JP2004249796A - Front structure of car body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front structure of a car body capable of preventing a mass such as an engine etc. from intruding into a car cabin when the car goes in a frontal collision and of absorbing the energy due to collision. <P>SOLUTION: The front structure of the car body is configured so that a block-form stopper 26 to interfere with the engine 16 retreating in the event of collision and suppressing a further rotational displacement of the engine 16 is installed over the front right end of a front suspension member 24. This can hinder the engine 16 from making a further displacement and from intruding into the cabin. An abut load is generated when the engine 16 abuts to the stopper 26, and part or the whole of the collision load goes to an under-body 12 through the front suspension member 24, so that it is also possible to obtain an energy absorbing effect at the time of collision. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle body front structure in which a countermeasure for a collision from the front is taken.
[0002]
[Prior art]
At the time of a collision from the front (at the time of an offset collision or a full lap collision), the load input to the front of the vehicle is input to the engine, and the engine may be displaced toward the rear of the vehicle. As a prior art that has taken measures for that purpose, there is one disclosed in Patent Document 1 below.
[0003]
In brief, in this prior art, the front end of the front side member is branched into an upper frame and a lower frame. The upper frame is disposed substantially horizontally, and its tip is connected to the front bumper reinforcement via a crash member. On the other hand, the lower frame is arranged obliquely, and its tip is connected to the end of the radiator lower support frame.
[0004]
The power unit including the engine and the transmission has a center of gravity portion supported from below by a center mount disposed on a cross member bridged between the left and right front side members, while a front end portion is provided on a lower frame. It is supported by the front mount arranged in the. With this configuration, the power unit is supported by the vehicle body with the front part slightly inclined higher than the rear part.
[0005]
According to the above configuration, at the time of a collision from the front, the lower frame is bent upward while being crushed, and the base end of the upper frame is pushed up. Thereby, the front side member is deformed and pushes up the front part of the power unit via the front mount. As a result, the power unit rotates clockwise in a side view with the center mount supporting the portion serving as the center of gravity position from the lower side as a swing center, and causes the transmission located at the rear of the power unit to drop below the vehicle compartment. That is.
[0006]
[Patent Document 1]
JP-A-8-104254
[Problems to be solved by the invention]
However, in the case of the technique described in Patent Document 1, there is a problem that energy cannot be absorbed at the time of a collision because the power unit (transmission) is dropped at the time of a collision from the front.
[0008]
The present invention has been made in consideration of the above facts, and provides a vehicle body front structure capable of preventing a mass body such as an engine from entering a vehicle interior at the time of a collision from the front and absorbing energy at the time of a collision. Is the purpose.
[0009]
[Means for Solving the Problems]
The vehicle body front structure according to the first aspect of the present invention is arranged so as to be bridged between a pair of front side members arranged below the both sides of the vehicle body front part with the vehicle longitudinal direction as a longitudinal direction. A vehicle body front structure further comprising a front suspension member that is disposed on the vehicle rear side of a mass body such as an engine disposed in an engine room and further supports left and right front suspension arms, The front suspension member is provided with an abutting portion that abuts on a mass body that retreats in the event of a collision from the front and suppresses or suppresses retraction of the mass body.
[0010]
In the vehicle body front structure according to the present invention, the vehicle front-rear direction is disposed below both sides of the vehicle body front part in a longitudinal direction, and the rear part is disposed at a position lower than the front part in a side view. A pair of front side members, a front cross member disposed with the vehicle width direction as a longitudinal direction, and disposed so as to be bridged between front portions of the pair of front side members, and a first support provided on the front cross member. And a second and a third support point behind and above the first support point at the front of the pair of front side members, and receiving a collision load at the first support point. A front suspension which is disposed on the vehicle rear side with respect to an engine which is rotatable about a virtual center axis connecting the second and third support points, and both ends of which are supported by rear portions of the pair of front side members; And a vehicle body front structure, comprising: a further collisional displacement of the engine on a movement trajectory when the engine is rotationally displaced around a virtual center axis during a collision from the front. An obstructing interference portion is provided on the front suspension member.
[0011]
According to the first aspect of the present invention, at the time of a collision from the front, the collision load input to the front portion of the vehicle is input to a mass body such as an engine, and the mass body may be displaced rearward of the vehicle. In this case, in the present invention, the retreating mass body abuts on an abutting portion provided on the front suspension member. As a result, a contact load is generated, and the collision load at the time of a collision is transmitted to the front suspension member. The load transmitted to the front suspension member is further transmitted to an underbody including a part (rear part) of the front side member. As a result, according to the present invention, it is possible to prevent the mass body from entering the vehicle interior at the time of a collision from the front. In addition, part or all of the energy at the time of the collision is absorbed in the process of being transmitted to the front suspension member, the front side member, and the underbody.
[0012]
The operation of the present invention described in claim 2 is as follows.
[0013]
The engine is supported with a first support point on the front cross member and a second support point and a third support point on the front of the pair of front side members. Since the second support point and the third support point are located rearward and upward with respect to the first support point, at the time of a collision from the front, the collision load input to the front of the vehicle is equal to the first load. Entered at the support point. The engine can be rotationally displaced around a virtual center axis connecting the second support point and the third support point. Therefore, when a collision load is input to the first support point, the engine rotates around the virtual center axis. Try to displace in rotation.
[0014]
At this time, if the interference portion is not provided on the front suspension member, the rotationally displaced engine and the front suspension member do not come into contact with each other. Not only is all the power transmitted to the front part of the front side member via the support point, but also the engine itself approaches the vehicle interior.
[0015]
However, in the present invention, since the interference portion that inhibits further rotation displacement of the engine is provided on the movement trajectory when the engine is rotationally displaced around the virtual center axis, the engine comes into contact with the interference portion, and The above rotational displacement is suppressed or suppressed. Further, thereby, a contact load is generated between the engine and the front suspension member, and the collision load at the time of collision is transmitted to the front suspension member. The load transmitted to the front suspension member is further transmitted to an underbody including a rear portion of the front side member. As a result, according to the present invention, it is possible to prevent the engine from entering the vehicle interior at the time of a collision from the front. In addition, part or all of the energy at the time of the collision is absorbed in the process of being transmitted to the front suspension member, the front side member, and the underbody.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a vehicle body front structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates a front side of the vehicle, an arrow UP indicates an upper side of the vehicle, and an arrow IN indicates an interior side of the vehicle.
[0017]
FIG. 1 is a perspective view showing an outline of a vehicle body front structure according to the present embodiment. As shown in this figure, a pair of long front side members 10 arranged substantially in parallel with the longitudinal direction of the vehicle are disposed below both sides of the front part of the vehicle body. As shown in the schematic diagram of FIG. 4, when the front side member 10 is viewed from the side, the front portion 10A and the rear portion 10B are arranged stepwise. The rear portion 10B is set at a position lower than the front portion 10A, and forms a part of the underbody 12 of the vehicle. In addition, a long front cross member 14 (added in FIG. 4) arranged with the vehicle width direction as a longitudinal direction is bridged and joined between the front portions 10A of the pair of left and right front side members 10. .
[0018]
An engine 16 as a “mass body” is supported by the pair of left and right front side members 10 and the front cross member 14 via an engine mount. Specifically, as shown in FIG. 4, the engine 16 is coupled to and supported by the front portion 10A of the right front side member 10 via an RH engine mount 18 as a “second support point”. , Is coupled to and supported by the front portion 10A of the left front side member 10 via the LH engine mount 20 as a "third support point". Further, the engine 16 is connected to and supported by the front cross member 14 via an FR engine mount 22 as a “first support point”. In addition, the drawing on the left side of FIG. 4 illustrates a state in which the engine 16 is supported on the vehicle body when the engine 16 is viewed from the front, and the numbers of the engine mounts are shown from the driver side.
[0019]
As can be seen from the drawing on the right side of FIG. 4, when the vehicle body front structure is viewed from the side, the FR engine mount 22 is located at the lower front, and the RH engine mount 18 and the LH engine mount 20 are located at the upper rear. Have been. Therefore, at the time of a collision from the front, a load is input to a portion where the FR engine mount 22 is set. That is, the FR engine mount 22 is a load input point at the time of a collision. Further, since the engine 16 is supported at three points by the front side member 10 and the front cross member 14, the engine 16 draws an obliquely inclined line segment connecting the RH engine mount 18 and the LH engine mount 20 to the rotation spindle (virtual axis). As the central axis (P), the rotational displacement occurs around the point O.
[0020]
As shown in FIG. 1, a front suspension member 24 that swingably supports a front suspension arm is disposed behind the engine 16 described above. Both ends of the front suspension member 24 are supported by the front side member 10.
[0021]
As shown in FIGS. 1 to 3, a block-shaped stopper 26 serving as a “contact portion” and an “interference portion” is disposed at the upper right front end of the front suspension member 24 (near the lower arm attachment portion). ing. The stopper 26 is a highly rigid member, and is formed separately from or integrally with the front suspension member 24. As shown in FIG. 3, the stopper 26 is formed in a trapezoidal shape when viewed from the side, and interferes with a movement trajectory (dashed-dotted arrow R in FIG. 3) when the vehicle collides from the front and the engine 16 retreats. The contact surface 26A is disposed at a position where the contact surface 26A moves.
[0022]
Next, the operation and effect of the present embodiment will be described.
[0023]
As shown in FIG. 4, at the time of a collision from the front, the collision load F input to the front of the vehicle is first input to the FR engine mount 22 which is a support point of the engine 16 to the front cross member 14. Since the RH engine mount 18 and the LH engine mount 20, which are support points of the engine 16 to the front side member 10, are located rearward and upward with respect to the FR engine mount 22, the engine 16 is centered on the point O. An attempt is made to rotate and displace around the rotation main axis P in the direction of arrow Q.
[0024]
At this time, as shown in FIG. 4, if the front suspension member 24 is not provided with the stopper 26, the rotationally displaced engine 16 and the front suspension member 24 do not come into contact with each other. Not only is all the power transmitted to the front portion 10A of the front side member 10 via the RH engine mount 18 and the LH engine mount 20 of the engine 16, but the engine 16 itself approaches the vehicle interior.
[0025]
However, in the vehicle body front structure according to the present embodiment, the high-strength stopper 26 is disposed on the upper right front end of the front suspension member 24, that is, on the movement trajectory R when the engine 16 is rotationally displaced around the rotation main axis P. Therefore, as shown in FIG. 3, the engine 16 abuts against the contact surface 26A of the stopper 26, and further rotational displacement is suppressed or suppressed. That is, in the vehicle body front structure according to the present embodiment, the retreat of the engine 16 is suppressed or suppressed by positively applying the engine 16 to the stopper 26 of the front suspension member 24 at the time of a collision from the front. .
[0026]
Further, thereby, a contact load is generated between the engine 16 and the front suspension member 24, and the collision load F at the time of collision is transmitted to the rear portion 10B of the front suspension member 24. The load transmitted to the rear portion 10B of the front side member 10 is further transmitted to the underbody 12 including the rear portion 10B of the front side member 10. Therefore, according to the present embodiment, part or all of the energy at the time of the collision is absorbed in the process of being transmitted to the front suspension member 24, the rear portion 10B of the front side member 10, and the underbody 12.
[0027]
Generally speaking, according to the vehicle body front structure according to the present embodiment, it is possible to prevent the engine 16 from entering the passenger compartment at the time of a collision from the front, and to absorb energy at the time of the collision.
[0028]
Further, according to the vehicle body front structure according to the present embodiment, the weight of the entire vehicle body can be reduced. That is, in the case where the stopper 26 is not set on the front suspension member 24 and the engine 16 does not come into contact with the front suspension member 24 at the time of a collision from the front, all of the collision load is reduced by the front side member 10 of the engine 16. From the RH engine mount 18 and the LH engine mount 20 which are support points for the front side member 10. For this reason, the front portion 10A of the front side member 10 must be reinforced so as to withstand the input load. By flowing the fluid into the body 12, the strength of the front portion 10A of the front side member 10 can be reduced. That is, special reinforcement for the front side member 10 which has been conventionally required is not required. Therefore, the weight of the front side member 10 can be reduced, and the weight of the entire vehicle body can be reduced.
[0029]
In the vehicle body front structure according to the present embodiment described above, the stopper 26 is set on the upper right front end of the front suspension member 24. However, the position where the stopper 26 is set depends on the displacement of the engine and the displacement of the engine depending on the vehicle type. Is appropriately changed in the relation of.
[0030]
Further, in the vehicle body front structure according to the present embodiment described above, the present invention is applied in relation to the engine 16, but is not limited thereto, and the present invention may be applied in relation to a mass body other than the engine. .
[0031]
【The invention's effect】
As described above, the vehicle body front structure according to the first aspect of the present invention is configured such that the front suspension member comes into contact with the mass body that retreats in the event of a collision from the front to suppress or suppress the retraction of the mass body. Since the contact portion is provided, there is an excellent effect that a mass body such as an engine can be prevented from entering the vehicle interior at the time of a collision from the front and energy at the time of the collision can be absorbed.
[0032]
In the vehicle body front structure according to the present invention, an interference that inhibits further rotational displacement of the engine on a movement trajectory when the engine rotationally displaces around a virtual center axis at the time of a collision from the front. Since the parts are provided on the front suspension member, it is possible to prevent a mass body such as an engine from entering the passenger compartment at the time of a collision from the front, and to have an excellent effect of absorbing energy at the time of a collision. Have.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an outline of a vehicle body front structure according to the present embodiment.
FIG. 2 is an enlarged perspective view of a main part showing a vicinity of a stopper shown in FIG. 1 in an enlarged manner.
FIG. 3 is a schematic diagram showing a state in which an engine contacts a stopper of a front suspension member.
FIG. 4 is a schematic diagram for explaining the relationship between the behavior of the engine at the time of a collision and the position of a front suspension member.
[Explanation of symbols]
10 Front side member 10A Front part 10B Rear part 12 Underbody 14 Front cross member 16 Engine (mass body)
18 RH engine mount (second support point)
20 LH engine mount (third support point)
22 FR engine mount (first support point)
24 Front suspension member 26 Stopper (contact part, interference part)
26A contact surface

Claims (2)

A mass body, such as an engine, disposed between the pair of front side members disposed longitudinally in the vehicle front-rear direction below both sides of the front part of the vehicle body and disposed in an engine room. A vehicle front structure further including a front suspension member that is disposed on the rear side of the vehicle and further supports left and right front suspension arms,
The front suspension member is provided with an abutting portion that abuts against a mass body that retreats at the time of a collision from the front and suppresses or suppresses retraction of the mass body.
A vehicle body front structure characterized by the following. A pair of front side members arranged below the both sides of the vehicle body front part with the vehicle front-rear direction as the longitudinal direction, and the rear part is arranged at a position lower than the front part in side view,
A front cross member arranged so as to extend in the vehicle width direction as a longitudinal direction, and arranged so as to be bridged between front portions of the pair of front side members;
The front cross member has a first support point, and front and rear portions of the pair of front side members have second and third support points behind and above the first support point. A rear end of the pair of front side members, which is disposed on the rear side of the vehicle with respect to an engine rotatable about an imaginary center axis connecting the second and third support points by receiving a collision load at the support point; A front suspension member supported by
The vehicle body front structure comprising:
At the time of a collision from the front, on the movement trajectory when the engine is rotationally displaced around the virtual center axis, an interference portion that inhibits further rotational displacement of the engine is provided on the front suspension member,
A vehicle body front structure characterized by the following.

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