JP2009040389A - Front structure of vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently absorb an impact load in collision with a vehicle by using a front side member. <P>SOLUTION: In this front structure of a vehicle body, a front side member 10 inside of an engine room Er is bent in a bending position 12 in collision with a vehicle and, further, bent in a bending position 13 so as to absorb an impact load in collision with the vehicle. An engine auxiliary machine 30, which is arranged in a position wherein a bent angular part 12k abuts on it when the front side member 10 is bent in the bending position 12, is provided with a stopper 34 for regulating movement of the bent angular part 12k in the back and forth direction of the vehicle. The stopper 34 is structured to restrict escape of the force to be applied to the bending position 13 of the front side member 10 by regulating movement of the bent angular part 12k in the back and forth direction of the vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle body front structure configured to absorb an impact load at the time of a vehicle front collision by bending a front side member in an engine room at a planned bending position at a vehicle front collision and further bending at a planned bending position.

With respect to the vehicle body front structure, for example, various proposals have been made to protect the driver by absorbing an impact load with a front side member at the time of a vehicle front collision.
For example, the vehicle body front part structure described in Patent Document 1 is configured such that a fragile part is provided at a predetermined position of a front side member in an engine room, and the front side member is bent at the position of the fragile part at the time of a vehicle front collision. ing. Thereby, the impact load at the time of frontal collision of the vehicle is absorbed by the deformation of the front side member.

JP 2003-95132 A

However, in recent years, with an increase in the number of devices housed in the engine room, the free space in the engine room is reduced, and there is a case where a sufficient space for deformation of the front side member cannot be secured.
For example, in the case of the front side member 101 shown in FIG. 8 (A), the planned folding position 102 is folded into a Z shape when the vehicle is collided (see the solid line in FIG. 8 (B)), and the front folding corner 102e is Projecting outward, the rear bent corner 102k enters the inside of the engine room Er to absorb the impact load. Further, the impact load is absorbed when the planned bending position 103 is bent outward in a substantially square shape (see a two-dot chain line in FIG. 8B).
However, as shown in FIG. 8A, if the gap dimension S between the planned folding position 102 of the front side member 101 and the auxiliary equipment Ep of the engine E is small, the rear folding corner 102k when folded into a Z shape is obtained. Comes into contact with the auxiliary device Ep and cannot enter the engine room Er. As a result, the rear bent corner portion 102k of the front side member 101 slides forward on the surface of the auxiliary equipment Ep of the engine E by the impact load. That is, the force applied to the planned bending position 103 of the front side member 101 escapes forward, and the front side member 101 does not bend at the planned bending position 103 (see the solid line in FIG. 8B). Thereby, the impact load at the time of frontal collision of the vehicle is not efficiently absorbed by the front side member 101, and the influence on the passenger compartment side is increased.

  The present invention has been made to solve the above-described problems, and the problem to be solved by the present invention is to enable the front side member to efficiently absorb the impact load at the time of a vehicle front collision, and This is to minimize the influence of the vehicle front impact on the room side as much as possible.

The above-described problems are solved by the inventions of the claims.
The invention according to claim 1 is a vehicle body front structure configured to absorb an impact load at the time of a vehicle front collision by bending a front side member in an engine room at a planned bending position at a vehicle front collision and further bending at a planned bending position. In addition, when the front side member is folded at the planned folding position, the engine accessory in a position where the broken corner abuts restricts the broken corner from moving in the vehicle front-rear direction. A stopper is provided, and the stopper is configured to suppress the escape of the force applied to the planned bending position of the front side member by restricting the movement of the bent corner in the vehicle front-rear direction. It is characterized by that.

According to the present invention, the stopper provided in the engine accessory controls the front side member by restricting movement of the bent corner in the vehicle front-rear direction after the planned folding position of the front side member is folded. Suppresses the escape of force applied to the planned bending position. For this reason, after the front side member is bent at the planned folding position at the time of the frontal collision of the vehicle, the planned bending position of the front side member is surely bent. Therefore, the impact load at the time of the vehicle front collision is efficiently absorbed by the front side member in the engine room, and the influence at the time of the vehicle front collision on the vehicle compartment side can be minimized.
It should be noted that the “engine accessory” includes an engine support member, a support member of the device, and the like in addition to the device mounted on the engine.

According to the second aspect of the present invention, the planned folding position of the front side member is folded into a Z shape at the time of frontal collision of the vehicle, and the front bent corner portion is projected to the outside of the engine room when the bent into the Z shape. The part is inserted into the inside of the engine compartment, the planned bending position is provided behind the rear side corner, and the stopper is configured such that the rear side corner of the front side member moves forward. It is characterized by being able to regulate.
According to the invention of claim 3, the stopper is formed in the housing of the electric pump attached to the side surface of the engine.
According to the invention of claim 4, the stopper is formed in a housing of a compressor attached to the engine.

  According to the present invention, it becomes possible to efficiently absorb the impact at the time of collision by the front side member in the engine room at the time of vehicle front collision, and the influence at the time of vehicle front collision on the vehicle compartment side can be minimized.

[Embodiment 1]
Hereinafter, the vehicle body front structure according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. The vehicle body front structure according to the present embodiment relates to a structure that allows the front side member to efficiently absorb an impact load at the time of a frontal collision of the vehicle. Here, FIG. 1 is a side view and a plan view showing a front side member of an automobile, and FIGS. 2 and 3 are plan views showing a state in which the right front side member is bent at the time of a frontal collision of the automobile. FIG. 4 is a perspective view showing an electric pump used in a vehicle body front structure. FIG. 5 is a perspective view of the front side member of the automobile as viewed from below.
In addition, front and rear, right and left and up and down in the figure correspond to front and rear, left and right and up and down of the automobile.

<Overview of the vehicle front structure>
First, an outline of the front body structure of an automobile will be described with reference to FIGS. 1 (A) and 1 (B), FIG. Here, FIG. 1 (B) represents a plan view (a plan view of FIG. 1 (A)) of the right side portion in the engine room Er of the automobile.
As shown in FIG. 5, an engine room Er divided by a vehicle compartment 2 and a dash panel 3 is provided at the front portion of the body 1 of the automobile M, and the vehicle room front-rear direction is provided on the left and right sides of the engine room Er. A pair of front side members 10 extending is provided.
As shown in FIG. 1A, the front side member 10 extends substantially horizontally in the front-rear direction of the vehicle in the engine room Er, and the rear side along the dash panel 3 is low at the rear end position of the engine room Er. It is inclined to become. The rear end portion 10 b of the front side member 10 is connected to a floor under reinforcement 20 that extends in the vehicle front-rear direction at the lower floor of the passenger compartment 2.
As shown in FIG. 5, the front portions of the left and right front side members 10 are connected by a front cross member 22, and intermediate portions of the left and right front side members 10 are connected by a front suspension cross member 24. The engine E is mounted on the front cross member 22 and the front suspension cross member 24.

<Characteristics of the front body structure>
As shown in FIGS. 1B and 2A, the front side member 10 according to the present embodiment has a planned bending position 12 and a planned bending at lower strength than other parts, as shown in FIGS. Position 13 is provided. As shown in FIGS. 2B and 3, the planned folding position 12 is configured to be folded into a Z shape as shown in FIGS. 2B and 3, and the front folding corner 12 e when the vehicle is folded into the Z shape has an engine room. It protrudes to the outside of Er, and the rear bent corner 12k is configured to enter the inside of the engine room Er. Further, as shown in FIG. 2 (B), the planned bending position 13 is configured to bend into a substantially hemispherical shape so that it protrudes outside the engine room Er after the planned folding position 12 is bent into a Z shape. Yes.
In the engine room Er, the electric pump 30 of the engine E is disposed at substantially the same height position in the vicinity of the planned folding position 12 of the right front side member 10 (see FIG. 2A). For this reason, when the planned folding position 12 of the front side member 10 is folded into a Z shape at the time of frontal collision of the vehicle, in particular, at the time of an offset collision, the rear folding corner portion 12k (FIG. 2 (B), 3) comes into contact with the side surface of the electric pump 30 (the surface of the ceiling plate 32).

The electric pump 30 includes a hat-shaped housing 31 as shown in FIG. The housing 31 includes an upper rectangular portion 31u and a lower circular portion 31d, and is formed with a substantially constant depth. A flange portion 31 f is formed on the opening periphery of the housing 31. As shown in FIG. 4B and the like, the electric pump 30 is attached sideways to the right side surface of the engine E by bolting the flange portion 31f of the housing 31 to the right side surface of the engine E.
A stopper 34 is formed on the ceiling plate 32 of the housing 31 of the electric pump 30 at a portion constituting the surface of the circular portion 31d. As shown in FIG. 3, the stopper 34 is a member that restricts the rear bent corner 12 k of the front side member 10 from moving forward along the ceiling plate 32 of the housing 31. As shown in FIG. 4 (A), the stopper 34 is vertically provided on the surface of the ceiling plate 32, and the stopper wall 34w is also provided on the surface of the ceiling plate 32. It is comprised from three support walls 34s supported from the front side.

The stopper wall 34w is a band plate-like wall with which the rear bent corner 12k abuts the front side member 10, and the housing 31 is attached to the right side surface of the engine E as shown in FIG. Thus, the height direction (width direction) of the wall coincides with the vehicle left-right direction. Further, the direction in which the stopper wall 34w extends (the length direction of the wall) substantially coincides with the vehicle vertical direction. To be precise, the extending direction of the stopper wall 34w is inclined upward by about 9 ° with respect to the vertical line. For this reason, the wall surface of the stopper wall 34w is directed slightly rearward and upward.
The support wall 34s is formed such that the height direction (width direction) of the wall coincides with the left-right direction of the vehicle, and the extending direction (length direction) of the wall coincides with the vehicle front-rear direction. The support wall 34s is formed in a substantially right triangle shape in a side view so that a portion connected to the stopper wall 34w is the highest. Each support wall 34s supports the upper end portion, the lower end portion, and the center portion of the stopper wall 34w from the front side.
The stopper wall 34w is positioned slightly rearward of the center position of the ceiling plate 32 of the housing 31 in the vehicle front-rear direction. Further, on the surface of the ceiling plate 32 of the housing 31, a truncated cone-shaped protrusion 32 e is formed on the rear side of the central portion of the stopper wall 34 w so that the rear bent corner portion 12 k contacts the front side member 10.

<Operation of the front structure of the vehicle body at the time of frontal collision>
Next, the operation of the vehicle body front structure at the time of a front collision will be described.
For example, when an impact at the time of an offset collision is applied to the front right side of the body 1, as shown in FIG. 3, the planned folding position 12 of the right front side member 10 is folded into a Z shape. That is, the front bent corner portion 12e when bent into a Z-shape protrudes to the outside of the engine room Er, and the rear bent corner portion 12k enters the inside of the engine room Er. As a result, the rear bent corner 12k of the front side member 10 comes into contact with the protrusion 32e formed on the ceiling plate 32 of the housing 31 of the electric pump 30, and is further hung on the stopper 34. As described above, the rear bent corner portion 12k of the front side member 10 is hooked on the stopper 34, so that the rear bent corner portion 12k of the front side member 10 cannot move forward along the ceiling plate 32 of the housing 31. That is, since the rear bent corner portion 12k of the front side member 10 is supported from the front side by the stopper 34, the bending force applied to the planned bending position 13 of the front side member 10 does not escape forward, as shown in FIG. As shown, the planned bending position 13 is surely bent into a substantially square shape.
Thereby, the impact at the time of an offset collision is efficiently absorbed by the front side member 10, and the influence at the time of the vehicle front collision given to the vehicle compartment 2 side can be minimized.

<Advantages of the vehicle body front structure according to the present embodiment>
According to the vehicle body front part structure according to the present embodiment, the stopper 34 provided on the electric pump 30 moves the folded corner 12k forward after the planned folding position 12 of the front side member 10 is folded in a Z shape. By restricting this, the escape of the force applied to the planned bending position 13 of the front side member 10 is suppressed. For this reason, after the front side member 10 is bent into the Z shape at the planned folding position 12 at the time of the frontal collision of the vehicle, the planned bending position 13 of the front side member 10 is reliably bent. Therefore, the impact at the time of the frontal collision of the vehicle is efficiently absorbed by the front side member 10, and the influence at the time of the frontal collision of the vehicle on the vehicle compartment 2 side can be minimized.

[Embodiment 2]
Hereinafter, the vehicle body front part structure according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7. Although the example of forming the stopper 34 on the housing 31 of the electric pump 30 has been shown in the vehicle body front structure according to the first embodiment described above, the stopper 34 is formed on the housing 31 of the electric pump 30 due to problems such as arrangement. It may not be possible. In such a case, in the vehicle body front structure according to the present embodiment, the stopper 54 is formed using the housing 51 of the compressor 50 for an air conditioner.
That is, a stopper 54 is formed at the right end of the housing 51 of the compressor 50 as shown in FIG. 6 and the like, and a stepped stopper wall 54 w is formed at the rear end position of the stopper 54.
With the above configuration, for example, when an impact at the time of an offset collision is applied to the front right side of the body 1, as shown in FIG. 7, the planned folding position 12 of the right front side member 10 is folded into a Z shape. That is, the front bent corner portion 12e when bent into a Z-shape protrudes to the outside of the engine room Er, and the rear bent corner portion 12k enters the inside of the engine room Er. As a result, the rear bent corner 12k of the front side member 10 is hung on the stopper wall 54w of the stopper 54 of the compressor 50. As a result, since the rear bent corner 12k of the front side member 10 is supported from the front side by the stopper 54, the bending force applied to the planned bending position 13 of the front side member 10 does not escape forward, and FIG. As shown in FIG. 3, the planned bending position 13 is surely bent into a substantially square shape.
Thereby, the impact at the time of an offset collision is efficiently absorbed by the front side member 10, and the influence at the time of the vehicle front collision given to the vehicle compartment 2 side can be minimized.

<Example of vehicle body front structure change>
In addition, this invention is not limited to the said embodiment, The change in the range which does not deviate from the summary of this invention is possible. For example, in the first embodiment, the stopper 34 is formed on the ceiling plate 32 of the housing 31 of the electric pump 30, and the rear bent corner portion 12k is supported by the stopper 34 from the front side. However, instead of providing the stopper 34, the height of the housing 31 of the electric pump 30 is increased, the position of the housing 31 is slightly shifted forward, and the rear side of the front side member 10 is folded at the rear side of the housing 31. A configuration that supports the corner 12k is also possible.
In the second embodiment, the stopper 54 is provided by using the housing 51 of the compressor 50. However, instead of the compressor 50, a configuration in which the stopper is attached to a support member of the engine E or another engine auxiliary machine is also possible. is there.
Further, in the present embodiment, an example in which the planned folding position 12 is provided at the front part of the front side member 10 and the planned bending position 13 is provided at the rear part has been shown, but the positions of both the parts 12 and 13 can be interchanged in front and back. is there.

It is the side view (A figure) and top view (B figure) showing the vehicle body front part structure which concern on Embodiment 1 of this invention. FIG. 3 is a plan view (A diagram) illustrating a vehicle body front portion structure according to Embodiment 1 of the present invention, and a plan view (B portion) illustrating a state of deformation of a front side member at the time of a vehicle front collision. It is a top view showing a mode that the folding position of a front side member will fold at the time of vehicle front collision. It is the perspective view (A figure) and top view (B figure) showing the electric pump used in the vehicle body front part structure which concerns on Embodiment 1 of this invention. It is the perspective view which looked at the front side member of the motor vehicle from the lower part. It is a top view (A figure) showing the vehicle body front part structure which concerns on Embodiment 2 of this invention, and a top view (B part) showing the mode of a deformation | transformation of the front side member at the time of a vehicle front collision. It is a top view showing a mode that the folding position of a front side member will fold at the time of vehicle front collision. It is a top view showing the conventional vehicle body front part structure (A figure), and a top view (B part) showing the mode of a deformation | transformation of the front side member at the time of a vehicle front collision.

Explanation of symbols

E ... Engine Er ... Engine room 10 ... Front side member 12 ... Expected folding position 13 ... Expected bending position 12k ... Rear side corner (broken Corner)
30 ... Electric pump (engine accessory)
31 ... Housing 34 ... Stopper 50 ... Compressor (engine accessory)
51 ··· Housing 54 ··· Stopper

Claims (4)

A vehicle body front structure configured to absorb an impact load at the time of a vehicle front collision by folding a front side member in an engine room at a planned bending position at a vehicle front collision and further bending at a planned bending position,
When the front side member is folded at the planned folding position, the engine accessory that is in a position where the folded corner abuts is provided with a stopper that restricts the broken corner from moving in the vehicle longitudinal direction. And
The stopper is configured to restrict the movement of the bent corner in the vehicle front-rear direction so as to suppress the escape of the force applied to the planned bending position of the front side member. Part structure. The vehicle body front part structure according to claim 1,
The front side member is scheduled to be folded in a Z-shape when the vehicle collides with the front-side member, and the front-side bent corner when it is folded into the Z-shape projects to the outside of the engine room, and the rear-side bent corner is inside the engine room. In the configuration to enter, the planned bending position is provided behind the rear side corner,
The front structure of the vehicle body is characterized in that the stopper is configured to be able to restrict the rear bent corner portion of the front side member from moving forward. The vehicle body front part structure according to claim 1 or 2,
The front structure of the vehicle body, wherein the stopper is formed in a housing of an electric pump attached to a side surface of the engine. The vehicle body front part structure according to claim 1 or 2,
The front structure of the vehicle body, wherein the stopper is formed in a housing of a compressor attached to the engine.

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