JP5277053B2 - Body frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently transmit collision load input to a front side frame to a side sill and absorb it while reducing weight of a vehicle body. <P>SOLUTION: A part F2 of the collision load F1 input to the front side frame 12 is transmitted to the side sill 14 through an outrigger 15, and the other part F3 is transmitted to a tunnel frame 17 through an extension 18. At this time, since a rear end of the front side frame 12 and a front end of the side sill 14 are offset in a left/right direction, bending moment M making the front end of the side sill 14 as fulcrum is applied to the outrigger 15. However, since a front end of a floor frame 20 is connected to a rear edge of the outrigger 15 at a right angle and a rear end of the floor frame 20 is connected to a cross member 19, the rigidity of the outrigger 15 is sufficiently enhanced by the thin floor frame 20 of light weight, and the collision load F1 is efficiently transmitted to the side sill 14. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicle body frame structure for efficiently transmitting and absorbing a collision load input to a front side frame by a frontal collision to a side sill offset with respect to the front side frame.

  The rear end of the front side frame and the front end of the side sill located on the outer side in the left-right direction are connected by an outrigger whose rear side is inclined in the outer side in the left-right direction. Connected to the front end of the tunnel frame with an extension whose rear side is inclined inward in the left-right direction, and to the floor panel covering the outrigger and the upper surface of the extension, a plurality of concentric circles (ripple shape) centering on the connection part between the outrigger and the side sill A vehicle body frame structure in which a bead of) is formed is known from Patent Document 1 below.

JP 2008-265535 A

  By the way, the load of frontal collision input to the front side frame is bifurcated from the rear end of the front side frame, one of which is transmitted to the side sill via the outrigger, and the other is transmitted to the tunnel frame via the extension. Is done. Since the rigidity of the side sill is generally much higher than the rigidity of the tunnel frame, the ratio of the load transmitted to the side sill via the outrigger is larger than the load transmitted to the tunnel frame via the extension. By doing so, it is possible to effectively absorb the collision load.

  However, the conventional one has a problem that the outrigger is bent and deformed rearward around the connecting portion with the side sill due to the collision load input from the front side frame, and the collision load cannot be efficiently transmitted to the side sill. . To avoid this, it is only necessary to increase the strength of the extension and tunnel frame to prevent bending of the outrigger.However, this may increase the weight of the extension and tunnel frame and increase the weight of the vehicle body. is there.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently transmit a collision load input to a front side frame to a side sill and absorb it without increasing the weight of the vehicle body.

To achieve the above object, according to the invention described in claim 1, a pair of left and right front side frames extending in the front-rear direction, and a pair of left and right front sides extending in the front-rear direction behind the front side frame and in the left-right direction outside. A side sill, a pair of left and right outriggers extending obliquely rearward from the rear end of the front side frame and connected to the front end of the side sill, a floor tunnel extending rearward and laterally inward in the front-rear direction of the front side frame, and the floor A pair of left and right tunnel frames provided along left and right side edges of the tunnel, a pair of left and right extensions extending obliquely rearward from the rear end of the front side frame and connected to the front end of the tunnel frame, the pair of left and right side sills, A pair of left and right tunnel frames connected in the left-right direction. Comprising a Sumenba, a pair of right and left floor frames connecting the outrigger and the cross member in the longitudinal direction, the outrigger, said tunnel frame, a floor panel covering their top are connected to the extension and the floor frame The front end of the outrigger and the front end of the extension are connected to the rear end of the front side frame in a Y shape in plan view, and the front end of the floor frame is at a position spaced from the side sill and the extension, respectively. A vehicle body frame structure is proposed, which is connected to the rear edge of the outrigger at a right angle.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the outrigger increases in the front-rear direction width from the connection part to the front side frame toward the connection part to the side sill. A vehicle body frame structure characterized by a triangular shape is proposed.

According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, pre-notated lower panel is provided with a ripple-like beads around the connection portion of the side sill and the outrigger A vehicle body frame structure is proposed in which the floor frame extends in a direction crossing the center of the bead.

Furthermore, according to the invention described in claim 4, in addition to the structure of any one of claims 1 to 3, the rear end of the floor frame is connected to the cross member at a right angle. A vehicle body frame structure is proposed.

According to the configuration of the first aspect, part of the collision load input to the front side frame is transmitted to the side sill via the outrigger, and the other part is Y on the rear end of the front side frame together with the outrigger in a plan view. It is transmitted to the tunnel frame through an extension connected in a letter shape . At this time, since the rear end of the front side frame and the front end of the side sill are offset in the left-right direction, a bending moment acting on the front sill of the side sill acts on the outrigger. Since it is connected at right angles to support the bending moment efficiently, and the rear end of the floor frame is connected to the cross member, the thin and lightweight floor frame can sufficiently enhance the rigidity of the outrigger, and the collision load Can be efficiently transmitted to and absorbed by a highly rigid side sill.

  According to the second aspect of the invention, since the outrigger has a triangular shape in which the width in the front-rear direction increases from the connecting portion to the front side frame toward the connecting portion to the side sill, the rigidity of the outrigger with respect to the bending moment is further increased. It is done. As a result, of the collision load input to the front side frame, the ratio of the load transmitted to the side sill via the outrigger increases and the ratio of the load transmitted to the tunnel frame via the extension decreases. In addition, the weight of the vehicle body can be reduced by reducing the weight of the tunnel frame.

  According to the third aspect of the present invention, since the rippled bead centered on the connecting portion of the side sill and the outrigger is formed on the floor panel, even if the floor frame is thinned to reduce the weight, the bead Stiffness can be increased. In addition, the floor frame extends in a direction that crosses the center of the bead, so that the rigidity of the floor panel can be increased more effectively, and the thickness of the floor panel can be reduced to reduce the weight of the vehicle body. The surface vibration of the floor panel at the time can be prevented.

The figure which looked at the body frame from the vehicle body lower surface side. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a view of a body frame of an automobile as viewed from the lower surface side of a vehicle body. A pair of left and right front side frames 12 and 12 extending in the front-rear direction are disposed on both left and right sides of an engine room 11. The front ends of the frames 12, 12 are connected by a front cross member 13 extending in the left-right direction. Front side frames 12 and 12 support a front subframe (not shown) on which an engine and a suspension are mounted.

  The pair of left and right side sills 14, 14 arranged in the front-rear direction on the left and right sides of the vehicle body have their front ends positioned laterally outward and rearward relative to the rear ends of the pair of left and right front side frames 12, 12. The rear ends of the front side frames 12, 12 and the front ends of the side sills 14, 14 are connected by a pair of left and right outriggers 15, 15. The outriggers 15 and 15 are substantially triangular members extending from the rear ends of the front side frames 12 and 12 outward in the left-right direction and toward the rear, and the width in the front-rear direction is a connecting portion with the front side frames 12 and 12. It gradually increases from a and a toward the connecting portions b and b with the side sills 14 and 14.

  A floor tunnel 16 is disposed in the front-rear direction at the center of the vehicle body sandwiched between the left and right side sills 14, and a pair of left and right tunnel frames 17, 17 are integrally formed along the left and right side edges of the floor tunnel 16. (See FIGS. 1 and 2). The cross-sectional area of the side sills 14 and 14 is larger than the cross-sectional area of the tunnel frames 17 and 17, and the rigidity of the side sills 14 and 14 is significantly higher than the rigidity of the tunnel frames 17 and 17 (see FIG. 2).

A pair of left and right extensions 18, 18 extending inward in the left-right direction and rearward from the rear ends of the front side frames 12, 12 are connected to the front ends of the tunnel frames 17, 17. That is, the front ends of the outriggers 15 and 15 and the front ends of the extensions 18 and 18 are connected to the connecting portions a and a at the rear ends of the front side frames 12 and 12 in a Y shape in plan view . The extensions 18 and 18 are formed integrally with the tunnel frames 17 and 17 by extending the front ends of the tunnel frames 17 and 17 forward (see FIGS. 1 and 4).

  The dashboard lower 22 includes a vertical portion 22a extending in the vertical direction and a horizontal portion 22b extending in the horizontal direction. The front portions of the outriggers 15 and 15 are connected to the lower ends of the vertical portions 22a, and the extensions 18 and 18 are connected. And the front end of the floor tunnel 16 are connected to the rear end of the horizontal portion 22b (see FIGS. 4 and 5). The outriggers 15 and 15 are members whose upper surfaces are open, and a box structure is configured by covering the open portion with the horizontal portion 22b of the dashboard lower 22 (see FIGS. 4 and 5).

  Cross members 19, 19 extending in the left-right direction connect the intermediate portions in the front-rear direction of the side sills 14, 14 and the intermediate portions in the front-rear direction of the floor tunnel 16 and the tunnel frames 17, 17 (see FIGS. 1 and 2). The floor frames 20 and 20 extending in the front-rear direction between the tunnel frames 17 and 17 and the side sills 14 and 14 have their front half bent outward in the left-right direction and connected to the rear edges of the outriggers 15 and 15 at right angles. Are connected to the cross members 19, 19 at right angles (see FIGS. 1 and 5).

The upper surfaces of the tunnel frames 17, 17, the extensions 18, 18, and the floor frames 20, 20, and the rear upper surfaces of the outriggers 15, 15 are covered with a pair of left and right floor panels 21, 21, so that these floor panels 21, 21 are covered. Connected to each . As a result, a box structure is formed between the tunnel frames 17 and 17 and the floor panels 21 and 21 (see FIGS. 2 and 4), and a box structure is formed between the extensions 18 and 18 and the floor panels 21 and 21 (see FIG. 4). A box structure is formed between the floor frames 20 and 20 and the floor panels 21 and 21 (see FIGS. 2 and 5). Of the upper surfaces of the outriggers 15 and 15, the front part is covered with the horizontal part 22b of the dashboard lower 22, while the rear part is covered with the floor panels 21 and 21 to form a box structure (FIGS. 4 and 5). reference)
The left and right outer ends of the floor panels 21 and 21 are connected to the side surfaces of the side sills 14 and 14, and the left and right inner ends of the floor panels 21 and 21 are connected to the side surfaces of the floor tunnel 16 (see FIG. 2).

  The floor panels 21 and 21 are formed with a plurality of concentric (ripple-shaped) beads 21a around the intersections b and b of the side sills 14 and 14 and the outriggers 15 and 15, respectively. Extends in a direction crossing the center of the beads 21a (see FIGS. 1 and 5).

  In FIG. 1, some loads F2, F2 of the collision loads F1, F1 input to the front side frames 12, 12 due to a frontal collision are transmitted to the side sills 14, 14 via the outriggers 15, 15, and the other parts. The loads F3 and F3 are transmitted to the tunnel frames 17 and 17 through the extensions 18 and 18, respectively. At this time, the side sills 14 and 14 located on the left and right sides of the vehicle body have a larger cross-sectional area and higher rigidity than the tunnel frames 17 and 17 located at the center of the vehicle body. Of F1, F1, it is desirable to make the ratio of the loads F2, F2 transmitted to the side sills 14, 14 larger than the ratio of the loads F3, F3 transmitted to the tunnel frames 17, 17, and for this purpose, the outrigger 15, The rigidity of 15 needs to be sufficiently increased.

  As shown in FIG. 1, due to the collision loads F1 and F1 input to the front side frames 12 and 12, the outriggers 15 and 15 have bending moments M and M around the connecting portions b and b with the side sills 14 and 14, respectively. When the outriggers 15 and 15 are deformed by the bending moments M and M, the collision loads F1 and F1 cannot be efficiently transmitted from the front side frames 12 and 12 to the side sills 14 and 14. If the bending moments M and M are to be supported by the reaction force of the loads F3 and F3 of the extensions 18 and 18, the weights of the extensions 18 and 18 and the tunnel frames 17 and 17 increase.

  In contrast, in the present embodiment, the rear edges of the outriggers 15 and 15 and the cross member 19 are connected by the floor frames 20 and 20, and the front ends of the floor frames 20 and 20 are connected to the rear edges of the outriggers 15 and 15. Since they are orthogonal, the bending moments M and M applied to the outriggers 15 and 15 by the collision loads F1 and F1 are efficient due to the reaction forces of the loads F4 and F4 of the floor frames 20 and 20 extending in the direction of the bending moments M and M. Thus, the rigidity of the outriggers 15 and 15 can be increased only by adding the thin and light floor frames 20 and 20 and without particularly reinforcing the extensions 18 and 18 and the tunnel frames 17 and 17. Thus, most of the collision loads F1, F1 can be transmitted to the highly rigid side sills 14, 14 and efficiently absorbed while avoiding an increase in the weight of the vehicle body.

  Further, the floor panels 21 and 21 are formed with ripple-shaped beads 21a around the intersections b and b of the side sills 14 and 14 and the outriggers 15 and 15, so that the floor frames 20 and 20 can be made thin and light. The rigidity of the floor panels 21 and 21 is increased. In particular, since the floor frames 20 and 20 extend in a direction crossing the center of the beads 21a, the rigidity of the floor panels 21 and 21 is further increased, and the necessary rigidity while reducing the thickness and reducing the weight. By ensuring this, it is possible to prevent surface vibration of the floor panels 21 and 21 during traveling.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

12 Front side frame 14 Side sill 15 Outrigger 16 Floor tunnel 17 Tunnel frame 18 Extension 19 Cross member 20 Floor frame 21 Floor panel 21a Bead

Claims (4)

A pair of left and right front side frames (12) extending in the front-rear direction;
A pair of left and right side sills (14) extending in the front-rear direction on the rear side of the front side frame (12) in the left-right direction;
A pair of left and right outriggers (15) extending obliquely rearward from the rear end of the front side frame (12) and connected to the front end of the side sill (14);
A floor tunnel (16) extending in the front-rear direction behind the front side frame (12) in the left-right direction;
A pair of left and right tunnel frames (17) provided along the left and right side edges of the floor tunnel (16);
A pair of left and right extensions (18) extending obliquely rearward from the rear end of the front side frame (12) and connected to the front end of the tunnel frame (17);
A cross member (19) for connecting the pair of left and right side sills (14) and the pair of left and right tunnel frames (17) in the left-right direction;
A pair of left and right floor frames (20) connecting the outrigger (15) and the cross member (19) in the front-rear direction ;
A floor panel (21) connected to the outrigger (15), the tunnel frame (17), the extension (18) and the floor frame (20) and covering the upper surface thereof ,
The front end of the outrigger (15) and the front end of the extension (18) are connected to the rear end of the front side frame (12) in a Y shape in plan view,
The front end of the floor frame (20) is connected to the rear edge of the outrigger (15) at a right angle at a position spaced from the side sill (14) and the extension (18). Construction.   The said outrigger (15) is a triangular shape which the front-back direction width | variety increases toward the connection part to the said side sill (14) from the connection part to the said front side frame (12), It is characterized by the above-mentioned. Body frame structure as described in 1. Before notated lower panel (21) comprises a ripple-shaped bead (21a) around the connecting portion of the side sill (14) and the outrigger (15), said floor frame (17) of the bead (21a) The vehicle body frame structure according to claim 1, wherein the vehicle body frame structure extends in a direction crossing the center. The vehicle body frame structure according to any one of claims 1 to 3, wherein a rear end of the floor frame (20) is connected to the cross member (19) at a right angle.

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