JP3018867B2 - Body front structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front structure of a vehicle body to which a power unit is attached.

[0002]

2. Description of the Related Art A power unit integrally including an engine and a transmission is disposed in an engine room at a front portion of a vehicle body and is attached to a strength member at a front portion of the vehicle body via an engine mount. .

For example, FIG. 3 to FIG.
1475 is a schematic diagram showing a state of mounting a power unit in a conventional vehicle described in Japanese Patent Application Publication No. 1475. This power unit 1 is arranged in an engine room 4 defined by a dash panel 2 at a front portion of a vehicle body and a cabin 3 side. Both sides are provided on both sides of the engine room 4, and extend substantially horizontally from the front cross member 6 at the front end of the vehicle body where the front bumper 5 is provided to the dash panel 2, and from there rearward Front side members 7, 7 which are curved downward and connected substantially horizontally to the floor surface 3a of the passenger compartment 3 are fixed via engine mounts 8, 8, respectively. Upper surface side of a suspension cross member 9 provided at the lower portion of the engine room 4 so as to be substantially the same height as the floor surface 3a of the vehicle. , And is fixed via the engine mount 10. Further, on the front side of the vehicle body, a center member 11 connecting the center of the front cross member 6 in the vehicle width direction connecting the front ends of the front side members 7 and 7 and the center of the suspension cross member 9 in the vehicle width direction. It is fixed to the upper surface via an engine mount 12. Also, the engine mounts 8, 10, 12 are:
Each of the vehicle body side link and the engine side link, an insulator interposed between the two links, and a connecting member for connecting the two links with the insulator interposed therebetween.

Then, as described above, the power unit 1
Are attached to the front side members 7, 7 and the suspension cross member 9 and the center member 11, which are strength members at the front of the vehicle body, via the engine mounts 8, 10, 12, respectively, at four locations, front, rear, left, and right, so that the vehicle can be started or stopped. Load in the front and rear direction due to inertia at the time of acceleration and deceleration, load in the left and right direction due to centrifugal force such as when running on a curve,
It is fixed while giving a buffering action to a load in the vertical direction due to vibration or the like during running and a load in the rotational direction due to the reaction force of the rotating engine.

[0005]

When a load is input to the vehicle body from the front due to a collision or the like, and the power unit 1 including the engine is pushed backward of the vehicle body, the power unit 1 is attached to the left and right front side members 7,7. The load is input from the engine mounts 8, 8 to the rear portions of the front side members 7, 7, but since the front side members 7, 7 are curved, as shown in FIG. A moment M1 is generated at the lower part of the curved portion connected to the floor surface 3a.

The engine mount 10 mounted on the suspension cross member 9 is mounted on the upper surface side of the suspension cross member 9, so that when a load is input from the front of the vehicle body, the suspension cross member 9 is pushed upward. Such a moment M2 is generated. The suspension cross member 9 is
Since it is attached to the left and right front side members 7, 7, the force for pushing the front side member 7 upward is transmitted, and the moment M1 is further increased.

As described above, the front side members 7, 7
Is bent at the lower portion of the curved portion, the proportion of the load F transmitted to the floor side of the load from the front of the vehicle body decreases, and the cushioning effect of the collision load decreases. In order to prevent bending of the front side members 7, 7, for example, it is necessary to reinforce the front side members 7 by attaching reinforces or to increase the thickness of the dash panel 2 to increase rigidity. In this case, there is also a problem that the weight of the vehicle body increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle body front structure in which a power unit which moves rearward due to a load at the time of a collision is dropped downward so as not to adversely affect the cabin space.

[0009]

As a means for solving the above-mentioned problems, the present invention is directed to a device provided on the front side of a vehicle body in a passenger compartment.
Power unit is located in the
And the power unit is an engine mount
Through the suspension cross member on the vehicle body
In the vehicle body front structure of the lifting Configurations, the power
The lower surface of the unit, the suspension cross member and the front
The floor of the guest room is set at almost the same height,
The engine mount is behind the body of the power unit
Side and the engine mount
Is attached to the rear side of the body of the power unit,
And input to the power unit from the front side of the vehicle body.
Power unit link to which the applied load is transmitted, and
The power unit is disposed on the rear side of the vehicle body, and
Attached to the lower surface of the suspension cross member
Body side link, the power unit side link and the car
Link with the body side link and the power unit side link.
Link transmitting the load transmitted to the link to the vehicle body side link.
A connection member, and the connection member is disposed at a position lower than a lower surface of the power unit and lower than a lower surface of the suspension cross member.

[0010]

[ Function ] As described above , the power unit is
Through the engine mount provided on the rear side of the
Supported by the suspension cross member on the vehicle body side
ing. For this reason, the load due to collision, etc.
When input to the power unit, this load is
It is transmitted to the engine mount on the rear side of the body of the knit.
Then, the load on the power unit side is
And transmitted to the connecting member via the link. Where the power
The lower surface of the knit and the suspension cross member are almost the same
Flip provided at a height, and consolidated member is lower than the lower surface of the power unit, and, because they are located at a position lower than the lower surface of the suspension cross member, communicating
The load transmitted to the binding member, the connecting member, a moment such as lowering down the sub spare <br/> emissions Deployment cross member downward is generated. Therefore, due to loads such as collisions,
A power unit that moves towards after the body is dropped downwards. And the suspension cross member and the front of the body
Is installed at approximately the same height as the guest room floor
Et al., The range of adverse effects to the room space by the power unit to move to the rear person can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the vehicle body front structure according to the present invention will be described below with reference to FIGS. The same components as those of the conventional vehicle body front structure shown in FIGS. 3 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted. Also,
The engine mount used when mounting the power unit on the front of the vehicle body includes a power unit side link mounted on the power unit, a vehicle body side link mounted on the vehicle body,
Use is made of a connecting member that connects these two links with an insulator interposed therebetween.

The power unit 1 is disposed in an engine room 4 defined by a dash panel 2 at the front of the vehicle body and on the side of the passenger compartment 3. Both sides of the power unit 1 are mounted on front side members 7, 7. , 8, and the front side of the vehicle body is attached to a center member 11 via an engine mount 12.

The rear side of the vehicle body of the power unit 1 has an engine mount 20 substantially at the center in the vehicle width direction.
At the time of attachment to the suspension cross member 9 provided at substantially the same height as the floor surface 3a of the guest room 3 via
An opening is formed in the suspension cross member 9 to penetrate the lower end of the power unit side link 20a attached substantially at the center of the power unit 1 in the vehicle width direction, and penetrates the lower surface thereof. A pin-shaped connecting member 20c is connected to a lower end of the vehicle body side link 20b which is attached and provided substantially vertically, with a rubber insulator interposed between both lower ends.

Next, the operation of this embodiment configured as described above will be described. The power unit 1 is mounted on the front side members 7, 7 and the center member 11 and the suspension cross member 9 with respect to the engine mount. 8, 12, 20, the load in the front-rear direction due to inertia when the vehicle starts, accelerates, and decelerates;
It is firmly fixed while being buffered by an interposed insulator against a load in a vertical direction due to vibration or the like during traveling and a load in a rotational direction due to a reaction force of a rotating engine.

Then, a load due to a collision or the like is input to the vehicle body from the front, and a power unit 1 including an engine is provided.
Is pushed into the rear of the vehicle body, the engine mounts 8, 8 mounted on the front side members 7, 7 are mounted.
From the rear side of the front side members 7, 7, a load is input, but as shown in FIG.
Engine mount 20 attached to the rear center of the vehicle
The lower end of the power unit side link 20a extending through the suspension cross member 9 and extending to the lower surface side thereof is connected to the lower end of the vehicle body side link 20b attached to the lower surface side of the suspension cross member 9.

Since this connection point is located below the lower surface of the power unit 1, the front side member 7
However, even if a moment M1 in the direction of lifting the front end side with the lower rear portion as a fulcrum occurs, the connecting portion between the power unit side link 20a and the vehicle body side link 20b has a moment M3 in the direction of pushing down the suspension cross member 9. Is generated, and a force is generated to pull the front side members 7, 7 connected to the suspension cross member downward.

The above-described downward force acts on the front side members 7, 7 in a direction to offset the moment M1 in the direction of lifting the front end side with the rear lower portion as a fulcrum. The front end of 7, 7 does not lift, and the load F from the front
Can be reliably transmitted to a safe and secure floor side. Therefore, the burden load on the dash panel 2 which is the front end of the passenger compartment 3 is reduced, and the safety of the passenger compartment space is ensured.

As a result, in order to prevent adverse effects on the passenger compartment space due to the power unit moving backward in the event of a collision,
In order to increase the strength of the lower rear portion of the curved portion of the left and right front side members 7, 7, the thickness of the material is increased, a reinforcing member is attached inside the front side member 7 to increase rigidity, or It is not necessary to take measures such as increasing the strength of the panel 2 to prevent the front side members 7, 7 from being lifted, and to reduce the thickness of each of the front side members 7, 7 and the dash panel 2 to reduce the weight. it can.

[0019]

As described above, in the vehicle body front structure according to the present invention , the power unit is arranged so that the power unit is located rearward of the vehicle body.
Suspension on the vehicle body side via the engine mount provided on the side
Supported by a pension cross member. others
Load from the front of the vehicle to the power unit
If input, this load will be
It is transmitted to the engine mount on the other side. Then the power
The load on the unit side is linked via the link on the power unit side.
It is transmitted to the binding member. Here, the lower surface of the power unit
The suspension cross member is installed at almost the same height
Is and and consolidated member is lower than the lower surface of the power unit, and, because it is located lower than the lower surface of the suspension cross member is transmitted to the coupling member
Of the suspension cross-measure
A moment is generated in the direction of pushing the member downward.
Therefore, it moves to the rear of the vehicle due to a load such as a collision.
The power unit is dropped down. And sa
Spence cross member and passenger cabin floor in front of vehicle
Because There is provided at substantially the same height as, it is possible to prevent an adverse effect on the room space by the power unit that moves backward in the time of impact.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a vehicle body front structure according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the action of a collision load in this embodiment.

FIG. 3 is a schematic view showing a conventional body front structure.

FIG. 4 is a schematic plan view of FIG.

FIG. 5 is an explanatory view showing the action of a collision load in this conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power unit 2 Dash panel 3 Guest room 3a Floor surface 4 Engine room 7 Front side member 8, 12, 20 Engine mount 9 Suspension cross member 11 Center member 20a Power unit side link 20b Body side link 20c Connecting member

Claims (1)

(57) [Claims] 1. An engine provided on a front side of a vehicle body in a passenger compartment.
While the power unit is arranged in the room,
The power unit is connected to the vehicle body via an engine mount.
Supported by the side suspension cross member
In the vehicle body front structure of the configuration, the suspension cross the lower surface of the power unit
The members and the floor surface of the guest room are provided at almost the same height.
The engine mount is mounted on the power unit.
The engine is provided on the rear side of the vehicle body.
The mount is mounted on the rear side of the power unit.
And the front side of the vehicle body with respect to the power unit.
Power unit side ring to which the load input from
And the power unit is arranged on the rear side of the vehicle body.
Attached to the lower surface of the suspension cross member
Vehicle body side link and the power unit side link
And the vehicle body side link, and the power unit
The load transmitted to the link on the vehicle side is transmitted to the link on the vehicle body side.
And a connecting member that reaches the power unit, and the connecting member is disposed at a position lower than a lower surface of the power unit and lower than a lower surface of the suspension cross member.