JP2015193343A - Vibration proof structure of back panel for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration proof structure of a back panel for an automobile capable of suppressing booming noise without causing a problem of rising of cost and increase of weight.SOLUTION: Relating to a vibration proof structure of a back panel 7 for an automobile defining a cabin 3 and a cargo bed 4, at a middle part in a vertical direction of the back panel 7, a step part 7a for positioning a lower part farther in front of vehicle than an upper part is formed so as to extend in a car width direction. At an upper side portion and a lower side portion than the step part 7a of the back panel 7, a plurality of upper side vertical bead 9a and lower side vertical bead 9b are formed parallel to each other, to be divided by the step part 7a.

Description

The present invention relates to a back panel that constitutes a rear wall of a cabin of a cab-over type or a pickup type automobile, and more particularly to a vibration-proof structure that can suppress vibration noise generated during traveling.

  In general, an automobile such as a cab-over truck has a structure in which a cargo bed is connected to the rear of a cabin (cabin), and the cabin and the cargo bed are defined by a wide back panel. Since this type of back panel has a large area, it tends to vibrate during traveling, and there is a problem that a booming noise is likely to occur when the vibration is in a low frequency range. Thus, as a conventional structure for suppressing such vibration noise, there is one disclosed in Patent Document 1, for example. In this conventional structure, a plurality of reinforcing vertical beads extending in the vertical direction are formed in parallel on the back panel at intervals in the vehicle width direction, and the pitch of each bead is unequal so as to be closer to the center in the vehicle width direction. The pitch.

JP 11-34931 A

In the conventional technique, since a plurality of vertical beads are formed in parallel on the back panel, the rigidity in the vertical direction, that is, the rigidity against the force in the direction of bending the vertical beads can be improved. For this reason, expansion and contraction are likely to occur as in the case of an accordion, and as a result, there is a problem that the effect of reducing vibration noise is not sufficient, and in particular, when the vibration is in a low frequency range, a booming noise is generated.

  Here, in order to suppress the vibration noise, it is conceivable to increase the resonance frequency by increasing the thickness of the back panel or adding a reinforcement or the like. However, in this case, there arises a problem that the panel weight increases and the cost increases.

  The present invention has been made in view of the above-described conventional situation, and an object thereof is to provide an anti-vibration structure for a back panel for an automobile that can suppress the generation of a booming noise without causing a problem of cost increase or weight increase. .

The present invention relates to a vibration isolating structure for an automotive back panel that defines a passenger compartment and a loading platform, and a step in which a lower portion of the back panel is positioned in front of the vehicle from an upper portion in a middle portion in the vertical direction of the back panel. Forming the part to extend in the vehicle width direction,
A plurality of upper vertical beads and lower vertical beads are formed in parallel on the upper portion and the lower portion of the back panel, respectively, and are divided at the stepped portion.

According to the vibration isolating structure for an automobile back panel according to the present invention, the upper vertical bead and the lower vertical bead are formed so as to be separated from each other. In other words, when the reinforcing vertical beam is formed so as to pass from the upper part to the lower part of the back panel, the back panel has an accordion shape, so that it easily expands and contracts like an accordion and tends to generate a booming sound. On the other hand, in the present invention, since the reinforcing vertical bead is divided in the middle, the function of preventing the expansion and contraction of the back panel can be obtained by the divided part, and as a result, the generation of the booming noise can be suppressed. .

In the present invention, the step portion is formed so as to extend in the vehicle width direction, and the reinforcing vertical beam is divided at the step portion, so that the step portion serves as a reinforcing member for preventing the back panel from expanding and contracting. It functions, and it can prevent generation | occurrence | production of the said booming sound more reliably.

The present invention can realize the above-described effects with a structure in which the vertical bead is only divided into the upper part and the lower part of the stepped portion, and the weight as in the case where the plate thickness is increased or the reinforcing member is added. No increase in cost or cost will occur.

It is a side view of a cab over type truck provided with a back panel to which an anti-vibration structure concerning Example 1 of the present invention was applied. It is the front view seen from the cabin side of the back panel. FIG. 3 is a cross-sectional side view of the back panel (a cross-sectional view taken along line III-III in FIG. 2). FIG. 3 is an enlarged cross-sectional side view of the back panel (a cross-sectional view taken along line III-III in FIG. 2).

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 4 are views for explaining a vibration isolating structure of a cab over type truck back panel according to a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a cab over type truck provided with the vibration isolating structure of this embodiment. The truck 1 has a schematic structure in which a cabin 3 is mounted on a front portion of a vehicle body frame 2, a loading platform 4 is mounted on a rear portion, and a power train 5 is mounted near the cabin 3 below the vehicle body frame 2. Have. 6a is a front wheel and 6b is a rear wheel.

The cabin 3 includes a floor panel 3a, a front panel 3d, left and right side panels 3c and 3c, a hoof panel 3e, and a back panel 7. Reference numeral 3j denotes an accelerator pedal device disposed on the dashboard 3j.

The back panel 7 is a panel that constitutes the rear end wall of the cabin 3, and is disposed so as to define the cabin 3 and the loading platform 4. Further, a window opening 7b is formed in the upper portion of the back panel 7, and a window glass 8 is attached to the opening 7b.

  A step 7a is formed in the middle of the back panel 7 in the vertical direction so as to extend in the vehicle width direction over the entire area between the left and right edges 7c, 7c. The step portion 7a is a shelf-like member that is formed so that the lower portion 7d of the lower ridge line 7a ′ of the back panel 7 is positioned in front of the vehicle with respect to the upper portion 7e of the upper ridge line 7a ″. The longitudinal length of the loading platform 4 is extended forward.

Further, the stepped portion 7a increases the rigidity of the back panel 7 in the vehicle width direction, that is, the rigidity of the back panel 7 with respect to an external force that relatively moves the central portion in the vehicle front-rear direction with respect to both edge portions 7c, 7c in the vehicle width direction. It has a function.

Upper and lower reinforcing members 10 and 11 are fixed to the inner surface of the back panel 7 near the lower edge of the window opening 7b and near the lower end of the back panel 7. The upper and lower reinforcing members 10 and 11 are hat-shaped in cross section and extend in the vehicle width direction so as to connect the left and right edge portions 7c and 7c. The back panel is similar to the stepped portion 7a. 7 has a function of increasing rigidity in the vehicle width direction.

A vertical reinforcing member 12 is fixed to the inner surface of the back panel 7 in the vehicle width direction. The vertical reinforcing member 12 has a hat shape in cross section, extends in the vehicle vertical direction, and connects the upper reinforcing member 10, the stepped portion 7 a, and the lower reinforcing member 11.

Furthermore, in the portion of the back panel 7 surrounded by the left and right edge portions 7c and 7c, the upper and lower reinforcing members 10 and 11, and the vertical reinforcing member 12, two upper and lower portions are provided. Reinforcing vertical beads 9 extending in the direction are formed in parallel so as to form ridges protruding inside the cabin 3.

The vertical reinforcing bead 9 is divided by the step 7a into an upper vertical bead 9a located above the step 7a and a lower vertical bead 9b located below. Specifically, the lower end 9a 'of the upper vertical bead 9a gradually decreases in height as it approaches the step 7a, and the upper end 9b' of the lower vertical bead 9b becomes farther from the step 7a. The height is gradually getting higher.

According to the vibration isolating structure of the automotive back panel according to the present embodiment, the upper vertical bead 9a and the lower vertical bead 9b are formed so as to be separated from each other by the stepped portion 7a. Can be suppressed. In other words, when the reinforcing vertical bead is formed so as to extend continuously from the upper part to the lower part of the back panel, the back panel has an accordion shape, so that it expands and contracts like an accordion due to running vibration or the like. As a result, a booming noise is likely to occur. On the other hand, in this embodiment, the reinforcing vertical bead 9 is divided in the middle, so that the function of preventing the expansion and contraction of the back panel 7 is obtained by the divided portion. Generation can be suppressed.

Further, in the present embodiment, the portion that divides the reinforcing vertical beam 9 upward and downward is constituted by the step portion 7a formed so as to extend in the vehicle width direction, so that the step portion 7a is the vehicle width of the back panel 7. The point having the function of increasing the rigidity in the direction and the point at which the reinforcing vertical beam 9 is divided upward and downward can prevent the back panel 7 from expanding and contracting more reliably, and can prevent or suppress the booming noise. .

Furthermore, in this embodiment, the upper and lower reinforcing members 10 and 11 are provided, and the upper and lower reinforcing members 10 and 11 and the stepped portion 7a are connected by the vertical reinforcing member 12, so that the reinforcing members 10 and 11 are connected. In addition, the stepped portion 7a cooperates, and also from this point, it is possible to more reliably prevent the generation of the booming noise.

Further, in the present embodiment, the above-described effects can be realized with a structure in which the reinforcing vertical bead 9 is simply divided into the upper vertical bead 9a above the stepped portion 7a and the lower vertical bead 9b below. There is no increase in weight or cost as in the case of increasing the thickness or adding a reinforcing member.

  Furthermore, in the embodiment, the bead height of the lower end 9a 'of the upper vertical bead 9a of the reinforcing vertical bead 9 is gradually lowered and the bead height of the upper end 9b' of the lower vertical bead 9b. Since the height is gradually increased, there is no occurrence of a rigidity break due to the reinforcing vertical bead 9 being divided in the middle.

In the above-described embodiment, the case where the upper vertical bead 9a and the lower vertical bead 9b are arranged on the same straight line, that is, the vehicle width direction position is the same is described. Of course, the vertical bead and the lower vertical bead may have different positions in the vehicle width direction.

1 Cabover truck (automobile)
3 cabin (cabin)
4 Loading platform 7 Back panel 7a Step 9a Upper vertical bead 9b Lower vertical bead

Claims (1)

In the anti-vibration structure for an automobile back panel that defines a passenger compartment and a loading platform, a step portion that positions the lower portion of the back panel forward of the vehicle from the upper portion is provided in the middle of the back panel in the vertical direction. Formed to extend in the direction,
A plurality of upper vertical beads and lower vertical beads are formed in parallel in the upper portion and the lower portion of the back panel so as to be divided at the stepped portion. Shaking structure.

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