Patent Publication Number: US-2022212722-A1

Title: Body side panel

Description:
TECHNICAL FIELD 
     The present invention relates to body side panels for automobiles. More specifically, the present invention relates to a body side panel including one metal panel and another metal panel that are reinforced with a resin member. 
     BACKGROUND ART 
     As an example of related-art body side panels, there is a body side panel disclosed under the title “IMPACT ENERGY ABSORBING STRUCTURE FOR VEHICLE” in Patent Literature 1. The body side panel disclosed in Patent Literature 1 has a structure including a center pillar portion in which an impact absorbing member is arranged between an outer panel and an inner panel. The impact absorbing member includes a plurality of ribs combined in matrix with each other, and is fixed to the inner panel with the ribs oriented to a side where the outer panel is present. 
     The ribs of this impact absorbing member include ones that have a main surface oriented in a front-and-rear direction and that are arranged at equal intervals, and other ones that have another main surface oriented in an upper-and-lower direction and that are arranged at equal intervals. With this, in case of side collision, impact energy is absorbed by deformation of the ribs. 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: Japanese Patent Application Laid-open No. 2017-019428 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     However, in the related-art body side panel as described above, due to the structure in which the impact absorbing member including the plurality of ribs at equal intervals is arranged in the center pillar, in case where a vehicle body has started to be deformed by the side collision, the outer panel unevenly strikes against the ribs. Thus, an advantage of absorbing impact may not be sufficiently implemented, and hence further improvement of enhancing an impact absorbing function has been demanded. 
     The present invention has been made in view of the circumstances in the related art as described above, and an object thereof is to enhance an impact absorbing function of a lightweight body-side panel including metal panels that are reinforced with a resin member. 
     Solution to Problem 
     According to the present invention, there is provided a body side panel including a center pillar portion that extends in a body upper-and-lower direction, a sill portion that extends in a body front-and-rear direction across a lower end portion of the center pillar portion, the body side panel including: 
     one metal panel that forms one main surface of the body side panel;
 
another metal panel
 
     that forms another main surface of the body side panel, and 
     that forms a space between the one metal panel and the other metal panel; and a resin member that is molded integrally with the one metal panel in the space. 
     The resin member of this body side panel includes, as ribs that protrude from a side where the one metal panel is present to a side where the other metal panel is present, 
     a link rib that continuously extends along a front edge of the center pillar portion, 
     another link rib that continuously extends along a rear edge of the center pillar portion, 
     a still-another link rib that continuously extends along an upper edge of the sill portion through an intersection region where the upper edge and the lower end of the center pillar portion intersect with each other, 
     a yet-another link rib that continuously extends along a lower edge of the sill portion through the intersection region where the lower edge and the lower end of the center pillar portion intersect with each other, and 
     a lower intersection rib that is arranged in the intersection region where the lower end portion of the center pillar portion and the sill portion intersect with each other. 
     In addition, in the body side panel, a clearance from a distal end portion of each of the link rib, the other link rib, the still-another link rib, and the yet-another link rib to the other metal panel is smaller than a clearance from a distal end portion of the lower intersection rib to the other metal panel. 
     Advantageous Effects of Invention 
     In the body side panel, in case of side collision, due to a structure of a vehicle body, high impact energy is applied mainly in a lower range of the center pillar portion. As a countermeasure, in the body side panel according to the present invention, the resin member integrated with the one metal panel includes the link ribs that continuously extend respectively along the front edge and the rear edge of the center pillar portion, and along the upper edge and the lower edge of the sill portion through the intersection region where the upper edge and the lower edge intersect with the lower end of the center pillar portion. In other words, the link ribs of the resin member are arranged continuously along a frame including the center pillar portion and the sill portion, that is, form what is called a monocoque structure. In addition, the clearance from the distal end portion of each of the link ribs of the resin member to the other metal panel is set smaller than the clearance from the distal end portion of the intersection rib to the other metal panel. 
     Thus, in case where the body side panel of the present invention receives impact from an outside, an entirety of the body side panel receives energy of the impact, and both the metal panels are deformed. In conjunction therewith, the link ribs nearer the other metal panel deform or collapse first by striking against the other metal panel so as to primarily absorb the impact energy. Then, in the body side panel, the intersection rib of the resin member deforms or collapses by striking against the other metal panel so as to secondarily absorb the impact energy. 
     In such a way, the body side panel according to the present invention, which is provided as the lightweight body-side panel including the metal panels that are reinforced with the resin member, absorbs the impact energy by the side collision in two steps. With this, the impact absorbing function can be enhanced. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an explanatory exploded-perspective view of a body side panel. 
         FIG. 2  is an explanatory side view of an arrangement of main ones of ribs in the body side panel according to the present invention. 
         FIG. 3  is a cross-sectional view of a first embodiment, which is taken along arrows A-A in  FIG. 2 . 
         FIG. 4  is another cross-sectional view of the first embodiment, which is taken along arrows B-B in  FIG. 2 . 
         FIG. 5  is a cross-sectional view of a second embodiment, which is taken along the arrows A-A in  FIG. 2 . 
         FIG. 6  is another cross-sectional view of the second embodiment, which is taken along the arrows B-B in  FIG. 2 . 
         FIG. 7  is a cross-sectional view of a third embodiment, which is taken along the arrows A-A in  FIG. 2 . 
         FIG. 8  is another cross-sectional view of the third embodiment, which is taken along the arrows B-B in  FIG. 2 . 
         FIG. 9  is a cross-sectional view of a fourth embodiment, which is taken along the arrows A-A in  FIG. 2 . 
         FIG. 10  is another cross-sectional view of the fourth embodiment, which is taken along the arrows B-B in  FIG. 2 . 
         FIG. 11  is a cross-sectional view of a fifth embodiment, which is taken along the arrows A-A in  FIG. 2 . 
         FIG. 12  is another cross-sectional view of the fifth embodiment, which is taken along the arrows B-B in  FIG. 2 . 
         FIG. 13  is a cross-sectional view of a sixth embodiment, which is taken along the arrows A-A in  FIG. 2 . 
         FIG. 14  is another cross-sectional view of the sixth embodiment, which is taken along the arrows B-B in  FIG. 2 . 
         FIG. 15  is an explanatory view of intersection ribs according to a seventh embodiment of the present invention. 
         FIG. 16  is a main-part explanatory view of an eighth embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     First Embodiment 
     A body side panel BP illustrated in  FIG. 1  includes one metal panel (outer panel) P 1  that forms one main surface of the body side panel BP, another metal panel (inner panel) P 2  that forms another main surface of the body side panel BP and that forms a space between the one metal panel and the other metal panel, and a reinforcing resin member R that is molded integrally with the one metal panel P 1  in this space. 
     Although materials of the metal panels P 1  and P 2  are not limited, as an example, these metal panels are each made of an aluminum alloy that is advantageous in weight reduction, and are molded into a predetermined three-dimensional shape by pressing of a blank material. Then, the metal panels P 1  and P 2  are joined to each other later by a step of spot welding or the like, and constitute the body side panel BP cooperatively with the resin member R. 
     Although a material of the resin member R is not limited, this resin member is a thermoplastic resin (CFRTP) containing discontinuous carbon fiber as a reinforcing material, and can be molded integrally with the one metal panel P 1  by injection molding or resin-press molding. The resin member R integrally includes a large number of reinforcing ribs that are formed out of welding spots and the like on a main surface of the one metal panel P 1 , the main surface facing the other metal panel P 2 , and that protrude to a side where the other metal panel P 2  is present. 
     As illustrated in  FIG. 2 , the body side panel BP according to this embodiment integrally includes a center pillar portion CP that extends in a body upper-and-lower direction, a sill portion SL that extends in a body front-and-rear direction across a lower end portion of the center pillar portion CP, and a roof side portion RS that extends in the body front-and-rear direction across an upper end portion of the center pillar portion CP. 
     Further, the body side panel BP integrally includes a front pillar portion FP that is arranged between a front end of the roof side portion RS and a front end of the sill portion SL and that extends in the body upper-and-lower direction, and a rear pillar portion RP that is arranged between a rear end of the roof side portion RS and a rear end of the sill portion SL and that extends in the body upper-and-lower direction. 
     Still further, the body side panel BP includes, respectively in front of and behind the center pillar portion CP, a front opening portion FH in which a front door is arranged, and a rear opening portion RH in which a rear door is arranged. In other words, the body side panel BP has a frame-like structure as a whole. Note that, although the resin member R includes the large number of ribs as illustrated in  FIG. 1 , for ease of understanding,  FIG. 2  illustrates, of the ribs, main ones that relate to the present invention. 
     The resin member R that constitutes the body side panel BP includes, as the ribs that protrude from a side where the one metal panel P 1  is present to the side where the other metal panel P 2  is present, a pillar front-link rib  11 A and a pillar rear-link rib  11 B that continuously extend respectively along a front edge and a rear edge of the center pillar portion CP, and a sill upper-link rib  12 A and a sill lower-link rib  12 B that continuously extend respectively along an upper edge and a lower edge of the sill portion SL through an intersection region where these edges and the lower end portion of the center pillar portion CP intersect with each other. In other words, the sill upper-link rib  12 A and the sill lower-link rib  12 B traverse this intersection region. Note that, the sill upper-link rib  12 A and the sill lower-link rib  12 B continuously extend over a range from a lower end portion of the front pillar portion FP to a lower end portion of the rear pillar portion RP via the lower end portion of the center pillar portion CP. 
     Further, the resin member R includes, as the ribs that protrude from the side where the one metal panel P 1  is present to the side where the other metal panel P 2  is present, a roof upper-link rib  13 A and a roof lower-link rib  13 B that continuously extend respectively along an upper edge and a lower edge of the roof side portion RS through an intersection region where these edges and the upper end portion of the center pillar portion CP intersect with each other. Note that, the pillar front-link rib  11 A and the pillar rear-link rib  11 B have upper end portions that are continuous with the roof lower-link rib  13 B, and have lower end portions that are continuous with the sill upper-link rib  12 A. 
     Still further, the resin member R includes a lower intersection rib  14  that is arranged in the intersection region where the lower end portion of the center pillar portion CP and the sill portion SL intersect with each other, and an upper intersection rib  15  that is arranged in the intersection region where the upper end portion of the center pillar portion CP and the roof side portion RS intersect with each other. 
     The lower intersection rib  14  and the upper intersection rib  15  include an at least one circular-arc intersection rib  14 A and an at least one circular-arc intersection rib  15 A each having a convex curved surface on a side where the center pillar portion CP is present, and an at least one straight rib  14 B and an at least one straight rib  15 B each arranged radially from a center of the convex curved surface. The lower intersection rib  14  of this embodiment includes two circular-arc ribs  14 A and  14 A that are concentric with each other around a sill lower side being a center of the circular arc, and two straight-intersection ribs  14 B and  14 B. 
     Meanwhile, the upper intersection rib  15  includes a single circular-arc rib  15 A around an upper side being a center of the circular arc, and two straight-intersection ribs  15 B and  15 B. These intersection ribs  14  ( 14 A and  14 B) and  15  ( 15 A and  15 B) intersect not only with each other, but also with the sill upper-link rib  12 A or the roof upper-link rib  13 A. 
       FIG. 3  is a cross-sectional view taken along arrows A-A in  FIG. 2 , that is, a cross-sectional view of the intersection region where the roof side portion RS and the center pillar portion CP intersect with each other. A cross-section of the roof side portion RS and a cross-section of the center pillar portion CP appear above and below.  FIG. 4  is another cross-sectional view taken along arrows B-B in  FIG. 2 , that is, a cross-sectional view of the intersection region where the center pillar portion CP and the sill portion SL intersect with each other. The cross-section of the center pillar portion CP and a cross-section of the roof side portion RS appear above and below. 
     In the cross-section illustrated in  FIG. 3 , the one metal panel P 1  has a cross-sectional shape that is opened to the side where the other metal panel P 2  is present. Specifically, the one metal panel P 1  includes a vertical wall portion Pa on an outer side of a vehicle body (on the right in the illustration), an upper wall portion Pb that extends from an upper end of the vertical wall portion Pa to an inner side of the vehicle body, a lower wall portion Pc that extends from a lower end of the vertical wall portion Pa to the inner side of the vehicle body, and a hanging wall portion Pd that continuously extends downward from a distal end of the lower wall portion Pc. 
     In the cross-section illustrated in  FIG. 3 , the other metal panel P 2  includes a vertical wall portion Pe, and an upper wall portion Pf that extends from an upper end of the vertical wall portion Pe to the inner side of the vehicle body. 
     In the cross-section illustrated in  FIG. 3 , the one metal panel P 1  and the other metal panel P 2  are joined to each other. Specifically, the upper wall portion Pf of the other metal panel P 2  is joined to a lower surface on a distal end side of the upper wall portion Pb of the one metal panel P 1 , and a lower end portion of the vertical wall portion Pe of the other metal panel P 2  is joined to the droop wall portion Pd of the one metal panel P 1 . With this, a space A is formed between the one metal panel P 1  and the other metal panel P 2  that have been joined to each other. 
     In the cross-section illustrated in  FIG. 4 , the one metal panel P 1  has a cross-sectional shape that is opened to the side where the other metal panel P 2  is present. Specifically, the one metal panel P 1  includes a vertical wall portion Pg on the outer side of the vehicle body (on the right in the illustration), an upper wall portion Ph that extends from an upper end of the vertical wall portion Pg to the inner side of the vehicle body, and an upper flange portion Pi that continuously extends upward from a distal end of the upper wall portion Ph. In addition, the one metal panel P 1  includes a lower wall portion Pj that extends from a lower end of the vertical wall portion Pg obliquely to the inner side of the vehicle body, and a lower flange portion Pk that continuously extends downward from a distal end of the lower wall portion Pj. 
     In the cross-section illustrated in  FIG. 4 , the other metal panel P 2  has a cross-sectional shape that is opened to the side where the one metal panel P 1  is present. Specifically, the other metal panel P 2  includes a vertical wall portion Pm on the inner side of the vehicle body (on the left in the illustration), an upper wall portion Pn that extends from an upper end of the vertical wall portion Pm to the outer side of the vehicle body, and an upper flange portion Po that continuously extends upward from a distal end of the upper wall portion Pn. In addition, the other metal panel P 2  includes a lower wall portion Pp that extends from a lower end of the vertical wall portion Pm to the outer side of the vehicle body, and a lower flange portion Pq that continuously extends downward from a distal end of the lower wall portion Po. 
     Note that, in the body side panel BP, a range of the vertical wall portion Pm, the upper wall portion Pn, and the lower wall portion Pp of the other metal panel P 2  correspond to the sill portion SL. In addition, in a structure of the body side panel BP of this embodiment, a clearance W 1  between the one metal panel P 1  and the other metal panel P 2  in the sill portion SL (width of the space A) is larger than a clearance W 2  between the one metal panel P 1  and the other metal panel P 2  in the center pillar portion CP. 
     In the cross-section illustrated in  FIG. 4 , the one metal panel P 1  and the other metal panel P 2  are joined to each other. Specifically, the upper flange portion Po and the lower flange portion Pq of the other metal panel P 2  are joined respectively to the upper flange portion Pi and the lower flange portion Pk of the one metal panel P 1 . With this, the space A is formed between the one metal panel P 1  and the other metal panel P 2  that have been joined to each other. The space A communicates all over the body side panel BP, and the resin member R is molded integrally with the one metal panel P 2  that constitutes one side of the body side panel BP (outer side of the vehicle body). 
     In addition, as illustrated in  FIG. 3  and  FIG. 4 , in the structure of the body side panel BP of this embodiment, a clearance S 1  from a distal end portion of each of the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B) to the other metal panel P 2  is smaller than a clearance S 2  from a distal end portion of each of the intersection ribs ( 14  and  15 ) to the other metal panel P 2 . In other words, the ribs each include its proximal end portion on a side where the vertical wall portions Pa and Pg of the one metal panel P 1  are present. Thus, in this structure, a protrusion dimension L 1  of each of the link ribs is larger than a protrusion dimension L 2  of each of the intersection ribs. 
     More specifically, as illustrated in  FIG. 3 , on a side where the roof side portion RS is present, the clearance S 1  from the distal end portion of each of the roof upper-link rib  13 A, the roof lower-link rib  13 B, and the pillar front-link rib  11 A to the other metal panel P 2  is smaller than the clearance S 2  from the distal end portion of the upper intersection rib  15  to the other metal panel P 2 . In addition, as illustrated in  FIG. 4 , on a side where the sill portion SL is present, the clearance S 1  from the distal end portion of each of the pillar rear-link rib  11 B, the sill upper-link rib  12 A, and the sill lower-link rib  12 B to the other metal panel P 2  is smaller than the clearance S 2  from the distal end portion of the lower intersection rib  14  to the other metal panel P 2 . 
     Note that, as illustrated in  FIG. 4 , in the body side panel BP of this embodiment, the clearance W 1  between both the metal panels P 1  and P 2  in the sill portion SL is larger than the clearance W 2  between both the metal panels P 1  and P 2  in the center pillar portion CP. In such a structure, size relationships between the clearances (S 1  and S 2 ) from the distal end portions of the ribs to the other metal panel P 2  may be partially inverted depending on size relationships between the clearances (W 1  and W 2 ) between the metal panels P 1  and P 2 . As a countermeasure, it is more desirable that the size relationships between the clearances (S 1  and S 2 ) from the distal end portions of the ribs to the other metal panel P 2  be set in each of the sill portion SL and the center pillar portion CP. 
     In the body side panel BP having the above-described structure, the resin member R integrated with the one metal panel P 1  includes the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B) that continuously extend respectively along the front edge and the rear edge of the center pillar portion CP, along the upper edge and the lower edge of the sill portion SL, and along the upper edge and the lower edge of the roof side portion RS. In other words, the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B) of the resin member R are arranged continuously over a longitudinal direction of a frame including the center pillar portion CP, the sill portion SL, and the roof side portion RS, that is, form what is called a monocoque structure. 
     In the body side panel BP, in case of side collision, due to the structure of the vehicle body, high impact energy is applied mainly in a lower range of the center pillar portion CP. Specifically, in the body side panel BP in an assembly of the vehicle body, cross members bridged in a right-and-left direction of the vehicle body are present respectively at a lower end portion (Q 1 ) in the front pillar portion FP and a lower end portion (Q 2 ) in the rear pillar portion RP illustrated in  FIG. 2 . Thus, in the body side panel BP, the lower end portions of the front pillar portion FP and the rear pillar portion RP are reinforced on a vehicle-body side against the side collision. In contrast, the lower end portion of the center pillar portion CP is lower in degree of reinforcement on the vehicle-body side than the other pillar portions FP and RP. Thus, the high impact energy is applied in the lower range. 
     In a case where the body side panel BP receives impact from an outside, an entirety of the monocoque structure constituted by the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B) receives energy of the impact. In this case, in the structure of the body side panel BP, the clearance S 1  from the distal end portion of each of the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B) to the other metal panel P 2  has been set smaller than the clearance S 2  from the distal end portion of each of the intersection ribs ( 14  and  15 ) to the other metal panel P 2 . 
     Thus, in the body side panel BP, the impact energy is received by the monocoque structure, and both the metal panels are deformed. In conjunction therewith, the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B) nearer the other metal panel P deform or collapse first by striking against the other metal panel P 2  so as to primarily absorb (release) the impact energy. Then, in the body side panel BP, the intersection ribs ( 14  and  15 ) of the resin member R deform or collapse by striking against the other metal panel P 2  so as to secondarily absorb (release) the impact energy. 
     In such a way, the body side panel BP is not only lightweight due to the reinforcement of the one metal panel P 1  and the other metal panel P 2  with the resin member R, but also absorbs the impact energy by the side collision in two steps. With this, an impact absorbing function can be enhanced. Further, in the body side panel BP of this embodiment, the similar rib structures are provided over and under the center pillar portion CP. Thus, the enhanced impact-absorbing function can be implemented not only at the lower end portion of the center pillar portion CP, to which the high impact energy is applied, but also both over and under the center pillar portion CP. As a result, contribution to increases in overall rigidity and safety can be made. 
     Still further, in the body side panel BP, the upper end portions of the pillar front-link rib  11 A and the pillar rear-link rib  11 B are continuous with the roof lower-link rib  13 B, and the lower end portions of the pillar front-link rib  11 A and the pillar rear-link rib  11 B are continuous with the sill upper-link rib  12 A. With this, in the body side panel BP, the enhanced impact-absorbing function can be secured, and in addition, the overall rigidity can be further increased. 
     Yet further, in the body side panel BP, the sill upper-link rib  12 A and the sill lower-link rib  12 B of the sill portion SL continuously extend over the range from the lower end portion of the front pillar portion FP to the lower end portion of the rear pillar portion RP via the lower end portion of the center pillar portion CP. This enables the body side panel BP to suppress deformation of the sill portion SL in case of the side collision. 
     In other words, in case where the body side panel BP is subjected to the side collision without the continuous ribs, in conjunction with the deformation of the sill portion SL to the inner side of the vehicle body, a front end side of the sill portion SL may be buckled to flip up as indicated by an arrow B in  FIG. 2 . As a countermeasure, in the body side panel BP, not only is the enhanced impact-absorbing function secured, but also rigidity of the sill portion SL is increased by continuously providing the sill upper-link rib  12 A and the sill lower-link rib  12 B all over the front-and-rear direction of the vehicle body. With this, the sill portion is prevented from being buckled. 
     In addition, the body side panel BP employs the lower intersection rib  14  and the upper intersection rib  15  including the at least one circular-arc intersection rib  14 A and the at least one circular-arc intersection rib  15 A each having the convex curved surface on the side where the center pillar portion CP is present, and the at least one straight intersection rib  14 B and the at least one straight intersection rib  15 B each arranged radially from the center of the convex curved surface. This enables the body side panel BP not only to secure the enhanced impact-absorbing function but also to bear load on the upper end portion and the lower end portion of the center pillar portion CP in a distributed manner with its entirety. In other words, the body side panel BP is capable of securing, with use of the requisite minimum number of the intersection ribs  14  and  15 , strength and rigidity that are necessary against impact energy that cannot be fully absorbed by the link ribs ( 11 A,  11 B,  12 A,  12 B,  13 A, and  13 B). 
     In the body side panel BP according to the present invention, the resin member R is not limited in particular as long as the resin member R is applicable to body side panels for automobiles. As examples of the resin member R, there may be mentioned fiber reinforced resins such as a carbon-fiber reinforced resin and a glass-fiber reinforced resin. As a preferred example of the carbon-fiber reinforced resin, from viewpoints of increasing the overall rigidity of the body side panel and of weight reduction of the same, there may be mentioned a carbon-fiber-reinforced thermoplastic resin (CFRTP). 
     As examples of carbon fiber contained in the carbon-fiber-reinforced thermoplastic resin, there may be mentioned a regular tow formed of filaments each including approximately 1,000 to 24,000 monofilaments, and a large tow formed of filaments each including 40,000 or more monofilaments. Alternatively, a recycled material or a non-woven fabric also may be used. 
     As examples of resins contained in the carbon-fiber-reinforced thermoplastic resin, there may be mentioned polyamide (PA6), polyamide 66 (PA66), polypropylene (PP), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), meta-xylene diamine 6 (MXD6), and polynonamethylene terephthalamide (PA9T). 
     The body side panel BP of the present invention is featured in that the thermoplastic resin containing the discontinuous carbon fiber as the reinforcing material is used as the resin member R. Thus, the resin member R can be easily integrated with the one metal panel P 1  by injection molding or resin-press molding. Further, the discontinuous fiber used in the resin member R of the body side panel BP is relatively long, and hence strength and rigidity can be further increased. Still further, the resin member R of the body side panel BP can be molded integrally with the one metal panel P 1  by injection molding or press-molding. Thus, a production cycle time is reduced, and a degree of freedom in designing the ribs is increased. 
       FIG. 5  to  FIG. 16  are explanatory views of body side panels according to a second embodiment to an eighth embodiment of the present invention.  FIG. 5 ,  FIG. 7 ,  FIG. 9 ,  FIG. 11 , and  FIG. 13  are each a cross-sectional view of the roof side portion and the center pillar portion, which is taken along the arrows A-A in  FIG. 2 .  FIG. 6 ,  FIG. 8 ,  FIG. 10 ,  FIG. 12 , and  FIG. 14  are each another cross-sectional view of the center pillar portion and the sill portion, which is taken along the arrows B-B in  FIG. 2 . Hereinbelow, in each of the embodiments, the same components as those in the first embodiment are denoted by the same reference symbols to omit redundant description. 
     Second Embodiment 
     In the structure of the body side panel BP, a main part of which is illustrated in  FIG. 5  and  FIG. 6 , as illustrated particularly in  FIG. 6 , the clearance W 1  between the one metal panel P 1  and the other metal panel P 2  in the sill portion SL (width of the space A) is larger than the clearance W 2  between the one metal panel P 1  and the other metal panel P 2  in the center pillar portion CP. 
     In addition, in the structure of the body side panel BP, with regard to the resin member R, the clearance from the distal end portion of each of the link ribs in the sill portion Sl to the other metal panel is larger than the clearance from the distal end portion of each of the link ribs in the center pillar portion to the other metal panel. 
     More specifically, as illustrated in  FIG. 6 , in the body side panel BP, the clearance S 1  (S 1   a ) from the distal end portion of each of the sill upper-link rib  12 A and the sill lower-link rib  12 B to the other metal panel P 2  is larger than the clearance S 1  (S 1   b ) from the distal end portion of the pillar rear-link rib  11 B to the other metal panel P 2 . In the illustrated example, the sill upper-link rib  12 A and the sill lower-link rib  12 B each have the protrusion dimension L 1  of protruding beyond the upper flange portion Po of the other metal panel P 2 . The pillar rear-link rib  11 B does not reach the upper flange portion Po of the other metal panel P 2 , and hence is shorter than the sill upper-link rib  12 A and the sill lower-link rib  12 B. 
     In case of side collision, in the body side panel BP configured in this way, impact is received by the sill portion S 1 , and its entirety is uniformly deformed. Energy of the impact is absorbed by the sill upper-link rib  12 A and the sill lower-link rib  12 B, and then the energy of the impact is absorbed by the pillar rear-link rib  11 B. In addition, the energy of the impact is absorbed by the lower intersection rib  14 . In such a way, the body side panel BP is not only capable of implementing the impact absorbing function as in the foregoing embodiment, but also is featured in being capable of suppressing local deformation of the sill portion SL by reliably receiving force of the impact with the sill portion SL. 
     Third Embodiment 
     In the structure of the body side panel BP, a main part of which is illustrated in  FIG. 7  and  FIG. 8 , one or more of the respective clearances from the distal end portions of the link ribs of the resin member R to the other metal panel P 1  is different from other ones of the respective clearances. One or more of respective thickness dimensions of these link ribs is different from other ones of the respective thickness dimensions. In addition, the thickness dimensions become larger as the clearances become smaller. 
     More specifically, as illustrated particularly in  FIG. 8 , in the body side panel BP of this embodiment, the sill upper-link rib  12 A has a width dimension T 1  that is larger than a width dimension T 2  of each of the other link ribs  11 B and  12 B. The clearance S 1  (S 1   a ) from the distal end portion of this sill upper-link rib  12 A to the other metal panel P 2  is smaller than the clearance S 1  (S 1   b ) from each of the other link ribs  11 B and  12 B. 
     In case of side collision, in the body side panel BP configured in this way, the sill upper-link rib  12 A with the largest width dimension T 1  strikes against the other metal panel P 2  first, and absorbs initial impact energy. In this way, the body side panel BP is not only capable of implementing the impact absorbing function as in the foregoing embodiments, but also is featured in being capable of receiving high force of the initial impact. Note that, although the sill upper-link rib  12 A has the large width dimension T 1  in the above-description of this embodiment, as a matter of course, another one of the link ribs may be selected and similarly configured. 
     Fourth Embodiment 
     In the structure of the body side panel BP, a main part of which is illustrated in  FIG. 9  and  FIG. 10 , the respective clearances S 1  from the distal end portions of the link ribs of the resin member R to the other metal panel P 2  are set equal to each other. 
     More specifically, in the body side panel BP of this embodiment, the respective clearances S 1  from the distal end portions of the roof upper-link rib  13 A, the roof lower-link rib  13 B, and the pillar front-link rib  11 A that are illustrated in  FIG. 9 , and from those of the pillar rear-link rib  11 B, the sill upper-link rib  12 A, and the sill lower-link rib  12 B that are illustrated in  FIG. 10  to the other metal panel P 2  are equal to each other. 
     In case of side collision, in the body side panel BP configured in this way, the roof upper-link rib  13 A, the roof lower-link rib  13 B, the pillar front-link rib  11 A, the pillar rear-link rib  11 B, the sill upper-link rib  12 A, and the sill lower-link rib  12 B bear initial impact simultaneously with each other in a distributed manner. Then, the upper intersection rib  15  and the lower intersection rib  14  absorb secondary impact. In this way, the body side panel BP is not only capable of implementing the impact absorbing function as in the foregoing embodiments, but also is featured in being capable of receiving the high force of the initial impact. 
     Fifth Embodiment 
     In the structure of the body side panel BP, a main part of which is illustrated in  FIG. 11  and  FIG. 12 , the thickness dimension T 1  of the sill lower-link rib  12 B of the resin member R is larger than the thickness dimension T 2  of each of the other link ribs. 
     In case of side collision, in the body side panel BP configured in this way, the sill lower-link rib  12 B mainly absorbs the initial impact, and then the upper intersection rib  15  and the lower intersection rib  14  absorb the secondary impact. In this way, the body side panel BP is not only capable of implementing the impact absorbing function as in the foregoing embodiments, but also is featured in being capable of more advantageously absorbing the high force of the initial impact. 
     Sixth Embodiment 
     In the structure of the body side panel BP, a main part of which is illustrated in  FIG. 13  and  FIG. 14 , the thickness dimension of each of the link ribs of the resin member R is larger than the thickness dimension of each of the intersection ribs. 
     More specifically, in the body side panel BP of this embodiment, the thickness dimension T 1  of each of the roof upper-link rib  13 A, the roof lower-link rib  13 B, and the pillar front-link rib  11 A that are illustrated in  FIG. 13 , and of each of the pillar rear-link rib  11 B, the sill upper-link rib  12 A, and the sill lower-link rib  12 B that are illustrated in  FIG. 14  is larger than the thickness dimension T 2  of each of the upper intersection rib  15  and the lower intersection rib  14 . 
     In case of side collision, in the body side panel BP configured in this way, the thickness dimension T 1  of each of the roof upper-link rib  13 A, the roof lower-link rib  13 B, the pillar front-link rib  11 A, the pillar rear-link rib  11 B, the sill upper-link rib  12 A, and the sill lower-link rib  12 B that strike against the other metal panel P 2  first is large, and hence these link ribs reliably absorb the initial heavy impact. Then, the upper intersection rib  15  and the lower intersection rib  14  absorb the secondary impact. In this way, the body side panel BP is not only capable of implementing the impact absorbing function as in the foregoing embodiments, but also is featured in being capable of more advantageously absorbing the high force of the initial impact. 
     Seventh Embodiment 
     The structure of the body side panel BP, a main part of which is illustrated in  FIG. 15 , is featured in that, of thickness dimensions of the circular-arc intersection ribs  14 A and  15 A and the straight intersection ribs  14 B and  15 B of the intersection ribs  14  and  15  of the resin member R, the thickness dimension of each of the straight ribs  14 A and  15 A is gradually reduced from the center of the convex curved surface toward a distal end portion of each of the straight ribs  14 A and  15 A. 
     In case of side collision, in the body side panel BP configured in this way, the thickness dimension of each of the straight ribs  14 A and  15 A is gradually reduced from the center of the convex curved surface toward the distal end portion, that is, from an outermost portion of the panel to the inner inside. This is because load to be applied from the outside is maximum at the outermost portion of the panel, and is distributed toward an inside of the panel. In this way, the body side panel BP is not only capable of implementing the impact absorbing function as in the foregoing embodiments, but also is featured in being capable of reducing volume of all the ribs to a requisite minimum while maintaining strength that is necessary for the intersection ribs  14  and  15 . As a result, contribution to further weight reduction can be made. 
     Eighth Embodiment 
     In the structure of the body side panel BP, a main part of which is illustrated in  FIG. 16 , the link ribs  11 A,  11 B,  12 A,  12 B,  13 A, and  13 B of the resin member R each include thick corner portions  16  that increase thickness dimensions at each intersection part where the link rib  11 A,  11 B,  12 A,  12 B,  13 A, or  13 B intersects with the intersection rib  14  or  15 . In this embodiment, the thick corner portions  16  are provided at four positions at each of the intersection parts. 
     The body side panel BP configured in this way is not only capable of implementing the impact absorbing function as in the foregoing embodiments, but also is featured in that the overall rigidity is increased by rigidly joining the ribs to each other with the thick corner portions  16  provided at each of the intersection parts where the link ribs and the intersection ribs intersect with each other. In other words, in the body side panel BP, force of coupling the ribs to each other is further increased, and hence desired strength can be maintained even when the thickness dimensions of the ribs are reduced. Thus, the contribution to further weight reduction can be made. 
     Configurations of the body side panel according to the present invention are not limited to those of the foregoing embodiments, and may be modified as appropriate within the gist of the present invention. In addition, the structures described in the embodiments may be selectively combined with each other. In the configurations exemplified in the foregoing embodiments, impact is absorbed in two steps by the link ribs and the intersection ribs. However, it is theoretically possible to implement the impact absorbing function in more than two steps by adjusting the lengths and the width dimensions of the ribs. Note that, even with the configurations of the foregoing embodiments, the body side panel according to the present invention is capable of sufficiently absorb the impact in case of side collision in the two steps. 
     In addition, if the body side panel according to the present invention is applied to a type that front and rear doors are arranged as illustrated in  FIG. 2 , the link ribs may be provided along the front pillar portion and the rear pillar portion, and the intersection ribs may be provided in intersection regions where these link ribs and the sill portion SL or the roof side portion intersect with each other. The body side panel according to the present invention is applicable also to a type that a single door is arranged on one side. 
     REFERENCE SIGNS LIST 
     
         
         A Space 
         BP Body side panel 
         FP Front pillar portion 
         P 1  One metal panel 
         P 2  Another metal panel 
         R Resin member 
         RP Rear pillar portion 
         RS Roof side portion 
         SP Center pillar portion 
         SL Sill portion 
           11 A Pillar front-link rib 
           11 B Pillar rear-link rib 
           12 A Sill upper-link rib 
           12 B Sill lower-link rib 
           13 A Roof upper-link rib 
           13 B Roof lower-link rib 
           14  Lower intersection rib 
           14 A Circular-arc intersection rib 
           14 B Straight intersection rib 
           15  Upper intersection rib 
           15 A Circular-arc intersection rib 
           15 B Straight intersection rib 
           16  Thick corner portion