JP3468275B2 - Damping structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure applied to suppress vibration of a steel sheet forming a body of an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, a steel plate 1 such as a floor portion 1a, a dash portion 1b, a trunk room portion 1c, etc. of an automobile has a structure shown in FIG.
As shown in Fig. 3, petroleum asphalt, polyester fiber, vinylon fiber,
A sheet-shaped damping member 2 made of a composite material of synthetic fibers such as acrylic fibers, latex resin, rubber, talc, calcium carbonate and the like is attached.

The floor section 1a and the trunk room section 1c
In the case of a steel sheet that spreads in the horizontal direction such as, the vibration damping member 2 press-formed along the shape is installed in the coating line of the automobile, and the steel sheet is melted by the heat when passing through the paint heating and drying furnace. It is worn. Further, in the case of a steel plate having a standing surface such as the dash portion 1b, an adhesive is applied to the damping member 2 in advance and temporarily fixed at a desired position, and then the floor portion 1
The vibration damping member 2 is fused to the steel plate by the heat of passing through the heating and drying furnace, as in the case of the steel plate such as a and the trunk room portion 1c. As the damping member 2, a sheet-like member having a substantially rectangular shape with one side of 20 cm to 50 cm is generally used, and a plurality of these substantially rectangular sheet-like damping members are arranged side by side as necessary. Or
It is fused to the steel sheet with the shape modified as necessary.

[0004]

However, if the damping member having the substantially rectangular shape as described above is installed on many surfaces of the steel sheet, it contributes to the damping property of the steel sheet, but the weight of the vehicle is significantly reduced. It will lead to an increase. For example, in a medium-sized passenger car, a damping member of about 14 kg is used, and these damping members correspond to particularly heavy parts among the constituent parts of an automobile, which is a great obstacle to reducing the weight of the automobile. ing.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to suppress the vibration of a steel plate or the like forming an automobile by using a vibration damping member. An object of the present invention is to provide a vibration damping structure capable of suppressing an increase in weight due to the use of the vibration damping member, that is, reducing the weight as compared with the conventional structure.

[0006]

Means for Solving the Problems The inventors of the present invention have diligently studied the relationship between the vibration damping member and the vibration damping performance in order to solve the above-mentioned problems of the prior art. The installation shape of the damping member was specified, and the present invention was completed.

[0007]

That is, in the vibration damping structure according to claim 1 of the present invention, a resin damping member for suppressing the vibration of the damping plate is attached to the damping plate that requires damping. In the vibration damping structure, the vibration damping member is radially arranged on the surface of the vibration-damped plate from the region where the center of gravity of the vibration-damped plate is located toward the outer peripheral portion of the region requiring vibration damping. A line which is attached and extends in the direction parallel to the long side of the region requiring damping and passing through the center of gravity of the plate to be damped is included as the internal division point such as N, etc. Of the N-1 points internally divided into minutes, they are radially attached from the region where each internal division point closest to both ends is located toward the outer peripheral portion.

According to a second aspect of the present invention, there is provided a damping structure in which a damping member made of resin for suppressing vibration of the damping plate is attached to the damping plate that requires damping. A vibration structure, wherein the damping member is on the surface of the damping plate,
The length of the region that is radially attached from the region where the center of gravity of the damping plate is located to the outer peripheral portion of the region that requires damping and that passes through the center of gravity of the damping plate and that requires the damping Of the N-1 points that internally divide the line extending in the direction parallel to the side into N equal parts including the point where the center of gravity is located as an internally dividing point,
Radially pasted from the area where each interior division point closest to both ends is located toward the outer peripheral portion, and the area where the center of gravity is located in the area sandwiched between the areas where the interior division points are located. The structure is such that it is attached so as to extend through it.

A damping structure according to claim 3 of the present invention is the damping structure according to claim 1 or 2, wherein the damping member is made of a water-based paint.

The damping structure according to claim 4 of the present invention is the damping structure according to claim 3, wherein the water-based paint has a continuous line shape on the surface of the damping plate. It is also arranged in a part of the area along the contour line that defines the area that requires damping.

The damping structure according to claim 5 of the present invention is the damping structure according to any one of claims 1 to 4.
The area occupied by the vibration damping member is 70% or less of the area of the region of the vibration damping plate that requires vibration damping.

The damping structure according to claim 6 of the present invention is the damping structure according to any one of claims 1 to 5, wherein the damping plate and the damping plate attached to the damping plate are provided. The vibration absorbing member has a structure in which a non-woven fabric sound absorbing member including a main fiber and a binder fiber is laminated.

[0014]

According to the damping structure according to the first aspect of the present invention, the region where the center of gravity of the vibration-damped plate that requires vibration damping is located, that is, the vibration-damped plate needs to be damped. Since the damping member is attached radially from the central part of the area to be struck, it is possible to efficiently suppress the vibration of the central part with the largest amplitude, and to pass the center of gravity and suppress the vibration. N−1 internal division points (for example, 6 equal divisions) that internally include the point where the center of gravity is located as a line extending in the direction parallel to the long side of the required region as an internal division point (for example, 6 divisions) Of the 5 points), the radial attachment is made from the area where each internal division point is closest to both ends to the outer peripheral part of the area requiring damping, so that even for vibration modes of multiple orders Vibration can be efficiently suppressed. Specifically, when the number of antinodes of vibration in one side direction is m and the number of antinodes of vibration in other side directions orthogonal to this one side is n, in a vibration mode represented as (m, n), It is possible to efficiently suppress the vibration in the (1,3) mode, which has the second largest contribution to the radiated sound after the (1,1) mode.

[0015]

Further, since the vibration damping member is partially and radially attached to the surface of the vibration-damped plate, the vibration-damping structure can be reduced in weight.

According to the damping structure of the second aspect of the present invention, the region in which the center of gravity of the vibration-damped plate is located, that is, the central portion of the region where the vibration-damped plate needs to be dampened is outwardly moved. Since vibration damping members are attached radially toward the center, it is possible to efficiently suppress the vibration of the central part with the largest amplitude, and to pass through the center of gravity and parallel to the long side of the region that requires vibration suppression. From the both ends of N-1 internal division points (for example, 5 points) that divide the line extending in the direction into N equal divisions (for example, 6 equal divisions) including the point where the center of gravity is located as an internal division point Since it is radially attached from the area where the nearest internal division points are located to the outer periphery of the area that requires vibration suppression, it is possible to efficiently suppress vibration even in vibration modes of multiple orders. it can. Specifically, when the number of antinodes of vibration in one side direction is m and the number of antinodes of vibration in other side directions orthogonal to this one side is n, in a vibration mode represented as (m, n), It is possible to efficiently suppress the vibration in the (1,3) mode, which has the second largest contribution to the radiated sound after the (1,1) mode.

Further, since it is attached so as to extend through the area where the center of gravity is located in the area sandwiched between the areas where the interior division points are closest from both ends,
The rigidity of the damping plate can be further improved.

Further, since the vibration damping member is partially and radially attached to the surface of the vibration-damped plate, the vibration-damping structure can be reduced in weight.

According to the damping structure of the third aspect of the present invention, since the water-based paint is used as the vibration-damping member, the water-based paint is applied to a desired position on the surface of the vibration-damped plate. Therefore, the damping member having a desired shape can be easily arranged.

According to the damping structure of claim 4 of the present invention, when the water-based coating material as the damping member is applied onto the surface of the vibration-damped plate, a continuous process is performed using a spray gun or the like. Can be applied, and the productivity in the step of disposing the vibration damping member can be improved.

According to the damping structure of the fifth aspect of the present invention, it is possible to further reduce the weight of the damping structure while suppressing the vibration of the damping plate.

Even if a damping member is attached on the surface of the vibration-damped plate, it is possible to secure a suitable uneven shape, and the surface of the vibration-damped plate and the vibration-damped member having this uneven shape can be secured. When laminating another layer, for example, a nonwoven fabric sound absorbing material layer, the unevenness of the nonwoven fabric sound absorbing material layer can be effectively engaged with each other to prevent the displacement of the two layers, and a solid laminated structure can be obtained.

According to the vibration damping structure of the sixth aspect of the present invention, the vibration damping plate can be reduced in weight and the sound passing through the vibration damping plate can be reduced, that is, the sound insulation can be achieved. It is possible to improve the sex.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a vibration damping structure 10 in which a vibration damping member 20 is attached to a body steel plate 11, a door steel plate 12, etc. as a vibration-damped plate forming an underbody of an automobile. . The body steel plate 11 is composed of a floor portion 11a including a center tunnel portion 11a ', a dash portion 11b, a trunk portion 11c, and the like. It is radially attached from the part toward the outer peripheral portion of this area, that is, toward the contour line 21, and passes through the center of gravity of the vibration-damped plate, that is, the center of gravity of each section such as the body steel plate 11 and the long side of each section. Out of the five points that divide the line that extends in the parallel direction into six equal parts including the point where the center of gravity of the section is located as the internal division point, the area that is closest to the two ends from the outer periphery of the section A damping member 20 made of a resinous damping material having a shape extended toward the portion is attached. In addition, also on the surface of the door steel plate 12, the damping member 2 is similarly formed.
0 is pasted.

As the damping material for forming the damping member 20, a water-soluble resin using acrylic, acrylic-styrene, vinyl acetate, vinyl acetate-acrylic, ethylene-vinyl acetate, epoxy, etc., alone or in combination, or , Water-dispersible resin or emulsion as the main constituent, barium sulfate, calcium carbonate, talc, clay,
Water-based paint composed of water and filler such as mica, diatomaceous earth, and also styrene, isoprene, styrene copolymer, hydrogenated dicyclopentadiene as a main component, filling of calcium carbonate, silica, carbon black, mica, etc. A water-based paint composed of wood is desirable.

Particularly, when the water-based paint is used as the damping material, the damping member 20 can be easily formed into a desired shape. Further, since the water-based paint can be applied using a device such as a spray gun, if it is continuously applied to a necessary area of the body steel plate 11 or the like, the productivity in the production line can be improved.

After the damping member 20 is attached to the body steel plate 11 or the like as described above, as shown in FIG. A sheet-shaped non-woven fabric sound absorbing member 30 and a sheet-shaped skin member 31 made of fibers and binder fibers are laminated.

By laminating the non-woven sound absorbing member 30 in this manner, the sound transmitted through the steel plate 11 can be reduced and the sound insulation can be improved.

Further, since the non-woven fabric sound absorbing member 30 is laminated so as to be meshed with the uneven surface formed by the surface of the vibration damping member 20 and the exposed surface of the body steel plate 11, lateral displacement or the like occurs even after the lamination. Does not cause
It will be held securely in the desired position.

Here, the shape of the damping member 20 attached to the body steel plate 11 or the like will be described with reference to FIGS. 3 to 9.

FIG. 3 shows a case in which the region of the body steel plate 11 where damping is required is a rectangular steel plate 41. On the surface of this steel plate 41, the damping member 51 is
The center of gravity 41g of the steel plate 41, that is, the contour line that defines the contour from the central portion, that is, the midpoints 4 of the sides 41a and 41b
It is radially attached so as to extend toward 1d.
Further, it is attached so as to extend from one point 41h on the damping member attached so as to connect the center of gravity position 41g and the midpoint 41d to the apex 41c.

As described above, first, the damping member 51 is provided in the central portion of the steel plate 41. The number of antinodes of vibration in the direction of the side 41a is m, and the number of antinodes of vibration in the direction of the side 41b is n. Then, in the case of the vibration of the mode represented by (m, n) = (1,1), the amplitude of this central portion becomes the largest, so by suppressing the amplitude of this central portion to the vibration or the vibration. This is because noise can be efficiently reduced.

Further, the vibration damping member 51 is provided so as to connect the points 41h other than the central portion 41g and the respective vertices 41c.
(M, n) is (1,3), (2,3), (3,3),
This is to effectively suppress the vibration of the modes represented by (1,4), (2,4) and the like.

According to the above configuration, the vibration of the steel plate 41 can be efficiently suppressed while being lightweight.

FIG. 4 shows a case where the region of the body steel plate 11 that requires damping is a pentagonal steel plate 42. On the surface of this steel plate 42, the damping member 52 is
It is radially attached so as to extend from the center of gravity 42g of the steel plate 42, that is, the central portion, toward each midpoint 42d of each side 42a, 42b, 42b ', 42b''as a contour line. Further, they are radially attached so as to extend from the point 42h other than the center of gravity position 42g toward the two vertices 42c.

According to the above construction, it is possible to reduce the weight and efficiently suppress the vibration of the steel plate 42.

FIG. 5 shows a case where the region of the body steel plate 11 requiring damping is a steel plate 41 having a rectangular shape similar to that shown in FIG. 3, and on the surface of this steel plate 41. The damping member 53 has a center of gravity position 41 of the steel plate 41.
g, that is, each side 41a, 42 which is a contour line from the central portion
It is radially attached so as to extend toward the midpoint 41d of b. Further, they are radially attached so as to extend from points 41h other than the center of gravity position 41g toward each vertex 41c and each middle point 41d of the side 41a.

As described above, first, the damping member 53 is provided in the central portion of the steel plate 41. The number of vibration antinodes in the direction of the side 41a is m, and the number of vibration antinodes in the direction of the side 41b is n. Then, in the case of the vibration of the mode represented by (m, n) = (1,1), the amplitude of this central portion becomes the largest, so by suppressing the amplitude of this central portion to the vibration or the vibration. This is because noise can be efficiently reduced.

Further, the vibration damping member is provided so as to connect the central portion 41g and each midpoint 41d to (m, n) is (2,
1), (1, 2), (3, 1), (1, 3), (4
This is to effectively suppress the vibration of the modes represented by 1), (1, 4), etc.

Further, among the three inner dividing points which divide the line 41h other than the center of gravity position 41g (the line passing through the center of gravity position 41g and extending in the direction parallel to the long side 41a into four) into four equal parts, each of the inner parts closest to both ends. (M, n) is (1, 3), the vibration damping member 53 is provided so as to connect each vertex 41c) to each vertex 41c.
This is to effectively suppress the vibration of the modes represented by (2,3), (3,3), (1,4), (2,4) and the like.

Further, the vibration damping member 53 is connected so as to connect the point 41h other than the center of gravity position 41g and each middle point 41d of each side 41a.
Is provided because (m, n) is (1,3), (2,3),
This is because the vibrations of the modes represented by (3, 3), (1, 4), (2, 4) and the like can be suppressed more efficiently.

According to the above structure, the vibration of the steel plate 41 can be efficiently suppressed while being lightweight.

FIG. 6 shows a case where the region of the body steel plate 11 that requires damping is the rectangular steel plate 41. On the surface of the steel plate 41, the damping member 54 is provided.
Are radially attached so as to extend from the center of gravity 41g of the steel plate 41, that is, the central portion, toward the midpoint 41d of each side 41a as a contour line. Also, the center of gravity position 41g
Of the five internal division points that divide the line segment that passes through and is parallel to the long side 41a into six equal parts, the two points closest to both ends, that is, the internal division point 4
It is attached so as to extend from 1i toward the apex 41c between the sides 41a and 41b and further toward the midpoint 41d of the long side 41a.

As described above, first, the damping member 54 is provided in the central portion of the steel plate 41. The number of vibration antinodes in the direction of the side 41a is m, and the number of vibration antinodes in the direction of the side 41b is n. Then, in the case of the vibration of the mode represented by (m, n) = (1,1), the amplitude of this central portion becomes the largest, so by suppressing the amplitude of this central portion to the vibration or the vibration. This is because noise can be efficiently reduced.

Further, the vibration damping member 51d is provided radially so as to extend from the inner dividing point 41i toward the apex 41c, in particular, the mode (3, 1) is effectively suppressed, and vibration or noise accompanying vibration is generated. This is because it can be efficiently reduced.

According to the above structure, the vibration of the steel plate 41 can be efficiently suppressed while being lightweight.

FIG. 7 shows a case where the region of the body steel plate 11 requiring damping is the rectangular steel plate 41. On the surface of the steel plate 41, the damping member 55 is provided.
Are radially attached from the center of gravity 41g of the steel plate 41, that is, from the central portion toward the midpoint 41d of each side 41a as a contour line. Also, passing through the center of gravity position 41g, side 41a
Among the internal division points that divide the line parallel to the line into 6 equal parts, the two points closest to both ends, that is, the internal division point 41i to each side 41a, 41
toward the apex 41c between the two b's and the middle point 41 of the side 41a
It is radially attached so as to extend toward d.

Further, it is attached so as to extend through the center of gravity 41g in the area sandwiched between the areas where the two internal division points 41i are located.

As described above, first, the damping member 55 is provided in the central portion of the steel plate 41. The number of antinodes of vibration in the direction of the side 41a is m, and the number of antinodes of vibration in the direction of the side 41b is n. Then, in the case of the vibration of the mode represented by (m, n) = (1,1), the amplitude of this central part becomes the largest, so by suppressing the amplitude of this central part to be small This is because noise can be efficiently reduced.

Further, from the interior dividing point 41i to each side 41a, 41
Providing the damping member 55 radially so as to extend toward the apexes 41c between the b's makes it possible to effectively suppress the mode (3, 1) in particular and efficiently reduce the vibration or the noise accompanying the vibration. Because you can.

Further, it is further necessary to provide the vibration damping member 55 so as to connect the regions sandwiched by the internal division points 41i by further adding (3
This is because the mode 1) can be efficiently suppressed and the vibration or the noise accompanying the vibration can be further efficiently reduced.

According to the above structure, the vibration of the steel plate 41 can be efficiently suppressed while being lightweight.

FIG. 8 shows a case where the region of the body steel plate 11 requiring damping is the rectangular steel plate 41. On the surface of the steel plate 41, the damping member 56 is formed.
Are radially attached from the center of gravity 41g of the steel plate 41, that is, from the central portion toward the midpoints 41d of the sides 41a and 41b as contour lines. In addition, among the internally dividing points that internally divide the line parallel to the side 41a through the center of gravity position 41g into six equal parts,
4 points on each side from the two points closest to both ends, that is, the internal division point 41i
Further, a side 41a is provided toward the apex 41c between 1a and 41b.
Are radially attached so as to extend toward the respective midpoints 41d.

As described above, first, the damping member 56 is provided in the central portion of the steel plate 41 by setting the number of antinodes of vibration in the direction of the side 41a as m and the number of antinodes of vibration in the direction of the side 41b as n. Then, in the case of the vibration of the mode represented by (m, n) = (1,1), the amplitude of this central part becomes the largest, so by suppressing the amplitude of this central part to be small This is because noise can be efficiently reduced.

Further, from the interior dividing point 41i to each side 41a, 41
Providing the damping member 56 radially so as to extend toward the apexes 41c between the b's makes it possible to effectively suppress the mode (3, 1) in particular and efficiently reduce the vibration or the noise accompanying the vibration. Because you can.

Further, since the damping member 56 is attached so as to connect the regions sandwiched by the internal dividing points 41i, it is possible to further contribute to the reduction of the mode (3, 1).

According to the above structure, the vibration of the steel plate 41 can be efficiently suppressed while being lightweight.

FIG. 9 shows the coating procedure when a water-based paint is used as the damping material. As shown in FIG. 9, on the surface of the steel plate 41 having a rectangular shape, the water-based paint as the damping member 57 starts from one midpoint 41d and goes to all other midpoints 41d and all vertices 41c. It is applied so that it is a continuous line that passes with one stroke.

That is, the damping member 57 is arranged in a partial region along the sides 41a and 41b (see FIG. 9) as contour lines so that it can be applied with a single stroke.

With the above structure, when the water-based paint is applied using a device such as a spray gun, the discharge is turned on and off.
It is not necessary to perform FF, and coating can be continuously performed in the ON state. Thereby, the productivity in the production line can be improved.

Next, a vibration damping structure in which vibration damping members made of various materials and shapes are stuck on a rectangular test steel plate is prepared, and a vibration test is performed on these vibration damping structures to transmit vibration. The results of examining the characteristics will be described.

Here, the vibration exciter 110 is shown in FIG.
As shown in (a) and (b), a vibrating frame including the vibrating source 111 and a vibrating frame 112 that can be reciprocally moved in the vertical direction at a high frequency by the vibrating source 111 is used. 1
With respect to No. 12, the outer peripheral portion of the steel plate 101 of the vibration damping structure 100 was fixed, the vibration pickup 113 was attached on the vibration damping member 102 located in the substantially central portion of the fixed steel plate 101, and the vibration level was measured. The results will be described below as Reference Example 1, Examples 1 to 6 and Comparative Examples 1 and 2.

[0065]

[Reference Example 1] As the steel plate 101, the short side × long side × thickness is 3
Using a rectangular shape having a size of 00 mm × 500 mm × 1.6 mm, a damping member 102 made of an asphalt damping material having a thickness of 4 mm is stuck on the entire surface of the steel plate 101 to form a damping structure 100. Formed.

Then, with respect to the damping structure 100,
A vibration test was performed using the above-described vibration exciter 110 to evaluate vibration transfer characteristics. The results are shown in FIG. 12, FIG. 14, FIG.
As shown in FIGS. 18, 20, 22, and 24.

[0067]

Example 1 As a steel plate 101, the short side × long side × thickness is 3
A rectangular shape of 00 mm × 500 mm × 1.6 mm is used, and on the surface of the steel plate 101, a shape as shown in FIG. 11 (a central portion, that is, the center of gravity position 101 g is connected to each midpoint 101 d and the center of gravity position 101 g And the short side 10
Asphalt control with a thickness of 5 mm so as to form a shape that connects the vertex 101c with the interior division point 101h closest to the points 101d at both ends among the points that divide the line connecting the midpoint 101d of 1b into four equal parts. A damping member 102a made of a damping material was attached to form a damping structure 100a.

Then, a vibration test was carried out on the vibration damping structure 100a using the above-mentioned vibration generator 110 to evaluate the vibration transmission characteristics. As a result, as shown in FIG. 12, the vibration reduction characteristics were at an excellent level as compared with Reference Example 1 in which the damping member was provided on the entire surface.

[0069]

Example 2 As the steel plate 101, the short side × long side × thickness is 3
A rectangular shape of 00 mm × 500 mm × 1.6 mm is used, and on the surface of the steel plate 101, a shape as shown in FIG. 13 (a central portion, that is, the center of gravity position 101 g is connected to each midpoint 101 d and the center of gravity position 101 g And the short side 10
1b is a shape that connects the inner dividing point 101h closest to the points 101d at both ends among the points dividing the line connecting the midpoint 101d to the midpoint 101d and the midpoint 101d of the apex 101c and the long side 101a). As described above, the damping member 102b made of asphalt damping material having a thickness of 5 mm is attached, and the damping structure 10 is formed.
0b was formed.

Then, a vibration test was carried out on the vibration damping structure 100b using the above-mentioned vibration generator 110 to evaluate the vibration transmission characteristics. As a result, as shown in FIG. 14, the vibration reduction characteristics were at an excellent level as compared with Reference Example 1 in which the damping member was provided on the entire surface.

[0071]

Third Embodiment As the steel plate 101, the short side × long side × thickness is 3
Using a rectangular shape of 00 mm × 500 mm × 1.6 mm, on the surface of the steel plate 101, a shape as shown in FIG. 15 (the central portion, that is, the center of gravity position 101 g and each midpoint 101 d of the long side 101 a are connected, And the center of gravity 1
6 lines connecting 01g and each midpoint 101d of the short side 101b
5 mm thick asphalt damping material so that the inner connection point 101i, which is closest to the end points 101d, and the apex 101c and the midpoint 101d of the long side 101a are connected to each other. The vibration damping member 102c made of was attached to form the vibration damping structure 100c.

Then, a vibration test was conducted on the vibration damping structure 100c using the above-mentioned vibration generator 110 to evaluate the vibration transmission characteristics. As a result, as shown in FIG. 16, the vibration reduction characteristics were at an excellent level as compared with Reference Example 1 in which the vibration damping member was provided on the entire surface.

[0073]

Fourth Embodiment As the steel plate 101, the short side × long side × thickness is 3
A rectangular shape of 00 mm × 500 mm × 1.6 mm is used, and on the surface of the steel plate 101, a shape as shown in FIG. 17 (the center portion, that is, the center of gravity position 101 g and each midpoint 101 d of the long side 101 a are connected, And the center of gravity 1
6 lines connecting 01g and each midpoint 101d of the short side 101b
Among the equally dividing points, the inner dividing point 101i closest to the end points 101d is connected to each vertex 101c and the midpoint 101d of the long side 101a, and further, a shape connecting both inner dividing points 101i). Thus, a damping member 102d made of an asphalt damping material having a thickness of 5 mm was attached to form a damping structure 100d.

Then, a vibration test was conducted on the vibration damping structure 100d using the above-mentioned vibration generator 110 to evaluate the vibration transmission characteristics. As a result, as shown in FIG. 8, the vibration reduction characteristics were at an extremely excellent level as compared with Reference Example 1 in which the damping member was provided on the entire surface.

[0075]

Fifth Embodiment As the steel plate 101, the short side × long side × thickness is 3
A rectangular shape of 00 mm × 500 mm × 1.6 mm was used, and on the surface of the steel plate 101, a shape as shown in FIG.
Of the points that divide the line connecting the center points 101d of 01a and 101b and the center of gravity position 101g and the middle points 101d of the short sides 101b into 6 equal parts, the inner division closest to the end points 101d. Point 101i, each vertex 101c, and long side 101
thickness 5 so that it has a shape that connects with the midpoint 101d of a).
mm damping material 102e made of asphalt damping material
Was attached to form a damping structure 100e.

Then, a vibration test was carried out on the vibration damping structure 100e using the above-mentioned vibration generator 110 to evaluate the vibration transmission characteristics. As a result, as shown in FIG. 20, as compared with Reference Example 1 in which the vibration damping member was provided on the entire surface, the vibration reduction characteristic was at a very excellent level.

[0077]

Sixth Embodiment As the steel plate 101, the short side × long side × thickness is 3
A rectangular shape of 00 mm × 500 mm × 1.6 mm was used, and on the surface of the steel plate 101, a shape as shown in FIG. 21 (center portion, that is, the center of gravity position 101 g and side 1
Of the points that divide the line connecting the center points 101d of 01a and 101b and the center of gravity position 101g and the middle points 101d of the short sides 101b into 6 equal parts, the inner division closest to the end points 101d. Point 101i, each vertex 101c, and long side 101
A damping member 102f made of a water-based paint having a thickness of 5 mm is attached (applied) so that the shape connecting the midpoint 101d of a with a single stroke can be applied), and the damping structure 1
00f was formed.

The water-based paint used here was an emulsion of acrylic / styrene / vinyl acetate 25%, pigment 1
2.5%, mica 21%, additive 13.5%, water 28%
It consisted of

Then, a vibration test was carried out on the vibration damping structure 100f using the above-mentioned vibrator 110 to evaluate the vibration transfer characteristics. As a result, as shown in FIG. 22, the vibration reduction characteristics were at an extremely excellent level as compared with Reference Example 1 in which the vibration damping member was provided on the entire surface.

[0080]

[Comparative Example 1] As the steel plate 101, short side x long side x thickness is 3
Using a rectangular shape of 00 mm x 500 mm x 1.6 mm, a steel plate 101 having a thickness of 5 mm is formed so as to have a shape (frame shape connecting outer peripheral portions) as shown in Fig. 23 on the surface. Damping member 10 made of material
2 g was attached to form a damping structure 100 g.

Then, a vibration test was performed on the vibration damping structure 100g using the above-mentioned vibration generator 110 to evaluate the vibration transmission characteristics. As a result, as shown in FIG. 24, the vibration reduction characteristic was at a level inferior to that of Reference Example 1 in which the vibration damping member was provided on the entire surface.

[0082]

[Comparative Example 2] As the steel plate 101, the short side × long side × thickness is 3
A rectangular shape of 00 mm × 500 mm × 1.6 mm was used, and on the surface of the steel plate 101, a shape as shown in FIG. 25 (center portion, that is, the center of gravity position 101 g and side 1
Of the points that divide the line connecting the center points 101d of 01a and 101b and the center of gravity position 101g and the middle points 101d of the short sides 101b into 6 equal parts, the inner division closest to the end points 101d. Point 101i, each vertex 101c, and long side 101
A vibration damping member 102h having a thickness of 5 mm and made of the same water-based paint as in Example 6 is attached so as to have a shape wider than that shown in FIG. (Coating) to form a damping structure 100h.

Then, a vibration test was carried out on the vibration damping structure 100h using the above-mentioned vibrator 110 to evaluate the vibration transmission characteristics. As a result, the vibration reduction characteristic was at the same level as that of the example 5 shown in FIG. 20, but the weight reduction could not be achieved due to the wide coating area, and the unevenness of the surface with the water-based coating was It became smaller, and it became easy to slip even if sheet-shaped nonwoven fabric sound absorbing members were laminated.

The results obtained above are summarized in Table 1. In Table 1, all numerical values are relative values expressed as a percentage when reference example 1 was set to 100, ∘ indicates an equivalent level superior to reference example 1, and ∘ indicates reference example 1. The level is extremely superior to that of the reference example, and the mark x indicates a level inferior to that of the reference example 1.

[0085]

[Table 1]

Next, the results of evaluating the noise level of the actual vehicle by attaching the damping member to the body steel plate of the actual vehicle will be described as Examples 7 and 8 and Reference Example 2. The vehicle used was an AT specification with an engine displacement of 2000 cc,
The noise level was measured at a fixed second speed and an engine speed of 30.
The sound pressure level at the ear position was measured when the vehicle was running at a constant speed of 00 rpm.

[0087]

[Embodiment 7] As shown in FIG. 26, a floor portion 1 of a body steel plate 11 including a floor portion 11a including a center tunnel portion 11a ', a dash portion 11b, a trunk portion 11c and the like.
The vibration damping member 20 was formed by coating the 1a with a water-based paint having a thickness of 5 mm so as to have a shape as shown in Example 5 and the like.

The water-based paint used here was an emulsion of acrylic / styrene / vinyl acetate 25%, pigment 1
2.5%, mica 21%, additive 13.5%, water 28%
It consisted of

Further, with the vibration damping member 20 being stuck, a non-woven sound absorbing member having a structure as shown in FIG.

After that, an evaluation was made by running the vehicle under the above-mentioned conditions.

[0091]

[Embodiment 8] As shown in FIG. 1, for the floor portion 11a including the center tunnel portion 11a 'of the body steel plate 11, the dash portion 11b, the trunk portion 11c, and the door steel plate 12, as shown in Embodiment 5 and the like. Of the vibration damping member 2 by applying a water-based paint similar to that of Example 7 to a thickness of 5 mm so as to obtain a uniform shape.
Formed 0.

Further, with the vibration damping member 20 being stuck, a non-woven sound absorbing member having a structure as shown in FIG.

After that, an evaluation was made by running the vehicle under the above-mentioned conditions.

[0094]

[Reference Example 2] Center tunnel portion 11 of body steel plate 11
With respect to the floor portion 11a including a ', the dash portion 11b, the trunk portion 11c, and the door steel plate 12, a thickness of 4 mm is applied to the entire region requiring vibration damping so as to have a shape as shown in Example 5 and the like. A damping member made of asphalt damping material was attached.

Further, with the above-mentioned damping member attached,
On top of that, a non-woven sound absorbing member having a structure as shown in FIG.

After that, an evaluation was made by running the vehicle under the above-mentioned conditions.

The experimental results obtained in the above Examples 7 and 8 and Reference Example 2 are shown in FIG. As can be understood from the results shown in FIG. 27, as compared with Reference Example 2 in which a damping member made of an asphalt damping material is attached in a shape as shown in Example 5, etc., the floor including the center tunnel portion 11a ′ Part 11
Example 7 in which a vibration damping member made of a water-based paint is radially attached only to a has excellent sound insulation performance, and further, the floor portion 11a of the body steel sheet 11, the dash portion 11b, the trunk portion 11e, and the door steel sheet 12 are provided. Example 8 in which the vibration damping member made of the water-based paint was attached to the result showed further excellent sound insulation performance.

In the embodiments described above, the case where the body steel plate of the automobile is used as the damping plate constituting the damping structure is shown, but the invention is not limited to this and damping is required. The present invention can also be applied to other vehicles such as motorcycles and trains, and steel plates used in factory equipment and the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment in which a damping structure according to the present invention is applied to a steel plate of an automobile.

FIG. 2 is a cross-sectional view showing a structure of an example of a vibration damping structure according to the present invention.

FIG. 3 is a plan view showing an example of an arrangement shape of a vibration damping member according to the present invention.

FIG. 4 is a plan view showing an example of an arrangement shape of a vibration damping member according to the present invention.

FIG. 5 is a plan view showing an example of an arrangement shape of a vibration damping member according to the present invention.

FIG. 6 is a plan view showing an embodiment of the arrangement shape of the damping member according to the present invention.

FIG. 7 is a plan view showing an example of an arrangement shape of a vibration damping member according to the present invention.

FIG. 8 is a plan view showing an example of an arrangement shape of a vibration damping member according to the present invention.

FIG. 9 is a plan view showing an embodiment of the arrangement shape of the damping member according to the present invention.

10A and 10B are diagrams showing a vibration exciter used in a vibration test, in which FIG. 10A is an external perspective view and FIG. 10B is a side view.

FIG. 11 is a plan view showing an arrangement shape of a vibration damping member in the first embodiment.

FIG. 12 is a graph showing vibration transfer characteristics obtained in Example 1.

FIG. 13 is a plan view showing an arrangement shape of a vibration damping member in the second embodiment.

FIG. 14 is a graph showing the vibration transfer characteristics obtained in the second embodiment.

FIG. 15 is a plan view showing an arrangement shape of a vibration damping member in the third embodiment.

16 is a graph showing the vibration transfer characteristics obtained in Example 3. FIG.

FIG. 17 is a plan view showing an arrangement shape of a vibration damping member in the fourth embodiment.

FIG. 18 is a graph showing vibration transfer characteristics obtained in Example 4.

FIG. 19 is a plan view showing an arrangement shape of a vibration damping member in the fifth embodiment.

20 is a graph showing vibration transfer characteristics obtained in Example 5. FIG.

FIG. 21 is a plan view showing an arrangement shape of a vibration damping member in the sixth embodiment.

22 is a graph showing the vibration transfer characteristics obtained in Example 6. FIG.

23 is a plan view showing an arrangement shape of a vibration damping member in Comparative Example 1. FIG.

FIG. 24 is a graph showing vibration transfer characteristics obtained in Comparative Example 1.

FIG. 25 is a plan view showing an arrangement shape of a vibration damping member in Comparative Example 2.

FIG. 26 is a perspective view showing an arrangement shape of a vibration damping member in the seventh embodiment.

27 is a graph showing sound insulation characteristics of actual vehicles obtained in Examples 7 and 8 and Reference Example 2. FIG.

FIG. 28 is a perspective view showing an arrangement shape of a conventional damping member on a body steel plate of an automobile.

[Explanation of symbols]

10 Damping Structure 11 Body Steel Plate (Damped Plate) 11a Floor 11a 'Center Console (Floor) 11b Dash 11c Trunk 12 Door Steel 20 Damping Member 21 Contour 30 Nonwoven Sound Absorbing Member 31 Skin Member 41 Steel plate (damped plate) 41a, 41b Side (outline) 41c Vertex 41d Midpoint 41g Center of gravity position 41h, 41i Internal division point 42 Steel plate (damped plate) 42a, 42b, 42b ', 42b''Side (outline) Line) 42c vertex 42d center point 42g center of gravity position 42h internal division point 51, 52, 53, 54, 55, 56, 57 damping member 101 steel plate (damped plate) 101c vertex 101d center point 101g center of gravity position 101h, 101i Minute points 102a, 102b, 102c, 102d, 102e,
102f, 102g, 102h Damping member

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP 63-80010 (JP, A) JP 9-104842 (JP, A) JP 7-68696 (JP, A) Actual development 57- 180131 (JP, U) (58) Fields examined (Int.Cl. ⁷ , DB name) F16F 15/00-15/08 B32B 5/02 B62D 25/00-25/08 B62D 25/14-25/22 F01M 11/00-13/06 F02F 1/00-1/42 F02F 7/00

Claims (6)

(57) [Claims] 1. A vibration damping structure in which a resin vibration damping member that suppresses vibration of the vibration damping plate is attached to a vibration damping plate that requires vibration damping, wherein the vibration damping member is , on the surface of the object to be vibration plate, wherein with being stuck radially toward the outer periphery of the area requiring damping from a region located in the center of gravity of the damper plate, before Symbol the
The long side of the area that passes through the center of gravity of the damping plate and that requires damping
The line that extends in the parallel direction is internally divided into the points where the center of gravity is located.
Both ends of N-1 points that are internally divided into N equal parts including points
Damping mass, characterized in that it is affixed to the radially towards the area or al the outer peripheral portion positioned internally dividing point closest from each. 2. A vibration damping structure in which a resin vibration damping member for suppressing the vibration of the vibration damping plate is attached to the vibration damping plate requiring vibration damping, wherein the vibration damping member is , On the surface of the vibration-damped plate, radially attached from the region where the center of gravity of the vibration-damped plate is located to the outer peripheral portion of the region that requires vibration suppression, and the center of gravity of the vibration-damped plate. Of the N-1 points that internally divide into N equal parts including the point where the center of gravity is located as a point of internal division, which extends in the direction parallel to the long side of the region requiring damping, The innermost points are radially attached from the region where the closest inner dividing points are located toward the outer peripheral portion , and
The position of the center of gravity in the area sandwiched between the areas
A damping structure, wherein the damping structure is attached so as to extend through a region where 3. The damping member is made of a water-based paint.
The damping structure according to claim 1 or 2, characterized in that 4. Before SL water-based paints, the target damping plate on the surface of
Area that requires damping in a continuous line
Is also arranged in a partial area along the contour line that defines the
Damping structure according to claim 3 Symbol mounting, characterized in that. Area occupied by 5. Before SL damping member, the be damped
70% or less of the area of the plate that requires vibration control
Damping structure according to one of the four noise Zureka claims 1, characterized in. 6. Before Symbol the damper plate and affixed is the to be damped plate
The main fiber and binder fiber
Claim 1 that you characterized by laminating a nonwoven acoustical member that
To damping structure according to one 5 Neu Zureka.