JP5458741B2 - Body frame structure - Google Patents

Description

  The present invention relates to a vehicle body skeleton structure that forms a skeleton of a vehicle body such as an automobile.

  In Patent Document 1, as an example of the vehicle body skeleton structure, a center pillar reinforcement is extended in the side sill, and a side sill reinforcement extending along the side sill and the wheel panel house is provided from the extended part, and a side collision is provided. A vehicle body side structure that prevents internal folding at times is shown.

  However, in the structure of Patent Document 1, the side sill reinforcement is a large member extending from the extended portion (in the vicinity of the center pillar) to the rear wheel house, which causes an increase in weight.

JP-A-5-69859

  In view of the above facts, an object of the present invention is to obtain a vehicle body skeleton structure that can effectively suppress internal folding at the time of a side collision with a lightweight structure.

According to the first aspect of the present invention, the pair of side rails that extend in the vehicle front-rear direction on both sides in the vehicle width direction to form the skeleton of the vehicle body, and the width that narrows the gap between the pair of side rails on the vehicle front side. A narrow portion and a wide portion that is wide at the rear side of the vehicle and an inclined portion that continues from the narrow portion to the wide portion are configured. The wide portion extends in the vehicle width direction to connect the side rail, and A plurality of cross members arranged in the front-rear direction and a reinforcement that locally reinforces the side rail against a load from the side between the plurality of cross members and outside the seating position of the vehicle in the vehicle width direction And the side rail at a specific part between the connecting part of the cross member and the reinforcing means which are relatively close to the reinforcing means, and outside the seating position of the vehicle in the vehicle width direction From the side Having a weakening means for locally vulnerable to load.

In this vehicle skeleton member, a narrow portion on the vehicle front side, a wide portion on the vehicle rear side, and an inclined portion continuous from the narrow portion to the wide portion are configured on the pair of side rails, and a plurality of the wide portions are arranged in the wide portion. Side rails are connected by a cross member. And the side rail is locally reinforced with the reinforcement means with respect to the load from a side between the some cross members and the vehicle width direction outer side of the seating position of a vehicle . When the load due to the side impact acts on the reinforcing portion of the side rail by the reinforcing means from the outside in the vehicle width direction, since the side rail is reinforced by the reinforcing means at this reinforcing portion, excessive deformation can be suppressed. Moreover, the side rail is a specific part between the connecting part of the cross member located relatively close to the reinforcing means and the reinforcing means, and outside the seating position of the vehicle in the vehicle width direction by the weakening means. Since it is weakened locally with respect to the load from the side, the side rail can be deformed and absorb the energy of the side collision at the weak part. In addition, since the wide portions of the pair of side rails are connected by a plurality of cross members, the load acting on one side rail also acts on the other side rail by the cross member. In particular, compared to a configuration in which a weakening means is provided between a connection part relatively far from the reinforcing means and the reinforcing means, the amount of deformation of the side rail at the weakened part is ensured and more reliable energy absorption is possible. become. Since the amount of deformation of the side rail at the fragile portion is increased, the amount of deformation of the side rail at the reinforcing portion is reduced, and as a result, the effect of suppressing the internal folding at the time of side collision is increased.

  Thus, in the vehicle skeleton member of the present invention, the internal folding at the time of a side collision can be effectively suppressed. In addition, since it is not necessary to arrange a large member such as a conventional side sill reinforcement, the structure is light.

According to a second aspect of the present invention, in the first aspect of the present invention, the reinforcing means includes a reinforcing member attached to the side rail.

  Thus, a reinforcement means can be comprised with the simple structure which attaches a reinforcement member to a side rail, and a side rail can be reinforced locally. In combination with the reinforcing member, for example, other reinforcing means (for example, locally increasing the cross-sectional area of the side rail itself) may be applied, but it is not always necessary to provide such other reinforcing means, A general thing can be used as a side rail.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a part of the side rail is divided in the vehicle front-rear direction, and the weakening means is configured as a divided portion of the side rail. Has been.

  In this way, by using the part of the side rail that is partly divided into the front and rear, the weakening means can be configured with a simple structure, and the side rail can be weakened locally.

The invention according to claim 4 is the invention according to any one of claims 1 to 3 , wherein the reinforcing means is provided on the outer side in the vehicle width direction of the position of the occupant assumed in the vehicle. Is reinforced.

  Since the side rails on the outer side in the vehicle width direction are reinforced when viewed from the occupant, the occupant can be more reliably protected during a side collision.

  Since this invention was set as the said structure, it can suppress the internal folding at the time of a side collision effectively with a lightweight structure.

It is a top view which shows partially the vehicle body frame to which the vehicle frame structure of 1st Embodiment of this invention was applied. The state of a deformation | transformation when a collision body collides with a vehicle body frame from the side is shown, (A) is a comparative example, (B) is a case of 1st Embodiment. It is a top view which shows partially the vehicle body frame to which the vehicle frame structure of the reference example of this invention was applied.

  FIG. 1 shows a vehicle skeleton structure 12 according to an embodiment of the present invention. In FIG. 1, the front of the vehicle having the vehicle skeleton structure 12 is indicated by an arrow FR, and the right side in the vehicle width direction is indicated by an arrow RI.

  The vehicle skeleton structure 12 has a pair of left and right side rails 16 extending in the vehicle front-rear direction. The left and right side rails 16 are connected to each other at a connecting portion 20 by a plurality of cross members 18 extending in the vehicle width direction, whereby a substantially ladder-shaped body frame 14 is configured. Further, the side rail 16 is configured by joining an outer channel 24 positioned relatively outside in the vehicle width direction and an inner channel 22 positioned inside in the vehicle width direction. The outer channel 24 and the inner channel 22 are formed of a metal material such as a steel material having a substantially U-shaped cross-sectional shape in a cross section in the vehicle width direction, for example. And the outer channel 24 and the inner channel 22 are joined so that the open part of this U-shaped cross section may mutually oppose, and the side rail 16 which has a hollow closed cross section as a whole is comprised.

  The side rail 16 is formed with an inclined portion 16S that is inclined inward in the vehicle width direction so as to approach each other at a position closer to the front in the vehicle front-rear direction. The vehicle rear side of the inclined portion 16S is a wide portion 16W having a relatively large interval, and the vehicle front side is a narrow portion 16N. For example, a front wheel, a suspension, or the like is arranged at a position outside the narrow portion 16N in the vehicle width direction.

  A bracket for connecting and supporting other members for constituting the automobile is attached to a predetermined position of the side rail 16. In the example shown in FIG. 1, a suspension bracket 26 is attached to the narrow portion 16N, and a cab mount bracket 28 is attached to the inclined portion 16S.

  A reinforcement 30 is attached to the inner channel 22 constituting the side rail 16 at a position on the outer side in the vehicle width direction when viewed from the seating position of the occupant PS of the vehicle (position where the occupant seat is disposed in the vehicle). Yes. The reinforce 30 is disposed locally (only in the vicinity of the occupant PS) in the vehicle front-rear direction, and a portion where the reinforce 30 is disposed is a reinforcement portion 32 in which the side rail 16 is locally reinforced. . The specific structure of the reinforcement 30 is not particularly limited as long as the side rails 16 can be reinforced. For example, a simple plate-shaped steel plate or the like may be used, but for example, a substantially U-shaped or H-shaped cross section. If formed in this way, as will be described later, it is possible to effectively suppress the internal folding of the side rail 16 at the time of a side collision.

  As can be seen from FIG. 1, in this embodiment, the distance D1 between the reinforcement 30 and the connecting portion 20 of the front and rear cross members 18 is the distance D1 between the front cross member 18A and the rear cross member. It is shorter than the distance D2 with 18B. The outer channel 24 includes a front outer channel 24A on the front side of the vehicle and a rear outer channel 24B on the rear side of the vehicle between the connecting portion 20 and the reinforcing portion 32 of the cross member 18A on the front side, which are relatively short in distance. It is divided into

  In this divided portion, the inner channel 22 is not divided, and the front outer channel 24A and the rear outer channel 24B on the vehicle rear side are joined by the inner channel 22 and further joined by welding or the like. . However, the side rail 16 is fragile in this divided portion (joint portion), and the fragile portion 34 of the present invention is configured.

  Next, the operation of the vehicle skeleton structure 12 of the present embodiment will be described.

  As shown in FIG. 2, the collision body CB is assumed to collide with the vehicle (side collision) from the outside in the vehicle width direction when viewed from the seating position of the occupant PS (see FIG. 1), and the load is applied to one side rail 16. In contrast, consider the case of acting on the inside in the vehicle width direction. FIG. 2B schematically shows how the vehicle skeleton structure 12 is deformed when the collision body CB collides in this way. FIG. 2A schematically shows a state of deformation in the case where the collision body CB collides similarly in the vehicle skeleton member 102 of the comparative example. In the vehicle skeleton structure 102 of this comparative example, the pair of side rails 104 is not provided with the reinforcing means (reinforcing part 32) or the weakening means (fragile part 34) of the present invention.

  In the vehicle skeleton structure 12 of the present embodiment, the side rail 16 is reinforced by the reinforcement 30 at the position where the collision body CB collides, and the inward folding of the side rail 16 when the collision body CB collides is suppressed. Yes. In addition, since the cross member 18A connects the left and right side rails 16 at a distance D1 from the reinforcing part 32 (a position relatively close to the reinforcing part 32), a load applied to one side rail 16 is reduced. The portion is transmitted to the other side rail 16 mainly by the cross member 18A (see arrow F1 in FIG. 1). That is, the deformation due to the load applied from the collision body CB is dispersed not only in the one side rail 16 but also in the other side rail 16, and the other side rail is also slightly deformed (extended).

  In addition, in the vehicle skeleton structure 12 of the present embodiment, a fragile portion 34 is formed on the side rail 16 between the reinforcing portion 32 and the connecting portion 20 of the cross member 18A. Therefore, the side rail 16 is deformed so as to be broken at the fragile portion 34 by the load from the collision body CB. That is, the amount of inward folding BL toward the inner side in the vehicle width direction of the side rail 16 is smaller than the structure in which the deformation occurs only at the reinforcing portion 32.

  On the other hand, in the vehicle skeleton structure 102 of the comparative example, since the part where the collision body CB collided at the time of the side collision is not particularly reinforced, the side rail 16 is greatly deformed inward in the vehicle width direction at the collision part. Further, in the vehicle skeleton structure 102 of the comparative example, the deformation of the side rail 16 absorbs the collision load (energy) and the cross members 18A and 18B are also bent as a whole. The rail 16 is not deformed. Therefore, the inward folding amount BL of the side rail 16 on the side on which the load from the collision body CB acts is large.

  As described above, in the vehicle skeleton structure 12 of the present embodiment, the inward folding amount BL of the side rail 16 at the time of a side collision can be reduced, and a large member such as a conventional side sill reinforcement is unnecessary. It becomes a lightweight structure.

In the above description, the weakening means (fragile portion 34) of the present invention is provided between the reinforcing portion 32 and the connecting portion 20 of the cross member 18A on the side close to the reinforcing portion 32. For example, FIG. Like the vehicle skeleton structure 52 of the reference example , it may be provided between the reinforcing portion 32 and the connection pair of the cross member 18B on the far side. The vehicle skeleton structure 52 of the reference example has the same configuration as the vehicle skeleton structure 12 of the first embodiment except for this.

  Thus, the degree of freedom in designing the vehicle body frame 14 is increased by changing the portion where the fragile portion 34 is provided. In contrast, as in the first embodiment, in the structure in which the fragile part 34 is provided between the reinforcing part 32 and the connecting part 20 of the cross member 18A on the side close thereto, the collision body CB at the time of a side collision is provided. Since the amount of deformation at the fragile portion 34 of the side rail 16 due to the load from the side rail 16 can be secured, the amount of inward folding of the side rail 16 is reduced by reducing the amount of inward folding BL of the side rail 16 at the reinforcing portion 32. The effect of reducing increases.

  Moreover, in the above, although the reinforcement 30 attached to the side rail 16 is mentioned as a reinforcement means of this invention, a reinforcement means is not limited to this. For example, as a reinforcing means other than the reinforcement 30, it is also conceivable to increase the cross-sectional area of the side rail 16 itself. In this case, however, the design of the side rail 16 is changed. On the other hand, when the reinforcement 30 is attached to the side rail 16 as in the above-described embodiment, it is not necessary to change the structure and shape of the side rail 16, and it is possible to use a common side rail 16. . In addition, it is also possible to use together the reinforcement 30 and the reinforcement means other than this (structure which enlarges the cross-sectional area of the above-mentioned side rail 16) as a reinforcement means.

  The reinforcing portion 32 by the reinforcing means is not limited as long as it is a portion that can suppress excessive deformation of the side rail 16 with respect to the load from the collision body CB at the time of a side collision, but as described above, the occupant PS of the vehicle If the position on the outer side in the vehicle width direction is reinforced when viewed from the seating position, the occupant can be effectively protected during a side collision.

  As the weakening means of the present invention, in the above description, the outer channel 24 is divided into the front outer channel 24A and the rear outer channel 24B, so that the weakening means is configured as a divided part (joining part). However, it is not limited to this. For example, the weakening means may be configured by reducing the cross-sectional area of the outer channel 24 itself without dividing the outer channel 24 forward and backward. In practice, for example, the side rail 16 (outer channel 24) may be divided into front and rear parts due to manufacturing reasons, etc., so that if this is used, the weakening means can be configured with a simple structure. become. Furthermore, the weakening means of the present invention may be configured by locally reducing the cross-sectional area in the vehicle width direction (direction orthogonal to the longitudinal direction) by making a cut or the like in the side rail 16.

12 Vehicle skeleton structure 14 Body frame 16 Side rail 18 Cross member 20 Connection part 22 Inner channel 24 Outer channel 30 Reinforce 32 Reinforcement part 34 Fragile part 52 Vehicle skeleton structure BL Inward folding amount CB Colliding body PS Crew

Claims (4)

A pair of side rails extending in the vehicle longitudinal direction on both sides in the vehicle width direction and constituting the skeleton of the vehicle body;
A narrow part that narrows the distance between the pair of side rails on the front side of the vehicle, a wide part that widens on the rear side of the vehicle, and an inclined part that continues from the narrow part to the wide part are configured . A cross member extending in the vehicle width direction and connecting the side rails, and a plurality of cross members arranged in the vehicle front-rear direction;
Reinforcing means for locally reinforcing the side rail against a load from the side between the plurality of cross members and outside the seating position of the vehicle in the vehicle width direction ;
The side rail is located at a specific part between the connection part of the cross member and the reinforcement means that are relatively close to the reinforcement means, and laterally outside the seating position of the vehicle in the vehicle width direction. Weakening means to make it locally vulnerable to the load from
A vehicle body skeleton structure.   The vehicle body skeleton structure according to claim 1, wherein the reinforcing means includes a reinforcing member attached to the side rail. A part of the side rail is divided in the vehicle longitudinal direction,
The vehicle body skeleton structure according to claim 1, wherein the weakening means is configured as a divided portion of the side rail.   The vehicle body skeleton structure according to any one of claims 1 to 3, wherein the reinforcing means reinforces the side rails on the outer side in the vehicle width direction of an occupant position assumed in the vehicle.

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