Roof panel vibration reduction structure

Abstract

To provide a roof panel vibration reduction structure that can effectively reduce vibration of a roof panel.SOLUTION: A roof panel vibration reduction structure includes: a roof panel of a vehicle; a reinforcement disposed on the lower surface side of the roof panel in a vehicle width direction; and a weight member bonded in the middle in the longitudinal direction of the reinforcement. The weight member includes a first free end and a second free end that are disposed to be separated from each other with the bonded location with the reinforcement interposed therebetween.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration reduction structure for a roof panel.

Background Art

[0002] Patent Document 1 discloses an in-vehicle noise reduction device for reducing in-vehicle noise caused by resonance of a roof panel. In this in-vehicle noise reduction device, a map lamp bracket attached to a roof header portion extends rearward along the roof panel, and the rear end portion of the extended map lamp bracket is fixed in the vicinity including the resonance generation site of the roof panel.

[0003] Patent Document 2 discloses a roof panel vibration damping bracket that adds mass to a roof panel and functions as a mass damper. The roof panel vibration damping bracket is also used, for example, as a bracket for a dome lamp or a map lamp. This roof panel vibration damping bracket extends in the vehicle longitudinal direction and includes a base portion joined to a roof bow, a mass addition portion joined to a roof panel, and a connecting portion connecting the base portion and the mass addition portion. The mass addition portion is joined to the central portion of the roof panel. By this mass addition portion, mass is added to the center of the antinode of the vibration of the roof panel, and the resonance frequency of the roof panel is reduced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the technologies described in Patent Documents 1 and 2, one end of a weight member, such as a map lamp bracket, is joined to the roof header portion, and the other end of the weight member is joined to or near the resonance point of the roof panel. If both ends of the weight member are fixed, even if the end of the weight member is joined to or near the resonance point of the roof panel, the effect of reducing the vibration of the roof panel is small relative to the weight added to the roof panel.

[0006] One of the objectives of the present invention is to provide a roof panel vibration reduction structure that can effectively reduce vibrations of the roof panel. [Means for solving the problem]

[0007] A vibration reduction structure for a roof panel according to one aspect of the present invention is: The vehicle's roof panel and A reinforcement positioned along the vehicle width direction on the underside of the roof panel, The reinforcement comprises a weight member joined to the middle of its longitudinal direction, The weight member comprises a first free end and a second free end, which are positioned apart from each other with respect to the joint with the reinforcement.

[0008] In the vibration reduction structure for the roof panel described above, the straight line connecting the first free end and the second free end may be aligned with the longitudinal direction of the reinforcement. [Effects of the Invention]

[0009] The vibration reduction structure for roof panels of the present invention provides the same effect as a dynamic damper. In the vibration reduction structure for roof panels of the present invention, the weight member functions as a mass damper of the dynamic damper, and the reinforcement functions as a spring of the dynamic damper. By providing the weight member with a first free end and a second free end, the mass damper function of the weight member is greatly enhanced. The reinforcement to which the weight member is joined vibrates in the opposite phase to the vibration of the roof panel. This opposite-phase vibration effectively reduces the vibration of the roof panel.

[0010] When the straight line connecting the first and second free ends aligns with the longitudinal direction of the reinforcement, the reinforcement vibrates more easily throughout its entirety, allowing its spring function to be fully utilized. As a result, vibrations of the roof panel are reduced more effectively. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic diagram of the vibration reduction structure of the roof panel of the embodiment, viewed from the front of the vehicle. [Figure 2] Figure 2 is a schematic diagram of the vibration reduction structure of the roof panel of the embodiment, viewed from the vehicle width direction. [Figure 3] Figure 3 is a schematic diagram of the vibration reduction structure of the roof panel of the embodiment, viewed from above the vehicle. [Figure 4] Figure 4 is an explanatory diagram showing the arrangement of the vibration reduction structure for the roof panel of the embodiment. [Figure 5] Figure 5 is a schematic diagram of the vibration reduction structure of the roof panel of Modification 1, viewed from above the vehicle. [Figure 6] Figure 6 is a schematic diagram of the vibration reduction structure of the roof panel of Modified Example 2, viewed from above the vehicle. [Modes for carrying out the invention]

[0012] A specific example of the vibration reduction structure for the roof panel of the present invention will be described with reference to the drawings. The same reference numerals in the drawings indicate the same parts. In each drawing, some parts of the structure may be exaggerated or simplified for the sake of explanation. The dimensional ratios of each part in the drawings may also differ from those of the actual parts. In the drawings, arrow FR indicates the front side in the longitudinal direction of the vehicle, arrow RR indicates the rear side in the longitudinal direction of the vehicle, arrow RH indicates the right side in the lateral direction of the vehicle, arrow LH indicates the left side in the lateral direction of the vehicle, arrow UP indicates the upper side in the height direction of the vehicle, and arrow LWR indicates the lower side in the height direction of the vehicle.

[0013] <Overview> The roof panel vibration reduction structure 1, as shown in Figure 1, comprises a roof panel 2, a reinforcement 3, and a weight member 5. The reinforcement 3 is a member that reinforces the roof panel 2. The reinforcement 3 is usually joined to an appropriate location on the roof panel 2. The weight member 5 is joined to the reinforcement 3. One of the features of the roof panel vibration reduction structure 1 is that the weight member 5 functions as a mass damper of the dynamic damper, and the reinforcement 3 functions as a spring of the dynamic damper. In this roof panel vibration reduction structure 1, the vibration of the roof panel 2 and the vibration of the reinforcement 3 and weight member 5 are in opposite phase. Each component will be described in detail below.

[0014] <Roof Panel> The roof panel 2 constitutes the upper part of the vehicle body. As shown in Figure 4, the upper frame of the vehicle body consists of left and right roof side rails 91, 91 extending in the longitudinal direction of the vehicle, a front header panel 92 connecting the front ends of the left and right roof side rails 91, 91, and a rear header panel 93 connecting the rear ends of the left and right roof side rails 91, 91. An opening is formed by the left and right roof side rails 91, 91, the front header panel 92, and the rear header panel 93. The roof panel 2 is positioned to cover this opening. The roof panel 2 is joined to the left and right roof side rails 91, 91, the front header panel 92, and the rear header panel 93, respectively.

[0015] <Reinforcement> As shown in FIG. 1, the reinforcement 3 is arranged along the vehicle width direction on the lower surface side of the roof panel 2. The reinforcement 3 is a long member extending in the vehicle width direction. Each end portion 31, 32 of the reinforcement 3 shown in FIG. 1 is joined to the roof side rail 91 shown in FIG. 4. The joining of the reinforcement 3 and the roof side rail 91 is, for example, welding. Each end portion 31, 32 of the reinforcement 3 is connected to the side portions 21, 22 of the roof panel 2.

[0016] At least a part of the intermediate portion in the longitudinal direction of the reinforcement 3 is joined to the lower surface of the roof panel 2. The joining of the reinforcement 3 and the roof panel 2 is, for example, joining by an adhesive 4. The adhesive 4 is, for example, a mastic adhesive having elasticity. The joining of the reinforcement 3 and the roof panel 2 may also be welding. The reinforcement 3 and the roof panel 2 may be joined at at least one location. In this example, the reinforcement 3 and the roof panel 2 are joined at three locations including the substantially central portion in the longitudinal direction of the reinforcement 3. The joining location of the reinforcement 3 and the roof panel 2 can be appropriately selected.

[0017] The cross-sectional shape of the reinforcement 3 is, for example, a hat shape. The cross-section of the reinforcement 3 is a cross-section obtained by cutting the reinforcement 3 with a plane orthogonal to the longitudinal direction of the reinforcement 3. The reinforcement 3 having a hat shape includes a bottom portion 33, two side portions 34, 34, and two flange portions 35, 35 as shown in FIG. 2. Each side portion 34, 34 stands upward from the side edge portion of the bottom portion 33. Each flange portion 35, 35 extends in a direction away from each other from the upper edge portion of each side portion 34, 34. One flange portion 35 extends forward, and the other flange portion 35 extends backward. The reinforcement 3 in this example has a hat-shaped cross-section that is open at the upper side and convex at the lower side.

[0018] As shown in FIG. 4, a plurality of reinforcements 3 are arranged at intervals in the longitudinal direction of the vehicle. The reinforcements 3 shown in FIG. 4 are hatched for easy understanding. Among the plurality of reinforcements 3, the reinforcement 3A located substantially at the center in the longitudinal direction of the vehicle connects the upper end portions of center pillars (not shown). This reinforcement 3A is thicker than the other reinforcements 3.

[0019] <Weight member> The weight member 5 is joined to at least one of the plurality of reinforcements 3. The weight member 5 functions as a mass damper of a dynamic damper. The reinforcement 3 to which the weight member 5 is joined functions as a spring of the dynamic damper. The weight member 5 in this example is composed of a horizontally long portion 7 arranged along the longitudinal direction of the reinforcement 3, as shown in FIG. 3. The weight member 5 includes a first free end 71 and a second free end 72, as shown in FIGS. 1 and 3. The first free end 71 and the second free end 72 enable the weight member 5 to function greatly as a mass damper.

[0020] The weight member 5 is preferably provided on a relatively thin reinforcement 3 among the multiple reinforcements 3. As shown in Figure 3, the width W of the reinforcement 3 to which the weight member 5 is joined is, for example, 60 mm or less. The width W is the widest width in the reinforcement 3. In this example, the width W is the length between the furthest side edges of the two flange portions 35, as shown in Figure 3. The weight member 5 is preferably provided on reinforcements 3B and 3C shown in Figure 4. Reinforcements 3B and 3C are close to reinforcement 3A, which is arranged to connect the upper ends of center pillars (not shown). The roof panel 2 can vibrate vertically with the reinforcement 3A as a node. If the weight member 5 is provided on the relatively thin reinforcements 3B and 3C that are close to the reinforcement 3A, the vibration of the roof panel 2 is more easily and effectively reduced. Regardless of which reinforcement 3 the weight member 5 is installed on, it functions as a mass damper for the dynamic damper.

[0021] As shown in Figures 1 and 3, the weight member 5 is joined to the middle of the reinforcement 3 in the longitudinal direction. The longitudinal direction of the reinforcement 3 is also the vehicle width direction. It is preferable that the weight member 5 is joined to approximately the center of the reinforcement 3 in the longitudinal direction, as shown in Figure 1. When the weight member 5 is joined to the above-mentioned center of the reinforcement 3, the reinforcement 3 can more easily function as a spring for the dynamic damper, and vibrations of the roof panel 2 can be more effectively reduced. The weight member 5 may also be joined to a location other than the above-mentioned center of the reinforcement 3.

[0022] The weight member 5 is preferably joined to the lower surface of the reinforcement 3. When the weight member 5 is joined to the lower surface of the reinforcement 3, the first free end 71 and the second free end 72 of the weight member 5, described later, tend to vibrate in opposite phase to the vibration of the roof panel 2, and the vibration of the roof panel 2 is easily reduced effectively. The weight member 5 may also be joined to the upper surface of the reinforcement 3.

[0023] The joint between the weight member 5 and the reinforcement 3 is, for example, welding. The welding can be, for example, spot welding or arc welding. The joint between the weight member 5 and the reinforcement 3 may also be by adhesive or bolts. In this example, the joint between the weight member 5 and the reinforcement 3 is spot welding. In each figure, the joint location 6 between the weight member 5 and the reinforcement 3 is indicated by an "x".

[0024] There is at least one joint point 6. In this example, there are four joint points 6. As shown in Figure 3, the four joint points 6 in this example are located apart in both the longitudinal and width directions of the reinforcement 3. The width direction of the reinforcement 3 is also the longitudinal direction of the vehicle. Joint points 61 and 62 are the same location in the longitudinal direction of the reinforcement 3, but different locations in the width direction. Joint points 63 and 64 are the same location in the longitudinal direction of the reinforcement 3, but different locations in the width direction. Joint points 61 and 63 are the same location in the width direction of the reinforcement 3, but different locations in the longitudinal direction. Joint points 62 and 64 are the same location in the width direction of the reinforcement 3, but different locations in the longitudinal direction. There may be only one joint point 6.

[0025] In this example, the weight member 5 is composed of a horizontally elongated portion 7. As shown in Figure 3, the horizontally elongated portion 7 has a shape that is long in the longitudinal direction of the reinforcement 3, that is, in the vehicle width direction. In this example, the weight member 5 has a rectangular shape when viewed from above the vehicle. In other words, the weight member 5 in this example is composed of a plate member having an I-shape. When the weight member 5 is composed of a horizontally elongated portion 7, the reinforcement 3 is more likely to vibrate throughout, and the function of the reinforcement 3 as a dynamic damper is greatly exerted, making it easier to more effectively reduce the vibration of the roof panel 2. The weight member 5 may also have a shape that is long in a direction that intersects the longitudinal direction of the reinforcement 3. Other shapes of the weight member 5 will be described in detail in the following modified examples 1 and 2.

[0026] As shown in Figures 1 and 3, the weight member 5 comprises a first free end 71 and a second free end 72, which are positioned apart from each other with respect to the joint 6 with the reinforcement 3. The first free end 71 and the second free end 72 are not fixed to any other member, including the reinforcement 3. In the weight member 5 formed by the transversely elongated portion 7, the first free end 71 and the second free end 72 are positioned apart in the longitudinal direction of the reinforcement 3, i.e., in the vehicle width direction.

[0027] In the weight member 5 formed by the horizontally elongated portion 7, the straight line connecting the first free end 71 and the second free end 72 aligns with the longitudinal direction of the reinforcement 3. Multiple straight lines can be taken to connect the first free end 71 and the second free end 72. Of these multiple straight lines, at least one must align with the longitudinal direction of the reinforcement 3. In this example, the weight member 5 has a rectangular shape, and the straight line connecting the first free end 71 and the second free end 72 includes a line along the long side of the weight member 5.

[0028] The ends of the first free end 71 and the second free end 72 may be straight lines extending perpendicular to the longitudinal direction of the reinforcement 3, or they may be inclined straight lines extending in a direction that intersects the longitudinal direction of the reinforcement 3 non-perpendicular to it. The ends of the first free end 71 and the second free end 72 may be curves such as circular arcs. Regardless of the shape of the ends of the first free end 71 and the second free end 72, at least one of the multiple straight lines connecting the first free end 71 and the second free end 72 must be aligned with the longitudinal direction of the reinforcement 3.

[0029] The weight member 5 vibrates in phase with the reinforcement 3. The weight member 5 is provided to adjust the resonant frequency of the reinforcement 3. The first free end 71 and the second free end 72 are positioned so that the resonant frequency of the reinforcement 3 to which the weight member 5 is joined is substantially the same as the resonant frequency of the roof panel 2. The resonant frequency of the reinforcement 3 to which the weight member 5 is joined is preferably within ±10% of the resonant frequency of the roof panel 2. It is preferable that the resonant frequency of the reinforcement 3 to which the weight member 5 is joined matches the resonant frequency of the roof panel 2.

[0030] The length L1 from the joint 6 to the first free end 71 and the length L2 from the joint 6 to the second free end 72 (Figure 3) are appropriately selected so that the resonant frequency of the reinforcement 3 to which the weight member 5 is joined is substantially the same as the resonant frequency of the roof panel 2. Lengths L1 and L2 are the lengths along the straight line connecting the first free end 71 and the second free end 72. In this example, lengths L1 and L2 are the lengths along the longitudinal direction of the reinforcement 3. Length L1 is based on the joints 61 and 62 closest to the first free end 71. Length L2 is based on the joints 63 and 64 closest to the second free end 72.

[0031] Each of lengths L1 and L2 is greater than, for example, the width W of reinforcement 3 (Figure 3). Lengths L1 and L2 may be the same or different. In this example, lengths L1 and L2 are the same.

[0032] If there are multiple joints 6 at different locations along the longitudinal direction of the reinforcement 3, lengths L1 and L2 can be appropriately selected such that the sum of lengths L1 and L2 is greater than length L0 (Figure 3). Length L0 is the length between joints 61, 62 and joints 63, 64.

[0033] Lengths L1 and L2 also vary depending on the width W, thickness, and material of the weight member 5. For example, if the thickness of the weight member 5 is relatively thin, and lengths L1 and L2 are long, the first free end 71 and the second free end 72 are more prone to vibration. The vibration of the first free end 71 and the second free end 72 makes it easier for the weight member 5 to function as a mass damper in a dynamic damper, and the vibration of the roof panel 2 is more easily reduced. The lengths L1, L2, width W, thickness, and material of the weight member 5 can be appropriately selected so that the weight member 5 does not detach from the reinforcement 3 due to vibration, and the first free end 71 and the second free end 72 do not come into contact with the reinforcement 3 or ceiling material, etc.

[0034] The shape of the weight member 5 corresponds to the hat shape of the reinforcement 3. As shown in Figure 2, the weight member 5 comprises a recess 53, two protrusions 55, 55, and two flange portions 57, 57. The recess 53 is recessed in accordance with the bottom 33 and two side portions 34, 34 of the reinforcement 3. Each protrusion 55 protrudes upward relative to the bottom of the recess 53, corresponding to each side portion 34 and each flange portion 35 of the reinforcement 3. Each flange portion 57, 57 extends away from each other from the side edge of each protrusion 55. One flange portion 57 extends forward, and the other flange portion 57 extends backward. When the weight member 5 has a concave and convex shape with a recess 53 and protrusions 55, bending deformation of the weight member 5 is easily suppressed.

[0035] In this example, the top surface of the convex portion 55 of the weight member 5 is joined to the flange portion 35 of the reinforcement 3. The weight member 5 may also be a flat plate. A weight member 5 made of a flat plate is joined, for example, to the bottom portion 33 of the reinforcement 3.

[0036] In the weight member 5 of this example, as shown in Figure 2, the side portions 73 and 74 of the horizontally elongated portion 7 are also free ends. Even though the side portions 73 and 74 are free ends, the first free end 71 and the second free end 72, which are located a certain distance from the joint 6, contribute significantly to reducing the vibration of the roof panel 2. Being located a certain distance from the joint 6 means that the length from the joint 6 to each free end is greater than the width W of the reinforcement 3 (Figure 3). The above length may be, for example, more than 60 mm, 100 mm or more, or 150 mm or more.

[0037] The weight member 5 is, for example, a steel plate. The steel plate is, for example, a cold-rolled steel plate such as SPCC, or a cold-rolled high-tensile steel plate such as SPFC.

[0038] <effect> In the vibration reduction structure 1 of the roof panel described above, the weight member 5 functions as a mass damper of the dynamic damper, and the reinforcement 3 functions as a spring of the dynamic damper. For example, when the roof panel 2 is displaced upward in the direction of the white arrow shown in Figure 1, the weight member 5's central portion is displaced upward in the same direction as the roof panel 2, and the first free end 71 and the second free end 72 are displaced downward in the direction of the black arrow shown in Figure 1.

[0039] The weight member 5, having a first free end 71 and a second free end 72, fully utilizes its function as a mass damper, effectively reducing vibrations of the roof panel 2. In particular, when the weight member 5 is composed of a horizontally elongated portion 7, the reinforcement 3 is more prone to vibration throughout, fully utilizing its function as a dynamic damper, and reducing vibrations of the roof panel 2 more effectively.

[0040] <Example 1> The weight member 5 may be composed of a vertically elongated portion 8, as shown in Figure 5. The vertically elongated portion 8 has a shape that is elongated in a direction perpendicular to the longitudinal direction of the reinforcement 3, that is, in the vehicle's front-rear direction. In this example, the weight member 5 has a rectangular shape when viewed from above the vehicle. The weight member 5 made of the vertically elongated portion 8 also has a first free end 81 and a second free end 82 that are spaced apart from each other, with the joint 6 with the reinforcement 3 in between. In the weight member 5 made of the vertically elongated portion 8, the first free end 81 and the second free end 82 are spaced apart in a direction perpendicular to the longitudinal direction of the reinforcement 3, that is, in the vehicle's front-rear direction. The first free end 81 and the second free end 82 are not fixed to any other member, including the reinforcement 3.

[0041] The weight member 5 in this example is made of a flat plate. The weight member 5 in this example is joined to the lower surface of the bottom 33 of the reinforcement 3. There are two joining points 6 in this example. The two joining points 65 and 66 in this example are located apart in the longitudinal direction of the reinforcement 3, as shown in Figure 5. The joining points 65 and 66 are the same location in the width direction of the reinforcement 3, but different locations in the longitudinal direction. There may be only one joining point 6.

[0042] The length L3 from the joint 6 to the first free end 81 and the length L4 from the joint 6 to the second free end 82 are appropriately selected so that the resonant frequency of the reinforcement 3 to which the weight member 5 is joined is substantially the same as the resonant frequency of the roof panel 2.

[0043] The weight member 5 may have a shape such that recesses and protrusions are aligned in the front-rear direction of the vehicle, corresponding to the hat shape of the reinforcement 3. The weight member 5 having recesses and protrusions may be joined to, for example, the flange portion 35 of the reinforcement 3.

[0044] In this example, the weight member 5 also has free ends on the sides 83 and 84 of the elongated section 8. Even though the sides 83 and 84 are free ends, the first free end 81 and the second free end 82, which are located a certain distance, for example more than 60 mm, from the joint 6, are what contribute most significantly to reducing the vibration of the roof panel 2.

[0045] The weight member 5 may have an elongated shape in a direction that intersects the longitudinal direction of the reinforcement 3 non-orthogonally.

[0046] Even with the configuration of Modified Example 1, the weight member 5 functions as a mass damper of the dynamic damper, and the reinforcement 3 functions as a spring of the dynamic damper. By providing the weight member 5 with a first free end 81 and a second free end 82, the mass damper function of the weight member 5 is greatly enhanced, and the vibration of the roof panel 2 (Figure 1) is effectively reduced.

[0047] <Modification 2> As shown in Figure 6, the weight member 5 may have both a horizontally elongated portion 7 and a vertically elongated portion 8. The horizontally elongated portion 7 has a shape that is long in the longitudinal direction of the reinforcement 3, that is, in the vehicle width direction. The vertically elongated portion 8 has a shape that is long in the direction perpendicular to the longitudinal direction of the reinforcement 3, that is, in the vehicle front-rear direction. The weight member 5 in this example has a cross shape when viewed from above the vehicle. In other words, the weight member 5 in this example has a shape in which two I-shaped plate members intersect perpendicularly. The intersection of these I-shaped plate members is, for example, the joining point 6 to the reinforcement 3. The horizontally elongated portion 7 has a first free end 71 and a second free end 72 that are spaced apart from each other with the joining point 6 to the reinforcement 3 in between. The vertically elongated portion 8 has a first free end 81 and a second free end 82 that are spaced apart from each other with the joining point 6 to the reinforcement 3 in between.

[0048] Even with the configuration of Modified Example 2, the weight member 5 functions as a mass damper of the dynamic damper, and the reinforcement 3 functions as a spring of the dynamic damper. By having first free ends 71, 81 and second free ends 72, 82 of the weight member 5, the function of the weight member 5 as a mass damper is greatly enhanced, and the vibration of the roof panel 2 (Figure 1) is effectively reduced. In particular, by having a horizontally elongated portion 7 of the weight member 5, the reinforcement 3 is more prone to vibration throughout, and the function of the reinforcement 3 as a dynamic damper is greatly enhanced, resulting in a more effective reduction of the vibration of the roof panel 2 (Figure 1).

[0049] <Variation 3> The weight member may be composed of an X-shaped plate member or a T-shaped plate member, although these are not shown in the diagram.

[0050] The X-shaped plate member has a shape in which two I-shaped plates intersect non-orthogonally. In other words, the X-shaped plate member has a shape in which leg pieces extend in all four directions from the intersection of the two plates. This intersection is, for example, the point of connection to the reinforcement. The X-shaped plate member is joined to the reinforcement such that, for example, each leg piece extending in all four directions from the intersection intersects non-orthogonally in both the longitudinal direction and the width direction of the vehicle.

[0051] The T-shaped plate member comprises an I-shaped first piece and an I-shaped second piece extending from the center of the first piece in a direction perpendicular to the first piece. The connection point between the first and second pieces is, for example, the connection point to the reinforcement. The T-shaped plate member is joined to the reinforcement such that, for example, the first piece extends along the vehicle width direction and the second piece extends along the vehicle longitudinal direction. In this case, both ends of the first piece are the first and second free ends. Furthermore, the end of the second piece distal to the first piece is also a free end.

[0052] Even in the configuration of Modified Example 3, the weight member functions as the mass damper of the dynamic damper, and the reinforcement functions as the spring of the dynamic damper.

[0053] The present invention is not limited to these examples, but is intended to include all modifications within the meaning and scope of the claims as shown, and equivalents thereof. [Explanation of Symbols]

[0054] 1. Vibration reduction structure for roof panels 2 roof panel, 21, 22 side 3,3A,3B,3C Reinforcement 31,32 End 33 Bottom, 34 Side, 35 Flange 4. Adhesive 5. Weight component 53 recess, 55 protrusion, 57 flange 6, 61, 62, 63, 64, 65, 66 Joint locations 7 horizontal section, 71 first free end, 72 second free end, 73, 74 side sections 8 Long section, 81 First free end, 82 Second free end, 83, 84 Side sections 91 Roof side rails, 92 Front header panel, 93 Rear header panel L0, L1, L2, L3, L4 Length, W Width

Claims

[Claim 1] The vehicle's roof panel and A reinforcement positioned along the vehicle width direction on the underside of the roof panel, The reinforcement comprises a weight member joined to the middle of its longitudinal direction, The weight member comprises a first free end and a second free end, which are positioned apart from each other with respect to the joint with the reinforcement. The straight line connecting the first free end and the second free end is along the longitudinal direction of the reinforcement. The first free end and the second free end vibrate in opposite phase to the vibration of the roof panel. Vibration reduction structure for the roof panel.

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