JPH0585412A - Front part body structure of automobile - Google Patents

Abstract

PURPOSE:To secure rigidity, improve the ventilation performance to a radiator, and improve the radiator performance, in a structure in which the radiator is positioned behind a frame being composed of cross members, etc., on the car front side. CONSTITUTION:A radiator 6 is positioned on the car rear side of a cross member 1, and these cross member 1 and radiator 6 are arranged so that the parts in a certain range of the heat receiving parts of these member 1 and radiator 6 lap over in the longitudinal direction, and an air blow hole 18 which penetrates in the longitudinal direction is formed at the part of the cross member 1 positioned in front of the heat receiving part of the radiator 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front body structure of an automobile equipped with a vehicle front frame composed of a cross member and the like and a heat exchanger.

[0002]

2. Description of the Related Art Conventionally, a vehicle front frame 100 is composed of a cross member 101 located in the lower front part of the vehicle and extending in the vehicle width direction, a shroud upper member located above the cross member 101, and left and right shroud panels. ,
A radiator (heat exchanger) 1 is provided behind the frame 100.
A front body structure of an automobile to which the 06 is assembled is known (see FIG. 9).

[0003]

In a vehicle equipped with this type of front body structure, as shown in FIG. 9, an approach angle (horizontal plane) for preventing interference with the lower field of view (line a) and the road surface is provided. In order to satisfy the requirement of the angle of the line b with respect to the vertical direction, the vertical dimension of the vehicle front frame 100 and the radiator 106 is limited within a certain range. On the other hand, in order to secure a heat receiving area, the vertical dimension of the radiator 106 is required to be as large as possible. However, if the size of the radiator 106 is increased within the above-mentioned limit, the lower constant range of the heat receiving portion of the radiator 106 is reduced. Since it wraps with the cross member 101 and the cross member 101 blocks ventilation to the heat receiving portion at this lap portion, it hinders improvement of cooling efficiency. Further, for example, if the cross member 101 is removed, it becomes difficult to secure the rigidity required for the vehicle front frame.

Japanese Patent Laid-Open No. 63-255188 discloses a structure in which a cross member is abolished and, instead, a left and right front side frames are connected by a U-shaped frame to ensure rigidity. ing. But,
Even with this structure, there is a problem that the frame located in front of the radiator obstructs ventilation to the radiator under the constraints of the above-mentioned downward field of view and approach angle.

In view of the above circumstances, the present invention is provided with a cross member in the lower portion on the front side of the vehicle to ensure rigidity and to increase the heat exchanger height within a range satisfying the requirements for the lower view area and approach angle. (EN) Provided is a front vehicle body structure of an automobile capable of increasing ventilation in a portion where a front cross member of the heat exchanger is located and increasing waste heat performance of the heat exchanger while increasing the dimension in the depth direction. The purpose is to

[0006]

To achieve the above object, according to the present invention, a cross member extending in the vehicle width direction is provided at a front portion of a vehicle, and a heat exchanger is provided on the vehicle rear side of the cross member. In the front vehicle body structure of the arranged vehicle, the cross member and the heat receiving portion of the heat exchanger are arranged such that they overlap each other in the front and rear, and the heat exchanger of the cross member is arranged. The structure is provided with a ventilation hole penetrating in the front-rear direction in a portion located in front of the heat receiving portion.

In this structure, the cross member is
It is preferable that at least a predetermined range corresponding to the heat receiving portion of the heat exchanger has an open cross-sectional shape, and the ventilation hole is provided in a portion of the open cross-sectional shape. Further, it is preferable that closed cross sections are formed at both ends of the cross member. Further, it is preferable that a cab mount bracket, which is connected to a frame to which the suspension is assembled via a cab mount, is coupled to the closed cross section.

A shroud upper member extending parallel to the cross member in the vehicle width direction is provided above the cross member, and a center for connecting the cross member and the shroud upper member is provided substantially at the center in the vehicle width direction. A stay is provided, and the center stay is joined to both upper and lower side walls of the open cross-section portion of the cross member, so that a closed cross section is formed at the center stay joining portion of the open cross-section portion of the cross member. Is preferred.

[0009]

According to the above construction, the rigidity of the vehicle front side frame is ensured by the cross member, and the ventilation hole provided in the cross member allows the cross member and the heat exchanger to pass through the ventilation hole even at the overlapping portion. Traveling wind is sent to the heat exchanger.

If ventilation holes are provided in the portion of the cross member having the open cross-sectional shape, ventilation to the heat exchanger is enhanced. Further, if closed cross sections are formed at both ends of the cross member, the rigidity of this portion is increased. If the cab mount bracket is connected to this portion, the support strength against the load applied via the suspension is increased. Further, if the center stay is connected to the central portion of the open cross-sectional shape portion of the cross member and the closed cross-section portion is formed at this center stay joint portion, the rigidity of this portion is also secured.

[0011]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows an entire front body structure of an automobile according to an embodiment of the present invention. As shown in this figure, there is a cross member (No1 cross member) on the front side of the vehicle.
1, shroud panel 2, shroud upper member 3,
The shroud side member 4 and the center stay 5 are arranged, and these constitute a vehicle front side frame. A radiator 6 as a heat exchanger is attached to the vehicle rear side of this frame.

The cross member 1 is located in the lower front portion of the vehicle and extends in the vehicle width direction. As shown in FIGS. 2 and 3, the cross member 1 is formed to have a substantially U-shaped cross section that is open to the rear and has flanges on both upper and lower side walls 1a and 1b. A shroud upper member 3 is arranged above the cross member 1 at a predetermined distance from the cross member 1, and the shroud upper member 3 also extends in the vehicle width direction. Then, the shroud panels 2 are arranged on both left and right sides between the cross member 1 and the shroud upper member 3, and the shroud side members 4 are arranged inside thereof. The inner portion of the shroud panel 2 is welded to the outer surface of the shroud side member 4, and the lower end portions of these are joined to the cross member 1 by welding. Both ends of the cross member 1 have a closed cross section by welding the lower ends of the shroud panel 2 and the shroud side member 4 (see FIG. 7).

The shroud upper member 3 is joined to the shroud upper member 3 by welding its front flange to the upper ends of the shroud panel 2 and the shroud side member 4. In addition, at the end of the cross member 1,
A curved connecting portion 7 is continuously provided along the outer side portion of the shroud panel 2, the outer side portion of the shroud panel 2 is welded to the back surface of the connecting portion 7, and the shroud upper is attached to the tip of the connecting portion 7. The end of the member 3 is welded. A wheel apron 8 and an apron lane hosement 9 are disposed on the side of the vehicle body behind the shroud panel 2 and extend in the front-rear direction of the vehicle body. It is welded to the joint with 2.

2 to 7 show specific structures of the cross member 1, the center stay 5, the radiator 6 and the mounting portions thereof. As shown in FIGS. 3 and 4,
The radiator 6 is located behind the cross member 1 and its lower end reaches below the cross member 1, so that a part of a certain range below the heat receiving portion overlaps with the cross member 1 in the front and rear direction. Then, the brackets 11 and 12 are welded to the radiator 6 at two upper and lower positions on both sides,
The brackets 11 and 12 are the shroud side members 4
To the bolts 15 and 1 via the rubber mounts 13 and 14.
The radiator 6 is attached by being fastened at 6 (see FIGS. 4 to 6).

Since the cross member 1 has the U-shaped cross section as described above, the predetermined range corresponding to the heat receiving portion of the radiator 6 has an open cross sectional shape except for the joint portion of the center stay 5. On the front wall of this open section,
A plurality of ventilation holes 18 penetrating in the front-rear direction are arranged at appropriate intervals (see FIGS. 1 and 2).

The center stay 5 has its upper end welded to the shroud upper member 3 via a bracket, and its lower end welded to the upper and lower side walls 1a, 1b of the open cross-section of the cross member 1. As a result, a closed cross section is formed at the joint of the center member 5 of the cross member 1. That is, both ends of the cross member to which the shroud panel 2 and the shroud side member 4 are joined and a central portion of the cross member to which the center stay 5 is joined have a closed cross section, and the cross member 1 has an open cross section in other portions. ing. The center stay 5 also has a radiator 6
It is desirable to provide a ventilation hole 19 for the. Further, at the joint between the center stay 5 and the cross member 1,
Ventilation holes may be provided over both.

A cab mount bracket 21 is joined to both ends of the cross member 1 to which the shroud panel 2 is joined to form a closed cross section. This cab mount bracket 21, as shown in FIG.
It is welded to the rear surface of the shroud panel 2 while protruding rearward. Then, a chassis frame (not shown) to which the suspension is assembled is connected via a cab mount 22 made of an elastic material such as rubber and a chassis bracket 23 provided on the chassis frame.

According to the structure of this embodiment, since the ventilation holes 18 are arranged in a predetermined area of the cross member 1 located in front of the radiator 6, the cross member 1 and the radiator 6 have a constant area. Also in the portion where the laps wrap, the traveling wind is blown by the above-mentioned ventilation holes 1 as shown by the arrow in FIG.
It is sent to the radiator 6 through 8 and the cooling performance is enhanced.

In this case, a predetermined range of the cross member 1 corresponding to the heat receiving portion of the radiator 6 has an open sectional shape,
Since the ventilation holes 18 are provided here, traveling wind is smoothly sent to the radiator 6. In other words, it is possible to provide ventilation holes at the corresponding positions of the front and rear walls as a closed cross-sectional shape, but if this is done, turbulence or the like is likely to occur inside the closed cross section. 18
It is better to provide the ventilation.

Further, both ends of the cross member 1 have a high rigidity due to the closed cross section formed by joining the shroud panel 2 and the shroud side member 4, and the cab mount bracket 21 is joined to this portion. Therefore, the load applied via the suspension is supported by the portion having high rigidity. Further, since the center stay 5 is joined to the central portion of the cross member 1 to form a closed cross section, the rigidity of the entire cross member 1 is sufficiently ensured.

That is, as the connecting structure of the cross member and the center stay, the center stay is generally connected to the upper surface of the cross member in the prior art. The stay connecting portion also has an open cross section, so that it is difficult to secure rigidity against bending load, etc., which will be described later. In comparison with this, in the structure of the present embodiment, a closed cross section is formed at the center stay connecting portion, which results in bending load. The rigidity with respect to the like can be enhanced, and the occurrence of cracks and the like can be prevented. More specifically, as shown in FIG. 8, in the cross member 1, the forces P1 and P2 acting on the cab mount bracket 21 via the suspension are applied upward to both ends, and the force P3 from the center stay 5 is applied. A bending load acts around the center stay 5 by being applied downward to the central portion.
Further, when the forces P1 and P2 applied to both ends are different, the center line of the cross member 1 and the cab mount bracket 21
The torsion moment of | P1 × L−P2 × L | On the other hand, when the center stay connecting portion has a closed cross section, a structure that sufficiently withstands the bending load and the torsion moment can be obtained.

By increasing the rigidity at both ends and the central portion in this manner, sufficient strength can be obtained as the entire vehicle front frame.

[0023]

According to the structure described in claim 1, the cross member and a part of the heat receiving portion of the heat exchanger overlap with each other in the front and rear, and at the same time, the heat receiving portion of the heat exchanger of the cross member is formed. Since a vent hole that penetrates in the front-rear direction is provided in the front part, the heat receiving area of the heat exchanger can be made large while the heat receiving area of the heat exchanger is large within the range that satisfies the requirements for the downward view area and the approach angle. Even in the portion where the heat exchanger is overlapped with the heat exchanger, the ventilation of the traveling air to the heat exchanger can be improved, and the cooling performance can be improved.

In this structure, as described in claim 2, the cross member has an open cross section at least in a predetermined range corresponding to the heat receiving portion of the heat exchanger, and the ventilation hole is provided in the open cross section. With the provision of, the ventilation of this part becomes very good.

Further, when the closed cross section is formed at both ends of the cross member as described in claim 3, it is possible to sufficiently secure the rigidity of the cross member at both ends.

Further, when a cab mount bracket is connected to the closed cross-section portions of both ends of the cross member as described in claim 4, the load applied to the cab mount bracket via a suspension or the like is applied to the cab mount bracket. ,
It can have sufficient strength.

According to a fifth aspect of the present invention, there is provided a center stay for connecting the cross member and the shroud upper member above the cross member, and the center stay is provided on both upper and lower side walls of the open cross-sectional shape portion of the cross member. When the closed cross section is formed in this portion by joining, the rigidity of the central portion of the cross member is increased, so that the cross member can have sufficient strength against bending load and the like.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an overall structure of a front body structure of an automobile according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view around a central portion of a cross member in the structure.

FIG. 3 is an enlarged cross-sectional view of a ventilation hole forming portion of a cross member in the structure.

FIG. 4 is a schematic cross-sectional view of a heat exchanger mounting portion in the structure.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a schematic cross-sectional view of a cab mount bracket attachment portion in the same structure.

FIG. 8 is an explanatory diagram showing a force acting on a cross member.

FIG. 9 is an explanatory diagram showing a problem of the conventional technique.

[Explanation of symbols]

 1 cross member 2 shroud panel 3 shroud upper member 4 shroud side member 5 center stay 6 radiator 18 ventilation hole 21 cab mount bracket

Claims (5)

[Claims] 1. A front body structure of an automobile, wherein a cross member extending in a vehicle width direction is provided at a front portion of a vehicle, and a heat exchanger is arranged on a vehicle rear side of the cross member. These are arranged so as to wrap back and forth with a certain range of the heat receiving part of the heat exchanger, and penetrate through the part of the cross member located in front of the heat receiving part of the heat exchanger in the front-rear direction. A front body structure of an automobile, which is provided with ventilation holes. 2. The cross member has an open cross-sectional shape at least in a predetermined range corresponding to the heat receiving portion of the heat exchanger,
The front vehicle body structure for an automobile according to claim 1, wherein the ventilation hole is provided in the portion having the open cross-sectional shape. 3. The front vehicle body structure for an automobile according to claim 2, wherein closed cross sections are formed at both ends of the cross member. 4. The front body of an automobile according to claim 3, wherein a cab mount bracket connected to a frame to which a suspension is assembled is connected via a cab mount to closed cross-section portions of both ends of the cross member. Construction. 5. A shroud upper member extending parallel to the cross member in the vehicle width direction is provided above the cross member, and a center for connecting the cross member and the shroud upper member is provided substantially at the center in the vehicle width direction. A stay is provided, and the center stay is joined to both upper and lower side walls of the open cross-section portion of the cross member, so that a closed cross section is formed at the center stay joining portion of the open cross-section portion of the cross member. Claims 2 to 4
The front body structure of the automobile according to any one of 1.