JP2009292367A - Center pillar structure of two-door vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alleviate injury of a chest part and a head part of an occupant due to bent deformation of a center pillar upon side collision by setting the bent deformation caused by bending stress of the center pillar to occur at a height position where sufficient cross section bending resistance to cross section bending input is obtained. <P>SOLUTION: A reinforcement panel 3, a center pillar inner panel 4, two reinforcements 8, 9 disposed between the reinforcement panel and the center pillar inner panel are jointed with joint flanges 5, 7 at a vehicle front side and a vehicle rear side to form a closed section shape for the square-shaped center pillar 1. A position where a valley-folded ridge line RL1 at a bent section positioned in a vehicle outer side direction of the joint flange 7 placed on the rear side of the vehicle and a mountain-folded ridge line RL2 at a bent section positioned on a vehicle rear side of the reinforcement panel 3 and in a vehicle outer side direction is set lower than a belt line BL. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a center pillar structure of a two-door vehicle, and more particularly to a center pillar structure of a two-door vehicle that realizes a reinforcing structure that reduces bending deformation at the time of a side collision.

  A two-door type automobile (including a so-called three-door car provided with a back door on the rear surface) includes one side door (not shown) on each side of the vehicle body. As shown in FIG. 6, a center pillar 51 is provided on the rear side. A roof side 52 is formed in the upper part of the center pillar 51 in front of the vehicle, a rocker 53 is formed in the lower part of the center pillar 51 in front of the vehicle, and a side door is formed in a space defined by the center pillar 51, the roof side 52 and the rocker 53. Is configured to fit in an openable and closable manner. Further, a roof side rear 54 is formed in the upper part of the center pillar 51 at the rear of the vehicle, and a quarter panel 55 is formed at the rear of the center pillar 51 below the belt line BL. The center pillar 51, the roof side rear 54, and the quarter panel are formed. The fixing window glass 56 is fixed in a space defined by 55. The belt line BL refers to the boundary between the door panel of the side door and the door glass.

  As shown in FIGS. 6, 7A and 7B, the center pillar 51 has a lean reinforcement panel 67 and a center pillar inner panel 62 arranged on the back side of the quarter panel 55, and side doors. It is joined at the front side of the vehicle by the joining flange 63 together with the quarter panel 55, and joined at the joining flange 64 at the rear side of the vehicle where the fixing window glass 56 is arranged, so that the closed cross-sectional shape is a square shape having a closed space. (For example, refer to Patent Document 1 and Patent Document 2). Two reinforcements 65 and 66 are arranged between the reinforcement panel 67 and the center pillar inner panel 62. The lean force 65 is joined to the lean force panel 67, and the lean force 66 is joined to the center pillar inner panel 62. These two reinforcements 65 and 66 are for reinforcing the center pillar 51.

  As shown in FIG. 8A, the center pillar 51 configured in this way reduces bending deformation from the head of the occupant to the abdomen in the height direction when it is impacted from the side and receives a collision load. Therefore, by interposing the reinforcements 65 and 66, it becomes possible to make the cross-sectional bending proof stress higher than the cross-sectional bending input at the time of a side collision. By making the value of the cross-sectional bending strength higher than the value of the cross-sectional bending input at the time of a side collision, as shown in FIG. 8 (B), the abdomen from the occupant's head and the center pillar 51 subjected to the side collision The distance W can be secured, and damage to the upper body such as the chest and head of the occupant can be mitigated.

  6, 7 </ b> A, 8 </ b> B, 8 </ b> A, 9 </ b> B, 9 </ b> A, 9 </ b> B, arrow H indicates the height direction of the vehicle body, and arrow L indicates the vehicle body. The arrow W indicates the width direction of the vehicle body. Moreover, each figure has shown the left side surface of the vehicle body.

JP-A-8-216921 JP-A-10-167115

  However, in the structure of the center pillar 51 of the two-door vehicle described in the background art, since the fixing window glass 56 is fixed in the vicinity of the belt line BL, the center pillar 51 has an upper roof side as shown in FIG. The cross-sectional area (FIG. 7A) is narrower than the cross-sectional area on the lower floor side (FIG. 7B). For this reason, as shown in FIG. 9A, when the center pillar 51 is collided from the side and receives a collision load, bending deformation occurs in the vicinity of the belt line BL that becomes vulnerable to bending stress. At the position, the actual bending strength of the cross section is lower than the cross section bending input at the time of a side collision. In the case of a two-door vehicle, this belt line BL is often the position of the passenger's chest. Therefore, as shown in FIG. 9B, the relative distance between the chest and the abdomen of the occupant and the center pillar 51 that has undergone a side collision is reduced, which may damage the occupant's chest and head.

  In a two-door vehicle, a space defined by a center pillar 51 for fixing a fixing window glass 56, a roof side rear 54, and a quarter panel 55 in order to ensure a passenger's field of view and a rear seat getting-on / off performance. There was a limit to increasing the area.

  The present invention has been made to solve such a conventional difficulty, and a center of a two-door vehicle that can alleviate injury to an occupant's chest and head due to bending deformation of the center pillar at the time of a side collision. The object is to provide a pillar structure.

  The center pillar structure of the two-door vehicle that is the first aspect of the present invention that achieves the above-described object is that the lean reinforcement panel disposed on the vehicle outer side and the center pillar inner panel disposed on the vehicle inner side include the side door. The vehicle is disposed on the front side of the vehicle and on the rear side of the vehicle on which the fixing window glass is disposed, and is joined to each other by a joint flange to form a square center pillar with a closed cross-section, and further disposed on the rear side of the vehicle. The joining flange is a center pillar structure of a two-door type automobile that is arranged in the middle of one side of the center pillar on the vehicle rear side up to a predetermined height position from the floor side, and is arranged on the vehicle rear side. A fold ridge line of a bent portion located in the vehicle outer direction of the connecting flange, a vehicle rear side of the reinforcement panel and the vehicle Position where the mountain fold edge line portions bent positioned laterally coalesce is below the belt line is the door panel and the boundary between the door glass of the side door.

  Further, the center pillar structure of the two-door vehicle according to the second aspect of the present invention that achieves the above-mentioned object has a lean reinforcement panel disposed on the vehicle outer side and a center pillar inner panel disposed on the vehicle inner side. The front side of the vehicle where the door is arranged and the rear side of the vehicle where the fixing window glass is arranged are joined to each other by a joining flange to form a square pillar with a closed cross section, and the center pillar is reinforced. Therefore, at least one or more reinforcements are disposed between the reinforcement panel and the center pillar inner panel, and the joining flange disposed on the vehicle rear side rises from the floor side to a predetermined height position. Is a two-door type vehicle arranged in the middle of one side of the center pillar on the vehicle rear side It is a center pillar structure, and the valley fold ridge line of the bending part located in the vehicle outside direction of the joint flange arranged on the vehicle rear side, and the mountain of the bending part located in the vehicle rear side and the vehicle outside direction of the reinforcement panel The position where the folding ridge line is combined is below the belt line which is the boundary between the door panel of the side door and the door glass.

  According to the center pillar structure of the two-door vehicle which is the first aspect or the second aspect as described above, the valley fold ridge line of the folding portion located in the vehicle outer direction of the joint flange disposed on the vehicle rear side, and the lean The position where the mountain ridge line of the folding part located on the vehicle rear side and the vehicle outer side of the force panel is set below the belt line that is the boundary between the door panel of the side door and the door glass. If the stress concentration position is set below the belt line, which is the aggregate position of the two ridge lines, the bending deformation due to the bending stress of the center pillar is set to a height position that provides sufficient bending resistance for the section bending input. Since it can set, the relative distance of the center pillar and the side door which received the side collision from the passenger | crew's head and abdominal part can be ensured. Therefore, damage to the chest and head of the occupant can be alleviated. The cross-sectional bending input means an impact load on the cross section.

  The third aspect of the present invention is the center pillar structure of the two-door vehicle according to the second aspect, wherein the position where the valley fold ridge line and the mountain fold ridge line are merged is a side collision according to the Safety Standard Article 18 of the Road Transport Vehicle Law. When the moving barrier used in the side impact test based on the reference collides, the numerical value of the proof stress accompanying the cross-sectional deformation of the center pillar is a position where the numerical value of the cross-sectional bending input by the moving barrier is equal to or greater. According to the center pillar structure of the two-door vehicle which is the third aspect as described above, it is possible to cope with a side collision test in which an actual situation of an automobile accident is analyzed and reflected.

  According to the center pillar structure of the two-door vehicle of the present invention, the bending deformation due to the bending stress of the center pillar is set at a height position where the value of the cross-sectional bending strength has a margin with respect to the value of the cross-sectional bending input. Injuries to the occupant's chest and head due to bending deformation of the center pillar during a side collision can be mitigated.

  The best mode for carrying out the center pillar structure of a two-door vehicle of the present invention will be described below with reference to the drawings. 1 (A), (B), (C), (D), (E), FIG. 2, FIG. 3, FIG. 4, FIG. 5 (A), (B), the arrow H indicates the height of the vehicle body. The arrow L indicates the longitudinal direction of the vehicle body, and the arrow W indicates the width direction of the vehicle body. Each figure shows the left side surface of the vehicle body, but the right side surface has the same configuration, and the description thereof is omitted.

  The center pillar to which the center pillar structure of the two-door vehicle of the present invention is applied is disposed on the back side of the quarter panel 2 as shown in FIGS. 1 (A), (B), (C), (D), and (E). The reinforcement panel 3 positioned on the vehicle outer side and the center pillar inner panel 4 positioned on the vehicle inner side are joined to each other by a connecting flange 5 on the vehicle front side where a side door (not shown) is arranged. It is joined by the side edge flange 7 on the vehicle rear side where the window glass 6 is disposed, and the closed cross-sectional shape is formed in a square shape having a closed space. Further, two reinforcements 8 and 9 are disposed between the reinforcement panel 3 and the center pillar inner panel 4. These two reinforcements 8 and 9 are for reinforcing the center pillar 1. In addition, arrangement | positioning means providing in each position. One lean force 8 is joined to the quarter panel 2 together with the lean force panel 3, and the other lean force 9 is joined to the center pillar inner panel 4. In FIG. 1A, the quarter panel 2 is omitted for convenience.

  Further, as shown in FIGS. 2 and 3, such a center pillar 1 is provided so that the reinforcement panel 3 and the center pillar inner panel 4 extend in a shape in which the width gradually increases from the floor side to the roof side. It has been. 2 shows the center pillar inner panel 4, the other reinforcement 9, the one reinforcement 8, and the reinforcement panel 3 from left to right, and FIG. 3 shows the left to right. The quarter panel 2, lean reinforcement panel 3, one lean reinforcement 8, the other lean reinforcement 9, and the center pillar inner panel 4 are shown.

  The lean reinforcement panel 3 has a cross-sectional shape and a plate thickness so that it can play a reinforcing role mainly against a collision load from a side surface against the vehicle. In the reinforcement panel 3, side edge flanges 3a and 3b for joining are formed on the vehicle front side and the vehicle rear side, respectively. In FIG. 2, the arrow L direction is the vehicle rear side.

  The center pillar inner panel 4 is integrated with a lower end 4d attached to the side member 10 and an upper end 4u attached to the roof rail 11. The center pillar inner panel 4 has side edge flanges 4a and 4b for joining on the vehicle front side and the vehicle rear side, respectively.

  Since one reinforcement 8 is provided mainly to increase the rigidity against side collision, as shown in FIGS. 2 and 3, the cross-sectional bending strength having a margin for the cross-sectional bending input in the side collision is obtained. It is formed to extend from the roof side to the floor side to the height position.

  The other reinforcement 9 is provided to increase the rigidity against side collision and also serves as a reinforcement for fixing the seat belt, so that the length on the floor side is shorter than the one reinforcement 8. ing. The other reinforcement 9 has side edge flanges 9a and 9b for joining on the vehicle front side and the vehicle rear side, respectively. Note that side flanges 9a and 9b for joining are formed on the front side and the rear side of the reinforcement 9 respectively.

  Such a center pillar 1 has a cross section AA shown in FIG. 1A, that is, a portion where the fixing window glass 6 is disposed, as shown in FIG. The side edge flange 2 a, the side edge flange 3 a of the lean reinforcement panel 3, the side edge flange 9 a of the other reinforcement 9, and the side edge flange 4 a of the center pillar inner panel 4 are joined to form a joint flange 5. . The joint flange 5 at this portion is disposed at an intermediate portion of one side of the center pillar 1 having a square closed cross-section in order to make the cross-sectional bending strength at the time of a side collision higher than the cross-section bending input at the time of a side collision. The center pillar 1 includes a side edge flange 2b of the quarter panel 2, a side edge flange 3b of the lean reinforcement panel 3, a side edge flange 9b of the other reinforcement 9 and a side edge of the center pillar inner panel 4 on the vehicle rear side. The flange 4b is joined and the joining flange 7 is formed. Since the fixing window glass 6 is fixed, the joint flange 7 of this part is disposed outside the vehicle at a part where the lower end portion of the fixing window glass 6 is fixed.

  Further, the center pillar 1 has a side edge flange of the quarter panel 2 on the front side of the vehicle as shown in FIG. 1 (D) at a cross-section JJ shown in FIG. 2a, the side edge flange 3a of the lean reinforcement panel 3, the side edge flange 9a of the other reinforcement 9 and the side edge flange 4a of the center pillar inner panel 4 are joined to form a joining flange 5. The joint flange 5 at this portion is disposed at an intermediate portion of one side of the center pillar 1 having a square closed cross-section in order to make the cross-sectional bending strength at the time of a side collision higher than the cross-section bending input at the time of a side collision. The center pillar 1 is formed by joining a side edge flange 3b of the lean reinforcement panel 3, a side edge flange 9b of the other reinforcement 9 and a side edge flange 4b of the center pillar inner panel 4 on the vehicle rear side. Is formed. The joint flange 7 of this part is arrange | positioned on the vehicle outer side similarly to the part where the window glass 6 for fixation is arrange | positioned.

  In addition, the center pillar 1 has a section BB shown in FIG. 1A, that is, a portion below the section JJ where the quarter panel portion has high rigidity, as shown in FIG. The side edge flange 2 a of the quarter panel 2, the side edge flange 3 a of the lean reinforcement panel 3, the side edge flange 9 a of the other reinforcement 9, and the side edge flange 4 a of the center pillar inner panel 4 are joined to form a joining flange 5. Is formed. The joint flange 5 at this portion is disposed at an intermediate portion of one side of the center pillar 1 having a square closed cross-section in order to make the cross-sectional bending strength at the time of a side collision higher than the cross-section bending input at the time of a side collision. The center pillar 1 is formed by joining a side edge flange 3b of the lean reinforcement panel 3, a side edge flange 9b of the other reinforcement 9 and a side edge flange 4b of the center pillar inner panel 4 on the vehicle rear side. Is formed. The joint flange 7 at this portion is disposed at an intermediate portion of one side of the center pillar 1 having a square closed cross section so that the cross-sectional bending strength at the time of a side collision is higher than the cross-sectional bending input at the time of a side collision.

  Further, as shown in FIGS. 1B, 3 and 4, the center pillar 1 includes a valley fold ridge line RL1 of a bending portion located on the vehicle outer side of the joint flange 7 disposed on the vehicle rear side, and a lean force. The position at which the mountain ridge line RL2 of the bent portion located on the rear side of the vehicle panel 3 and in the vehicle outer side is combined is set below the belt line BL. In FIG. 1 and FIG. 4, the valley fold line RL1 and the mountain fold line RL2 are indicated by bold lines.

  The center pillar structure configured as described above is arranged on the vehicle rear side of the center pillar 1 because the fixing window glass 6 is fixed in a space defined by the center pillar 1, the roof side rear 11 </ b> A and the quarter panel 2. The connecting flange 7 is disposed outside the vehicle at a portion where the lower end portion of the fixing window glass 6 is fixed. In this case, the valley fold ridge line RL1 of the bending portion located in the vehicle outer side direction of the joint flange 7 disposed in the middle portion of one side of the center pillar 1 on the vehicle rear side, the vehicle rear side of the reinforcement panel 3 and the vehicle By joining the mountain fold ridge line RL2 of the bent part located in the outer direction to the lower end of the fixing window glass 6, the joining flange 7 arranged on the vehicle rear side is arranged on the vehicle outer side, and the fixing window glass It must be possible to fix the lower end of 6.

  However, the valley fold ridge line RL1 of the bending portion located in the vehicle outer direction of the joint flange 7 arranged on the vehicle rear side, and the mountain fold ridge line of the bending portion located in the vehicle rear side and the vehicle outer side of the reinforcement panel 3 are arranged. As shown in FIG. 5, since the two ridge lines RL1 and RL2 are aggregated into one at the position where the RL2 is combined, the stress as indicated by the arrows is concentrated at the aggregation point of the ridge lines RL1 and RL2 at the time of a side collision. It will be. This greatly affects the bending deformation at the time of the side collision of the center pillar 1. In FIG. 5, the valley fold line RL1 and the mountain fold line RL2 are indicated by thick lines.

  Therefore, the valley fold ridge line RL1 of the bent portion located in the vehicle outer direction of the joint flange 7 arranged on the vehicle rear side, and the mountain fold ridge line of the bent portion located in the vehicle rear side and the vehicle outer side of the reinforcement panel 3 are arranged. By setting the position where RL2 is united below belt line BL, the bending deformation position at the time of side collision of center pillar 1 is changed. When the stress concentration position is set below the belt line BL, which is the aggregate position of the two ridge lines RL1 and RL2, the bending deformation due to the bending stress of the center pillar 1 is marginal with respect to the cross-sectional bending input as shown in FIG. Therefore, it is possible to prevent the actual cross-sectional bending proof stress accompanying the cross-sectional deformation from becoming lower than the cross-sectional bending input. Therefore, the relative distance between the occupant's head and the abdomen and the center pillar subjected to the side collision can be ensured, so that damage to the occupant's chest and head can be mitigated.

  Further, a valley fold ridge line RL1 of the bent portion located in the vehicle outer direction of the joint flange 7 arranged on the vehicle rear side, and a mountain fold ridge line of the bent portion located in the vehicle rear side and the vehicle outer side of the reinforcement panel 3 are arranged. Since the position where the RL 2 is combined is only lower than the position where the lower end portion of the fixing window glass 6 is fixed, it is divided by the center pillar 1, the rear pillar 11 A and the quarter panel 2 for fixing the fixing window glass 6. There is no need to increase the area of the space to be lowered and lower the belt line BL.

  Such a center pillar structure is located on the vehicle rear side of the center pillar outer panel 3 and on the vehicle outer side direction, and the valley fold ridge line RL1 of the bent portion located in the vehicle outer direction of the joint flange 7 disposed on the vehicle rear side. When the moving barrier used in the side collision test based on the side collision standard according to the Safety Standard Article 18 of the Road Transport Vehicle Law collides with the position where the mountain ridge line RL2 of the bent part is combined, the cross-sectional deformation of the center pillar 1 It is preferable to set it at a position where the numerical value of the proof stress associated with is equal to or greater than the numerical value of the cross-sectional bending input by the moving barrier. By setting in this way, it is possible to correspond to the side collision test that reflects and reflects the actual situation of automobile accidents, so injuries to the passenger's chest and head due to the center pillar's bending deformation at the time of side collision Mitigation can be handled appropriately.

  In the above-described embodiment, the center pillar is provided with the two reinforcements between the reinforcement panel and the center pillar inner panel. However, the present invention is not limited to this, and mainly the reinforcement panel and the center pillar inner panel. The center pillar structure of the present invention can also be applied.

  In other words, the reinforcement panel and the center pillar inner panel are joined at the joint flange on the vehicle front side where the side door is arranged and the vehicle rear side where the fixing window glass is arranged, respectively, and the closed cross-sectional shape is square The joint flange formed on the center pillar and further disposed on the rear side of the vehicle rises from the floor side to a predetermined height position and is disposed at an intermediate portion of one side of the center pillar on the rear side of the vehicle. Applicable to the center pillar structure of automobiles. In this center pillar structure, the valley ridge line of the bent part located in the vehicle outer direction of the joint flange arranged on the vehicle rear side, and the mountain fold of the bent part located in the vehicle rear side and the vehicle outer side of the reinforcement panel. The position where the ridge line is combined is set below the belt line that is the boundary between the door panel of the side door and the door glass. By comprising in this way, the effect | action and effect similar to the center pillar structure of the Example mentioned above can be acquired.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the example of preferable embodiment in the center pillar structure of the 2-door vehicle of this invention, (A) is a side view of a center pillar, (B) is sectional drawing which looked at the center pillar from the vehicle rear side, (C) (A) is AA sectional view, (D) is JJ sectional view of (A), (E) is BB sectional view of (A). FIG. 2 is an exploded explanatory diagram illustrating a state in which each component of the center pillar in FIG. 1 is viewed from a side surface outside the vehicle. FIG. 2 is an exploded explanatory diagram illustrating a state in which each component of the center pillar in FIG. 1 is viewed from the vehicle rear side. The diagram on the right shows the state of the relationship between the center pillar and the seat on which the occupant is seated, as seen from the rear of the vehicle.The graph on the left shows the cross-sectional bending input and the cross-sectional bending strength at the side collision of the right center pillar. It is explanatory drawing which shows a relationship. It is a fragmentary perspective view which shows the state of stress concentration when two ridgelines which are the bending parts of a center pillar unite. It is a side view which shows the side surface of the vehicle of the center pillar vicinity. It is a figure which shows the conventional center pillar, (A) is AA sectional drawing of FIG. 6, (B) is BB sectional drawing of FIG. (A) is a diagram showing the rigidity of the center pillar, the right diagram is an explanatory diagram showing the relationship between the center pillar and the seat on which the occupant is seated as viewed from the rear side of the vehicle, and the left graph is the right center pillar. It is explanatory drawing which shows the relationship between the cross-sectional bending input at the time of a side collision, and a cross-sectional bending proof stress, (B) is explanatory drawing which shows the relative distance of the center pillar which received the side collision from the passenger | crew's head. It is a figure which shows the rigidity of the conventional center pillar, (A) is an explanatory view which shows the state which looked at the relationship between the center pillar and the seat which a passenger | crew seats from the vehicle rear side, and the graph on the left is the center on the right FIG. 4B is an explanatory diagram showing a relationship between a cross-sectional bending input and a cross-sectional bending strength at the time of a side collision of a pillar, and FIG. .

Explanation of symbols

1 …… Center pillar 3 …… Lean force panel 4 …… Center pillar inner panel 5 …… Joint flange on the front side of the center pillar 6 …… Fixing window glass 7 …… Joint flange on the rear side of the center pillar on the vehicle 8... One lean reinforcement 9... Lean reinforcement RL 1 .. Valley ridge line of the bending portion located in the vehicle outer side of the joint flange disposed on the vehicle rear side of the center pillar RL 2. Mountain fold ridge line at the folding part located on the rear side of the panel and on the outer side of the vehicle BL ...... Belt line

Claims (3)

Reinforcement panel arranged on the vehicle outer side and center pillar inner panel arranged on the vehicle inner side are joined flanges on the vehicle front side where the side door is arranged and the vehicle rear side where the fixing window glass is arranged, respectively. Are joined to each other and formed into a square center pillar with a closed cross-sectional shape, and the joining flange disposed on the rear side of the vehicle rises from the floor side to the predetermined height position to the rear side of the center pillar. It is a center pillar structure of a two-door type car arranged in the middle of one side,
A valley fold ridge line of a bent portion located in the vehicle outer direction of the joint flange disposed on the vehicle rear side, and a mountain fold ridge line of a bent portion located in the vehicle rear side and the vehicle outer side of the lean reinforcement panel. The center pillar structure of a two-door type automobile is characterized in that the uniting position is below a belt line that is a boundary between the door panel of the side door and the door glass. Reinforcement panel arranged on the vehicle outer side and center pillar inner panel arranged on the vehicle inner side are joined flanges on the vehicle front side where the side door is arranged and the vehicle rear side where the fixing window glass is arranged, respectively. To form a square center pillar having a closed cross-sectional shape, and at least one or more reinforcements are disposed between the reinforcement panel and the center pillar inner panel to reinforce the center pillar. Further, the joint flange disposed on the vehicle rear side is raised from the floor side to a predetermined height position, and is disposed at an intermediate portion on one side of the center pillar on the vehicle rear side. The center pillar structure of
A valley fold ridge line of a bent portion located in the vehicle outer direction of the joint flange disposed on the vehicle rear side, and a mountain fold ridge line of a bent portion located in the vehicle rear side and the vehicle outer side of the lean reinforcement panel. The center pillar structure of a two-door type automobile is characterized in that the uniting position is below a belt line that is a boundary between the door panel of the side door and the door glass.   The position at which the valley fold line and the mountain fold line are merged is determined when the moving barrier used in the side collision test based on the side collision standard according to the Safety Standard Article 18 of the Road Transport Vehicle Act collides with the center pillar. 3. The center pillar structure of a two-door vehicle according to claim 2, wherein the value of the proof stress accompanying the cross-sectional deformation is a position where the numerical value of the cross-sectional bending input by the moving barrier is greater than or equal to.

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