JP2019172165A - Front structure of vehicle - Google Patents

Abstract

To provide a front structure of a vehicle which can improve impact absorption performance at a front collision of a vehicle more than before.SOLUTION: A front structure A of a vehicle comprises a front side reinforcing member 2 and a rear side reinforcing member 3, the front side reinforcing member 2 extends to a vehicle fore-and-aft direction along an inner face of a front side member 1 in both positions of a vehicle front side and a vehicle rear side of a wheel relief recess 1a of the front side member 1, and a bend deformation trigger part 21 which is easily bent and deformed more than a peripheral part is arranged in a middle portion of the front side reinforcing member 2 in the vehicle fore-and-aft direction. The rear side reinforcing member 3 is located at a vehicle rear side of the front side reinforcing member 2, formed into a bulk shape for partially blocking the inside of the front side member 1, and joined to a rear part of the front side reinforcing member 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a front structure of a vehicle such as an automobile.

An example of a front structure of a vehicle is disclosed in Patent Document 1.
In the structure described in this document, a wheel escape recess for avoiding interference with the wheel is provided on the outer surface side of the front side member that is disposed on the vehicle width direction side portion of the vehicle front portion and extends in the vehicle front-rear direction. It has been. If such a wheel escape recess is provided, the rigidity of this portion is reduced. Therefore, in Patent Document 1, a power plant (engine) mount bracket is attached to the front side member so as to straddle the wheel escape recess in the vehicle longitudinal direction. This mount bracket serves to reinforce the formation portion of the wheel escape recess. For this reason, it is possible to prevent the front side member from being greatly distorted (deformed) during normal traveling of the vehicle. In addition, when a load is applied to the front end of the front side member during a frontal collision of the vehicle, the formation of the wheel escape recess is prevented from being easily broken by a small load. An impact absorbing action can be obtained.

  However, the prior art still has room for improvement as described below.

That is, in recent years, the engine room provided in the front part of the vehicle tends to be narrowed, and this tendency is particularly strong in the case of small cars. If the engine room is narrowed, the front and rear length of the front side member cannot be made too long, and the size of the crash zone that can be effectively deformed at the time of a frontal collision of the vehicle cannot be made too long. Therefore, it is required to improve the shock absorbing performance of the vehicle more than before. This is the same in the prior art.
Conventionally, as described in Patent Document 2, by providing a weak part (bending deformation trigger part) in the front side member, the front side member and the vicinity of the front end part are compressed and deformed at the time of frontal collision of the vehicle. In addition to the above, there is a means for improving the shock absorbing performance by causing the front side member to bend and deform. Although such a means should just be applicable as it is to the said prior art (patent document 1), the said prior art is the structure which tries to prevent that a front side member breaks carelessly in the position of the recessed part for wheel escape. For this reason, it is difficult to adopt the means described in Patent Document 2 as it is, and it is not rational.

JP 2000-289651 A JP 2009-255883 A

  The present invention has been conceived under the circumstances as described above, and provides a vehicle front structure capable of improving the shock absorption performance at the time of a vehicle front collision than before. And that is the challenge.

  In order to solve the above problems, the present invention takes the following technical means.

  The front structure of a vehicle provided by the present invention is a hollow cross-section front that is located on the side in the vehicle width direction of the front of the vehicle, extends in the vehicle front-rear direction, and is provided with a wheel escape recess on the outer surface side. A side member, a mounting bracket mounting portion for setting a mounting bracket for a power plant, which is set at a location straddling the wheel escape recess in the vehicle front-rear direction among the front side members, and the front side member A vehicle front part structure including a reinforcing member provided at a position corresponding to the mount bracket mounting portion, and the front reinforcing member and the rear reinforcing member are used as the reinforcing members. And the front side reinforcing member is disposed between the front side mem- ber between the vehicle front side and the vehicle rear side of the wheel escape recess. A bending deformation trigger portion that extends in the vehicle longitudinal direction along the inner surface of the bar and that is easier to bend and deform than the peripheral portion is provided in the middle portion of the front reinforcing member in the vehicle longitudinal direction. The reinforcing member is located on the vehicle rear side of the front reinforcing member, has a bulk shape that partially closes the inside of the front side member, and is joined to the rear portion of the front reinforcing member.

According to such a configuration, the following effects can be obtained.
First, because the wheel escape recesses of the front side member are appropriately reinforced by the front reinforcing member in addition to the power plant mounting bracket, the front side member of the front side member is It is possible to more appropriately prevent a large distortion (deformation) from occurring at the formation portion of the wheel escape recess.
Second, when the front side member receives a compressive force due to a load input from the front of the vehicle at the time of a frontal collision of the vehicle, the inner surface of the front side member is compared with the bulky rear side reinforcing member. Since the front side reinforcing member provided so as to extend in a state where the front side reinforcing member is plunged, it is possible to cause a bending deformation at a position where the wheel escape recess is formed, starting from the bending deformation trigger part of the front side reinforcing member. Therefore, the impact absorption performance of the vehicle can be enhanced by this bending deformation.
Thirdly, by appropriately selecting the specific arrangement, size, rigidity, etc. of the bending deformation trigger part, such as the size and material of the front side reinforcing member, conditions for causing the above-described bending deformation can be easily achieved. And it is possible to control appropriately.
4thly, the effect that the mounting rigidity of the mount bracket for power plants is improved by the front side reinforcement member and the rear side reinforcement member is also acquired.

  In the present invention, it is preferable that a curved portion that is curved so as to be positioned inward in the vehicle width direction toward the vehicle rear side is formed on the vehicle rear side of the front side member of the front side member. An additional reinforcing member that reinforces the suspension member mounting portion is provided in a portion of the curved portion that is separated from the rear reinforcing member toward the vehicle rear side.

  According to such a configuration, at the time of a frontal collision of the vehicle, not only at the position where the wheel escape recess of the front side member is formed, but also at a position between the additional reinforcing member and the rear reinforcing member, bending deformation is caused. Can be generated. Therefore, it is possible to further improve the impact absorption performance at the time of front collision of the vehicle. Where the wheel escape recess is formed, it is a bending deformation that protrudes inward in the vehicle width direction, whereas at the position between the additional reinforcement member and the rear reinforcement member, it is outside the vehicle width direction. It becomes a bending deformation that is convex toward the side, and both of these bending deformations can be appropriately generated.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a principal part perspective view which shows an example of the front part structure of the vehicle which concerns on this invention. (A) is IIa-IIa sectional drawing of FIG. 1, (b) is IIb-IIb sectional drawing of FIG. It is a principal part schematic plan view of FIG.

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

  A vehicle front structure A shown in FIG. 1 includes a front side member 1, a front reinforcing member 2, a rear reinforcing member 3, and an additional reinforcing member 4.

  The front side member 1 is located in the vehicle width direction side portion of the front portion of the vehicle and extends in the vehicle front-rear direction. FIG. 1 shows the front side member 1 on the left side of the vehicle, but the right side of the vehicle has the same configuration. The front side member 1 is configured as a closed cross-section structure with a hollow cross-section, and as shown in FIG. 2, the side plate 11 is joined to the upper and lower flange portions 10 a and 10 b of the cross-section hat-shaped member 10. . FIG. 1 shows a state in which the side plate 11 is omitted.

The front side member 1 is provided with a wheel escape recess 1a, a mount bracket mounting portion 1b, and a suspension member mounting portion 1c.
The wheel escape recess 1 a is a part for avoiding interference with a wheel (front wheel) (not shown), and is provided on the outer surface side of the front side member 1.
The mount bracket mounting portion 1b is a portion for mounting a mount bracket 5 that supports an engine (power plant) (not shown). For example, a bolt that uses a welding nut 6 on the upper wall portion 10c of the front side member 1 is used. This is a configuration in which a screw hole 60 for fastening is provided (see also FIG. 2A). The mount bracket mounting portion 1b is provided so as to straddle the wheel escape recess 1a in the vehicle longitudinal direction.
The suspension member attaching portion 1c is a portion for attaching one end portion of the support arm 70 of the suspension member 7, and is provided on the lower wall portion 10d of the front side member 1, for example. Specific positions of the suspension member attaching portion 1c and the additional reinforcing member 4 for reinforcing the suspension member attaching portion 1c will be described later.

  The front side reinforcing member 2 and the rear side reinforcing member 3 are provided on the inner side of the front side member 1 in an arrangement corresponding to the mount bracket mounting portion 1b and the wheel escape recess 1a.

  The front reinforcing member 2 is formed by pressing a metal plate and includes an upper wall portion 20c, a lower wall portion 20d, and an upright wall portion 20e as shown in FIG. And these are set so as to oppose and contact each inner surface of the upper wall portion 10c, the lower wall portion 10d and the side wall portion 10e of the front side member 1, and are welded to the front side member 1. As shown in FIG. 1, the front reinforcing member 2 is arranged in the vehicle front-rear direction along the inner surface of each part of the front side member 1 between the vehicle front side and the vehicle rear side positions of the wheel escape recess 1 a. It is an extended form.

The front reinforcing member 2 is provided with a bending deformation trigger part 21. The bending deformation trigger part 21 is a part in which the rigidity is locally reduced as compared with the front region and the rear region of the bending deformation trigger part 21. In the present embodiment, as means for providing the bending deformation trigger portion 21, a protruding bead portion 22 that protrudes outward in the vehicle width direction and extends in the vehicle front-rear direction is provided on the standing wall portion 20e of the front reinforcing member 2, and this By providing a concave portion in a part of the convex bead portion 22, means for using the concave portion as a bending deformation trigger portion 21 is employed. According to such a configuration, the bending deformation triggering part 21 with the rigidity partially reduced while maintaining the strength of each part of the front side reinforcing member 2 at a predetermined level or more due to the presence of the convex bead part 22 appropriately. Can be provided. Preferably, the bending deformation opportunity part 21 is the arrangement | positioning which corresponds with the recessed part 1a for wheel escape in the vehicle front-back direction.

  The rear reinforcing member 3 is located on the vehicle rear side of the front reinforcing member 2 and has a bulk shape that partially closes the inside of the front side member 1. More specifically, the rear reinforcing member 3 has a plate member 30 that fits inside the front side member 1 and partially closes the inside of the front side member 1 as shown in FIG. is doing. The rear reinforcing member 3 is welded to the rear portion of the front reinforcing member 2.

  As shown in FIG. 3, the front side member 1 has a curved portion 1 e that is gently curved so as to be located on the inner side in the vehicle width direction toward the rear side of the vehicle in a region on the rear side of the vehicle with respect to the rear reinforcing member 3. Have. In FIG. 3, the curved portion 1 e is shown as a smooth curved shape, but the present invention is not limited to this, and the basic form of the front side member 1 may be curved. The additional reinforcing member 4 is provided in the curved part 1e in the position spaced apart from the rear side reinforcing member 3 to the vehicle rear side.

  The additional reinforcing member 4 is a member for reinforcing the suspension member mounting portion 1 c and is welded to the inside of the front side member 1. The additional reinforcing member 4 has a strength equal to or close to that of the rear reinforcing member 3 described above, and the suspension member mounting portion 1c is less likely to be bent and deformed than the surrounding front and rear regions. It is said.

  Next, the operation of the vehicle front structure A will be described.

  First, the formation portion of the wheel escape recess 1a of the front side member 1 is reinforced by the power plant mount bracket 5, but in addition to this, the front side reinforcement member 2 is also appropriately reinforced. Therefore, it is possible to appropriately prevent a large distortion from occurring at the position where the wheel escape recess 1a of the front side member 1 is formed during normal traveling of the vehicle.

  On the other hand, when a frontal collision of the vehicle occurs and a load F is input to the front side member 1 from the front of the vehicle, the front end side of the front side member 1 is compressed and deformed, thereby absorbing the shock. . When the load F acts on the front side reinforcing member 2 and the rear side reinforcing member 3, the bulky rear side reinforcing member 3 having a high strength is thrust toward the rear side reinforcing member 3 from the front side of the vehicle. The reinforcing member 2 is received. For this reason, bending deformation occurs in the front reinforcing member 2 and the front side member 1 starting from the bending deformation trigger portion 21 of the front reinforcing member 2. This bending deformation is a deformation in which the formation portion of the wheel escape recess 1a is displaced inward in the vehicle width direction, as indicated by an arrow Na in FIG. By causing such bending deformation, the amount of energy absorption with respect to the impact load can be increased, and the impact absorption performance of the vehicle can be enhanced.

  The conditions under which the front side member 1 causes the bending deformation described above can be controlled by appropriately selecting the rigidity of the bending deformation trigger portion 21 of the front reinforcing member 2. Therefore, excellent shock absorbing performance can be obtained in accordance with various conditions such as the size of the engine room of the vehicle or the longitudinal length of the front side member 1. In addition, the presence of the front side reinforcing member 2 and the rear side reinforcing member 3 also provides an effect of increasing the mounting rigidity of the power plant mounting bracket 5.

As described above, the curved portion 1e and the additional reinforcing member 4 with high strength are provided on the vehicle rear side of the rear reinforcing member 3, so that the arrow Nb in FIG. As shown, a bending deformation in which an intermediate portion between the additional reinforcing member 4 and the rear reinforcing member 3 is displaced outward in the vehicle width direction can be caused. As a result, it is possible to further improve the impact absorption performance at the time of a frontal collision of the vehicle. Since the additional reinforcing member 4 is a member for reinforcing the suspension member mounting portion 1c, the configuration is rational as compared with the case where a dedicated reinforcing member is used, and the number of parts and the weight are increased. Can be avoided.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the front structure of the vehicle according to the present invention can be variously modified within the scope intended by the present invention.

  Specific shapes, sizes, materials, and the like of the front reinforcing member and the rear reinforcing member are not limited to the above-described embodiments. The bending deformation opportunity part can also be made into the structure (fragile part) which provided the notch part, the thin part, etc. in the front side reinforcement member, for example. Moreover, although it is preferable that the position in the vehicle front-rear direction coincides with the wheel escape recess, the bending deformation trigger portion may have a slight deviation.

A Vehicle front structure 1 Front side member 1a Wheel escape recess 1b Mount bracket mounting part 1c Suspension member mounting part 1e Bending part 2 Front side reinforcing member 21 Bending deformation trigger part 3 Rear side reinforcing member 4 Additional reinforcing member

Claims (2)

A front side member having a hollow cross-sectional shape, which is located on the vehicle width direction side portion of the front portion of the vehicle and extends in the vehicle front-rear direction, and is provided with a wheel escape recess on the outer surface side;
Of this front side member, the mounting bracket mounting portion for setting the mounting bracket for the power plant, which is set at a location straddling the wheel escape recess in the vehicle longitudinal direction,
Among the inside of the front side member, a reinforcing member provided at a location corresponding to the mount bracket mounting portion,
A vehicle front structure comprising:
As the reinforcing member, a front reinforcing member and a rear reinforcing member are provided,
The front reinforcing member extends in the vehicle front-rear direction along the inner surface of the front side member between the vehicle front side and the vehicle rear side positions of the wheel escape recess, and the front reinforcing member is in the middle of the vehicle front-rear direction. The part is provided with a bending deformation opportunity part that is easier to bend and deform than the peripheral part,
The rear side reinforcing member is located on the vehicle rear side of the front side reinforcing member, has a bulk shape that partially closes the inside of the front side member, and is joined to the rear part of the front side reinforcing member. And the front structure of the vehicle. The vehicle front structure according to claim 1,
Of the front side member, a curved portion is formed on the vehicle rear side of the rear side reinforcing member so as to be located on the vehicle width direction inner side toward the vehicle rear side.
A vehicle front structure in which an additional reinforcing member that reinforces the suspension member mounting portion is provided in a portion of the curved portion that is spaced apart from the rear reinforcing member toward the vehicle rear side.

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