 may be formed so as to be easily deformed by a combination of different plate thicknesses and materials. The pillar outer 11 having a structure in which different plate thicknesses and materials are combined in this way can be formed by, for example, a tailored blank. Since the lower portion 15 forms a space opened to the passenger compartment side, various parts such as door hinges and lock reinforcing parts (not shown), harnesses (electric wires) and the like can be disposed in this space. .

Further, the pillar outer 11 is formed so that its width dimension (dimension in the vehicle front-rear direction) gradually increases from the upper end part attached to the roof side rail 2 to the lower end part attached to the rocker panel. FIG. 2 shows a cross section taken along line II in a state where the members (11 to 13) are combined as the pillar 1. As shown in FIG. 2, the pillar outer 11 is formed as a U-shaped cross section that protrudes outward from the vehicle, and flange portions 14 b are provided on both sides in the width direction (vehicle longitudinal direction).

  The pillar inner 12 is attached to the pillar outer 11 and is attached to the passenger compartment side of the pillar outer 11. The pillar inner 12 is attached to the pillar outer 11 after a pillar reinforcement 13 described later is attached to the pillar outer 11. The pillar inner 12 is formed in a shape that covers the passenger compartment side of the lower portion 15 of the pillar outer 11, and is disposed at a position facing the lower portion 15. Further, the pillar inner 12 is appropriately formed with a plurality of holes 12a and 12b. The hole 12a is provided for installing a seat belt retractor (not shown), and the hole 12b is provided for reducing the weight.

  FIG. 3 is an enlarged perspective view showing the pillar reinforcement 13. As shown in FIG. 3, the pillar reinforcement 13 includes an upper facing portion 16 and a lower mounting portion 17. The upper facing portion 16 is disposed so as to face the upper portion 14 of the pillar outer 11. On the other hand, the lower attachment portion 17 is provided continuously with the upper facing portion 16 and attached to the lower portion 15 of the pillar outer 11.

  As shown in the cross-sectional view of FIG. 2, the upper facing portion 16 of the pillar reinforcement 13 is a cross section orthogonal to the longitudinal direction of the upper portion 14 between the upper portion 14 of the pillar outer 11 and a plurality of closed portions. It is formed so as to partition a cross section (hereinafter referred to as “a plurality of closed cross sections”) 18 (18a, 18b). The upper facing portion 16 is arranged such that the plurality of closed cross-sections 18 (18a, 18b) are aligned in the vehicle front-rear direction (in the direction of the double-headed arrow A in the figure) and along the vehicle side portion. Is formed. Further, the overall shape of the cross section (the cross section shown in FIG. 2) orthogonal to the longitudinal direction of the upper portion 14 formed by the upper portion 14 and the upper facing portion 16 is a line-symmetric shape. Furthermore, the plurality of closed cross sections 18 (18a, 18b) are partitioned so that the cross sectional areas in the cross section perpendicular to the longitudinal direction of the upper portion 14 are equal. That is, the upper portion 14 and the upper facing portion 16 are formed so that the closed cross section 18a and the closed cross section 18b have an equal cross sectional area.

  As shown in FIGS. 2 and 3, the upper facing portion 16 of the pillar reinforcement 13 is formed so as to extend along the longitudinal direction of the upper portion 14 of the pillar outer 11 so as to define a plurality of closed cross sections 18. It has a strip 19. The upper facing portion 16 is disposed on both sides of the U-shaped convex portion 20 protruding and in contact with the upper portion 14 and the width direction of the convex portion 20 (the direction of the arrow A in FIG. 2). A U-shaped concave portion 21 formed in a concave shape on the side is formed to have a continuous cross section. A flange portion 16 a is provided on the outer side of each concave portion 21 of the upper facing portion 16. The flange portion 16a is joined to the flange portion 14b of the upper portion 14 of the pillar outer 11 by spot welding or the like.

  FIG. 4 is a plan view of the pillar reinforcement 13 with the side opposite to that shown in FIG. 3 facing upward. FIG. 5 is an enlarged view showing a part of the pillar outer reinforcement 13 attached to the pillar outer 11. As shown in FIGS. 2 to 5, the upper facing portion 16 is provided with an upper adjacent portion 22 that is a portion formed so as to be adjacently disposed along the side surface 14 c on the passenger compartment side in the upper portion 14 of the pillar outer 11. It has been. The lower mounting portion 17 is formed along the side surface 15a of the lower portion 15 of the pillar outer 11 (see FIG. 5 and the like). And the lower side adjacent part 23 which is a part formed so that it may be adjacently arranged along the vehicle room side side 15a of the lower part 15 of the pillar outer 11 in the lower side attachment part 17 becomes the upper side adjacent part 22 gently. It is formed to be in a continuous state (see FIGS. 3 to 5). The upper facing portion 16 has a first U-shaped portion having a U-shaped cross section perpendicular to the longitudinal direction of the upper portion 14 and having an upper adjacent portion 22 forming a bottom side. It is formed by. On the other hand, the lower mounting portion 17 is formed with a second U-shaped portion having a U-shaped cross section that is perpendicular to the longitudinal direction of the upper portion 14 and in which the lower adjacent portion 23 forms the bottom. Has been. And the pillar reinforcement 13 is formed so that these 1st U-shaped part and 2nd U-shaped part may continue smoothly.

  Next, the effect of ensuring a sufficient strength and further reducing the weight by the configuration of the pillar 1 will be described based on the result confirmed by the simulation.

  Since the pillar 1 is also reduced in weight by significantly reducing the pillar inner 12, the upper portion 14 of the pillar outer 11 and the upper portion of the pillar reinforcement 13, which are portions where the pillar inner 12 is not provided in the pillar 1. The effect of achieving both strength and weight reduction was confirmed for the portion composed of the facing portion 16. FIG. 6 shows a calculation model used for confirmation in the simulation. As shown in FIG. 6, a load Fy is applied from the point A3 to the pillar structure 30 of various cross sections supported by the indenter having a curvature radius of 30 mm at the points A1 and A2 at a position 860 mm away from the point A3. An analysis was performed for the case. The pillar structure 30 was analyzed as having a cross section of the same shape in the longitudinal direction and curved with a curvature radius of 1310 mm. In the analysis, the allowable maximum load MAX-Fy and the mass per unit length of the pillar structure 30 (hereinafter referred to as the maximum displacement amount when the load Fy is applied to the pillar structure 30 are within a predetermined range). This was referred to as “cross-sectional weight”) to evaluate the effect of ensuring both strength and weight reduction.

  FIG. 7 schematically shows an example of the cross-sectional shape of the pillar structure 30 used for the analysis (the cross-sectional shape perpendicular to the longitudinal direction of the pillar structure). The “CASE1” shape shown in FIG. 7A includes a pillar outer upper portion 31a, a pillar inner 32a that is assumed to be disposed at a position facing the pillar outer upper portion 31a, a pillar outer upper portion 31a, and a pillar inner 32a. It is a calculation model provided with the pillar reinforcement 33a which divides a closed section further in the closed section formed. 7B includes a pillar outer upper portion 31b, a pillar inner 32b, and a pillar reinforcement 33b, and the “CASE3” shape illustrated in FIG. 7C has a pillar outer upper portion 31c and a pillar inner. 32c and pillar reinforcement 33c are provided, and the “CASE4” shape of FIG. 7D is provided with a pillar outer upper portion 31d pillar inner 32d and pillar reinforcement 33d. Further, the “BASE” shape of FIG. 7E corresponds to the prior art, and includes a pillar outer upper portion 31e, a pillar inner 32e, and a pillar reinforcement 33e shaped along the pillar outer upper portion 31e. Is. On the other hand, the “BASE-RF extension” shape of FIG. 7 (f) includes a pillar outer upper portion 31f, a pillar inner 32f, and pillar reinforcements 33f that are extended to a length at which both side portions reach the pillar inner 32f. Is. The shape of “without CASE1-INNER” shown in FIG. 7 (g) corresponds to the pillar 1 of the present embodiment, and includes a pillar outer upper portion 31g and a pillar reinforcement 33g, and the pillar outer upper portion 31g includes The pillar inner is not disposed at the facing position.

  Table 1 below illustrates the relationship between the cross-sectional weight and the calculation result of the allowable maximum load MAX-Fy when the plate thickness is changed. One example for the “BASE” shape and four examples for the “CASE1-without INNER” shape are shown, and the thickness of the pillar outer upper portion (OUTER) and the thickness of the pillar reinforcement (RF) are changed. An example is shown. Further, regarding the types of materials, the calculation was performed on the assumption that the strength of the upper portion of the pillar outer is T1, and the strength of the pillar reinforcement is T2. The strengths T1 and T2 were calculated on the assumption that the materials had mechanical properties according to the stress-strain curve shown in FIG.

  As shown in some examples in FIG. 7, the plate thickness conditions were changed for each of the cross-sectional shapes shown in FIG. 7, and the allowable maximum load MAX-Fy under each plate thickness condition was calculated. Based on the calculation results under a plurality of conditions obtained by changing the plate thickness, a regression equation indicating the correlation between the plate thickness and the allowable maximum load MAX-Fy is derived for each cross-sectional shape shown in FIG. did. FIG. 9 shows the calculation result of the allowable maximum load MAX-Fy when the plate thickness (t_outer) of the pillar outer upper portion and the plate thickness (t_RF) of the pillar reinforcement are changed in the “without CASE1-INNNER” shape and the following equation (1). The relationship with the calculation result of the allowable maximum load F by the regression equation shown in FIG. In the following equation (1), “a”, “b”, and “c” are coefficients in the regression equation, and “^” indicates a sign of a multiplier.

(Equation 1)
F = a * (t_outer) ^ b * (t_RF) ^ c (1)

  FIG. 10 shows the relationship between the plate thickness (t_outer) of the upper part of the pillar outer and the plate thickness (t_RF) of the pillar reinforcement, the cross-sectional weight W (unit: kg), and the allowable maximum load F based on the regression equation (1). It is shown. That is, the sectional weight W and the allowable maximum load F are shown as an equivalent diagram with respect to the thickness of the upper portion of the pillar outer and the thickness of the pillar reinforcement. Note that FIG. 10 shows an example of the case of “without CASE1-INNER”, under the conditions set so that the ratio of the surface area of the pillar outer upper portion 31a and the pillar reinforcement 33a is 1: 1. It is the result calculated by.

  Table 2 below shows an equivalent diagram of the cross-sectional weight W and the permissible maximum load F as illustrated in FIG. 10 for each cross-sectional shape shown in FIG. 7, and based on this, the permissible maximum load F is the same at 25000N. The sectional weight W corresponding to each sectional shape is obtained. Table 3 below shows the cross-section when the maximum allowable load F is the same for all “BASE” and “No CASE-INNER” shapes with the same maximum allowable load F of 60000N (the maximum allowable load corresponding to the side collision standard in the IIHS standard). The weight W is obtained. In Tables 1 and 2, the two types of cases of the case where the ratio of the surface area of the pillar outer upper portion 31a and the pillar reinforcement 33a is 1: 1 and 1.5: 1 were confirmed.

  11 and 12 show the results of Tables 1 and 2 in comparison with bar graphs, respectively. As shown well in FIGS. 11 and 12, in the case of the cross-sectional shape of FIG. 7G corresponding to a portion constituted by the upper portion 14 of the pillar outer 11 and the pillar reinforcement 13 in the pillar 1 of the present embodiment, It was confirmed that the most weight reduction could be achieved while securing the same strength as compared with the other cross-sectional shapes shown in FIGS. In particular, when the maximum allowable load F is as large as 60000 N, it has been confirmed that significant weight reduction can be achieved while securing the same strength as the “BASE” shape of FIG. (See FIG. 12).

  As described above, according to the pillar 1 of the present embodiment, the pillar outer 11 that is the first reinforcing member having the upper portion 14 attached to the upper edge portion of the door opening and the lower portion 15 attached to the lower edge portion, A pillar structure of the vehicle is formed by including a pillar reinforcement 13 which is a second reinforcing member having an upper facing portion 16 facing the upper portion 14 and a lower mounting portion 17 attached to the lower portion 15. . For this reason, there are few points of the member used as a component, and the weight reduction of the pillar structure of a vehicle is achieved. And the pillar reinforcement 13 which is a 2nd reinforcement member is formed and arrange | positioned so that the upper side opposing part 16 may define the some closed cross section 18 between the upper part 14 of the pillar outer 11, and the A lower attachment portion 17 is formed and attached along the side surface 15 a on the passenger compartment side of the lower portion 15 of the pillar outer 11. For this reason, high rigidity can be ensured by the pillar reinforcement 13, and sufficient strength can be ensured with a small amount of material compared to the conventional pillar structure configured as a cylindrical closed section. Therefore, with respect to the pillar structure in which the lower portion is more easily deformed than the upper portion of the vertical frame portion of the door opening when an impact load is applied from the outside of the vehicle to the side portion of the vehicle, sufficient strength is secured. Further weight reduction can be achieved.

  Further, according to the pillar 1, the pillar inner 12 as the third reinforcing member is disposed at a position facing the lower portion 15 of the pillar outer 11, and disposed at a position facing the upper portion 14. It is not carried out and the member of the part is abbreviate | omitted. For this reason, by adding the lightweight pillar inner 12, it is possible to further improve the strength while suppressing an increase in weight. Also, the pillar inner 12 can be used as a support member for supporting the seat belt retractor.

  Further, according to the pillar 1, the upper facing portion 16 is provided with the upper adjacent portion 22 along the upper portion 14, and the lower mounting portion 17 is provided with the lower adjacent portion 23 along the lower portion 15. Both these adjacent portions (22, 23) are formed so as to be smoothly continuous. For this reason, since the pillar outer 11 and the pillar reinforcement 13 are integrally configured via both adjacent portions (22, 23), the shape having the plurality of closed cross sections 18 is easily stabilized, and high rigidity is easily secured. . Therefore, it is possible to easily form the pillar reinforcement 13 that forms a plurality of closed cross-sections 18 with the upper portion 14 and is attached so as to straddle along the lower portion 15 to ensure high rigidity. .

  Further, according to the pillar 1, a plurality of closed cross sections 18 are arranged side by side in the direction along the side portion in the vehicle front-rear direction, so that a strong proof strength is efficiently exhibited against an impact load from the outside of the vehicle to the side portion. Therefore, higher strength can be ensured. In the pillar 1, the shape having a plurality of closed cross sections 18 is configured as a line symmetrical shape, and the cross sectional areas of the plurality of closed cross sections 18 are also configured to be equal. For this reason, it becomes easy to ensure high rigidity by increasing the cross-sectional secondary moment in the portion forming the plurality of closed cross-sections 18, and it is possible to efficiently ensure higher strength against impact loads on the side portions. it can.

  Further, according to the pillar 1, since the plurality of closed cross sections 18 are formed by the strips 19 extending in the longitudinal direction, the pillar 1 efficiently exhibits a strong proof strength against an impact load from the outside to the side and is higher. A plurality of closed cross-sectional structures that can ensure strength can be easily realized with a simple configuration. In the pillar 1, a plurality of closed portions are formed between the upper portion 14 and the upper portion 14 by providing a U-shaped convex portion 20 that is in contact with the upper portion 14 and concave portions 21 that are recessed on both sides of the pillar 1. The upper facing portion 16 having a shape that defines the cross section 18 can be easily formed.

  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. For example, the third reinforcing member is not necessarily required. In addition, the shape of the plurality of closed cross sections defined between the upper portion of the first reinforcing member and the upper facing portion of the third reinforcing portion is not limited to the shape described in the present embodiment, and may be changed as appropriate. Can be implemented. Further, the shape of the lower mounting portion may be appropriately changed and implemented.

It is a disassembled perspective view which shows the pillar structure of the vehicle which concerns on embodiment of this invention. It is II sectional view taken on the line of FIG. 1, Comprising: It is sectional drawing in the state in which each part was combined as a pillar structure. It is a perspective view which expands and shows the 3rd reinforcement member shown in FIG. FIG. 4 is a plan view of a third reinforcing member shown in FIG. 3, with the side opposite to the side shown in FIG. 3 facing up. It is a figure which expands and shows a part of state in which the 3rd reinforcement member was attached to the 1st reinforcement member shown in FIG. It is a figure explaining the calculation model used in order to analyze the relationship between the intensity | strength and weight in a pillar structure. 7 schematically shows an example of a cross-sectional shape of the pillar structure shown in FIG. It is the figure which showed the stress-strain curve used in the analysis of the relationship between the intensity | strength and weight in a pillar structure. It is a figure explaining the regression formula of the allowable maximum load which used the board thickness of the member in a pillar structure as a parameter. It is a figure which illustrates the result of having calculated | required the relationship between the intensity | strength and weight in a pillar structure. It is a figure which compares and shows the difference in the weight by the difference in cross-sectional shape in the pillar structure with the same intensity | strength. It is a figure which compares and shows the difference in the weight by the difference in cross-sectional shape in the pillar structure with the same intensity | strength.

Explanation of symbols

1 Pillar structure of vehicle 11 Pillar outer (first reinforcing member)
13 Pillar reinforcement (second reinforcing member)
14 Upper part 15 Lower part 16 Upper facing part 17 Lower mounting part 18, 18a, 18b Closed cross section 24 Deformation inducing part

Claims (11)

It is a sheet metal part formed by pressure-molding a flat plate, and forms a vertical frame part that defines a door opening in a side part of a vehicle, and when an impact load is applied from the outside to the side part. In the pillar structure of the vehicle formed so that the lower part is more easily deformed than the upper part of the vertical frame part,
A first reinforcing member for connecting an upper edge portion and a lower edge portion forming the door opening, wherein the upper portion is attached to the upper edge portion and the lower portion is attached to the lower edge portion. And the lower part is formed integrally with the upper part and forms a space open to the passenger compartment side, and the lower part is more easily deformed than the upper part. A first reinforcing member provided with a deformation inducing portion which is a portion formed as described above,
A second reinforcing member having an upper facing portion disposed so as to face the upper portion, and a lower mounting portion provided continuously to the upper facing portion and attached to the lower portion; ,
With
The upper facing portion is a cross section perpendicular to the longitudinal direction of the upper portion between the upper portion and is formed so as to define a plurality of closed cross sections.
The lower mounting portion is formed so as to extend along a side surface on the passenger compartment side in the lower portion.   The third reinforcing member attached to the passenger compartment side with respect to the first reinforcing member and further disposed at a position facing the lower portion. Vehicle pillar structure. The upper facing portion is provided with an upper adjacent portion which is a portion formed so as to be adjacently disposed along the side surface on the passenger compartment side in the upper portion,
A lower adjacent portion which is a portion formed so as to be adjacently disposed along a side surface on the passenger compartment side of the lower portion in the lower attachment portion is smoothly continuous with the upper adjacent portion. The pillar structure of the vehicle according to claim 1 or 2. The upper facing portion is formed with a first U-shaped portion having a U-shaped cross section that is a cross section perpendicular to the longitudinal direction of the upper portion and the upper adjacent portion forms a bottom side,
The lower mounting portion is formed with a second U-shaped portion having a U-shaped cross section that is a cross section perpendicular to the longitudinal direction of the upper portion, and the lower adjacent portion forms a base,
The pillar structure of a vehicle according to claim 3, wherein the first U-shaped portion and the second U-shaped portion are smoothly continuous.   The upper facing portion is formed so that the plurality of closed cross sections are arranged side by side in a longitudinal direction of the vehicle and along the side portion. 5. The vehicle pillar structure according to claim 4.   6. The vehicle pillar structure according to claim 5, wherein an overall shape of a cross section perpendicular to the longitudinal direction of the upper portion formed by the upper portion and the upper facing portion is a line-symmetric shape.   The vehicle according to claim 5 or 6, wherein the plurality of closed cross sections are partitioned so that respective cross sectional areas in a cross section orthogonal to a longitudinal direction of the upper portion are equal. Pillar structure.   The said upper side opposing part has the strip | line part formed so that it might extend along the longitudinal direction of the said upper part so that these several closed cross sections might be defined. The pillar structure of a vehicle according to any one of 7.   The upper facing portion includes a U-shaped convex portion that protrudes and contacts the upper portion, and a U-shaped concave portion that is disposed on both sides of the convex portion and is recessed on the passenger compartment side. 9. The vehicle pillar structure according to claim 5, wherein the vehicle pillar structure is formed to have a cross section.   The thickness of the said deformation | transformation induction part is thinner than the board thickness of the said upper part, The said lower part is formed so that it may deform | transform easily rather than the said upper part. 10. The vehicle pillar structure according to claim 9. 2. The device according to claim 1, wherein the lower portion is formed to be more easily deformed than the upper portion because the strength of the material of the deformation inducing portion is smaller than the strength of the material of the upper portion. The pillar structure of the vehicle according to claim 10.

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