JP3912765B2 - Car body of cab-over type vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body of a cab over type vehicle.
[0002]
[Prior art]
FIG. 4 is a perspective view showing a cab of a truck which is an example of a cab over type vehicle. The vehicle body 1 of the cab shown here has a pair of front pillars 2 extending substantially in the vertical direction, a roof panel 3 is fixed to the upper part thereof, and a cowl extending in the width direction W of the vehicle body 1 is attached to both front pillars 2. Each end of the panel 4 is fixed. A front window 16 is fixed to an opening defined by the roof panel 3, the left and right front pillars 2, and the cowl panel 4. A front panel 5 is provided below the cowl panel 4, and a lower portion of each front pillar 2 is covered with a front corner panel 6. Further, a radiator grille 7 having a large number of ventilation holes is provided below the front panel 5. Headlamps 8 are respectively arranged on the left and right sides of the radiator grille 7 and the front bumper 9 is located below the headlamps 8. Yes.
[0003]
5 is a perspective view showing the front portion of the vehicle body 1 with the front panel 5, the front corner panel 6, the radiator grille 7, the headlamp 8, the front bumper 9 and the like shown in FIG. 4 removed. 5 is a partially broken perspective view of FIG. 5, FIG. 7 is a sectional view taken along line VII-VII of FIG. 5, and FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 5 and 6 show only the left vehicle body structure when viewed in the forward direction of the truck, the vehicle body 1 is configured to be symmetrical.
[0004]
Reference numeral 10 in these drawings denotes a floor panel constituting a floor surface of the passenger compartment, and a dash panel 11 that partitions the front portion of the passenger compartment is fixed to the front end portion of the floor panel 10. The floor panel 10 has a center portion 10A in the vehicle body width direction W protruding above each side portion 10B in the vehicle body width direction W, and an engine (not shown) is positioned below the center portion 10A. The floor panel 10 is formed as a so-called tunnel portion in which a central portion 10A protrudes upward in order to prevent interference with an engine located below the floor panel 10.
[0005]
A radiator 12 indicated by a chain line in FIG. 7 is located below the center portion 10A of the floor panel 10 and in front of the engine (not shown), and passes through the radiator grille 7 shown in FIG. The radiator 12 is cooled by the outside air flowing in from the front.
[0006]
Further, as shown in FIG. 9, floor frames 13 having a substantially U-shaped cross-sectional shape with an open top are fixed to the lower side surfaces of the respective side portions 10B of the floor panel 10. Extends substantially in the front-rear direction of the vehicle body 1, and a lower portion of the dash panel 11 is fixed to each front end portion thereof. Further, a cross member 14 having a substantially C-shaped cross-sectional shape is fixed to the front surface of the dash panel 11. The cross member 14 extends in the width direction W of the vehicle body 1, and each end thereof has left and right front pillars 2. It is fixed to each. Further, as clearly shown in FIGS. 7 and 8, the cross member 14 and the dash panel 11 form a closed cross section having a hollow interior, thereby increasing the overall rigidity and strength of the cross member 14 and the dash panel 11. ing.
[0007]
As described above, the vehicle body 1 of the cab-over type vehicle shown in FIGS. 4 to 9 includes the floor panel 10 in which the vehicle width direction central portion 10A protrudes upward from the vehicle width direction side portions 10B, and the floor panel. 10, a pair of floor frames 13 fixed to the lower surface of each side portion 10B and extending substantially in the front-rear direction of the vehicle body 1, a dash panel 11 fixed to the front ends of these floor frames 13, and the dash panel 11 and a cross member 14 that is fixed to the front surface of the vehicle body 11 and extends in the width direction W of the vehicle body 1.
[0008]
The floor frame 13 and the cross member 14 serve as reinforcing members that increase the rigidity and strength of the vehicle body 1, and particularly when a large external force F (FIG. 4) is applied from the front of the vehicle body 1, the vehicle body 1 is greatly plastically deformed. It works to prevent you from doing. In order for the floor frame 13 and the cross member 14 to fully exhibit the function as such a reinforcing member, as shown in FIG. 10, the height position of the centroid P of the cross section of the cross member 14 and the floor frame 13 It is ideal that the height position of the centroid Q of the cross section of each other coincides. If the centroid P of the cross member 14 is positioned higher than the centroid Q of the floor frame 13 as in the conventional example shown in FIG. 8, a large external force is applied to the cross member 14 from the front of the vehicle body 1. When F is applied, the force cannot be reliably received by the floor frame 13, and the dash panel 11 tends to be permanently deformed rearward as shown by a chain line in FIG. Thus, if the height positions of the centroids P and Q coincide with each other, the external force F applied to the vehicle body 1 is directly transmitted from the cross member 14 to the floor frame 13, and the force is dispersed throughout the vehicle body. Thus, the vehicle body can be prevented from being greatly plastically deformed locally.
[0009]
However, as shown in FIG. 10, if the position of the centroid P of the cross member 14 is greatly lower than the case of FIG. 8, the overall height position of the cross member 14 is lowered. As shown in FIG. 11, the height position of the cross member 14 at the center in the vehicle body width direction is also significantly lower than in the case of FIG. 7, and the cross member 14 is positioned with the upper front of the radiator 12 closed. . For this reason, the cross member 14 prevents the flow of outside air flowing into the radiator 12, and the cooling effect of the radiator 12 is reduced.
[0010]
For the reasons described above, conventionally, as shown in FIGS. 7 and 8, the cross member 14 has a centroid P of the cross member 14 positioned above the upper surface 15 of the floor panel portion in the vicinity of the cross member. The cooling effect of the radiator 12 is prevented from being lowered. The members of the cross member 14, the floor frame 13 and the dash panel 11 are set thick to increase the strength of these members, and these members are also applied when a large external force F is applied to the vehicle body 1. Was prevented from undergoing large plastic deformation. However, if the plate thickness of each member is increased in this way, the disadvantage of increasing the weight and cost of the vehicle body is inevitable.
[0011]
[Problems to be solved by the invention]
The present invention has been made on the basis of the above-described novel recognition, and its object is to prevent a decrease in the cooling effect of the radiator and to enhance the function as a reinforcing member of the cross member and the floor frame. It is an object of the present invention to provide a cab-over type vehicle body that can set the plate thickness of these members to be thinner than before.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is fixed to the floor panel in which the vehicle body width direction central portion protrudes upward from each side portion of the vehicle body width direction, and the lower side surface of each side portion of the floor panel, A cabover having a pair of floor frames extending substantially in the front-rear direction of the vehicle body, a dash panel fixed to the front end of the floor frame, and a cross member fixed to the front surface of the dash panel and extending in the width direction of the vehicle body In the vehicle body of the type vehicle, the centroid of the cross section of the cross member is located above the upper surface of the floor panel portion adjacent to the cross member portion at the vehicle width direction central portion, and each side portion in the vehicle width direction Is characterized in that the cross member is formed so as to be positioned below the upper surface of the floor panel portion adjacent to the cross member portion. To propose a body of a cab-over-type vehicle.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.
[0014]
1 is a perspective view corresponding to FIG. 5, and FIGS. 2 and 3 are cross-sectional views taken along lines II-II and III-III in FIG. 1, respectively. The basic configuration of the vehicle body shown in these drawings is the same as the conventional vehicle body shown in FIGS. Accordingly, in FIGS. 1 to 3, the same reference numerals as those shown in FIGS. 4 to 9 are attached to portions corresponding to the respective parts of the conventional vehicle body, and the description of the same portions as those in the related art is omitted. Further, the appearance of the cab of this example is not different from that of the cab shown in FIG. 4, and therefore FIG. 4 will be referred to as needed in the following description.
[0015]
A difference from the conventional vehicle body is that the centroid P of the cross section of the cross member 14 is located above the upper surface 15 of the floor panel portion adjacent to the cross member portion in the central portion 14A in the vehicle body width direction W ( 2), and in each side portion 14B of the cross member 14 in the vehicle body width direction, the cross member 14 is positioned below the upper surface 15 of the floor panel portion adjacent to the cross member portion (FIG. 3). It is in a formed point. The cross member 14 extends continuously without being divided in the vehicle body width direction W, and the height of the centroid P is lower than the upper surface of each side portion 10B of the floor panel 10 at each side portion 14B. In the central portion 14A of the cross member 14, the height of the centroid P of the cross member 14 and the height of the upper surface 15 of the floor panel 10 are set so as to be higher than the upper surface of the central portion 10A of the floor panel 10. It is replaced in W. In the illustrated example, as clearly shown in FIG. 3, the height position of the centroid P on each side portion 14 </ b> B of the cross member 14 in the vehicle body width direction, and the floor frame fixed to the cross member 14 via the dash panel 11. The height position of the centroid Q of 13 coincides substantially.
[0016]
As described above, the centroid P of each side portion 14B of the cross member 14 is located below the upper surface 15 of the floor panel 10, and particularly as shown in FIG. Since the height positions of the centroids Q coincide with each other, when a large external force F (FIG. 4) is applied to the front portion of the vehicle body 1, the force is applied to the floor frame 13 via the cross member 14 and the dash panel 11. And the force is distributed over the entire vehicle body 1. For this reason, a large stress is not locally generated in the vehicle body 1, and the vehicle body 1 can be prevented from being greatly plastically deformed. Even if the plate thickness of each member such as the cross member 14, the dash panel 11 and the floor frame 13 is set smaller than the conventional one, the rigidity and strength of the entire vehicle body can be increased.
[0017]
On the other hand, in the vehicle body width direction center portion 14A of the cross member 14, the centroid P is located above the upper surface 15 of the floor panel 10, as shown in FIG. The cross member 14 does not block the flow of air flowing into the radiator 12. For this reason, the malfunction which the cooling effect of the radiator 12 falls can be prevented. In this way, it is possible to achieve both the improvement of the strength of the vehicle body and the improvement of the cooling effect of the radiator, which were conventionally considered to be contradictory requirements.
[0018]
The preferred embodiment of the present invention has been described above. However, the present invention is not limited to this configuration, and various modifications can be made. The present invention can also be applied to the body of a cab-over type vehicle other than a truck, for example, the body of a bus or the like.
[0019]
【The invention's effect】
According to the present invention, it is possible to prevent a decrease in the cooling effect of the radiator, and it is possible to enhance the function as a reinforcing member of the cross member and the floor frame, and it is possible to set the plate thickness of these members thinner than before. Thus, the cost and weight of the vehicle body can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a front portion of a vehicle body with some members omitted.
2 is a cross-sectional view taken along line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is an external perspective view of a cab of a track, and is a diagram provided for explaining a conventional example and an embodiment of the present invention.
FIG. 5 is a perspective view showing a front part of a vehicle body of a conventional truck, with some members omitted.
6 is a partially cutaway perspective view of FIG. 5. FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
9 is a cross-sectional view taken along line IX-IX in FIG.
10 is a cross-sectional view similar to FIG. 8 when the height positions of the centroid of the cross member and the centroid of the floor frame are matched. FIG.
11 is a cross-sectional view similar to FIG. 7 for explaining a conventional defect when the configuration shown in FIG. 10 is adopted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Car body 10 Floor panel 10A Center part 10B Side part 11 Dash panel 13 Floor frame 14 Cross member 14A Center part 14B Side part 15 Top surface P Centroid Q Centroid W Width direction

Claims (1)

A floor panel having a central portion in the vehicle body width direction protruding upward from each side portion in the vehicle body width direction, and a pair of floors fixed to the lower side surfaces of the side portions of the floor panel and extending substantially in the front-rear direction of the vehicle body In a vehicle body of a cab-over type vehicle having a frame, a dash panel fixed to the front end portion of the floor frame, and a cross member fixed to the front surface of the dash panel and extending in the width direction of the vehicle body,
The centroid of the cross section of the cross member is positioned above the upper surface of the floor panel portion adjacent to the cross member portion at the center in the vehicle body width direction, and at each side portion in the vehicle body width direction, the cross member A cab-over type vehicle body characterized in that a cross member is formed so as to be positioned below the upper surface of a floor panel portion adjacent to the portion.

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