JPH10297531A - Cab structure of truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set up each individual thickness of a front cross, a dash panel and a floor panel to be thinner, and to prevent a offensive stuffy sound in a car room from occurring by installing a reinforcing means in this front cross. SOLUTION: A plurality of pieces of beads 12 are formed in a front cross 8 itself, constituting a reinforcing means. Namely, these beads 12 are formed in a front cross wall part 8c opposed to a front face in the lower part of the dash panel, and extended in the vertical direction. These beads 12 imposed on the front cross 8 are formed, whereby the rigidity in the front cross 8 is enhanced, and at the time of the travel of a truck, such a fear that the front cross 8 is largely subject to bending deformation is preventable. With this constitution, any possible vibration in the dash panel and the floor panel is checkable, therefore even if thickness of these panels is set up to be thinner, any offensive stuffy sound in a car room can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front cross section of a dash panel defining a front portion of a passenger compartment, a front cross section extending long in the width direction of the cab, and a front end of a floor panel constituting a floor surface of the passenger compartment. The lower end of the dash panel is fixed, the front cross is located forward of the lower part of the dash panel, and the upper end of the front cross is fixed to the front of the dash panel, and the lower part of the dash panel and the front cross The present invention relates to a cab structure of a truck in which a space extending in a width direction of a cab is partitioned.

[0002]

2. Description of the Related Art A cab structure of the above-mentioned type employed in a cab-over type truck is well known in the art, and its front cloth serves as a reinforcing member for increasing the rigidity of the front portion of the cab. When a truck equipped with such a cab runs, vibrations from the road surface are transmitted to the cab, and each panel thereof is repeatedly elastically deformed. Each panel vibrates due to an external force applied thereto. If the amplitude of the vibration becomes excessively large at this time, a muffled sound is generated in the vehicle cabin, and the occupant is discomforted. So conventionally,
By increasing the thickness of each panel constituting the cab and increasing its rigidity, the vibration of the panels was suppressed, and the generation of unpleasant muffled sounds was prevented.

However, when the thickness of each panel is increased as described above, the weight of the entire cab increases and the cost of the cab increases.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art and to reduce the thickness of the floor panel, the dash panel and the front cloth to be smaller than before.
An object of the present invention is to provide a cab structure of the type described at the beginning, which can prevent muffled noise from being generated in a vehicle cabin when a truck is running.

[0005]

In order to achieve the above object, the present invention provides a truck cab structure of the type described at the beginning, wherein a reinforcing means is provided on a front cross. suggest.

In this case, it is advantageous that the reinforcing means is formed by a plurality of beads formed on a front cross wall portion facing a front surface of a lower portion of the dash panel and extending in a vertical direction.

Further, it is advantageous that the reinforcing means is arranged in a space defined by a lower portion of the dash panel and a front cross, and is constituted by a stiffener fixed to the front cross.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing a cab 1 of a truck having a cab structure according to the present invention, and FIG.
FIG. 2 is an enlarged sectional view taken along line II. As shown in these drawings, the cab 1 has a roof panel 2 that partitions the upper part of the cabin R, a quarter panel 3 that forms a side portion of the cab 1, and a floor panel 4 that forms a floor surface of the cabin. ing. Reference numeral 5 denotes a pair of front pillars, and reference numeral 6 denotes a windshield provided in a front part of the vehicle compartment.

As shown in FIG. 2, the front end of the floor panel 4 is fixed to the lower end of the dash panel 7 defining the front of the cabin R and the lower end of the front cloth 8 by spot welding. ing. The lower end of the dash panel 7 and the lower end of the front cloth 8 are fixed to the front end of the floor panel 4. In FIG. 2, the connecting portion to which these panels 4, 7, 8 are fixed is denoted by reference numeral 9, and the crosses indicate that spot welding is performed.

As shown in FIGS. 3 and 4, the front cloth 8 extends long in the width direction W of the cab 1, and its longitudinal ends 8a and 8b are connected to the front pillars 5 and 5 shown in FIG. Each is welded to the lower part. The front cloth 8 is lower in height than the dash panel 7 and is located forward of the lower part 7a of the dash panel 7, and the upper end of the front cloth 8 is fixed to the front surface of the dash panel 7 by spot welding. I have. In this manner, the space S extending in the width direction W of the cab 1 is defined by the lower portion 7a of the dash panel 7 and the front cloth 8.

An upper end of the cowl panel 10 extending in the width direction W of the cab 1 is spot-welded to an upper end of the dash panel 7, and the above-mentioned windshield 6 is fixed to a window hole formed above both of them. Are located. Further, a front panel 11 is disposed in front of the dash panel 7, and the front panel 11 covers and covers the dash panel 7 and the front cross 8 from outside. The upper end of the front panel 11 is pivotally connected to the cowl panel 10 via a hinge (not shown).

Each of the above-mentioned panels is made of a highly rigid material such as a steel plate.

As can be seen from the above description, the term "front" or "back" in the present specification means forward and backward with respect to the forward direction F of the truck, and is orthogonal to the forward and backward direction. The direction is the width direction W of the cab 1.

The cab structure of this embodiment is configured as described above.
When the truck having the cab 1 travels, vibrations from the road surface are transmitted to the cab 1 via wheels (not shown). As described above, when the vibration becomes intense, an unpleasant muffled sound is generated in the vehicle cabin R. Therefore, conventionally, the plate thickness of each panel constituting the cab 1 is set to be large, and the rigidity of the whole is reduced. It raised it and prevented it from vibrating violently, but this inevitably led to an increase in the weight of the cab. It is most desirable to set the thickness of each panel to be thin and to obtain a high stiffness of the cab, but it has not been possible to meet such demands in the past.

From such a viewpoint, the present inventor has analyzed the manner in which the panel causes vibration, and was able to clarify the following facts.

Normally, the front part of the floor panel 4 is located substantially horizontally. On the other hand, the dash panel 7 rises upward in a posture substantially orthogonal to the front part of the floor panel 4. However, the truck was running and cab 1
When an external vibration force is applied to the dash panel 7, the lower portion 7a
11, the front cross wall portion 8c facing the front surface is repeatedly elastically bent and deformed to return to the original form as shown in an exaggerated manner in FIG. Thereby, floor panel 4
11 is elastically deformed so as to be lifted upward as shown in an exaggerated manner in FIG. 11, and is repeatedly returned to its original form. Along with this, the dash panel 7 and the floor panel 4
The elastic deformation is repeated while changing the angle θ between the dash panel 7 and the dash panel 7. Dash panel 7 and floor panel 4
However, the expansion and re-expansion centering on the connecting portion 9 of the two, and the deformation returning to the original form is repeated. At this time, both panels 4,
The vibration of 7 generates an unpleasant muffled sound in the cabin R.

Conventionally, the thickness of the front cloth 8, the dash panel 7, and the floor panel 4 is set to be uniformly large, and the rigidity of the whole is increased to suppress the above-described deformation and to generate a muffled sound. As can be understood from the above description, if the front cross 8 can be prevented from being deformed as shown in FIG. 11, the front cross 8 and the dash panel 7 can be prevented.
Even if the thickness of the floor panel 4 is set thinner than before,
The above-described vibration of the dash panel 7 and the floor panel 4 can be suppressed, and the occurrence of muffled noise in the vehicle cabin can be prevented.

The cab structure of this embodiment pays attention to such a point, and provides reinforcing means on the front cross 8 to prevent the front cross 8 from being greatly bent and deformed as shown in FIG. Thus, the thickness of the front cloth 8, the dash panel 7, and the floor panel 4 can be made smaller than before.

The reinforcing means can be constructed in various forms, and in the example shown in FIGS.
A plurality of beads 12 formed on itself constitute reinforcing means. That is, these beads 12 are formed on the front cross wall 8c facing the front surface of the lower part 7a of the dash panel 7, and extend in the vertical direction as shown in FIGS. By forming the bead 12 on the front cloth 8, the front cloth 8
The rigidity of the front cross 8 can be increased to prevent the front cross 8 from being greatly bent and deformed as shown in FIG. As a result, the dash panel 7 and the floor panel 4 can be prevented from vibrating as described above. Although the thicknesses of the panels 4, 7, and 8 are set to be thinner than in the past, the inside of the vehicle cabin is hampered. Sound generation can be prevented.

According to the above structure, since the reinforcing means is formed by forming a bead on the front cloth itself, it is not necessary to add another independent member, and it is possible to prevent an increase in the weight of the cab 1 and an increase in its cost.

On the other hand, in the examples shown in FIGS. 5 and 6,
The reinforcing means is constituted by a plurality of stiffeners 13 fixed to the front cloth 8 and spaced apart from each other in the cab width direction W. As shown in FIG.
The space S is defined by the lower part 7a of the dash panel and the front cloth 8, and the plurality of stiffeners 13 described above are arranged in the space. The tongues 13 b projecting from the main body 13 a of each stiffener 13 are fixed to each wall of the front cloth 8 by spot welding. The stiffener 13 is made of a highly rigid material such as a steel plate.

The shape of the stiffener 13 can be appropriately set other than that shown in FIG. 6, and for example, the stiffener 13 as shown in FIGS. 7 to 10 can be used. In each of the stiffeners 13, a tongue 13b protruding from a main body 13a is fixed to each wall of the front cloth 8 by spot welding. Of course, the stiffener 13 can be fixed to the front cloth 8 by means other than spot welding.

When the stiffener is used as the reinforcing means, the number of parts increases accordingly. However, the stiffener 13 can effectively reinforce the front cloth 8 and greatly increase its rigidity. Even if the thicknesses of the panel 7 and the floor panel 4 are further reduced, generation of muffled noise can be prevented.

The present invention can be applied to various types of truck cab structures other than the illustrated embodiment.

[0026]

According to the cab structure of the first aspect,
The extremely simple structure of the front cross with reinforcement means enables the front cross, dash panel, and floor panel to be thinner than before, and prevents the occurrence of booming noise in the cabin, reducing the weight of the cab. And its cost can be reduced.

According to the cab structure of the second aspect, the reinforcing means can be configured without adding an independent member, and an increase in the cost of the cab can be prevented.

According to the cab structure of the third aspect, the rigidity of the front cross can be effectively increased, and even if the front cross, the dash panel, and the floor panel are formed to be thinner, the interior of the vehicle cabin is reduced. The generation of muffled sound can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cab of a truck.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view showing an example of a front cloth.

FIG. 4 is an enlarged perspective view showing a front cross portion where a bead shown in FIG. 3 is formed.

FIG. 5 is a perspective view showing a front cloth to which a stiffener is fixed.

FIG. 6 is a perspective view of the stiffener shown in FIG. 5;

FIG. 7 is a perspective view showing another example of the stiffener fixed to the front cloth, as viewed from the dash panel side.

FIG. 8 is a perspective view showing another example of the stiffener.

FIG. 9 is a perspective view showing still another example of the stiffener.

FIG. 10 is a perspective view showing still another example of the stiffener.

FIG. 11 is a diagram illustrating the reason why a muffled sound is generated in a vehicle cabin due to deformation of a front cross, a dash panel, and a floor panel.

[Explanation of symbols]

 Reference Signs List 1 cab 4 floor panel 7 dash panel 7a lower part 8 front cross 8c front cross wall 12 bead 13 stiffener R cabin S space W width direction

Claims (3)

[Claims] 1. A lower end portion of a dash panel defining a front portion of a vehicle compartment and a lower end portion of a front cross extending long in a width direction of a cab are fixed to a front end portion of a floor panel constituting a floor surface of the vehicle compartment. The front cross is located forward of a lower portion of the dash panel, and an upper end portion of the front cross is fixed to a front surface of the dash panel, and extends in the width direction of the cab by the lower portion of the dash panel and the front cross. A cab structure for a truck in which a space is partitioned, wherein reinforcing means is provided on the front cross. 2. The reinforcing means is formed on a front cross wall portion facing a lower front surface of the dash panel,
2. The cab structure of a truck according to claim 1, comprising a plurality of beads extending in a vertical direction. 3. The truck according to claim 1, wherein the reinforcing means is disposed in a space defined by a lower portion of the dash panel and a front cross, and is constituted by a stiffener fixed to the front cross. Cab structure.