JP4757240B2 - Body front structure - Google Patents

Description

  The present invention relates to a front structure of a vehicle body having a front bulkhead.

2. Description of the Related Art Conventionally, there is a front structure of a vehicle body of a passenger car type vehicle in which a front bulkhead formed in a rectangular frame shape is provided with upper and lower horizontal members and left and right vertical members to support a radiator. In such a front structure of the vehicle body, there has been a structure in which the radiator can be retracted at the time of a light collision on the front side of the vehicle body to prevent damage to the radiator (for example, see Patent Document 1).
JP 2004-322837 A

  However, in the thing of the said patent document 1, since the right and left front side frames are connected only via bumper reinforcement, it cannot be said that the rigidity of the front end of the vehicle body is high, and is due to the unevenness of the road surface during traveling. Due to vibrations or the force of tilting the vehicle body during turning, the left and right front side frames may be twisted (swinged) or vibrated, which may deteriorate steering stability.

In order to solve such problems and increase the rigidity of the front end portion of the vehicle body and to prevent the radiator from being damaged during a light collision, in the present invention, it is disposed at the front portion of the vehicle body. In front of a vehicle body having a front bulkhead (31) formed in a rectangular frame shape with upper and lower horizontal members (34, 35) and left and right vertical members (32, 33) to support the radiator (38) The front bulkhead (31) has a connecting means for connecting the longitudinal central portion of the longitudinal member (32, 33) to the front end of the front side frame (11, 12) of the vehicle body. Are coupled to each other and supported by the front side frames (11, 12), and the coupling means includes a front plate member (36) and a rear plate member (37) disposed in the longitudinal direction of the vehicle body. , The front-side plate member (36) is coupled to the connection between longitudinal members (32, 33) of the vehicle body front-side end face and the front bulkhead (31) of said front side frames (11, 12) , the rear-side plate member (37), the so than the front-side plate member (36) when a load is applied from the front of the vehicle body deforms by a light load to the front bulkhead (31), the front plate Formed in a substantially long plate shape that extends in the vertical direction of the vehicle body by a thin plate material thinner than the shaped member, and the width direction thereof is provided along the vehicle lateral direction inner side surface of the front side frame toward the vehicle longitudinal direction. A longitudinal central portion is coupled to an inner surface of a front side portion of the front side frame, and both longitudinal end portions are above and below the longitudinal member of the front bulkhead. It was assumed to be coupled to the intermediate portion.

  In particular, the front plate-like member (36) is coupled so as to connect the vehicle body front side end surface of the front side frame (11, 12) and the longitudinal member (32, 33) of the front bulkhead (31). The rear plate member (37) is preferably formed in a substantially long plate shape made of a thin plate material thinner than the front plate member (36), and the width direction of the rear plate member (37) is preferably directed toward the vehicle body longitudinal direction.

  Thus, according to the present invention, the rear plate member is formed so as to be deformed with a lighter load than the front plate member with respect to the load from the front side of the vehicle body of the bulkhead. The front plate-like member can retain its shape against deformation, and the rigidity to the radiator can be ensured, so that the radiator can be prevented from being deformed at the time of a light collision with a light load.

  Furthermore, since the front side plate-like member is connected so as to connect the front side end surface of the front side frame and the longitudinal member of the bulkhead, the left and right front side frames are connected via the bulkhead. The rigidity of the front end portion of the vehicle body becomes high, and it is possible to suppress the occurrence of vibrations caused by unevenness on the road surface during traveling and the torsional (swinging) and vibrations caused by the force of tilting the vehicle body when turning, thereby improving steering stability.

  In particular, the rear plate member is formed in a substantially long plate shape with a thin plate material and the width direction thereof is provided in the longitudinal direction of the vehicle body. Since the plate-shaped width direction is directed in the longitudinal direction of the vehicle body, it can be deformed to tilt backward while maintaining the plate-shaped shape. The radiator can be easily tilted backwards during a light collision.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an entire passenger car-type automobile to which the present invention is applied as viewed obliquely from the front, and FIG. 2 shows a front structure of a vehicle body to which the present invention is applied as viewed from the arrow II line of FIG. It is a principal part expansion perspective view shown.

  As shown in FIG. 1, the vehicle body structure of the present embodiment has front and rear front side frames 11, 12 extending in the longitudinal direction of the vehicle body and front ends of the front side frames 11, 12 as skeleton strength members of the front vehicle body. The front bumper beam 13 connects the (vehicle body front side) to each other, and the engine room 14 is defined inside these. In addition, left and right extensions 30 extending forward of the vehicle body are coupled to the front side of the front side frames 11 and 12, respectively, and left and right ends of the front bumper beam 13 are coupled to the vehicle body front portion of each extension 30. Yes. The left and right front side frames 11 and 12 are fixedly joined at their rear ends to the front ends of the left and right side sill members 17 and 18 by outriggers 15 and 16, respectively.

  A rectangular front bulkhead 31 is disposed between the front end portions of the left and right front side frames 11 and 12 as a whole. As shown in FIG. 2, the front bulkhead 31 includes left and right longitudinal members 32 and 33 extending in the vertical direction of the vehicle body along the inner side surfaces at the front end portions of the left and right front side frames 11 and 12. The upper and lower lateral members 34 and 35 are provided in a bridging manner between the upper and lower ends of the left and right longitudinal members 32 and 33, respectively. Is formed in a rectangular shape. Moreover, the corresponding edge part of each member 32-35 is joined by welding at each rectangular corner | angular part.

  Each skeleton strength member may be a rectangular cross section formed of, for example, a U-shaped cross-section member and a plate-like member, and this shape is known as a skeleton strength member of a vehicle body, and detailed description thereof is omitted. .

  FIG. 3 shows a side view of the front right corner of the vehicle body as viewed from the outside. The left and right sides may have the same structure, and the right front corner of the vehicle body will be described below unless otherwise specified. Two members, a front plate member 36 and a rear plate member 37 arranged in the longitudinal direction of the vehicle body, are used as a connecting means for connecting the vehicle body front end portion of the front side frame 12 and the longitudinal member 33 of the front bulkhead 31. Is provided.

  As shown in FIGS. 4 and 5, the front plate member 36 is joined to the front end surface of the front side frame 12 by welding with a surface 36 a orthogonal to the longitudinal axis on the front side of the front side frame 12. It is made of thick plate material. As shown in the figure, appropriate portions such as edges are bent by pressing so as to increase the rigidity of the plate-like body. And each ear | edge part 36b is formed in the vehicle body up-down direction edge part of the vehicle inner side edge in the attachment state of the front side plate-shaped member 36, and the longitudinal direction member 33 of the front bulkhead 12 is shown in FIG. Upper and lower ear portions 36b are joined to the middle portion in the vertical direction by welding.

  As shown in FIGS. 4 and 5, the rear plate member 37 is a long plate extending in the vehicle body vertical direction along the vehicle body width direction inner side surface of the vehicle body front side portion of the front side frame 12. It is formed of a thin plate material that is thinner than the front plate member 36. Even in the rear side plate-like member 37, an appropriate portion such as an edge is bent by press working so as to increase the rigidity of the plate-like body. In the rear plate member 37, a widened portion 37a that is wider than both ends is formed at the center in the longitudinal direction, and a part of the widened portion 37a is part of the front side frame 12 as shown in FIG. It is joined to the inner surface of the front part of the vehicle body by welding. Both longitudinal end portions 37b of the rear plate member 37 are joined to the vertical middle portion of the longitudinal member 33 of the front bulkhead 12 by welding.

  Further, as shown in FIG. 3, a radiator 38 is attached to the front bulkhead 31 so as to be positioned in front of the vehicle body. The radiator 38 is supported by the front bulkhead 31 via brackets 41 and 42 provided between the upper and lower end surface portions and the upper and lower lateral members 34 and 35, respectively. In addition, a tongue-like lower plate member 43 extending to the front side of the vehicle body is coupled to the lower lateral member 35.

  In the front structure of the vehicle body configured as described above, when a load F1 is applied to the lower member 43 integral with the front bulkhead 31 as shown in FIG. The lower side portion of the rear side plate member 37 having a lower rigidity than the side plate member 36 is deformed so as to bend toward the rear side of the vehicle body as indicated by a two-dot chain line. Since the rear plate member 37 is deformed as described above before the front plate member 36, the front bulkhead 31 can be moved to the rear side of the vehicle body without being deformed. Damage to the front side frame 12 can be prevented.

  Further, as shown in FIG. 9, when a load is applied to the upper part of the front bulkhead 31, the upper part of the rear plate member 37 with respect to the front side frame 12 is rearward of the vehicle body as indicated by a two-dot chain line. Deforms to bend. Also in this case, since the rear plate member 37 is deformed as described above before the front plate member 36, the front bulkhead 31 is not deformed, and the radiator 38 and the radiator 38 are inclined rearward to the rear of the vehicle body. Thus, collision energy can be absorbed.

  Thus, the damage to the collision partner can be reduced by the deformation of the rear side plate-shaped member 37 at the time of a light collision. This can reduce damage to the collision partner even at the time of a collision with a pedestrian, for example, and contributes to an improvement in pedestrian protection performance as a vehicle body.

  Furthermore, according to the present invention, the left and right front side frames 12 and 13 are connected to each front end via the front bumper beam 13 and also connected to each front end of the vehicle body via the front bulkhead 31. Thus, a double connection structure is formed between the left and right, and the rigidity of the front end portion of the vehicle body can be increased. As a result, it is possible to suppress vibrations caused by road surface unevenness during traveling and torsion (oscillation) and vibrations due to the force of tilting the vehicle body during turning, and to improve steering stability.

It is the perspective view which looked at the whole passenger car type car to which the invention was applied from diagonally forward. FIG. 2 is a perspective view of the front bulkhead viewed from the arrow II line in FIG. 1. It is the side view seen from the arrow III line of FIG. It is a perspective view which shows the front side and rear side plate-shaped member based on this invention. It is a figure which shows the front side and rear side plate-shaped member seen from the arrow V line of FIG. It is sectional drawing seen along the arrow VI-VI line of FIG. It is sectional drawing seen along the arrow VII-VII line of FIG. It is explanatory drawing corresponding to FIG. 3 at the time of the light collision to a lower part. It is explanatory drawing corresponding to FIG. 3 at the time of the light collision to upper part.

Explanation of symbols

11.12 Front side frame 31 Front bulkhead 32, 33 Longitudinal members 34, 35 Horizontal members 36 Front plate member 37 Rear plate member 38 Radiator

Claims (1)

A front structure of a vehicle body having a front bulkhead formed in a rectangular frame shape with upper and lower horizontal members and left and right vertical members to support a radiator disposed at the front of the vehicle body,
The front bulkhead is supported by the front side frame by coupling a longitudinal center portion of the longitudinal member to a front end of the front side frame of the vehicle body via a coupling means.
The coupling means consists of a front plate member and a rear plate member arranged in the longitudinal direction of the vehicle body,
The front plate-like member is coupled so as to connect the vehicle body front side end surface of the front side frame and the longitudinal member of the front bulkhead,
The rear plate member is formed by a thin plate material thinner than the front plate member so as to be deformed with a lighter load than the front plate member when a load from the front side of the vehicle body is applied to the front bulkhead. Is formed in a substantially long plate shape extending in the direction of the vehicle body along the vehicle body width direction inner side surface of the front side frame, and the center portion in the longitudinal direction is the front side frame. A front structure of a vehicle body which is coupled to an inner side surface of a front portion of the vehicle body and has both longitudinal ends coupled to an intermediate portion in the vertical direction of the longitudinal member of the front bulkhead .

Images