JP4592009B2 - Car body panels - Google Patents

Description

  The present invention relates to a vehicle body panel constituting a vehicle body of an automobile.

  The body of an automobile is composed of a number of body panels made of, for example, steel plates. Specific examples of the vehicle body panel include a floor panel that forms the floor of the vehicle body, a roof panel that forms the ceiling, and a partition panel that partitions the passenger compartment from the trunk room. It has been well known in the art to form a recess recessed in the vehicle body panel toward the outside of the vehicle (see, for example, Patent Document 1). By forming such a recess in the vehicle body panel, the rigidity of the vehicle body panel can be increased. However, according to a study by the present inventors, when the panel portion adjacent to the corner portion of the recess formed in the vehicle body panel is formed flat, the flat portion is on the surface when the automobile is running. On the other hand, it was clarified that it vibrates with a large amplitude in a direction almost perpendicular to it. This is considered to be because the bending rigidity of the flat portion adjacent to the corner portion of the recess is originally low and stress is concentrated on this portion. As described above, when the flat portion vibrates violently, a muffled sound is generated in the passenger compartment, which causes discomfort to the passenger.

  Therefore, by increasing the plate thickness of the above-mentioned flat part or welding a reinforcing patch to this part to increase the bending rigidity of this part, the amplitude of vibration generated in this part is suppressed, and the generation of a booming noise. It is conceivable to prevent this. However, if such a configuration is adopted, the weight of the vehicle body increases, and the disadvantage of increasing the cost of the automobile is inevitable.

JP 2000-229584 A

  The object of the present invention is to increase the bending rigidity of the panel portion adjacent to the corner portion of the recess, while effectively suppressing the increase in the weight of the vehicle body and the increase in the cost of the automobile, and effectively suppressing the generation of unpleasant booming noise. It is to provide a vehicle body panel that can be used.

  In order to achieve the above object, the present invention is directed to a vehicle body panel of an automobile in which a recess recessed toward the outside of the vehicle is formed. A panel portion adjacent to the corner of the recess is directed from the circular base toward the inside of the vehicle. A vehicle body panel is proposed in which a bead having a shape of a part of a dome that swells like a bowl is formed, and the bead has a substantially crescent shape when viewed from the front. (Claim 1).

  The vehicle body panel is a partition panel that partitions the vehicle compartment and the trunk room, and a lower flange portion of the partition panel is welded to a floor panel that constitutes a floor surface of the vehicle body, and each side of the partition panel in the vehicle width direction. It is advantageous that each of the flange portions is welded to the rear wheel house, and the upper portion of the partition panel is welded to an upper back panel having a cross member fixed to the rear portion.

  According to the present invention, it is possible to increase the bending rigidity of the panel portion adjacent to the corner portion of the recessed portion of the vehicle body panel, and to prevent the panel portion from vibrating with a large amplitude when the vehicle is running.

  Hereinafter, embodiments of the present invention will be described, and the above-described conventional defects will be clarified more specifically with reference to the drawings.

  FIG. 1 is a perspective view of a partition panel 1 as an example of a vehicle body panel as viewed obliquely from above in a vehicle compartment, and FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. As can be seen from FIG. 2, the partition panel 1 partitions the vehicle compartment R and the trunk room T. Moreover, the code | symbol Fr in FIG.1 and FIG.2 has shown the advancing direction of the motor vehicle, and the code | symbol W has shown the vehicle width direction.

  The partition panel 1 is made of a steel plate, and an opening 2 is formed at the center in the vehicle width direction W. Moreover, the partition panel 1 is formed with a pair of recesses 3 and 3A that are recessed toward the vehicle exterior when the panel 1 is viewed from the vehicle interior side, and these recesses 3 and 3A are formed as shown in FIG. Are arranged symmetrically in the vehicle width direction W.

  The lower flange portion 4 of the partition panel 1 is welded to the floor panel 6 constituting the floor surface of the vehicle body 5, and the flange portions 7 and 7 A on each side in the vehicle width direction of the partition panel 1 constitute a part of the vehicle body 5. Are welded to the rear wheel houses 8 and 8A. Further, as shown in FIG. 2, an upper back panel 9 is disposed behind the partition panel 1, and the upper portion of the partition panel 1 is welded to the upper back panel 9 at locations indicated by reference numerals X1 and X2. Yes. A cross member 10 is fixed to the rear portion of the upper back panel 9, and a rear glass 11 is fixed to the cross member 10 with an adhesive. As described above, the upper portion of the partition panel 1 is welded to the upper back panel 9 having the cross member 10 fixed to the rear portion.

  As described above, the partition panel 1 has the recesses 3 and 3A, and the rigidity of the portion where the recesses 3 and 3A are formed is increased. At that time, in the conventional partition panel, since the panel portions 13 and 13A adjacent to the corner portions 12 and 12A of the recesses 3 and 3A are formed flat, the bending rigidity is low, and this panel is used when the automobile is running. Stress concentrates on the portions 13 and 13A. For this reason, in the conventional partition panel, when the vehicle travels, the panel portions 13 and 13A vibrate with a large amplitude in a direction substantially perpendicular to the panel surface, which may cause a booming noise in the vehicle interior. there were. Virtual lines X and Y in FIG. 2 indicate that the panel portion 13 of the conventional partition panel vibrates with a large amplitude in the front-rear direction of the vehicle body when the automobile is running.

  Therefore, in the partition panel 1 shown in FIGS. 1 and 2, beads 14 and 14A bulging toward the vehicle interior are formed in the panel portions 13 and 13A adjacent to the corner portions 12 and 12A of the recesses 3 and 3A. Thus, the bending rigidity of the panel portions 13 and 13A is enhanced. Both beads 14, 14 </ b> A are arranged symmetrically in the vehicle width direction W, and FIG. 3 is an enlarged perspective view showing one of the beads 14. As can be seen from FIG. 3, the bead 14 formed by bulging the panel portion 13 of the partition panel 1 toward the inside of the vehicle has a form of a part of a dome. In FIG. 3, the circular base of the dome is indicated by a solid line and an imaginary line, and a symbol DB is attached, and the swelled dome shape is indicated by two imaginary lines DC1 and DC2. In addition, dots are attached to a part of the dome, and the bead 14 is formed by the dome portion provided with the dots. The dome portion other than the bead 14 is in a state of being beaten by the corner portion 12 of the concave portion 3 and is a portion that does not actually exist as a dome. In this way, the bead 14 has a part of a dome swelled in a bowl shape from the circular base toward the inside of the vehicle. When the bead 14 is viewed from the front, the bead 14 is It is almost crescent shaped. The other bead 14A shown in FIG. 1 is also formed in the same form.

  By forming the above-described beads 14 and 14A on the panel portions 13 and 13A of the partition panel 1, the bending rigidity of the panel portions 13 and 13A can be effectively increased, which is added to the partition panel 1 when the automobile is running. Even when the panel portions 13 and 13A resonate due to the external vibration force, the portions 13 and 13A can be prevented from vibrating with a large amplitude in the longitudinal direction of the vehicle body. Thereby, it is possible to prevent a booming noise from being generated in the vehicle interior.

  The upper back panel 9 shown in FIG. 2 is a member that functions as a support rod that suppresses vibration when the partition panel 1 vibrates. As described above, the beads 14 and 14A are attached to the partition panel 1 as described above. By forming, the function as a support rod of the upper back panel 9 can be further enhanced, and the vibration damping effect of the partition panel 1 can be improved. Moreover, by forming the beads 14 and 14A on the partition panel 1, the torsional rigidity of the partition panel 1 is not lowered.

  Here, if the beads 14 and 14A having the above-described form are referred to as dome-shaped beads as necessary, beads having forms other than the dome-shaped beads 14 and 14A are formed on the panel portions 13 and 13A of the partition panel 1. Even so, it is possible to increase the bending rigidity of the panel portions 13 and 13A. However, if the dome-shaped beads 14 and 14A are formed on the panel portions 13 and 13A, the bending rigidity can be increased more effectively than when other types of beads are formed. This point will be clarified by describing an experimental example performed by the present inventors.

  In this experiment, in addition to the partition panel 1 having the dome-shaped bead 14 shown in FIG. 3, the partition panel 1 having the beads shown in FIGS. 4A and 4B was prepared. The bead 114 shown in FIG. 4A is composed of three beads formed in the panel portion 13 adjacent to the corner portion 12 of the recess 3. This bead 114 is referred to as a three-bead. On the other hand, the bead 214 shown in FIG. 4B extends along the corner portion 12 of the recess 3, and this bead 214 is referred to as a wraparound bead. Both the three beads 114 and the wraparound beads 214 protrude toward the inside of the vehicle. An excitation force was applied to the partition panel 1 having these beads, and the inertance for each frequency was measured. FIG. 5 is a graph showing experimental results in which the horizontal axis represents frequency (Hz) and the vertical axis represents inertance (dB). A dotted line A in this graph is an experimental result of a conventional partition panel in which no bead is formed in the panel portion 13, and a broken line B indicates an experimental result of the three beads 114. Similarly, an alternate long and short dash line C indicates the experimental result of the wraparound bead 214, and a solid line D indicates the experimental result of the dome-shaped bead 14. As can be seen from FIG. 5, the vibration level of the partition panel 1 can be suppressed most effectively by forming the dome-shaped bead 14 in the panel portion 13 of the partition panel 1.

  As described above, the partition panel 1 is shown as an example of the vehicle body panel, but the present invention can also be applied to various vehicle body panels other than the partition panel.

It is a perspective view of a partition panel. It is the II-II line expanded sectional view of FIG. It is an expansion perspective view explaining the form of a dome shape bead. It is a perspective view which shows the bead of forms other than a dome shape bead. It is a graph which shows an experimental result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Partition panel 3,3A Concave part 4 Lower flange part 5 Car body 6 Floor panel 7, 7A Flange part 8, 8A Rear wheel house 9 Upper back panel 10 Cross member 12, 12A Corner part 13, 13A Panel part 14, 14A Bead R car Room T Trunk room

Claims (2)

A body panel of an automobile in which a recess recessed toward the outside of the vehicle is formed. A part of a dome that bulges in a bowl shape from the circular base toward the inside of the vehicle on a panel portion adjacent to the corner of the recess. A vehicle body panel according to claim 1, wherein the bead has a crescent shape when the bead is viewed from the front. The vehicle body panel is a partition panel that partitions a vehicle compartment and a trunk room, and a lower flange portion of the partition panel is welded to a floor panel constituting a floor surface of the vehicle body, and a flange on each side in the vehicle width direction of the partition panel. The vehicle body panel according to claim 1, wherein the parts are welded to the rear wheel house, and the upper part of the partition panel is welded to an upper back panel having a cross member fixed to the rear part.

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