JP2019038497A - Front part vehicle body structure of vehicle - Google Patents

Abstract

To satisfy both of alleviation of an impact at the time of front collision and assurance of a rigidity near an upper facer at a high level.SOLUTION: An upper end part of a bumper facer 10 is covered with an upper facer 20. A reinforcement member 30, which extends in a cross direction, is provided between the bumper facer 10 and the upper facer 20. The reinforcement member 30 has a front part 32 as a high rigidity part and a rear part 31 as a low rigidity part with a prescribed position α in the cross direction as a boundary. Setting of the low rigidity part and the high rigidity part can be performed by, for example, differing rib structures (35, 36, 37), which are formed on the front part and the rear part of the reinforcement member 30 from each other.SELECTED DRAWING: Figure 9

Description

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

  In some vehicles, an outer surface of a front end portion thereof is configured by a bumper fascia (facial lower member) and an upper facer (facia upper member) disposed so as to cover the upper end portion thereof.

  Patent Document 1 discloses a structure in which a reinforcing bracket is disposed below a fascia upper member. The reinforcing bracket is formed so as to be rearwardly lowered, and a rear end portion (lower end portion) thereof is connected to the vehicle body strength member, while a front end portion (upper end portion) thereof is positioned directly below the facer upper member. And when a weak part is formed in a reinforcement bracket and a collision load is inputted to a fascia upper member at the time of a front collision, the reinforcement bracket is designed to break an impact by breaking from the weak part. .

JP2015-136947A

  As described in Patent Document 1, the impact relaxation by the reinforcing bracket is preferable from the viewpoint of pedestrian protection and the like. However, the setting that prioritizes impact mitigation is not preferable in that the upper fascia (facia upper member) and the rigidity (strength) in the vicinity thereof tend to be insufficient, and there is a high possibility of causing large vehicle body deformation. It becomes.

  The present invention has been made in view of the circumstances as described above, and its object is to provide a front body of a vehicle that can satisfy both the impact relaxation at the time of a forward collision and the securing of rigidity in the vicinity of the upper fascia at a high level. To provide a structure.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1,
The front structure of the vehicle is such that the upper end of the bumper fascia is covered with an upper fascia,
Between the bumper facer and the upper facer, a reinforcing member extending in the front-rear direction is disposed,
The reinforcing member is formed so that the front portion is a high-rigidity portion and the rear portion is a low-rigidity portion with a predetermined position in the front-rear direction as a boundary.
It is like that.

  According to the above solution, when a load in the rearward and downward direction is applied to the upper fascia 20 due to a forward collision (particularly a light collision), the collision load is firmly received by the front portion which is a highly rigid portion of the reinforcing member. It is done. As a result, deformation of the upper facer and the upper end of the bumper facer positioned below the upper facer is prevented or suppressed, and further, deformation and breakage of the rear member of the upper facer 20 are prevented or suppressed. When the collision load increases, the rear portion of the reinforcing member that is a low-rigidity portion is deformed and load absorption is performed. Thereby, when the front obstacle which collided is a pedestrian, it becomes a thing preferable on pedestrian protection.

A preferred mode based on the above solution is as described in claim 2 and the following. That is,
The upper fascia is an inclined part whose front part is inclined toward the front lower side,
The high-rigidity part is disposed along the inclined part below the inclined part.
(Corresponding to claim 2). In this case, it is preferable to firmly receive the downward load applied to the upper facer at the time of a forward collision by the reinforcing member.

  The predetermined position is set in the vicinity of the rear end of the inclined portion and at a position ahead of the rear end of the inclined portion (corresponding to claim 3). In this case, the collision load is effectively transmitted to the rear part of the reinforcing member that is the low-rigidity part while firmly receiving the collision load that is directed rearward and downward at the front part that is the high-rigidity part of the reinforcing member. Is preferable.

The rear part of the upper fascia is a rear extension part extending substantially horizontally below the bonnet with a step difference downward from the inclined part,
The low-rigidity portion extends substantially horizontally below the rearward extending portion;
(Corresponding to claim 4). In this case, the collision load of the reinforcing member can be sufficiently received before the collision load is input to the bonnet, which is preferable for preventing or suppressing the deformation of the bonnet that is expensive due to the large member.

  The high-rigidity portion extends in the front-rear direction and has a plurality of front vertical rib portions arranged at intervals in the vehicle width direction, and an X-shaped oblique rib that connects the adjacent front vertical rib portions from an oblique direction. A rib structure having a portion (corresponding to claim 5). In this case, the rib structure can be used to achieve a highly rigid portion while reducing the weight as much as possible.

In addition to the front longitudinal rib portion and the oblique rib portion, the high-rigidity portion has a plurality of front lateral rib portions extending in the vehicle width direction at intervals in the front-rear direction,
The front longitudinal rib portion connects the plurality of front transverse rib portions,
The oblique rib portion is formed for each region defined by the front vertical rib portion and the front horizontal rib portion.
(Corresponding to claim 6). In this case, the rigidity of the front portion of the reinforcing member can be sufficiently increased by utilizing the lateral rib portion.

The low rigidity portion has a rear longitudinal rib portion extending in the front-rear direction,
The rear vertical rib portion is continuous with the rear end of the front vertical rib portion.
(Corresponding to claim 7). In this case, it is preferable for effectively transmitting the collision load input to the front portion of the reinforcing member to the rear portion of the reinforcing member.

The upper end portion of the bumper fascia has a vertical wall portion extending in the vertical direction and a rearward extending portion extending substantially horizontally from the upper end of the vertical wall portion to the rear,
A bent portion serving as a boundary between the vertical wall portion and the rearward extending portion of the bumper fascia is located between a front end of the reinforcing member and the predetermined position;
This is done (corresponding to claim 8). In this case, there is a front part that is a highly rigid part of the reinforcing member up to the front position of the vertical wall part of the bumper fascia to prevent or suppress the situation where the bumper fascia (especially the upper end part) is deformed by the collision load. This is preferable.

  According to the present invention, it is possible to satisfy both the impact mitigation at the time of a forward collision and the securing of rigidity near the upper facer at a high level.

The perspective view which shows the assembly state of a bumper fascia and an upper fascia. The perspective view of an upper fascia. The perspective view of a bumper fascia. The perspective view which shows a radiator shroud and a shroud upper member. The perspective view which shows the state which assembled | attached the bumper fascia to the assembly shown in FIG. The perspective view which shows the state which assembled | attached the reinforcement member to the assembly shown in FIG. The back view which looked at the reinforcement member from the lower part. The principal part enlarged view which shows the rib structure formed in the back surface of a reinforcement member. Side surface sectional drawing in the part containing a reinforcement member.

  In FIG. 1, 10 is a bumper facer, and 20 is an upper facer. The bumper facer 10 and the upper facer 20 constitute an outer surface of the vehicle front end. A single state of the bumper facer 10 is shown in FIG. 3, and a single state of the upper facer 20 is shown in FIG. The bumper facer 10 and the upper facer 20 are formed thin with synthetic resin.

  As shown in FIG. 9, the upper facer 20 is positioned in front of the bonnet 1 and covers the upper end of the bumper facer 10 from above. The upper fascia 20 is formed as an inclined portion 21 whose front end portion is inclined forwardly downward, and extends rearwardly from the rear end of the inclined portion 21 and then extends downward to the bonnet 1. Part 22 is designated. The rear end of the inclined portion 21 of the upper facer 20 is continuous with the front end of the bonnet 1.

  FIG. 4 shows a radiator shroud 2 as a vehicle body strength member, and a shroud upper member 3 as a vehicle body strength member integrated at the upper end thereof. The radiator shroud 2 is disposed between a pair of left and right front frames (not shown), and the lower end portion of the radiator shroud 2 is connected to the pair of left and right front frames via a connecting bracket (not shown). The shroud door member 3 extends in the vehicle width direction, and each end thereof is connected to a front end of an apron rain (not shown).

  The bumper fascia 10 has a large grill opening 11 for taking in the traveling wind at the center thereof (in particular, see FIG. 3), and a grill member 12 (see FIG. 1) is disposed in the grill opening 11. Yes. The upper end portion of the bumper fascia 10 has a vertical wall portion 13 serving as an upper edge portion of the opening portion 11, and a rear extending portion 14 extending substantially horizontally rearward from the upper end of the vertical wall portion 13. . As shown in FIG. 9, the rear end portion of the rearward extending portion 14 is fixed to the shroud upper member 3 by a fixing tool 15. The shroud door member 3 is connected to a rear extending portion 22 of the upper fascia 20 via an attachment stay (not shown) extending in the front-rear direction. Note that the end of the upper fascia 20 in the vehicle width direction is connected to the apron rain.

  A reinforcing member 30 extending in the front-rear direction is disposed between (a space in between) the bumper facer 10 and the upper facer 20. The reinforcing member 30 is formed of a synthetic resin into a shape as shown in FIGS.

  As shown in FIG. 9, the reinforcing member 30 has a rear portion 31 that extends substantially horizontally and a front portion 32 that is forwardly lowered. The front part 32 inclined forward and downward is arranged along the inclined part 21 of the upper fascia 20. The reinforcing member 30 has a rear extending portion 33 that extends further rearward from the rear of the rear portion 31, and the rear extending portion 33 is fixed to the shroud upper member 3 by the fixing tool 15 described above ( Fasten with Bumper Faisha 10).

  Among the reinforcing members 30, the rear portion 31 is a low-rigidity portion, while the front portion 32 is a high-rigidity portion that is higher in rigidity than the rear end portion 31. A predetermined position serving as a boundary between the rear portion 31 (low-rigidity portion) and the front portion 32 is indicated by a symbol α in FIGS. The front-rear direction position of the predetermined position α is set in front of the rear end of the inclined portion 21 of the upper fascia 20 and in the vicinity of the inclined portion 21.

  As will be described later, a rib structure is formed on the back side of the reinforcing member 30. In the embodiment, the rib structure is differentiated between the rear portion 31 and the front portion 32, so that the low-rigidity portion and the high-rigidity portion described above are different. Settings have been made.

  The rib structure formed in the reinforcing member 30 will be described with reference to FIGS. First, a plurality of lateral rib portions 35 extending in the vehicle width direction are formed on the back surface side of the reinforcing member 30 so as to protrude in the front-rear direction. Among the lateral rib portions 35, the front lateral rib portion positioned in front of the predetermined position α is denoted by reference numeral 35a, and the lateral rib portion positioned behind the predetermined position α is defined as the rear lateral rib portion 35b. In the embodiment, the lateral rib portion is located at the predetermined position α, but this is shown as the front lateral rib portion 35a.

  A plurality of vertical rib portions 36 extending in the front-rear direction are formed on the back surface of the reinforcing member 30 at intervals in the vehicle width direction. A front vertical rib portion positioned forward of the predetermined position α in the vertical rib portion 35 is indicated by reference numeral 36a, and a rear vertical rib portion positioned rearward of the predetermined position α is indicated by reference numeral 36b. The front vertical rib portion 36a and the rear vertical rib portion 36b are connected so as to be in a straight line.

  An oblique rib portion 37 is formed on the back surface side of the reinforcing member 30 in order to further increase the rigidity of the front portion with respect to the predetermined position α as compared with the rear portion. The oblique rib portion 37 is formed in an X shape and obliquely connects adjacent front longitudinal rib portions 36a. That is, of the adjacent front longitudinal rib portions 36 a, one front end portion and the other rear end portion are connected by the oblique rib portion 37.

  As shown in FIG. 9, the reinforcing member 30 has a predetermined position α (the rear end position of the front portion 32 that is a highly rigid portion) positioned above the rearward extending portion 14 in the bumper fascia 10. Further, the front end of the reinforcing member 30 is positioned in front of the vertical wall portion 13 (the front end of the rearward extending portion 14) in the bumper facer 10 and is positioned in the vicinity of the front end of the upper facer 20. The front end of the bonnet 1 is positioned approximately in the front-rear direction of the rear portion 31 that is the low-rigidity portion of the reinforcing member 30 and is substantially in the same position as the front end position of the bumper reinforcement 4. . This bumper reinforcement is connected to the front end of the front frame.

  In the configuration as described above, when the vehicle collides with a front obstacle (especially a pedestrian) (light collision), a load of lowering forward acts on the upper fascia 20. In this case, a situation in which the collision load is received by the front end portion 32 which is a highly rigid portion of the reinforcing member 30 and the upper end portions of the upper fascia 20 and the bumper fascia 10 are largely deformed is prevented or suppressed. It is possible to prevent or suppress deformation and breakage of the devices disposed on the rear side. While the upper faucet 20 has the inclined portion 21 that is lowered forward, the front end portion 32 that is a highly rigid portion in the reinforcing member 30 is also lowered forward along the inclined portion 21, so that the collision load is firmly secured by the reinforcing member 30. I can take it.

  When the collision load from the front obstacle increases, the front end portion 32 of the reinforcing member 30 absorbs the collision load while being deformed downward with the predetermined position α as a boundary, and the rear end portion 31 formed as a low rigidity portion is deformed. (Especially in the front-rear direction deformation), the collision load is absorbed more effectively. Thereby, it becomes a thing preferable also on pedestrian protection in the case where the collided front obstacle is a pedestrian. When the collision load increases, the reinforcing member 30 may absorb the impact by being broken at the predetermined position α.

  Although the embodiments have been described above, the present invention is not limited to the embodiments, and appropriate modifications can be made within the scope of the claims. In order to make the rigidity different between the rear end portion 31 and the front end portion 32 of the reinforcing member 30 using the rib structure, in addition to using the oblique rib portion 37, the number, thickness, and height of the front and rear rib portions are increased. 1 or two or more of them can be made different, and instead of or in addition to using the rib portion, between the rear end portion 31 and the front end portion 32 of the reinforcing member 30. It can also be performed by changing the wall thickness. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention is suitable as a front structure of a vehicle.

α: predetermined position 1: bonnet 2: radiator shroud 3: shroud upper member 4: bumper reinforcement 10: bumper fascia 13: vertical wall part 14: rearward extension part 15: fixing tool 20: upper fascia 21: inclined part 22 : Rear extension part 30: Reinforcing member 31: Rear end part (low rigidity part)
32: Front end (high rigidity part)
33: Rear extending portion 35: Horizontal rib portion 35a: Front horizontal rib portion 35b: Rear horizontal rib portion 36: Vertical rib portion 36a: Front vertical rib portion 36b: Rear vertical rib portion 37: Diagonal rib portion

Claims (8)

The front structure of the vehicle is configured to cover the upper end of the bumper fascia with an upper fascia,
Between the bumper facer and the upper facer, a reinforcing member extending in the front-rear direction is disposed,
The reinforcing member is formed so that the front portion is a high-rigidity portion and the rear portion is a low-rigidity portion with a predetermined position in the front-rear direction as a boundary.
A vehicle front body structure characterized by that. In claim 1,
The upper fascia is an inclined part whose front part is inclined toward the front lower side,
The high-rigidity part is disposed along the inclined part below the inclined part.
A vehicle front body structure characterized by that. In claim 1 or claim 2,
The vehicle body structure for a front part of a vehicle, wherein the predetermined position is set near a rear end of the inclined portion and forward of a rear end of the inclined portion. In claim 3,
The rear part of the upper fascia is a rear extension part extending substantially horizontally below the bonnet with a step difference downward from the inclined part,
The low-rigidity portion extends substantially horizontally below the rearward extending portion;
A vehicle front body structure characterized by that. In any one of Claims 1 thru | or 4,
The high-rigidity portion extends in the front-rear direction and has a plurality of front vertical rib portions that are arranged at intervals in the vehicle width direction, and an X-shaped oblique rib that connects the adjacent front vertical rib portions from an oblique direction. A vehicle body structure for a front portion of a vehicle, characterized in that the structure is a rib structure having a portion. In claim 5,
In addition to the front longitudinal rib portion and the oblique rib portion, the high-rigidity portion has a plurality of front lateral rib portions extending in the vehicle width direction at intervals in the front-rear direction,
The front longitudinal rib portion connects the plurality of front transverse rib portions,
The oblique rib portion is formed for each region defined by the front vertical rib portion and the front horizontal rib portion.
A vehicle front body structure characterized by that. In claim 5 or claim 6,
The low rigidity portion has a rear longitudinal rib portion extending in the front-rear direction,
The rear vertical rib portion is continuous with the rear end of the front vertical rib portion.
A vehicle front body structure characterized by that. In any one of Claims 1 thru | or 7,
The upper end portion of the bumper fascia has a vertical wall portion extending in the vertical direction and a rearward extending portion extending substantially horizontally from the upper end of the vertical wall portion to the rear,
A bent portion serving as a boundary between the vertical wall portion and the rearward extending portion of the bumper fascia is located between a front end of the reinforcing member and the predetermined position;
A vehicle front body structure characterized by that.

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