JP2020121588A - Vehicle front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately prevent or suppress that a front side member is easily bent and deformed at the time of a front collision of a vehicle by a simple configuration, and to have excellent impact absorption performance and impact resistance at the time of a front collision of the vehicle. Provides a vehicle front structure capable of. SOLUTION: A vehicle front structure A has a cross member 6 joined to a floor portion 11 and extended in the vehicle width direction at a position on the rear side of the vehicle with respect to a bent portion 13a of the inner torque member 13, and a front side member 3. The front portion including the bent portion 13a of the inner torque member 13 and the annular portion L in which the three parties of the cross member 6 form an annular shape and are directly or indirectly joined to each other in the top view of the vehicle are provided. The base end portion 30a on the rear side of the front rising inclined portion 30 of the front side member 3 is arranged so as to overlap the inner region of the annular portion L in the vehicle front-rear direction. [Selection diagram] Fig. 6

Description

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

As an example of the vehicle front structure, there is one described in Patent Document 1.
The vehicle front structure described in the document includes a pair of left and right front side members as a skeletal member at the front of the vehicle body. The pair of front side members are arranged at a lower portion of the vehicle in the vehicle width direction and are spaced apart from each other, and extend in the vehicle front-rear direction. However, these front side members are provided with a front rising slope extending from the front part of the floor to the vehicle front side. The front rising slope does not have a front suspension suspension member attached thereto. Used for.
On the other hand, a floor tunnel portion extending in the vehicle front-rear direction is provided at a substantially central portion of the floor portion in the vehicle width direction. The front portion of the inner torque member for reinforcing the base portion of the floor tunnel portion is provided with a bent portion that is bent or curved outward in the vehicle width direction and has one end connected to the front side member. Has been. This bent portion corresponds to an inner torque box, and the existence of this bent portion enhances the vehicle body strength.

However, in the above-mentioned prior art, there is still room for improvement as described below.

That is, since the front side member is provided with the front rising slope portion, when a front collision of the vehicle occurs and a large collision load is input to the front side member from the front of the vehicle, the front rising slope portion is not moved. There is a possibility that bending deformation may occur such that the base end portion (bent portion) on the side of the portion is a starting point and the portion is bent upward. The occurrence of such bending deformation impairs the load transmissibility of the front side member, which is disadvantageous in obtaining excellent shock absorbing performance. It is also disadvantageous in improving the impact resistance (load resistance) at the time of a frontal collision of the vehicle.
Reinforcing the front side members by using a reinforcing member is conceivable as a means for solving the above-mentioned inconvenience. However, adopting such means causes an increase in vehicle weight and an increase in manufacturing cost. Become.

JP, 2005-162144, A

The present invention has been devised under the circumstances as described above, and appropriately prevents or suppresses the front side member from being easily bent and deformed at the time of a frontal collision of a vehicle with a simple configuration. It is an object of the present invention to provide a vehicle front structure capable of excellent impact absorption performance and impact resistance at the time of a frontal collision.

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

A vehicle front structure provided by the present invention extends in a vehicle front-rear direction at a lower portion of a vehicle front portion in a vehicle width direction at a distance from each other, and extends from a front portion of a floor portion to a vehicle front side. And a pair of left and right front side members having a front rising slope portion, and on the vehicle width direction inner side of the pair of front side members, extending in the vehicle front-rear direction at a position spaced from each other in the vehicle width direction, In addition, the front part of the vehicle includes a pair of left and right inner torque members provided with bent parts that are bent or curved outward in the vehicle width direction and connected to the front side members. A cross member joined to the floor portion and extending in the vehicle width direction at a position on the vehicle rear side of the bent portion of each of the inner torque members, each of the front side members, and each of the inner torque members. Of the cross member, and an annular portion in which the three members of the cross member form an annular shape in a vehicle top view and are directly or indirectly joined to each other. The base end portion is arranged so as to overlap the inner region of the annular portion in the vehicle front-rear direction.

With such a configuration, the following effects can be obtained.
Firstly, the front side member, the front portion of each inner torque member, and the annular portion formed by the three members of the cross member have high rigidity, and the base end of the front side member on the rear side of the front rising slope portion. The portion and the front and rear peripheral portions thereof are effectively reinforced by the annular portion. Therefore, when a front collision of the vehicle occurs and a large collision load is input to the front side member from the vehicle front side, it is possible to appropriately prevent or suppress the bending deformation in the rising direction of the front rising slope. Become. As a result, the load transmissibility of the front side member can be improved, the shock absorbing performance of the vehicle can be improved, the strength of the vehicle body can be increased, and the shock resistance (load resistance) can be improved.
Secondly, in the present invention, the cross member is used as the reinforcing means of the front side member, but the cross member is a member forming a part of the predetermined annular portion described above, and has a relatively small size. It’s fine. Further, in the present invention, the front side member is reinforced by utilizing the structure of the annular portion using a plurality of predetermined members, and it is not necessary to form each portion to a considerable thickness. Therefore, it is possible to suppress an increase in vehicle weight and an increase in manufacturing cost.
Thirdly, the front portion of the inner torque member and the cross member forming the annular portion deform or displace the vicinity of the annular portion of the front side member inward in the vehicle width direction at the time of a vehicle front collision. When such a force is generated, a tension force against the force is exerted, and an action of suppressing the deformation or displacement is also produced. Further, the cross member also exerts an effect of preventing the front side member and the inner torque member from being largely displaced in the vehicle front-rear direction at the time of a frontal collision of the vehicle. By doing so, it is possible to further improve the load transmissibility of the front side member at the time of a frontal collision of the vehicle, the impact resistance, and the like.

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

(A) is a principal part side view which shows an example of the vehicle front part structure which concerns on this invention, (b) is an enlarged principal part side sectional view of (a). FIG. 2 is a bottom view of a main part of FIG. 1. It is a principal part enlarged view of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. It is a principal part perspective view of FIG. FIG. 3 is a plan view of a main part of FIG. 2 (a plan view of a vehicle). FIG. 7 is a sectional view taken along line VII-VII of FIG. 6.

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

The vehicle front portion structure A shown in FIGS. A suspension member 4 (also referred to as a subframe) of a front suspension that suspends the vehicle, a floor portion 11 in which a floor tunnel portion 12 is formed, an upper member 3A, a pair of left and right inner torque members 13, and a pair of left and right cross members 6. doing.

The pair of front side members 3 extend in the vehicle front-rear direction at a lower portion of the front portion of the vehicle with a space therebetween in the vehicle width direction. As shown in FIG. 4 and FIG. 5, each front side member 3 is configured using a member having a hat-shaped cross section, for example, and at the place where the floor portion 11 of the vehicle 1 is provided, this floor portion is provided. It is welded to the lower surface of 11.

As shown in FIG. 1, each front side member 3 has a front rising slope 30 extending from the front part of the floor portion 11 toward the front side of the vehicle. The area on the rear side is a substantially horizontal area.
In the drawings, the center line CL is appropriately drawn by an imaginary line, but the center line CL is the front-rear direction center line of the base end portion 30a (bent portion) on the rear side of the front rising slope portion 30.

On the other hand, in the vehicle top view (including the bottom view, the same applies hereinafter), the pair of front side members 3 includes the front portion 32 and the inwardly-inclined portion 33 (range shown by reference numeral Sa in the figure) as shown in FIG. ), and the rear extension portion 34 are connected in series.
An engine room 10 in which a power plant 2 including an engine and a transmission is arranged is provided in a front portion of a vehicle 1, and a front portion 32 of a pair of front side members 3 includes an engine room. It is located on both sides of 10 and extends substantially linearly in the vehicle front-rear direction. The inwardly-inclined portion 33 is a portion of the pair of front side members 3 that is inclined in a vehicle top view such that the peripheral portion of the mounting position of the suspension member 4 is narrower toward the vehicle rear side in the vehicle width direction mutual interval. .. A specific mounting structure of the suspension member 4 to the front side member 3 will be described later. The rear extension portion 34 is a portion connected to the rear portion of the inward entering slope portion 33, is located between the floor tunnel portion 12 and the rocker 15 in the vehicle width direction, and is joined to the lower surface portion of the floor portion 11. , Extends in the vehicle front-rear direction.

The floor portion 11 has a configuration in which a rear end portion of the dash panel 11a and a front end portion of the front floor panel 11b are joined via a joining portion 17. This joining is achieved by spot welding, for example, but as will be described later, the cross member 6 is further welded to this joining portion 17. As shown in FIGS. 2 and 4, both ends of the floor portion 11 in the vehicle width direction are joined (welded) to the pair of left and right rockers 15.

The upper member 3A is a member that is welded to the upper surface portion of the floor portion 11 and extends in the vehicle front-rear direction, and has, for example, a hat-shaped cross section. As well shown in FIGS. 4 and 5, the upper member 3A is provided on the floor portion 11 so as to overlap the upper side of the rear extension portion 34 of the front side member 3. The rear end portion of the upper member 3A is welded to the additional cross member 6a (see FIG. 2). Unlike the cross member 6, the additional cross member 6a does not correspond to the cross member in the present invention, but is disposed on the vehicle rear side of the cross member 6 and connects the rocker 15 and the floor tunnel portion 12 to each other. It is a bridge connection in the vehicle width direction.

As well shown in FIGS. 4 and 5, the pair of inner torque members 13 are welded to the lower surface side of the base portion of the floor tunnel portion 12 to reinforce the base portion of the floor tunnel portion 12. Each inner torque member 13 is provided so as to form a closed cross-section structure part in combination with the floor tunnel part 12. As shown clearly in FIGS. 2, 3 and 6, the pair of inner torque members 13 are spaced from each other in the vehicle width direction on the inner side in the vehicle width direction than the pair of front side members 3. The arrangement extends in the vehicle front-rear direction. A bent portion 13a that is bent or curved outward in the vehicle width direction is provided on the front portion of each inner torque member 13, and one end of this bent portion 13a has a front rising slope portion 30 of the front side member 3. Is welded to. The bent portion 13a corresponds to a so-called inner torque box portion.

The cross member 6 is formed using, for example, a hat-shaped member in cross section, and both end portions in the vehicle width direction are welded to the floor tunnel portion 12 and the upper member 3A so as to bridge and connect them in the vehicle width direction. The position at which the cross member 6 is provided is on the vehicle rear side with respect to each of the bent portion 13a of the inner torque member 13 and the base end portion 30a of the front rising slope portion 30 of the front side member 3. As a result, the front side member 3, the front portion including the bent portion 13a of the inner torque member 13, and the cross member 6 form an annular shape in a vehicle top view and are directly or indirectly welded to each other. It constitutes part L.
The front side member 3 and the front portion of the inner torque member 13 are directly welded, and the front side member 3 and the cross member 6 are indirectly welded via the upper member 3A and the floor portion 11. The cross member 6 and the front portion of the inner torque member 13 are indirectly welded to each other via the floor portion 11 (the base portion of the floor tunnel portion 12).

As shown clearly in FIGS. 3, 6 and 7, the rear end side base end portion 30a (and its center line CL) of the front side member 3 is a ring portion in the vehicle front-rear direction. The layout is set so as to overlap the inner area of L.

As shown in FIG. 7, the pair of flange portions 61 and 62 of the cross member 6 are joined to the floor portion 11 via welded portions Wa and Wb. However, the flange portion 61 is superposed on the joint portion 17 between the dash panel 11a and the front floor panel 11b and then joined to the joint portion 17 via the weld portion Wa. The welding portion Wa is preferably spot welding or the like for simultaneously welding the flange portion 61, the front end portion of the front floor panel 11b, and the rear end portion of the dash panel 11a.

1 and 2, the suspension member 4 is a member that rotatably supports the base end portion of the lower arm 7 that supports the front wheel 19, and is arranged below the front rising slope portion 30 of the front side member 3. .. The suspension member 4 and the front side member 3 are provided with a front mounting portion 9A and rear mounting portions 9B, 9B' for mounting the front and rear portions of both ends of the suspension member 4 in the vehicle width direction to the front side member 3. ing.

The front mounting portion 9A is a portion where the upper portion of the front bracket portion 41, which is provided upright on the upper surface portion of the suspension member 4 near the front portion, is fixed to the front side member 3 via the support member 39. Inside the front side member 3, a reinforcement 39a for increasing the mounting strength of the support member 39 is appropriately provided.
The rear mounting portion 9B is a portion where the rear portion of the suspension member 4 is fastened with a bolt 90 to the pedestal portion 38 welded to the lower surface side of the front rising slope portion 30. The rear mounting portion 9B′ is a portion where the stay 42 fixed to the rear portion of the suspension member 4 is fastened to the portion of the front rising inclined portion 30 below the pedestal portion 38 using a bolt 91.

A front wheel 19 is supported at the tip of the lower arm 7, and the base end of the lower arm 7 is rotatably connected to the suspension member 4 so that the front wheel 19 and the suspension member 4 can move up and down relatively. Has been done. More specifically, the base end portion of the lower arm 7 is branched into a front portion and a rear portion, and is attached to the suspension member 4 via the front rotation support portion 8A and the rear rotation support portion 8B. The front rotation support portion 8A is configured by using a rubber bush 81 having a central axis extending in a substantially horizontal direction, and the rear rotation support portion 8B has a standing rubber bush having a central axis extending in a vertical height direction. It is configured by using 82. The rubber bush 82, stay 42, suspension member 4, and pedestal portion 38 are fastened together using bolts 90.

As shown clearly in FIG. 3, the center P2 of the rear rotation support portion 8B of the lower arm 7 is offset from the center P1 of the front rotation support portion 8A by an appropriate dimension L1 inward in the vehicle width direction. .. According to such a configuration, it is possible to improve the maneuverability as compared with the other configuration. Further, the center P2 described above is located immediately below the front side member 3. Therefore, while simplifying the configuration, it is possible to enhance the building rigidity of the rear rotation support portion 8B and its peripheral portion and further improve the maneuverability.
Corresponding to the configuration described above, the rear mounting portions 9B and 9B' are offset from the front mounting portion 9A by an appropriate dimension L2 inward in the vehicle width direction. The inward sloped portion 33 arranges the rear mounting portions 9B and 9B′ of the suspension member 4 more inwardly than the front mounting portion 9A of the suspension member 4, and further, the center P2 of the rear rotation support portion 8B of the lower arm 7 is disposed. It is suitable for offsetting by an appropriate dimension L1 inward in the vehicle width direction from the center P1 of the front side rotation support portion 8A.

As shown in FIG. 2, the rear mounting portions 9B and 9B' of the front side member 3 and the front end of the rocker 15 are connected to each other via a torque box 14 (outer torque box). As a result, the torsional rigidity of the vehicle body can be further increased, and the rigidity in the vicinity of the rear mounting portions 9B and 9B' can be effectively increased to stabilize the support state of the suspension member 4.

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

First, as described above, the annular portion L is formed by directly or indirectly welding the front side member 3, the front portion including the bent portion 13a of the inner torque member 13, and the cross member 6 together. And is a region with high rigidity. Of the front side member 3, the base end portion 30a on the rear side of the front rising slope portion 30 and its front and rear peripheral portions are effectively reinforced by the annular portion L. Therefore, when a front collision of the vehicle 1 occurs and a large collision load F (see FIG. 2) is input to the front side member 3 from the front side of the vehicle, the front rising slope 30 is not bent and deformed so as to rise. Properly prevented or suppressed. As a result, the load transmissibility of the front side member 3 can be improved, and the shock absorbing performance of the vehicle 1 can be improved. Further, the strength of the vehicle body can be increased and the impact resistance (load resistance) can be improved.

In the present embodiment, the cross member 6 is used as the reinforcing means of the front side member 3, but the cross member 6 is of a relatively small size that can connect the base of the floor tunnel portion 12 and the upper member 3A. It’s fine. Further, in the present invention, the front side member 3 is reinforced by utilizing the annular portion L, and it is not necessary to form each portion to a considerable thickness. Therefore, it is possible to suppress an increase in weight of the vehicle 1 and an increase in manufacturing cost.

Since the front side member 3 is provided with the inwardly inclined portion 33, when a frontal collision of the vehicle 1 occurs and the collision load F is input to the front side member 3, the rearwardly inclined portion 33 is rearward. A force that tends to significantly deform the rear-side extending portion 34 on the rear side inward in the vehicle width direction is likely to be generated. On the other hand, the cross member 6 can be appropriately prevented from being strongly deformed inward in the vehicle width direction by generating a tensioning force against the above-mentioned force. Therefore, the load transmissibility of the front side member 3 and the shock absorbing performance of the vehicle 1 can be further improved.

Further, the cross member 6 has an effect of preventing the upper member 3A and the front side member 3 and the floor tunnel portion 12 from being largely displaced in the vehicle front-rear direction at the time of a frontal collision of the vehicle 1. Furthermore, since the cross member 6 is overlapped and joined to the joining portion 17 between the rear end portion of the dash panel 11a and the front end portion of the front floor panel 11b, the joining strength of these three members is enhanced. From the above, when the vehicle 1 collides with the front, due to the positional displacement between the upper member 3A and the front side member 3 and the floor tunnel portion 12, the joint portion 17 between the dash panel 11a and the front floor panel 11b is improper. It is also possible to appropriately prevent or suppress such peeling.

In the vehicle front structure A of the present embodiment, the center P2 of the rear rotation support portion 8B of the lower arm 7 is offset more inward in the vehicle width direction than the center P1 of the front rotation support portion 8A. It is necessary to increase the inclination angle of the inwardly inclined portion 33 as compared with the case where it is not. Therefore, originally, the rear extension 34 is more likely to be bent and deformed during the frontal collision of the vehicle 1, and the above-described peeling at the joint 17 of the floor 11 is more likely to occur. .. On the other hand, in the present embodiment, the above-described problem can be appropriately eliminated by the configuration in which the cross member 6 described above is provided.

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

In the above-described embodiment, the cross member 6 is arranged on the floor portion 11 and then the floor tunnel portion 12 and the upper member 3A are bridge-connected, but the present invention is not limited to this. In the present invention, for example, the cross member 6 may be arranged on the lower surface side of the floor portion 11 and then the front side member 3 and the inner torque member 13 may be bridge-connected.
In the above-described embodiment, a part of the cross member 6 is superposed on and joined to the joint portion 17 of the floor portion 11, which is preferable in order to increase the joint strength of these members. It is also possible to adopt a configuration that is not joined to.
From the viewpoint of improving the steerability of the vehicle 1, the center P2 of the rear rotation support portion 8B of the lower arm 7 of the front suspension is offset more inward in the vehicle width direction than the center P1 of the front rotation support portion 8A. However, it is also possible to adopt a different configuration.
It goes without saying that the vehicle front structure of the present invention is applicable not only to engine vehicles but also to hybrid vehicles and electric vehicles.

A Vehicle front structure L Annular portion 1 Vehicle 11 Floor portion 11a Dash panel 11b Front floor panel 12 Floor tunnel portion 13 Inner torque member 13a Bending portion 17 Joining portion 3 Front side member 3A Upper member 30 Front rising slope portion 4 Suspension member 6 Cross member

Claims (1)

A pair of left and right front sides that extend in the vehicle front-rear direction in the lower portion of the vehicle front portion and are spaced apart from each other in the vehicle width direction, and that have a front rising slope portion extending from the front portion of the floor portion to the vehicle front side. Members,
On the inner side in the vehicle width direction with respect to the pair of front side members, they extend in the vehicle front-rear direction in a vehicle width direction at a distance from each other, and the front portion bends outward in the vehicle width direction or A pair of left and right inner torque members that are curved and are provided with bent portions connected to the front side members;
A vehicle front structure comprising:
A cross member that is joined to the floor portion and extends in the vehicle width direction at a position on the vehicle rear side of the bent portion of each inner torque member,
Each of the front side members, the front portion of each of the inner torque members, and the three members of the cross member form an annular shape in a vehicle top view, and an annular portion that is directly or indirectly joined.
Is further equipped with
The vehicle front structure, wherein a rear end-side base end portion of the front rising slope portion is disposed so as to overlap an inner region of the annular portion in the vehicle front-rear direction.

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