JPH07187009A - Body front structure of automobile - Google Patents

Abstract

PURPOSE:To provide a body front structure of automobile which can prevent torsional deformation completely without increasing the thickness of a plate or adding a reinforcing member. CONSTITUTION:The general part 14 of a radiator core upper 13 is jointed to the upper end part of a radiator core side 9 at which a forward flange 9b is formed to form the second closed cross sectional part H2 which runs in a vehicle width direction X. A horizontal part 11 is formed toward the inside from the upper end of the front end part of a hood ridge lower 10. The front end 11a of the horizontal part 11 is connected to the radiator core side 9. A longitudinal surface part 18 which is formed downwards from the inside end of both the end parts 15 of the radiator core upper 13 is connected to the horizontal part 11 of the hood ridge lower 10. It is thus possible to form the third closed cross sectional part H3 which is jointed to the first closed cross sectional part H1 of the side part of a vehicle body and is in a continuous condition to the second closed cross sectional part H2.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional vehicle body front structure,
For example, there is one as shown in FIG. 5 (for a similar technique, see Japanese Utility Model Laid-Open No. 13888/1990).

Reference numeral E denotes an engine room, and hood ridge lowers 1 are arranged on both left and right sides of the engine room E along the front-rear direction Y. This Hood Ridge Roar 1
A hood ridge upper (not shown) is connected to the upper part of the hood, and a hood ridge reinforcement 2 is further connected to the hood ridge upper. The hood ridge 2 and the hood ridge upper (not shown) form a first closed cross section H ₁ along the front-rear direction Y. Further, the hood ridge lower 1 is formed with a strut housing 3 which is projected to the engine room E side, and the strut portion 4 of the suspension is installed in the strut housing 3. The strut portion 4 is mounted in an inclining state, that is, in a state in which the upper side is inclined toward the engine room E side by a constant angle θ with respect to the vertical due to a request for suspension performance.

Reference numeral 5 denotes a radiator core upper, which is composed of a general portion 6 along the vehicle width direction X and both end portions 7 which are bent rearward, and is attached to the upper end portion of the radiator core side 8. There is. The general portion 6 of the radiator core upper 5 has a hat-shaped cross section, but both end portions 7 have a flat plate shape. The both end portions 7 are spot-welded S at two points, and the upper surface of the hood ridge reinforcement 2 is formed. Is connected to.

The rigidity of the general portion 6 and both end portions 7 of the radiator core upper 5 must be sufficiently high. This is because, due to the inclination of the strut portion 4 as described above, the road surface load from the tire transmitted to the strut portion 4 is applied as a directional force pushing the strut housing 3 toward the engine room E side, and the strut portion 4 Since the inclining force F from the above is applied to the general portion 6 of the radiator core upper 5 and the joint portion of both end portions 7 via the hood ridge reinforcement 2 etc., the rigidity of these portions is low, and as a result, The movement of the Hood Ridge Reinforce 2 or the like toward the engine room E cannot be restricted, and deformation in the twisting direction may occur at the front part of the vehicle body, resulting in deterioration of steering stability and noise and vibration resistance. . Further, the radiator core side 8 is also deformed so as to be twisted in accordance with the twist of the front portion of the vehicle body.
This is because the head lamp (not shown) held in the position may cause optical axis deviation. Furthermore, the radiator core side 8 may cause membrane vibration at a constant frequency, which may cause noise (muffled sound).

In particular, the general portion 6 of the radiator core upper 5
Has a hat-shaped cross section, and when an external force is applied, a force is applied so as to widen this cross-sectional shape. Therefore, in order to satisfy the above requirements for rigidity, the plate thickness of the general part 6 is sufficiently increased. Alternatively, rigidity measures such as adding a reinforcing member to the general portion 6 are taken. Further, the both end portions 7 of the radiator core upper 5 are also flat plate-shaped and easily deformed, so that more sufficient rigidity measures than the general portion 6 are required.

[0007]

However, as a measure against rigidity, it is not possible to sufficiently increase the plate thickness of the general portion 6 and both end portions 7 of the radiator core upper 5 or to add a reinforcing member to those portions. However, there is a great disadvantage in terms of weight and cost, so that improvement is desired.

The present invention has been made by paying attention to such a conventional technique, and it is possible to surely prevent the twisting deformation without increasing the plate thickness or adding a reinforcing member. A front structure is provided.

[0009]

In the vehicle body front structure according to the present invention, the hood ridge upper connected to the upper end of the hood ridge lower and the hood ridge reinforcement have a first closed cross section along the front-rear direction. The radiator core upper is formed, and the radiator core upper is arranged along the vehicle width direction, and both end portions are bent backward and the outer end is joined to the inner end of the hood ridge upper or the hood ridge reinforcement. A vehicle body front structure formed from, and a general portion of the radiator core upper,
A second closed cross-section portion along the vehicle width direction is formed by being joined to the upper end portion of the radiator core side on which the forward facing flange is formed,
A horizontal portion is formed from the upper end of the hood ridge lower front end portion toward the inside, and the front end of the horizontal portion is connected to a radiator core side, and a vertical surface portion formed downward from the inner end of both ends of the radiator core upper is formed. By connecting to the horizontal portion of the hood ridge lower, a third closed cross-section portion is formed which is connected to the first closed cross-section portion and is continuous with the second closed cross-section portion.

[0010]

According to the present invention, the general portion of the radiator core upper portion and the upper end portion of the radiator core side form a second closed cross section along the vehicle width direction, and both end portions of the radiator core upper portion and the hood ridge lower portion are formed. A third closed cross-section portion is formed between the horizontal portion and the front-rear direction, and a second closed cross-section portion along the vehicle width direction and the vehicle body side portion along the front-rear direction are formed through the third closed cross-section portion. Since the first closed cross-section portion formed as described above is coupled, the strength of the front portion of the vehicle body is improved, and twisting of the front portion of the vehicle body is reliably prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to FIGS.
It will be described based on. It should be noted that the description overlapping with the conventional one is omitted.

Reference numeral 9 denotes a radiator core side, which has an opening 9a for mounting a lamp, and a forward facing flange 10b is formed at the upper end. 10 is Hood Ridge lower
The crank end has a crank shape, and a front end flange 10a is joined to the radiator core side 9. Further, from the upper end of the front end of the hood ridge lower 10, a horizontal portion 11 having a substantially triangular shape is formed toward the inner side in the vehicle width direction X, and a front end flange 11a formed on the horizontal portion 11 is attached to the radiator core side 9. Connected. An opening 11b for work is formed in the horizontal portion 11 having a substantially triangular shape.

A hood ridge upper 12 having an L-shaped cross section is joined to the upper outer surface of the hood ridge lower 10, and a front end flange 12a thereof is joined to the radiator core side 9.

A radiator core upper 13 is composed of a general portion 14 along the vehicle width direction X and both end portions 15 bent backward from the general portion 14. General department 1
Reference numeral 4 denotes a substantially hat-shaped cross section, in which a front end flange 16a formed at the lower end of the front surface portion 16 is joined to a forward facing flange 9b of the radiator core side 9. Also, the front portion 1
The rear surface portion 17 in a state of being extended below 6 is joined to the upper rear surface of the radiator core side 9, and a rearward facing rear end flange 17a is formed at the lower end of the rear surface portion 17. Therefore, the general portion 14 and the upper end portion of the radiator core side 9 form the second closed cross-section portion H ₂ along the vehicle width direction X.

Both ends 15 have a shape substantially corresponding to the horizontal portion 11 formed on the hood ridge lower 10, and the outer ends 15a thereof are joined to the inner flange 12b of the hood ridge upper 12. At its inner end, a vertical surface portion 18 is formed downward from the rear surface portion 17 of the general portion 14 continuously. The vertical surface portion 18 is formed with a flange 18a which is continuously formed from the rear end flange 17a.
8a is joined to the inner end of the horizontal portion 11. Therefore,
A third closed cross section H ₃ is formed between the both ends 15 and the horizontal section 11 and extends from the second closed cross section H ₂ in the front-rear direction Y.

A hood ridge reinforcement 19 has an L-shaped cross section opposite to the hood ridge upper 12, and its outer flange 19a is joined to the outer end of the hood ridge upper 12 and its inner end is joined. Both ends 15
From the outer end 15a of the hood ridge to the inner flange 12b of the hood ridge upper 12, and the front end flange 19
b is joined to the radiator core side 9. Therefore,
Due to the hood ridge reinforcement 19 and the hood ridge upper 12, a first closed cross section H along the front-rear direction Y is obtained.
₁ is formed.

The first closed cross-section portion H ₁ and the third closed cross-section portion H ₃ are firmly connected to each other in a state where they are adjacent to each other with the hood ridge upper 12 as a partition wall and the hood ridge upper 12 is a common member. Therefore, after all (see FIG. 3), the second closed cross section H ₂ along the vehicle width direction X and the first closed cross section H ₁ along the front-rear direction Y are connected via the third closed cross section H _3. It will be in the state of being. Therefore, for example, the food ridge upper 1
2 and the like, even if an inward external force F (see FIG. 1) is applied from a suspension (not shown), the radiator core upper 1
3 does not bend, and twisting of the front portion of the vehicle body is reliably prevented.

As described above, since the twist in the front portion of the vehicle body does not occur, the steering stability and noise and vibration resistance performance are improved, and the radiator core side 9 is not twisted, so that the headlamp may shake the optical axis. Nor. Further, the radiator core side 9 does not cause a film vibration, and noise (a muffled sound) does not occur.

In addition, the second closed cross section H along the vehicle width direction X
₂ and the first closed cross-section portion H ₁ and the third closed cross-section portion H ₃ along the front-rear direction Y are connected to each other, and thus each member involved in each closed cross-section portion H ₁ , H ₂ , H ₃ Since the rigidity of each member is increased, the bending of each member is reduced and the mounting accuracy between each member is also improved.

In this embodiment, the outer ends 15a of both ends 15 of the radiator core upper 13 are joined to the inner flange 12b of the hood ridge upper 12, but they are joined to the upper surface of the inner end of the hood ridge reinforcement 19. You may do it.

[0021]

The vehicle body front structure according to the present invention has the contents described above, and includes the second closed cross-section portion along the vehicle width direction and the front and rear portions formed on the vehicle body side portion. The first closed cross section along the direction is connected by the third closed cross section formed between both ends of the radiator core upper and the horizontal part of the hood ridge lower, so that the twisting deformation of the front part of the vehicle body is surely performed. To be prevented. Therefore, there is no need to increase the plate thickness of the radiator core upper or add a reinforcing plate as in the conventional case, which is very advantageous in terms of weight and cost.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a portion corresponding to a line SA-SA shown by an arrow in FIG.

FIG. 3 is a sectional view of a portion corresponding to a line SB-SB indicated by an arrow in FIG.

FIG. 4 is a cross-sectional view of a portion corresponding to a line SC-SC indicated by an arrow in FIG.

FIG. 5 is a perspective view showing a conventional vehicle body front structure.

[Explanation of symbols]

9 Radiator core side 10 Hood ridge lower 11 Horizontal part 12 Hood ridge upper 13 Radiator core upper 14 General part 15 Both ends 18 Vertical surface part 19 Hood ridge reinforce H ₁ 1st closed cross section H ₂ 2nd closed cross section H ₃ No. 3 closed section

Claims (1)

[Claims] 1. A hood ridge upper connected to the upper end of the hood ridge lower and a hood ridge reinforcement form a first closed cross section along the front-rear direction, and the radiator core upper extends along the vehicle width direction. A front structure of a vehicle body, comprising: a general portion to be disposed and both end portions which are bent backward and whose outer ends are joined to the inner ends of the hood ridge upper or the hood ridge reinforcement. A general closed portion of the radiator core upper is joined to an upper end portion of a radiator core side formed with a forward-facing flange to form a second closed cross-section portion along a vehicle width direction, and an inner side from an upper end of the hood ridge lower front end portion is formed. A horizontal portion is formed toward the radiator core side, and the front end of the horizontal portion is connected to the radiator core side, and is formed downward from the inner ends of both ends of the radiator core upper. By connecting the vertical surface portion to the horizontal portion of the hood ridge lower, a third closed cross-section portion connected to the first closed cross-section portion and continuous with the second closed cross-section portion is formed. Front structure of the car body.