JP2009120012A - Body front structure - Google Patents

Abstract

An object of the present invention is to provide a vehicle body front structure capable of obtaining a good shock absorbing function by using a shock absorbing member while reinforcing the vehicle body.
A vehicle body front structure includes a front side member that extends in the vehicle front-rear direction, a crash box that is fixed to a front end portion of each front side member in the vehicle front-rear direction, and a crash box. And a strength gusset 50 interposed between the fender support upper 32 and the fender support upper 32. The strength gusset 50 has an upper end fixed to the fender support upper 32 and a lower end fixed to a bracket 54 that is bonded and fixed to the crash box 18.
[Selection] Figure 1

Description

  The present invention relates to a vehicle body front structure.

A technique is known in which a crash beam composed of a material different from a frame such as an aluminum material or a synthetic resin material is fixed to a front end portion of an upper frame and an upper surface of a lower frame with a structural adhesive (for example, , See Patent Document 1).
JP-A-6-255533

  However, the conventional techniques as described above are for causing the crash beam to function only as an impact absorbing member, and no reinforcement structure using the impact absorbing member has been considered.

  In view of the above facts, the present invention has an object to obtain a vehicle body front structure capable of obtaining a good shock absorbing function with the shock absorbing member while reinforcing the vehicle body using the shock absorbing member. .

  The vehicle body front part structure according to the first aspect of the present invention is fixed to the first skeleton member extending in the vehicle front-rear direction and the front end portion of the first skeleton member in the vehicle front-rear direction. An impact absorbing member for absorbing an input impact load; a first fixing portion fixed to the impact absorbing member by adhesion; a second fixing portion fixed to a second skeleton member constituting the vehicle body; A connecting structure having a connecting portion that connects the second fixing portion and the first fixing portion.

  In the vehicle body front structure according to the first aspect, the second skeleton member constituting the vehicle body is connected to the shock absorbing member via the connection structure. Accordingly, the second skeleton member is reinforced by the impact absorbing member fixed to the first skeleton member. Here, in the front structure of the vehicle body, the first fixing portion of the connection structure is fixed to the shock absorbing member by adhesion. For example, when an impact load of a predetermined value or more is input to the shock absorbing member. The adhesion part of a connection part agent peels. For this reason, a 2nd frame member does not restrain an impact-absorbing member via a connection structure, and the required impact-absorbing characteristic of an impact-absorbing member is ensured.

  Thus, in the vehicle body front part structure according to the first aspect, a good shock absorbing function can be obtained by the shock absorbing member while reinforcing the vehicle body using the shock absorbing member.

  The vehicle body front structure according to the invention described in claim 2 has a first skeleton member extending in the vehicle front-rear direction and a longitudinal direction in the vehicle front-rear direction, and a rear end portion in the vehicle front-rear direction of the first skeleton member. An impact absorbing member that is fixed to the front end of the vehicle in the longitudinal direction and absorbs an impact load that is input backward in the longitudinal direction of the vehicle, and extends in the vehicle width direction so as to cross the upper side in the vertical direction of the vehicle with respect to the impact absorbing member. A second skeleton member for supporting a vehicle component, a first fixing portion fixed to the shock absorbing member by adhesion, and the second skeleton on an upper side in the vehicle vertical direction with respect to the first fixing portion. A connecting structure having a second fixing portion fixed to the member, and a connecting portion connecting the second fixing portion and the first fixing portion.

  In the vehicle body front structure according to the second aspect, the second skeleton member for supporting the vehicle component is connected to the shock absorbing member via the connection structure. Accordingly, the second skeleton member is reinforced by the impact absorbing member fixed to the first skeleton member. Here, in the front structure of the vehicle body, the first fixing portion of the connection structure is fixed to the shock absorbing member by adhesion. For example, when an impact load of a predetermined value or more is input to the shock absorbing member. The adhesion part of a connection part agent peels. For this reason, a 2nd frame member does not restrain an impact-absorbing member via a connection structure, and the required impact-absorbing characteristic of an impact-absorbing member is ensured.

  Thus, in the vehicle body front part structure according to the second aspect, a good shock absorbing function can be obtained by the shock absorbing member while reinforcing the vehicle body using the shock absorbing member.

  A vehicle body front part structure according to a third aspect of the invention is the vehicle body front part structure according to the first or second aspect, wherein the shock absorbing member is made of a material containing resin.

  In the vehicle body front part structure according to the third aspect, the impact absorbing member made of a material containing resin reinforces the second skeleton member via the connecting structure. Since the shock absorbing member containing resin material absorbs shock while being broken minutely, the shock absorbing characteristics are likely to change when part of it is constrained. Since the restraint of the shock absorbing member via the body is released, the shock absorbing member is ensured with the required shock absorbing characteristics.

  The vehicle body front part structure according to a fourth aspect of the invention is the vehicle body front part structure according to any one of the first to third aspects, wherein the first fixing part is configured as a bracket independent of the connecting part. Has been.

  In the vehicle body front part structure according to claim 4, since the first fixed part of the connection structure is a bracket formed independently of the connection part, the dimension and shape for securing the required adhesion area to the shock absorbing member can be easily achieved. Obtainable.

  According to a fifth aspect of the present invention, in the front body structure of the fourth aspect, the bracket is made of the same material as the shock absorbing member.

  In the vehicle body front structure according to the fifth aspect, since the shock absorbing member and the bracket are made of the same material, it is easy to ensure the required adhesive strength with a simple or compact structure.

  As described above, the vehicle body front structure according to the present invention has an excellent effect that a good shock absorbing function can be obtained by the shock absorbing member while reinforcing the vehicle body using the shock absorbing member.

  A vehicle body front structure 10 according to an embodiment of the present invention will be described with reference to FIGS. First, a schematic overall configuration of the vehicle body front part structure 10 will be described, and then a support part reinforcing structure 11 which is a main part of the present invention will be described in detail. In the figure, the arrow FR indicates the forward direction in the vehicle longitudinal direction, the arrow UP indicates the upward direction in the vehicle vertical direction, the arrow RH indicates the right side (outward in the vehicle width direction) when facing the arrow FR direction, and the arrow LH indicates The left side (outside in the vehicle width direction) when facing the arrow FR direction is shown.

(Schematic overall structure of the front body structure)
FIG. 5 shows a schematic overall configuration of the vehicle body front structure 10 in a perspective view. As shown in this figure, the vehicle body front structure 10 includes a pair of left and right front side members 12 as a first skeleton member that is elongated in the vehicle longitudinal direction. Each front side member 12 has a rear end portion 12 </ b> A connected to a dash panel 16 that separates the engine compartment E and the vehicle compartment C via an impact absorbing material 14. Each front side member 12 has a front end portion 12B connected to a bumper reinforcement (not shown) extending in the vehicle width direction via a crash box 18 as an impact absorbing member described later.

  The vehicle body front structure 10 includes a capacitor support 20 disposed between a pair of left and right crash boxes 18. Fender supports 22 are coupled to both outer sides of the capacitor support 20 in the vehicle width direction.

  The capacitor support 20 extends in the vehicle width direction and is disposed in parallel so as to be substantially opposed to each other in the vehicle vertical direction, and the capacitor support upper 24 and the capacitor support lower 26. A pair of left and right capacitor support sides 28 that connect both ends in the vehicle width direction in the vehicle vertical direction, and a capacitor support center 30 that connects the center portions in the vehicle width direction of the capacitor support upper 24 and the capacitor support lower 26 in the vehicle vertical direction. ing. Accordingly, the capacitor support 20 is formed as a frame body having a substantially rectangular shape when viewed from the front. In this embodiment, the capacitor support 20 has a rectangular frame shape that is long in the vehicle width direction.

  The left and right fender supports 22 include a fender support upper 32 extending substantially along the vehicle width direction, a fender support lower 34 disposed below the fender support upper 32 in the vehicle vertical direction, and the fender support upper 32. And a fender support side 36 that connects the vehicle width direction outer side end of the fender support lower 34 in the vehicle vertical direction, and a fender support rear 38 that bridges the fender support side 36 and the rear end of the crash box 18. Yes.

  In this embodiment, both the outer end in the vehicle width direction of the capacitor support upper 24 and the inner end in the vehicle width direction of each fender support upper 32 are overlapped with each other, and the upper end portion of the capacitor support side 28 is overlapped with the overlapping portion. Are combined. Therefore, in the vehicle body front part structure 10, as shown in FIG. 7, the fender support upper 32 extends in the vehicle width direction so as to cross over the crash box 18 in a plan view. Further, as shown in FIGS. 5 and 6, the inner end of each fender support lower 34 in the vehicle width direction is connected to the lower portion of the corresponding capacitor support side 28 via a bracket 40.

  Further, as shown in FIG. 5, apron upper members 42 are respectively provided on the vehicle body upper sides of the left and right front side members 12. The left and right apron upper members 42 extend substantially along the vehicle longitudinal direction, the rear end portion 42A is coupled to the dash panel 16, and the front end portion 42B is connected to the capacitor support upper 24 and the fender support upper 32. It is connected to the overlapping part.

  Thereby, in the vehicle body front structure 10, the capacitor support 20 and the fender support 22 are supported by the vehicle body to form a vehicle body structure (framework). As shown in FIG. 6, L-shaped brackets 44 are coupled to the outer ends of the fender support upper 32 of the fender support 22 in the vehicle width direction. The front portion of a fender panel 46 as a vehicle body component is coupled to the L-shaped bracket 44 as shown in FIG.

  Further, as shown in FIG. 5, an oil cooler 48, which is a heavy object as a vehicle body component, is provided in a space surrounded by the fender support 22 and the capacitor support side 28 (in this embodiment, the space on the right side of the vehicle body). It is arranged. The oil cooler 48 is disposed close to the fender support side 36 side. On the other hand, a condenser (air conditioning condenser), a radiator, and the like as vehicle components (not shown) are fixed to the condenser support 20.

  In the vehicle body front structure 10 described above, each front side member 12, shock absorber 14, capacitor support 20 (capacitor support upper 24, capacitor support lower 26, a pair of left and right capacitor support sides 28), and fender support 22 (fender support). The upper 32, the fender support lower 34, the fender support side 36, and the fender support rear 38) are made of a metal material such as aluminum or an aluminum alloy.

(Support structure reinforcement structure)
As shown in FIG. 5, a strength gusset 50 is interposed between the crash box 18 and a portion of the fender support upper 32 on the inner end side in the vehicle width direction. Thereby, the support part reinforcement structure 11 by which the capacitor | condenser support 20 and the fender support 22 are supported by each crash box 18 (each front side member 12 via) is comprised. Therefore, in this embodiment, the fender support upper 32 corresponds to the second skeleton member in the present invention. In a broad sense, the capacitor support 20 and the fender support 22 correspond to the second skeleton member in the present invention. This will be specifically described below.

  As shown in FIG. 3, the crash box 18 has a substantially wave-shaped cross-sectional shape. In this embodiment, the crash box 18 has two intermediate walls 18C between the upper wall 18A and the lower wall 18B, and is configured such that these are alternately connected by side walls 18D in the vehicle width direction. . The crash box 18 is made of a resin material. The crash box 18 has a lower strength (lower rigidity) than the front side member 12 (impact absorber 14) with respect to a compressive load along the longitudinal direction of the vehicle body that coincides with each longitudinal direction. As a result, the crash box 18 reduces the impact load (dynamic load) transmitted to the front side member 12 while being compressed and destroyed when a backward compression load of a predetermined value or more is input from the front end side. ing.

  As shown in FIG. 4, the strength gusset 50 includes a pair of wall portions 50A facing in the vehicle front-rear direction and a plurality (three in this embodiment) for connecting the pair of wall portions 50A between the pair of wall portions 50A. The inner rib 50B and the engagement piece 50C suspended from a portion slightly inward in the vehicle width direction with respect to the vehicle width direction intermediate portion of the pair of wall portions 50A are integrally formed. The strength gusset 50 is formed, for example, as a casting of metal material such as aluminum or aluminum alloy, an extruded material, or the like.

  Further, the strength gusset 50 has a plurality of bolt holes 50D provided on both sides in the vehicle width direction with respect to the engagement piece 50C at the upper part of the pair of wall portions 50A. As shown in FIGS. 1 and 2, the strength gusset 50 is fixed to the fender support upper 32 by bolts 52 inserted through the respective bolt holes 50 </ b> D being screwed into nuts (weld nuts) 53.

  1 to 4, the strength gusset 50 is fixed to the upper wall 18 </ b> A of the crash box 18 via a bracket 54. In this embodiment, a pair of front and rear brackets 54 are provided corresponding to each of the pair of wall portions 50A. As shown in FIGS. 2 and 4, each bracket 54 is configured to have a flat plate-like base portion 54 </ b> A and a pair of front and rear standing walls 54 </ b> B that are erected from the base portion 54 </ b> A and sandwich the corresponding wall portion 50 </ b> A. Each standing wall 54B is formed with a bolt hole 54C. In this embodiment, each bracket 54 is made of a resin material. That is, in the vehicle body front structure 10, the crash box 18 and the bracket 54 are made of the same material.

  On the other hand, as shown in FIG. 4, bolt holes 50 </ b> E are formed corresponding to the bolt holes 54 </ b> C of the strength gusset 50 on the inner side in the vehicle width direction than the strength gusset 50 in each wall portion 50 </ b> A of the strength gusset 50. Therefore, the strength gusset 50 and the bracket 54 are fixed to each other by the bolt holes 54C, the bolts 56 inserted through the bolt holes 50E, and the nuts 58 screwed into the bolts 56.

  In the vehicle body front structure 10, as shown in FIGS. 2 and 3, the base portion 54 </ b> A of the bracket 54 is fixed to the upper wall 18 </ b> A of the crash box 18 with an adhesive A. Accordingly, the crash box 18 is not formed with a bolt hole or the like for attaching the bracket 54 (strength gusset 50).

  In the fixed posture of the strength gusset 50 via the bracket 54 with respect to the crash box 18, the engagement piece 50C of the strength gusset 50 is located in contact with or very close to the side wall 18D on the upper end side of the crash box 18 in the vehicle vertical direction. ing.

  As described above, in the vehicle body front structure 10, the fender support upper 32 is connected (supported) to the crash box 18 via the strength gusset 50 and the bracket 54. Therefore, in this embodiment, the strength gusset 50 and the bracket 54 correspond to the connection structure in the present invention. Moreover, the upper part (fixed part to the fender support upper 32 with the volt | bolt 52) of a pair of wall part 50A in the intensity | strength gusset 50 is equivalent to the 2nd fixing | fixed part in this invention. On the other hand, the bracket 54 corresponds to the first fixing portion in the present invention, and the pair of wall portions 50A and the inner rib 50B of the strength gusset 50 correspond to the connecting portion in the present invention.

  Next, the operation of this embodiment will be described.

  In the vehicle body front structure 10 having the above configuration, the capacitor support 20 and the fender support 22 are supported to the vehicle body via the apron upper member 42 and the crash box 18. The fender support 22 supports the fender panel 46 and the oil cooler 48 with respect to the vehicle body, and the capacitor support 20 supports the capacitor and radiator with respect to the vehicle body.

  For example, when the capacitor vibrates in the vertical direction of the vehicle, the capacitor support 20 has a force to deform the capacitor support 20 (relative angular displacement occurs between the capacitor support upper 24 and the left and right capacitor support sides 28). Works.

  Here, in the vehicle body front part structure 10, the fender support upper 32 integrated with the capacitor support upper 24 is connected to the crash box 18 via the strength gusset 50 of the support part reinforcing structure 11. The deformation of the capacitor support 20 due to the is suppressed. For this reason, the fall of the durable strength of the capacitor | condenser support 20 (each junction part etc.) is suppressed. Similarly, the deformation | transformation of the fender support 22 is suppressed, The fall of the durable strength of the fender support 22 (each junction part etc.) is suppressed.

  On the other hand, when a vehicle (automobile or the like) to which the vehicle body front structure 10 is applied reaches a frontal collision, a compressive load along the vehicle longitudinal direction acts on at least one of the left and right crash boxes 18 via bumper reinforcement. To do. When this compressive load is a predetermined value or more, the crash box 18 is compressed and broken in the longitudinal direction while supporting a part of the collision load. Thereby, a part of the impact energy accompanying the collision is absorbed, and the load acting on the front side member 12, that is, the vehicle body is relaxed.

  Here, in the vehicle body front structure 10, since the bracket 54 is bonded and fixed to the crash box 18 with the adhesive A, the vehicle to which the vehicle body front structure 10 is applied is subjected to a frontal collision (for example, exceeding a light collision). When the collision occurs, the fixing portion of the bracket 54 by the adhesive A is peeled off. Accordingly, the crash box 18 is not restrained by the fender support upper 32 connected via the bracket 54 and the strength gusset 50, but is compressed and broken as the collision energy is absorbed. That is, the required breaking mode (shock absorbing behavior) of the crash box 18 is ensured.

  As described above, in the vehicle body front structure 10 according to this embodiment, the crash box 18 can be used to reinforce the capacitor support 20 and the fender support 22, and the crash box 18 can provide a good shock absorbing function. .

  In particular, the resin crash box 18 has low ductility and toughness as compared with a metal one, so that the fracture mode (deformation behavior) is easily affected by restraint. For example, in the structure in which the strength gusset 50 is directly fixed to the crash box 18 using the bolt 100 and the nut 102 as in the comparative example shown in FIG. 8, the breaking mode of the crash box 18 changes with the bolt 100 as a starting point. Therefore, special measures are required to ensure the required shock absorbing performance.

  On the other hand, in the vehicle body front structure 10, the crash box 18 is in a free state at the time of a collision as described above, so that it is possible to obtain good shock absorption characteristics (easily designed for obtaining good shock absorption characteristics). Is).

  In the vehicle body front structure 10, since the bracket 54, which is a separate member from the strength gusset 50, is bonded to the crash box 18, the design flexibility of the strength gusset 50 and the bracket 54 is high. For example, the strength gusset 50 can be made of a metal material to ensure a required strength (rigidity), and simplifies the mold and processing as compared with a configuration having an adhesive portion to the crash box 18. it can. That is, the strength gusset 50 can be formed as a casting or an extruded product.

  On the other hand, the bracket 54 is easy to obtain a dimension and shape that secures a required adhesion area to the crash box 18. Moreover, in the vehicle body front structure 10, since the bracket 54 is made of a resin material that is the same material as the crash box 18, the required adhesion between the crash box 18 and the bracket 54 can be achieved with a simple configuration or a compact configuration. Easy to ensure strength.

  In the above-described embodiment, an example in which the bracket 54 is bonded and fixed to the upper wall 18A of the crash box 18 is shown. However, the present invention is not limited to this, and for example, the bracket 54 is attached to the side wall 18D of the crash box 18. You may make it adhere | attach.

  In the above-described embodiment, the example in which the present invention is applied to the vehicle body front structure 10 including the fender support 22 has been described. However, the present invention is not limited to this, and for example, the capacitor support upper 24 ( A portion extending in the width direction may be supported by the crash box 18 via the strength gusset 50 and the bracket 54.

  Further, in the above-described embodiment, an example in which the crash box 18 and the bracket 54 are made of resin is shown. However, the present invention is not limited to this, and for example, the crash box 18 and the bracket 54 are made of fiber reinforced resin or the like. You may do it. Needless to say, the present invention is not limited to the shape of the crash box 18 described above.

  In addition, the present invention is not limited to the structure of each part in the above-described embodiment, and it goes without saying that various modifications can be made.

It is a perspective view which shows the support part reinforcement structure which comprises the vehicle body front part structure which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. It is a perspective view perspective view which shows the state before the intensity | strength gusset which comprises the vehicle body front part structure which concerns on embodiment of this invention, and a bracket. 1 is a perspective view showing a schematic overall configuration of a vehicle body front structure according to an embodiment of the present invention. It is a side view which shows the front side part of the vehicle body front part structure which concerns on embodiment of this invention. It is a top view which shows the vehicle width direction outer side part of the vehicle body front part structure which concerns on embodiment of this invention. It is sectional drawing corresponding to FIG. 3 which shows the support part reinforcement structure which concerns on the comparative example with embodiment of this invention.

Explanation of symbols

10 Front body structure 12 Front side member (first frame member)
18 Crash box (shock absorbing member)
20 Capacitor support (second frame member)
22 Fender support (second frame member)
32 Fender support upper (second frame member)
50 Strength gusset (linkage structure)
50A wall (connecting part, second fixing part)
54 Bracket (first fixed part)
A Adhesive

Claims (5)

A first skeleton member extending in the vehicle longitudinal direction;
An impact absorbing member that is fixed to the front end of the first skeleton member in the vehicle longitudinal direction and absorbs an impact load that is input backward in the vehicle longitudinal direction;
A first fixing portion fixed to the shock absorbing member by bonding, a second fixing portion fixed to a second skeleton member constituting the vehicle body, and a connection for connecting the second fixing portion and the first fixing portion. A connecting structure having a portion;
Body front structure with A first skeleton member extending in the vehicle longitudinal direction;
Shock absorption for absorbing an impact load that is elongated in the vehicle longitudinal direction, the rear end of the vehicle longitudinal direction is fixed to the front end of the first skeleton member in the vehicle longitudinal direction, and is input rearward in the vehicle longitudinal direction. Members,
A second skeleton member that extends in the vehicle width direction so as to cross the upper side in the vehicle vertical direction with respect to the shock absorbing member, and supports vehicle components;
A first fixing portion fixed to the shock absorbing member by bonding; a second fixing portion fixed to the second skeleton member on the upper side in the vehicle vertical direction with respect to the first fixing portion; and the second fixing portion. A connecting structure having a connecting portion for connecting the first fixed portion;
Body front structure with   The vehicle body front part structure according to claim 1, wherein the shock absorbing member is made of a material containing resin.   The vehicle body front part structure according to any one of claims 1 to 3, wherein the first fixing portion is configured as a bracket independent of the connecting portion.   The vehicle body front part structure according to claim 4, wherein the bracket is made of the same material as the shock absorbing member.

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