JP2012224216A - Vehicle body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a collision countermeasure member extended in a longitudinal vehicle direction at a position different from a side member to exhibit a function as the collision countermeasure measure, by preventing the dropping of the impact countermeasure member.SOLUTION: The vehicle body front structure includes: a pair of side members (3) extended in the longitudinal vehicle direction; a pair of lamp support braces (5) which are fixed on respective front edge parts and are extended in the vertical direction of the vehicle; lower cross members (7) which are extended in the vehicle width direction and are fixed on lower end parts of both of the lamp support braces (5); and a pair of load paths (11) which have the front edge parts fixed on the edge parts in the vehicle width direction of the lower cross members (7) and are extended in the vehicle longitudinal direction, wherein a front surface part facing the front edge parts of the load paths (11) and a support surface part supporting the lower surface of the front edge parts of the load paths (11) are disposed on the lower cross members (7), and the load paths (11) are fixed via the support surface part by a fastening member.

Description

  The present invention relates to a vehicle body front part structure, and more particularly to a vehicle body front part structure that minimizes deformation of a passenger compartment at the time of a vehicle frontal collision.

  In a front part of a vehicle body such as an automobile, an engine room for mounting vehicle parts such as an engine is provided inside. The engine room is disposed at the front end of the vehicle and is connected to a bumper member extending in the vehicle width direction, connected to both ends of the bumper member in the vehicle width direction, and a pair of side members extending in the front-rear direction and a rear end of the side member It is defined by the installed dash panel. In general, the passenger compartment where the driver is located and the engine compartment are separated by the dash panel described above.

  In the event of a frontal collision of the vehicle, the deformation of the passenger compartment can be minimized by absorbing the collision energy by, for example, deforming structural members (for example, bumper members and side members) arranged at the front of the vehicle body. It has been broken. For example, in order to effectively absorb the collision energy at the time of a vehicle frontal collision, a side member structure that suppresses excessive deformation of the side member has been proposed (see, for example, Patent Document 1). According to this side member structure, excessive deformation of the side member can be suppressed, and a situation in which the passenger compartment is deformed can be effectively prevented.

Japanese Patent Laid-Open No. 2002-53076, FIG.

  By the way, as a structural member that absorbs collision energy at the time of a vehicle frontal collision, a vehicle including a pair of anti-collision members extending in the front-rear direction of the vehicle is known in addition to the side members. This collision countermeasure member is also called a load path. In general, the road path is connected to the front end of the side member and is connected to a pair of ramp support braces extending in the vertical direction and a suspension frame disposed in the lower portion of the engine room and extending in the vehicle width direction. Is done.

  The load transmitted to the side member via the bumper member at the time of the front collision of the vehicle is transmitted to the load path via the lamp support brace. The load transmitted to the load path is transmitted to the suspension frame from the vicinity of the rear end portion of the load path. When the side member and the load path are deformed during such a load transmission process, the collision energy is absorbed. However, in general, the load path is fastened with a fastening member to the lower surface portion of the lamp support brace in the vicinity of the front end portion thereof. For this reason, when the fastening member is broken due to some factor, a situation occurs in which the load path is dropped, and the function as a collision countermeasure member cannot be achieved.

  The present invention has been made in view of such a point, and a vehicle body capable of preventing a collision countermeasure member that extends in the front-rear direction of the vehicle at a position different from that of a side member from being removed and exerting a function as a collision countermeasure member. The object is to provide a front structure.

  The vehicle body front structure according to the present invention includes a pair of side members extending in the front-rear direction of the vehicle at positions separated by a certain distance, and a pair of side members fixed to the front end portions of the side members and extending in the vertical direction of the vehicle. A front skeleton structure member, a cross member extending in the vehicle width direction of the vehicle and fixed to both lower ends of the front skeleton structure member, and a front end portion fixed to an end portion of the cross member in the vehicle width direction A pair of anti-collision members extending in the front-rear direction of the vehicle, and supporting the front surface of the cross member facing the front end of the anti-collision member and the lower surface of the front end of the anti-collision member A surface portion is provided, and the collision countermeasure member is fixed by a fastening member through the support surface portion.

  According to this configuration, the cross member is provided with the front surface portion that opposes the front end portion of the collision prevention member and the support surface portion that supports the lower surface of the front end portion of the collision prevention member, and the collision prevention member is provided by the fastening member via the support surface portion. It is fixed. For this reason, even when the fastening member is broken, the anti-collision member is supported by the support surface portion of the cross member. On the other hand, during a vehicle front collision, a load is transmitted from the front surface of the cross member to the collision countermeasure member. Thereby, since the collision countermeasure member can be deformed according to the transmitted load, it is possible to absorb the collision energy at the time of the vehicle front collision. As a result, it is possible to prevent the collision prevention member extending in the vehicle front-rear direction at a position different from that of the side member from falling off and to exhibit the function as the collision prevention member.

  In the vehicle body front structure, the lower surface portion of the front skeleton structure member is opposed to the upper surface portion of the collision countermeasure member, and the collision countermeasure member is interposed between the lower surface portion of the front skeleton structure member and the support surface portion. It is preferable to fix with the said fastening member in the clamped state. In this case, the collision countermeasure member is fixed by the fastening member while being sandwiched between the lower surface portion of the front skeleton structure member and the support surface portion of the cross member. For this reason, at the time of a vehicle front portion collision, a load is transmitted not only from the front surface portion of the cross member but also to the collision countermeasure member through the front skeleton structure member. Thereby, since the load generated at the time of the vehicle frontal collision can be accurately transmitted to the collision countermeasure member, the function as the collision countermeasure member can be sufficiently exhibited.

  Further, in the vehicle body front part structure, a pair of wall surface portions that extend rearward from the front surface portion of the cross member and face each other are provided, and the space surrounded by the pair of wall surface portions and the front surface portion of the cross member is It is preferable to arrange the front end portion of the collision countermeasure member. In this case, the front end portion of the collision countermeasure member is disposed in a space surrounded by the front surface portion of the cross member and the pair of wall surface portions. For this reason, even when the fastening member is broken, the displacement of the collision countermeasure member in the vehicle width direction can be restricted, so that the load generated at the time of the vehicle front collision can be reliably transmitted to the collision countermeasure member. As a result, the function as a collision countermeasure member can be exhibited reliably.

  According to the present invention, it is possible to prevent the collision countermeasure member that extends in the vehicle front-rear direction at a position different from that of the side member from falling out and to exhibit the function as the collision countermeasure member.

It is a perspective view which shows the vehicle body front part structure which concerns on this Embodiment from the upper side. It is a perspective view which shows the vehicle body front part structure which concerns on this Embodiment from the downward side. It is explanatory drawing of the transmission path of the load at the time of the vehicle front collision in the vehicle body front part structure concerning this Embodiment. It is a cross-sectional schematic diagram of the periphery of the fastening portion of the load path included in the vehicle body front part structure according to the present embodiment. It is a cross-sectional schematic diagram of the periphery of the fastening portion of the load path included in the vehicle body front part structure according to the present embodiment.

  Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. 1 and 2 are perspective views of the vehicle body front structure according to the present embodiment. In FIG. 1, the vehicle body front part structure according to the present embodiment is shown from the upper side, and in FIG. 2, the vehicle body front part structure according to the present embodiment is shown from the lower side.

  As shown in FIGS. 1 and 2, an engine room 1 for mounting a vehicle component such as an engine is provided inside a front part of a vehicle body such as an automobile. A bumper member 2 extending in the vehicle width direction is disposed on the front side of the engine room 1. The front end portions of the pair of side members 3 are fixed to both end portions of the bumper member 2 in the vehicle width direction. For example, the bumper member 2 and the side member 3 are joined by welding or the like. These side members 3 are arranged to extend in the front-rear direction of the vehicle at positions separated by a certain distance. A dash panel 4 extending in the vehicle width direction is fixed to the rear end portion of the side member 3. For example, the side member 3 and the dash panel 4 are joined by welding or the like. The dash panel 4 is formed of a plate-like member and is disposed at a position that partitions the engine room 1 and the vehicle compartment. The engine room 1 is defined by the bumper member 2, the side member 3, the dash panel 4, and the like.

  A pair of lamp support braces 5 extending in the vertical direction are fixed to the inner side surface of the front end portion of each side member 3. For example, the side member 3 and the lamp support brace 5 are joined by welding or the like. The lamp support brace 5 functions as a front frame structure member of the vehicle body front structure according to the present embodiment. An upper cross member 6 extending in the vehicle width direction is fixed to both upper ends of the lamp support braces 5. On the other hand, a lower cross member 7 extending in the vehicle width direction is fixed to both lower ends of the lamp support braces 5. Further, a lower bumper member 8 extending in the vehicle width direction is fixed near the lower end of the lamp support brace 5 and slightly above the lower cross member 7. For example, the lamp support brace 5, the upper cross member 6, the lower cross member 7, and the lower bumper member 8 are joined by welding or the like.

  On the side of the upper cross member 6, a hood ridge member 9 is provided continuously. The upper cross member 6 and the hood ridge member 9 are formed, for example, by punching and bending a single steel plate. The upper cross member 6 and the hood ridge member 9 may be provided as separate members, and these may be joined by welding or the like.

  A substantially H-shaped suspension frame 10 is disposed in a lower portion of the engine room 1 in plan view. The suspension frame 10 has a body portion extending in the vehicle width direction and a pair of arm portions extending in the vehicle front-rear direction in the vicinity of both ends of the body portion in the vehicle width direction. A pair of load paths 11 extending in the front-rear direction of the vehicle are disposed below the side members 3. These load paths 11 constitute a collision countermeasure member, the front end portion being fixed to the ramp support brace 5 and the lower cross member 7, and the rear end portion being fixed to the front arm portion of the suspension frame 10. Yes. As will be described in detail later, the load path 11 is fixed to the ramp support brace 5 and the lower cross member 7 and the suspension frame 10 by bolts and nuts constituting a fastening member.

  The vehicle body front structure according to the present embodiment minimizes deformation of the passenger compartment by deforming such a structural member to absorb the collision energy generated at the time of a vehicle front collision. Hereinafter, a load transmission path at the time of a vehicle front collision in the vehicle body front part structure according to the present embodiment will be described. FIG. 3 is an explanatory diagram of a load transmission path at the time of a vehicle frontal collision in the vehicle body front structure according to the present embodiment. In the following, it is assumed that a load at the time of a vehicle frontal collision is input to the bumper member 2.

  A load generated at the time of a vehicle front collision is input to the bumper member 2. The load input to the bumper member 2 is transmitted to the side member 3 fixed thereto. A lamp support brace 5 is fixed to the front end portion of the side member 3. For this reason, the load applied to the side member 3 is also transmitted to the lamp support brace 5. A load path 11 is fixed to the lower end portion of the lamp support brace 5. For this reason, the load applied to the lamp support brace 5 is also transmitted to the load path 11. The load transmitted to the load path 11 is transmitted to the suspension frame 10 fixed to the rear end portion.

  For example, when a load F1 exceeding the proof stress (proof load) of the side member 3 is applied, the side member 3 is deformed (crushed) in the front-rear direction (more specifically, the rear side) of the vehicle. With the deformation of the side member 3, the lamp support brace 5 moves to the rear side of the vehicle. A load F <b> 2 is applied to the load path 11 as the ramp support brace 5 moves. When the load F2 exceeds the proof stress of the load path 11, the load path 11 is deformed (crushed). In the vehicle body front structure according to the present embodiment, the side member 3 and the load path 11 are deformed in the load transmission process in this way, so that the collision energy at the time of the vehicle front collision is absorbed.

  Here, a manner of fixing the load path 11 to the lamp support brace 5 and the lower cross member 7 included in the vehicle body front structure according to the present embodiment will be described. 4 and 5 are schematic sectional views of the periphery of the fastening portion of the load path 11 included in the vehicle body front portion structure according to the present embodiment. 4 and 5, the front side of the vehicle is indicated as FR and the rear side of the vehicle is indicated as RR for convenience of explanation.

  FIG. 4 shows a cross section corresponding to a vertical plane passing through bolts and nuts that fasten the load path 11 to the lamp support brace 5 and the lower cross member 7. In FIG. 5, the cross section corresponding to the horizontal surface which passes the upper side of the volt | bolt and nut which fasten the load path 11 to the lamp support brace 5 and the lower cross member 7 is shown.

  As shown in FIGS. 4 and 5, the load path 11 is fastened to the lamp support brace 5 and the lower cross member 7 by two bolts 12 arranged in the front-rear direction of the vehicle and a corresponding nut 13. Yes. In the following, the configuration of one load path 11 will be described. Since the other load path 11 has the same configuration as the one load path 11, the description thereof is omitted. Hereinafter, the configuration of the lamp support brace 5, the lower cross member 7, and the load path 11 will be described.

  In the vehicle body front structure according to the present embodiment, the lower cross member 7 is configured by stacking two steel plates. As shown in FIG. 4, the lower cross member 7 includes a front surface portion 71 disposed substantially vertically on the front side of the vehicle, and a support provided so as to extend substantially horizontally from the lower end portion of the front surface portion 71 to the rear side. It has a surface portion 72 and generally has an L shape in a side view. A pair of holes 721 are formed in the support surface portion 72 at positions separated by a certain distance in the vehicle front-rear direction. These holes 721 are provided with dimensions that allow the shaft portion 121 of the bolt 12 to pass therethrough but not allow the head portion 122 to pass therethrough.

  Further, as shown in FIG. 5, the lower cross member 7 is a first wall surface provided to extend rearward from the front surface portion 71 at an end portion in the vehicle width direction (here, the left side end portion). Part 73a, and a second wall surface part 73b provided to extend rearward from the front surface part 71 at a position away from the first wall surface part 73a by a certain distance. The first wall surface portion 73a and the second wall surface portion 73b are disposed to face each other. The first wall surface portion 73a is formed by bending two steel plates constituting the lower cross member 7 rearward. On the other hand, the second wall surface portion 73b is formed by bending only one rear steel plate out of the two steel plates constituting the lower cross member 7 to the rear side. The second wall surface portion 73b is formed at a position away from the base end portion of the first wall surface portion 73a by a distance slightly longer than at least the dimension in the width direction of the load path 11 (dimension in the vehicle width direction).

  As shown in FIG. 4, the load path 11 includes an upper surface portion 111 and a lower surface portion 112 that are arranged to face each other in the vertical direction. A pair of cylindrical portions 113 is provided between the upper surface portion 111 and the lower surface portion 112. Further, holes 114 and 115 are formed in the upper surface portion 111 and the lower surface portion 112 at positions corresponding to the cylindrical portion 113, respectively. The inner diameters of the holes 114 and 115 and the cylindrical portion 113 are set to dimensions that allow the shaft portion 121 of the bolt 12 to pass through.

  As shown in FIG. 4, the lamp support brace 5 includes a lower surface portion 51 having a planar shape. A pair of holes 511 are formed in the lower surface portion 51 at positions separated by a certain distance in the front-rear direction of the vehicle. These holes 511 are provided with dimensions that allow the shaft portion 121 of the bolt 12 to pass therethrough and not allow the nut 13 to pass therethrough.

  When the load path 11 is fixed to the lamp support brace 5 and the lower cross member 7, the load path 11 is disposed between the lower surface portion 51 of the lamp support brace 5 and the support surface portion 72 of the lower cross member 7. In this case, the load path 11 is arranged so that the hole 114 in the upper surface portion 111 coincides with the hole 511 in the lower surface portion 51 of the lamp support brace 5 and the hole 115 in the lower surface portion 112 coincides with the hole 721 in the support surface portion 72. Is done. By arranging in this way, the front end portion of the load path 11 is in a space surrounded by the front surface portion 71 of the lower cross member 7, the first wall surface portion 73a, and the second wall surface portion 73b, as shown in FIG. It will be in an arranged state.

  The load path 11 is fastened by the bolt 12 and the nut 13 in such a state. Specifically, the shaft portion 121 of the bolt 12 is inserted from below the support surface portion 72 of the lower cross member 7 so as to pass through the hole 721 and the hole 115. Then, the nut 13 is attached to the shaft 121 protruding upward through the cylindrical portion 113, the hole 114, and the hole 511. Thereby, the load path 11 is fixed in a state of being sandwiched between the lower surface portion 51 of the lamp support brace 5 and the support surface portion 72 of the lower cross member 7.

  As described above, in the vehicle body front structure according to the present embodiment, the lower cross member 7 includes the front surface portion 71 that faces the front end portion of the load path 11 and the support surface portion 72 that supports the lower surface of the front end portion of the load path 11. The load path 11 is fixed by fastening members (bolts 12 and nuts 13) via the support surface portion 72. For this reason, even when the fastening member is broken, the load path 11 is supported by the support surface portion 72 of the lower cross member 7. On the other hand, a load is transmitted from the front surface 71 of the lower cross member 7 to the load path 11 at the time of a vehicle front collision. As a result, the load path 11 can be deformed according to the transmitted load, so that it is possible to absorb the collision energy at the time of the vehicle front collision. As a result, the load path 11 extending in the vehicle front-rear direction at a position different from the side member 3 can be prevented from falling off, and the function as a collision countermeasure member can be exhibited.

  In particular, in the vehicle body front structure according to the present embodiment, the load path 11 is fixed by a fastening member in a state of being sandwiched between the lower surface portion of the lamp support brace 5 and the support surface portion 72 of the lower cross member 7. is doing. For this reason, at the time of a vehicle front collision, the load is transmitted not only from the front surface 71 of the lower cross member 7 but also to the load path 11 via the lamp support brace 5. Thereby, since the load generated at the time of a vehicle front collision can be transmitted to the load path 11 with high accuracy, the function as a collision countermeasure member can be sufficiently exhibited.

  Further, in the vehicle body front structure according to the present embodiment, the front end portion of the load path 11 is connected to the front surface portion 71 of the lower cross member 7 and a pair of members while being fixed to the lamp support brace 5 and the lower cross member 7. It arrange | positions in the space enclosed by the wall surface part (1st wall surface part 73a and 2nd wall surface part 73b). For this reason, even when the fastening member is broken, the displacement of the load path 11 in the vehicle width direction can be regulated, so that the load generated at the time of the vehicle front collision can be reliably transmitted to the load path 11. As a result, the load path 11 can reliably function as a collision countermeasure member.

  Furthermore, in the vehicle body front structure according to the present embodiment, the load path 11 is prevented from falling off by the support surface portion 72 of the lower cross member 7. For this reason, there is no need to provide a special member for preventing the load path 11 from falling off, so that the vehicle can be reduced in weight and the manufacturing cost can be reduced as compared with the case where such a member is provided. Can be planned.

  Furthermore, in the vehicle body front structure according to the present embodiment, the lower cross member 7 is provided with a support surface portion 72 that supports the load path 11. For this reason, since the load path 11 can be temporarily supported by the support surface portion 72 at the time of assembly, the operator can freely use both hands, and the efficiency of the assembly work can be improved.

  In the above, the fixed aspect in the front-end part of the load path 11 is demonstrated as an example. However, it is needless to say that the above-described fixed manner of the load path 11 is not limited to the front end portion of the load path 11 and can be applied to the rear end portion. That is, the present invention can also be applied to a manner in which the load path 11 is fixed to the suspension frame 10. In this case, for example, it is conceivable that the suspension frame 10 is provided with a flat surface portion that overlaps the upper surface portion 111 of the load path 11 and a support surface portion that supports the lower surface portion 112 of the load path 11. By configuring the suspension frame 10 in this manner, it is possible to prevent the load path 11 extending in the vehicle front-rear direction at a position different from that of the side member 3 from being dropped and to exhibit a function as a collision countermeasure member. It is preferable as an embodiment to apply the above-described fixing manner of the vehicle body front portion structure to both the front end portion and the rear end portion of the load path 11.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

DESCRIPTION OF SYMBOLS 1 Engine room 2 Bumper member 3 Side member 4 Dash panel 5 Lamp support brace 51 Lower surface part 511 Hole 6 Upper cross member 7 Lower cross member 71 Front surface part 72 Support surface part 721 hole 73a 1st wall surface part 73b 2nd wall surface part 8 Lower bumper member 9 Hood Ridge Member 10 Suspension Frame 11 Load Path 111 Upper Surface Part 112 Lower Surface Part 113 Cylindrical Part 114, 115 Hole 12 Bolt 121 Shaft Part 122 Head Part 13 Nut

Claims (3)

A pair of side members extending in the front-rear direction of the vehicle at positions spaced apart from each other, a pair of front skeleton structure members fixed to the front end portions of the side members and extending in the vertical direction of the vehicle, A cross member extending in the vehicle width direction and fixed to both lower ends of the front skeleton structure member, and a front end portion is fixed to an end portion of the cross member in the vehicle width direction and extends in the front-rear direction of the vehicle A pair of anti-collision members,
The cross member is provided with a front surface portion facing the front end portion of the collision countermeasure member and a support surface portion supporting the lower surface of the front end portion of the collision countermeasure member, and the collision countermeasure member is fixed by a fastening member via the support surface portion. Car body front structure characterized by   The fastening member in a state where the lower surface portion of the front skeleton structure member is opposed to the upper surface portion of the collision countermeasure member and the collision countermeasure member is sandwiched between the lower surface portion of the front skeleton structure member and the support surface portion The vehicle body front part structure according to claim 1, wherein the vehicle body front part structure is fixed. A pair of wall surface portions that extend rearward from the front surface portion of the cross member and face each other are provided, and the front end portion of the collision countermeasure member is disposed in a space surrounded by the pair of wall surface portions and the front surface portion of the cross member. The vehicle body front part structure according to claim 1.

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