JP4780444B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure in which an engine is disposed under a floor.

  In general, the body of an automobile is a so-called passenger car type in which a front body space and a passenger compartment space of an automobile are partitioned by a dash panel, an engine is installed in the front body space, and an occupant seat is provided in the passenger compartment space. A so-called cab-over type vehicle such as a one-bock car with an engine mounted under the floor such as the lower part of the seat and the front body space as narrow as possible is known.

  On the other hand, a front bumper is provided at the front part of the vehicle in order to protect the front body space from an impact load applied from the front, and in order to ensure the rigidity of the front bumper, the front bumper is provided at the front end of the front side member. The mounting structure is adopted. A dash lower cross member is provided between the front side members in order to protect the dash panel that partitions the front body space and the vehicle compartment space (see Patent Document 1).

Also, a front part of a vehicle is known in which a bumper stay and a lower cross member are disposed in front of a radiator mounting part in order to protect the front body space. In this prior art, a bumper stay and a lower cross member are disposed in the vehicle width direction on a radiator core support on which a radiator is disposed (see Patent Document 2).
JP 2002-249079 A JP 2004-331002 A

  In the invention of Patent Document 1 as described above, since the engine is disposed in the front body space, the front body space is wide, and when an impact load from the front is applied, it can be absorbed in the front body space. In the invention of Patent Document 2, since the engine is disposed in the front body space, the front body space is wide, and an impact load from the front can be received by the radiator core support, the bumper stay, and the lower cross member.

  However, in an automobile in which an engine is arranged below the floor, the front body space is set as narrow as possible, so that an impact load applied to the front of the vehicle body is directly transmitted to the dash panel and may reach the passenger compartment space. In particular, when an excessive impact load is applied from an obstacle in front, the frame portion may enter the obstacle. This is because the impact load cannot be received on a wide surface but is received on a small area, so that the surface pressure is increased and the obstacle is deformed. Since the cross member attached to the front end of the frame is easily deformed if the strength is weak, the impact load is received only in the vicinity of the front end of the frame and the frame attaching portion of the cross member, so that the surface pressure increases.

  An object of the present invention is to solve the above problems and to provide a vehicle front structure that can effectively receive an impact load applied from the front of a vehicle body.

In order to solve the above-described problems, the present invention provides a vehicle front structure in which an engine is disposed at a lower part of a floor, a dash panel that partitions a front body space and a vehicle interior space at the front of the vehicle, and a front end of the vehicle. A front bumper disposed; a radiator disposed in the front body space between the front bumper and the dash panel; disposed between the front bumper and the radiator; attached to the tip, the front structure of a vehicle having a lower cross member disposed in the vehicle width direction, and the upper cross-member disposed in the vehicle width direction in front of the radiator, said rear of the radiator provided by joining both side flange portions to the dash panel dash cross member that constitutes the closed cross section in cooperation with the dash panel in the vehicle width direction The upper cross-member, the lower cross member, and the dash cross member, in the vertical direction of the vehicle, located within a range from the upper end of the radiator to the lower end of the height, the front impact load of the vehicle body from the front When the load is transmitted to the upper cross member and the lower cross member via the front bumper and starts moving toward the rear of the vehicle body, the upper cross member and the lower cross member abut against the radiator, and Moving to the rear of the vehicle together with the radiator, the radiator contacts the dash cross member, and the radiator is placed between the dash cross member and the lower portion of the dash panel, so that the vehicle body parts move from the front. There is to catch .
Further, in the present invention, the height position of the upper cross member is an intermediate position of the radiator or a height position higher than the radiator, and the height position of the dash cross member is located behind the upper end portion of the radiator. It is in the height position to cross .
Furthermore, the present invention resides in that both ends of the lower cross member in the vehicle width direction extend outward in the vehicle width direction so as to overlap the front wheels when viewed from the front-rear direction of the vehicle body .

In the present invention, the input from the front is received by the upper cross member and the lower cross member, but the lower cross member is supported by the side frame on the side of the vehicle, the deformation is suppressed, and the radiator is supported at the center of the vehicle. Therefore, the deformation can be suppressed, so that the impact load can be received in a wide area without unnecessarily increasing the rigidity of the cross member. Further, the dash cross member suppresses the backward movement of the radiator and also suppresses the deformation of the dash panel. Thus, according to the present invention, a relatively rigid radiator can be used to receive an impact load on a wide surface without unnecessarily increasing the rigidity of the cross member. The rigidity of the can be improved.
Further, according to the present invention, the cross member retracted by the deformation force from the front can be brought into contact with the radiator with certainty. Deformation ahead of the vehicle can be suppressed. Furthermore, the retracted radiator can be brought into contact with the dash cross member.
Furthermore, the present invention can widen the pressure receiving range on the vehicle rear side, and can receive the deformation force in a wide range, thereby suppressing local deformation.

The embodiments shown in the drawings will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view showing a front structure of a vehicle in which an engine is arranged under a floor.
2 is a front view of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line CC of FIG.
1 to 3, reference numeral 1 denotes a vehicle body of a so-called cab over type vehicle in which an engine is disposed on the lower floor side, in the illustrated example, on the lower front seat side. In the front part of the vehicle body 1, a front body space A that serves as an engine room in a normal vehicle and a vehicle interior space B that serves as a passenger seat are partitioned by a dash panel 2. A front hood 3 is provided on the front portion of the vehicle body 1, and a bumper 4 is mounted on the lower side thereof. A lower cross member 5 as a so-called bumper member is provided on the rear surface side of the front bumper 4 in the vehicle width direction. The lower cross member 5 is a pair of side frames 6 disposed in the front-rear direction on the left and right sides of the vehicle body 1. It is attached to the front end. A belt-like upper cross member 7 is provided above the lower cross member 5 in the vehicle width direction. The upper cross member 7 is supported by the members constituting the dash panel 2 and the wheel house of the front wheel via support members 8 in the vicinity of the left and right ends.

  A radiator 9 is disposed behind the lower cross member 5 and the upper cross member 7, and the lower cross member extends along the vehicle width direction so as to intersect the front surface of the radiator 9 (so as to pass through the front). 5 and an upper cross member 7 are disposed. On the other hand, a belt-like dash cross member 10 is disposed on the front surface of the dash panel 2 along the vehicle width direction. The dash cross member 10 is formed in a rectangular cross section, and has a closed cross section formed by joining the flanges on both sides to the dash panel 2 and intersects the rear surface of the radiator 9 in the vertical direction (passes the rear). ) Is provided at height. That is, the dash cross member 10, the upper cross member 7, and the lower cross member 5 are arranged so as to be displaced from each other in the vertical direction within the range of the height from the upper end to the lower end of the radiator 9. The dash cross member 10 is disposed so as to cross the rear side of the upper end portion of the radiator 9, and the upper cross member 7 is disposed on the front side of the radiator 9 in the vicinity of the center in the vertical direction from the upper end to the lower end of the radiator 9. The lower cross member 5 is disposed so as to cross the front side of the lower end portion of the radiator 9.

  The lower cross member 5 is formed of a high-tensile steel plate, and has a quadrangular enlarged portion 5a having a large area at both ends. The enlarged portion 5a extends outward in the vehicle width direction so as to overlap the front surface of the front wheel 11 in the longitudinal direction of the vehicle body (see FIG. 2). The dash cross member 10 and the upper cross member 7 are also formed of high-tensile steel plates.

The operation of the above embodiment will be described.
When an impact load from the front acts on the front surface of the vehicle body 1, the load is transmitted to the upper cross member 7 and the lower cross member 5 via the bumper 4. When a load acts on the upper cross member 7 and the lower cross member 5, the load applied to the upper cross member 7 is transmitted to the members constituting the dash panel 2 and the front wheel house via the support member 8. The load applied to the lower cross member 5 is transmitted to the side frame 6 and is transmitted to the rear of the vehicle body via the side frame 6. When the upper cross member 7 and the lower cross member 5 start to move rearward of the vehicle body, the upper cross member 7 and the lower cross member 5 come into contact with the radiator 9, and the movement is blocked by the radiator 9, so that the impact is absorbed. . At this time, the enlarged portion 5a of the lower cross member 5 abuts against the tire of the front wheel 11 and is prevented from moving backward. Further, when the upper cross member 7 and the lower cross member 5 move rearward of the vehicle body together with the radiator 9, the upper cross member 7 and the lower cross member 5 come into contact with the dash cross member 10 and the dash cross member 10 prevents the radiator 9 from moving. In this manner, the upper cross member 7, the lower cross member 5, the dash cross member 10 and the radiator 9 absorb the impact efficiently, so that entry into the room can be prevented. Further, since the radiator 9 has a long shape in the vertical direction, the radiator 9 is stretched between the dash cross member 10 and the lower portion of the relatively rigid dash panel 2 by the rearward movement of the vehicle body. The movement of car body parts can be received. Furthermore, since the radiator 9 abuts against the front surface of the dash panel 2 over a relatively large area and is received by the dash panel 2, the radiator 9 can efficiently absorb an impact and prevent entry into the room. 2 local deformation can be prevented, and the influence on the indoor space can be suppressed.

As described above, according to the above embodiment, the load applied from the front is received by the upper cross member 7 and the lower cross member 5, but the lower cross member 5 is supported by the side frame 6 at the vehicle side portion. Since the upper cross member 7 is supported by the support member 8, the deformation is suppressed, and the deformation is suppressed by being supported by the radiator 9 in the center of the vehicle. With this configuration, it is possible to receive an impact load on a wide surface without unnecessarily increasing the rigidity of each cross member 7, 5, 10. Further, the dash cross member 10 suppresses the backward movement of the radiator 9 and also suppresses deformation of the dash panel 2. Further, since the upper cross member 7, the lower cross member 5, and the dash cross member 10 are arranged in a range from the upper end to the lower end of the radiator 9 in the vertical direction of the vehicle, Thus, the upper cross member 7 and the lower cross member 5 that have been retracted by the deformation force from the can be reliably brought into contact with the radiator 9. Thus, deformation in front of the vehicle can be suppressed.
Since the height position of the upper cross member 7 is a height position near the center of the radiator 9 and the height position of the dash cross member 10 is a height position near the upper end of the radiator 9, the rear side of the vehicle The pressure receiving range can be expanded, and the deformation force can be received in a wide range, and local deformation is suppressed.

  In addition, this invention is not limited only to the said embodiment, For example, the expansion part 5a of the lower cross member 5 can set a magnitude | size arbitrarily as needed. In addition, it goes without saying that the present invention can be implemented with appropriate modifications within a range not changing the gist of the present invention.

It is a perspective view which shows the front part structure of the vehicle by embodiment of this invention. It is a front view of FIG. It is CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 2 Dash panel 3 Front hood 4 Front bumper 5 Lower cross member 5a Enlarged part 6 Side frame 7 Upper cross member 8 Support member 9 Radiator 10 Dash cross member 11 Wheel

Claims (3)

A front structure of a vehicle in which an engine is arranged at the bottom of the floor,
A dash panel that divides the front body space and the passenger compartment space at the front of the vehicle;
A front bumper disposed at the front end of the vehicle;
A radiator disposed in the front body space between the front bumper and the dash panel;
In the front structure of the vehicle having a lower cross member disposed between the front bumper and the radiator and attached to a front end of a side frame and disposed in a vehicle width direction ,
An upper cross member disposed in the vehicle width direction in front of the radiator;
Provided dash cross member that constitutes the closed cross-section to the rear the dash panel by joining both side flanges cooperate with the dash panel of the radiator in the vehicle width direction,
The upper cross member, the lower cross member, and the dash cross member are arranged within a range of height from the upper end to the lower end of the radiator in the vertical direction of the vehicle,
When an impact load from the front acts on the front surface of the vehicle body and the load is transmitted to the upper cross member and the lower cross member via the front bumper and starts moving to the rear of the vehicle body,
The upper cross member and the lower cross member abut against the radiator;
Furthermore, move to the rear of the vehicle with the radiator,
The radiator contacts the dash cross member;
The vehicle front structure, wherein the radiator is in a state of being stretched between the dash cross member and a lower portion of the dash panel, and receives the movement of the vehicle body parts from the front. The height position of the upper cross member is an intermediate position of the radiator or a height position higher than the radiator, and the height position of the dash cross member is a height position crossing the rear side of the upper end portion of the radiator. The vehicle front structure according to claim 1 . The vehicle front structure according to claim 2, wherein both ends of the lower cross member in the vehicle width direction extend outward in the vehicle width direction so as to overlap the front wheels when viewed from the front-rear direction of the vehicle body. .

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