JP7371459B2 - car body structure - Google Patents

Description

The present invention relates to a vehicle body structure.

A roof panel of a vehicle such as an automobile has a thin plate shape and has a size that covers the upper part of the vehicle interior. For this reason, the roof panel is susceptible to vibration, and when low frequency waves are generated, this becomes one of the causes of low frequency noise for occupants inside the vehicle. Therefore, the vibration of the roof panel is generally reduced by forming beads on the roof panel or by increasing the structural strength of the roof panel with reinforcing members such as cross members located on the passenger compartment side of the roof panel. Measures are being taken.

Patent Document 1 discloses a vehicle roof that includes a pair of left and right roof side rails extending in the longitudinal direction of a vehicle, a reinforcement extending in the vehicle width direction between the pair of roof side rails, a roof panel, and an adhesive portion. The structure is described. The roof panel is located above the reinforcement and between a pair of roof side rails. Furthermore, the roof panel is provided with concave lines extending in the longitudinal direction of the vehicle at two locations on the left and right when viewed in the vehicle width direction. The adhesive portion is provided at the intersection with the concave line on the upper surface of the reinforcement, and uses mastic adhesive to adhere the roof panel and the reinforcement.

In Patent Document 1, a concave line extending in the longitudinal direction of the vehicle is provided on the roof panel, and an adhesive portion is provided at the intersection of the reinforcement and the concave line to bond the roof panel and the reinforcement. It is said that the vibrations that occur are effectively damped.

Japanese Patent Application Publication No. 2012-245898

However, in the vehicle roof structure of Patent Document 1, although adhesive is disposed at the intersection of the reinforcement and the concave line, the adhesive is only used to fix the roof panel. That is, in Patent Document 1, there is room for improvement in damping vibrations of the roof panel.

SUMMARY OF THE INVENTION In view of these problems, an object of the present invention is to provide a vehicle body structure that can attenuate vibrations of a roof panel and reduce low-frequency noise for occupants inside a vehicle.

In order to solve the above problems, a typical configuration of a vehicle body structure according to the present invention is a vehicle body structure that includes a roof panel that covers the upper part of the cabin of the vehicle, and the vehicle body structure further includes a frame that surrounds the outer periphery of the roof panel. , a reinforcing member located on the passenger compartment side of the roof panel and extending across the frame in the vehicle width direction or vehicle longitudinal direction; and a reinforcing member applied to multiple predetermined locations on the reinforcing member to bond the reinforcing member and the roof panel. and a plurality of sealing materials having a predetermined damping force, and the volume of the plurality of sealing materials increases as the vehicle approaches the center of the roof panel in the vehicle width direction or the vehicle longitudinal direction.

According to the present invention, it is possible to provide a vehicle body structure that can attenuate vibrations of a roof panel and reduce low-frequency noise for occupants inside a vehicle interior.

1 is a diagram showing a vehicle body structure according to an embodiment of the present invention. 2 is a diagram illustrating main parts of the vehicle body structure of FIG. 1. FIG. FIG. 6 is a diagram showing a vehicle body structure according to another embodiment of the present invention. 3 is a diagram showing a modification of the vehicle body structure of FIG. 2. FIG. 4 is a diagram showing a modification of the vehicle body structure shown in FIG. 3. FIG.

A typical configuration of a vehicle body structure according to an embodiment of the present invention is that the vehicle body structure includes a roof panel that covers the upper part of the cabin of the vehicle, and the vehicle body structure further includes a frame body surrounding the outer periphery of the roof panel, and A reinforcing member is located on the passenger compartment side of the panel and extends across the frame in the vehicle width direction or vehicle longitudinal direction, and a reinforcing member is applied to multiple predetermined locations on the reinforcing member to adhere the reinforcing member and the roof panel. A plurality of sealing materials having a damping force are provided, and the volume of the plurality of sealing materials becomes larger as the roof panel approaches the center in the vehicle width direction or the center in the longitudinal direction of the vehicle.

Among the vibrations of the roof panel, the main vibrations that form low frequencies that cause low-frequency noise are drums whose antinode is at the center of the roof panel in the vehicle width direction or the center of the vehicle longitudinal direction, and whose nodes are near the outer edge of the roof panel. It is a type of vibration. Therefore, in the present invention, the sealer material is applied so that the volume of the sealer material having a damping force increases as it approaches the center of the roof panel in the vehicle width direction or the vehicle longitudinal direction. Therefore, among the vibrations of the roof panel, vibrations at a predetermined portion corresponding to the antinode can be more effectively damped. Therefore, it is possible to reduce low frequency noise to the occupants inside the vehicle.

The area of the above-mentioned plurality of sealants when viewed from above is preferably larger as the reinforcing member and the roof panel are bonded and cured, the closer they are to the center of the roof panel in the vehicle width direction or the center of the vehicle longitudinal direction.

The sealer material having a damping force can damp drum-shaped vibrations of the roof panel more effectively as the area viewed from above increases. In the present invention, as described above, the area of the sealant applied to a predetermined location when viewed from above increases as it approaches the center in the vehicle width direction or the center in the longitudinal direction of the vehicle, which is the antinode of drum-shaped vibrations in the roof panel. Therefore, vibrations of the roof panel can be damped more effectively.

The distance between the roof panel and the reinforcing member in the vertical direction is preferably larger as the distance approaches the center of the roof panel in the vehicle width direction or the center in the longitudinal direction of the vehicle.

Thereby, the distance between the roof panel and the reinforcing member in the stroke direction that is the same as the drum-shaped vibration of the roof panel, that is, in the vertical direction, can be increased as the roof panel approaches the center in the vehicle width direction or the center in the vehicle longitudinal direction. Therefore, the damping force of the sealer material can be fully exerted, and vibrations of the roof panel can be damped more effectively. Furthermore, even if the area of the sealer material applied to a predetermined location on the reinforcing member is the same when viewed from above, the above-mentioned spacing increases as the distance from the roof panel approaches the center in the vehicle width direction or the center in the longitudinal direction of the vehicle. The volume applied to the area can be increased.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these examples are merely illustrative to facilitate understanding of the invention, and do not limit the invention unless otherwise specified. In this specification and the drawings, elements with substantially the same functions and configurations are given the same reference numerals to omit redundant explanation, and elements not directly related to the present invention are omitted from illustration. do.

FIG. 1 is a diagram showing a vehicle body structure 100 according to an embodiment of the present invention. FIG. 1A shows a state in which a vehicle 102 to which the vehicle body structure 100 is applied is viewed diagonally from the front. FIG. 1(b) is a diagram showing a part of the vehicle body structure 100 of FIG. 1(a). In each of the figures below, the longitudinal direction of the vehicle is illustrated by arrows Front and Back, the left and right directions of the vehicle are illustrated by arrows Left and Right, and the vertical direction of the vehicle is illustrated by arrows Up and Down, respectively.

The vehicle body structure 100 includes a roof panel 104 shown in FIG. 1(a). The roof panel 104 is a thin plate-shaped vehicle body panel, and has a size that covers the upper part 106 of the vehicle interior of the vehicle 102. The vehicle body structure 100 further includes a frame 108 shown in FIG. 1(b) and a plurality of (four in this case) cross members 110, 112, 114, and 116 as reinforcing members shown in FIG. 2(a).

FIG. 2 is a diagram showing main parts of the vehicle body structure 100 of FIG. 1. FIG. 2(a) shows the inside of the vehicle body structure 100. FIG. 2(b) is a sectional view taken along the line AA in FIG. 2(a), and shows the roof panel 104 with a chain line.

The frame 108 includes a pair of roof rails 118 and 120, a roof front member 122, and a roof end member 124, and these members surround the outer periphery of the roof panel 104. The pair of roof rails 118 and 120 are located at the left and right side ends of the roof panel 104 and extend in the vehicle longitudinal direction. The roof front member 122 is located on the front end side of the roof panel 104 and extends in the vehicle width direction between the pair of roof rails 118 and 120. The roof end member 124 is located on the rear end side of the roof panel 104 and extends in the vehicle width direction between the pair of roof rails 118 and 120.

The plurality of cross members 110, 112, 114, and 116 are located on the vehicle interior 126 side of the roof panel 104 shown in FIG. 1(a). Further, the cross members 110, 112, 114, and 116 are spaced apart from each other at a predetermined interval in the longitudinal direction of the vehicle, and are further spanned in the vehicle width direction between a pair of roof rails 118, 120 of the frame 108.

Here, the thin plate-shaped roof panel 104 easily vibrates, and when low frequency waves are generated, this becomes one of the causes of low frequency noise to the occupants inside the vehicle interior 126. Among the vibrations of the roof panel 104, the main vibrations that form low frequencies that cause low-frequency noise have an antinode at the center of the roof panel 104 in the vehicle width direction or the center in the vehicle longitudinal direction, and a node near the outer edge of the roof panel 104. It is a drum-shaped vibration.

Therefore, the vehicle body structure 100 further includes a plurality of sealers 128 shown by hatching in FIG. 2(a). In the figure, among the plurality of cross members 110, 112, 114, and 116, sealants 130, 132, 134, and 136 applied to predetermined locations of a plurality of (four in this case) cross members 114 are representatively indicated by reference numerals. is attached.

The plurality of sealing materials 128 are sealing materials to which a predetermined damping force is added in addition to adhesive force. The plurality of sealants 128 are applied to a plurality of predetermined locations on the plurality of cross members 110, 112, 114, and 116, as shown in FIG. The roof panel 104 is bonded. Note that the plurality of sealer materials 128 shown in FIG. 2(a) are in a cured state after bonding the plurality of cross members 110, 112, 114, and 116 to the roof panel 104.

Further, the volume of the plurality of sealing materials 128 increases as it approaches the center of the roof panel 104 in the vehicle width direction. As an example, the volume of the sealant materials 130, 132, 134, and 136 applied to four predetermined locations on the cross member 114 is determined by the vehicle width of the roof panel 104, as shown in FIGS. 2(a) and 2(b). The closer you get to the center of the direction, the larger it becomes. That is, the volume of the sealer materials 130, 132, 134, and 136 is increased in this order. Furthermore, as is clear from FIG. 2(a), the area of the plurality of sealant materials 128 when viewed from above increases as the area approaches the center of the roof panel 104 in the vehicle width direction. Here, the area of the sealer material 128 is increased by increasing the length of the sealer material 128 in the vehicle width direction as the vehicle approaches the center of the roof panel 104 in the vehicle width direction.

In this manner, in the vehicle body structure 100, the sealer material 128 is applied such that the volume of the sealer material 128 having damping force increases as the vehicle approaches the center of the roof panel 104 in the vehicle width direction. Therefore, according to the vehicle body structure 100, among the vibrations of the roof panel 104, the vibrations at a predetermined portion corresponding to the antinode of the drum-shaped vibration can be more effectively damped, and the vibrations for the occupants inside the vehicle interior 126 can be damped more effectively. Can reduce frequency noise.

In addition, in the vehicle body structure 100, the area of the sealant 128 applied to a plurality of predetermined locations of the plurality of cross members 110, 112, 114, and 116 when viewed from above is determined as the antinode of the drum-shaped vibration in the roof panel 104. The closer it gets to the center in the width direction of the vehicle, the larger it becomes. Therefore, according to the vehicle body structure 100, vibrations of the roof panel 104 can be damped more effectively.

FIG. 3 is a diagram showing a vehicle body structure 100A according to another embodiment of the present invention. FIG. 3(a) shows the inside of the vehicle body structure 100A. FIG. 3(b) is a sectional view taken along line BB in FIG. 3(a), and shows the roof panel 104A with a chain line.

The vehicle body structure 100A differs from the above-described vehicle body structure 100 in that the distance between the roof panel 104A and the plurality of cross members 110A, 112A, 114A, and 116A in the vertical direction increases as it approaches the center of the roof panel 104A in the vehicle width direction. .

That is, in the vehicle body structure 100A, as typically shown in FIG. 3(b), the vertical distance between the roof panel 104A and the cross member 114A is increased in the order of La, Lb, Lc, Ld, and Le. Therefore, the closer the roof panel 104A and the plurality of cross members 110A, 112A, 114A, and 116A are to the center of the roof panel 104A in the vehicle width direction, the more the distance in the stroke direction, that is, the vertical direction, is the same as the drum-shaped vibration of the roof panel 104A. You can make it bigger.

Further, the vehicle body structure 100A includes a plurality of sealers 138 shown by hatching in FIG. 3(a). In the figure, sealant materials 140, 142, 144, 146, 148, and 150 are applied to predetermined locations of a plurality of cross members 114A (six in this case) among a plurality of cross members 110A, 112A, 114A, and 116A. Representative symbols are given.

The plurality of sealing materials 138 are sealing materials to which a predetermined damping force is added in addition to adhesive force, similar to the sealing material 128 described above. The predetermined damping force is, for example, one in which the loss tangent (tan δ) is as high as 0.5 or more at room temperature (20 degrees Celsius), and has a damping effect about twice that of a normal damping force. As shown in FIG. 3(a), the plurality of sealants 138 are applied to a plurality of predetermined locations on the plurality of cross members 110A, 112A, 114A, and 116A. The roof panel 104A is bonded. Note that the plurality of sealer materials 138 shown in FIG. 3(a) are in a cured state after bonding the plurality of cross members 110A, 112A, 114A, 116A and the roof panel 104A.

In the vehicle body structure 100A, the roof panel 104A and the plurality of cross members 110A, 112A, 114A, and 116A are bonded together using a sealer material 138, and the above-mentioned vertical distance increases as the distance approaches the center of the roof panel 104A in the vehicle width direction. . Therefore, according to the vehicle body structure 100A, the damping force of the plurality of sealers 138 can be sufficiently exerted, and the vibrations of the roof panel 104A can be damped more effectively.

Further, according to the vehicle body structure 100A, even if the area of the sealant 138 applied to a predetermined location is the same when viewed from above, the distance increases as the distance from the roof panel 104A approaches the center of the vehicle width direction. The volume applied to the area can be increased. As an example, the volume of the sealant materials 140, 142, 144, 146, 148, and 150 applied to six predetermined locations of the cross member 114A is as shown in FIG. The closer you get to it, the bigger it gets. That is, the volume of the sealer materials 140, 142, 144, 146, 148, and 150 is increased in this order.

Therefore, according to the vehicle body structure 100A, among the vibrations of the roof panel 104A, vibrations at a predetermined portion corresponding to the antinode of the drum-shaped vibration can be more effectively damped, thereby reducing the impact on the occupants in the vehicle interior 126. Can reduce frequency noise.

FIG. 4 is a diagram showing a modification of the vehicle body structure 100 of FIG. 2. In FIG. FIG. 4(a) shows the inside of a modified vehicle body structure 100B. FIG. 4(b) is a sectional view taken along the line CC in FIG. 4(a), and shows the roof panel 104B with a chain line.

In the vehicle body structure 100B, as shown in FIG. 4(a), a plurality of cross members 152, 154, and 156 are provided across the frame 108 in the longitudinal direction of the vehicle. Further, in the vehicle body structure 100B, the volume of the plurality of sealants 158 applied to the plurality of predetermined locations of the plurality of cross members 152, 154, and 156 approaches the center of the roof panel 104B in the longitudinal direction of the vehicle as shown in FIG. 4(b). As big as it is.

As an example, the volumes of the sealant materials 160, 162, 164, and 166 applied to four predetermined locations on the cross member 154 are as shown in FIGS. 4(a) and 4(b). The closer you get to the center of the direction, the larger it becomes. That is, the volume of the sealer materials 160, 162, 164, and 166 is increased in this order. Furthermore, as is clear from FIG. 4(a), the area of the plurality of sealer materials 158 when viewed from above increases as the area approaches the center of the roof panel 104B in the vehicle longitudinal direction. Here, the area of the sealer material 158 is increased by increasing the length of the sealer material 158 in the vehicle longitudinal direction as it approaches the center of the roof panel 104B in the vehicle longitudinal direction.

In this manner, in the vehicle body structure 100B, the sealer material 158 is applied such that the volume of the sealer material 158 having a damping force increases as it approaches the center of the roof panel 104B in the longitudinal direction of the vehicle. Therefore, according to the vehicle body structure 100B, among the vibrations of the roof panel 104B, it is possible to more effectively attenuate the vibrations at a predetermined portion corresponding to the antinode of the drum-shaped vibration, thereby reducing the impact on the occupants in the vehicle interior 126. Can reduce frequency noise.

In addition, in the vehicle body structure 100B, the area of the sealant 158 applied to a plurality of predetermined locations of the plurality of cross members 152, 154, and 156 when viewed from above is determined from the front and back of the vehicle, which is the antinode of the drum-shaped vibration in the roof panel 104. The closer you get to the center of the direction, the larger it becomes. Therefore, according to the vehicle body structure 100B, vibrations of the roof panel 104B can be damped more effectively.

FIG. 5 is a diagram showing a modification of the vehicle body structure 100A of FIG. 3. FIG. 5(a) shows the inside of a modified vehicle body structure 100C. FIG. 5(b) is a sectional view taken along line DD in FIG. 5(a), and shows the roof panel 104C with a chain line.

In the vehicle body structure 100C, as shown in FIG. 5(a), a plurality of cross members 152, 154, and 156 are provided across the frame 108 in the longitudinal direction of the vehicle. Further, in the vehicle body structure 100C, as shown in FIG. 5(b), the distance between the roof panel 104C and the plurality of cross members 152, 154, and 156 in the vertical direction increases as the distance approaches the center of the roof panel 104C in the longitudinal direction of the vehicle.

As an example, as typically shown in FIG. 5(b), the vertical distance between the roof panel 104C and the cross member 154A is increased in the order of Lf, Lg, Lh, Li, and Lj. Therefore, the closer the roof panel 104C and the plurality of cross members 152, 154, 156 are to the center of the roof panel 104C in the longitudinal direction of the vehicle, the larger the interval in the stroke direction that is the same as the drum-shaped vibration of the roof panel 104C, that is, in the vertical direction. .

Therefore, in the vehicle body structure 100C, the roof panel 104C and the plurality of cross members 152, 154, 156 are bonded together using a sealer material 170 having damping force, and the above-mentioned vertical interval is set at the center of the roof panel 104C in the longitudinal direction of the vehicle. The closer you get to it, the larger it becomes. Therefore, according to the vehicle body structure 100C, the damping force of the plurality of sealers 168 can be fully exerted, and the vibrations of the roof panel 104C can be damped more effectively.

Further, according to the vehicle body structure 100C, even if the area of the sealant 168 applied to a predetermined location is the same when viewed from above, the distance increases as the distance approaches the center of the roof panel 104C in the longitudinal direction of the vehicle. The volume applied to the area can be increased. As an example, the volume of the sealant materials 170, 172, 174, 176, 178, and 180 applied to six predetermined locations of the cross member 154 is as shown in FIG. The closer you get to it, the bigger it gets. That is, the volume of the sealer materials 170, 172, 174, 176, 178, and 180 is increased in this order.

Therefore, according to the vehicle body structure 100C, among the vibrations of the roof panel 104C, it is possible to more effectively attenuate vibrations at a predetermined portion corresponding to the antinode of the drum-shaped vibration, thereby reducing the impact on the occupants in the vehicle interior 126. Can reduce frequency noise.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Understood.

INDUSTRIAL APPLICATION This invention can be utilized for a vehicle body structure.

100, 100A, 100B, 100C... Vehicle body structure, 102... Vehicle, 104, 104A, 104B, 104C... Roof panel, 106... Vehicle interior upper part, 108... Frame body, 110, 110A, 112, 112A, 114, 114A, 116 , 116A, 152, 154, 156... Cross member, 118, 120... Roof rail, 122... Roof front member, 124... Roof end member, 126... Vehicle interior, 128, 130, 132, 134, 136, 138, 140, 142 , 144, 146, 148, 150, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180... sealer material

Claims (2)

In a vehicle body structure including a roof panel that covers the upper part of a vehicle interior, the vehicle body structure further includes:
a frame surrounding the outer periphery of the roof panel;
a reinforcing member located on the vehicle interior side of the roof panel and extending across the frame in the vehicle width direction or the vehicle longitudinal direction;
a plurality of sealers applied to a plurality of predetermined locations of the reinforcing member to bond the reinforcing member and the roof panel and having a predetermined damping force;
The volume of the plurality of sealer materials increases as it approaches the center of the roof panel in the vehicle width direction or the center of the vehicle longitudinal direction,
A vehicle body structure characterized in that the distance between the roof panel and the reinforcing member in the vertical direction increases as the distance approaches the center of the roof panel in the vehicle width direction or the center in the longitudinal direction of the vehicle. The area of the plurality of sealers when viewed from above is characterized in that when the reinforcing member and the roof panel are bonded and hardened, the area of the plurality of sealers increases as the distance from the center of the roof panel in the vehicle width direction or the center in the longitudinal direction of the vehicle approaches. The vehicle body structure according to claim 1.

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