JP4288704B2 - Car body floor panel structure - Google Patents

Description

  The present invention relates to a floor panel structure for a vehicle body, and more particularly, to a floor panel structure for a vehicle body constituting a floor of an automobile by floor panels connected to a plurality of frame members arranged in the vehicle body longitudinal direction and the vehicle width direction. Related.

  Vibration from the frame member to which the engine and suspension are connected is transmitted to the floor panel, and this floor panel vibrates. As a result, unpleasant vehicle interior vibration and noise are generated by greatly vibrating the air in the vehicle interior. It is known. In this case, vibrations of the engine itself and road noise transmitted from the suspension become a problem as the vibration source. This road noise is generally caused by tire cavity resonance and suspension resonance.

  Conventionally, in order to suppress these vibration noises, damping materials and vibration-proofing materials are generally pasted as various vibration-proofing and sound-proofing measures on each part of the floor panel and the vehicle body in the vicinity thereof. . This can reduce vibration and noise, but on the other hand, it requires a very large amount of damping material and anti-vibration material, which increases the weight of the vehicle, thereby causing various adverse effects and costs. There was a big problem.

  Furthermore, unpleasant vibrations transmitted from the engine and suspension are mainly 400 Hz or less in automobiles, and particularly have a peak at a frequency around 250 Hz, which is road noise caused by tire cavity resonance. It is also known to increase the rigidity by forming a large number of beads or increasing the panel thickness, thereby shifting the natural frequency of the floor panel to a high band higher than 400 Hz. That is, the floor panel does not resonate at the resonance frequency of the suspension, the cavity resonance frequency band of the tire, or the like, thereby reducing unpleasant vibration noise.

  In this case, there is an advantage that the resonance peak in the low frequency region can be suppressed, but on the other hand, the vibration in the high frequency region increases on the contrary, so that a damping material and a vibration isolating material for suppressing vibration noise in the high frequency region are provided. In the same manner as described above, the weight of the vehicle increases, and as a result, there are various adverse effects and costs, and it has been desired to solve this problem.

  On the other hand, in the vehicle body panel structure described in Patent Document 1, a plurality of shell structure convex portions that are resistant to bending, compression, and tension are formed on the panel, and concave portions extending vertically and horizontally between the convex portions. The vibration is damped by concentrating the vibration and providing a damping material in the recess.

JP-A-6-107235

However, various auxiliary machines, seats, etc. are arranged below and above the vehicle body of the floor panel, and since a plurality of frame members can be arranged only in a limited position from the viewpoint of vehicle body strength and vehicle body structure, the frame member The panel region surrounded by the frame cannot be formed in a desired shape or size, and therefore it may be difficult to reduce the vibration by applying the vehicle body panel structure described in Patent Document 1.
Further, in the above-described method of attaching a vibration damping material or a vibration damping material to the entire surface of the floor panel, there are problems that the material cost increases and the weight of the vehicle body increases due to the heavy use of the vibration damping material. In addition, when the panel thickness is increased, the vehicle weight increases.

Here, if the vibrations can be concentrated largely on a part of the floor panel, the vibration energy is reduced by converting the vibration energy into heat energy by the damping ability of the material constituting the floor panel. As a result, an attempt was made to solve the problems of the prior art described above.
Accordingly, the present invention has been made to solve the above-described problems of the prior art, and reduces vibration energy of the floor panel transmitted from the frame member of the vehicle body, thereby reducing acoustic radiation from the floor panel. The object is to provide a floor panel structure of a vehicle body that can be used.

In order to achieve the above object, the present invention provides a vehicle body constituting a vehicle floor by a floor panel connected to a plurality of frame members arranged in the vehicle longitudinal direction and the vehicle width direction and connected to an engine or a suspension. In the floor panel structure, a panel region surrounded by a frame member or a vibration restricting portion that restricts the frame member and the vibration region is formed in the floor panel, and the panel region of the floor panel is itself A high-rigidity part protruding upward or downward is formed, and a low-rigidity part is formed substantially flat around the high-rigidity part, and a part of the high-rigidity part is a frame member and / or a vibration regulating part. The vibration damping material is provided only in the entire region of the low rigidity portion in the panel region of the floor panel .
In the present invention configured as described above, a high-rigidity portion that protrudes upward or downward is formed in the panel region of the floor panel, and a low-rigidity portion is formed around the high-rigidity portion. Since it is formed substantially flat, vibration energy concentrates on the low rigidity portion due to the difference in rigidity between the high rigidity portion and the low rigidity portion. Furthermore, since a part of the highly rigid portion is formed so as to be in contact with the frame member and / or the vibration restricting portion, the rigidity of the highly rigid portion can be greatly increased. Therefore, for example, when the panel area is relatively small and the panel area itself has a relatively high rigidity, or when the panel area is small in width and a high-rigidity part is provided, the difference in rigidity from the surrounding low-rigidity part can be greatly increased. Even when there is not, a large difference in rigidity can be obtained, and vibration energy can be reliably concentrated on the low rigidity portion. And the vibration energy concentrated largely in the low-rigidity part is converted into thermal energy by the damping ability of the material constituting the floor panel. As a result, the vibration energy of the entire panel area can be reduced, and acoustic radiation from the panel area can be reduced. Further, in the present invention, in the panel region of the floor panel, the vibration damping material is provided only in the entire region of the low rigidity portion, that is, no vibration damping material is provided in the region of the high rigidity portion. While maintaining this reduction effect, the amount of damping material can be reduced to reduce the weight of the vehicle body.

In the present invention, preferably, the high-rigidity part is formed in a substantially rectangular shape, and all or a part of one side thereof is in contact with the frame member or the vibration regulating part.
In the present invention configured as described above, all or a part of one side of the highly rigid portion formed in a substantially rectangular shape is in contact with the frame member or the vibration restricting portion, so that the rigidity of the highly rigid portion is more reliably ensured. Can be increased.

In the present invention, preferably, the low-rigidity portion includes a portion extending in a U shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity.
In the present invention configured as described above, the low-rigidity portion includes a portion extending in a U shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity. Can be obtained more reliably, and vibration energy can be effectively concentrated on the portion extending in a U-shape.

In the present invention, preferably, the high-rigidity part is formed in a substantially rectangular shape, and all or a part of each of the two adjacent sides is in contact with the frame member or the vibration regulating part.
In the present invention configured as above, since all or a part of each of the two adjacent sides of the highly rigid portion formed in a substantially rectangular shape is in contact with the frame member or the vibration restricting portion, the highly rigid portion The rigidity of the can be increased more reliably.

In the present invention, preferably, the low-rigidity portion includes a portion extending in an L shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity.
In the present invention configured as described above, the low-rigidity portion includes a portion extending in an L shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity. Can be obtained more reliably, and vibration energy can be effectively concentrated on the portion extending in an L shape.

In the present invention, preferably, the high-rigidity portion extends from a portion in contact with the frame member and / or the vibration regulating portion to a substantially central portion of the panel region.
In the present invention configured as described above, the high-rigidity portion extends from the portion in contact with the frame member and / or the vibration regulating portion to the substantially central portion of the panel region. The high-rigidity part can be extended to increase the difference in rigidity between the high-rigidity part and the low-rigidity part, and low on the periphery of the three or two sides that are not in contact with the frame member or vibration regulating part of the high-rigidity part. Vibration energy can be more reliably concentrated on a rigid portion, for example, a low-rigidity portion extending in a U shape or an L shape.

In the present invention, it is preferable that the substantially rectangular high-rigidity portion has a curved side in contact with the frame member, and is in contact with the frame member or the vibration regulating portion at a substantially middle portion of the side.
In the present invention configured as described above, the substantially rectangular high-rigidity portion is in contact with the frame member or the vibration restricting portion at substantially the middle portion of the side in contact with the frame member or the vibration restricting portion. A gap is formed between the restriction portion. Such a gap can prevent the rigidity of the low-rigidity portion near the gap from increasing. As a result, it is possible to prevent the range where the vibration energy is concentrated from becoming too narrow. Furthermore, the rigidity of the high-rigidity portion can be further increased by the side extending in a curved line.

In the present invention, preferably, two panel regions are formed by sharing one frame member among the frame member or the vibration regulating portion, the high-rigidity portion is in contact with the shared frame member, and It is formed over two panel areas.
In the present invention configured as described above, two panel regions are formed by sharing one frame member among the frame member or the vibration regulating portion, and the high rigidity portion is in contact with the shared frame member, And since it forms over two panel area | regions, the rigidity of a highly rigid part can be improved greatly by contacting a frame member with high rigidity. As a result, a large difference in rigidity from the low-rigidity portions of the two panel regions can be obtained.

In the present invention, it is preferable that two panel regions are formed by sharing one vibration restricting portion of the frame member or the vibration restricting portion, and the shared vibration restricting portion forms the floor panel in a straight line. The high-rigidity part is in contact with the foldable part and is formed over two panel regions.
In the present invention configured as described above, two panel regions are formed by sharing one vibration restricting portion of the frame member or the vibration restricting portion, and the shared vibration restricting portion is a floor panel. It is a fold part formed by bending in a straight line, and the high-rigidity part is in contact with the fold part and formed over two panel regions. Therefore, the high-rigidity part is formed by bending in a straight line. By making contact, the rigidity of the high rigidity portion can be greatly increased. As a result, a large difference in rigidity from the low-rigidity portions of the two panel regions can be obtained.

In the present invention, it is preferable that the high-rigidity portion is formed in a substantially rectangular shape and disposed at a substantially middle portion of the shared frame member or vibration restricting portion, and the low-rigidity portion is formed between the two panel regions. Each includes a portion extending in a U shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity.
In the present invention configured as described above, the high-rigidity portion formed in a substantially rectangular shape is disposed at a substantially middle portion of the shared frame member or vibration restricting portion, and the low-rigidity portion includes two panel regions. In each of the two panel regions, a portion extending in a U-shape with a predetermined width is included so as not to increase the rigidity around the high-rigidity portion, so that it is possible to more reliably obtain a range in which vibration energy is concentrated in each of the two panel regions. In addition, the vibration energy can be effectively concentrated on the portion extending in a U-shape.

In the present invention, preferably, the high-rigidity portion is formed in a substantially rectangular shape and disposed at the end of the shared frame member or vibration restricting portion, and the low-rigidity portion is provided in each of the two panel regions. , A portion extending in an L shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity.
In the present invention configured as described above, the high-rigidity portion formed in a substantially rectangular shape is disposed at the end of the shared frame member or vibration regulating portion, and the low-rigidity portion includes two panel regions. Since each includes a portion extending in an L shape with a predetermined width so as not to increase the rigidity around the high rigidity portion, it is possible to more reliably obtain a range in which vibration energy is concentrated in each of the two panel regions. At the same time, vibration energy can be effectively concentrated on the portion extending in an L shape.

In the present invention, it is preferable that the high-rigidity portion extends from a portion in contact with the frame member or the vibration restricting portion to a substantially central portion in one or both of the two panel regions.
In the present invention configured as described above, the high-rigidity portion extends from the portion in contact with the frame member or the vibration regulating portion to substantially the central portion in one or both of the two panel regions. The high-rigidity portion extends to a substantially lower central portion, so that the difference in rigidity between the high-rigidity portion and the low-rigidity portion can be increased, and a range where vibration energy is concentrated can be obtained more reliably.

In the present invention, preferably, the high-rigidity part is formed with a reinforcing bead extending from the side of the contacting frame member and / or vibration regulating part toward the low-rigidity part.
In the present invention configured as described above, the high rigidity portion is formed with a reinforcing bead extending from the side of the contacting frame member and / or vibration regulating portion toward the low rigidity portion. The rigidity of the frame member and / or the vibration restricting portion in contact with the low-rigidity portion in the direction from the low-rigidity portion side is increased, and the low-rigidity portion extending around the low-rigidity portion side toward which the reinforcing bead of the high-rigidity portion is directed. The difference in rigidity between the portion and the high rigidity portion can be further increased. As a result, vibration energy can be largely concentrated in the low rigidity portion.

In the present invention, preferably, the high rigidity portion is formed with a reinforcing bead extending so as to extend over two panel regions.
In the present invention configured as described above, since the reinforcing beads extending so as to extend over the two panel regions are formed, the rigidity in the direction over the two panel regions is increased, and in each of the two panel regions, the high-rigidity portion is provided. The rigidity difference between the low-rigidity portion extending around the side in the direction in which the reinforcing beads extend and the high-rigidity portion can be further increased. As a result, vibration energy can be largely concentrated in the low rigidity portion.

In the present invention, it is preferable that the high-rigidity portion is in contact with a frame member having a smaller amount of vibration transmission from the engine or the suspension among the plurality of frame members.
In the present invention configured as described above, the high rigidity portion is in contact with the frame member having a smaller amount of vibration transmission from the engine or the suspension among the plurality of frame members, so that a large vibration is not transmitted to the high rigidity portion. I can do it. As a result, it is possible to prevent acoustic radiation caused by vibration directly transmitted from the frame member to the high-rigidity portion and vibrations transmitted to the low-rigidity portion via the high-rigidity portion from increasing.

In the present invention, it is preferable that the frame member includes a side frame extending in the longitudinal direction of the vehicle body and a plurality of cross members connected to the side frame via a connecting portion and extending in the vehicle width direction. Among them, the connecting portion of the predetermined cross member is relatively lower in connection rigidity than the other cross members, and the high rigidity portion is in contact with the predetermined cross member.
In the present invention configured as described above, among the plurality of cross members that are connected to the side frame extending in the longitudinal direction of the vehicle body via the connecting portion and extend in the vehicle width direction, the connecting portion of the predetermined cross member is the other cross member. Since the connection rigidity is relatively lower than that of the members, side frames that extend in the longitudinal direction of the vehicle body where vibrations from the engine and suspension are easily transmitted, for example, the front and The amount of vibration transmitted to the predetermined cross member is reduced from side sills extending in the direction, floor side frames extending in the vehicle body front-rear direction formed inward in the vehicle width direction of the side sills, and the like. And since a highly rigid part contacts this predetermined | prescribed cross member, it can prevent that a big vibration is transmitted to a highly rigid part. As a result, it is possible to prevent acoustic radiation caused by vibration directly transmitted from the frame member to the high-rigidity portion and vibrations transmitted to the low-rigidity portion via the high-rigidity portion from increasing.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration energy of the floor panel transmitted from the frame member of the vehicle body can be reduced, and the acoustic radiation from the floor panel can be reduced.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an underbody of an automobile having a vehicle body floor panel structure according to first to third embodiments of the present invention.
As shown in FIG. 1, an underbody 1 of an automobile includes a plurality of frame members and a plurality of floor panels 2, 4, 6, 8 connected to these frame members and constituting a floor portion (floor portion) of a passenger compartment. 10, 12, 14, 16.

  First, the frame member will be described with reference to FIG. As shown in FIG. 1, the frame members include a front side frame 18, a side sill 20, a floor side frame 22, a rear side frame 24 that extend in the vehicle longitudinal direction, and a No. 2 frame that extends in the vehicle width direction. 1 to No. No. 9 cross members 26-34 and No. 9 provided in the longitudinal direction of the vehicle body provided between these floss members. 1 to No. Three tunnel side members 36-38.

  A pair of front side frames 18 having a closed cross-sectional structure extending in the longitudinal direction of the vehicle body so as to surround the engine room from both the left and right sides are provided at a front portion of the underbody 1 of the automobile. At the front end of the vehicle body of these front side frames 18, a closed cross-sectional structure No. 1 which is a reinforcing member in the vehicle width direction is provided. One cross member 26 is joined, and an engine 40 and a front suspension cross member 42 are attached to the front side frame 18, and a front suspension 44 is attached to the front suspension cross member 42.

The rear end portions of the pair of front side frames 18 are No. 1 extending in the vehicle width direction at the end portion of the floor portion on the vehicle body front side. 2 It is joined to the cross member 27. This No. The two cross members 27 are attached to a downward inclined portion of a dash panel (not shown) that partitions the vehicle compartment and the engine compartment, and a pair of torque box members 27a having a closed cross-sectional structure provided outside the vehicle body of each front side frame 18. And a dash lower cross member 27b having a closed cross-sectional structure disposed so as to be sandwiched between the front side frames 18.
This No. A pair of side sills 20, a pair of floor side frames 22, and a pair of rear side frames 24, which are reinforcing members in the longitudinal direction of the vehicle body, are provided on the floor portion behind the two cross members 27.

  The pair of side sills 20 has a closed cross-sectional structure, and the front end portion thereof is No. The two cross members 27 are joined to both ends in the vehicle width direction. These side sills 20 are No. 3 cross member 28 and No. 3 No. 4 from almost the middle position of the cross member 29. The four inner side edges of the cross member 29 are curved inward in the vehicle width direction.

  A pair of U-shaped floor side frames 22 extending in the longitudinal direction of the vehicle body are provided between the side sills 20, and the front end portions of the floor side frames 22 are connected to the rear end portions of the front side frames 18. In addition to being joined, 2 It is joined to the cross member 27. These floor side frames 22 are No. 3 cross member 28 and no. 4 so that it protrudes inward in the vehicle width direction between the cross member 29 and 22a. No. 4 connecting portion 29a and No. 4 cross member 29. The connecting portion 30a with the 5 cross member 30 is bent in the vehicle width direction, and the other portions extend linearly.

The rear end portions of the floor side frames 22 are joined to the front end portions of the rear side frames 24 each having a U-shaped cross section and extending in the longitudinal direction of the vehicle body. Further, the front end portions of these rear side frames 24 bend outward in the vehicle width direction, and are also joined to the inner side surface of the side sill 20 in the vehicle width direction. The front end portion has a reinforcing member extending in the vehicle width direction. 24a is provided.
These rear side frames 24 extend to the edge of the floor portion on the rear side of the vehicle body. No. 7 cross member 32 and No. 7 A rear suspension cross member 46 is attached between the eight cross members 33 and a rear suspension 48 is attached to the rear suspension cross member 46.

As the reinforcing member in the vehicle width direction, the above-mentioned No. 1 cross member 26 and No. 1 2 In addition to the cross member 27, each of the No. 3 to No. No. 8 cross members 28 to 33 and closed cross-sectional structure No. 8 Nine cross members 34 are provided.
No. 3 cross member 28 is No.3. 2 provided on the vehicle body rear side of the cross member 27. 2 It extends linearly in the vehicle width direction in parallel with the cross member 27. This No. The three cross members 28 are joined to the side sills 20 at both left and right ends in the vehicle width direction, and intersect the floor side frame 22 and are joined to the floor side frame 22 on both the left and right sides in the vehicle width direction.

  This No. No. 3 on the vehicle body rear side of the cross member 28. No. 3 which extends linearly in the vehicle width direction parallel to the cross member 28 4 cross members 29 are provided, and both left and right ends in the vehicle width direction are joined to the side sill 20, and the floor side frame 22 is intersected and joined to the floor side frame 22 on both the left and right sides in the vehicle width direction. Yes. These No. 3 and no. The four cross members 28 and 29 protrude upward at a substantially central position in the vehicle width direction where the floor tunnel portion 50 is provided.

No. No. 4 on the vehicle body rear side of the cross member 29. 5 cross member 30, No. 5 6 cross member 31, No. 6 7 cross members 32 are provided, and the cross members 30 to 32 extend linearly in the vehicle width direction in parallel to each other. This No. The left and right ends of the cross member 30 in the vehicle width direction are joined to the floor side frame 22 respectively. 6 and no. The left and right ends in the vehicle width direction of the seven cross members 31 and 32 are joined to the rear side frame 24, respectively.
No. 7 on the rear side of the vehicle body of the cross member 32, the center of the vehicle width direction is curved forward. Eight cross members 33 are provided so as to extend in the vehicle width direction, and left and right end portions in the vehicle width direction are respectively joined to the rear side frame 24.
This No. No. 8 having a closed cross-sectional structure extending linearly in the vehicle width direction at the rear edge of the vehicle body of the floor portion on the vehicle body rear side of the 8 cross member 33. Nine cross members 34 are provided, and both left and right ends in the vehicle width direction are joined to the rear ends of the rear side frame 24, respectively.

In addition to the front side frame 18, the side sill 20, the floor side frame 22, and the rear side frame 24 described above, the reinforcing members in the longitudinal direction of the vehicle body are arranged in the longitudinal direction of the vehicle body at the edges on both sides in the vehicle width direction of the floor tunnel portion 50. No. with a U-shaped cross section. 1 to No. Three tunnel side members 36 to 38 are disposed.
No. 1 tunnel side member 36 is No.1. 2 cross member 27 and No. 2 3 extends linearly across the cross member 28, and both end portions in the longitudinal direction of the vehicle body are respectively No. 2 cross member 27 and No. 2 3 It is joined to the cross member 28.

No. 2 The tunnel side member 37 is 4 cross member 29 and no. 5 extends linearly between the cross member 30 and both end portions in the longitudinal direction of the vehicle body are respectively No. 5 and No. 5 cross members 30. 4 cross member 29 and no. 5 is joined to the cross member 30.
No. 3 tunnel side member 38 is No.3. 6 cross member 31 and No. 6 7 extends linearly across the cross member 32, and both ends in the longitudinal direction of the vehicle body are respectively No. 7 and No. 7 cross member 32. 6 cross member 31 and No. 6 7 is joined to the cross member 32.

  The frame member having the U-shaped cross section described above, that is, the floor side frame 22, the rear side frame 24, No. 2 3 to No. 8 cross members 28 to 33 and No. 8 1 to No. Each of the three tunnel side members 36 to 38 is formed such that an open portion having a U-shaped cross section faces upward of the vehicle body, and the lower surface of each floor panel 2, 4, 6, 8, 10, 12, 14, 16 is These are joined to the flange portion of each frame member to form a substantially rectangular closed cross section.

Next, the floor panel will be described with reference to FIG. As shown in FIG. 1, an underbody 1 of an automobile is provided with first to eighth floor panels 2, 4, 6, 8, 10, 12, 14, and 16 each integrally formed by press-molding steel plates. .
The first floor panel 2 is No. 2 cross member 27, a pair of side sills 20, and A floor tunnel portion 50 is provided so as to cover the space surrounded by the three cross members 28 and bulges upward so as to extend in the vehicle longitudinal direction at a substantially central position in the vehicle width direction. The front edge of the first floor panel 2 is No. 2 is joined to the vehicle body rear side surface of the cross member 27, and the bottom surfaces of the remaining three sides are connected to the pair of side sills 20 and No. 2 side sill 20. 3 on the left and right sides in the vehicle width direction. The lower surface of the 1 tunnel side member 36 and the floor side frame 22 are joined.

In addition, the first floor panel 2 has a No. 1 on both the left and right sides of the floor tunnel portion 50. 2 cross member 27 and No. 2 A bent portion 52 is formed extending in a straight line shape in the vehicle width direction in parallel with the three cross member 28. The bent portion 52 is bent in a straight line so that the first floor panel 2 extends in a dogleg shape in the longitudinal direction of the vehicle body.
The first floor panel 2 is formed with eight panel regions S1 to S8 surrounded by the frame members 20, 22, 27, 28, 36 and the bent portion 52, and among these regions, the panel region S5 is formed. Thru | or S8 is extended diagonally upward toward the vehicle body back with respect to panel area | region S1 thru | or S4.

  The second floor panel 4 is No. 3 cross member 28, a pair of side sills 20, and A floor tunnel portion 50 is provided so as to cover the space surrounded by the four cross members 29 and bulges upward so as to extend in the vehicle longitudinal direction at a substantially central position in the vehicle width direction. As for this 2nd floor panel 4, the lower surface of the edge of the 4 sides is No.2. 3 cross member 28, a pair of side sills 20, and The lower surface is bonded to the floor side frame 22 on both the left and right sides in the vehicle width direction.

In addition, a fold portion 54 that is bent in a straight line is formed at both edges in the vehicle width direction of the floor tunnel portion 50 of the second floor panel 4, and the floor tunnel portion 50 rises from the fold portion 54. Further, the second floor panel 4 is formed with linear bead portions 56 on both sides along the curved portion 22a of the floor side frame 22 described above. This bead part 56 is No. No. 3 cross member 28 no. 4 extends to the cross member 29.
In the second floor panel 4, four panel regions S 9 to S 12 surrounded by the frame members 20, 22, 28, 29, the folded part 54 and the bead part 56 are formed.

  The third floor panel 6 is No. 4 cross member 29, floor side frame 22 and No. 4 A floor tunnel portion 50 is formed so as to cover the space surrounded by the five cross members 30 and bulges upward so as to extend in the vehicle longitudinal direction at a substantially central position in the vehicle width direction. As for this 3rd floor panel 6, the lower surface of the edge part of the 4 sides is No.2. 4 cross member 29, each floor side frame 22, and No. 4 cross member 29. 5 on each of the left and right sides in the vehicle width direction. The lower surface of the 2 tunnel side member 37 is joined.

In addition, the third floor panel 6 has a No. 3 on both the left and right sides of the floor tunnel portion 50. 4 cross member 29 and no. A bead portion 58 extending linearly in the vehicle width direction is formed in parallel with the five cross member 30. The bead portion 58 is formed by protruding the third floor panel 6 itself upward of the vehicle body.
On the third floor panel 6, four panel regions S13 to S16 surrounded by the frame members 22, 29, 30, 37 and the bead portion 58 are formed.

The fourth floor panel 8 is provided outside the third floor panel 6 in the vehicle width direction. 4 extends in the longitudinal direction of the vehicle body so as to cover the space surrounded by the cross member 29, the side sill 20, the floor side frame 22, and the rear side frame 24. It extends to the vicinity of the 8 cross member 33. These fourth floor panels 8 are joined to the frame members 20, 22, 24, and 29.
The fifth floor panel 10 is No. 5 cross member 30, No. 5 6 The cross member 31, the pair of floor side frames 22 and the pair of rear side frames 24 are provided so as to cover the space, and the lower surfaces of the edges of the four sides are the frame members 22, 24, 30 respectively. , 31.

The sixth floor panel 12 is No. 6 cross member 31, No. 6 7 is provided so as to cover the space surrounded by the cross member 32 and the pair of rear side frames 24, and the lower surfaces of the edge portions of the four sides are joined to the frame members 24, 31, 32, respectively.
The seventh floor panel 14 is No. 7 cross member 32, no. It is provided so as to cover the space surrounded by the eight cross members 33 and the pair of rear side frames 24, and the lower surfaces of the edge portions of the four sides are joined to the frame members 24, 32 and 33, respectively.
The eighth floor panel 16 is No. 8 cross member 33, no. 9 is provided so as to cover the space surrounded by the cross member 34 and the pair of rear side frames 24, and the lower surfaces of the edge portions of the four sides are joined to the frame members 24, 33 and 34, respectively.

  In such an underbody 1 of an automobile, vibrations of the engine 40, the front suspension 44, and the rear suspension 48 are respectively transmitted through a pair of floors via the front suspension cross member 42, the front side frame 18, and the rear suspension cross member 46. Largely transmitted to the side frame 22 and the rear side frame 24, and further transmitted to the cross members 26 to 34, the side sill 20, and the tunnel side members 36 to 38, and these vibrations are transmitted to the first to eighth floor panels 2, 4, 6, 8, 10, 12, 14, 16, resulting in acoustic radiation.

In the embodiment of the present invention, the vibration reduction structure is provided in each of the panel areas S1 to S16 of the first to third floor panels 2, 4, and 6, so that the panel areas S1 to S16 radiate from the vibration transmitted from the frame member. The sound radiation is suppressed. In addition, the 4th thru | or 8th floor panels 8, 10, 12, 14, and 16 are comprised by the conventional panel.
Here, the vibration reduction structure will be described. The vibration reduction structure in the floor panel structure of the vehicle body according to the present embodiment has a predetermined high rigidity portion and a predetermined rigidity in a predetermined region (S1 to S16) of the floor panel surrounded by a frame member or the like. And a low portion (low rigidity portion). The vibration energy of the vibration transmitted to this area is concentrated on the low rigidity part due to the difference in rigidity or weight between the high rigidity part and the low rigidity part, and the large vibration strain caused by this concentrated vibration energy constitutes the floor panel. Vibration is reduced by the damping ability of the material (steel plate) (vibration reducing effect). In particular, in the vibration reduction structure of the present embodiment, the predetermined high rigidity portion and the predetermined low rigidity portion are formed so that the difference in rigidity between the high rigidity portion and the low rigidity portion is increased or the weight difference is also increased. is doing. In this way, the acoustic radiation radiated from each region is reduced by the vibration reducing structure. Furthermore, a damping material is provided in the low-rigidity part so that vibration is greatly reduced.

First, the floor panel structure of the vehicle body of the first embodiment will be specifically described with reference to FIGS. In the first embodiment, the panel regions S2, S10, S13, and S14 are provided with a high-rigidity portion and a low-rigidity portion as a vibration reduction structure, and auxiliary devices such as a CD changer, a navigation unit, a CPU device, various types are provided in the high-rigidity portion. By attaching a power supply, console box, harnesses, air conditioning equipment, etc., the rigidity and weight of the high-rigidity part are increased so that the vibration reduction effect can be obtained more reliably.
FIG. 2 is an enlarged plan view (a) showing the panel region S2 according to the first embodiment of the present invention, and a sectional view (b) showing a sectional structure in the vehicle width direction of the panel region S2 as seen along the line II-II. 3 is an enlarged plan view (a) showing the panel region S10 and a sectional view (b) taken along the line III-III, and FIG. 4 shows the panel region S13. FIG. 5 is an enlarged plan view (a) and a sectional view (b) taken along the line IV-IV, and FIG. 5 is an enlarged plan view (a) showing the panel region S14 and a section taken along the line VV. FIG.

First, the vibration reducing structure provided in the panel region S2 will be described with reference to FIG.
As shown in FIG. 2A, the panel region S2 has a frame member No. 2 as described above. 2 cross member 27, floor side frame 22 and No. 2 One tunnel side member 36 and the bent portion 52 are surrounded. Further, the panel region S2 has the frame members 22, 27, 36 and the bent portion 52 extending linearly, respectively. 2 cross member 27 and bent portion 52, floor side frame 22 and No. 2 One tunnel side member 36 is formed in a rectangular shape extending in parallel with each other. Here, as described above, the bent portion 52 is formed by bending the first floor panel 2 in a straight line, and vibration generated in the adjacent panel region S6 and vibration generated in the panel region S2 are coupled to each other. It plays a role as a vibration restricting part that restricts vibration so as not to occur.

In the panel region S <b> 2, a rectangular high-rigidity part 60 and a low-rigidity part 62 extending in an L shape around the high-rigidity part 60 are formed. In the high rigidity portion 60, each side that becomes the boundary portion a with the low rigidity portion 62 extends in a straight line, and the remaining two sides are No. 2 cross member 27 and No. 2 1 is in contact with the tunnel side member 36. Further, the high-rigidity portion 60 extends almost to the center of the panel region S2.
Here, the width of the low-rigidity portion 62, that is, the distance between the boundary portion a with the high-rigidity portion 60 and the frame member 22 or the bent portion 52 is such that the rigidity of the low-rigidity portion 62 does not increase. It is formed to have a predetermined size.

As shown in FIG. 2B, the high-rigidity portion 60 is formed by projecting the floor panel itself upward of the vehicle body, and its cross-sectional shape is substantially trapezoidal. As shown in FIGS. 2A and 2B, a bracket 64 extending in a square shape is provided in the space formed by protruding the high-rigidity portion 60. Auxiliary machinery 66 is attached to the upper surface.
The bracket 64 is formed in a size adjacent to each side of the high-rigidity portion 60, that is, the boundary portion a with the low-rigidity portion 62. 2 cross member 27 and No. 2 One tunnel side member 36 is fixed. The bracket 64 is provided with a screw hole (not shown) for attaching the auxiliary machinery 66.

Next, as shown in FIG. 2B, the low-rigidity portion 62 is formed almost flat, and a damping material 68 is provided over the entire area. In the plan view of FIG. 2A, the damping material is not shown, and similarly, the damping material 68 is not shown in the plan view. The vibration damping material 68 is provided such that the rigidity of both the vibration damping material 68 and the low rigidity portion 62 is lower than the rigidity of the high rigidity portion 60.
Here, the vibration damping material 68 is an asphalt vibration damping material (product name: damping sheet (Hirotani Co., Ltd.)) having a specific gravity of about 1.7 and a hardness of about 6B in pencil hardness. It is formed in a sheet shape in a shape matching the character-shaped outer shape, and is affixed to the low rigidity portion 62.

Next, the vibration reduction structure provided in the panel region S10 will be described with reference to FIG.
As shown in FIG. 3A, the panel region S10 has a frame member No. 3 cross member 28 and No. 3 The four cross member 29 is surrounded by a bent portion 54 formed at the edge of the floor tunnel portion 50 and a bead portion 56 formed along the curved portion 22 a of the floor side frame 22.
The panel region S10 has the frame members 28 and 29, the bent portions 54, and the bead portions 56 extending in a straight line, respectively. 3 cross member 28 and no. The four cross members 29 are formed in a substantially rectangular shape extending in parallel with each other. In particular, in the present embodiment, a linear bead portion 56 is formed along the curved portion 22a of the floor side frame 22 so as to form such a substantially rectangular region. Here, each of the bent portion 54 and the bead portion 56 serves as a vibration restricting portion that restricts the vibration region of the panel region S10.

  In the panel region S10, a rectangular high-rigidity portion 60 and a low-rigidity portion 62 extending around the high-rigidity portion 60 in a U-shape are formed. The high-rigidity portion 60 has three sides, that is, boundary portions a with the low-rigidity portion 62 extending linearly, and the remaining one side is No. 4 is in contact with the cross member 29. Further, the high-rigidity portion 60 extends to substantially the center of the panel region S10, and the low-rigidity portion 62 is formed to extend with a predetermined width similarly to the above-described panel region S2.

  Here, no. The 4 cross member 29 is relatively lower in connection rigidity of the connection portion 29a with the floor side frame 22 than other cross members. That is, in this embodiment, No. No. 4 cross member 29 and floor side frame 22 may have other joint areas such as The area of the joint between the three cross members 28 and the floor side frame 22 is relatively small. In this way, the engine 40 and the suspensions 44 and 48 are passed through the floor side frame 22 to No. The amount of vibration input to the four cross member 29 is reduced. In addition, it is No. by bolting. The four cross members 29 and the floor side frame 22 may be connected, and the connection rigidity may be made relatively smaller than other cross members.

As shown in FIG. 3B, the high-rigidity portion 60 is formed by projecting the floor panel itself upward of the vehicle body, and its cross-sectional shape is substantially trapezoidal. Further, the low-rigidity portion 62 is formed to be substantially flat, and the damping material 68 is attached to the entire area in the same manner as the panel region S2 described above.
Further, as shown in FIGS. 3A and 3B, a bracket 64 is provided in a space formed by protruding the high-rigidity portion 60, and auxiliary equipment is provided on the upper surface of the high-rigidity portion 60 by the bracket 64. 66 is provided. The bracket 64 is formed in a rectangular shape so as to be adjacent to each side of the high-rigidity portion 60, that is, the boundary portion a with the low-rigidity portion 62. It is fixed to the 4 cross member 29.

  Like the high-rigidity portion 60, the bracket 64 extends to substantially the central portion of the panel region S10, and is approximately in the vicinity of the central portion so that the weight in the vicinity of the central portion is larger than the weight of the other portions. And a portion 64a having an increased plate thickness. A screw hole (not shown) for attaching the auxiliary machinery 66 is formed in the portion 64a where the plate thickness is increased, so that the auxiliary machinery 66 is attached in the vicinity of the center of the panel region. Yes.

Next, the vibration reduction structure provided in the panel region S13 will be described with reference to FIG.
As shown in FIG. 4A, the panel region S13 has a frame member No. 1 as described above. 4 cross member 29, floor side frame 22 and No. 4 Two tunnel side members 37 and a bead portion 58 are surrounded. Further, the panel region S13 has the frame members 22, 29, 37 and the bead portion 58 extending linearly. The four cross member 29 and the bead portion 58 are formed in a substantially rectangular shape extending in parallel with each other. In particular, the floor side frame 22 has a no. 4 cross member 29 and no. 5 is bent at the connecting portions 29a, 30a with the cross member 30 (folded portions 22b, 22c) (see FIG. 1). 4 cross member 29 and no. It is formed so as to extend linearly between the five cross members 30. Here, the bead portion 58 serves as a vibration restricting portion that restricts vibration so that vibration generated in the adjacent panel region S15 and vibration generated in the panel region S13 are not coupled to each other.

  In the panel region S13, a substantially rectangular high-rigidity portion 60 is formed at a substantially central portion so as not to contact the frame members 22, 29, and 37, and a rectangular shape is formed around the high-rigidity portion 60. An extending low rigidity portion 62 is formed. The high-rigidity portion 60 is formed such that, of the boundary portion a with the low-rigidity portion 62, two sides extending in the vehicle body front-rear direction extend linearly and the remaining two sides extending in the vehicle width direction extend in a curved shape. ing. Further, the low-rigidity portion 62 is formed to extend with a predetermined width similarly to the panel region S2 described above.

As shown in FIG. 4 (b), the high-rigidity portion 60 is formed by protruding the floor panel itself above the vehicle body, and its cross-sectional shape is substantially flat at the center, and its periphery extends in the vehicle width direction. The extending two side portions are curved, and the two side portions extending in the front-rear direction of the vehicle body extend linearly in the same manner as the panel region S10 described above. Further, the low-rigidity portion 62 is formed to be substantially flat, and the damping material 68 is attached to the entire area in the same manner as the panel region S2 described above.
As shown in FIGS. 4A and 4B, a rectangular bracket 64 is provided in the space formed by protruding the high-rigidity portion 60, and the auxiliary device is installed on the upper surface of the high-rigidity portion 60 by this bracket 64. A class 66 is attached. The bracket 64 is sized and arranged so as to be adjacent to a boundary portion a having two sides extending on a straight line of the high-rigidity portion 60.

Next, the vibration reduction structure provided in the panel region S14 will be described with reference to FIG.
As shown in FIG. 5A, the panel region S14 has a frame member No. 5 similar to the panel region S13 described above. 4 cross member 29, floor side frame 22 and No. 4 2 The tunnel side member 37 and the bead portion 58 are surrounded by a substantially rectangular shape.

As shown in FIGS. 5A and 5B, in this panel region S14, a bracket 64 is fixed to the lower surface of the substantially central portion so as not to contact the frame members 22, 29, 37 and the bead portion 58. The auxiliary machinery 66 is attached to the upper surface of the floor panel by the bracket 64. The bracket 64 is formed in a rectangular shape whose four sides extend linearly. In the panel region S <b> 14, the bracket 64 and a range where the bracket 64 is fixed is configured as the high-rigidity portion 60.
On the other hand, a substantially flat portion extending in a square shape is formed around the high-rigidity portion 60, and the flat portion is configured as the low-rigidity portion 62. The low-rigidity portion 62 is formed so as to extend with a predetermined width similarly to the panel region S2 described above, and the damping material 68 is attached to the entire area in the same manner as the panel region S2 described above.

  In the panel regions S2, S10, S13, and S14 of the present embodiment, the high-rigidity portion 60 is formed so as to protrude downward, the bracket 64 is provided in the protruding space as described above, and the auxiliary machinery 66 May be attached to the outside of the vehicle below each floor panel. Further, the auxiliary machinery 66 may be directly attached to the bracket 64.

Next, the effect of the floor panel structure of 1st Embodiment is demonstrated.
In the panel regions S2, S10, S13, and S14 of the floor panel structure of the present embodiment, the high rigidity portion 60 and the low rigidity portion 62 formed around the high rigidity portion 60 are provided. Due to the difference in rigidity between the rigid portion 60 and the low-rigidity portion 62, vibration energy is concentrated on the low-rigidity portion 62.
Further, since the auxiliary machinery 66 is attached to the high-rigidity portion 60, the rigidity of the high-rigidity portion 60 is further increased by the auxiliary machinery 66, and a larger rigidity difference is obtained. Further, the auxiliary machinery 66 increases the weight of the high-rigidity portion 60, and a weight difference between the high-rigidity portion 60 and the low-rigidity portion 62 is obtained. Even with such a weight difference, vibration energy can be concentrated on the low rigidity portion 62. Therefore, the vibration energy is concentrated more on the low rigidity portion 62.

  Therefore, the vibration energy is largely concentrated on the low rigidity portion 62, and the vibration energy is converted into heat energy by the damping ability of the steel plate constituting the floor panel, so that the vibration energy of the entire panel region is reduced. As a result, acoustic radiation from the panel area is reduced.

  Furthermore, since the vibration damping material 68 is provided in the low-rigidity part 62, vibration energy concentrated on the low-rigidity part 62 is greatly reduced. In particular, since the vibration damping material 68 is provided such that the rigidity of both the vibration damping material 68 and the low rigidity portion 62 is lower than the rigidity of the high rigidity portion 60, the vibration energy is concentrated on the low rigidity portion 62. The vibration energy can be reduced without hindering.

Next, the function and effect of the arrangement of the high rigidity portion 60 will be described.
First, in the panel regions S2 and S10 of the present embodiment, the high-rigidity portion 60 is formed so as to extend to substantially the center of each panel region, and in the panel regions S13 and S14, the high-rigidity portion 60 includes It is formed almost at the center of the panel area.

  Here, the frame members 22, 27, 28, 29, 36, 37, and the like, the bent portions 52, 54 and the bead portions 56, 58 that are vibration restricting portions have high rigidity and small vibration amplitude itself. In S2, 10, S13, and S14, the vibration amplitude in the portion close to the frame member or the vibration restricting portion does not increase so much, and the vibration amplitude tends to increase as the center portion away from the frame member or the vibration restricting portion approaches. . That is, in the panel region, it can be said that the rigidity is lower at the central portion and the rigidity is higher as the frame member is approached.

In the present embodiment, since the high-rigidity portion 60 is provided or extends to the central portion of each panel region S2, 10, S13, S14, the difference in rigidity between the high-rigidity portion 60 and the low-rigidity portion 62 is greatly increased. It becomes easy to obtain, and the vibration energy can be reliably concentrated by the low rigidity portion 62. Further, by increasing the weight of the substantially central portion of the panel region by the auxiliary machinery 66, the vibration energy can be largely concentrated on the low rigidity portion 62 due to the weight difference. Further, since the low rigidity portion 62 is formed so as to extend with a predetermined width so as not to increase its rigidity, vibration energy can be reliably concentrated on the low rigidity portion 62.
In the panel regions S2 and S10, the high-rigidity portion 60 extends almost to the center, so that vibration energy can be more reliably concentrated on the low-rigidity portions 62 around the two or three sides. .

  Next, in the panel region S2, two sides of the high rigidity portion 60 are in contact with the frame members 27 and 36, and in the panel region S10, one side of the high rigidity portion 60 is in contact with the frame member 29. The rigidity of the part 60 can be greatly increased. Accordingly, the difference in rigidity between the high-rigidity portion 60 and the low-rigidity portion 62 can be increased, and vibration energy can be reliably concentrated by the low-rigidity portion 62. The same effect can be obtained even if the high-rigidity portion 60 is formed so as to be in contact with the bent portions 52 and 54 and the bead portions 56 and 58 that are vibration restricting portions.

  Here, as described above, no. In the 4 cross member 29, the connection rigidity of the connection portion 29a connected to the floor side frame 22 is relatively lower than that of the other cross members, and the vibration transmission amount is small. In the panel area S10, this No. 4 Since the high rigidity portion 60 is in contact with the cross member 29, no. It is possible to prevent the acoustic radiation caused by the vibration directly transmitted from the four cross member 29 to the high-rigidity portion 60 and the vibration transmitted to the low-rigidity portion 62 via the high-rigidity portion 60 from becoming large.

Next, the function and effect of the shape of the high rigidity portion 60 will be described.
First, in the panel regions S2, S10, and S14, the boundary portion a of each side of the high rigidity portion 60 extends linearly, and in the panel region S13, the boundary portion a of two sides of the high rigidity portion 60 linearly extends. Since it extends, the vibration energy is concentrated on the low-rigidity portion 62 including the boundary portion a between the high-rigidity portion 60 and the low-rigidity portion 62 without increasing the rigidity of the portion of the low-rigidity portion 62 adjacent to those sides. I can do it.
Here, the ranges where vibration energy is particularly concentrated are indicated by E in FIGS. 2 (a), 3 (a), 4 (a), and 5 (a). As indicated by E in each figure, the vibration energy tends to concentrate in a range near the high-rigidity portion 60 in the low-rigidity portion 62, and particularly in the vicinity of the side extending on the straight line of the high-rigidity portion 60. The vibration energy is particularly concentrated in a range including the boundary portion a between the portion 60 and the low rigidity portion 62.

On the other hand, for example, if the high-rigidity portion is formed in a circular shape or an elliptical shape so that the boundary portion between the high-rigidity portion and the low-rigidity portion extends in a curved shape, the rigidity can be further increased as compared to the rectangular shape. I can do it. In the present embodiment, since the two sides of the high-rigidity portion 60 are formed in a curved shape in the panel region S13, the rigidity of the high-rigidity portion 60 can be further increased by the two curved sides. That is,
Here, as indicated by E in FIG. 4, the rigidity of the low-rigidity portion 62 adjacent to the curved boundary portion a is increased, and a portion where vibration energy is less likely to concentrate is generated as indicated by X in the drawing. . On the other hand, in the panel region S13 of the present embodiment, the remaining two sides are formed in a straight line so as not to narrow the range E in the figure where the vibration energy is concentrated.

  Further, if the high-rigidity portion 60 is formed so that its two sides extend in a curved shape, the damping material 68 can be easily positioned on the low-rigidity portion 62. That is, if the damping material 68 is formed in advance in accordance with the shape of the boundary portion a with the high-rigidity portion 60 and attached to the low-rigidity portion 62, positioning in the front-rear direction and the vehicle width direction is facilitated. Moreover, the press molding accuracy of the high-rigidity portion 60 can be increased.

Next, the effect of the bracket 64 for attaching the auxiliary machinery 66 will be described.
First, in the panel regions S2, S10, and S13, the bracket 64 is provided in a space formed by protruding the high-rigidity portion 60. Therefore, the bracket 64 can be prevented from coming into contact with the low-rigidity portion 62 and the rigidity of the low-rigidity portion 62 can be prevented from increasing, and the high-rigidity portion 60 is supported so as to stretch in the space by the rigidity of the bracket 64 itself. Therefore, the rigidity of the high rigidity portion 60 can be increased. Furthermore, since the weight difference between the high-rigidity portion 60 and the low-rigidity portion 62 is obtained by the weight of the bracket 64 itself, vibration energy can be more effectively concentrated on the low-rigidity portion 62.
Furthermore, since the bracket 64 extends so as to be adjacent to the boundary portion a formed by the high-rigidity portion 60 and the low-rigidity portion 62, the rigidity of the high-rigidity portion 60 can be reliably increased, and the boundary portion a. The rigidity of the high rigidity part 60 in the vicinity can be greatly increased, and the difference in rigidity between the high rigidity part 60 and the low rigidity part 62 can be further increased.

In the panel regions S2 and S10, since the bracket 64 is attached to the frame member with which the high-rigidity portion 60 contacts, the strength of the bracket 64 can be ensured without increasing the rigidity of the low-rigidity portion 62. .
Further, in the panel region S10, the bracket 64 extends to substantially the center of the panel region, and the auxiliary machinery 66 is attached to the substantially center of the panel region. Therefore, the rigidity of the high-rigidity portion 60 and the low-rigidity portion 62 is increased. The difference and the weight difference can be further increased, and the vibration energy can be largely concentrated on the low rigidity portion 62. Furthermore, since the bracket 64 has a portion 64a whose thickness is increased so that the weight in the vicinity of the substantially central portion of the panel region is larger than the weight of the other portions, vibration energy is applied to the low-rigidity portion 62. You can concentrate more. Further, the bracket 64 has a relatively small vibration transmission amount as described above. Since the four cross members 29 are attached, it is possible to prevent acoustic radiation due to vibration transmitted to the panel region S10 through the bracket 64 from becoming large.

  Next, in the panel region S14, since the bracket 64 and the panel portion to which the bracket 64 is fixed are configured as the high-rigidity portion 60, the high-rigidity portion 60 can be provided without press-molding the panel region. Further, since the flat portion around the high-rigidity portion 60 is configured as the low-rigidity portion 62, vibration energy is applied to the low-rigidity portion 62 as described above due to the difference in rigidity between the high-rigidity portion 60 and the low-rigidity portion 62. Can be concentrated.

  In addition, when the bracket 64 is provided in the protruding space of the high-rigidity portion 60 formed so as to protrude downward, and the auxiliary machinery 66 is attached to the outside of the vehicle below each floor panel, or the auxiliary machinery 66 is Even when directly attached to the bracket 64, the above-described effects can be obtained in the same manner.

Next, the function and effect of the frame member and the vibration restricting portion that form each panel region will be described.
In this embodiment, the frame members 22, 27 to 30, 36, and 37, and the portions that form the panel regions S 2, S 10, S 13, and S 14 of the bent portions 52 and 54 and the bead portions 56 and 58 that are vibration regulating portions are straight lines. Therefore, the rigidity of the low-rigidity part 62 can be prevented from increasing, and the difference in rigidity between the high-rigidity part 60 and the low-rigidity part 62 can be obtained more reliably. That is, when the frame members 22, 27 to 30, 36, and 37, and the bent portions 52 and 54 and the bead portions 56 and 58, which are vibration restricting portions, are formed in a curved shape, the rigidity in the vicinity thereof increases. Since the vibration energy is less likely to concentrate on the low-rigidity portion 62, this is prevented.

  In particular, in the panel region S10, a linear bead portion 56 that is a vibration restricting portion is formed along the curved portion 22a of the floor side frame 22, and in the panel regions S13 and S14, the floor side frame 22 is No. . No. 4 connecting portion 29a and No. 4 cross member 29. The portions forming the regions S13 and S14 are bent at the connecting portions 30a with the five cross members 30 so as to be linear.

  Further, the panel region S2 is formed in a rectangular shape, and the panel regions S10, S13, and S14 are formed in a substantially rectangular shape in which two sides are parallel to each other. It can be prevented from becoming smaller.

  As shown in FIG. 6A, in the panel region S10, the bead portion 56 may be formed so as to be parallel to the bent portion 54 formed at the edge of the floor tunnel portion 50. As shown in FIG. 6B, the edge 22e of the flange 22d of the floor side frame 22 is formed so as to be linear over the portion in contact with the region S10, and the vibration region of the panel region S10 is formed by the edge 22e. You may make it regulate. Even in these cases, the above-described effects can be obtained.

Next, the floor panel structure of the vehicle body of the second embodiment will be specifically described with reference to FIGS. 1 and 7 to 11. In the second embodiment, the panel regions S1 and S5, S3 and S7, S4 and S8, S6, S11, S15, and S16 are each provided with a high-rigidity portion and a low-rigidity portion as a vibration reducing structure, and the high-rigidity portion is used as a frame member. It is formed so as to be in contact with each other to increase its rigidity so that the vibration reduction effect can be obtained more reliably.
FIG. 7 shows an enlarged plan view (a) showing the panel regions S1 and S5 according to the second embodiment of the present invention and a cross-sectional structure of the panel regions S1 and S5 in the longitudinal direction of the vehicle body as viewed along the line VII-VII. FIG. 8 is a sectional view (b). Similarly, FIG. 8 is an enlarged plan view (a) showing the panel regions S3 and S7 and a sectional view (b) taken along the line VIII-VIII, and FIG. FIG. 10 is an enlarged plan view (a) showing the panel regions S4 and S8 and a sectional view (b) taken along the line IX-IX. FIG. 10 is an enlarged plan view (a) showing the panel region S11 and It is sectional drawing (b) seen along XX line, FIG. 11: is the expanded plan view (a) which shows panel area | region S15, and sectional drawing (b) seen along the XI-XI line.

First, the vibration reduction structure provided in the panel regions S1 and S5 will be described with reference to FIG.
As shown in FIG. 7A, the panel regions S1 and S5 share the folded portion 52. As described above, the panel region S1 includes the folded portion 52 and the frame member No. 2 is formed by being surrounded by the cross member 27, the side sill 20, and the floor side frame 22, and as described above, the panel region S5 includes the bent portion 52, the side sill 20, which is a frame member, the floor side frame 22, and the No. 2 frame. It is formed surrounded by three cross members 28. In addition, these panel regions S1, S5 have their respective frame members 20, 22, 27, 28 and the bent portion 52 extending linearly, respectively. 2 cross member 27 and bent portion 52, this bent portion 52 and No. 2 The three cross members 28 and the side sill 20 and the floor side frame 22 are respectively formed in a rectangular shape extending in parallel with each other. Here, as described above, the bent portion 52 plays a role as a vibration restricting portion.

In these panel regions S1 and S5, a substantially rectangular high-rigidity portion 70 is formed over each region S1 and S5, and the four sides of the high-rigidity portion 70, that is, the boundary portion a with the low-rigidity portion 62 described later, Each of them is formed in a substantially linear shape extending in a slightly curved shape. The high-rigidity portion 70 is disposed at a position adjacent to the side sill 20 that is an end portion of the folding portion 52 in the vehicle width direction, and is in contact with the folding portion at substantially the middle portion of one side in the vehicle width direction. The side sill 20 is in contact with substantially the middle portion of the opposite side in the vehicle width direction. Note that the side sill 20 may be in contact with all of its one side.
The high-rigidity portion 70 is formed with a plurality of reinforcing beads 73 extending in the vehicle front-rear direction from the vehicle-front side of the high-rigidity portion 70 to the vehicle-side rear side so as to cover the two panel regions S1 and S5. ing.

  As shown in FIG. 7 (b), the high-rigidity portion 70 is formed by projecting the floor panel itself upward from the vehicle body so as to be sandwiched between the panel regions S1 and S5 extending in a U-shape, and its cross-sectional shape is It has a dome shape whose curved surface height changes continuously.

  Next, as shown in FIGS. 7A and 7B, in the panel region S1, a circular high-rigidity portion 74 is formed at substantially the center so as not to contact each frame member and the bent portion. Yes. The high-rigidity portion 74 is formed by protruding the floor panel itself above the vehicle body, and the cross-sectional shape thereof is a dome shape whose curved surface height continuously changes.

  Further, in the panel region S5, a rectangular high-rigidity portion 76 having four straight sides formed in a straight line is formed. 3 is in contact with the cross member 28. The high-rigidity portion 76 is formed by protruding the floor panel itself above the vehicle body, and the cross-sectional shape thereof is a trapezoidal shape whose upper surface extends substantially horizontally. A seat leg portion (not shown) is attached to the horizontally extending upper surface of the high-rigidity portion 76.

On the other hand, the panel regions S1 and S5 are each formed with a substantially flat low-rigidity portion 62 extending around these high-rigidity portions 70, 74, and 76, and the first embodiment described above is formed over the entire area. The damping material 68 is affixed similarly to the panel region S2.
In the panel region S 1, these low-rigidity portions 62 are a portion extending in an L shape around the high-rigidity portion 70 that is in contact with the bent portion 52, and a portion extending in a round shape around the circular high-rigidity portion 74. In the panel region S5, a portion extending in an L shape around the high-rigidity portion 70 in contact with the bent portion 52 and a portion extending in an L-shape around the rectangular high-rigidity portion 76 It extends in the shape of a letter T. Further, like the panel region S2 of the first embodiment described above, these low-rigidity parts 62 are formed so that the width thereof is a predetermined size so that the rigidity of the low-rigidity part 62 does not increase. .

Next, the vibration reduction structure provided in the panel regions S3 and S7 will be described with reference to FIG.
As shown in FIG. 8A, the panel regions S3 and S7 share the folded portion 52. As described above, the panel region S3 includes the folded portion 52 and the frame member No. 2 cross member 27, floor side frame 22 and No. 2 The panel region S7 is formed by being surrounded by the tunnel side member 36. As described above, the panel region S7 includes the folded portion 52, the floor side frame 22 which is a frame member, and a No. 1 frame side member. 1 tunnel side member 36 and No. 1 It is formed surrounded by three cross members 28. In addition, these panel regions S3 and S7 have their respective frame members 22, 27, 28, and 36 and the bent portion 52 extending linearly, respectively. 2 cross member 27 and bent portion 52, this bent portion 52 and No. 2 No. 3 cross member 28 and floor side frame 22 One tunnel side member 36 is formed in a rectangular shape extending in parallel with each other. Here, as described above, the bent portion 52 plays a role as a vibration restricting portion.

  In these panel regions S3 and S7, a substantially rectangular high-rigidity portion 70 is formed that extends in the vehicle body longitudinal direction across the two regions S3 and S7 and over almost the entire region of the panel region S3 in the vehicle body longitudinal direction. The boundary portion a between the high-rigidity portion 70 and the low-rigidity portion 62 described later has two sides facing each other in the vehicle width direction extending linearly in the vehicle longitudinal direction, and each end in the vehicle longitudinal direction is arcuate. It extends to. The high-rigidity portion 70 is disposed at a substantially intermediate portion in the vehicle width direction of the folding portion 52, and two sides extending in the vehicle body front-rear direction are in contact with the folding portion. Further, the high-rigidity portion 70 is formed with a plurality of reinforcing beads 73 extending in the vehicle width direction so as to cover the low-rigidity portions 62 on the left and right sides described later.

As shown in FIG. 8 (b), the high-rigidity portion 70 is formed by projecting the floor panel itself upward of the vehicle body so as to be sandwiched between the panel regions S3 and S7 extending in a U-shape, and its cross-sectional shape is It has a dome shape whose curved surface height changes continuously.
Next, as shown in FIGS. 8 (a) and 8 (b), the panel region S7 has an end portion of No. 1 in the middle of the vehicle width direction. A high-rigidity portion 78 that is in contact with the three cross member 28 and extends to substantially the center of the region S7 is formed. In the boundary portion a between the high-rigidity portion 78 and the low-rigidity portion 62, two sides facing each other in the vehicle width direction extend linearly in the vehicle longitudinal direction, and each end in the vehicle longitudinal direction extends in an arc shape. ing. The high-rigidity portion 78 is formed by projecting the floor panel itself upward of the vehicle body, and its cross-sectional shape is a dome shape whose curved surface height continuously changes.

On the other hand, the panel regions S3 and S7 are respectively formed with substantially flat and low-rigidity portions 62 extending around these high-rigidity portions 70 and 78, and the panel of the first embodiment described above is formed over the entire area. The damping material 68 is affixed similarly to area | region S2.
These low-rigidity portions 62 extend in a shape including straight portions on both the left and right sides in the vehicle width direction of the high-rigidity portion 70 in contact with the bent portion 52 in the panel region S3, and are bent in the panel region S7. A portion extending in a U shape around the highly rigid portion 70 in contact with the portion 52; 3 extends in an H shape including a portion extending in a U shape around the highly rigid portion 78 in contact with the cross member 28. Further, these low-rigidity parts 62 are formed to extend with a predetermined width in the same manner as the panel region S2 of the first embodiment described above.

  Next, as shown in FIG. 1, the panel region S6 is formed in a rectangular shape as in the panel region S7 (see FIG. 8). In the panel region S6, a high-rigidity portion 79 similar to the rectangular high-rigidity portion 76 provided in the panel region S5 described above is No. 3 cross member 28 and No. 3 One tunnel side member 36 is formed so that all of its two sides are in contact with each other, and a flat low-rigidity portion 62 extending in an L shape is formed around the two sides. In addition, the low-rigidity portion extends with a predetermined width and a damping material 68 is attached to the entire area, as in the panel region S2 of the first embodiment.

Next, the vibration reduction structure provided in the panel regions S4 and S8 will be described with reference to FIG.
As shown in FIG. 9A, the panel regions S4 and S8 are formed in the same manner as the above-described panel regions S1 and S5, and share the folding portion 52 that is a vibration restricting portion, and each of the panel regions S4 and S8 includes The frame members 20, 22, 27, 28 and the bent portion 52 are surrounded by a rectangular shape.

  In these panel regions S4 and S8, a substantially rectangular high-rigidity portion 70 is formed over the regions S4 and S8, and the boundary portions a with the four sides of the high-rigidity portion 70, that is, the low-rigidity portion 62 are slightly different. It is formed in a substantially straight line extending in a curved line shape. The high-rigidity portion 70 is disposed at a substantially intermediate portion in the vehicle width direction of the folding portion 52, and part of two sides extending in the vehicle body front-rear direction is in contact with the folding portion 52. Furthermore, a plurality of reinforcing beads 73 extending in the longitudinal direction of the vehicle body from the side on the vehicle body front side of the high rigidity portion 70 to the side on the vehicle body rear side are formed in the high rigidity portion 70 so as to cover the two panel regions S4 and S8. ing.

  As shown in FIG. 9 (b), the high-rigidity portion 70 is formed by projecting the floor panel itself upward of the vehicle body so as to be sandwiched between the panel regions S4 and S8 extending in a U-shape, and its cross-sectional shape is It has a dome shape whose curved surface height changes continuously.

  Next, as shown in FIGS. 9A and 9B, the panel region S4 has a circular high rigidity so as not to contact the frame members 20, 22, 27 and the bent portion 52 at the substantially central portion thereof. A portion 74 is formed. The high-rigidity portion 74 is formed by protruding the floor panel itself above the vehicle body, and the cross-sectional shape thereof is a dome shape whose curved surface height continuously changes.

  Further, the panel region S8 is formed with a rectangular high-rigidity portion 76 in which each of the four sides is linearly formed. 3 is in contact with the cross member 28. The high-rigidity portion 76 is formed so that the floor panel itself protrudes above the vehicle body, and the cross-sectional shape thereof is a substantially trapezoidal shape whose upper surface extends substantially horizontally. A seat leg portion (not shown) is attached to the horizontally extending upper surface of the high-rigidity portion 70.

On the other hand, in the panel regions S4 and S8, the low rigidity portion 62 formed substantially flat and extending around the high rigidity portions 70, 74 and 76 is formed, respectively, and the first embodiment described above is formed in the entire area. The damping material 68 is affixed similarly to the panel area | region S2 of a form.
In the panel region S4, these low-rigidity portions 62 are a portion extending in a U shape around the high-rigidity portion 70 in contact with the bent portion 52 and a portion extending in a square shape around the circular high-rigidity portion 74. In the panel region S8, a portion extending in a U shape around the high-rigidity portion 70 in contact with the bent portion 52 and a U-shape extending around the rectangular high-rigidity portion 76 Extending in an H shape including a portion. Further, these low-rigidity parts 62 are formed to extend with a predetermined width in the same manner as the panel region S2 of the first embodiment described above.

Next, the vibration reduction structure provided in the panel region S11 will be described with reference to FIG.
As shown in FIG. 10A, the panel region S11 is formed in the same manner as the panel region S10 (see FIG. 3) of the first embodiment described above, and the frame member No. 3 cross member 28 and No. 3 Surrounded by the four cross members 29, the linearly bent portion 54 formed at the edge of the floor tunnel portion 50, and the linear bead portion 56 formed along the curved portion 22 a of the floor side frame 22. It is formed in a substantially rectangular shape. Both the bent portion 54 and the bead portion 56 serve as a vibration restricting portion that restricts the vibration region of the panel region S11.

In the panel region S11, a substantially rectangular high-rigidity portion 70 and a low-rigidity portion 62 extending in an L shape around the high-rigidity portion 70 are formed. The low-rigidity portion 62 is formed in the first embodiment described above. Like the panel region S2 of the form, it extends with a predetermined width. The high-rigidity portion 70 is formed in a substantially linear shape with each side extending in a slightly curved shape. Further, the high-rigidity portion 70 has a substantially middle portion on one side in the vehicle width direction in contact with the bent portion 54 and a substantially middle portion on one side on the rear side of the vehicle body. 4 is in contact with the cross member 29 and extends almost to the center of the panel region S10. Here, no. As described above, the 4-cross member 29 has a small amount of vibration transmission.
In addition, the high rigidity portion 70 is in contact with the high rigidity portion 70. A plurality of reinforcing beads 73 extending radially from the side of the four cross member 29 and the bent part 54 toward the side of the low rigidity part 62 are formed.

As shown in FIG. 10B, the high-rigidity portion 70 is formed by protruding the floor panel itself downward from the vehicle body, and its cross-sectional shape is a dome shape whose curved surface height continuously changes. In addition, you may form each high-rigidity part 70 so that it may protrude above a vehicle body.
On the other hand, the low-rigidity portion 62 is formed almost flat, and the damping material 68 is attached to the entire area in the same manner as the panel region S2 of the first embodiment described above.

Next, the vibration reduction structure provided in the panel regions S15 and S16 will be described with reference to FIGS. Since the configuration and shape of the panel regions S15 and S16 and the basic shape and arrangement of the vibration reduction structure are the same, the panel region S15 will be mainly described.
As shown in FIGS. 1 and 11 (a), the panel region S15 (S16) has a floor side frame 22, which is a frame member, as described above. 2 tunnel side member 37 and No. 2 The five cross members 30 and the bead portion 58 are surrounded. Further, in the panel region S15, each of the frame members 22, 30, 37 and the bead portion 58 extend linearly, and the bead portion 58 and the No. 3 The five cross members 30 are formed in a substantially rectangular shape extending in parallel with each other. In particular, as in the panel regions S13 and S14, the floor side frame 22 is set to No. 4 cross member 29 and no. It is formed so as to be bent at the connecting portions 29a and 30a with the five cross member 30, and the portion forming this region S15 (S16) extends linearly. Here, as described above in the panel region S13 of the first embodiment, the bead portion 58 serves as a vibration restricting portion.

  In the panel region S15 (S16), a substantially rectangular high-rigidity portion 70 and a low-rigidity portion 62 extending in a U shape around the high-rigidity portion 70 are formed. The high-rigidity portion 70 is formed in a curved shape in which two sides extending in the vehicle width direction bulge outward in the longitudinal direction of the vehicle body and the curvature is continuous. 5 is in contact with the cross member 30. Further, the two sides extending in the longitudinal direction of the vehicle body extend in a substantially straight line extending slightly in a curved line. Further, the low-rigidity portion 62 is formed to extend with a predetermined width similarly to the panel region S2 of the first embodiment described above.

  In addition, the high rigidity portion 70 is in contact with the high rigidity portion 70. A plurality of reinforcing beads 73 extending from the cross member 30 side toward the low rigidity portion 62 side are formed. Specifically, the reinforcing beads 73 formed in the panel region S15 are No. 5 extends in the longitudinal direction of the vehicle body from the side in contact with the cross member 30 to the opposite side of the low-rigidity part 62. As shown in FIG. Reinforcing beads 73 extending radially from the intermediate portion in contact with the five cross members 30 toward the remaining three sides on the low-rigidity portion 62 side are formed.

  Here, no. The 5 cross member 30 has the above-described No. 5 cross member. As with the four cross member 29, the connection rigidity of the connecting portion 30a with the floor side frame 22 is relatively lower than that of the other cross members, and the engine 40 and the suspensions 44 and 48 are passed through the floor side frame 22. No. The amount of vibration input to the five cross member 30 is reduced. The cross-sectional dimension is No. 3 and no. 4 Cross members 28 and 29 are made smaller. The vibration transmission amount of the 5 cross member 30 itself is also reduced.

  As shown in FIG. 11B, the high-rigidity portion 70 is formed by protruding the floor panel itself downward from the vehicle body, and the cross-sectional shape thereof is a dome shape whose curved surface height continuously changes. The high-rigidity portion 70 may be formed so as to protrude upward from the vehicle body. On the other hand, the low-rigidity portion 62 is formed almost flat, and the damping material 68 is attached to the entire area in the same manner as the panel region S2 of the first embodiment described above.

Next, the effect of the floor panel structure of 2nd Embodiment is demonstrated.
In the panel regions S1, S3 to S8, S11, S15, and S16 of the floor panel structure of the present embodiment, the high rigidity portion 70 and the low rigidity formed around the high rigidity portion 70 are the same as in the first embodiment. Due to the difference in rigidity from the rigid portion 62, vibration energy is concentrated on the low-rigid portion 62.

  Furthermore, part or all of the high-rigidity portion 70 is formed so as to be in contact with the frame members 20, 22, 27 to 30, 36, 37 and / or the bent portions 52, 52 that are vibration regulating portions. Therefore, the rigidity of the high rigidity portion 70 can be greatly increased. Therefore, for example, even when the area of the panel region is relatively small and the rigidity of the panel region itself is relatively high, the high-rigidity portion 70 is replaced with the frame members 20, 22, 27 to 30, 36, 37 and the vibration regulating portion 52. , 54, 56, and 58, the rigidity of the high-rigidity portion 70 can be greatly increased, the difference in rigidity from the low-rigidity portion 62 can be increased, and vibration energy can be increased in the low-rigidity portion 62. You can concentrate.

  Therefore, the vibration energy is largely concentrated on the low rigidity portion 62, and the vibration energy is converted into heat energy by the damping ability of the steel plate constituting the floor panel, so that the vibration energy of the entire panel region is reduced. As a result, acoustic radiation from the panel area is reduced.

  Further, as in the first embodiment, a vibration damping material 68 is provided in the low rigidity portion 62, and further provided so that the rigidity of both the vibration damping material 68 and the low rigidity portion 62 is lower than the rigidity of the high rigidity portion 70. Therefore, vibration energy concentrated on the low-rigidity portion 62 can be greatly reduced.

Next, the operation and effect of the arrangement of the high-rigidity portion 70 and the low-rigidity portion 62 provided around the high-rigidity portion 70 will be described.
First, the operational effects of the panel areas S1 and S5, S3 and S7, S4 and S8 will be described.
The panel regions S1 and S5, S3 and S7, S4 and S8 of this embodiment share a highly rigid fold 52 formed by bending in a straight line, and the high rigidity portion 70 is in contact with the fold 52. In addition, since it is formed over these two regions, the rigidity of the high-rigidity portion 70 can be greatly increased, and the difference in rigidity from the low-rigidity portion 62 can be increased. In particular, the high-rigidity portion 70 is formed so as to protrude above the vehicle body so as to be sandwiched between the panel regions S1 and S5, S3 and S7, S4 and S8 extending in the shape of a dogleg. Can be greatly increased.

  Further, the high-rigidity portion 70 has one side in contact with the bent portion 52 and the other side in contact with the side sill 20 in the panel regions S1 and S5, and two sides in the panel regions S3 and S7, S4 and S8, respectively. Since it is in contact with the bent portion 52, its rigidity can be increased more reliably, and the difference in rigidity from the low rigidity portion 62 can be increased more reliably.

  Further, in the panel regions S1 and S5, the high rigidity portion 70 is formed in a substantially rectangular shape and disposed at the end of the common folded portion 52, so that the low rigidity portion of the panel regions S1 and S5 is provided. In 62, portions extending in an L shape around the high-rigidity portion 70 are respectively formed, and vibration energy can be concentrated particularly greatly in a range indicated by E1 in FIG.

  In the panel regions S3 and S7, the high-rigidity portion 70 extends in the vehicle body front-rear direction across the two regions S3, S7 and is disposed at substantially the middle portion of the common folded portion 52. The vehicle body extends in the longitudinal direction over almost the entire direction. Accordingly, the low-rigidity portion 62 is formed with portions that extend linearly on both sides of the high-rigidity portion 70 in the panel region S3, and a U-shape around the end of the high-rigidity portion 70 in the panel region S7. A portion extending in a shape is formed, and vibration energy can be particularly concentrated in a range as indicated by E1 in FIG.

In the panel regions S4 and S8, the high-rigidity portion 70 is formed in a substantially rectangular shape and is disposed at substantially the middle portion of the common folded portion 52. Therefore, in each of the panel regions S4 and S8, a low The rigid portion is formed with a U-shaped portion around the high-rigidity portion 70, and vibration energy can be particularly concentrated in a range as indicated by E1 in FIG.
In these panel regions S1 and S4, S3 and S7, S4 and S8, the L-shaped, U-shaped or linear portions of the low-rigidity portion 62 extend with a predetermined width so that the rigidity does not increase. Therefore, the vibration energy can be more reliably concentrated in the range indicated by E1 described above.

Next, in the panel regions S1 and S5, a circular high-rigidity portion 74 and a rectangular high-rigidity portion 76 are further formed. Due to this portion, the vibration energy can be concentrated particularly in a range as indicated by E2 in FIG.
Further, in the panel region S7, a high-rigidity portion 76 is further formed. Due to the U-shaped portion of the low-rigidity portion 62 extending around the panel region S7, vibration energy is particularly concentrated in a range indicated by E2 in FIG. It can be made.
Further, in the panel regions S4 and S8, a circular high-rigidity portion 74 and a rectangular high-rigidity portion 76 are further formed, and the low-rigidity portion 62 extending around these extends in a square shape or a U-shape. Due to this portion, the vibration energy can be concentrated particularly in a range as indicated by E2 in FIG.

Next, the function and effect of the panel areas S6 and S11 will be described.
In the panel region S6 of the present embodiment, all of the two sides of the rectangular high-rigidity portion 76 are No. 3 cross member 28 and No. 3 1 in contact with the tunnel side member 36, and in the panel region S11, one side of the substantially rectangular high-rigidity portion 70 is in contact with the bent portion 54, and the other side is No. 1. Since the four cross members 29 are in contact with each other, the rigidity of the high-rigidity portion 70 can be greatly increased and the difference in rigidity from the low-rigidity portion 62 can be increased.

Further, in the panel regions S6 and S11, the high-rigidity portion 70 is formed in a substantially rectangular shape, and two adjacent sides thereof are arranged so as to be in contact with the frame members 28, 29, and 36 or the folding portion 54 that is a vibration regulating portion, respectively. Therefore, in each of the regions S6 and S11, the low-rigidity portion 62 is formed with an L-shaped portion around the high-rigidity portion 70, and vibration energy is applied to the range indicated by E in FIG. It can be particularly concentrated. Further, like the panel regions S1 and S5, etc., these L-shaped portions extend with a predetermined width, so that vibration energy can be more reliably concentrated in the range indicated by E described above. .
Further, in the panel region S11, the high-rigidity portion 70 is formed so as to extend to almost the center of the region S11. Therefore, as described in the first embodiment, the high-rigidity portion 70 and the low-rigidity around it. The difference in rigidity with the portion 62 can be further increased. Moreover, it becomes easy to form the L-shaped part of the low-rigidity part 62 around it, and the range where vibration energy concentrates can be obtained more reliably.

  Here, as described above, no. The connection rigidity of the connection part 29a with the floor side frame 22 of the 4 cross member 29 is made relatively lower than the other cross members, and the bent part 54 provided at the edge of the floor tunnel part 50 is as rigid as the frame member. Is not increased, the amount of vibration transmission is relatively small. In the panel region S11 of this embodiment, these No. Since the high-rigidity portion 70 is in contact with the four cross member 29 and the bent portion 54, it is possible to prevent a large vibration from being transmitted to the high-rigidity portion 70. As a result, it is possible to prevent the acoustic radiation caused by the vibration directly transmitted from the frame member to the high-rigidity portion 70 and the vibration transmitted to the low-rigidity portion 62 via the high-rigidity portion 70 from increasing.

Next, the function and effect of the panel areas S15 and S16 will be described.
In the panel regions S15 and S16 of this embodiment, one side of the high-rigidity portion 70 is No. 5 Since it is in contact with the cross member 30, the rigidity of the high-rigidity portion 70 can be greatly increased, and the rigidity difference from the low-rigidity portion 62 can be increased.

  Further, since the high-rigidity portion 70 is formed in a substantially rectangular shape and is disposed at a substantially intermediate portion in the vehicle width direction of each of the regions S15 and S16, the low-rigidity portion 62 of the panel regions S15 and S16 is provided with this high-rigidity portion 62. A portion extending in a U-shape is formed around the rigid portion 70, and vibration energy can be concentrated particularly greatly in a range indicated by E in FIG. In addition, these U-shaped extending portions are formed to extend with a predetermined width so as not to increase the rigidity thereof, so that vibration energy can be more reliably concentrated in the range indicated by E described above. I can do it.

  In the panel regions S15 and S16, the high-rigidity portion 70 is formed so as to extend almost to the center of the regions S15 and S16. Therefore, as described in the first embodiment, the panel region having relatively low rigidity. The high-rigidity portion 70 extends almost to the center of the portion, and the rigidity difference between the high-rigidity portion 70 and the surrounding low-rigidity portion 62 can be further increased. In particular, vibration energy can be more reliably concentrated on the U-shaped low-rigidity portion 62 extending around the three sides of the high-rigidity portion 70.

  Here, as described above, no. The cross member 30 has a lower connection rigidity of the connection portion 30a with the floor side frame 22 than the other cross members and has a cross-sectional dimension of No. 5 cross member 30. 3 and no. It is made smaller than the four cross members 28 and 29 so that the amount of vibration transmission is reduced. In the panel regions S15 and S16 of this embodiment, this No. Since the high-rigidity portion 70 is in contact with the 5 cross member 30, large vibrations can be prevented from being transmitted to the high-rigidity portion 70. As a result, it is possible to prevent the acoustic radiation caused by the vibration directly transmitted from the frame member 30 to the high-rigidity portion 70 and the vibration transmitted to the low-rigidity portion 62 via the high-rigidity portion 70 from increasing.

Next, the function and effect of the shape of the high rigidity portion 70 will be described.
First, the high-rigidity portion 70 provided over the panel regions S1 and S5 or S4 and S8, or the high-rigidity portion 70 provided in the panel region S11 is a low-rigidity portion 62 extending around the periphery thereof. Since the boundary portion a is substantially linear, the rigidity of the low-rigidity portion 62 is not increased, and the range of E where vibration energy is particularly concentrated can be prevented from being significantly narrowed. As a result, the vibration reduction effect can be surely exhibited.

  Further, in the panel regions S3 and S7, the high-rigidity portion 70 is formed so that two sides facing each other in the vehicle width direction extend linearly, so that it is linearly formed on both sides of the high-rigidity portion 70. In a range E including the boundary portion a with the extending portion of the low-rigidity portion 62, vibration energy can be particularly concentrated. Similarly, in the panel region S6, since the boundary portion a extends linearly, vibration energy can be particularly concentrated in a range E including the boundary portion a between the high-rigidity portion 70 and the low-rigidity portion 62. .

  In the panel regions S15 and S16, the two sides extending in the vehicle width direction are each formed in a curved shape, so that the rigidity of the high-rigidity portion 70 can be increased. On the other hand, since the remaining two sides are formed so as to extend linearly, the rigidity of the low-rigidity portion 62 is not increased, and the range of E in which the vibration energy is concentrated can be prevented from becoming too narrow. As a result, the vibration reduction effect can be surely exhibited.

  The high-rigidity portion 70 has a No. 5 is formed in a curved shape so as to contact the cross member 30. A gap as indicated by G in FIG. 11 is formed between the five cross members 30. Of the portions of the low-rigidity portion 62 formed around the two straight sides extending in the longitudinal direction of the vehicle body due to the gap G, No. It is possible to prevent the rigidity of the portion indicated by X in FIG. As a result, the range of E in the figure where the vibration energy is concentrated is not so narrowed, and the vibration reduction effect can be surely exhibited.

  Further, by forming the two sides of the high-rigidity portion 70 so as to extend in a curved shape, the damping material 68 can be easily positioned on the low-rigidity portion 62 including the boundary portion a as described above in the first embodiment. Furthermore, the press molding accuracy of the high-rigidity portion 70 can be increased.

Next, the effect of the shape of the frame member and the vibration restricting portion forming each panel region will be described.
In the present embodiment, in the panel regions S1, S3 to S8, S11, S15, and S16, the frame members 20, 22, 27 to 30, 36, and 37, the bent portions 52 and 54 that are vibration regulating portions, and the bead portion 56, Since the portion that forms the panel region 58 extends linearly, the rigidity of the low-rigidity portion 62 is prevented from increasing, and the difference in rigidity between the high-rigidity portion 70 and the low-rigidity portion 62 can be obtained more reliably. Can be made. Further, the panel areas S1, S3 to S8 are formed in a rectangular shape, and the panel areas S11, S15, and S16 are formed in a substantially rectangular shape having two parallel sides, so that the overall rigidity of each panel area is increased. It is possible to prevent the vibration reduction effect from being reduced.

  In particular, in the panel region S11, as in the panel region S10 described above, a linear bead portion 56 that is a vibration restricting portion is formed along the curved portion 22a of the floor side frame 22, and in the panel regions S15 and S16, , Floor side frame 22 is No. No. 4 connecting portion 29a and No. 4 cross member 29. The portions forming the regions S15 and S16 are bent at the connecting portions 30a with the five cross members 30 so as to be linear.

Next, the function and effect of the reinforcing beads 73 provided in each high-rigidity portion 70 will be described.
First, in the panel regions S1 and S5, S4, and S8, the high rigidity portion 70 includes two panel regions S1, S5, S4, and S8 so as to extend from the front side of the vehicle body to the rear side of the vehicle body. Since the plurality of reinforcing beads 73 extending in the direction are formed, the rigidity of the high rigidity portion 70 in the longitudinal direction of the vehicle body can be greatly increased in addition to increasing the rigidity by contacting the high rigidity portion 70 with the bent portion 52. . As a result, it is possible to further increase the rigidity difference between the low-rigidity portion 62 extending around the vehicle body front side and the vehicle body high school side. Therefore, for example, even in the range indicated by E1 in FIG. 7 and FIG. 9 described above, vibration energy can be concentrated even more particularly in the range indicated by F in the figure.

  Further, in the panel regions S3 and S7, a plurality of reinforcing beads 73 extending in the vehicle width direction are formed in the high rigidity portion 70 so as to cover the two low rigidity portions 62 extending linearly. In addition to increasing the rigidity by bringing the portion 70 into contact with the bent portion 52, the rigidity of the high-rigidity portion 70 in the vehicle width direction is greatly increased. As a result, the rigidity difference between the high-rigidity portion 70 and the two low-rigidity portions 62 extending linearly can be further increased.

  In the panel region S11, the high rigidity portion 70 is in contact with the high rigidity portion 70. Since the plurality of reinforcing beads 73 extending radially from the side of the four cross members 29 and the bent portion 54 toward the low-rigidity portion 62 are formed, the rigidity in the direction in which the reinforcing beads 73 extend greatly increases. Since these reinforcing beads 73 extend toward almost the entire range of the L-shaped portion of the low-rigidity portion 62, the rigidity of the high-rigidity portion 70 and the portion of the low-rigidity portion 62 that extends in the L-shape. The difference can be made larger.

In the panel regions S15 and S16, the high rigidity portion 70 is in contact with the high rigidity portion 70. A plurality of reinforcing beads 73 extending from the cross member 30 side toward the low rigidity portion 62 side are formed. Specifically, the reinforcing beads 73 formed in the panel region S15 are No. 5 Since the vehicle extends in the longitudinal direction from the side in contact with the cross member 30 to the side facing the low-rigidity portion 62, the rigidity in the longitudinal direction of the high-rigidity portion 70 is greatly increased. The reinforcing beads 73 formed in the panel region S16 are No. 5 Since it extends radially from the middle part of the side in contact with the cross member 30 toward the remaining three sides on the low-rigidity part 62 side, the rigidity of the high-rigidity part 70 increases in the direction in which these reinforcing beads 73 extend. Rise.
As a result, in the panel area S15, in particular, No. The rigidity difference with the portion of the low-rigidity portion 62 that extends around the side on the rear side of the vehicle body that faces the side that contacts the 5 cross member 30 can be further increased, for example, in the range indicated by E in FIG. In particular, vibration energy can be concentrated more in a range as indicated by F in the figure.
Further, in the panel region S16, the plurality of reinforcing beads 73 extend toward almost the entire range of the portion of the low-rigidity portion 62 that extends in a U-shape. Therefore, the high-rigidity portion 70 and its U-shape. The rigidity difference from the portion of the low-rigidity portion 62 extending in the direction can be increased.

Note that, as shown in FIGS. 12A and 12B, even when the frame member 53 is provided at the position of the folded portion 52 formed in the first floor panel 2, the high-rigidity portion 70 is As described above, it may be provided so as to be in contact with the frame member 53, and in these cases, the same operation as described above can be obtained.
Further, as shown in FIG. 12, the high-rigidity portion 70 formed over two regions may be formed so as to extend to substantially the center of each region. In this case, as described in the first embodiment, the high-rigidity portion 70 extends almost to the center of the panel region having a relatively low rigidity, so that the difference in rigidity from the surrounding low-rigidity portion 62 is further increased. I can do it. Note that the high-rigidity portion 70 may be formed so as to extend substantially to the center only in one region.

Next, the floor panel structure of the vehicle body of the third embodiment will be specifically described with reference to FIGS. In the third embodiment, a high-rigidity portion and a low-rigidity portion are provided as vibration reduction structures in the panel areas S9 and S12, respectively, and the shape and arrangement of the high-rigidity parts corresponding to the shapes of these panel areas ensure reliable vibration reduction effects. It is intended to be obtained. Here, the configuration and shape of the panel regions S9 and S12 and the basic shape and arrangement of the vibration reduction structure are the same, so the description will focus on the panel region S9.
FIG. 13: is an enlarged plan view (a) which shows panel region S9 by 3rd Embodiment of this invention, and sectional drawing (b) which shows the cross-sectional structure of the vehicle area direction of panel region S9 seen along the XIII-XIII line ).

As shown in FIGS. 1 and 13A, the panel region S9 (S12) includes the side sill 20, which is a frame member, as described above. 3 cross member 28 and No. 3 The four cross members 29 and the bead portion 56 formed along the curved portion 22 a of the floor side frame 22 are formed to be surrounded.
In this panel area S9 (S12), no. 3 cross member 28 and no. The four cross members 29 extend linearly in parallel with each other, and the bead portion 56 that is a vibration restricting portion extends linearly. Further, as described above, the side sill 20 is No. 3 cross member 28 and No. 3 No. 4 from almost the middle position of the cross member 29. The four cross members 29 are curved, and the curved portion forms two sides of the region S9 (S12) as substantially rectangular regions each including the curved portion 20a.

In the panel region S9 (S12), a circular first high-rigidity portion 80 arranged at substantially the center of the region S9 (S12), two circular second high-rigidity portions 81, and these two A flat portion 83 provided between the second high-rigidity portions 81 and a low-rigidity portion 62 extending around the first and second high-rigidity portions 80 and 81 are formed.
Here, the curved portion 20a has the smallest radius of curvature at two locations indicated by K in FIG. 13, and the two second high-rigidity portions 81 both have the locations K and the smallest radius of curvature. 1 between the high-rigidity portion 80. The two second high-rigidity portions 81 have an area smaller than that of the first high-rigidity portion 80, and are formed in the vicinity (including the case of contact) of the curved portion 20a. In the present embodiment, these second high-rigidity portions 81 are in contact with the curved portion 20 a and also in contact with the first high-rigidity portion 80. Note that these second high-rigidity portions 81 may be slightly apart without contacting the curved portion 20a as long as they are in the vicinity of the curved portion 20a, and the first high-rigidity portion 80 is located in the vicinity of each other. You may be a little far away.

  As shown in FIG. 13 (b), the first and second high-rigidity portions 80 and 81 are each formed by projecting the floor panel itself above the vehicle body, and the cross-sectional shape of the dome has a curved surface height that continuously changes. It has a shape. On the other hand, the low-rigidity portion 62 is formed almost flat, and the damping material 68 is attached to the entire area in the same manner as the panel region S2 of the first embodiment described above.

Next, the effect of the floor panel structure of 3rd Embodiment is demonstrated.
In the panel regions S9 and S12 of the floor panel structure of the present embodiment, as in the first embodiment, the high-rigidity parts 80 and 81 and the low-rigidity part 62 formed around the high-rigidity parts 80 and 81 The vibration energy concentrates on the low rigidity portion 62 due to the difference in rigidity.

  Furthermore, among the high-rigidity parts 80 and 81, the high-rigidity part 81 is provided at least in the vicinity (including the case of contact) of the curved part 20a on the sides of the panel regions S9 and S12. The difference in rigidity from the low rigidity portion 62 can be increased. That is, when the curved region 20a is included in the panel regions S9 and S12 by the frame member forming the panel region, the rigidity of the portion of the panel region in the vicinity of the curved portion is originally increased. The rigidity of the rigid portion 81 can be greatly increased.

  Therefore, the vibration energy is largely concentrated on the low rigidity portion 62, and the vibration energy is converted into heat energy by the damping ability of the steel plate constituting the floor panel, so that the vibration energy of the entire panel region is reduced. As a result, acoustic radiation from the panel area is reduced.

  Further, as in the first embodiment, a damping material 68 is provided in the low-rigidity portion 62, and the rigidity of both the damping material 68 and the low-rigidity portion 62 is lower than that of the high-rigidity portions 80 and 81. Therefore, the vibration energy concentrated on the low-rigidity portion 62 can be greatly reduced.

Next, the shape and arrangement of the high-rigidity parts 80 and 81 and the function and effect of the low-rigidity part 62 provided around the high-rigidity parts 80 and 81 will be described.
In the panel regions S9 and S12 of the present embodiment, the high-rigidity portions 80 and 81 are formed so as to extend from the vicinity of the curved portion 20a to the substantially central portion, so that the rigidity is as described above in the first embodiment. The high-rigidity portions 80 and 81 extend almost to the center of the relatively low panel area, and the vibration can be more reliably concentrated on the low-rigidity portion 62 around the high-rigidity portions 80 and 81 and the difference in stiffness can be further increased. It can be enlarged. As a result, vibration energy can be largely concentrated in the portion of the low rigidity portion 62 extending around the high rigidity portions 80 and 81, and vibration energy can be concentrated particularly greatly in the range indicated by E in FIG. .

  Further, since the second high-rigidity portion 81 is formed in a circular shape and in the vicinity of the curved portion 20a, the gap between the second high-rigidity portion 81 and the curved portion 20a is indicated by G1 in FIG. Such a gap is formed. The gap G1 can prevent the rigidity of the portion in the vicinity of the gap G1 from increasing in the low rigidity part 62 formed around each of the high rigidity parts 80 and 81. Specifically, it is possible to prevent the rigidity in the range as indicated by X in FIG. 13 from increasing. As a result, the range of E in the figure where the vibration energy is concentrated is not so narrowed, and the vibration reduction effect can be surely exhibited.

  Similarly, since the first high-rigidity portion 80 and the second high-rigidity portion 81 are each formed in a circular shape and are in contact with each other, the first high-rigidity portion 80 and the second high-rigidity portion 81 are in contact with each other. A gap G2 is formed in the gap. The gap G2 can prevent an increase in the rigidity of the portion in the vicinity thereof, and can further prevent the rigidity in the range indicated by X in the figure along with the gap G1 from increasing. As a result, the range of E in the figure where the vibration energy is concentrated is not so narrowed, and the vibration reduction effect can be surely exhibited.

In addition, since the area of the second high-rigidity portion 81 is smaller than the area of the first high-rigidity portion 80, the area of the low-rigidity portion 62 around the second high-rigidity portion 81 can be made relatively large. Specifically, the range of the low-rigidity portion 62 can be increased by the area of the range as indicated by G3 in FIG. And it is possible to prevent the rigidity of the low-rigidity portion 62 in the vicinity of the second high-rigidity portion 81 from being increased by this wide area, and as indicated by X in the figure along with the gaps G1 and G2. An increase in the rigidity of the range can be further prevented. As a result, the range of E in the figure where the vibration energy is concentrated is not so narrowed, and the vibration reduction effect can be surely exhibited.
Furthermore, since the first and second high-rigidity portions 80 and 81 are formed in a circular shape, the gap described above is provided between the second high-rigidity portion 81 and the curved portion 20a and between the high-rigidity portions 80 and 81. G1 and G2 can be easily formed, and the rigidity of each of the high-rigidity parts 80 and 81 can be greatly increased to make a difference in rigidity from the low-rigidity part 62.

  Each high-rigidity portion 80, 81 may be formed in an elliptical shape, and further, between the first and second high-rigidity portions 80, 81 or between the second high-rigidity portion 81 and the curved portion 20a. If the gap can be formed, it may be formed in a shape other than a circular shape or an elliptical shape, for example, a rectangular shape. In addition, even if the second high-rigidity portion 81 is in the vicinity of the curved portion 20a and is slightly apart without contacting the curved portion 20a, the above-described operational effects can be obtained, and the first and second high-rigidity portions 80 can be obtained. , 81 are formed a little apart so as to be located in the vicinity of each other, the above-described effects can be obtained.

  Next, two second high-rigidity portions 81 are provided, and a flat portion 83 is formed between the two second high-rigidity portions 81, so that the entire panel regions S9 and S12 are flat. Symmetrical vibrations are likely to occur at the boundary between the straight portion 83 and the substantially central portion of the regions S9 and S12. As a result, vibration energy can be effectively concentrated on the low rigidity portion 62.

  In addition, since the two second high-rigidity portions 81 are provided between the first high-rigidity portion 80 and the portion K having the smallest curvature radius of the curved portion 20a, the rigidity of the second high-rigidity portion 81 is provided. As a result, the difference in rigidity from the low rigidity portion 62 can be increased. That is, the smaller the radius of curvature of the curved portion 20a, the higher the rigidity of the portion of the panel region in the vicinity thereof. Therefore, by providing the second high rigidity portion 81 in this portion, the rigidity of the second high rigidity portion 81 is increased. Can be increased.

Next, the effect of the shape of the frame member and the vibration restricting portion forming each panel region will be described.
In the present embodiment, in the panel regions S9 and S12, except for the curved portion 20a of the side sill 20, the portions forming the panel region of the frame members 20, 28 and 29 and the bead portion 56 which is the vibration restricting portion extend linearly. Therefore, the rigidity of the low-rigidity part 62 can be prevented from increasing, and the difference in rigidity between the high-rigidity parts 80 and 81 and the low-rigidity part can be obtained more reliably. In particular, since the linear bead portion 56 that is the vibration restricting portion is formed along the curved portion 22a of the floor side frame 22 as in the panel region S10 described above, the overall rigidity of the panel regions S9 and S12 is reduced. It is possible to prevent the vibration reduction effect from increasing and decreasing.

Next, a modification of the third embodiment will be described with reference to FIGS.
First, as shown in FIG. 14, for example, when there is one portion K having the smallest radius of curvature of the curved portion 20a of the panel region S9, the two second high-rigidity portions 81 of the third embodiment described above. A flat portion 83 provided therebetween may be formed between the portion having the smallest curvature radius and the first high-rigidity portion 80.
In this case, the same action as described above can be obtained. In particular, since the flat portion 83 provided between the two second high-rigidity portions 81 is formed between the portion K having the smallest curvature radius and the first high-rigidity portion 80, this curvature radius. The first and second high-rigidity portions 80 and 81 and the flat portion 83 are arranged between the small portion K and the low-rigidity portion 62, thereby preventing the rigidity of the low-rigidity portion 62 from increasing. I can do it. As a result, vibration energy can be effectively concentrated on the low-rigidity portion 62 more reliably.

Next, as shown in FIG. 15, for example, when there is one portion K having the smallest curvature radius of the curved portion 20a of the panel region S9, the first portion K and the portion K having the smallest curvature radius of the curved portion 20a One second high-rigidity part 81 having an area smaller than that of the first high-rigidity part 80 may be provided between the high-rigidity part 80.
In this case, the same action as described above can be obtained. In particular, since the area of the second high-rigidity portion 81 is smaller than the area of the first high-rigidity portion 80, the low-rigidity portion 62 is expanded to both sides of the second high-rigidity portion 81, and the area of the low-rigidity portion is increased. Can be made relatively large. As a result, it is possible to prevent the rigidity of the portion of the low rigidity portion 62 in the vicinity of the second high rigidity portion 81 from increasing. In this modification, it is possible to prevent the rigidity in the range as indicated by X in FIG. 15 from increasing, and it is possible to prevent the range of E in FIG. 15 where vibration energy is concentrated from becoming too narrow.

Next, as shown in FIG. 16, one elliptical high-rigidity portion 85 that extends from the vicinity of the curved portion 20 a to the substantially central portion may be provided in the panel region S <b> 9. In this case, when one end portion in the longitudinal direction of the elliptical high-rigidity portion 85 is formed so as to be located in the vicinity (including the case of contact) of the curved portion 20a as described in the third embodiment. good. Moreover, it is good to form so that the one end part of the longitudinal direction of the elliptical highly rigid part 85 may be located in the vicinity of the part with the smallest curvature radius of the curved part 20a.
Also in this case, since the elliptical high-rigidity portion 85 is provided at least in the vicinity of the curved portion 20a on the sides of the panel regions S9 and S12, the same operation as described above can be obtained. In particular, since the high-rigidity portion 85 extends in an elliptical shape from the vicinity of the curved portion 20a to almost the center, the high-rigidity portion 85 and the curved portion 20a have an elliptical shape as indicated by G in FIG. A gap is formed, and as described above, it is possible to prevent the rigidity in the vicinity of the gap from being increased by such a gap. In this modification, it is possible to prevent the rigidity in the range indicated by X in FIG. 16 from increasing, and it is possible to prevent the range E in FIG. 16 where vibration energy is concentrated from becoming too narrow.

  Next, as shown in FIGS. 17A and 17B, for example, in the panel region S9 and the region S10, when a linear bead portion is not formed along the curved portion 22a of the floor side frame 22, One side of these panel regions S9 and S10 includes the curved portion 22a. Therefore, as shown in FIG. 17A, for example, one elliptical high-rigidity portion 85 may be provided in the panel region S9 as described above. Further, as shown in FIG. 17B, for example, the first high-rigidity portion 80 and the second high-rigidity portion 81 are provided in the panel region S10 from the vicinity of the curved portion 22a to the substantially central portion as described above. May be. Also in these cases, the same operation as that of the above-described third embodiment and the above-described modification can be obtained.

FIG. 5 is a perspective view showing an underbody of an automobile provided with a floor panel structure for a vehicle body according to first to third embodiments of the present invention. FIG. 4 is an enlarged plan view (a) showing a panel region S2 according to the first embodiment of the present invention and a sectional view (b) showing a cross-sectional structure in the vehicle width direction of the panel region S2 as seen along the line II-II. FIG. 4 is an enlarged plan view (a) showing a panel region S10 according to the first embodiment of the present invention and a sectional view (b) showing a cross-sectional structure in the vehicle body front-rear direction of the panel region S10 as viewed along the line III-III. FIG. 4 is an enlarged plan view (a) showing a panel region S13 according to the first embodiment of the present invention and a cross-sectional view (b) showing a cross-sectional structure in the vehicle body front-rear direction of the panel region S13 viewed along the line IV-IV. FIG. 5 is an enlarged plan view (a) showing a panel region S14 according to the first embodiment of the present invention and a sectional view (b) showing a cross-sectional structure of the panel region S14 in the longitudinal direction of the vehicle body viewed along the line VV. It is an enlarged plan view showing panel region S10 according to a modification of the first embodiment of the present invention. An enlarged plan view (a) showing the panel regions S1 and S5 according to the second embodiment of the present invention, and a sectional view showing a cross-sectional structure in the longitudinal direction of the vehicle body of the panel regions S1 and S5 viewed along the line VII-VII (b) ). An enlarged plan view (a) showing the panel regions S3 and S7 according to the second embodiment of the present invention, and a sectional view showing a cross-sectional structure in the vehicle body longitudinal direction of the panel regions S3 and S7 as seen along the line VIII-VIII (b) ). An enlarged plan view (a) showing the panel regions S4 and S8 according to the second embodiment of the present invention, and a sectional view showing a cross-sectional structure in the vehicle body longitudinal direction of the panel regions S4 and S8 viewed along the line IX-IX (b) ). FIG. 6 is an enlarged plan view (a) showing a panel region S11 according to a second embodiment of the present invention and a sectional view (b) showing a cross-sectional structure in the vehicle body front-rear direction of the panel region S11 viewed along the line XX. It is sectional drawing (b) which shows the cross-sectional structure of the vehicle body front-back direction of the panel area | region S15 seen along the XI-XI line and the enlarged plan view (a) which shows panel area | region S15 by 2nd Embodiment of this invention. It is the enlarged plan view (a) which shows panel area | region S1 and S5 by the modification of 2nd Embodiment of this invention, and the enlarged plan view (b) which shows panel area | region S4 and S8. It is sectional drawing (b) which shows the cross-sectional structure of the panel area | region S9 of the panel area | region S9 seen along the XIII-XIII line | wire and the enlarged plan view (a) which shows panel area | region S9 by 3rd Embodiment of this invention. It is an enlarged plan view which shows panel area | region S9 by the modification of 3rd Embodiment of this invention. It is an enlarged plan view which shows panel area | region S9 by the modification of 3rd Embodiment of this invention. It is an enlarged plan view which shows panel area | region S9 by the modification of 3rd Embodiment of this invention. It is the enlarged plan view (a) which shows panel area | region S9 by the modification of 3rd Embodiment of this invention, and the enlarged plan view (b) which shows panel area | region S10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underbody 2 of a motor vehicle 1st floor panel 4 2nd floor panel 6 3rd floor panel 18 Front side frame 20 Side sill 20a Curved part 22 of panel area | regions S9 and S12 Floor side frame 22a Curved part 22b Bent part 22c Bent part 22d Flange 22e Flange edge 24 Rear side frame 26 1 Cross member 27 2 Cross member 28 3 cross member 29 4 cross member 29a connecting portion 30 No. 4 5 cross member 30a connecting part 36 1 tunnel side member 37 No. 1 Two tunnel side members 40 Engine 42 Front suspension cross member 44 Front suspension 46 Rear suspension cross member 48 Rear suspension 50 Floor tunnel portions 52, 54 Folded portion (vibration restricting portion)
56, 58 Bead part (vibration restricting part)
60 High rigidity part 62 Low rigidity part 64 Bracket 66 Auxiliary machinery 68 Damping material 70 High rigidity part 73 High rigidity part reinforcement bead 74 Circular high rigidity part 76 Rectangular high rigidity part 80 First high rigidity part 81 Second high-rigidity portion 85 Elliptical high-rigidity portions S1 to S16 Panel region a Boundary portion between high-rigidity portion and low-rigidity portion

Claims (16)

A floor panel structure of a vehicle body constituting a floor of an automobile by floor panels connected to a plurality of frame members arranged in the vehicle longitudinal direction and the vehicle width direction and connected to an engine or suspension,
In the floor panel, a panel region surrounded by the frame member or a vibration restricting portion that restricts the frame member and the vibration region is formed,
In the panel region of the floor panel, a high-rigidity portion that protrudes upward or downward is formed, and a low-rigidity portion is formed substantially flat around the high-rigidity portion,
A part of the high-rigidity part is formed so as to contact the frame member and / or the vibration restricting part ,
A floor panel structure for a vehicle body , wherein a damping material is provided only in the entire region of the low-rigidity portion in the panel region of the floor panel.   The floor panel structure for a vehicle body according to claim 1, wherein the high-rigidity portion is formed in a substantially rectangular shape, and all or part of one side thereof is in contact with the frame member or the vibration regulating portion.   The floor panel structure for a vehicle body according to claim 2, wherein the low-rigidity portion includes a U-shaped portion extending around the high-rigidity portion, and the portion extends with a predetermined width so as not to increase its rigidity.   The floor panel structure for a vehicle body according to claim 1, wherein the high-rigidity portion is formed in a substantially rectangular shape, and all or a part of each of the two adjacent sides is in contact with the frame member or the vibration restricting portion.   The floor panel structure for a vehicle body according to claim 4, wherein the low-rigidity portion includes a portion extending in an L shape around the high-rigidity portion, and this portion extends with a predetermined width so as not to increase its rigidity.   The floor panel structure for a vehicle body according to any one of claims 2 to 5, wherein the high-rigidity portion extends from a portion in contact with the frame member and / or the vibration restricting portion to a substantially central portion of the panel region.   The vehicle body according to any one of claims 2 to 6, wherein the substantially rectangular high-rigidity portion extends in a curved shape at the contacted side, and is in contact with the frame member or the vibration restricting portion at a substantially middle portion of the side. Floor panel structure. The panel region is formed by sharing one frame member of the frame member or the vibration restricting portion,
The vehicle body floor panel structure according to claim 1, wherein the high-rigidity portion is in contact with the shared frame member and formed over the two panel regions. The panel region is formed by sharing one vibration regulating part among the frame member or the vibration regulating part,
This shared vibration restricting portion is a fold portion formed by bending the floor panel in a straight line,
The vehicle body floor panel structure according to claim 1, wherein the high-rigidity portion is formed over the two panel regions in contact with the bent portion.   The high-rigidity portion is formed in a substantially rectangular shape and is disposed at a substantially middle portion of the shared frame member or vibration restricting portion, and the low-rigidity portion is provided with the high-rigidity portion in each of the two panel regions. The floor panel structure for a vehicle body according to claim 8 or 9, including a U-shaped portion extending around the portion, and the portion extending with a predetermined width so as not to increase its rigidity.   The high-rigidity portion is formed in a substantially rectangular shape and disposed at an end of the shared frame member or vibration restricting portion, and the low-rigidity portion is the high-rigidity portion in each of the two panel regions. 10. The vehicle body floor panel structure according to claim 8 or 9, comprising a portion extending in an L shape around said portion, and this portion extends by a predetermined width so as not to increase its rigidity.   The high-rigidity part extends from the part in contact with the frame member or the vibration restricting part to a substantially central part in one or both of the two panel regions. The floor panel structure of the car body.   8. The reinforcing bead extending from the side of the contacting frame member and / or the vibration restricting portion toward the low rigid portion is formed in the high rigidity portion. The vehicle body floor panel structure described.   The floor panel structure for a vehicle body according to any one of claims 8 to 12, wherein a reinforcing bead extending over the two panel regions is formed in the high-rigidity portion.   The floor panel structure for a vehicle body according to any one of claims 1 to 14, wherein the high-rigidity portion is in contact with a frame member having a smaller amount of vibration transmission from the engine or suspension among the plurality of frame members. The frame member includes a side frame extending in the longitudinal direction of the vehicle body and a plurality of cross members connected to the side frame via a connecting portion and extending in the vehicle width direction,
Among the plurality of cross members, a predetermined cross member has a connection portion whose connection rigidity is relatively lower than other cross members, and the high rigidity portion is in contact with the predetermined cross member. 16. A vehicle body floor panel structure according to any one of 1 to 15.

Images