JP4798437B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure.

  A front side frame is a component of a vehicle frame, and generally includes a left front side frame and a right front side frame, and each front side frame extends rearward from the vicinity of a front bumper.

  For example, Patent Document 1 discloses a structure in which the rear end portion of the front side frame is bent outward in the vehicle width direction and joined to a hinge pillar (front pillar lower). The structure of the rear end portion of the front side frame serves to distribute the load or input transmitted from the front portion of the vehicle to the front side frame.

US Pat. No. 6,705,670 JP 2005-47422 A

  However, when the rear end portion of the front side frame is bent as described above, when a large input is applied to the front side frame from the front of the vehicle, such as during a frontal collision, the inner portion of the bent portion is crushed, There is a potential problem that the outer part tends to tear.

  The present invention has been invented in order to solve the above-described technical problem, and provides a vehicle body front structure that suppresses crushing of the inner side portion of the rear end bending portion of the front side frame and tearing of the outer side portion. For the purpose.

To achieve the above object, the vehicle body front structure of the present invention includes a hollow left and right front side frame extending rearward from the front end of a vehicle, and a left and right front hinge pillar to which the front side frame is joined, respectively. Each front side frame has a straight portion extending generally straight from the front end of the vehicle along the longitudinal axis of the vehicle, and extends outward from the straight portion in the vehicle width direction and joined to the front hinge pillar. Each of the front side frames has a closed cross section in a plane perpendicular to the longitudinal axis thereof, and is provided on an inner surface of the inner side of the bent portion in the vehicle width direction. An inner reinforcement having a radial plate portion extending inwardly from an inner surface of the inner portion in the width direction, and the front provided on the inner surface of the outer portion in the vehicle width direction of the bent portion And outer reinforcement that extends along the longitudinal direction of the Id frame, the left, and a beam member extending between the right hinge pillar in the vehicle width direction, bulges toward the beam member from said the bent part of each front side frame A gusset is provided, and the outer reinforcement extends forward and backward in the vehicle front-rear direction with respect to the inner reinforcement .
In the vehicle body front structure of the present invention having the above-described configuration, an inner reinforcement having a radial plate portion extending inwardly from the inner surface is provided on the inner surface of the bent portion in the vehicle width direction, and the vehicle width of the bent portion is also determined. Since the outer reinforcement that extends along the longitudinal direction of the front side frame is provided on the inner surface of the outer side in the direction, external force is applied to the front side frame from the front to the rear of the front side frame when the vehicle collides with another vehicle. Even when added, it is possible to suppress the inner side portion in the vehicle width direction of the bent portion of the front side frame from being crushed and to prevent the outer side portion in the vehicle width direction of the bent portion from being torn.
Moreover, according to this structure, the collapsing suppression effect with respect to the bending part of the front side frame by an inner reinforcement can be acquired over the range which an outer reinforcement extends.
Further, according to this configuration, when a large external force is applied to the front side frame from the front to the rear of the vehicle so that the gusset collides with the beam member, a large input applied to the front side frame is transmitted to the beam member and dispersed. By doing so, deformation of the front side frame can be suppressed.

  Furthermore, in the present invention, it is preferable that the outer reinforcement extends in a longitudinal direction of the vehicle so as to straddle the inner reinforcement and the gusset. According to this configuration, the force or load supported by the inner reinforcement or the outer reinforcement is transmitted and distributed to the vicinity of the gusset via the outer reinforcement, and the load is distributed when the gusset contacts the beam member. Performance can be improved.

Furthermore, in the present invention, each front side frame is composed of an outer half portion in the vehicle width direction and an inner half portion in the vehicle width direction, and the inner reinforcement is previously joined to the inner half portion in the vehicle width direction, The outer reinforcement is joined in advance to the vehicle width direction outer half, and the vehicle width direction inner half and the vehicle width direction outer half are joined so as to constitute the front side frame. Is preferred.
The front side frame, which has a considerable length, is composed of two parts, making it easier to manufacture the front side frame, and the inner and outer reinforcements located inside the front side frame when completed. Installation on the front side frame is easy.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body front part structure which suppresses the crushing of the inner side part of the rear-end bending part of a front side frame, and the tearing of an outer side part can be provided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  Referring to FIGS. 1 and 2, a part of a chassis 1 constituting a vehicle is shown. The chassis 1 has a floor panel 2 at the center in the vehicle front-rear direction, and a side sill 3 extending in the vehicle front-rear direction is provided on each side of the floor panel 2. The floor panel 2 is also provided with a front hinge pillar 4 extending upward from the front end of each side sill 3, and a front door (not shown) is hinged to each front hinge pillar 4.

  Apron members 5 are formed so as to extend forward from the front hinge pillars 4 in the vehicle front-rear direction, and suspension towers 6 are formed on the apron members 5. Front side frames 10A and 10B are arranged inside each apron member 5 in the vehicle width direction. Each front side frame 10A, 10B extends substantially along the apron member 5, and a front bumper beam, that is, a front cross member (not shown) is attached between the front ends of the front side frames 10A, 10B. A front bumper (not shown) or the like is attached to the front cross member.

  Each of the front side frames 10A and 10B includes a straight portion 10S that extends straight from the front cross member (not shown) along the longitudinal axis of the vehicle in the vehicle longitudinal direction, and an upper mount from the straight portion 10S. And a curved portion 10 </ b> C that extends outward in the vehicle width direction behind the vehicle 6 and is joined to the front hinge pillar 4. Each front side frame 10 </ b> A, 10 </ b> B is connected to a front end portion of a floor side member 11 that extends in the vehicle front-rear direction on the lower surface of the floor panel 2.

  Each front side frame 10A, 10B consists of a hollow sleeve-like member, and the cross section in the plane orthogonal to the longitudinal axis is a closed cross section. In the present embodiment, each of the front side frames 10 </ b> A and 10 </ b> B includes two parts divided in the vertical direction, that is, a vehicle width direction outer sleeve half 12 and a vehicle width direction inner sleeve half 13.

  Each of the sleeve halves 12 and 13 includes an upper flange portion and a lower flange portion (only a part of them are shown in FIG. 1) at the upper edge portion and the lower edge portion thereof. The front side frames 10 </ b> A and 10 </ b> B are formed by fixing the upper flange portion and the lower flange portion and the upper flange portion and the lower flange portion of the sleeve half 13 by welding or the like. The upper flange portion and the lower flange portion may be formed so as to extend over the entire length of the sleeve halves 12 and 13 in accordance with desired strength and rigidity required for the front side frames 10A and 10B. A plurality of sleeve halves 12 and 13 may be formed at intervals in the length direction. The front side frames 10A and 10B are composed of two half parts, a vehicle width direction outer sleeve half 12 and a vehicle width direction inner sleeve half 13, and are easily joined by welding or the like. Since 10A and 10B can be obtained, the front side frames 10A and 10B have an advantage that they are easy to manufacture as compared with the case where the front side frames 10A and 10B are formed from one integrated product.

Reference is now made to FIGS. FIG. 3 shows the front side frame 10 </ b> A in the vicinity of the curved portion 10 </ b> C along the line III-III in FIG. 1, that is, the front side frames 10 </ b> A and 10 </ b> B. FIG. 4 is a plan view of the vicinity of the curved portion 10C of the front side frame 10A.
As shown in FIGS. 3 and 4, the bending portion 10 </ b> C is bent outward in the vehicle width direction on the inner surface 13 a of the vehicle width direction inner sleeve half 13 constituting the bending portion 10 </ b> C of each front side frame 10 </ b> A, 10 </ b> B. Thus, an inner reinforcement 20 is provided to prevent the bending portion 10C, particularly the inner sleeve half 13 in the vehicle width direction, from being crushed when an external force is applied to the front side frames 10A and 10B. As can be seen from FIG. 5, the inner reinforcement 20 extends in the longitudinal direction of the inner width half sleeve 13 attached to the inner surface 13a of the inner width half sleeve 13 (for example, by welding). It has a longitudinal plate portion 21 and a radial plate portion 22 extending inward of the front side frames 10A and 10B from the rear edge portion of the longitudinal plate portion 21, and as a whole, the nodes of the front side frames 10A and 10B. Forming a reinforcing member.

  On the other hand, the inner surface 12a of the vehicle width direction outer sleeve half 12 constituting the bending portion 10C is bent when an external force is applied to the front side frames 10A and 10B so that the bending portion 10C is bent outward in the vehicle width direction. An outer reinforcement 30 is provided to prevent the portion 10 </ b> C, particularly the outer half portion 12 in the vehicle width direction, from tearing. The outer reinforcement 30 is composed of a planar reinforcing member attached to the inner surface 12a of the outer sleeve half 12 in the vehicle width direction (for example, by welding). As shown in FIG. Dimensionally shaped and arranged to extend forward and backward in the direction.

  As can be clearly seen from FIG. 6, the outer reinforcement 30 has a complicated shape that matches the shape of the inner surface 12 a of the outer sleeve half 12 in the vehicle width direction in this embodiment, but has the required rigidity and strength. It can take any shape necessary to obtain.

  As described above, since the front side frames 10A and 10B are constituted by two half parts, the outer sleeve half part 12 in the vehicle width direction and the inner sleeve half part 13 in the car width direction, Prior to joining, the inner reinforcement 20 is provided on the inner surface 13a of the inner half 13 of the vehicle width direction, and the outer reinforcement 30 is provided on the inner surface 12a of the outer half 12 of the vehicle width direction. Easy.

  The left and right hinge pillars 4 and 4 are provided with in-strument panel members (not shown) extending in the vehicle width direction. The instrument panel members are used for air conditioners for front seats, various electronic devices, and the like. Used to support an instrument panel (not shown). An instrument panel member of this type is disclosed in, for example, Patent Document 2.

  In the present embodiment, separately from the above-described instrument panel member (not shown), a cross car beam 40 extending in the vehicle width direction is provided on the left and right hinge pillars 4 and 4 below the instrument panel member (not shown), as shown in FIGS. It is attached via bolts and nuts.

  On the outer surface 13b of the vehicle width direction inner sleeve half 13 in the curved portion 10C of each front side frame 10A, 10B, a reinforcing abutting member, that is, a gusset 50 (for example, by welding) is opposed to the cross car beam 40. It is attached. The gusset 50 has a generally triangular top wall 51, bottom wall 52, and a peripheral wall 53 extending therebetween. The peripheral wall 53 includes an abutting surface 54 having a surface extending substantially parallel to the longitudinal axis of the cross car beam 40, a vehicle width direction inner surface 55 extending forward from the abutting surface 54 in the vehicle front-rear direction, and an abutting surface. 54 and an inner surface 55, and has an attachment surface 56 attached to the outer surface 13 b of the inner half 13 of the vehicle width direction sleeve. As shown in FIG. 3, the shape of the mounting surface 56 matches the shape of the outer surface 13 b of the inner half portion 13 in the vehicle width direction. The outer reinforcement 30 is dimensioned and arranged so as to extend across the inner reinforcement 20 and the gusset 50 in the longitudinal direction of the vehicle.

  In the chassis 1 having the structure described above, an external force is applied to the front side frames 10A and 10B from the front of the vehicle to the rear, such as when a vehicle equipped with the chassis 1 collides with another vehicle, and the external force When the curved portions 10C of the frames 10A and 10B are bent outward in the vehicle width direction, the inner sleeve half 13 in the vehicle width direction is crushed, and the outer sleeve half 12 in the vehicle width direction is ruptured, the vehicle width direction The inner reinforcement 20 provided in the inner sleeve half 13, particularly the radial plate portion 22, prevents the inner sleeve half 13 in the vehicle width direction from being crushed, and the outer rain provided in the outer sleeve half 12 in the vehicle width direction. The reinforcement 30 suppresses the tearing of the outer sleeve half 12 in the vehicle width direction. In particular, in this embodiment, since the outer reinforcement 30 extends forward and rearward in the vehicle front-rear direction relative to the inner reinforcement 20, the inner reinforcement 20 can prevent the front side frames 10A and 10B from being crushed against the bent portion 10C. Can be obtained over a range in which the outer reinforcement 30 extends.

  When a larger external force is applied to the front side frames 10A and 10B from the front to the rear of the vehicle, the bending portion 10C is moved rearward in the vehicle front-rear direction. The gusset 50 provided at the rear in the direction, particularly the abutting surface 54, abuts the cross car beam 40 provided at the rear in the vehicle front-rear direction. The force transmitted to the cross car beam 40 via the front side frames 10A and 10B and the gusset 50 is distributed to the side of the cross car beam 40 opposite to the side on which the gusset 50 abuts. Concentration of stress on the combined crosscar beam 40 is prevented. In this connection, since the outer reinforcement 30 extends so as to straddle the inner reinforcement 20 and the gusset 50 in the longitudinal direction of the vehicle, the force or load supported by the inner reinforcement 20 or the outer reinforcement 30 is the same. Can be transmitted and dispersed in the vicinity of the gusset 50 via the outer reinforcement 30, and the load dispersibility when the gusset 50 comes into contact with the cross car beam 40 can be improved.

The present invention is not limited to the above-described embodiments, and various modifications as described below are possible.
In the above embodiment, the radial plate portion 22 is joined to the longitudinal plate portion 21, but it may be joined directly to the inner surface 13 a of the vehicle width direction inner sleeve half 13 or may be integrally formed with the inner surface 13 a. . Similarly, the longitudinal plate portion 21 may be formed integrally with the inner surface 13a, and the outer reinforcement 30 may be formed integrally with the inner surface 12a of the vehicle width direction outer sleeve half portion 12.

  Moreover, in the said embodiment, although the gusset 50 was comprised by the member different from front side frame 10A, 10B, you may integrally form the gusset 50 with front side frame 10A, 10B.

  Furthermore, although the gusset 50 has the mounting surface 56 in the above embodiment, the mounting surface 56 is not always necessary. In this case, by attaching the top wall 51, the bottom wall 52, the abutting surface 54, and the inner surface 55 to the outer surface 13 b of the vehicle width direction inner sleeve half 13, the gusset 50 is attached to the vehicle width direction inner sleeve half 13. It is attached to the outer surface 13b.

It is a schematic front perspective view which shows the vehicle body front part structure by embodiment of this invention. FIG. 2 is a schematic rear perspective view showing the vehicle body front part structure of FIG. 1. FIG. 3 is a partially enlarged schematic cross-sectional view showing a part of the vehicle body front structure in cross section in a state cut along line III-III in FIG. 1. It is a partial schematic plan view of the vicinity of the curved portion of the front side frame. FIG. 2 is a schematic perspective view of an inner reinforcement disposed inside a front side frame of the vehicle body front structure in FIG. 1. FIG. 2 is a schematic perspective view of an outer reinforcement disposed inside a front side frame of the vehicle body front structure in FIG. 1.

Explanation of symbols

4 Front hinge pillar 10A, 10B Front side frame 10S Straight line part 10C Curved part (bending part)
20 Inner reinforcement 22 Radial direction plate part 30 Outer reinforcement

Claims (3)

A hollow left and right front side frame extending rearward from the front end portion of the vehicle, and left and right front hinge pillars to which the front side frames are respectively joined, each front side frame extending from the front end portion of the vehicle A straight portion that extends generally straight along the longitudinal axis of the vehicle, and a bent portion that extends outward in the vehicle width direction from the straight portion and is joined to the front hinge pillar. A cross section in a plane perpendicular to the longitudinal axis is a closed cross section, a vehicle body front structure,
An inner reinforcement provided on the inner surface of the bent portion on the inner side in the vehicle width direction and including a radial plate portion extending inward from the inner surface of the inner portion in the vehicle width direction;
An outer reinforcement provided along the longitudinal direction of the front side frame, provided on the inner surface of the outer side in the vehicle width direction of the bent portion ;
A beam member extending in the vehicle width direction between the left and right hinge pillars;
A gusset that bulges from the bent portion of each front side frame toward the beam member;
The outer reinforcement extends forward and rearward in the vehicle front-rear direction than the inner reinforcement.
Body front structure. The outer reinforcement, in the front-rear direction of the vehicle, so as to extend over the said inner reinforcement reinforcement and the gusset extending, front body structure of claim 1, wherein. Each of the front side frames is composed of an outer half in the vehicle width direction and an inner half in the vehicle width direction,
The inner reinforcement is previously joined to the inner half in the vehicle width direction,
The outer reinforcement is joined in advance to the outer half in the vehicle width direction,
The vehicle width direction inner half and the vehicle width direction outer half are joined to form the front side frame,
The vehicle body front part structure according to claim 1 or 2 .

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