JP6803290B2 - Luggage door structure - Google Patents

Description

The present invention relates to a luggage door structure, and more particularly to a luggage door structure capable of reducing the vibration level of the luggage door while suppressing an increase in weight, number of parts, and cost.

Generally, a sedan type vehicle is equipped with a luggage door at the rear. This luggage door is mainly composed of an inner panel formed of a steel material and a support member, and an outer panel joined to the inner panel. FIG. 6 shows a plan view of an inner panel in a conventional luggage door.

In FIG. 6, hinge portions 51 are provided at both ends of the front portion of the inner panel 50, and the hinge portions 51 are rotatable in the vertical direction at the rear portion of the vehicle body (not shown) (openable and closable with respect to the luggage room). ) Connected. Since the load of the luggage door is applied to the hinge portion 51, the hinge reinforcement 52 is joined to the inner panel 50 as a reinforcing member for reducing the load.
As shown in the figure, the inner panel 50 is generally composed of only the bar member 53 in order to reduce the weight in the central portion of the panel.

By the way, while the engine of the vehicle is being driven, the vibration is transmitted to the luggage door, so that the entire door is deformed in the direction of rotation of the door, especially at the center in the width direction of the vehicle. FIG. 7 is a cross-sectional view taken along the line BB of FIG. 6 (the outer panel is also shown). More specifically, as shown in FIG. 7, at the center in the vehicle width direction, the entire panel of the luggage door 60 is deformed by applying a load in the height H direction (rotation direction indicated by the arrow) (FIG. 6). Where H is in the vehicle height direction and L is in the vehicle length direction).

Further, FIG. 8 is a cross-sectional view taken along the line CC of FIG. 6 (the outer panel is also shown). As shown in FIG. 8, in the front side portion of the panel near the rotation axis of the luggage door 60, bending deformation occurs in a mountain shape (in FIG. 8, H is the vehicle height direction and W is the vehicle width direction).
When the panel deformation of the luggage door 60 is repeatedly generated in synchronization with the input from the road surface during traveling, a large resonance occurs in the luggage door, and there is a problem that the muffled sound is loud.

In response to such problems, conventionally, as shown in the exploded perspective view of FIG. 9, a method of attaching a mass damper member 70 (dynamic vibration absorber) for suppressing the resonance of the panel to the inner panel 50 has been widely adopted. (For example, Patent Document 1).
Further, as shown in FIG. 10 showing a cross-sectional view of the panel portion in the front-rear direction of the vehicle, a method of increasing the rigidity by interposing a PP sheet (polypropylene sheet) 75 as an elastic body between the outer panel 55 and the inner panel 50. It was taken.

Japanese Unexamined Patent Publication No. 2012-207695

As described above, according to the measures by the mass damper 70 and the PP sheet 75, the resonance can be significantly suppressed and the muffled sound can be reduced.
However, by adding the mass damper 70, there is a problem that the weight and the number of parts are increased, and the cost is also increased. That is, there is a problem that it contradicts the purpose of weight reduction and low cost, which are in high demand in recent vehicle model development.

The present invention has been made by paying attention to the above points, and provides a luggage door structure capable of reducing the vibration level of the luggage door while suppressing an increase in weight, number of parts, and cost in the luggage door of the vehicle. The purpose is to do.

In order to solve the above-mentioned problems, the luggage door structure according to the present invention includes an inner panel having an outer frame portion forming an outer peripheral portion, an outer panel coupled to the inner panel on the inner panel, and a vehicle width. It is a luggage door structure including a pair of hinge portions provided on both end sides in the direction, and is provided on both end sides in the vehicle width direction in the space between the outer panel and the inner panel, respectively, and the pair of hinges. A pair of hinge reinforcements for reinforcing the portion and a noise / vibration resistance extending in the vehicle width direction between the pair of hinge reinforcements are provided, and the noise resistance / vibration reinforcement is an end portion in the vehicle width direction. Is coupled between the front and rear ends of the pair of hinge reinforces in the vehicle front-rear direction, and at least is coupled to the inner panel.
Incidentally, in the height direction, the anti-noise / vibration reinforcement, except vehicle width direction end portion of the anti-noise / vibration reinforcement, so as to be positioned on the outer panel side of the hinge reinforcements, the outer panel side It is desirable that it is formed in a convex shape .
Further, it is preferable that the noise-resistant / vibration-resistant reinforcement has an inverted U-shaped cross section in the front-rear direction of the vehicle and is coupled to the inner panel in a closed state.
Further, it is preferable that the noise-resistant / vibration-resistant reinforcement is bonded to the outer panel via a cushion member made of a soft resin.

According to such a configuration, by providing the noise resistance / vibration reinforcement which is not provided in the conventional structure, the mass effect can be improved, the deformation in the luggage door rotation direction can be suppressed, and the vibration of the door panel can be suppressed. In addition, the number of parts and the weight can be reduced as compared with the conventional configuration in which the mass damper member is added, and the increase in cost can be suppressed.
Further, the noise resistance / vibration reinforcement is connected to the inner panel and the outer panel by providing a cushion member made of a soft resin such as mastic between the noise resistance / vibration reinforcement and the outer panel. Therefore, it is possible to suppress the cross-sectional collapse between the outer panel and the inner panel.

Further, by joining both ends of the noise-resistant / vibration-resistant reinforcement with the hinge reinforcement, angular deformation of the support portion can be suppressed.
Further, in the noise resistance / vibration reinforcement, when the cross section in the front-rear direction of the vehicle is inverted U-shaped, the inside becomes a hollow member, and the weight increase of the luggage door can be suppressed while improving the rigidity.

According to the present invention, it is possible to provide a luggage door structure capable of reducing the vibration level of the luggage door while suppressing an increase in weight, number of parts, and cost in the luggage door of the vehicle.

FIG. 1 is a partially broken plan view showing the entire structure of the luggage door structure according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a cross-sectional view of the front side portion of the luggage door in the vehicle width direction. FIG. 3 is a cross-sectional view of the front side portion of the luggage door in the vehicle front-rear direction. FIG. 4 is a graph showing a comparison between the result of Example 1 and the result of Comparative Example 1 according to the present invention. FIG. 5 is a graph showing a comparison between the result of Comparative Example 2 and the result of Comparative Example 1. FIG. 6 is a plan view of an inner panel in a conventional luggage door. FIG. 7 is a cross-sectional view taken along the line BB of FIG. 6 (the outer panel is also shown). FIG. 8 is a cross-sectional view taken along the line CC of FIG. 6 (the outer panel is also shown). FIG. 9 is an exploded perspective view of a conventional configuration in which a mass damper member is attached to an inner panel. FIG. 10 is a cross-sectional view of a conventional panel portion in the front-rear direction of the vehicle.

Hereinafter, embodiments of the luggage door structure according to the present invention will be described with reference to the drawings. FIG. 1 is a partially broken plan view showing the entire structure of the luggage door structure according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a cross section of the front side portion of the luggage door in the vehicle width direction. Further, FIG. 3 shows a cross section of the front side portion of the luggage door in the vehicle front-rear direction.

The luggage door 1 shown in FIGS. 1 to 3 mainly includes an inner panel 2 which is a support member, and an outer panel 3 coupled to the inner panel 2 on the inner panel 2. The inner panel 2 and the outer panel 3 are hemmed on the outer circumference and joined to each other.
The inner panel 2 is made of steel, and has an outer frame portion 4 forming an outer peripheral portion thereof, a crossbar 5 arranged inside the outer frame portion 4, and a luggage door 1 for a vehicle (not shown). It is provided with a pair of hinge portions 6 provided on both end sides in the vehicle width direction so as to be rotatably attached in the vertical direction.

Further, the inner panel 2 has noise resistance / vibration resistance extending along the vehicle width direction between the pair of hinge reinforcements 7 and 8 serving as reinforcing members for the pair of hinge portions 6 and the pair of hinge reinforcements 7 and 8. It is equipped with a hinge 10.

As shown in FIG. 2, the hinge reinforcements 7 and 8 provided on both ends in the vehicle width direction are bent in an S-shaped cross section in the vehicle width direction and fixed to the inner panel 2 by spot welding, and the lower surface side thereof is noise resistant / It is joined to the upper surface side of the end portion of the vibrating reinforcement 10 by spot welding.
Further, as shown in FIG. 3, the noise-resistant / vibration-resistant reinforcement 10 has an inverted U-shaped cross section in the front-rear direction of the vehicle, and the front-rear portion thereof is joined to the inner panel 2 to create an internal space. It is in a substantially closed state, and is configured to improve rigidity while suppressing weight increase.
With this configuration, the front part of the luggage door 1 is lightweight and has improved rigidity, and bending deformation of the luggage door 1, collapse of the cross section between the outer panel 3 and the inner panel 2, angular deformation of the hinge portion of the luggage door 1 and the like are suppressed. Will be.

That is, according to the present embodiment, by providing the noise-resistant / vibration-resistant reinforcement 10 coupled to the hinge reinforcements 7 and 8, the mass effect is improved, the deformation in the luggage door rotation direction is suppressed, and the resonance of the door panel is prevented. can do.
In addition, the number of parts and the weight can be reduced as compared with the conventional configuration in which the mass damper member is added, and the increase in cost can be suppressed.

Further, as shown in FIG. 3, a cushion member 20 made of a soft resin such as mastic is provided between the noise-resistant / vibration-resistant reinforcement 10 and the outer panel 3, whereby the noise-resistant / vibration-resistant reinforcement 10 is inner. It will be connected to the panel 2 and the outer panel 3. Therefore, it is possible to suppress the cross-sectional collapse between the outer panel 3 and the inner panel 2.

Further, since both ends of the noise-resistant / vibration-resistant reinforcement 10 are joined to the hinge reinforcements 7 and 8, angular deformation of the support portion can be suppressed.
Further, as shown in FIG. 3, since the noise-resistant / vibration-resistant reinforcement 10 is a hollow member, it is possible to suppress an increase in the weight of the luggage door while improving the rigidity.

In the above-described embodiment, as shown in FIG. 2, both ends of the noise-resistant / vibration-resistant reinforcement 10 are joined to the lower side of the hinge reinforcements 7 and 8. However, in the present invention, this is the configuration. The configuration is not limited to this, and the configuration may be joined to the upper side of the hinge reinforcements 7 and 8.

Further, in the above-described embodiment, the noise-resistant / vibration-resistant reinforcement 10 has an inverted U-shaped cross section in the vehicle front-rear direction, and the front-rear portion thereof is joined to the inner panel 2, so that the internal space is substantially closed. The configuration is in a state, but the configuration is not limited to that configuration. For example, even if the noise resistance / vibration reinforce 10 is formed in a plate shape, a sufficient mass effect can be obtained and vibration can be reduced as compared with the conventional case.

The luggage door structure according to the present invention will be further described based on examples. In this embodiment, the luggage door shown in the above embodiment was manufactured and its seismic performance was verified.
As an experimental condition, the frequency was analyzed by measuring the acceleration at the same position when the front end of the luggage door was vibrated (Example 1).
Further, as Comparative Example 1, the vibration level was measured in the same manner for the luggage door without vibration countermeasures.
The experimental results of Example 1 and Comparative Example 1 are shown in the graph of FIG. In the graph of FIG. 4, the horizontal axis is frequency (Hz) and the vertical axis is vibration (dB).
As shown in FIG. 4, the vibration level could be significantly reduced as compared with Comparative Example 1 (specifically, 2 dB improvement).

Further, as Comparative Example 2, the vibration level of a luggage door provided with a conventional mass damper was measured under the same experimental conditions. The experimental results of this comparative example are shown in the graph of FIG. In the graph of FIG. 5, the horizontal axis is frequency (Hz) and the vertical axis is vibration (dB).
As shown in FIG. 5, in Comparative Example 2, the vibration level was reduced as in Example 1.
From the results of the above Examples, it was confirmed that according to the present invention (Example 1), the same effect of reducing the vibration level as the countermeasure using the conventional mass damper can be obtained.
According to the configuration of the first embodiment, there is an advantage that the number of parts and the weight can be reduced as compared with the configuration using the conventional mass damper (comparative example 2).

1 Luggage door 2 Inner panel 3 Outer panel 4 Outer frame part 4a Opening 5 Crossbar 6 Hinge part 7 Hinge reinforce 8 Hinge reinforce 10 Noise resistance / vibration reinforce 20 Cushion member

Claims (4)

A luggage door including an inner panel having an outer frame portion forming an outer peripheral portion, an outer panel coupled to the inner panel on the inner panel, and a pair of hinge portions provided on both end sides in the vehicle width direction. It's a structure
A pair of hinge reinforcements provided on both ends in the vehicle width direction in the space between the outer panel and the inner panel to reinforce the pair of hinge portions.
Between the pair of hinge reinforcements, a noise-resistant / vibration-resistant reinforcement extending in the vehicle width direction is provided.
The noise-resistant / vibration-resistant reinforcement is characterized in that its vehicle width direction end is coupled between the front-rear ends of the pair of hinge reinforcements in the vehicle front-rear direction, and at least is coupled to the inner panel. Luggage door structure. In the height direction, the noise- resistant / vibration- resistant reinforcement has a convex shape toward the outer panel so as to be located closer to the outer panel than the hinge reinforcement , except for the end portion of the noise-resistant / vibration reinforcement in the vehicle width direction. The luggage door structure according to claim 1, wherein the luggage door structure is formed in . Claim 1 or claim, wherein the noise-resistant / vibration-resistant reinforcement has an inverted U-shaped cross section in the front-rear direction of the vehicle and is coupled to the inner panel in a closed state. The luggage door structure described in 2. The luggage door structure according to any one of claims 1 to 3, wherein the noise-resistant / vibration-resistant reinforcement is bonded to the outer panel via a cushion member made of a soft resin.

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