JP5723562B2 - Auto body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure that appropriately absorbs a shock during a light collision of a vehicle and minimizes damage.

  Conventionally, various proposals have been made regarding the front structure of a vehicle body. For example, in Japanese Patent Laid-Open No. 2002-193144 (hereinafter referred to as Patent Document 1), a radiator core upper rail is slanted through a center portion extending substantially straight in the vehicle width direction and a corner portion curved from the center portion. The upper and lower sides of the radiator core side member, which is composed of a side portion extending rearward, is connected to the front end portion of the upper side frame, and is joined across the center portion and the first cross member. Disclosed is a front structure of a vehicle body in which a stay member is connected obliquely across a middle part in the vertical direction of a directional skeleton part and the vicinity of a curved corner part of a side part, and a triangular truss part is formed at the curved corner part. Has been.

JP 2002-193144 A

  By the way, in the conventional vehicle body front structure as disclosed in the above-mentioned Patent Document 1, the front end side of the front side frame extending forward from the toe board side along the left and right lower edges of the engine room. The crush box and radiator panel provided in the are connected with bolts so that they can be easily replaced in the event of a light collision. On the other hand, since the support member of the front fender is joined to the front side frame by welding, it has a structure that has some strength and is not damaged. For this reason, there is a problem that the mass is increased, and a part or the like that moves backward in the event of a light collision and gives an impact to the support member cannot be disposed on the front side of the support member of the front fender.

  The present invention has been made in view of the above circumstances, and while effectively utilizing the space in the narrow engine chamber, in particular, without adding reinforcement or the like, the impact due to a light collision is appropriately absorbed to damage the main skeleton. An object of the present invention is to provide a vehicle body front structure that can be reliably prevented.

The present invention includes an upper side frame that extends from the front pillar along the left and right upper edges of the engine room toward the front of the vehicle body, and a front that extends from the toe board side toward the front of the vehicle body along the left and right lower edges of the engine room. A side frame, a connecting member that is detachably connected to a front end portion of the upper side frame, extends obliquely downward and forward from the front end portion of the upper side frame, and is detachably connected to the front side frame; and a radiator panel The rear end of the connecting member is connected to the front side of the vehicle body from the connecting portion between the connecting member and the upper side frame of the connecting member. an upper side radiator panels collision load in the direction is transmitted away, communication between the connecting member and the front side frame Is disposed in front of the section, at the time of frontal collision, is characterized in that a vehicle component for transmitting the collision load to the connecting member in a direction in which the said connecting member and the upper side radiator panels are separated.

  According to the vehicle body front structure according to the present invention, while effectively utilizing the space in the narrow engine chamber, the main skeleton is damaged by appropriately absorbing the impact caused by the light collision without adding reinforcement or the like. It becomes possible to prevent reliably.

It is a perspective view of the front part structure of the vehicle body concerning one embodiment of the present invention. It is a side view of the front part structure of the vehicle body concerning one embodiment of the present invention. It is explanatory drawing regarding the deformation | transformation mode in the case of the light collision which concerns on one Embodiment of this invention. It is a deformation | transformation anticipation figure in the case of the light collision which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show the front structure of the vehicle body. In these drawings, reference numeral 10 extends from the middle part of the front pillar (not shown) toward the front of the vehicle body along the left and right upper edges of the engine room RE. A front side frame 20 extends below the upper side frame 10 from the toe board side (not shown) along the left and right lower edges of the engine room RE toward the front of the vehicle body.

  A front suspension strut tower 30 is fixed between the upper side frame 10 and the front side frame 20.

  A bumper beam 50 that is long in the vehicle width direction is installed on a front end portion 21 of the front side frame 20 via a crash box 40 that is bolted.

  At the front end portion of the engine room RE behind the bumper beam 50, a radiator panel 60 is disposed with a side portion thereof coupled to the front side frame 20 by bolts.

  On the side surface of the front end portion 21 of the front side frame 20, a fender bracket 70 that extends substantially horizontally toward the outside in the vehicle width direction and supports a front fender (not shown) from the back surface is fixed by welding or the like.

  The front end portion 11 of the upper side frame 10 is detachably attached to the front end portion 11 of the upper side frame 10 from the upper side frame 10 by bolting or the like, and toward the outer end portion 71 of the fender bracket 70 in the vehicle width direction. A connecting member 80 is provided that extends obliquely downward and forward from the outer end 71 of the fender bracket 70 in the vehicle width direction and is detachably connected by bolting or the like.

  A front end portion 91 of an upper side radiator panel 90 extending toward the rear side is connected to an upper portion of the radiator panel 60, and a rear end portion 92 of the upper side radiator panel 90 is connected to the connecting member 80 described above. And the upper side frame 10 are connected to the connecting member 80 at a connecting point P2 located in front of the vehicle body from the connecting point P1.

  In addition, an in-vehicle component 100 such as a washer tank fixed to the fender bracket 70 by the bracket is disposed in a space in front of the connecting portion between the connecting member 80 and the fender bracket 70 described above.

  The operation of the front structure of the vehicle body configured as described above will be described with reference to FIGS. In the figure, the connecting point of the connecting member 80 with the upper side frame 10 is P1, the connecting point with the upper side radiator panel 90 is P2, and the fixing point of the lamp (not shown) on the upper side radiator panel 90 is P3. The fixing point of the in-vehicle component 100 such as a washer tank and the fender at the outer end 71 in the vehicle width direction of the fender bracket 70 is P4.

  When a light collision occurs on the front of the vehicle, for example, a load input A indicated by an arrow A in FIG. 2 is generated on the radiator panel 60 and the lamp, and an arrow B is indicated on the bumper beam 50 in FIG. Load input B is generated.

  The load input A is transmitted to the upper side radiator panel 90 through the radiator panel 60, and further from the fixed point P3 to the upper side radiator panel 90 through a lamp or the like. The input load A ′ to the rear is transmitted to the rear of the vehicle body. Further, as shown in FIG. 4, the load input B transmits the load to the in-vehicle component 100 as the bumper beam 50 moves backward, and the in-vehicle component 100 at the vehicle width direction outer end portion 71 of the fender bracket 70 and the fender bracket 70. Is transmitted to the connecting member 80 via a fixed point P4, and the connecting member 80 is transmitted to the rear of the vehicle body as an input load in the horizontal direction indicated by an arrow B ′.

  These input loads A ′ and B ′ are the deformation modes as shown in FIG. 3, respectively, and the connection point P1 of the connection member 80 to the upper side frame 10 and the connection point of the connection member 80 to the upper side radiator panel 90. It will act on P2. (1) is a region from the front end 91 of the upper side radiator panel 90 to the connection point P2 with the connection member 80, (2) is a region from the front end of the connection member 80, that is, the fixed point P4 to the connection point P2, (3) shows a region from the connection point P2 of the connection member 80 to the connection point P1. As shown in FIG. 3B, first, when attention is focused only on the input load A ', a moment is generated clockwise at the connection point P2. That is, (1) and (3) try to rotate clockwise. Next, as shown in FIG. 3C, when attention is focused only on the input load B ', a moment is generated counterclockwise at the connection point P1 due to the vertical component of the connection member 80 of the input load B'. That is, (2) and (3) try to rotate counterclockwise. Here, when the moment due to the input load A ′ and the moment due to the input load B ′ are combined, as shown in FIG. 3D, in the region (3), they try to rotate in opposite directions, so they cancel each other out. It will be. That is, as shown in FIG. 3 (e), in the region (3), they cancel each other out and the moment becomes small. That is, since the moment of the connection point P2 is the maximum, the connection member 80 can be stably deformed in front of the vehicle body at the connection point P2, and an impact caused by a light collision is caused by the connection member 80 and the upper side radiator panel 90. It is possible to prevent the main skeleton of the upper side frame 10 and the front side frame 20 from being damaged.

  Therefore, it is only necessary to reduce the transmission of the load to the connection point P1 with the upper side frame 10 and appropriately suppress the deformation on the main skeleton side in consideration of only the load in the horizontal direction at the connection point P1. In addition, since the members are generally weak against moments and easy to give strength to axial forces, they become ideal load input forms, and there is no need for additional reinforcing members, and mass increases due to reinforcement of the joints. And no increase in cost.

  As described above, according to the embodiment of the present invention, the front side frame 10 is detachably connected to the front end portion 11 of the upper side frame 10 and extends obliquely downward and forward from the front end portion 11 of the upper side frame 10. 20 is detachably connected to the connecting member 80, and the rear end 92 of the upper side radiator panel 90 is connected to the front side of the vehicle body from the connecting portion P1 between the connecting member 80 and the upper side frame 10, and the connecting member 80 and the front side are connected. Since the in-vehicle component 100 is disposed in front of the vehicle body from the connecting portion with the frame 20, in particular, without adding reinforcement or the like, the impact due to the light collision is appropriately absorbed to reliably prevent damage to the main skeleton. It is possible. Further, it is possible to dispose the in-vehicle component 100 such as a washer tank in front of the vehicle body of the fender bracket 70, and it is possible to effectively utilize the space in the narrow engine room RE even in a vehicle with a short front overhang.

  Further, as described in the embodiment of the present invention, the fender bracket 70, the connecting member 80, and the upper side frame 10 that extend outward in the vehicle width direction are connected to the side portion of the front side frame 20. As a result, the rigidity of the vehicle body is increased, and the relative displacement between the suspension (the strut tower 30) and the front side frame 20 due to the suspension input can be suppressed, and the fluctuation of the suspension geometry during driving can be suppressed to improve the handling stability. It is possible to plan.

DESCRIPTION OF SYMBOLS 10 Upper side frame 11 Front end part 20 Front side frame 21 Front end part 30 Strut tower 40 Crash box 50 Bumper beam 60 Radiator panel 70 Fender bracket 71 Outer end part 80 Connecting member 90 Upper side radiator panel 91 Front end part 92 Rear end part 100 In-vehicle parts

Claims (2)

An upper side frame extending from the front pillar toward the front of the vehicle body along the left and right upper edges of the engine room;
A front side frame extending from the toe board side toward the front of the vehicle body along the left and right lower edges of the engine room;
A connecting member that is detachably connected to the front end portion of the upper side frame, extends obliquely downward and forward from the front end portion of the upper side frame, and is detachably connected to the front side frame;
Extending from the upper side of the radiator panel toward the rear of the vehicle body, the rear end portion is connected to the front side of the vehicle body from the connection portion between the connection member of the connection member and the upper side frame, and the connection is performed in the event of a forward collision. An upper side radiator panel to which a collision load is transmitted in a direction away from the member ;
An on- vehicle vehicle that is disposed in front of a connecting portion between the connecting member and the front side frame and transmits a collision load to the connecting member in a direction in which the connecting member and the upper side radiator panel are separated in the case of a front collision. Parts,
An automobile body front structure characterized by comprising:   2. A front body of an automobile according to claim 1, wherein a bracket extending outward in the vehicle width direction is provided on a side portion of the front side frame, and a front end of the connecting member is detachably connected to the bracket. Part structure.

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