JP2010000972A - Front body structure of vehicle - Google Patents

Abstract

[PROBLEMS] To ensure the repairability of a cooling unit during a light collision and to effectively absorb collision energy during a high-speed collision.
Both ends of a shroud door upper portion 9 extending in the vehicle width direction are connected to apron reinforcements 3 on both vehicle sides. The shroud 5 is configured by integrally connecting the frame-shaped shroud drawer portion 11 that houses and holds the cooling unit 37 to the shroud upper portion 9. The bumper reinforcement 7 that receives the impact at the time of a light collision from the front of the vehicle collides with the shroud drawer part 11, thereby separating the shroud drawer part 11 from the shroud upper part 9. The shroud door upper portion 9 is deformed by an impact acting at the time of a high-speed collision from the front of the vehicle to absorb the collision energy.
[Selection] Figure 1

Description

  The present invention relates to an improvement in a vehicle body front portion structure including a shroud having a frame-shaped shroud drawer portion that accommodates and holds a cooling unit inside, and particularly relates to a countermeasure against a collision.

  Patent Document 1 discloses a vehicle body front structure in which a shroud that accommodates and holds a cooling unit inside is connected and supported to front side frames on both sides of the vehicle.

In such a structure, when the bumper reinforcement retreats and collides against the shroud when the vehicle collides head-on, the cooling unit is damaged. Therefore, in Patent Document 1, the shroud is attached to the bumper rain. By separating from the front side frame due to the collision of the force and moving backward, or by connecting the shroud and the front side frame by bending and deforming due to the collision of the bumper reinforcement, the collision energy is absorbed and the shock is absorbed. Mitigating and ensuring repairability by preventing damage to the cooling unit.
JP 2002-240744 (5th page, 6th page, FIG. 2, FIG. 5)

  By the way, at the time of high-speed collision from the front of the vehicle, a very large impact acts on the front portion of the vehicle body. Therefore, it is desirable to take measures to alleviate this impact.

  For example, since the impact from the front of the vehicle greatly affects the shroud located at the center of the front of the vehicle body, it is conceivable that the shroud can absorb the collision energy at the time of high-speed collision.

  However, the shroud separation and the bending deformation of the shroud connecting portion according to the above-mentioned Patent Document 1 are effective at the time of a light collision, but the shroud that retreats by an impact at the time of a high-speed collision is efficiently used by a front side frame that is a vehicle body rigid member. I can't get well. When the rigidity of the shroud is increased and the shroud is rigidly connected to the front side frame, the impact during high-speed collision can be efficiently transmitted to the front side frame, but it is held by the shroud even during light collision. The cooling unit is directly impacted and damaged.

  The present invention has been made in view of the above points, and an object of the invention is to ensure the repairability of the cooling unit at the time of a light collision and to effectively absorb the collision energy at the time of a high-speed collision. .

  In order to achieve the above object, the present invention is characterized in that the collision energy is absorbed in two stages. Specifically, the following solution is taken.

  In other words, the invention according to claim 1 is provided such that a shroud door upper part extending in the vehicle width direction in which both ends in the vehicle width direction are connected to the vehicle body rigid members on both sides of the vehicle, and the shroud door upper part are integrally connected to the cooling unit. A shroud composed of a frame-shaped shroud drawer part that is accommodated and held inside, and the shroud drawer part is separated from the shroud door upper part by a bumper reinforcement that receives the impact during a light collision from the front of the vehicle. The shroud upper part is configured to be deformed by an impact acting at the time of high-speed collision from the front of the vehicle and absorb collision energy.

  According to a second aspect of the present invention, both ends in the vehicle width direction are bifurcated into a first branch portion and a second branch portion, and the first branch portion is connected to a vehicle body rigid member on both sides of the vehicle. A shroud door upper portion extending in the vehicle width direction facing the vehicle rigid member in front of the vehicle body rigid member at a predetermined interval, and a frame-shaped shroud that is integrally connected to the shroud door upper portion and accommodates and holds the cooling unit inside. A shroud comprising a lower portion, and the shroud upper portion breaks the first bifurcation portion when a bumper reinforcement that receives the impact during a light collision from the front of the vehicle collides with the shroud drawer portion. The second bifurcated portion is separated from the vehicle body rigid member and changes when the second bifurcated portion collides with the vehicle body rigid member due to an impact that occurs during a high-speed collision from the front of the vehicle. Characterized in that it is configured to absorb the collision energy by.

  According to the first aspect of the present invention, when the frontal collision of the vehicle is a light collision, the bumper reinforcement receives the impact and collides with the shroud drawer part, and the shroud drawer part is separated from the shroud upper part. Retreat, the impact energy is absorbed, and the impact acting on the shroud drawer is alleviated. Therefore, breakage of the shroud drawer part is prevented, damage to the cooling unit held by the shroud drawer part is also prevented, and repair reliability is ensured.

  On the other hand, when the frontal collision of the vehicle is a high-speed collision, a large impact acts on the shroud upper part. At this time, since both ends in the vehicle width direction of the shroud upper part are connected to the vehicle body rigid members on both sides of the vehicle, the shroud upper part is deformed by receiving the large impact from the front, and the collision energy is absorbed to reduce the impact. .

  According to the invention of claim 2, when the frontal collision of the vehicle is a light collision, the bumper reinforcement receives the impact and collides with the shroud drawer part. The impact is transmitted to the shroud upper part, the first bifurcation at both ends in the vehicle width direction breaks, the shroud upper part acting on the shroud drawer part is separated from the rigid body member, the entire shroud retracts, and the collision energy is absorbed The shock is relieved. Therefore, breakage of the shroud drawer part is prevented, damage to the cooling unit held by the shroud drawer part is also prevented, and repair reliability is ensured.

  On the other hand, when the frontal collision of the vehicle is a high-speed collision, a large impact acts on the shroud upper part. At this time, the second branch portions on both ends in the vehicle width direction collide with the vehicle rigid member from the front of the vehicle, and the shroud door upper portion receives the large impact from the front and deforms, absorbing the impact energy and reducing the impact. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 and 2 show a vehicle body front part structure according to Embodiment 1 of the present invention. In the figure, 1 is a pair of front side frames (vehicle body rigid members) extending in the vehicle longitudinal direction on both sides of the vehicle, and 3 is a pair of apron reinforcements extending in the vehicle longitudinal direction above each front side frame 1. (Body rigidity member). A shroud 5 is disposed between the front ends of the front side frames 1, and a bumper reinforcement 7 is disposed close to the front of the shroud 5 so as to extend in the vehicle width direction.

  3, 4 and 6, the shroud 5 is made of a metal shroud door upper portion 9 having a substantially U-shaped cross section that is curved in a substantially arcuate shape and extends in the vehicle width direction, and a rectangular frame-shaped resin. It consists of a shroud drawer part 11, the surface of the shroud upper part 9 is partially covered with a resin layer 13, and resin ribs 15 are formed in a lattice shape on the back surface. Further, a hooking device 17 for hooking a hooking device (not shown) of a bonnet is attached to the front of the shroud door upper portion 9 in the vehicle width direction, and is attached to both ends of the shroud door upper portion 9 in the vehicle width direction. The bolt insertion hole 9a is formed to penetrate in the vertical direction. On the other hand, a bolt insertion hole 3a is formed at the front end of the apron reinforcement 3 in the vertical direction so that the front end of the apron reinforcement 3 is inserted at both ends of the shroud door upper portion 9 in the vehicle width direction. 19 is inserted into the bolt insertion holes 9a and 3a from above and nuts 21 are screwed into shafts protruding downward, so that both ends of the shroud door upper portion 9 in the vehicle width direction are the vehicle front ends of both apron reinforcements 3. (Refer to FIG. 2 and FIG. 7). Thereby, the shroud upper part 9 receives a large impact acting at the time of high-speed collision from the front of the vehicle and deforms from the front, absorbs the impact energy, and relieves the impact.

  On the other hand, the shroud drawer portion 11 is composed of an upper frame 23, a lower frame 25, and both side frames 27, and the shroud door upper portion 9 extends over a region in which the middle of the upper frame 23 in the vehicle width direction is approximately one third. Thus, the shroud drawer portion 11 is integrally connected to the shroud door upper portion 9. The connecting portion has a narrower width in the vehicle front-rear direction than the both side portions (see FIGS. 4 and 7). Further, both end sides in the vehicle width direction of the shroud door upper portion 9 extend laterally from the shroud drawer portion 11, and a headlamp (not shown) is attached to the extended portion. Further, U-shaped grooves 29 are formed from the upper surface part to the front part at both ends of the upper frame 23 where the shroud door upper part 9 is connected, and the vertical dimension of the front part corresponding to the groove 29 is shortened. Thus, the weak part 31 is weaker in strength than the other part. As a result, the shroud drawer portion 11 is separated from the shroud door upper portion 9 by breaking the fragile portion 31 due to the collision of the bumper reinforcement 7 that received the impact at the time of a light collision from the front of the vehicle. The impact which acts on the shroud drawer part 11 by absorbing energy is mitigated.

  Further, pin insertion holes 23a (see FIG. 6) are formed in the up-down direction near both ends of the upper frame 23 in the vehicle width direction, and pin insertion is also performed near both ends of the lower frame 25 in the vehicle width direction. A hole 25a (see FIG. 4) is formed penetrating in the vertical direction. Further, the two side frames 27 are formed with two bolt insertion holes 27a (see FIGS. 1 to 4) penetrating at intervals in the vertical direction.

  In the shroud drawer portion 11, a cooling unit 37 including a radiator 33 and a cooler condenser 35 is accommodated and held inside. Specifically, mounting pins 39 (see FIG. 3 and FIG. 6) protrude upward from both ends of the upper surface of the radiator 33 in the vehicle width direction, and close to both ends of the lower surface of the radiator 33 in the vehicle width direction. Also, mounting pins 39 (see FIG. 3) project downward, and these mounting pins 39 are inserted into the respective pin insertion holes 23a, 25a of the upper frame 23 and the lower frame 25 to connect the annular mount rubber 41 to the mounting pins. The radiator 33 is accommodated and held in the shroud drawer section 11 by being fitted to 39. In FIG. 1, the mounting pin 39 is omitted. Further, as shown in FIG. 6, the cooler condenser 35 is attached to the radiator 33 by a mounting bracket 43 so as to approach the front of the vehicle, and is accommodated and held in the shroud drawer portion 11 via the radiator 33.

  As shown in FIG. 5, crash pipes 45 that are crushed by an impact from the front of the vehicle are attached to both ends of the bumper reinforcement 7 in the vehicle width direction. The crash pipes 45 extend inward in the vehicle width direction. A base portion 47b of the mounting plate 47 having the extending portion 47a is fixed, and four bolt insertion holes 47c are formed through the base portion 47b. On the other hand, a mounting plate 49 is also fixed to the front end of each front side frame 1 and four bolt insertion holes 49a are formed through the mounting plate 49 so that the mounting plates 47 and 49 are in contact with each other. The bolt 51 is inserted into the bolt insertion holes 47c and 49a and the shaft portion is screwed into the nut 53 (see FIG. 7), so that both ends of the bumper reinforcement 7 in the vehicle width direction are connected via the crush tube 45. The both front side frames 1 are connected to the vehicle front ends. In addition, two bolt insertion holes 47d are formed at the end of the extending portion 47a of the mounting plate 47 at intervals in the vertical direction, and the ends of the extending portion 47a are connected to both side frames 27 of the shroud drawer portion 11. The bolt 55 is inserted into the bolt insertion hole 47d of the extension portion 47a and the bolt insertion hole 27a of the side frame 27 with the shaft portion being fitted to the nut 57 (FIG. The shroud drawer portion 11 is connected to the vehicle front ends of the front side frames 1 via the mounting plate 47 by being screwed to each other. In FIG. 5, 59 is a bumper face. Thus, when the bumper reinforcement 7 receives the impact at the time of a light collision from the front of the vehicle, the bumper reinforcement 7 moves backward while crushed the crash pipes 45 at both ends in the vehicle width direction, and the both mounting plates The extension 47a collides with the distal end of the extended portion 47a (the side frame 27 of the shroud drawer portion 11), and the extended portion 47a is bent and deformed backward from the base, and the shroud drawer is deformed by the deformation of the extended portion 47a. The portion 11 moves to the rear of the vehicle, and the fragile portion 31 is broken (see FIGS. 7A and 7B).

  As described above, in the first embodiment, when the frontal collision of the vehicle is a light collision, the fragile portion 31 of the shroud drawer portion 11 is broken as described above, and the connection portion with the shroud door upper portion 9 of the upper frame 23 is left. Since the shroud drawer part 11 is separated from the shroud upper part 9 and moves backward in the vehicle, the impact acting on the shroud drawer part 11 can be reduced by absorbing the collision energy by the backward movement. Thereby, the shroud drawer part 11 is not damaged, and the cooling unit 37 held by the shroud drawer part 11 is not damaged, so that repairability of the cooling unit 37 can be ensured.

  In the first embodiment, when the frontal collision of the vehicle is a high-speed collision, both ends in the vehicle width direction of the shroud upper part 9 are connected to the vehicle front end of the apron reinforcement 3 on both sides of the vehicle. The portion 9 is deformed by receiving a large impact from the front, and the deformation can absorb the impact energy and mitigate the impact.

(Embodiment 2)
8 and 9 show a vehicle body front part structure according to the second embodiment. The second embodiment is the same as the first embodiment except that the following (1) to (5) are different from the first embodiment. Therefore, only different points will be described below, and the same components will be described in the embodiment. It will be left to the description of 1 and the drawings. In FIG. 9, the hooked portion 17 is omitted.

<Differences from Embodiment 1>
(1) The vehicle front end of the front side frame 1 and the vehicle front end of the apron reinforcement 3 are connected by a connection bracket 61, and these three members constitute a vehicle rigid member.

  (2) The shroud door upper portion 9 has a linear shape, no headlamp mounting portion, and both the vehicle width direction ends overlap the vehicle front ends of both front side frames 1 from above. Both ends of the shroud door upper portion 9 in the vehicle width direction are connected to the vehicle front ends of both apron reinforcements 3 by screwing nuts into shaft portions that are inserted through the insertion holes 9a and 3a and project downward. .

  (3) The shroud door upper portion 9 and the upper frame 23 of the shroud drawer portion 11 are connected by a resin connecting portion 63 over the entire vehicle width direction, and a substantially V-shape is provided between the connecting portion 63 and the upper frame 23. A groove 29 is formed in the entire vehicle width direction, and the portion constitutes a fragile portion 31 that is weaker in strength than other portions.

  (4) The cooler condenser 35 is disposed behind the radiator 33 in the vehicle.

  (5) Mounting brackets 65 having bolt insertion holes 65a are fixed to both ends of the bumper reinforcement 7 in the vehicle width direction, and the mounting brackets 65 are supported from the front of the vehicle in the middle of the side frames 27 of the shroud drawer portion 11 in the vertical direction. In this state, the bolt 55 is inserted into the bolt insertion hole 65a of the mounting bracket 65 and the bolt insertion hole 27a of the side frame 27, and the shaft portion is screwed into a nut (not shown), so that the shroud drawer The part 11 is connected to the vehicle front ends of both front side frames 1 via a mounting bracket 65, a bumper reinforcement 7, a crash tube 45 and a mounting plate 47. Therefore, the mounting plate 47 does not have the extending portion 47a as in the first embodiment.

  In the second embodiment, when the frontal collision of the vehicle is a light collision, the fragile part 31 in the connecting part 63 between the shroud upper part 9 and the upper frame 23 of the shroud drawer part 11 is broken, and the shroud drawer part 11 is separated from the shroud upper part 9 and retracts to the rear of the vehicle. Therefore, the impact acting on the shroud drawer portion 11 by absorbing the collision energy can be mitigated by this backward movement operation. Thereby, the shroud drawer part 11 is not damaged, and the cooling unit 37 held by the shroud drawer part 11 is not damaged, so that repairability of the cooling unit 37 can be ensured.

  In the second embodiment, when the frontal collision of the vehicle is a high-speed collision, both ends in the vehicle width direction of the shroud upper part 9 are connected to the vehicle front end of the apron reinforcement 3 on both sides of the vehicle. The portion 9 is deformed by receiving a large impact from the front, and the deformation can absorb the impact energy and mitigate the impact. At this time, since the large impact is distributed to the front side frame 1 through the connection bracket 61, damage due to the impact on the shroud upper portion 9 is reduced.

(Embodiment 3)
10 to 13 show a vehicle body front structure of a vehicle according to the third embodiment. In the third embodiment, the points (1), (4), and (5) are the same as those in the second embodiment. Further, the above (2) and (3) are different from the second embodiment, and further, the following (6) and (7) are different from the first and second embodiments. The rest is the same as in the first and second embodiments, and therefore only different points will be described below, and the same components will be left to the description of the first and second embodiments and the drawings.

<Differences from Embodiments 1 and 2>
(6) The shroud upper part 9 is a metal rectangular annular first frame part 67 formed in a linear shape, and a substantially U-shaped resin second formed integrally on the rear surface of the first frame part 67. The second frame portion 69 is integrally formed with a U-shaped resin shroud drawer portion 11. The second frame part 69 is formed integrally with the shroud drawer part 11 when the shroud drawer part 11 is molded. The second frame part 69 is as if the shroud drawer part 11 is rectangular and part thereof. It seems that is composed.

  (7) Both ends in the vehicle width direction of the shroud upper portion 9 are bifurcated into the first branch portion 71 and the second branch portion 73 in the vertical direction. Specifically, the first branch portion 71 is formed by portions bent at right angles to the rear of the vehicle at both ends in the vehicle width direction of the second frame portion 69 and has bolt insertion holes 71a. With the bolts 19 inserted from above into the bolt insertion holes 71a, 3a, and the nuts 21 being screwed into the shafts protruding downward. Thus, both ends in the vehicle width direction of the second frame portion 69 are connected to the vehicle front ends of both apron reinforcements 3 (see FIG. 12). Moreover, the substantially V-shaped groove | channel 29 is formed in the base end of the 1st branch part 71, and the said location comprises the weak part 31 stronger in intensity than another location. The second branch portion 73 is formed by portions bent at right angles to the rear of the vehicle at both ends in the vehicle width direction of the first frame portion 67, and the second branch portion 73 is spaced a predetermined distance from the front of the connection bracket 61 in the vehicle. Are confronting each other.

  In the third embodiment, when the frontal collision of the vehicle is a light collision, the bumper reinforcement 7 receives the impact and collides with the shroud drawer portion 11, and the impact is transmitted to the shroud door upper portion 9 and the second frame. The weak part 31 in the first branch part 71 of the part 69 is broken, and the shroud upper part 9 (second frame part 69) is separated from the apron reinforcement 3 so that the entire shroud 5 is retracted. Therefore, the impact acting on the shroud drawer portion 11 by absorbing the collision energy can be mitigated by this backward movement operation. Thereby, the shroud drawer part 11 is not damaged, and the cooling unit 37 held by the shroud drawer part 11 is not damaged, so that repairability of the cooling unit 37 can be ensured.

  Further, in the third embodiment, when the frontal collision of the vehicle is a high-speed collision, the both ends in the vehicle width direction of the shroud upper part 9 (first frame part 67) are opposed to the connection bracket 61 from the front of the vehicle. The portion 9 is moved backward with a large impact acting at the time of a high-speed collision, the second branch portion 73 collides with the connection bracket 61 from the front of the vehicle, and the shroud door upper portion 9 receives a large impact from the front and deforms. This deformation can absorb the impact energy and mitigate the impact. At this time, since the large impact is distributed to the front side frame 1 through the connecting portion 63, damage due to the impact on the shroud upper portion 9 is reduced.

  The present invention is useful for a vehicle body front portion structure including a shroud having a frame-shaped shroud drawer portion that accommodates and holds a cooling unit inside.

1 is an exploded perspective view of a vehicle body front part structure according to Embodiment 1. FIG. 1 is an assembled perspective view of a vehicle body front part structure according to Embodiment 1. FIG. FIG. 3 is a front view of the shroud in the first embodiment. It is the perspective view which looked at the shroud in Embodiment 1 from the back side. It is a cross-sectional plan view which expands and shows the A section of FIG. It is sectional drawing in the VI-VI line of FIG. (A) is a view taken in the direction of arrow B in FIG. 2, and (b) is a diagram corresponding to FIG. 7 (a) showing a state in which the shroud drawer part is retracted during a light collision. FIG. 3 is a diagram corresponding to FIG. It is sectional drawing of the assembly state corresponding to the IX-IX line of FIG. FIG. 6 is a view corresponding to FIG. 1 of Embodiment 3. It is sectional drawing of the assembly state corresponding to the XI-XI line of FIG. 7A is a diagram corresponding to FIG. 7A, and FIG. 7B is a diagram corresponding to FIG. (A) is a plan view of FIG. 12 (a), and (b) is a plan view of FIG. 12 (b).

Explanation of symbols

1 Front side frame (body rigidity member)
3 Apron reinforcement (body rigidity member)
5 Shroud 7 Bumper reinforcement 9 Shroud upper part 11 Shroud drawer part 37 Cooling unit 61 Connecting bracket (body rigidity member)
71 1st branch part 73 2nd branch part

Claims (2)

A shroud door upper portion extending in the vehicle width direction in which both ends in the vehicle width direction are connected to the vehicle body rigid members on both sides of the vehicle,
A shroud that is integrally connected to the shroud door upper part and includes a frame-like shroud drawer part that accommodates and holds the cooling unit inside;
The shroud drawer part is separated from the shroud upper part by the bumper reinforcement that received the impact at the time of a light collision from the front of the vehicle,
The vehicle body front structure according to claim 1, wherein the shroud upper portion is configured to be deformed by an impact acting at the time of high-speed collision from the front of the vehicle to absorb collision energy. Both ends in the vehicle width direction are bifurcated into a first branch portion and a second branch portion, the first branch portion is connected to a vehicle body rigid member on both sides of the vehicle, and the second branch portion is a vehicle of the vehicle body rigid member. A shroud door upper portion extending in the vehicle width direction facing the front with a predetermined interval;
A shroud that is integrally connected to the shroud door upper part and includes a frame-like shroud drawer part that accommodates and holds the cooling unit inside;
The shroud upper part is separated from the vehicle body rigid member when the bumper reinforcement that received the impact at the time of a light collision from the front of the vehicle collides with the shroud drawer part and the first branch part is broken and separated from the vehicle body rigid member. A vehicle body front structure, wherein the second branch portion is deformed by a collision with a vehicle body rigid member due to an impact acting during a high-speed collision from the vehicle to absorb collision energy.

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