JP3452195B2 - Body front structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front bumper whose center is curved forward at the front of a front cross member provided at a front end of a pair of side members of a chassis frame. The front structure of the vehicle body. 2. Description of the Related Art As shown in FIG. 4, a chassis frame 1 of a truck includes a pair of side members 3, 3 extending in the direction of the truck and arranged in parallel with each other. The engine 2 is mounted. A pair of side members 3,3
A front cross member 4 is erected at the front end of the engine 2 and the engine 2 is mounted on the pair of side members 3, 3 via front and rear engine mount brackets 8, 8, 9, 9.
Placed between. The conventional front cross member 4 is made of channel steel, and a front bumper 5 whose center is curved forward is provided in front of the front cross member. On the other hand, behind the front cross member 4, a radiator 6 for releasing the heat from the cooling water circulating and cooling the engine 2 to the atmosphere is provided.
Is provided. Since the front cross member 4 is located at the front part of the vehicle body, it is necessary to secure rigidity against an impact from the front of the vehicle. However, in recent years, the performance of the truck has been increased, and the number of mounted devices at the front portions of the pair of side members 3, 3 has been increased, and the radiator 6 has been moved forward to accommodate the device accommodation space. The demand that should be expanded. In order to move the radiator 6 to the front of the vehicle, it is conceivable to move the mounting position of the front cross member 4 to the pair of side members 3 and 3 forward. However, moving the mounting position forward is difficult because the front cross member 4 comes into contact with a portion other than the center of the front bumper 5 provided in front thereof. Even if the front cross member 4 can be moved, the rigidity of the front cross member 4 is reduced due to a decrease in the joint area with the pair of side members 3. In order to solve this problem, it is conceivable to cut off the front cross member 4 at a portion that comes into contact with the radiator 6 moved forward. However, local cutting of the front cross member 4 is performed by rigidity of the front cross member 4 itself. There is a problem that lowers. An object of the present invention is to provide a front structure of a vehicle body capable of expanding a device accommodation space in a front portion of the vehicle body while securing necessary rigidity. [0005] The invention according to claim 1 is:
As shown in FIG. 1, a chassis frame 11 having a pair of side members 16, 16 and a front cross member 17 erected at front ends of the pair of side members 16, 16.
The front structure of a truck body provided with a front bumper 21 whose center is curved forward in front of the front cross member 17 of FIG. Its characteristic configuration is shown in FIG.
As described above, the pair of side members 16 is
The first upper flanges respectively connected to the upper and lower ends of the
It has a flange 16b and a first lower flange 16c.
Of the front side wall 17a and the front side wall 17a.
Second upper flange 1 connected to upper end and lower end respectively
7b and a second lower flange 17c.
Are formed by bending both ends of the central portion of the flat plate rearward and bulging the center forward along the rear surface of the front bumper 21. Both ends of the second upper flange 17 b and the second lower flange are formed.
At both ends of the flange 17c, an upper reinforcing flange 17d and a lower
The side reinforcing flanges 17e are respectively provided in series, and the upper reinforcing flanges 17e are provided.
The flange 17d and the lower reinforcing flange 17e are connected to the first upper flange.
The front lower surface of the flange 16b and the first lower flange 16
c is fixed to the upper surface of the front end . According to the first aspect of the present invention, the central portion of the front cross member 17 is made larger than the conventional one by expanding the front wall 17a of the front cross member 17 forward at the center along the rear surface of the front bumper 21. Move forward. By moving the radiator 22 forward by this amount of movement, the device accommodation space in that portion can be enlarged. Also, front cross member 1
If the cross-sectional area of the front cross member 7 is the same as that of the related art, the rigidity of the front cross member 17 itself does not decrease, and if the cross-sectional area is increased as compared with the related art, the rigidity can be increased as compared with the related art. [0007] [0008] Before the second upper flange 17b and the second lower flange 17c is swelled central forward sidewall 17
Since a is reinforced, a predetermined rigidity of the front cross member 17 itself can be secured. Further, the upper reinforcing flange 17d and the lower reinforcing flange 17
e is fixed to the lower surface of the first upper flange 16b and the upper surface of the first lower flange 16c, respectively, so that the joint area of the front cross member 17 to the pair of side members 16 can be sufficiently ensured, and the joint area can be reduced. It is possible to avoid a decrease in rigidity due to the decrease. Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 3, a cab 12 is provided above a front portion of a chassis frame 11 of the truck 10. The cab 12 is configured to be tiltable with respect to the chassis frame 11, and inside the cab 12, a seat 12a on which an occupant sits, a steering wheel 12b for steering the truck 10, and the like are provided. An engine 13 is mounted on a chassis frame 11 below the cab 12, and a transmission 1 is mounted on a rear end of the engine 13 via a clutch 14a.
4 are connected. As shown in FIG. 1, the chassis frame 11 has a pair of side members 16 extending in the track traveling direction. A pair of side members 1
The front cross members 6 and 16 extend in the traveling direction and are arranged in parallel with each other. A pair of side members 1 below the cab 12
Front engine mount bracket 1 for 6 and 16
8, 18 and rear engine mount bracket 19, 1
9 are fixed at predetermined intervals in the traveling direction of the truck, and the engine 13 is connected to the pair of side members 16, 1 via the front engine mount brackets 18, 18 and the rear engine mount brackets 19, 19.
6 are arranged. On the other hand, a front bumper 21 is provided in front of the front cross member 17 at a predetermined interval from the front cross member. The front bumper 21 has a pair of side members 1 by a mounting bracket (not shown).
The front bumper 21 itself is attached to the front end of each of the front bumpers 6 and 16, and the center of the front bumper 21 is curved forward. Here, since the pair of side members 16, 16 has a symmetrical structure, one side member 16 will be described. As shown in FIG. 2, the side member 16 is formed in a channel shape, and the outer wall 16a and the outer wall 16a are formed. It has a first upper flange 16b connected to the upper end of the outer wall 16a and a first lower flange 16c connected to the lower end of the outer wall 16a. Returning to FIG. 1, the front cross member 17
The front wall 17a is formed so that the center thereof bulges forward so that the front side wall 17a is along the rear surface of the front bumper 21. As shown in FIGS. 1 and 2, the front cross member 17 in this embodiment is formed in a U-shaped cross section by pressing a steel plate, and has a front side wall 17a and the front side wall 17a.
A second upper flange 17b and a second lower flange 17c connected to the upper end and the lower end of the second flange. By connecting the second upper flange 17b and the second lower flange 17c to the upper end and the lower end of the front wall 17a, the front cross member 17 is configured to be able to secure a predetermined rigidity. An upper reinforcing flange 17d and a lower reinforcing flange 17e are respectively connected to both ends of the second upper flange 17b and both ends of the second lower flange 17c. The upper reinforcing flange 17d and the lower reinforcing flange 17e are formed integrally when the front cross member 17 is pressed, and the upper reinforcing flange 17d extends along the lower surface of the first upper flange 16b of the side member 16 to provide lower reinforcing. The flange 17e is the first member of the side member 16.
The lower flange 16c is configured to be along the upper surface. The upper reinforcing flange 17d and the lower reinforcing flange 17e
To the first upper flange 16b of the side member 16 respectively.
The front cross member 17 is fixed to the side member 16 by performing welding such as plug (plug) welding or fillet welding on the first lower flange 16c. In the front structure of the vehicle body constructed as described above, the front cross member 17 is formed by bulging the center forward so that the front side wall extends along the rear surface of the front bumper 21. The central portion of the front cross member 17 can be moved forward as compared with the related art while avoiding the situation of contact with the front bumper 21. For this reason, it is possible to move the radiator 22 shown by a dashed line in FIG. 1 forward, and it is possible to enlarge the device accommodation space in that portion with the movement.
If the cross-sectional area of the front cross member 17 is the same as the conventional one, the rigidity of the front cross member 17 itself does not decrease, and if the cross-sectional area is increased, the rigidity can be increased as compared with the conventional one. The front cross member 17 has a front wall 17a having a center curved forward, and a second upper flange 17b connected to the upper and lower ends of the front wall 17a.
And the second lower flange 17c, the predetermined rigidity of the front cross member 17 itself can be secured, and the upper reinforcing flange 17d and the lower reinforcing flange 17e connected to both ends thereof are connected to the first upper flange 16b. Of the front cross member 17 and the upper surface of the first lower flange 16c, the joint area of the front cross member 17 with respect to the pair of side members 16 and 16 can be sufficiently ensured, and the rigidity due to the decrease in the joint area can be increased. Drops can be avoided. In the above embodiment, an example in which the upper reinforcing flange 17d and the lower reinforcing flange 17e are welded to the lower surface of the first upper flange 16b and the upper surface of the first lower flange 16c, respectively, has been described. However, the fixing may be performed by fixing means such as riveting or bolting. As described above, according to the present invention, the front cross member is formed by bulging the center of the front wall forward so that the front side wall follows the rear surface of the front bumper.
The central portion of the front cross member moves forward in comparison with the related art. For this reason, it becomes possible to move the radiator forward, and the movement of the radiator makes it possible to enlarge the device accommodation space in that portion. Further, if the cross-sectional area of the front cross member is the same as that of the related art, the rigidity of the front cross member itself does not decrease. If the cross-sectional area is increased as compared with the related art, the rigidity can be increased as compared with the related art. As a result, it is possible to enlarge the device accommodation space in the front part of the vehicle body while securing necessary rigidity. If the front cross member has a front side wall and a second upper flange and a second lower flange connected to the upper end and the lower end of the front side wall, respectively,
Since the second upper flange and the second lower flange reinforce the front side wall whose center is bulged forward, a predetermined rigidity of the front cross member itself can be secured. Furthermore, if the upper reinforcing flange and the lower reinforcing flange connected to both ends of the second upper flange and the second lower flange are fixed to the side member, a sufficient area for joining the front cross member to the side member is secured. Therefore, it is possible to avoid a decrease in rigidity due to a decrease in the joint area.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a front structure of a vehicle body according to the present invention. FIG. 2 is an enlarged perspective view of a portion A in FIG. FIG. 3 is a sectional view of a cab including the vehicle body structure. FIG. 4 is a plan view corresponding to FIG. 1 and showing a front structure of a vehicle body of a conventional example. [Description of Signs] 11 Chassis frame 16 Side member 16a Outer side wall 16b First upper flange 16c First lower flange 17 Front cross member 17a Front side wall 17b Second upper flange 17c Second lower flange 17d Upper reinforcing flange 17e Lower side Reinforcing flange 21 Front bumper

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62D 21/02 B60K 5/12 B62D 25/08

Claims (1)

(57) Claims 1. A pair of side members (16, 16) and the pair of side members
Front members installed at the front end of the side members (16, 16)
The said frame of the chassis frame (11) having the loss member (17).
Front cross member (17)
Front structure of truck body equipped with front bumper (21)
In the above, the pair of side members (16, 16) are connected to an outer wall (16a) and an upper end and a lower end of the outer wall (16a), respectively, and a first upper flange (16b) and a first lower flange (16c ), The front cross member (17) having a second upper flange (17b) and a second lower flange (17c) connected to the front wall (17a) and the upper and lower ends of the front wall (17a), respectively. ), The front side wall (17a) bends both ends of the flat central portion backward.
Center along the rear surface of the front bumper (21)
Are formed by bulging forward, and an upper reinforcing flange (17d) and a lower reinforcing flange (17e) extending rearward to both ends of the second upper flange (17b) and both ends of the second lower flange (17c). ) Are respectively connected, the upper reinforcing flange (17d) and the lower reinforcing flange
(17e) is a front end lower surface and the front structure of the truck body, characterized in that each of the front end upper surface are secured in the first lower flange (16c) of the first upper flange (16b).