JP7064921B2 - Vehicle front body structure - Google Patents

Description

The present invention relates to the front body structure of the vehicle, and in particular, the front portion of the vehicle provided with a load transmitting member arranged outside the front side frame in the vehicle width direction and inclined outward in the vehicle width direction toward the front of the vehicle. It is related to the vehicle body structure.

In recent years, when a collision object (for example, a barrier) collides with a position outside the vehicle width direction from the front side frame (hereinafter referred to as "small overlap collision"), the collision load is transmitted to the front side frame to cause a collision. Various techniques for absorbing energy have been proposed.

As a technique for absorbing such collision energy, for example, there is one described in Patent Document 1.

The technique of Patent Document 1 is a front side frame when a vehicle collides with a small overlap with one end (“front fixing portion”) fixed to the outer end portion (“overhanging portion”) of the bumper beam in the vehicle width direction. A load transmission member (“slide spacer”) having an other end portion (“stoppered member”) capable of contacting the “vehicle body side stopper portion” arranged in the above is provided (FIGS. 13 and 14). reference).

According to such techniques, when a vehicle collides with a small overlap,
(A) The "slide spacer" slides toward the rear of the vehicle along the front side frame.
(B) The "stopper member" of the "slide spacer" abuts on the "vehicle body side stopper" (of the suspension member fixed to the front side frame).
(C) The "slide spacer" presses the front side member inward in the vehicle width direction while causing a rotational displacement around the "vehicle body side stopper".
(D) The front side member bends and deforms around the "vehicle body side stopper".
Since it is possible to cause such a movement, the collision energy can be effectively absorbed by the deformation of the front side frame.

Japanese Unexamined Patent Publication No. 2014-113894

However, in the technique of Patent Document 1, when a vehicle collides with a small overlap, the front side frame is configured to be locally bent from the "vehicle body side stopper" as a starting point, and therefore, depending on the magnitude of the collision load. The amount of deformation of the front side frame tends to be large.

In such a case, although the technique of Patent Document 1 can effectively absorb the collision energy, if the vehicle equipment such as the engine is arranged inside the front side frame in the vehicle width direction, the vehicle equipment is damaged or damaged. There is a risk.

The present invention has been made to solve such a problem, and an object of the present invention is to satisfactorily absorb collision energy while suppressing the amount of deformation of the front side frame when a vehicle collides with a small overlap. Is to provide the front body structure of the vehicle capable of.

According to the front vehicle body structure of the vehicle according to the present invention, the above-mentioned problems include a pair of left and right side frames extending in the front-rear direction of the vehicle, a bumper beam arranged on the front side of the side frame and extending in the vehicle width direction, and the above-mentioned problems. A load transmitting member connected to the outer side surface in the vehicle width direction of the side frame and extending inclining outward in the vehicle width direction toward the front of the vehicle is provided, and the load transmitting member stands up from the side surface on the rear side of the vehicle. The standing portion has an upright portion, and when a predetermined load toward at least the inside in the vehicle width direction is input to the load transmission member, the upright portion transmits the load on the outer side surface in the vehicle width direction of the side frame. The solution is that the members are configured to come into contact with the side surface on the rear side of the vehicle from the connection position to which the members are connected.

In the above configuration, when the vehicle collides with a small overlap,
(A) The load transmitting member moves to the rear of the vehicle with the connection position with the side frame as the center of rotation, and presses the side frame from diagonally forward to deform it.
(B) When the load transmitting member invades the side frame by a certain amount (when the side frame is deformed by a certain amount), the standing portion abuts on the outer side surface of the side frame in the vehicle width direction.
It is configured to behave like this.

That is, in the above configuration, when the load transmitting member invades the side frame by a certain amount, further intrusion is restricted by the upright portion, so that the deformation of the side frame inward in the vehicle width direction is suppressed. can do.

Therefore, in the above configuration, the amount of deformation of the side frame can be suppressed, so that the vehicle equipment is damaged even when the vehicle equipment is adjacently arranged inside the side frame in the vehicle width direction, for example. It is possible to suppress damage and the like.

Further, in the above configuration, since the upright portion comes into contact with the side frame and then continues to press (deform), the collision load can be efficiently transmitted to the side frame, so that the collision energy is effectively absorbed. can do.

As described above, in the above configuration, when the vehicle collides with a small overlap, it is possible to effectively absorb the collision energy without deforming the side frame more than necessary.

In the invention relating to the front vehicle body structure of the vehicle, it is preferable that the upright portion has a contact surface that makes surface contact with the outer side surface of the side frame in the vehicle width direction.

Further, in the invention relating to the front vehicle body structure of the vehicle, the side surface inside the vehicle width direction from the standing position of the side surface of the load transmitting member on the rear side of the vehicle and the standing portion. It is preferable that the angle formed is equal to or greater than a right angle.

Further, in the invention relating to the front body structure of the vehicle, the distance between the tip position inside the load transmitting member in the vehicle width direction and the standing position where the standing portion stands is the width in the plan view of the side frame. It is equal to or less than the dimension, or equal to or less than the additional dimension obtained by adding the distance between the vehicle equipment arranged inside the side frame in the vehicle width direction and the side frame to the width dimension in the plan view of the side frame. , And suitable.

As described above, according to the front body structure of the vehicle according to the present invention, although the structure is simple, when the vehicle collides with a small overlap, the collision energy is generated without deforming the side frame more than necessary. Can be effectively absorbed.

It is a top view of the front body structure of the vehicle which concerns on this embodiment. It is a schematic diagram which shows the state immediately after the vehicle of FIG. 1 has a small overlap collision. It is a schematic diagram which shows the state after FIG. It is a schematic diagram which shows the state after FIG. It is a schematic diagram which shows the state after FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the front vehicle body structure of the vehicle according to the present embodiment, FIG. 2 is a schematic view showing a state immediately after the vehicle of FIG. 1 has a small overlap collision, and FIG. 3 shows a state after FIG. A schematic diagram, FIG. 4 is a schematic diagram showing a state after FIG. 3, and FIG. 5 is a schematic diagram showing a state after FIG. In the figure, FR indicates the front of the vehicle, IN indicates the vehicle width direction, and the left-right direction in the following description means the left-right direction when facing the front of the vehicle. Further, in the front body structure of the vehicle according to the present embodiment, the structure on the right side in the vehicle width direction and the structure on the left side in the vehicle width direction have almost the same structure. The explanation of the structure on the right side in the vehicle width direction will be omitted unless necessary.

As shown in FIG. 1, the front vehicle body structure of the vehicle 1 according to the present embodiment includes a pair of left and right front side frames 2 and 2 (front side frames 2 on the right side in the vehicle width direction) extending along the vehicle front-rear direction. (Not shown), the bumper beam 3 arranged on the front side of the vehicle of the pair of front side frames 2 and 2, the shock absorber 4 arranged between the front side frame 2 and the bumper beam 3, and the front side frame. It includes a gusset 10 attached to the outer side surface in the vehicle width direction of No. 2 and a vehicle device 50 such as an engine arranged between the front side frames 2 and 2. The vehicle 1, the front side frame 2, the bumper beam 3, the gusset 10, and the vehicle equipment 50 are the "vehicle", the "side frame", and the "bumper beam" described in the claims, respectively. , "Load transmission member" and "vehicle equipment".

First, the front side frame 2 will be described.
The front side frame 2 is made of a steel plate member and is formed in a rectangular closed cross section. As will be described in detail later, the vehicle device 50 is arranged so as to be adjacent to the inner side surface of the front side frame 2 in the vehicle width direction.

A shock absorber mounting portion for fixing the rear end portion 4B of the shock absorber 4 described later with the front side frame mounting portion 5a of the vehicle equipment support member 5 described later sandwiched between the front end portions of the front side frame 2. 2a is provided.

Here, the vehicle equipment support member 5 will be described.
The vehicle equipment support member 5 includes a main body portion (not shown) that supports the vehicle equipment such as a radiator (not shown) and an extension portion 5A extending in opposite directions from both ends of the main body portion in the vehicle width direction. Have. The extension portion 5A includes a front side frame mounting portion 5a attached to the front side frame 2 and a gusset support member mounting portion arranged outside the front side frame mounting portion 5a in the vehicle width direction and attached to the gusset support member 20 described later. A portion 5b is provided.

Next, the bumper beam 3 will be described.
The bumper beam 3 is formed in a rectangular closed cross section by a member made of a steel plate, and extends along the vehicle width direction on the rear side of the bumper (not shown) made of a member made of resin or the like.
The bumper beam 3 is formed in a curved shape so that the central portion 3C in the vehicle width direction is located on the front side of the vehicle rather than both ends 3A and 3A in the vehicle width direction.

The bumper beam 3 has a shock absorber mounting portion 3a attached to the shock absorber 4 on the rear surface of both ends 3A in the vehicle width direction on the rear side of the vehicle, and is located outside the vehicle width direction along the vehicle width direction. The overhanging portion 3B is arranged so as to extend.

Next, the shock absorber 4 will be described.
The impact absorber 4 is a so-called crash box that absorbs collision energy by crushing in the axial direction (front-rear direction of the vehicle) when a collision load F is input from the front of the vehicle (see FIG. 2 and the like). Since such a shock absorber 4 is now known, detailed description thereof will be omitted, but for example, it can be formed into a rectangular closed cross section by a member made of a steel plate.

The front end portion 4A of the shock absorber 4 is fixed to the shock absorber mounting portion 3a of the bumper beam 3 by welding, bolting, or the like. Further, the shock absorber 4 is bolted with the front side frame mounting portion 5a of the vehicle equipment support member 5 interposed between the rear end portion 4B and the shock absorber mounting portion 2a of the front side frame 2. By doing so, it is fixed to the front side frame 2.

Next, the gusset 10 will be described.
The gusset 10 is formed by bending a steel plate member into an M-shaped cross section or a C-shaped cross section, and is attached to the front side frame 2 so as to be inclined toward the front side of the vehicle and the outside in the vehicle width direction. It is extended to.

The gusset 10 according to the present embodiment is configured to be attached to the front side frame 2 via the gusset support member 20. Further, the gusset 10 is arranged in a direction of opening outward in the vehicle width direction (rear side of the vehicle) in a state of being attached to the front side (direction in which the opening end side of the side surface is located on the outer side of the vehicle width direction (rear side of the vehicle)). It is supposed to be done.

Here, the gusset support member 20 will be described.
The gusset support member 20 is formed by bending a steel plate member into a substantially C-shaped cross section, and a front side frame mounting portion 20a attached to the front side frame 2 is provided at the rear end portion of the vehicle, and a bottom surface thereof. A support member mounting portion 20b to be attached to the gusset support member mounting portion 5b of the vehicle equipment support member 5 is provided in the vicinity of the central portion in the longitudinal direction of the vehicle.

The gusset 10 is fixed to the gusset support member 20 by welding, bolting, or the like while being fitted between the wall portions on both sides of the gusset support member 20.

Further, in the gusset support member 20, the front side frame mounting portion 20a is attached to the outer side surface of the front side frame 2 in the vehicle width direction, and the support member mounting portion 20b is attached to the gusset support member mounting portion 5b of the vehicle equipment support member 5, respectively. , In the aligned state, it is fixed to the front side frame 2 by inserting and tightening a bolt or the like. The gusset support member 20 may be attached to the front side frame 2 by welding in addition to bolting, or by welding alone.

In the present embodiment, the gusset 10 has a contact member 30 projecting from the rear side surface of the vehicle (outer side surface in the vehicle width direction).

Here, the contact member 30 will be described.
The abutting member 30 is formed, for example, by combining (welding or the like) steel materials having an L-shaped cross section or a C-shaped cross section in a triangular shape, and by welding or bolting to the rear side surface of the gusset 10 on the vehicle rear side. It has a bottom surface portion 30a to be attached, an upright surface portion 30b that bends and stands up from the vehicle rear side end portion of the bottom surface portion 30a, and a connecting surface portion 30c that connects the bottom surface portion 30a and the upright surface portion 30b. The upright surface portion 30b corresponds to the "upright portion" and the "contact surface" described in the claims.

As will be described in detail later, when the gusset 10 is inserted into the front side frame 2 by the input of the collision load F, the contact member 30 (upright surface portion 30b) comes into surface contact with the outer side surface of the front side frame 2 in the vehicle width direction. This suppresses further intrusion of the gusset 10.

Here, the upright surface portion 30b will be described.
The upright surface portion 30b is formed in a flat surface shape, and in a state where the contact member 30 is attached to the gusset 10, the upright position P is the tip position inside the gusset 10 in the vehicle width direction (for example, the rear inner end portion of the vehicle). When the shape of is an arc shape as shown by the dotted line in FIG. 1, the distance L1 (in this embodiment, the “width (width dimension) W” of the front side frame 2) is separated from the arc tip position). Be placed.

As will be described in detail later, by setting the distance L1 to the width W of the front side frame 2 (distance L1 = width W), the upright surface portion 30b is in contact with the front side frame 2 in the vehicle width direction of the front side frame 2. The amount of protrusion from the inner side surface can be set to about the thickness (thickness) of two sheets (thickness × 2) of the front side frame 2 (see FIG. 5). The distance L1 can be set to, for example, a width W or less of the front side frame 2 (for example, a distance of “width W”-“wall thickness” × 2).

Further, as in the present embodiment, when the vehicle equipment 50 is adjacently arranged inside the front side frame 2 in the vehicle width direction, the distance L1 is set to the width W of the front side frame 2 and the front is arranged. It is also possible to make it less than or equal to the value (additional dimension) obtained by adding the distance (distance L2) between the inner side surface of the side frame 2 in the vehicle width direction and the vehicle equipment 50. In this case, even if the front side frame 2 comes into contact with the vehicle equipment 50, it is possible to effectively reduce damage or damage to the vehicle equipment 50.

In the present embodiment, the upright surface portion 30b is set so that the angle θ formed with the inner side surface of the gusset 10 in the vehicle width direction is “90 °” or more (“90 °” in the present embodiment).

This is because, if this angle θ is set to a value smaller than “90 °”, when the gusset 10 enters the front side frame 2, the upright surface portion is first placed on the outer side surface of the front side frame 2 in the vehicle width direction. The corners (corners) formed between the upright surface portion 30b and the connecting surface portion 30c are likely to come into contact with each other instead of the 30b (plane), and when the collision load F is input to the gusset 10 in this state, the front side frame This is because the possibility that 2 is locally deformed increases.

Next, the behavior when the vehicle 1 having the front vehicle body structure configured in this way collides with a small overlap will be described with reference to FIGS. 2 to 5.

As shown in FIG. 2, when the vehicle 1 collides with a small overlap (when the collision target C such as a barrier collides with the overhanging portion 3B of the bumper beam 3), the collision load F acts on the gusset 10 via the overhanging portion 3B. It will be. In response to such an input of the collision load F, the tip end side of the overhanging portion 3B moves toward the rear of the vehicle, and the impact absorber 4 is gradually crushed.

When the collision load F is input to the gusset 10, first, the front side frame mounting portion 20a of the gusset support member 20 having a lower strength than the gusset 10 is deformed, and then the gusset 10 passes through the gusset support member 20. The front side frame 2 is pressed on the outer side surface in the vehicle width direction. The input direction of the collision load F at this time is an oblique direction toward the rear side of the vehicle and inward in the vehicle width direction.
With the input of such a collision load F, the front side frame 2 is gradually deformed toward the inside in the vehicle width direction on the outer side surface in the vehicle width direction.

After that, when the collision load F is input to the gusset 10, the gusset 10 further presses (deforms) the front side frame 2 while the front end portion 10A side draws an arc toward the rear of the vehicle. It will move (see Fig. 3).

FIG. 4 shows a state immediately after the upright surface portion 30b of the contact member 30 is brought into contact with the outer side surface of the front side frame 2 in the vehicle width direction due to further pressing (intrusion) of the gusset 10 against the front side frame 2.

In the present embodiment, in the state shown in FIG. 4, the contact of the contact member 30 (upright surface portion 30b) with the front side frame 2 significantly restricts the subsequent intrusion of the gusset 10 into the front side frame 2. It has become. In the present embodiment, as described above, the upright surface portion 30b stands up at a position (distance L1) separated from the tip position T of the gusset 10 by the width W of the front side frame 2. Therefore, the front in this state. The deformation of the side frame 2 on the inner side surface side in the vehicle width direction is about twice as high as the wall thickness of the front side frame 2.

After that, as the invasion of the collision target C into the vehicle 1 progresses, the input direction of the collision load F changes from the diagonal direction toward the rear side of the vehicle and inward in the vehicle width direction to the direction inward in the vehicle width direction (FIG. 5).

Then, the front side frame 2 is pressed inward in the vehicle width direction by the gusset 10 in a state where the contact member 30 (upright surface portion 30b) is in surface contact.
That is, in the state shown in FIG. 5, since the front side frame 2 is pressed by the upright surface portion 30b, the collision load F is reduced by this deformation while suppressing the amount of deformation of the front side frame 2. It is possible to efficiently transmit to.
In this respect, it can be said that in the present embodiment, even if the state is changed to the state shown in FIG. 5, it is possible to suppress the damage / damage of the vehicle equipment 50 and to effectively absorb the collision energy. ..

As described above, in the present embodiment, when the gusset 10 invades the front side frame 2 by a certain amount, the intrusion of the gusset 10 beyond that is restricted by the contact member 30, so that the vehicle equipment 50 is damaged or damaged. It can be suppressed.

Further, in the present embodiment, since the contact member 30 is configured to be pressed (deformed) in a state of being in surface contact with the front side frame 2, the collision load F is efficiently transmitted to the front side frame 2. As a result, it is possible to effectively absorb the collision energy.

Further, in the present embodiment, the angle θ formed by the upright surface portion 30b and the inner side surface in the vehicle width direction of the upright position P of the inner side surface in the vehicle width direction of the gusset 10 is “90 °” (“90 ° or more””. ), It is easy to bring the contact member 30 (upright surface portion 30b) into surface contact with the front side frame 2. In this respect, it can be said that the collision energy can be absorbed more effectively in the present embodiment.

Further, in the present embodiment, since the upright surface portion 30b stands at a position separated from the tip position T of the gusset 10 by the width W of the front side frame 2, the front side frame 2 is deformed on the inner side surface in the vehicle width direction. , It is possible to raise the height by twice the wall thickness of the front side frame 2. Therefore, in the present embodiment, it is possible to surely reduce the damage / damage of the vehicle equipment 50 arranged adjacently inside the front side frame 2 in the vehicle width direction.

In the present embodiment, the triangular contact member 30 is attached to the rear side surface of the gusset 10 on the vehicle rear side, but a member having another shape (provided that an upright portion such as the upright surface portion 30b is arranged) For example, it is also possible to attach an L-shape).

Further, in the present embodiment, a member (upright surface portion 30b) that comes into surface contact with the front side frame 2 is arranged on the vehicle rear side surface of the gusset 10, but the present invention is not limited to this, and for example, linear contact is possible. Members (for example, corners of a steel material having an L-shaped cross section) may be arranged.

Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the essays and drawings which form a part of the disclosure of the present invention according to this embodiment. That is, it should be added that all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are of course included in the scope of the present invention.

1: Vehicle 2: Front side frame, 2a: Impact absorber mounting part 3: Bumper beam, 3A: Both ends in the vehicle width direction, 3B: Overhanging part, 3C: Center part in the vehicle width direction, 3a: Impact absorber mounting part 4, Impact absorber, 4A: Front end, 4B: Rear end, 5: Vehicle equipment support member, 5A: Extension, 5a: Front side frame mounting part, 5b: Gasset support member mounting part, 10: Gasset 10,A: front end, 20: gusset support member, 20a: front side frame mounting part, 20b: support member mounting part, 30: contact member, 30a: bottom surface part, 30b: upright surface part, 30c: connecting surface part, 50: Vehicle equipment, P: Standing position, T: Tip position, W: Width, L1, L2: Distance, θ: Angle, F: Collision load, C: Collision target

Claims (5)

A pair of left and right side frames that extend in the front-rear direction of the vehicle,
A bumper beam that is placed on the front side of the vehicle and extends in the vehicle width direction of the side frame,
A vehicle equipment support member having a main body portion that supports the vehicle equipment inside the side frame in the vehicle width direction and an extension portion extending from the main body portion to the outside in the vehicle width direction from the side frame.
A load transmitting member connected to the outer side surface of the side frame in the vehicle width direction, one end in the longitudinal direction is connected to the side frame, and the extension portion is attached in the vicinity of the central portion in the longitudinal direction. The load transmission member is provided so as to be inclined outward in the vehicle width direction toward the front of the vehicle from the connection position of one end with the side frame .
The load transmission member is
It has an upright part that stands up from the side surface on the rear side of the vehicle.
The upright part is
When a predetermined load toward the inside in the vehicle width direction is input to the load transmission member, the vehicle is rearward from the connection position to which the load transmission member is connected on the outer side surface in the vehicle width direction of the side frame. It is configured to contact the side of the side,
The front body structure of the vehicle is characterized by that. The front body structure of a vehicle according to claim 1, wherein the upright portion has a contact surface that comes into surface contact with a side surface of the side frame on the outer side in the vehicle width direction. A claim characterized in that the angle formed by the side surface of the load transmitting member on the rear side of the vehicle, which is inside the vehicle width direction from the standing position where the standing portion stands, and the standing portion is at a right angle or more. The front body structure of the vehicle according to claim 1 or 2. 1. Item The front body structure of the vehicle according to any one of items 3. The distance between the tip position inside the load transmitting member in the vehicle width direction and the standing position where the standing portion stands is arranged inside the vehicle width direction of the side frame in the width dimension in the plan view of the side frame. The front body structure of the vehicle according to any one of claims 1 to 3, wherein the additional dimension is equal to or less than the addition dimension obtained by adding the distance between the vehicle device and the side frame.

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