JP6110834B2 - Body side structure - Google Patents

Description

  The present invention relates to a vehicle body side structure.

  In general, a plurality of roof arch members (roof rails) that extend in the vehicle width direction on the lower surface of the roof panel and hold the roof panel, and both ends of the roof arch member are coupled above the vehicle body side portion. A roof side rail extending in the vehicle body longitudinal direction (hereinafter referred to as “front-rear direction”), and a pillar having an upper end joined to the roof side rail and extending downward (see, for example, Patent Document 1). ).

In the vehicle body superstructure described in Patent Document 1, the side rail outer and the side rail inner are vertically cut in the vehicle width direction on the roof side rail extending in the front-rear direction from both ends of the roof arch member. It joins in the shape of a tube so that a closed section may be formed in plan view. A side rail inner, a center pillar inner, and a gusset are provided as side inner members on the vehicle interior side (hereinafter referred to as “vehicle interior”) of the side rail outer where the roof side rail and the pillar are joined. It has been. A side rail inner consists of one member extended in the front-back direction. The center pillar inner is divided into a pillar inner body provided on the inner side of the side rail outer and a pillar upper.
The gusset connects the upper end portion of the pillar upper and the end portion of the roof arch member.

  At the junction between the roof side rail and the pillar, the pillar upper is extended in the front-rear direction from the intersection with the center pillar to a position near the upper center of the door opening, and has a rectangular uniform plate thickness that is long in the front-rear direction. Made of rolled steel plate. The pillar upper is installed so as to overlap the upper end portion of the pillar inner body and the side rail inner, and the front end portion and the rear end portion located at the front-rear direction side from the intersection with the center pillar are extended in the front-rear direction. It is joined to the inside of the side rail inner car.

JP 2009-298335 A

However, in the vehicle body side part structure described in Patent Document 1, the front end portion and the rear end portion of the pillar upper are extended to a position in the front-rear direction side from the intersection with the center pillar, and are joined to the side rail inner. Therefore, at the time of a collision, the structure is such that the collision load tends to concentrate on the joint portion (divided portion) between the pillar upper and the side rail inner.
For this reason, the vehicle body side structure of Patent Document 1 has a structure in which it is difficult to disperse the collision load in the longitudinal direction of the roof side rail at the time of a collision, so load transmission efficiency is poor, and the rigidity and strength of the vehicle body are low. There was a risk of lowering.

  Accordingly, the present invention has been invented to solve the above-described problems, and an object thereof is to provide a vehicle body side structure that further improves the rigidity and strength of a roof side rail.

As means for solving the above-mentioned problems, a vehicle body side structure according to the present invention is a vehicle body side structure having a roof side rail provided above a vehicle body side, and the roof side rail includes front and rear A front rail inner that extends in the direction, a rear rail inner that is joined to the rear end of the front rail inner and extends rearward, and a first joint that joins the front rail inner and the rear rail inner; And a center pillar inner that is joined to one of the vehicle inner side surfaces of the front rail inner and the rear rail inner at a position offset in the front-rear direction with respect to the first joint, and extends downward. The other of the front rail inner and the rear rail inner is provided in the front-rear position until it overlaps the center pillar inner in the vehicle width direction. The extension part is provided with a second joint in which the extension part, one of the front rail inner and the rear rail inner, and the center pillar inner are joined. And one of the front rail inner and the rear rail inner is formed of a material having a higher plate thickness or strength than the other .

According to such a configuration, in the vehicle body side structure, the side rail inner of the roof side rail is formed by joining the first joint of the members divided in the front-rear direction to the front rail inner and the rear rail inner. Yes. For this reason, since the side rail inner has a dividing line which divides into the front side rail inner and the rear side rail inner, it is possible to change each board thickness and material suitably. As a result, the side rail inner can be made to have high strength and high rigidity by forming the front rail inner with a thick plate, for example, as a countermeasure against a frontal collision (hereinafter referred to as “front collision”). Further, the side rail inner can be set at an appropriate position by forming the rear rail inner with a thin plate for weight reduction.
Further, the center pillar inner is joined to one of the vehicle inner side surfaces of the front rail inner and the rear rail inner at a position offset in the front-rear direction with respect to the first joint. For this reason, for example, when another body part (roof arch member, gusset, etc.) is joined to the center pillar inner, the front rail inner, the rear rail inner, the center pillar inner, and the other body parts are In addition, it is possible to eliminate the joining of four sheets and to weld the joining members in a state of three sheets. As a result, it is possible to stabilize the joint strength of the center pillar inner and improve the strength.
The other of the front rail inner and the rear rail inner has an extending portion extending in the front-rear direction to a position where the center pillar inner and the vehicle width direction overlap. The extension part has a three-layered second joint part in which the extension part, one of the front rail inner and the rear rail inner, and the center pillar inner are joined. The second joint portion is joined in a three-ply manner, and further, it is avoided that another vehicle body part is joined in a four-ply portion that overlaps in the vehicle width direction, so that the front rail inner and the rear rail inner Either can be joined to the center pillar inner. For this reason, the rigidity and intensity | strength of a roof side rail, a center pillar, and a cross | intersection part can be improved.
Further, according to such a configuration, the front rail inner is formed of a material having a higher plate thickness or strength than the rear rail inner, so that the front rail inner can be used as a countermeasure against a collision. The strength can be increased, and the rear rail inner can be made thinner to reduce the weight.
In addition, the front rail inner formed of the plate thickness or the material having high strength can transmit a load between the center pillar and the front rail inner by joining the center pillar inner, The rigidity and strength of the vehicle body can be improved.

Further , the vehicle body side structure according to the present invention is a vehicle body side structure having a roof side rail provided above the vehicle body side portion, and the roof side rail includes a front rail inner extending in the front-rear direction, A side rail inner having a rear rail inner joined to a rear end of the front rail inner and extending rearward, and a first joint portion where the front rail inner and the rear rail inner are joined; A center pillar inner that is joined to one of the vehicle inner side surfaces of the front rail inner and the rear rail inner at a position that is offset in the front-rear direction with respect to the first joint, and extends downward; The other of the inner and the rear rail inner is provided with an extending portion extending in the front-rear direction to a position overlapping with the center pillar inner in the vehicle width direction, Kinobede portion includes a the extending portion, one of said front rail inner and the rear side rail inner, said center pillar inner, has a second joint portion which is joined, the front rail inner, the The rear rail inner is formed of a material having a higher plate thickness or strength, the center pillar inner is joined to the front rail inner, and the first joint is formed from the center. The rear rail inner is provided at a position offset backward with respect to the pillar inner, and the second rail inner includes the extension portion extending forward to a position overlapping with the center pillar inner in the vehicle width direction. the junction to said extending portion of said rear rail inner, and the front rail inner, and the center pillar inner, characterized in that is bonded.

According to such a configuration , the first joint portion is provided at a position offset rearward from the intersection with the center pillar inner, so that the center pillar inner does not overlap the roof side rail, and the front rail inner and the rear rail Two rail inners can be stacked and joined.
Further, the second joint that extends the extending portion of the rear rail inner to the position where it overlaps the center pillar inner in the vehicle width direction includes the extending portion of the rear rail inner and the front rail inner. Then, the center pillar inner can be spot-welded in a three-layered state. As a result, the roof side rail prevents the front rail inner, the rear rail inner, the center pillar inner, and the roof arch member from being combined in a four-layered manner, thereby ensuring the rigidity and strength of the vehicle body. be able to. As a result, the roof side rail can suppress a decrease in rigidity and strength at the intersection with the center pillar, and can improve side collision (hereinafter referred to as “side collision”) performance and rollover performance.

  A vehicle body part that is joined to the inside of the center pillar inner in the vehicle width direction; and a third joint part that joins the front rail inner, the center pillar inner, and the body part. It is preferable that the portion extends to a position offset in the vertical direction or the front-rear direction with respect to the third joint portion.

  According to such a configuration, when a vehicle body part (for example, a roof arch member, a gusset, etc.) is joined to the center pillar inner, the third joint part to join the vehicle body part, the front rail inner, and the center pillar inner is provided. The extension part extended from the back side rail inner, the 2nd junction part which joined the front side rail inner, and the center pillar inner can be provided in the position to offset. Therefore, the roof side rail avoids the joining of the joining members in a four-ply state, and either the front rail inner or the rear rail inner is joined to the center pillar inner to The rigidity and strength of can be improved.

  The vehicle body part is a center roof rail extending in the vehicle width direction between the center pillar inners provided on both sides in the vehicle width direction, and the front rail inner and the center pillar inner are formed in the third joint portion. And the center roof rail are preferably joined together.

  According to such a configuration, the third joint portion is formed by joining the center roof rail, the front rail inner, and the center pillar inner so that the front rail inner, the center pillar inner, the center roof rail, It is possible to efficiently disperse and transmit the collision load in the front / rear / left / right / up / down direction. For this reason, the rigidity and strength above the vehicle body side portion can be further improved.

  Further, the outer rail joined to the vehicle rail outer side surface of the side rail inner and the center pillar inner, and the rear rail inner, the center pillar inner, and the outer panel are joined below the second joint. It is preferable that the rear end portion of the front rail inner is formed with a notch formed by inclining forward as it goes downward.

  According to this configuration, the roof side rail has the cutout portion formed at the rear end portion of the front rail inner, so that the front rail inner is joined while avoiding the fourth joint portion. Can be prevented from being welded in a four-ply state, and the welding strength can be stabilized.

  The vehicle body side part structure according to the present invention can further improve the rigidity and strength of the roof side rail.

It is a principal part schematic perspective view of the vehicle body which shows an example of the vehicle body side part structure which concerns on embodiment of this invention. It is the principal part expansion perspective view of the side rail inner which looked at the II section of FIG. 1 from the vehicle inner side. It is II sectional drawing of FIG. It is a principal part expansion perspective view which shows the junction part of the side rail inner seen from the vehicle inside. It is a principal part expansion perspective view which shows the upper part of the center pillar inner joined to the side rail inner. It is a principal part expansion perspective view which shows the junction part of the side rail inner seen from the vehicle outer side. It is a principal part expansion perspective view which shows a state when a center pillar stiffener is installed in the junction part of the side rail inner seen from the vehicle outer side.

With reference to FIGS. 1-7, an example of the vehicle body side part structure which concerns on embodiment of this invention is demonstrated.
In the embodiment of the present invention, “front” is the forward side of the vehicle C, “rear” is the backward side of the vehicle C, “upper” is the upper vertical side, and “lower” is the lower vertical side.

≪Vehicle≫
First, before describing the vehicle body side part structure according to the embodiment of the present invention, a vehicle C in which the vehicle body side part structure according to the present invention is employed will be described.
As shown in FIG. 1, a vehicle C includes, for example, a roof side rail 2 installed at left and right ends of a roof arch member 4 that extends in the vehicle width direction, and a downward direction from the roof side rail 2. And a pillar 5 that extends. The type and shape of the vehicle C are not particularly limited. The vehicle C may be a passenger car, a bus, a truck, a work vehicle, or the like as long as the vehicle body 1 includes the roof side rail 2 and the pillar 5. Hereinafter, a four-door passenger car will be described as an example.

≪Body≫
The vehicle body 1 is a skeleton member for forming the entire vehicle C. For example, various metal vehicle body frames such as a roof side rail 2 described later, and metal vehicle body panels such as a roof panel 11 (see FIG. 2). And is configured. The vehicle body side portions 1a on both sides of the vehicle body 1 are formed with a door opening 1b for the front seat and a door opening 1c for the rear seat, and a roof side rail 2 is provided above the door openings 1b and 1c. It has been.
Since the vehicle body 1 is formed so that the vehicle body side portion 1a is substantially bilaterally symmetric, the passenger seat side (left side) will be mainly described, and the description of the driver seat side (right side) will be omitted.

  The upper part 1d of the vehicle body is an upper part of the vehicle body 1 and includes a roof panel 11 (see FIG. 2) that constitutes a plate part of the roof, and a roof arch member that is installed below the roof panel 11 and constitutes the skeleton of the roof part. 4 and a pillar 5 extending downward from the roof arch member 4 are provided.

≪Roof panel≫
The roof panel 11 shown in FIG. 2 is a plate member that forms the roof of the vehicle body 1 and is made of a metal plate such as a rolled steel plate formed in a substantially rectangular shape in plan view. The left and right ends of the roof panel 11 form a half of a groove 1e (see FIG. 3) that is bent into a concave groove when viewed from the front. The roof panel 11 is connected and fixed by spot welding with the rail outer 23 of the roof side rail 2, the roof arch member 4, and the side rail inner 20 of the roof side rail 2 overlapped at the bottom portion of the groove 1e.

<Roof arch member>
As shown in FIG. 1, the roof arch member 4 is a member that supports the roof panel 11 (see FIG. 2) from below, and is laid between the left and right roof side rails 2. The roof arch member 4 includes a front roof rail 42 having a windshield rail 46, a front roof arch 44, a center roof rail 41, a rear roof arch 45, a rear, and the like through an appropriate interval from the front end to the rear end of the upper body 1d. The roof rails 43 are arranged in this order. The left and right end portions of the roof arch member 4 are installed on the roof side rail 2.

The center roof rail 41 is a roof rail installed between the left and right center pillars 5B, and includes a roof rail portion 41A and a pillar upper extension portion 41B. The roof rail portion 41A is disposed in the vehicle width direction at the center of the vehicle body upper portion 1d. One end of the pillar upper extension portion 41B is joined to both ends of the roof rail portion 41A, and the other end is disposed and joined inside a front rail inner 21 and a center pillar inner 51 which will be described later (see FIG. 3). .
The center roof rail 41 may be formed by integrally forming a roof rail portion 41A and a pillar upper extension portion 41B.

≪Roof side rail≫
As shown in FIG. 1, the roof side rail 2 is a pair of left and right cylindrical frame members arranged in the front-rear direction above the vehicle body side portion 1 a. At the front end, the center portion, and the rear end of the roof side rail 2, pillars 5 that are joined at the upper end portion and hang downward are provided. The roof side rail 2 is installed from the left and right front ends to the rear end of the vehicle body upper portion 1d, and forms upper edges of the door openings 1b and 1c.
Hereinafter, as an example of the present invention, a roof side rail 2 at a portion where a center pillar 5B (also referred to as a “B pillar”) disposed on an upper vehicle body side portion 1a near the rear of the central portion on the left side of the vehicle C is installed. An example will be described.

As shown in FIG. 3, the roof side rail 2 has a longitudinal section in which a side rail inner 20 disposed on the vehicle inner side and a rail outer 23 (outer panel) disposed on the vehicle outer side of the side rail inner 20 are joined. The closed section 2a is formed as viewed.
As shown in FIGS. 2 and 3, the roof side rail 2 is provided with a pillar upper extension portion 41 </ b> B and a roof panel 11 at the vehicle interior upper portion at the center portion in the front-rear direction. A center pillar inner 51, a center pillar stiffener 52 disposed outside the center pillar inner 51, and a center pillar stiffener 52 are disposed at the vehicle interior lower portion at the center in the front-rear direction of the roof side rail 2. A center pillar outer 53 is provided.

<Side rail inner>
The side rail inner 20 is a member that is provided orthogonal to the upper end portion 51 a of the center pillar inner 51 and holds the roof panel 11 and the roof arch member 4 (vehicle body part). The side rail inner 20 is a half body that forms a vehicle inner side portion of the roof side rail 2 formed in a cylindrical shape with the rail outer 23. As shown in FIG. 6, the side rail inner 20 includes a front rail inner 21 disposed from the rear upper end of the center pillar 5B toward the front side, and a rear side disposed from the rear upper end of the center pillar 5B toward the rear side. The rail inner 22 is connected in a straight line in the front-rear direction.

  As shown in FIGS. 2 and 3, the side rail inner 20 has inner upper flap portions 21c and 22c that are bent substantially horizontally with the upper edge portion directed toward the inner side of the vehicle body, and the lower end portion directed obliquely downward on the inner side of the vehicle body. And inner lower flap portions 21d and 22d bent.

<Front rail inner>
As shown in FIG. 2, the front rail inner 21 is constructed so as to extend in the front-rear direction from the upper rear end of the front pillar 5A (see FIG. 1) to the upper rear end of the center pillar 5B. The upper half portion of the rear end portion 21a of the front rail inner 21 extends to the rear side of the center pillar inner 51 and the pillar upper extension portion 41B.
The front rail inner 21 is provided with a notch portion 21b formed on the lower side of the rear end portion 21a, an inner upper flap portion 21c extending in the front-rear direction on the upper edge portion, and a front-rear direction extending on the lower edge portion. The inner lower flap portion 21d and the overlap portion 21e formed at the rear edge are provided.

As shown in FIG. 3, the front rail inner 21 is made of a thick material (for example, a rolled steel plate) with respect to the rear rail inner 22.
The front rail inner 21 may be formed of a material thicker than the rear rail inner 22 or a material having high strength (for example, a high-tensile steel plate (high-tensile material)).

The notch 21b is formed so as to incline forward from the center of the rear end 21a of the front rail inner 21 toward the lower side.
The inner upper flap portion 21 c and the inner lower flap portion 21 d are formed by bending the upper and lower edge portions of the front rail inner 21.
The overlap portion 21 e is a portion where the rear end portion 21 a of the front rail inner 21 overlaps the front end portion 22 a of the rear rail inner 22.

<Rear rail inner>
As shown in FIG. 1, the rear rail inner 22 is constructed so as to extend in the front-rear direction from the upper rear end portion of the center pillar 5B to the upper front end portion of the rear pillar 5C. As shown in FIG. 2, the rear rail inner 22 includes an extended portion 22b formed on the lower side of the front end portion 22a, an inner upper flap portion 22c extending in the front-rear direction on the upper edge portion, and a lower edge. It has an inner lower flap portion 22d extending in the front-rear direction and an overlap portion 22e formed on the rear edge.

<Extension part>
The extending portion 22b is provided at a position below the front end portion of the rear rail inner 22 and extends in the front direction (front-rear direction) to a position overlapping the center pillar inner 51 in the vehicle width direction. The extended portion 22b is provided with a second joint portion 32 which will be described later. The extending part 22 b extends to a position offset downward with respect to the third joint part 33.
In addition, you may provide the extended part 22b in the state extended to the position offset in the front-back direction with respect to the 3rd junction part 33. FIG.

The inner upper flap portion 22c and the inner lower flap portion 22d are formed by bending the upper and lower edges of the rear rail inner 22.
The overlap portion 22 e is a portion where the rear end portion 21 a of the front rail inner 21 is overlapped with the front end portion 22 a of the rear rail inner 22.

<Joint part>
As shown in FIG. 2, the joint portion 3 is a portion where a member to be joined is joined by spot welding or the like in the vicinity of the center pillar connecting portion 2 b where the roof side rail 2 and the center pillar 5 </ b> B are connected. The joint part 3 mainly includes a first joint part 31 to an eighth joint part 38.
2, 4, and 5, the X mark indicates the welded portion of the joint 3 that is welded and connected in a two-ply manner, and the circle X is the joint 3 that is welded and connected in a three-ply manner. The welding location of is shown.

  As shown in FIGS. 2 and 4, the first joint portion 31 is a portion where the upper half of the rear end portion 21 a of the front rail inner 21 and the upper half of the front end portion 22 a of the rear rail inner 22 are joined. It is. The first joint portion 31 is spot-welded at four locations from the center of the overlap portions 21e and 22e where the front rail inner 21 and the rear rail inner 22 are overlapped to the inner upper flap portions 21c and 22c. Yes. The first joint portion 31 is provided at a position offset rearward with respect to the center pillar inner 51, and is located at a portion protruding rearward from the center pillar 5B.

As shown in FIGS. 2 and 5, the second joint portion 32 includes a lower half of the rear end portion 21 a of the front rail inner 21, a front end portion 22 a of the rear rail inner 22, and an upper end portion of the center pillar inner 51. 51a is a part joined. As for the 2nd junction part 32, the overlap part 21e of the front rail inner 21, the overlap part 22e of the rear rail inner 22, and the rear side of the upper end part 51a of the center pillar inner 51 are arrange | positioned by 3 sheets. The two parts are joined by spot welding.
In addition, the 2nd junction part 32 should just join the extension part 22b, one of the front rail inner 21 and the rear rail inner 22, and the center pillar inner 51, and the front rail inner 21 and the rear side Either of the rail inner 22 and the rail inner 22 may be joined.

  As shown in FIG. 2, the third joint portion 33 includes a rear end portion 21a of the front rail inner 21, an upper end portion 51a of the center pillar inner 51, and a pillar upper extension portion 41B of the roof arch member 4 (vehicle body part). The left end 41Ba is a part to be joined. The third joint portion 33 includes a vertical center portion near the rear end portion 21a of the front rail inner 21, an upper end portion 51a of the center pillar inner 51, a left end portion 41Ba of the pillar upper extension portion 41B (vehicle body part), Are joined by spot welding at three locations in the front-rear direction of the portion arranged in three layers.

  The fourth joint 34 is a portion where the front end 22a of the rear rail inner 22, the upper end 51a of the center pillar inner 51, and the rail outer 23 (outer panel) are joined below the second joint 32. is there. As for the 4th junction part 34, the lower end of front end part 22a of rear rail inner 22, the rear end part of upper end part 51a of center pillar inner 51, and the lower end part of rail outer 23 (outer panel) are arranged in three sheets. One part of the formed part is joined by spot welding. The front rail inner 21 is formed so that a notch 21b is formed in the vicinity where the fourth joint 34 is disposed so as not to overlap the fourth joint 34.

  As shown in FIG. 2, the fifth joint portion 35 is formed by joining the inner lower flap portion 21 d of the front rail inner 21, the projecting portion 51 c of the center pillar inner 51, and the rail outer 23 (see FIG. 3). It is a part to be done.

The sixth joint portion 36 is a portion where the front rail inner 21 and the front side of the upper end portion 51a of the center pillar inner 51 are joined in a two-ply manner.
The seventh joint portion 37 is a portion where the inner upper flap portion 21c of the front rail inner 21 and the pillar upper extension portion 41B are joined in a two-ply manner.
The eighth joint portion 38 is a portion where the front and rear edge portions of the center pillar inner 51, the reinforcing pillar stiffener (not shown), and the rail outer 23 (see FIG. 3) are joined in a three-layered manner.

<Rail Outer>
As shown in FIG. 3, the rail outer 23 is a half that forms a vehicle outer side portion of the roof side rail 2. The rail outer 23 is disposed to face the side rail inner 20 via the closed section 2a and extends in the front-rear direction. The rail outer 23 is joined to the roof panel 11 and the inner upper flap portions 21c and 22c of the side rail inner 20 with the outer upper flap portion 23a formed at the upper end disposed in the groove portion 1e. Moreover, the outer lower flap part 23b formed in the lower end of the rail outer 23 is connected to the inner lower flap parts 21d and 22d (see FIG. 2) of the side rail inner 20.

  The outer upper flap portion 23a is spot-welded in the groove portion 1e with the roof panel 11 and the inner upper flap portion 21c being overlapped. The outer lower flap portion (not shown) is spot welded to the inner lower flap portion 21 d and the upper end portion 51 a of the center pillar inner 51.

<Car body parts>
The vehicle body part described in the claims is a part joined to the inner side in the vehicle width direction of the center pillar inner 51 shown in FIG. 1, for example, a pillar upper extension part 41B. The upper end portion 51a of the center pillar inner 51 (see FIG. 3) is joined to the vehicle outer side of the lower end portion (end portion in the vehicle width direction) of the pillar upper extension portion 41B.
The vehicle body part may be the center roof rail 41 in which the roof rail portion 41A and the pillar upper extension portion 41B are integrated. In other words, the vehicle body part may be the roof arch member 4 extending in the vehicle width direction between the center pillar inners 51 provided on both sides in the vehicle width direction. Hereinafter, the case where the center roof rail 41 is joined by connecting the roof rail portion 41A and the pillar upper extension portion 41B will be described as an example.

≪Pillar≫
As shown in FIG. 1, the pillar 5 includes, for example, a front pillar 5A, a center pillar 5B, and a rear pillar 5C.
The front pillars 5A are columns provided on the left and right sides of the windshield (not shown), and are disposed obliquely from the front end of the connected roof side rail 2 toward the front lower side.

  The center pillar 5B is a column (intermediate pillar) extending downward from the center pillar connecting portion 2b between the door opening 1b and the door opening 1c. The center pillar 5B shown in FIG. 3 includes a center pillar inner 51, a center pillar stiffener 52 disposed outside the center pillar inner 51 (not shown in FIG. 3), and a center provided on the vehicle exterior side of the center pillar stiffener 52. A pillar outer 53.

  As shown in FIG. 2, the center pillar inner 51 joins the second joint 32, the third joint 33, the fifth joint 35, and the sixth joint 36 to the front rail inner 21, 21 is fixed to the rear end 21a. Further, the center pillar inner 51 is fixed to the front end 22 a of the rear rail inner 22 by joining the second joint portion 32 and the fourth joint portion 34 to the rear rail inner 22. The center pillar inner 51 is joined to the vehicle inner side surfaces of the front rail inner 21 and the rear rail inner 22 at a position offset forward with respect to the first joint portion 31 and extends downward.

  As shown in FIG. 7, the upper end portion of the center pillar stiffener 52 is disposed and joined so as to overlap the center pillar connecting portion 2b of the roof side rail 2, and the inner upper flap portion 21c and the pillar upper extension portion 41B. The flap portion 52a is extended to be joined.

  As shown in FIG. 3, the center pillar outer 53 is a member that forms the outside of a tubular center pillar 5B that is a part of the vehicle body side portion 1a, and is formed by, for example, pressing a rolled steel plate or the like. . The center pillar outer 53 and the rail outer 23 form an integrally formed outer panel. The center pillar outer 53 extends downward from the center pillar connecting portion 2b of the roof side rail 2, and is disposed so as to face the center pillar inner 51 and is joined to each other by spot welding (eighth joint 38). It is integrated.

  As shown in FIG. 1, the rear pillar 5C is a column provided on the rear side of the door opening 1c. The rear pillar 5 </ b> C is joined to the rear end of the roof side rail 2 and extends downward from the rear end portion of the roof side rail 2.

≪Operation of vehicle body side structure≫
Next, the operation of the vehicle body side part structure according to the embodiment of the present invention will be described along the assembling procedure with reference to the drawings.

First, as shown in FIG. 4, the rear end portion 21a of the front rail inner 21 is overlapped with the overlap portions 21e and 22e of the front end portion 22a of the rear rail inner 22, and the first joint portion 31 is joined by spot welding. Thus, the side rail inner 20 is formed.
As described above, the side rail inner 20 is joined to the one divided into the front rail inner 21 and the rear rail inner 22 to form one member, so that the thickness and material of each are appropriately changed. Is possible.

Next, as shown in FIG. 5, the center pillar inner portion 51 is overlapped on the center pillar connecting portion 2 b of the side rail inner 20, and the second joint portion 32 and the sixth joint portion 36 are joined by spot welding. A center pillar inner 51 is attached to the rail inner 20.
In this case, the center pillar inner 51 is joined to the front rail inner 21 and the rear rail inner 22 at a position offset in the forward direction with respect to the first joint portion 51 of the overlap portions 21e and 22e. The second joint portion 32 includes the cutout portion 21b of the front rail inner 21 and the extended portion 22b of the rear rail inner 22 so that the front rail inner 21, the rear rail inner 22, the center pillar inner 51, Are joined in a three-ply manner, so that the joining strength of the center pillar inner 51 can be improved as compared with the case of joining in a four-ply manner.
In addition, since the front rail inner 21 and the center pillar inner 51 are joined in two layers, the sixth joint 36 has a strong joint strength and can be firmly joined.

  Next, as illustrated in FIG. 2, the left end portion 41 </ b> Ba of the pillar upper extension portion 41 </ b> B to which the roof rail portion 41 </ b> A is joined is overlapped with the center pillar connecting portion 2 b of the side rail inner 20, and the third joint portion 33 and the seventh joint portion 33. The joint portion 37 is joined by spot welding. Thereby, the center roof rail 41 is attached to the side rail inner 20 in the state shown in FIG.

  In this case, as shown in FIG. 2, the third joint portion 33 includes the front rail inner 21, the upper end portion 51a of the center pillar inner 51, the left end portion 41Ba of the pillar upper extension portion 41B (roof arch member 4), Is bonded in three layers, so that the bonding strength can be improved as compared with the case of bonding in four layers. In addition, since the inner upper flap portion 21c of the front rail inner 21 and the pillar upper extension portion 41B are joined in a stacked manner in the seventh joint portion 37, similarly, the joint strength is strong and can be firmly joined. it can.

As shown in FIG. 6, the side rail inner 20 includes overlap portions 21e and 22e on the rear side of the center pillar connecting portion 2b to which the front rail inner 21, the center pillar 5B, and the pillar upper extension portion 41B are joined. The front rail inner 21 and the rear rail inner 22 are connected. Therefore, when the vehicle C collides forward and a collision load is applied to the front rail inner 21, the collision load is caused by the center pillar connecting portion 2 b, the center pillar inner 51, the center roof rail 41, and the rear rail inner 22. To be distributed.
Accordingly, it is possible to reduce the collision load applied to the rear rail inner 22 disposed behind the center pillar connecting portion 2b.

  As a result, as shown in FIG. 3, the rear rail inner 22 can be formed by a member having a thinner plate thickness or a member having a lower strength than the front rail inner 21. For this reason, the side rail inner 20 can form the rear rail inner 22 with a member having a thinner plate thickness than the front rail inner 21, so that weight reduction and cost reduction can be achieved by reducing the plate thickness. Can do.

  Moreover, the side rail inner 20 can form the front side rail inner 21 with a high tensile steel plate (high-tensile material), and can form the rear side rail inner 22 with a rolled steel plate etc. whose intensity | strength is weaker than a high strength steel plate. For this reason, the cost reduction of material cost can be aimed at by the part which formed the back side rail inner 22 with the rolled steel plate.

  Next, as shown in FIG. 7, the center pillar stiffener 52 and the rail outer 23 (center pillar outer 53) are overlapped on the center pillar connecting portion 2b of the side rail inner 20, and the flap portion 52a is connected to the inner upper flap portion 21c and The fourth joint 34, the fifth joint 35, and the eighth joint 38 shown in FIG. 2 are joined by spot welding so as to overlap the pillar upper extension part 41B.

  In this case, as shown in FIG. 2, the fourth joint portion 34 is formed with a notch portion 21 b at the rear end portion of the front rail inner 21, thereby avoiding the front rail inner 21 and the rear rail inner 22. Since the center pillar inner 51 and the rail outer 23 (see FIG. 3) are joined in a three-layered manner, the joining strength can be improved as compared with the case of joining in a four-layered manner.

  Moreover, since the front rail inner 21, the center pillar inner 51, and the rail outer 23 (see FIG. 3) are joined in a three-layer manner, the fifth joint 35 can be firmly joined to each other in the same manner. . Further, since the center pillar inner 51, the reinforcing pillar stiffener (not shown), and the rail outer 23 (see FIG. 3) are joined in a three-layered manner, the eighth joint 38 is also firmly attached to each other. Can be joined.

  As shown in FIG. 2, the side rail inner 20 is arranged such that other members to be joined such as the inner upper flap portions 21 c and 22 c and the inner lower flap portions 21 d and 22 d are overlapped by three or two overlapped members. Spot welding, so it is not joined in four layers. For this reason, the side rail inner 20 is firmly and firmly joined at all joint portions, and is connected to the center pillar 5B and the center roof rail 41 shown in FIG. 1 and FIG. Can be further enhanced.

  As shown in FIG. 3, the roof side rail 2 formed in this way is deformed even when a collision load is applied, because the side rail inner 20 and the rail outer 23 form a closed section 2 a. The rigidity and strength can be improved.

[Modification]
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. The present invention extends to these modifications and changes. Of course.

In the above-described embodiment, the pillar upper extension portion 41B (center roof rail 41) is described as an example of the vehicle body part to be joined to the inside of the center pillar inner 51 in the vehicle width direction, but the center roof rail 41 and the center pillar inner 51 are described. A reinforcing gusset or a roof arch may be provided.
In the case of a gusset, the center roof rail 41 may be a single body part integrated with the gusset, or may be a separate body. Further, the center roof rail 41 may be one that is connected to the center pillar 5B via gussets at the left and right ends of the center roof rail 41.

  Moreover, the extension part 22b provided in the front end part 22a of the rear rail inner 22 may be provided in the rear end part 21a of the front rail inner 21 when the first joint part 31 is arranged on the front side of the center pillar 5B. . In this case, the front rail inner 21 and the rear rail inner 22 are formed in the forward direction up to a position overlapping the center pillar inner 51 in the vehicle width direction, and the second joint portion 32 and the overlap portions 21e and 22e are also formed. It is formed at a position closer to the front side of the center pillar 5B.

  In addition, as an example of the present invention, the left side portion of the vehicle body side where the roof side rail 2 and the center pillar 5B are joined has been described as an example, but the present invention is not limited to this. In the case of a vehicle having a quarter pillar between the rear pillar 5C, the present invention can also be applied to a joint portion where the roof side rail 2 and the quarter pillar are joined.

DESCRIPTION OF SYMBOLS 1 Car body 1a Car body side part 3 Joint part 4 Roof arch member 4 (vehicle body part)
5 Pillar 20 Side rail inner 21 Front rail inner 21b Notch 22 Rear rail inner 22b Extension 23 Rail outer (outer panel)
31 1st junction part (joint part)
32 Second joint (joint)
33 Third joint (joint)
34 Fourth joint (joint)
41 Center roof rail (body parts)
41B Pillar upper extension (body parts)
51 Center pillar inner

Claims (5)

A vehicle body side structure having a roof side rail provided above the vehicle body side,
A front rail inner that extends in the front-rear direction, a rear rail inner that is joined to the rear end of the front rail inner and extends rearward, and the front rail inner and the rear rail inner are joined to the roof side rail. A first rail joint, a side rail inner having
A center pillar inner that is joined to one of the vehicle inner side surfaces of the front rail inner and the rear rail inner at a position offset in the front-rear direction with respect to the first joint, and extends downward;
The other of the front rail inner and the rear rail inner is provided with an extending portion extending in the front-rear direction to a position overlapping with the center pillar inner in the vehicle width direction,
The extension part has a second joint part in which the extension part, one of the front rail inner and the rear rail inner, and the center pillar inner are joined .
One of the front rail inner and the rear rail inner is formed of a material having at least one of plate thickness or strength higher than that of the other . A vehicle body side structure having a roof side rail provided above the vehicle body side,
A front rail inner that extends in the front-rear direction, a rear rail inner that is joined to the rear end of the front rail inner and extends rearward, and the front rail inner and the rear rail inner are joined to the roof side rail. A first rail joint, a side rail inner having
A center pillar inner that is joined to one of the vehicle inner side surfaces of the front rail inner and the rear rail inner at a position offset in the front-rear direction with respect to the first joint, and extends downward;
The other of the front rail inner and the rear rail inner is provided with an extending portion extending in the front-rear direction to a position overlapping with the center pillar inner in the vehicle width direction,
The extension part has a second joint part in which the extension part, one of the front rail inner and the rear rail inner, and the center pillar inner are joined.
The front rail inner is formed of a material having a high thickness or at least one of the strength with respect to the rear rail inner,
The center pillar inner is joined to the front rail inner,
The first joint is provided at a position offset backward with respect to the center pillar inner,
The rear rail inner includes the extending portion extending forward to a position overlapping with the center pillar inner in the vehicle width direction,
Wherein the second joint portion, and the extending portion of the rear side rail inner, said front rail inner, the car body side portion structure you characterized in that said center pillar inner, are joined. Vehicle body parts joined to the inside of the center pillar inner in the vehicle width direction,
The front rail inner, the center pillar inner, and a third joint portion to which the vehicle body part is joined,
The extending portion, said third vertical direction with respect to the junction, or, vehicle body side structure according to claim 1 or claim 2, characterized in that it extends to a position offset in the longitudinal direction. The vehicle body part is a center roof rail extending in the vehicle width direction between the center pillar inners provided on both sides in the vehicle width direction,
The vehicle body side part structure according to claim 3, wherein the front rail inner, the center pillar inner, and the center roof rail are joined to the third joint. An outer panel joined to a vehicle lateral outer surface of the side rail inner and the center pillar inner;
Below the second joint portion, the rear rail inner, the center pillar inner, and a fourth joint portion to which the outer panel is joined,
Wherein the rear end of the front rail inner, any one of claims 1-4, characterized in that the cutout portion formed by inclined front side As the downward side is formed Vehicle body side structure as described in 1.

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