JP2008279889A - Side structure of vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively distribute a collision load exerted on a center pillar in side collision. <P>SOLUTION: A side structure of a vehicle body comprises side sills 5, 6 arranged on right and left sides of the vehicle body and extending in the longitudinal direction of the vehicle body, front cross members 9, 10 and a middle cross member 7 for connecting the right and left side sills 5, 6 to each other in the vehicle width direction, and arranged separately in the longitudinal direction of the vehicle body, a front bulkhead 61 with its substantially entire periphery being joined with inner surfaces of the side sills 5, 6 at the connection parts to the front cross members 9, 10, a rear bulkhead 62 with its substantially entire periphery being joined with inner surfaces of the side sills 5, 6 at the connection parts to the middle cross member 7, and center pillars 81, 82 connected to the side sills 5, 6 in an erected manner at a substantially intermediate point between the front bulkhead 61 and the rear bulkhead 62. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a side part structure of a vehicle body.

In the vehicle body, in order to increase the vehicle body rigidity against external force acting from the side of the vehicle body in the case of a side collision, a bulkhead is placed on the skeleton part (for example, between the side member and the side sill inner) of the vehicle body side part on the vehicle width direction extension of the cross member. It may be provided (see, for example, Patent Document 1).
When the bulkhead is provided in this manner, the load at the time of a side collision can be distributed from the side member to the cross member via the bulkhead.
JP 2004-306777 A

  By the way, the center pillar stands up from the side sill, but when a vehicle with a vehicle height higher than the host vehicle collides with the center pillar, the center sill rotates the side sill around the longitudinal axis via the center pillar. Moment acts. At this time, if the side sill rotates without resisting the rotational moment, there is a problem that the collision load from the side sill to the cross member is not efficiently distributed.

  Therefore, the present invention provides a vehicle body side structure that can effectively disperse a collision load at the time of a side collision.

The vehicle body side structure according to the present invention employs the following means in order to solve the above-described problems.
According to the first aspect of the present invention, a side sill (for example, side sills 5 and 6 in the embodiments described later) disposed on the left and right sides of the vehicle body and the left and right side sills are connected in the vehicle width direction to each other in the vehicle longitudinal direction. The front cross member (for example, the front cross members 9 and 10 in the embodiments described later) and the middle cross member (for example, the middle cross member 7 in the embodiments described later) that are spaced apart are connected to the front cross member. The front bulkhead (for example, the front bulkhead 61 in the embodiment described later) joined to the inner surface of the side sill in the portion and the inner surface of the side sill in the connecting portion of the middle cross member. The joined rear bulkhead (for example, in the embodiments described later) A rear bulkhead 62), and center pillars (for example, center pillars 81 and 82 in the embodiments described later) connected to the side sill in a standing posture at a substantially middle point between the front bulkhead and the rear bulkhead. It is a vehicle body side part structure characterized by providing.

  With this configuration, the front bulkhead and the front cross member can be arranged substantially in alignment, the rear bulkhead and the middle cross member can be arranged almost in alignment, and the front bulkhead can be arranged. Since the head and rear bulkhead are almost entirely joined to the inner surface of the side sill, a vehicle with a high vehicle height collides with the center pillar, and a rotational moment around the longitudinal axis acts on the side sill via the center pillar. In this case, the rotational moment can be resisted by the front cross member and the middle cross member, and the side sill can be prevented from rotating. Since the side sill is prevented from rotating, the collision load acting on the center pillar can be efficiently transmitted to the front cross member and the middle cross member via the side sill.

The invention according to claim 2 is the invention according to claim 1, wherein the front cross member is a pair of side wall members (for example, a front side wall 51 and a rear side wall 52 in an embodiment described later), The upper wall member (for example, the upper wall 53 in the embodiment described later) connecting the upper portions of the pair of side wall members is configured, and one plate thickness of the upper wall member and the side wall member is thicker than the other plate thickness. It is characterized by that.
By comprising in this way, weight reduction can be achieved, ensuring the intensity | strength required for a front cross member.

According to a third aspect of the present invention, in the first aspect of the present invention, the front slope of the outer wall of the side sill is gradually increased outwardly from the front end and the rear end toward the vehicle front-rear center. A wall (for example, a front inclined wall 25F in an embodiment described later) and a rear inclined wall (for example, a rear inclined wall 25R in an embodiment described later) are provided.
By comprising in this way, the impact load which acts from a side sill at the time of a side collision can be disperse | distributed also to a vehicle body skeleton member from the front inclination wall and rear inclination wall of a side sill.

The invention according to claim 4 is the invention according to claim 1, wherein the front cross member is higher in the vehicle width direction outside than the center in the vehicle width direction, and the upper end of the front cross member in the vehicle width direction is the front bulk. It is characterized by being almost the same height as the upper end of the head.
With such a configuration, the rigidity of the vehicle body can be improved while keeping the height of the front cross member low.

  According to the first aspect of the present invention, the side sill can be prevented from rotating at the time of a side collision, so that the collision load acting on the center pillar at the time of the side collision can be efficiently distributed to the front cross member and the middle cross member. , Body rigidity is improved. Moreover, since the load burden on the center pillar can be reduced at the time of a side collision, the displacement and deformation of the center pillar toward the passenger compartment can be reduced.

According to the invention which concerns on Claim 2, weight reduction can be achieved, ensuring the intensity | strength required for a front cross member, and it can contribute to a fuel-consumption improvement.
According to the invention of claim 3, since the impact load acting from the side sill at the time of the side collision can be distributed to the vehicle body frame member from the front inclined wall and the rear inclined wall of the side sill, the load of the center pillar at the time of the side collision The burden can be further reduced, and the displacement and deformation of the center pillar toward the passenger compartment can be further reduced.
According to the invention which concerns on Claim 4, since the height of a front cross member can be restrained low, a vehicle interior space can be expanded.

  Embodiments of a vehicle body side part structure according to the present invention will be described below with reference to the drawings of FIGS. In the following description, the vertical direction, the front-rear direction, and the left-right direction correspond to the vertical direction, front-rear direction, and left-right direction of the vehicle body.

  As shown in FIGS. 1 and 2, a floor tunnel frame 2 extending in the longitudinal direction of the vehicle body is formed at the center of the vehicle width direction on the floor 1 of the vehicle. The inner edges of the left and right floor panels 3, 4 are joined to both side edges of the floor tunnel frame 2, and the left and right side sills 5 that are vehicle body skeleton members that extend in the vehicle longitudinal direction to the outer edges of the left and right floor panels 3, 4, respectively. , 6 are attached. The rear portions of the left and right side sills 5 and 6 are connected to each other by a middle cross member 7 that is a vehicle body skeleton member, and the front edge portion of the middle cross member 7 is joined to the rear edges of the left and right floor panels 3 and 4. Further, a substantially central portion in the front-rear direction of the floor tunnel frame 2 and the left and right side sills 5, 6 are connected by left and right front cross members 9, 10, respectively.

  On the other hand, one end of each of the extensions 11 and 12 is joined to both side walls of the front end of the floor tunnel frame 2, and one end of each of the outriggers 13 and 14 is joined to each of the front ends of the left and right side sills 5 and 6, respectively. The left and right extensions 11 and 12 are connected to the inner walls of the outriggers 13 and 14. In this embodiment, the floor 1 is mainly composed of the floor panels 3 and 4 and the floor tunnel frame 2.

  As shown in FIG. 3, the floor tunnel frame 2 includes a tunnel main body 19 bulged so as to protrude above the floor panels 3 and 4 by an upper wall 17 and inclined side walls 18 and 18, and this tunnel. The wings 21 and 21 are extended to the lower side of the left and right floor panels 3 and 4, then extended horizontally outward and welded to the lower surfaces of the floor panels 3 and 4 by the flange portion 20. It consists of and. A flange portion 22 is raised and formed on the inner edges of the left and right floor panels 3 and 4, and the flange portion 22 is welded to both side walls 18 and 18 of the tunnel body 19 of the floor tunnel frame 2. Therefore, on both sides of the floor tunnel frame 2, under the floor panels 3, 4, a closed body that extends in the longitudinal direction of the vehicle body formed by the wing portions 21, 21 of the floor tunnel frame 2 and the floor panels 3, 4. A cross-sectional structure portion H1 is formed.

  The side sills 5 and 6 include a side sill inner 23 formed in a convex shape on the vehicle interior side, a rain force 25 that is joined together with the side sill inner 23 at upper and lower joining flange portions 24 and 24 to form a closed cross-section structure portion, A closed cross-section structure portion is formed outside the reinforcement 25, and the side sill outer 8 is joined to the joining flange portion 24. The side sill inner 23 is formed in the same cross-sectional shape over almost the entire length, but as shown in FIGS. 1 and 2, the reinforcement 25 gradually protrudes outward from the front end and the rear end toward the center in the front-rear direction. A maximum projecting closed cross-section structure portion H2 having a front sloping wall 25F and a rear sloping wall 25R that increase in size and having a maximum projecting dimension to the outside of the reinforcement 25 is formed over a predetermined length in the vehicle longitudinal direction. Inclined closed cross-section structures HF2 and HR2 are formed before and after the maximum projecting closed cross-section structure H2. The maximum projecting closed cross-section structure portion H <b> 2 is disposed between the middle cross member 7 and the front cross members 9 and 10. A flange portion 27 raised from the outer edges of the left and right floor panels 3 and 4 is joined to the inner wall 26 of the side sill inner 23.

As shown in FIG. 4, the middle cross member 7 has two members having a substantially L-shaped cross section disposed opposite to each other, and a rear upper edge flange portion 28 and a front lower edge flange portion 29 are welded to each other to floor panels 3, 4. A substantially rectangular closed cross-section structure portion H3 serving as a vehicle body skeleton portion is formed on the upper surface. As shown in FIGS. 1 and 2, the middle cross member 7 includes a straight portion 71 that extends perpendicular to the longitudinal direction of the vehicle body, and a forward inclined portion 72 that is bent and formed obliquely forward from the left and right ends of the straight portion 71 in plan view. , 72, and the forward inclined portions 72, 72 are gradually lowered in height toward the outside of the vehicle body, and their tips are flush with the upper wall 31 of the side sill inner 23. The flange portions 73 and 74 formed at the ends of the forward inclined portions 72 and 72 of the middle cross member 7 are joined to the inner wall 26 and the upper wall 31 of the side sill inner 23, and the front lower edge flange portion 29 is a left and right floor panel. It is welded to the trailing edges of 3 and 4.
The front end portions of the rear side frames 15 and 16 as the left and right body frame members are connected to the rear wall 30 of the front inclined portions 72 and 72 of the middle cross member 7 and the rear inner walls of the left and right side sills 5 and 6.

  As shown in FIG. 4, the front cross members 9, 10 have an upper wall (upper wall member) 53 having a U-shaped cross section at the upper portion of a front side wall (side wall member) 51 and a rear side wall (side wall member) 52 having an L-shaped cross section. It is a member formed in a hat shape opened to the lower side by joining, and the flange portion 54 of the front side wall 51 and the flange portion 55 of the rear side wall 52 are joined to the upper surfaces of the left and right floor panels 3, 4. A closed cross-section structure portion H4 that becomes a vehicle body skeleton portion along the vehicle width direction is formed on the upper surface of the third and fourth surfaces. In this embodiment, the front side wall 51 and the rear side wall 52 have the same plate thickness, but the upper wall 53 is thicker than the front side wall 51 and the rear side wall 52. By joining the members, the overall weight of the front cross members 9 and 10 is ensured and the weight is reduced.

  As shown in FIG. 1, the end portions 56 of the front cross members 9, 10 on the side sill 5, 6 side gradually increase in height as they approach the side sill inner 23, and the outer ends thereof are It is the same height as the upper wall 31. Flange portions 57 and 58 formed at the outer ends of the front cross members 9 and 10 are joined to the inner wall 26 and the upper wall 31 of the side sill inner 23. As shown in FIGS. 1 and 2, the inner ends of the front cross members 9 and 10 are the front flange portion 32 and the rear flange portion 33 on the outer surface of the side wall 18 of the floor tunnel frame 2, and the edge of the upper wall 34 is the floor tunnel frame. 2 is joined to the upper wall 17.

Here, as shown in FIG. 3, a joint frame 35 is joined to the back side of the tunnel main body 19 of the floor tunnel frame 2 at a position connecting the left and right front cross members 9 and 10. The joint frame 35 is a hat-shaped cross-section member that is open on the upper side opposite to the front cross members 9 and 10, and the lower wall 36 is aligned with the floor panels 3 and 4. The front flange 37 and the rear flange 38 (see FIGS. 1 and 2) of the joint frame 35 are joined to the back side of the tunnel body 19, and both end edges 39, 39 of the lower wall 36 are the back side of the tunnel body 19 of the floor tunnel frame 2. It is joined to.
As a result, a closed cross-section structure portion H5 is formed between the joint frame 35 and the floor tunnel frame 2, and this closed cross-section structure portion H5 is formed between the left and right front cross members 9, 10 and the floor panels 3, 4. Thus, a substantially continuous vehicle body skeleton member is formed which is connected to the closed cross-section structure portion H4 and connects the side sills 5 and 6 along the vehicle width direction.

  As shown in FIGS. 1 and 2, the side sills 5 and 6 include a front end of the maximum projecting closed cross-section structure portion H <b> 2 in the closed cross-section structure portion formed between the side sill inner 23 and the reinforcement 25. A front bulkhead 61 and a rear bulkhead 62 are joined to the rear end. As shown in FIGS. 8 and 10, both the front bulkhead 61 and the rear bulkhead 62 are closed portions 63 and 64 having substantially the same shape and dimensions as the closed cross section of the maximum projecting closed cross section structure portion H <b> 2. The plurality of flange portions 65 and 66 are formed to be bent at a right angle from substantially the entire circumference of the portions 63 and 64.

  As shown in FIGS. 8 and 9, the rear bulkhead 62 is arranged so that the rear end of the maximum projecting closed cross-section structure portion H2 is closed by the closing portion 64, and each flange portion 66 faces the front of the vehicle body and It is joined to the inner wall surface and the inner wall surface of the reinforcement 25. That is, the rear bulkhead 62 is joined to the inner surfaces of the side sills 5 and 6 almost entirely. In particular, as shown in FIG. 9, the flange portion 66 joined to the inner wall surface of the inner wall 26 of the side sill inner 23 has a flange portion 73 on the front side of the forward inclined portion 72 of the middle cross member 7 across the inner wall 26. These flange portions 66, the inner wall 26, and the flange portion 73 are integrally joined. As a result of the installation as described above, the closing portion 64 of the rear bulkhead 62 is arranged substantially in alignment with the front wall 75 of the middle cross member 7.

  Further, as shown in FIGS. 10 and 11, the front bulkhead 61 is disposed so as to close the front end of the maximum projecting closed cross-section structure portion H2 with the closing portion 63, and the side sill inner 23 with the flange portions 65 facing the rear of the vehicle body. And the inner wall surface of the reinforcement 25 are joined. That is, the front bulkhead 61 is joined to the inner surfaces of the side sills 5 and 6 almost entirely. In particular, as shown in FIG. 11, the flange portion 65 joined to the inner wall surface of the inner wall 26 of the side sill inner 23 has a flange portion 57 on the rear side of the outer end of the front cross members 9 and 10 with the inner wall 26 interposed therebetween. The flange portion 65, the inner wall 26 and the flange portion 57 are integrally joined. As a result of the installation as described above, the blocking portion 63 of the front bulkhead 61 is arranged in alignment with the rear side walls 52 of the front cross members 9 and 10 in substantially the same plane.

  As shown in FIG. 5, one end side of the left and right extensions 11, 12 is formed in a shape opened upward so as to cover the entire surface of the wing portion 21 of the floor tunnel frame 2 from below. The portion of the floor panels 3 and 4 that reaches the flange portion 22 is joined to the back surface of the side wall 18 of the tunnel main body 19 of the floor tunnel frame 2. An outer flange portion 41 on one end side of the extensions 11 and 12 is superposed on the flange portion 20 of the wing portion 21.

  On the other hand, one end of the outriggers 13, 14 is connected to the lower wall 43 joined to the lower wall 42 of the side sill inners 23, 23, and the lower wall 43 extends to the lower surface of the flow panels 3, 4. The closed cross-section structure portion H6 is formed between the side sills 5 and 6 and the floor panels 3 and 4.

The extensions 11 and 12 and the outriggers 13 and 14 formed in this way are gradually formed along the rear surface of the dashboard panel 45 joined to the upper surface of the front edge of the floor panels 3 and 4 as shown by a chain line in FIG. As shown in FIGS. 6 and 7, the lower wall 46 of the extensions 11 and 12 is joined to the lower wall 43 of the outriggers 13 and 14 whose front side has a hat-shaped cross section. Both are connected. That is, the front end portion of the floor tunnel frame 2 and the front end portions of the left and right side sills 5 and 6 are connected in the vehicle width direction by the extensions 11 and 12 and the outriggers 13 and 14, and the extensions 11 and 12 and the outriggers 13 and 14 are A transverse skeleton member is formed.
A rear end of a front side frame (not shown) as a vehicle body frame member is connected to the front end of the outrigger 13. 6 and 7, a dashed line indicates a dashboard panel 45 that forms a closed section structure portion H6 between the outriggers 13 and 14 and the extensions 11 and 12.

  As shown in FIGS. 1 and 2, center pillars 81 and 82 are attached to the side sills 5 and 6 in an upright posture at substantially the midpoint between the front bulkhead 61 and the rear bulkhead 62. The center pillars 81 and 82 are formed by joining a center pillar stiffener 83 and a center pillar inner 84 with joint flange portions 85 and 86 into a closed cross-sectional structure of a predetermined shape. Between the center pillar stiffener 83 and the center pillar inner 84, the joining flange portion 24 of the side sills 5 and 6 is sandwiched. The center pillar stiffener 83 and the lower end flange portions 87 and 88 of the center pillar inner 84 are joined to the reinforcement 25 and the side sill inner 23 of the side sills 5 and 6.

  According to the vehicle body side part structure thus configured, a vehicle having a vehicle height higher than that of the own vehicle collides with the center pillar 81 on the left side of the own vehicle, for example, and collides with the center pillar 81 as shown in FIG. When a load (arrow F) is applied, a rotational moment (arrow M) around the longitudinal axis acts on the side sill 5 via the center pillar 81, but the front bulkhead 61 is disposed on both sides of the center pillar 81 in the side sill 5. And the rear bulkhead 62 are fixedly joined to the inner surface of the side sill 5 at almost the entire circumference, and the closing portion 63 of the front bulkhead 61 is aligned with the rear side wall 52 of the front cross member 9 in substantially the same plane. In addition, the closing portion 64 of the rear bulkhead 62 is disposed substantially in alignment with the front wall 75 of the middle cross member 7, so that the rotational moment M is Can resist the cross member 7 and the front cross member 9, it is possible to side sill 5 from rotating.

  Since the side sill 5 is prevented from rotating, the collision load F transmitted from the center pillar 81 to the side sill 5 is efficiently transmitted to the middle cross member 7, the front cross member 9, and the floor panel 3, and the side sill 5 Are transmitted to the front inclined wall 25F and the rear inclined wall 25R of the reinforce 25 and distributed to the outrigger 13 and the middle cross member 7 as well. Further, it is also transmitted to a front side frame joined to the outrigger 13 and a rear side frame 15 joined to the side sill 5.

  Furthermore, part of the load acting on the side sill is a closed cross-section structure portion H4 formed between the front cross member 9 and the floor panel 3, and a closed portion formed between the joint frame 35 and the floor tunnel frame 2. It is also transmitted to the side sill 6 side through the cross-sectional structure portion H5 and the closed cross-sectional structure portion H4 formed between the front cross member 10 and the floor panel 4.

  Accordingly, since the collision load F that normally acts on the center pillar 81 can be distributed and distributed to a wide range of members, the load on the center pillar 81 can be reduced, and as a result, the vehicle of the center pillar 81 can be reduced. Deviation to the chamber side and deformation can be reduced.

Further, the front cross members 9 and 10 are divided into three members: a thin front wall 51 and a rear side wall 52 and a thick plate upper wall 53, and these three members 51, 52 and 53 are joined. As a result, the strength required for the front cross members 9 and 10 is ensured as a whole, so that the weight can be reduced and the fuel consumption can be improved.
Further, the front cross members 9 and 10 can advantageously increase the vehicle body rigidity while keeping the height low except for the end portions 56 on the side sills 5 and 6 side, which is advantageous in that the vehicle interior space can be expanded.

  In addition, as a result of performing the side collision experiment on the vehicle body side structure of the embodiment, the reaction force of the front cross member 9 can be increased by 20% with respect to the collision load F to the center pillar 81, and the middle cross The reaction force of member 7 could be increased by 90%. It was also confirmed that the amount of displacement of the lower end of the center pillar 81 toward the passenger compartment was reduced.

[Other Examples]
The present invention is not limited to the embodiment described above.
For example, the installation position of the center pillar may not be an exact middle point between the front bulkhead and the rear bulkhead, and may be slightly shifted.
In the embodiment described above, the plate thickness of the upper wall member of the front cross member is made thicker than the plate thickness of the side wall member, but the plate thickness of the side wall member may be made thicker than the plate thickness of the upper wall member. Alternatively, instead of dividing the upper wall member and the side wall member, one panel may be press-molded to integrally form the front cross member, and the plate thickness may be the same.

It is a principal part external appearance perspective view in the Example of the vehicle body provided with the vehicle body side part structure which concerns on this invention. It is a top view of the vehicle body principal part in the said Example. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is CC sectional drawing of FIG. It is BB sectional drawing of FIG. It is AA sectional drawing of FIG. It is a perspective view which shows through the attachment part of a front bulkhead in the vehicle body of the said Example. It is a cross-sectional view of the mounting part of the front bulkhead. FIG. 3 is a perspective view showing a rear bulkhead mounting portion in a perspective view in the vehicle body of the embodiment. It is a cross-sectional view of the mounting portion of the rear bulkhead.

Explanation of symbols

5,6 Side sill 7 Middle cross member 9, 10 Front cross member 25F Front inclined wall 25R Rear inclined wall 51 Front side wall (side wall member)
52 Rear side wall (side wall member)
53 Upper wall (upper wall member)
61 Front bulkhead 62 Rear bulkhead 81, 82 Center pillar

Claims (4)

Side sills that are arranged on the left and right sides of the vehicle and extend in the longitudinal direction
A front cross member and a middle cross member connected to the left and right side sills in the vehicle width direction and spaced apart from each other in the longitudinal direction of the vehicle body;
A front bulkhead in which the entire circumference is joined to the inner surface of the side sill in the connecting portion with the front cross member;
A rear bulkhead having the entire circumference joined to the inner surface of the side sill at the connecting portion with the middle cross member;
A center pillar connected in a standing posture to the side sill at a substantially middle point between the front bulkhead and the rear bulkhead;
A vehicle body side structure characterized by comprising:   The front cross member includes a pair of side wall members disposed opposite to each other and an upper wall member that connects upper portions of the pair of side wall members, and the thickness of one of the upper wall member and the side wall member is set to the other thickness. The vehicle body side part structure according to claim 1, wherein the vehicle body side part structure is thicker than the plate thickness.   2. A front inclined wall and a rear inclined wall are provided on the outer wall of the side sill, the front inclined wall and the rear inclined wall being gradually increased outwardly from the front end and the rear end toward the vehicle longitudinal direction center. Vehicle body side structure as described.   The front cross member is higher in the vehicle width direction than the center in the vehicle width direction, and the upper end of the front cross member in the vehicle width direction is substantially the same height as the upper end of the front bulkhead. 1. The vehicle body side structure according to 1.

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